Azure99/stackoverflow-qa-top-300k · Datasets at Hugging Face

20,018,507

Angular JS: What is the need of the directive’s link function when we already had directive’s controller with scope?

I need to perform some operations on scope and the template. It seems that I can do that in either the <code>link</code> function or the <code>controller</code> function (since both have access to the scope). When is it the case when I have to use <code>link</code> function and not the controller? <pre><code>angular.module('myApp').directive('abc', function($timeout) { return { restrict: 'EA', replace: true, transclude: true, scope: true, link: function(scope, elem, attr) { /* link function */ }, controller: function($scope, $element) { /* controller function */ } }; } </code></pre> Also, I understand that <code>link</code> is the non-angular world. So, I can use <code>$watch</code>, <code>$digest</code> and <code>$apply</code>. What is the significance of the <code>link</code> function, when we already had controller?

23,722,351

3

2

null

2013-11-16 12:34:11.733 UTC

157

2020-01-30 07:26:46.343 UTC

2017-09-17 05:24:53.783 UTC

null

731,963

null

731,963

null

1

211

javascript|angularjs|angularjs-directive

168,605

After my initial struggle with the <code>link</code> and <code>controller</code> functions and reading quite a lot about them, I think now I have the answer. First lets understand, How do angular directives work in a nutshell: <ul> <li>We begin with a template (as a string or loaded to a string) <code>var templateString = '<div my-directive>{{5 + 10}}</div>';</code></li> <li>Now, this <code>templateString</code> is wrapped as an angular element <code>var el = angular.element(templateString);</code></li> <li>With <code>el</code>, now we compile it with <code>$compile</code> to get back the link function. <code>var l = $compile(el)</code> Here is what happens, <ul> <li><code>$compile</code> walks through the whole template and collects all the directives that it recognizes.</li> <li>All the directives that are discovered are compiled recursively and their <code>link</code> functions are collected.</li> <li>Then, all the <code>link</code> functions are wrapped in a new <code>link</code> function and returned as <code>l</code>.</li> </ul></li> <li>Finally, we provide <code>scope</code> function to this <code>l</code> (link) function which further executes the wrapped link functions with this <code>scope</code> and their corresponding elements. <code>l(scope)</code></li> <li>This adds the <code>template</code> as a new node to the <code>DOM</code> and invokes <code>controller</code> which adds its watches to the scope which is shared with the template in DOM.</li> </ul> <img src="https://i.stack.imgur.com/0PwGA.png" alt="enter image description here"> Comparing compile vs link vs controller : <ul> <li>Every directive is compiled only once and link function is retained for re-use. Therefore, if there's something applicable to all instances of a directive should be performed inside directive's <code>compile</code> function.</li> <li>Now, after compilation we have <code>link</code> function which is executed while attaching the template to the DOM. So, therefore we perform everything that is specific to every instance of the directive. For eg: attaching events, mutating the template based on scope, etc.</li> <li>Finally, the controller is meant to be available to be live and reactive while the directive works on the <code>DOM</code> (after getting attached). Therefore: (1) After setting up the view[V] (i.e. template) with link. <code>$scope</code> is our [M] and <code>$controller</code> is our [C] in M V C (2) Take advantage the 2-way binding with $scope by setting up watches. (3) <code>$scope</code> watches are expected to be added in the controller since this is what is watching the template during run-time. (4) Finally, <code>controller</code> is also used to be able to communicate among related directives. (Like <code>myTabs</code> example in <a href="https://docs.angularjs.org/guide/directive" rel="noreferrer">https://docs.angularjs.org/guide/directive</a>) (5) It's true that we could've done all this in the <code>link</code> function as well but its about separation of concerns.</li> </ul> Therefore, finally we have the following which fits all the pieces perfectly : <img src="https://i.stack.imgur.com/SAFpN.png" alt="enter image description here">

20,159,457

Bluetooth audio streaming between android devices

I made a research on the same topic and found that android devices are a2dp sources and the audio can be streamed only from an a2dp source to an a2dp sink. A2dp sink can be a bluetooth headset or a bluetooth speaker. But my question is then how the android app named "<a href="https://play.google.com/store/apps/details?id=com.ilumnis.btplayerfree&hl=en">Bluetooth Music Player</a>" works? It allows streaming from one mobile to another. So in this case the listening mobile device must act as a sink. How this is possible? Are they using some other profile instead of a2dp? Ok, that may be a different profile what they are using. Because the application needs to be installed in the client side also. But how it becomes possible to stream voice from a bluetooth microphone to an android device? Please help.

20,222,491

1

3

null

2013-11-23 06:40:55.883 UTC

14

2015-10-31 12:39:48.937 UTC

2013-11-26 15:37:46.913 UTC

null

2,441,654

null

2,441,654

null

1

18

android|bluetooth|streaming|audio-streaming|a2dp

40,531

Without knowing details about the mentioned Bluetooth Music Player, it seems to use simple Bluetooth data connection, otherwise you would not need to install a client on playing/sending device. To stream audio from microphone to another device, you can record it on your sending device and send it to the receiving device. You will need to implement a protocol for that purpose. OR You can implement an alternative A2DP sink service. This is, what the sink is: a device with a Bluetooth Protocol Stack with an implementation of A2DP Sink. Edit: For the case you detailed by your comments, the sending device should be left as-is, without installing any app. That implicitly means that your solution must make use of out-of-the-box Bluetooth functionality of that Android device. What you can use here is therefor limited to those profiles that Android typically support, which is HSP, HFP and A2DP. Since you obviously want to stream music, A2DP would be your choice. On the device supposed to receive the audio stream and do the playback, you have to implement a service providing the A2DP sink as an self implemented BluetoothService opening a BluetoothServerSocket on RFCOMM as described in <a href="http://developer.android.com/reference/android/bluetooth/BluetoothServerSocket.html" rel="noreferrer">Android documentation</a>. You will have to spend much effort implementing this, and I am not sure if you will need a license for this.

27,633,584

php - Fatal error: Call to undefined function mcrypt_get_iv_size() in AppServ

I found a problem when I use mcrypt_get_iv_size function via <a href="https://www.appserv.org/" rel="noreferrer">AppServ</a>. I try to find a topic that related to solved a problem. However, I try yo download libmcrypt.dll into symtem32 and edit php.ini by removing a comment from <code>;extension=php_mcrypt.dll</code> to <code>extension=php_mcrypt.dll</code>. Then restart apache. Unfortunately, after reload a page to see a result after modify. It still error as <blockquote> Fatal error: Call to undefined function mcrypt_get_iv_size() in C:\AppServ\www\folder\index.php on line 36 </blockquote> A function contains following: <pre><code>class Encryption { var $skey = "SuPerEncKey2010"; // you can change it public function safe_b64encode($string) { $data = base64_encode($string); $data = str_replace(array('+','/','='),array('-','_',''),$data); return $data; } public function safe_b64decode($string) { $data = str_replace(array('-','_'),array('+','/'),$string); $mod4 = strlen($data) % 4; if ($mod4) { $data .= substr('====', $mod4); } return base64_decode($data); } public function encode($value){ if(!$value){return false;} $text = $value; $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv); return trim($this->safe_b64encode($crypttext)); } public function decode($value){ if(!$value){return false;} $crypttext = $this->safe_b64decode($value); $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv); return strtolower(trim($decrypttext)); } } </code></pre>

48,150,309

4

5

null

2014-12-24 08:02:21.367 UTC

null

2019-04-28 21:09:58.89 UTC

2017-06-14 08:31:55.677 UTC

null

540,812

null

2,971,638

null

1

27

php|appserver

51,282

in case of php-7: <blockquote> sudo apt-get install mcrypt php7.1-mcrypt </blockquote>

59,697,071

What is the (...) called in C and C++?

One of the uses of <code>...</code> is to denote variadic entities in C and C++. What is its name? Is it classified as an operator or something else when used in that way? Any other details regarding <code>...</code>? Edit: I know the purpose of <code>...</code>. I am asking about its name and classification, which I hope, is similar in both C and C++.

59,697,523

4

3

null

2020-01-11 17:49:05.543 UTC

11

2022-08-20 13:45:40.537 UTC

2020-02-01 17:03:08.99 UTC

null

12,139,179

null

10,251,345

null

1

31

c++|c|terminology|ellipsis|variadic

4,593

It is one of the punctuators. <blockquote> <pre class="lang-text prettyprint-override"><code>6.4.6 Punctuators Syntax punctuator: one of [ ] ( ) { } . -> ++ -- & * + - ~ ! / % << >> < > <= >= == != ^ | && || ? : ; ... = *= /= %= += -= <<= >>= &= ^= |= , # ## <: :> <% %> %: %:%: </code></pre> </blockquote> In the function declaration it is called the ellipsis. <hr /> Ellipsis is also used by some compiler <code>C</code> language extensions. Example - gcc switch/case range extension <pre><code>const char *test(unsigned num) { switch(num) { case 0 ... 9: return "the value is in the 0 to 9 range"; case 10 ... 99: return "the value is in the 10 to 99 range"; default: return "out of tested range"; } } </code></pre> <a href="https://godbolt.org/z/YBLma-" rel="nofollow noreferrer">https://godbolt.org/z/YBLma-</a>

15,254,538

standard way to handle user session in tornado

So, in order to avoid the "no one best answer" problem, I'm going to ask, not for the best way, but the standard or most common way to handle sessions when using the Tornado framework. That is, if we're not using 3rd party authentication (OAuth, etc.), but rather we have want to have our own Users table with secure cookies in the browser but most of the session info stored on the server, what is the most common way of doing this? I have seen some people using Redis, some people using their normal database (MySQL or Postgres or whatever), some people using memcached. The application I'm working on won't have millions of users at a time, or probably even thousands. It will need to eventually get some moderately complex authorization scheme, though. What I'm looking for is to make sure we don't do something "weird" that goes down a different path than the general Tornado community, since authentication and authorization, while it is something we need, isn't something that is at the core of our product and so isn't where we should be differentiating ourselves. So, we're looking for what most people (who use Tornado) are doing in this respect, hence I think it's a question with (in theory) an objectively true answer. The ideal answer would point to example code, of course.

15,265,556

4

0

null

2013-03-06 17:55:38.937 UTC

8

2016-03-10 14:04:26.587 UTC

2013-03-07 07:38:55.747 UTC

null

656,804

null

155,946

null

1

14

python|tornado

14,885

Tornado designed to be stateless and don't have session support out of the box. Use secure cookies to store sensitive information like user_id. Use standard cookies to store not critical information. For storing large objects - use standard scheme - MySQL + memcache.

38,354,595

java code execution yields to different results in debug without breakpoints and normal run. Is ExecutorService broken?

TL:DR <code>ExecutorService executorService = Executors.newFixedThreadPool(8);</code> in debug runs concurrent, but in normal runtime it starts concurrent, but later runs in single thread. I have some code where I start 4 different tasks in <code>ExecutorService</code>. Two of those tasks should finish almost instantly, the other two should run for a while. Those tasks return execution time in seconds in <code>Future<Double></code>. This code is responsible for task execution and measurement: <pre><code>public Future<Double> measure(int[] arr, ProcessIntArray processIntArray, ExecutorService es) { Callable<Double> task = () -> { long start = System.nanoTime(); processIntArray.process(arr); long end = System.nanoTime(); return (end - start) / 1000000000.0; }; return es.submit(task); } </code></pre> Later on, after starting those tasks, I print them in the order of execution time from previous runs for the same input size. <pre><code> Future<Double> bubbleSortTime = measure(bubbleSortArray, Solution::bubbleSort, executorService); Future<Double> insertionSortTime = measure(insertionSortArray, Solution::insertionSort, executorService); Future<Double> quickSortTime = measure(quickSortArray, Solution::quickSort, executorService); Future<Double> mergeSortTime = measure(mergeSortArray, Solution::mergeSort, executorService); System.out.println(); System.out.println("array size: " + size); System.out.println("quick sort: " + quickSortTime.get() + "s"); System.out.println("merge sort: " + mergeSortTime.get() + "s"); System.out.println("insertion sort: " + insertionSortTime.get() + "s"); System.out.println("bubble sort: " + bubbleSortTime.get() + "s"); </code></pre> When I run code in debug mode, 2 results are printed immidiately, and I have to wait a while for 3rd result (I do not bother waiting for the 4th one). After starting in debug (correct and expected): <code>array size: 1000000 quick sort: 0.186892839s merge sort: 0.291950604s insertion sort: 344.534256723s</code> Normal execution differs, It looks like in method measure <code>long start = System.nanoTime();</code> is executed, then thread falls asleep, and after insertionSort is done, quickSort is back in execution, which yields to output: <code>array size: 1000000 quick sort: 345.893922141s merge sort: 345.944023095s insertion sort: 345.871908569s</code> Which is wrong. All of those threads should be running at the same time, as from newFixedThreadPool javadoc. <pre><code>/** * Creates a thread pool that reuses a fixed number of threads * operating off a shared unbounded queue. At any point, at most * {@code nThreads} threads will be active processing tasks. * If additional tasks are submitted when all threads are active, * they will wait in the queue until a thread is available. * If any thread terminates due to a failure during execution * prior to shutdown, a new one will take its place if needed to * execute subsequent tasks. The threads in the pool will exist * until it is explicitly {@link ExecutorService#shutdown shutdown}. * * @param nThreads the number of threads in the pool * @return the newly created thread pool * @throws IllegalArgumentException if {@code nThreads <= 0} */ public static ExecutorService newFixedThreadPool(int nThreads) </code></pre> I attach source code: <pre><code>import java.util.Arrays; import java.util.Random; import java.util.concurrent.*; class ThreadedSortingComparsion { Random random = new Random(System.currentTimeMillis()); void popul(int[] array) { for (int i = 0; i < array.length; i++) { array[i] = random.nextInt(); } } interface ArraySorter { void sort(int[] array); } public Future<Double> measureTime(int[] array, ArraySorter arraySorter, ExecutorService executorService) { Callable<Double> task = () -> { long start = System.nanoTime(); arraySorter.sort(array); long end = System.nanoTime(); return (end - start) / 1000000000.0; }; return executorService.submit(task); } public void start() throws ExecutionException, InterruptedException { ExecutorService executorService = Executors.newFixedThreadPool(8); int size = 1000 * 1000; int[] quickSortArray = new int[size]; popul(quickSortArray); int[] bubbleSortArray = Arrays.copyOf(quickSortArray, quickSortArray.length); int[] mergeSortArray = Arrays.copyOf(quickSortArray, quickSortArray.length); int[] originalArray = Arrays.copyOf(quickSortArray, quickSortArray.length); int[] insertionSortArray = Arrays.copyOf(quickSortArray, quickSortArray.length); Future<Double> bubbleSortTime = measureTime(bubbleSortArray, ThreadedSortingComparsion::bubbleSort, executorService); Future<Double> insertionSortTime = measureTime(insertionSortArray, ThreadedSortingComparsion::insertionSort, executorService); Future<Double> quickSortTime = measureTime(quickSortArray, ThreadedSortingComparsion::quickSort, executorService); Future<Double> mergeSortTime = measureTime(mergeSortArray, ThreadedSortingComparsion::mergeSort, executorService); System.out.println(); System.out.println("array size: " + size); System.out.println("quick sort: " + quickSortTime.get() + "s"); System.out.println("merge sort: " + mergeSortTime.get() + "s"); System.out.println("insertion sort: " + insertionSortTime.get() + "s"); System.out.println("bubble sort: " + bubbleSortTime.get() + "s"); executorService.shutdown(); for (int i = 0; i < quickSortArray.length; i++) { if (quickSortArray[i] != bubbleSortArray[i] || quickSortArray[i] != mergeSortArray[i] || quickSortArray[i] != insertionSortArray[i]) { throw new RuntimeException(Arrays.toString(originalArray)); } } } public static void mergeSort(int[] ar) { if (ar.length < 5) { bubbleSort(ar); return; } int middle = ar.length / 2; int[] arrayLeft = new int[middle]; int[] arrayRight = new int[ar.length - middle]; for (int i = 0; i < ar.length; i++) { if (i < middle) { arrayLeft[i] = ar[i]; } else { arrayRight[i - middle] = ar[i]; } } mergeSort(arrayLeft); mergeSort(arrayRight); int indexLeft = 0; int indexRight = 0; int inputArrayIndex = 0; while (true) { int whatToPutInAR = 0; if (indexLeft != arrayLeft.length && indexRight != arrayRight.length) { if (arrayLeft[indexLeft] < arrayRight[indexRight]) { whatToPutInAR = arrayLeft[indexLeft]; indexLeft++; } else { whatToPutInAR = arrayRight[indexRight]; indexRight++; } } else if (indexLeft != arrayLeft.length) { whatToPutInAR = arrayLeft[indexLeft]; indexLeft++; } else if (indexRight != arrayRight.length) { whatToPutInAR = arrayRight[indexRight]; indexRight++; } if (inputArrayIndex == ar.length) return; ar[inputArrayIndex++] = whatToPutInAR; } } private static void quickSort(int[] ar) { quickSort(ar, 0, ar.length); } static public void quickSort(int[] array, int start, int end) { boolean changed = false; if (end == 0) return; int pivot = array[end - 1]; int partitionCandidate = start; for (int i = start; i < end; i++) { if (array[i] < pivot) { swap(array, partitionCandidate++, i); changed = true; } else if (pivot < array[i]) { swap(array, end - 1, i); changed = true; } } if (start < partitionCandidate) { quickSort(array, start, partitionCandidate); } if (partitionCandidate < end) { if (partitionCandidate != start || changed) quickSort(array, partitionCandidate, end); } } public static void swap(int[] ar, int from, int to) { int old = ar[from]; ar[from] = ar[to]; ar[to] = old; } public static void bubbleSort(int[] array) { for (int i = 0; i < array.length; i++) { for (int j = 0; j < array.length - 1; j++) { if (array[j] > array[j + 1]) { swap(array, j + 1, j); } } } } private static void insertionSort(int[] ar) { for (int i = 0; i < ar.length; i++) { for (int j = i; j >= 1; j--) { boolean breaker = true; if (ar[j] < ar[j - 1]) { breaker = false; swap(ar, j - 1, j); } if (breaker) break; } } } public static void main(String[] args) throws ExecutionException, InterruptedException { ThreadedSortingComparsion s = new ThreadedSortingComparsion(); s.start(); } } </code></pre> Edit: when I run it in Ideone, the code works fine. <a href="http://ideone.com/1E8C51" rel="noreferrer">http://ideone.com/1E8C51</a> Ideone has java version <code>1.8.0_51</code> I tested in on <code>1.8.0_91</code>, <code>1.8.0_92</code>. And <code>1.8.0_45</code>. Why does it work on ideone, but not on 2 other PC's I tested? When I do thread dump, while executing not in the debug, then I wait a while, and after thread dump is printed, also results are printed. So the thread dump is done after finishing insertion sort. <pre><code>"C:\Program Files\Java\jdk1.8.0_45\bin\java" -Xmx8G -Xss1G -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.1.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_45\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_45\jre\lib\rt.jar;C:\Users\Tomasz_Mielczarski\IdeaProjects\untitled\out\production\untitled;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 2016.1.3\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain ThreadedSortingComparsion array size: 1000000 2016-07-15 13:45:22 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.45-b02 mixed mode): "pool-1-thread-4" #15 prio=5 os_prio=0 tid=0x00000000696bd000 nid=0x560 runnable [0x00000002fffee000] java.lang.Thread.State: RUNNABLE at ThreadedSortingComparsion.mergeSort(ThreadedSortingComparsion.java:77) at ThreadedSortingComparsion.mergeSort(ThreadedSortingComparsion.java:78) at ThreadedSortingComparsion.mergeSort(ThreadedSortingComparsion.java:78) at ThreadedSortingComparsion.mergeSort(ThreadedSortingComparsion.java:78) at ThreadedSortingComparsion.mergeSort(ThreadedSortingComparsion.java:77) at ThreadedSortingComparsion$$Lambda$5/81628611.sort(Unknown Source) at ThreadedSortingComparsion.lambda$measureTime$0(ThreadedSortingComparsion.java:21) at ThreadedSortingComparsion$$Lambda$2/1023892928.call(Unknown Source) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) "pool-1-thread-3" #14 prio=5 os_prio=0 tid=0x00000000696bb800 nid=0x2634 runnable [0x00000002bffee000] java.lang.Thread.State: RUNNABLE at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:123) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:126) at ThreadedSortingComparsion.quickSort(ThreadedSortingComparsion.java:105) at ThreadedSortingComparsion$$Lambda$4/1989780873.sort(Unknown Source) at ThreadedSortingComparsion.lambda$measureTime$0(ThreadedSortingComparsion.java:21) at ThreadedSortingComparsion$$Lambda$2/1023892928.call(Unknown Source) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) "pool-1-thread-2" #13 prio=5 os_prio=0 tid=0x00000000696b7800 nid=0x1c70 waiting on condition [0x000000027ffef000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000719d72480> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) "pool-1-thread-1" #12 prio=5 os_prio=0 tid=0x00000000696b6800 nid=0x478 runnable [0x000000023ffee000] java.lang.Thread.State: RUNNABLE at ThreadedSortingComparsion.bubbleSort(ThreadedSortingComparsion.java:139) at ThreadedSortingComparsion$$Lambda$1/990368553.sort(Unknown Source) at ThreadedSortingComparsion.lambda$measureTime$0(ThreadedSortingComparsion.java:21) at ThreadedSortingComparsion$$Lambda$2/1023892928.call(Unknown Source) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) "Monitor Ctrl-Break" #11 daemon prio=5 os_prio=0 tid=0x0000000068d3d000 nid=0x2f3c runnable [0x00000001fffee000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.socketRead(SocketInputStream.java:116) at java.net.SocketInputStream.read(SocketInputStream.java:170) at java.net.SocketInputStream.read(SocketInputStream.java:141) at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284) at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326) at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178) - locked <0x00000007156892b8> (a java.io.InputStreamReader) at java.io.InputStreamReader.read(InputStreamReader.java:184) at java.io.BufferedReader.fill(BufferedReader.java:161) at java.io.BufferedReader.readLine(BufferedReader.java:324) - locked <0x00000007156892b8> (a java.io.InputStreamReader) at java.io.BufferedReader.readLine(BufferedReader.java:389) at com.intellij.rt.execution.application.AppMain$1.run(AppMain.java:93) at java.lang.Thread.run(Thread.java:745) "Service Thread" #10 daemon prio=9 os_prio=0 tid=0x0000000068c81000 nid=0x2d6c runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread3" #9 daemon prio=9 os_prio=2 tid=0x0000000068bea800 nid=0x1ad0 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread2" #8 daemon prio=9 os_prio=2 tid=0x0000000068be4000 nid=0x17d0 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread1" #7 daemon prio=9 os_prio=2 tid=0x0000000068bdd800 nid=0x3238 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #6 daemon prio=9 os_prio=2 tid=0x0000000068bda000 nid=0x1824 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Attach Listener" #5 daemon prio=5 os_prio=2 tid=0x0000000068bd8800 nid=0x910 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" #4 daemon prio=9 os_prio=2 tid=0x0000000068bd7800 nid=0x31f8 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" #3 daemon prio=8 os_prio=1 tid=0x0000000043229800 nid=0x2810 in Object.wait() [0x00000000fffee000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000719d707e0> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x0000000719d707e0> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) "Reference Handler" #2 daemon prio=10 os_prio=2 tid=0x0000000043223000 nid=0xd48 in Object.wait() [0x00000000bffef000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000719d78370> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157) - locked <0x0000000719d78370> (a java.lang.ref.Reference$Lock) "main" #1 prio=5 os_prio=0 tid=0x000000000311d800 nid=0x2ed0 waiting on condition [0x000000004311e000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x0000000719d58fe0> (a java.util.concurrent.FutureTask) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429) at java.util.concurrent.FutureTask.get(FutureTask.java:191) at ThreadedSortingComparsion.start(ThreadedSortingComparsion.java:48) at ThreadedSortingComparsion.main(ThreadedSortingComparsion.java:162) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) "VM Thread" os_prio=2 tid=0x0000000056348800 nid=0x2984 runnable "GC task thread#0 (ParallelGC)" os_prio=0 tid=0x0000000043147000 nid=0x27e0 runnable "GC task thread#1 (ParallelGC)" os_prio=0 tid=0x0000000043148800 nid=0x20b4 runnable "GC task thread#2 (ParallelGC)" os_prio=0 tid=0x000000004314a000 nid=0x1da4 runnable "GC task thread#3 (ParallelGC)" os_prio=0 tid=0x000000004314c000 nid=0x29e0 runnable "GC task thread#4 (ParallelGC)" os_prio=0 tid=0x000000004314e000 nid=0xa04 runnable "GC task thread#5 (ParallelGC)" os_prio=0 tid=0x0000000043150000 nid=0x14b8 runnable "GC task thread#6 (ParallelGC)" os_prio=0 tid=0x0000000043153800 nid=0xf00 runnable "GC task thread#7 (ParallelGC)" os_prio=0 tid=0x0000000043154800 nid=0x243c runnable "VM Periodic Task Thread" os_prio=2 tid=0x0000000068c82000 nid=0x22d8 waiting on condition JNI global references: 224 Heap PSYoungGen total 76288K, used 13755K [0x0000000715580000, 0x000000071aa80000, 0x00000007c0000000) eden space 65536K, 4% used [0x0000000715580000,0x0000000715874910,0x0000000719580000) from space 10752K, 99% used [0x0000000719580000,0x0000000719ffa348,0x000000071a000000) to space 10752K, 0% used [0x000000071a000000,0x000000071a000000,0x000000071aa80000) ParOldGen total 175104K, used 33211K [0x00000005c0000000, 0x00000005cab00000, 0x0000000715580000) object space 175104K, 18% used [0x00000005c0000000,0x00000005c206ed30,0x00000005cab00000) Metaspace used 4277K, capacity 4790K, committed 4992K, reserved 1056768K class space used 484K, capacity 535K, committed 640K, reserved 1048576K quick sort: 355.579434803s merge sort: 355.629940032s insertion sort: 355.532578023s </code></pre>

38,427,546

1

6

null

2016-07-13 14:31:47.833 UTC

17

2016-09-06 16:22:29.11 UTC

null

1,283,519

null

3,319,557

null

1

25

java|multithreading|jvm|executorservice|java-threads

3,864

<blockquote> TL;DR HotSpot JIT optimization to eliminate safepoint checks in counted loops played a sick joke. </blockquote> This is a very interesting question: a simple Java test reveals a non-trivial problem deep inside JVM. The fact that a thread dump hasn't appeared immediately indicates that the problem is not in Java code, but is somehow related to JVM. Thread dumps are printed at safepoints. The delay means that VM wasn't able to reach a safepoint in short time. <h2>Background</h2> Certain VM operations (GC, Deoptimization, Thread dump and <a href="https://stackoverflow.com/questions/29666057/analysis-on-gc-logs/29673564#29673564">some other</a>) are executed at stop-the-world pauses when no Java threads are running. But Java threads could not be stopped at any arbitrary point, they can pause only at certain places called safepoints. In JIT-compiled code the safepoints are usually placed at method exits and at backward branches, i.e. inside loops. The safepoint checks are relatively cheap in terms of perfomance, but not free. That's why JIT compiler tries to reduce number of safepoints where possible. One such optimization is to eliminate safepoint checks in counted loops, i.e. loops with an integer counter that are known to have finite number of iterations. <h2>Verify the theory</h2> Let's get back to our test and check if safepoints are reached in time. Add <code>-XX:+SafepointTimeout -XX:SafepointTimeoutDelay=1000</code> JVM options. This should print a debug message whenever VM fails to reach a safepoint in 1000 ms. <pre><code># SafepointSynchronize::begin: Timeout detected: # SafepointSynchronize::begin: Timed out while spinning to reach a safepoint. # SafepointSynchronize::begin: Threads which did not reach the safepoint: # "pool-1-thread-2" #12 prio=5 os_prio=0 tid=0x0000000019004800 nid=0x1480 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE # SafepointSynchronize::begin: (End of list) </code></pre> Yes, it printed that the thread <code>pool-1-thread-2</code> could not stop in 1000 ms. This is the second thread of the Executor's pool, which should run <code>insertionSort</code> algorithm. <code>insertionSort</code> has two very long nested counted loops, and it looks like JVM has eliminated safepoint checks inside them. So, if this method runs in compiled mode, JVM cannot stop it until the method completes. If a stop-the-world pause is requested while the method is running, all other threads will also wait. <h2>What to do?</h2> This issue has been known for a long time. Here is the related JVM bug: <a href="https://bugs.openjdk.java.net/browse/JDK-5014723" rel="noreferrer">JDK-5014723</a>. It's not a high-priority one, since the problem rarely appears in real-life applications. A new JVM flag appeared in JDK 8u92 to work around the issue. <code>-XX:+UseCountedLoopSafepoints</code> will always put safepoint checks inside loops. Another solution would be to transform a long counted loop into generic one by modifying a counter variable inside the loop. E.g. if you replace <code>if (breaker) break;</code> with <code>if (breaker) j = 0;</code> the problem will also disappear. <h2>Why does it work in debug mode then?</h2> When JVM is started with the debugger on, some JIT optimizations are disabled to make the debug info available. In this case the compiled code has all the safepoint checks.

7,806,921

Log user in with remember-me functionality in Spring 3.1

I currently log users in programmatically (like when they login through Facebook or other means than using my login form) with: <pre><code>SecurityContextHolder.getContext().setAuthentication( new UsernamePasswordAuthenticationToken(user, "", authorities) ); </code></pre> What I want to do instead is log the user in as if they set the remember-me option on in the login form. So I'm guessing I need to use the <code>RememberMeAuthenticationToken</code> instead of the <code>UsernamePasswordAuthenticationToken</code>? But what do I put for the <code>key</code> argument of the constructor? <pre><code>RememberMeAuthenticationToken(String key, Object principal, Collection<? extends GrantedAuthority> authorities) </code></pre> UPDATE: I'm using the <a href="http://static.springsource.org/spring-security/site/docs/3.1.x/reference/remember-me.html" rel="noreferrer">Persistent Token Approach described here</a>. So there is no key like in the Simple Hash-Based Token Approach.

7,811,334

2

null

2011-10-18 12:05:08.153 UTC

11

2017-03-28 04:54:49.18 UTC

2011-10-18 22:46:45.597 UTC

null

326,389

null

326,389

null

1

17

spring|spring-mvc|spring-security|security|remember-me

9,908

I assume you already have <code><remember-me></code> set in your configuration. The way remember-me works is it sets a cookie that is recognized when the user comes back to the site after their session has expired. You'll have to subclass the <code>RememberMeServices</code> (<code>TokenBased</code> or <code>PersistentTokenBased</code>) you are using and make the onLoginSuccess() public. For example: <pre><code>public class MyTokenBasedRememberMeServices extends PersistentTokenBasedRememberMeServices { @Override public void onLoginSuccess(HttpServletRequest request, HttpServletResponse response, Authentication successfulAuthentication) { super.onLoginSuccess(request, response, successfulAuthentication); } } <remember-me services-ref="rememberMeServices"/> <bean id="rememberMeServices" class="foo.MyTokenBasedRememberMeServices"> <property name="userDetailsService" ref="myUserDetailsService"/>  </bean> </code></pre> Inject your RememberMeServices into the bean where you are doing the programmatic login. Then call <code>onLoginSuccess()</code> on it, using the UsernamePasswordAuthenticationToken that you created. That will set the cookie. <pre><code>UsernamePasswordAuthenticationToken auth = new UsernamePasswordAuthenticationToken(user, "", authorities); SecurityContextHolder.getContext().setAuthentication(auth); getRememberMeServices().onLoginSuccess(request, response, auth); </code></pre> UPDATE @at improved upon this, with no subclassing of <code>RememberMeServices:</code> <pre><code>UsernamePasswordAuthenticationToken auth = new UsernamePasswordAuthenticationToken(user, "", authorities); SecurityContextHolder.getContext().setAuthentication(auth); // This wrapper is important, it causes the RememberMeService to see // "true" for the "_spring_security_remember_me" parameter. HttpServletRequestWrapper wrapper = new HttpServletRequestWrapper(request) { @Override public String getParameter(String name) { return "true"; } }; getRememberMeServices().loginSuccess(wrapper, response, auth); </code></pre>

7,880,107

In proguard, how to preserve a set of classes' method names?

I am using proguard to obfuscate my android application. The android application contains some native code, which makes callbacks to fully qualified java methods. I need to not obfuscate these classes and the names of their methods. The below properly keeps the class names, but not the method names. <pre><code>-keep public class com.me.dontobf.* -keepnames public class com.me.dontobf.* </code></pre>

7,881,522

2

0

null

2011-10-24 18:30:02.05 UTC

6

2019-05-12 07:39:14.73 UTC

2011-10-24 18:37:34.163 UTC

null

426,493

null

426,493

null

1

28

java|android|proguard

36,491

For native methods: <a href="https://www.guardsquare.com/en/products/proguard/manual/examples#native" rel="noreferrer">ProGuard manual > Examples > Processing native methods</a> <pre><code># note that <methods> means any method -keepclasseswithmembernames,includedescriptorclasses class * { native <methods>; } </code></pre> In this case, for callback methods: <a href="https://www.guardsquare.com/en/products/proguard/manual/examples#callback" rel="noreferrer">ProGuard manual > Examples > Processing callback methods</a> <pre><code>-keep class mypackage.MyCallbackClass { void myCallbackMethod(java.lang.String); } </code></pre> Or e.g., if all public methods may be callback methods: <pre><code>-keep class mypackage.MyCallbackClass { public <methods>; } </code></pre> You probably also need to keep any program classes that occur in the method descriptors.

9,067,536

html5 forms with polyfills - is it worth it?

Despite all of the buzz around html5 forms, it seems to me like you are creating extra work, in most scenarios, by going this route. Take, for example, a datepicker field. The native html5 implementation of this renders differently in every browser. In addition your polyfilled solution (jquery UI for instance), for a browser not supporting this feature, will also render differently. Now, we have introduced multiple points of customization and maintenance for the same form, when we had a perfectly working and unified solution with jquery! I'd love to hear about some real world experiences in this area, because I'm getting annoyed with all of the buzz!

9,133,465

3

6

null

2012-01-30 16:52:31.38 UTC

24

2015-09-29 10:01:00.807 UTC

2013-06-06 17:47:40.94 UTC

null

680,909

null

726,523

null

1

42

html|forms|polyfills|webshim

22,029

First of all I'm the creator of <a href="http://afarkas.github.com/webshim/demos/index.html" rel="noreferrer">webshims lib</a> (one of those polyfills, which isn't maintained anymore). To answer your question: <h1>Is it worth creating a forms polyfill for a project?</h1> No, it is really hard to do this just for one project. Well, I have done it, simply because I want to use modern technologies. <h1>Is it worth using a forms polyfill like webshims lib for a project?</h1> Yes absolutely! And here is why: <h2>1. Nice standardized declarative Markup API</h2> After including webshims and scripting the following: <pre><code>//polyfill forms (constraint validation) and forms-ext (date, range etc.) $.webshims.polyfill('forms forms-ext'); </code></pre> You can simply write your widgets and your constraints into your form: <pre><code><input type="date" /> <input type="date" min="2012-10-11" max="2111-01-01" /> <input type="range" disabled /> <input type="email" required placeholder="Yo you can use a placeholder" /> </code></pre> This will create 3 different widgets and each are configured differently. No extra JS needed just standardized, clean and lean code. <h2>2. Standardized DOM-API</h2> Same goes to the DOM API. Here are just two examples: <a href="http://jsfiddle.net/trixta/SWQme/" rel="noreferrer">Combining two date fields</a> and <a href="http://jsfiddle.net/trixta/werS3/" rel="noreferrer">combining a range field with a date field</a>. <h2>3. works without JS in modern browsers</h2> Degrades gracefully in old browsers and works well in modern ones. <h2>4. Less file size in modern browsers</h2> Especially good for mobile (iOS 5, Blackberry have support for date for example) <h2>5. Better UX [mostly mobile]</h2> Better mobile UX (better input UI for touch, better performance, fits to the system), if you are using it: <a href="http://www.456bereastreet.com/lab/html5-input-types/email-iphone.png" rel="noreferrer">type="email"</a>, <a href="http://www.456bereastreet.com/lab/html5-input-types/number-iphone.png" rel="noreferrer">type="number"</a> and <a href="http://www.mobilexweb.com/wp-content/uploads/2011/10/input.png" rel="noreferrer">type="date"/type="range"</a> <h1>But still, what about customizability?</h1> I'm a developer in a bigger agency and you are absolutely right most clients and most designers won't tolerate much differences, but I still want to use modern technologies, which means webshims lib can give you the best of both worlds. <h2>Customizing the constraint validation</h2> The polyfilling part <pre><code>//polyfill constraint validation $.webshims.polyfill('forms'); </code></pre> Customizing the UI for the error-bubble: <pre><code>//on DOM-ready $(function(){ $('form').bind('firstinvalid', function(e){ //show the invalid alert for first invalid element $.webshims.validityAlert.showFor( e.target ); //prevent browser from showing native validation message return false; }); }); </code></pre> generates the following markup: <pre><code> Error message of the current field </code></pre> Customizing the style of an invalid/valid form field: <pre><code>.form-ui-invalid { border-color: red; } .form-ui-valid { border-color: green; } </code></pre> Customizing the text of the validity alert: <pre><code><input required data-errormessage="Hey this is required!!!" /> </code></pre> And now, what's the point: <ol> <li>still works without JS</li> <li>modern browsers load only the customization code (3kb min/gzipped) and old browsers do load the additional API (about 13kb min/gzip) (forms include a lot more than just constraint validation API, for example there is also autofocus, placeholder, output and so on)</li> </ol> <h2>And what is with your special example, customizing the datefield?</h2> No problem: <pre><code>//configure webshims to use customizable widget UI in all browsers $.webshims.setOptions('forms-ext', { replaceUI: true }); $.webshims.polyfill('forms forms-ext'); </code></pre> And also here: <ol> <li>still works without JS in modern browsers</li> <li>modern browsers only load the UI and the UI-API glue, but not the DOM-API (valueAsNumber, valueAsDate...)</li> </ol> And now, here comes the best: <pre><code>//configure webshims to use customizable widget UI in all non mobile browsers, but a customizable one in all desktop and all non-capable mobile browsers $.webshims.setOptions('forms-ext', { //oh, I know this is bad browser sniffing :-( replaceUI: !(/mobile|ipad|iphone|fennec|android/i.test(navigator.userAgent)) }); $.webshims.polyfill('forms forms-ext'); </code></pre> <ol> <li>less file size and a better UX for mobile browsers (most clients and most designers will love you for having a different UI in mobile!!!)</li> <li>still works without JS in modern browsers</li> <li>modern browsers only load the UI and the UI-API glue, but not the DOM-API (valueAsNumber, valueAsDate...)</li> </ol>

9,124,995

Generating Java from WSDL for use on Android with ksoap2-android SOAP client?

I have to access a existing SOAP webservice from an Android application. I have been provided some WSDL files describing the webservice. Reading some <a href="https://stackoverflow.com/questions/297586/how-to-call-soap-web-service-with-android">other answers here on SO</a>, it seems <a href="http://code.google.com/p/ksoap2-android/" rel="noreferrer">ksoap2-android</a> is the way to go, with respect to which SOAP client to use. The next issue is then how to generate the Java classes needed from the WSDL files, and this is where I am coming up short. As far as I can see there are the following options: <ol> <li><a href="http://axis.apache.org/axis2/java/core/tools/eclipse/wsdl2java-plugin.html" rel="noreferrer">AXIS2 code generator</a></li> <li><a href="http://code.google.com/p/wsdl2ksoap/" rel="noreferrer">WSDL2ksoap</a></li> <li><a href="http://docs.oracle.com/javase/6/docs/technotes/tools/share/wsimport.html" rel="noreferrer">JAX-WS wsimport tool</a></li> </ol> I initially tried #1, with the AXIS2 eclipse plugin for wsdl2code generator. The wizard did successfully generate a lot of Java code, however it also changed my android project to some kind of webservice project, and I was never able to get anything that was generated to compile, let alone work with ksoap2-android. Has anybody has success with this? I am not able to run wsdl2ksoap successfully, as it seems to require a running webservice, and all I have at the current point in time is WSDL files. Likewise from reading the webpage, it seems to be a project in its initial stages, and not really ready for prime time. JAX-WS wsimport I have not had a chance to try yet. However I am unsure if what it generates will work with ksoap2-android? Question: How can I generate Java files from WSDL files, for use on Android with ksoap2-android SOAP client library? Thanks a lot in advance. (PS: Yes, the choice is SOAP, it is suboptimal for Android use, but I cannot change that.)

9,273,472

6

10

null

2012-02-03 07:14:15.717 UTC

17

2019-12-10 11:12:14.02 UTC

2017-05-23 12:06:45.623 UTC

null

-1

null

81,398

null

1

36

java|android|soap|wsdl|ksoap2

38,909

My conclusion after quite a bit of researching is that there is no such (mature) tool available, unfortunately. Neither AXIS2 or JAX-WS will work on Android, and WSDL2ksoap is simply too immature for any real use. However there is a proprietary tool called <a href="http://wsclient.neurospeech.com/" rel="nofollow">wsclient++</a> that will do the job really well. (Read update below, when put to real use, it does not stand the distance at all.) It does not use the ksoap2-android client library, it has it's own. The client library is a bit crude as it has a hard dependency on the http transport, making (unit) testing a bit complicated. But it can be modified quite easily to allow DI, as the source is available in the distributed jar file. The wsdl to java generator however works just perfect, and will save us tons of time. Update After working with <code>wsclient++</code> for a while, it is clear that the generated classes are really crude, and does not handle error cases at all. (Every method declares <code>throws Exception</code>). We are no longer using wsclient++, and I would not recommend anyone to use it! We have not really found any working alternative, unfortunately. :/ In the end we converted our WSDL files using AXIS2, and then wrote a bunch of custom script to strip and transform the generated java files to something that will build on android using ksoap2-android library. Very hackish, and needs tons of manual labor to run. Unfortunately. If you find a better way, or one comes up, please provide a new answer.

23,802,970

WAMP/MySQL errors not in correct language

I've re-installed WAMP multiple times, searched literally hundreds of pages, and its not fixed this issue: <img src="https://i.stack.imgur.com/slrfD.png" alt="enter image description here"> I've looked inside the phpmyadmin config files, set: <pre><code>$cfg['Lang'] = 'en-utf-8'; </code></pre> Uninstalled multiple times (as mentioned) and seemed to have no luck what so ever. Any help would be appreciated.

23,907,676

3

6

null

2014-05-22 09:34:41.3 UTC

15

2018-08-24 02:26:26.197 UTC

2014-06-08 14:07:03.543 UTC

null

3,444,240

null

3,664,313

null

1

76

php|mysql|phpmyadmin|wampserver

48,978

To change the language that MySQL uses when reporting you need to change the <code>my.ini</code> file as follows. Find this line: <pre><code># Change your locale here ! lc-messages=fr_FR </code></pre> And change it to your prefered language, for example: <pre><code>lc-messages=en_GB </code></pre> To change it to English US, you can do like this: <pre><code>lc-messages=en_US </code></pre> Save the file and then restart MySQL. <pre><code>left click wampmanager icon -> MySQL -> Service -> Restart Service </code></pre> Remember the guys that produce WampServer are French so I guess thats why this has been added to the <code>my.ini</code> file, and they just forgot to remove it on this release. <h3>How to Find my.ini in WAMPServer</h3> Use the wampmanager menus like so :- <pre><code>left click wampmanager icon -> MySQL -> my.ini </code></pre> This will load the my.ini file into your editor. <blockquote> Here you can find a list of <a href="https://dev.mysql.com/doc/refman/5.7/en/locale-support.html" rel="noreferrer">valid locales</a> </blockquote>

8,598,021

iTerm 2 profiles

I have recently switched over to iTerm2 and love it. I am wondering though if there is a way to use profiles to correspond to what environment/specific machine you are on. Say if I am doing tasks in one window on my mac the profile is displayed as default, but if I ssh into a machine (lets say dev0), the profile on iTerm will update to profile dev0. Once I've finished with dev0 and call exit, the profile will switch to default again. I realize one work around is to open up a specific profile whenever I want to ssh into another machine and have a way to distinguish, but if the connection is closed it requires you to notice based off text rather than say the background of the window. Is this possible? If not how can this feature be added, and is there a way I can contribute?

8,600,248

7

3

null

2011-12-22 00:15:58.903 UTC

27

2019-03-30 02:06:36.013 UTC

null

1,076,611

null

1

46

macos|iterm

29,048

iTerm2 supports a custom escape code that changes the profile on the fly. Put it in your .bashrc or .bash_profile. <pre><code><esc>]50;SetProfile=X^G </code></pre> where X is the profile. For instance, to change the profile to one called "Foo", us this shell script: <pre><code>#!/bin/bash echo -e "\033]50;SetProfile=Foo\a" </code></pre> To change it back when you log out, put code to change the profile back to default in ~/.bash_logout.

5,058,854

Using Mathematica to build presentations and documents

I use Mma mainly to solve relatively small problems. I want to start using it also to prepare my presentations and documents, but I am having troubles to learn how to do it from the embedded help, and I guess some good resources may be available elsewhere. Do you know any useful pointers (books, papers, videos ...)? Do you have a "bag of tricks" to post here? Edit This question received two answers so far (@mzabsky's and Mr.Wizard's) and although both are useful, perhaps my concerns are much more basic. So I am posting an example of the kind of things I am unable to do (or understand how to discern how others did them). I took the following example from <a href="http://www.mathematica-journal.com/issue/v10i1/contents/graph_draw/graph_draw.nb" rel="noreferrer">The Mathematica Journal</a> (the notebook at the left on the following image - click on the image to see full size): <a href="https://i.stack.imgur.com/iPBRD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/iPBRD.png" alt="Enter image description here"></a> So, some issues, just to get the idea of my troubles: 1) I copied the text to my .nb on the right, formatted it with the same style (text), but the appearance is different, so I guess the style definition is different. How can I copy the style definitions from one .nb to the other? 2) The table below the text block doesn't have an attached style. How was it formatted? Where is the background color defined? I would like pointers to read (or videos to look, or whatever) about these issues. I don't want you to write down here a book on Mathematica formatting! <h2>Summary of the links posted in answers</h2> <ul> <li><a href="http://forums.wolfram.com/mathgroup/archive/2007/Jul/msg00914.html" rel="noreferrer">A Mathgroup thread</a> (John Browne) and <a href="http://forums.wolfram.com/mathgroup/archive/2007/Jul/msg00832.html" rel="noreferrer">here</a> (David Park and Selwyn Hollis)</li> <li><a href="http://bobueland.com/2008/06/14/create-a-style-sheet/" rel="noreferrer">Advice from Bob Ueland</a></li> <li><a href="http://reference.wolfram.com/mathematica/guide/PalettesMenu.html" rel="noreferrer">The Writing Assistant Palette</a></li> <li><a href="http://home.comcast.net/~djmpark/" rel="noreferrer">David Park's notes</a></li> <li><a href="ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/" rel="noreferrer">Simon's documents</a></li> <li><a href="http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Notebook:Tips.nb" rel="noreferrer">Tips for Mathematica SlideShow presenters</a></li> <li><a href="http://library.wolfram.com/tips/notebookformatting.html" rel="noreferrer">Notebook formatting</a></li> <li><a href="http://library.wolfram.com/infocenter/Conferences/7564/" rel="noreferrer">Presentations with Mathematica</a></li> <li><a href="http://www.wolfram.com/broadcast/#Tutorials-Notebooks" rel="noreferrer">Videos</a></li> <li><a href="http://library.wolfram.com/infocenter/TechNotes/5299/" rel="noreferrer">Tips for Mathematica Slide Show Presenters</a></li> <li><a href="http://library.wolfram.com/infocenter/MathSource/6282/" rel="noreferrer">How to - Automatic Slide Show</a></li> <li><a href="http://reference.wolfram.com/mathematica/howto/CreateALectureNotebook.html" rel="noreferrer">Create a Lecture Notebook</a></li> </ul>

5,061,599

4

1

null

2011-02-20 17:59:44.337 UTC

42

2016-02-13 02:36:56.113 UTC

null

353,410

null

353,410

null

1

40

wolfram-mathematica

12,711

I agree with all that mzabsky said in his answer. Here's a few of extra things: I find it useful to make statements using a <code>Text</code> or <code>DisplayFormula</code> cell then manually group a Mathematica check/proof to the statement which is then collapsed and can be displayed when you want. The <a href="http://reference.wolfram.com/mathematica/guide/PalettesMenu.html" rel="nofollow">Writing Assistant Palette</a> has quite a few useful constructions in it that you can learn from. Finally, I found it really useful to make my own style sheet for a couple reasons: 1) the built-in ones are a bit ugly; 2) it really helps you to understand how the notebooks work. To see examples of the stylesheet I made (which I don't claim to be perfect - I didn't bother making it work in all screen environments) look at some of the files in <a href="ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/" rel="nofollow">ftp://ftp.physics.uwa.edu.au/pub/MATH2200/2010/</a>. I use a similar stylesheet in all of my notes - I have many research projects primarily contained in Mma notebooks, eg <a href="http://arxiv.org/abs/1102.3043" rel="nofollow">http://arxiv.org/abs/1102.3043</a>. Like Mr Wizard, I also recommend <a href="http://home.comcast.net/~djmpark/" rel="nofollow">David Park's notes</a> as a starting point. Also, you should study stylesheets that you like by going to the Format menu and clicking "Edit Stylesheet". Don't forget to follow the links through the cascade of stylesheets (version 6 onwards). To answer the questions in your edit: Once you are viewing a notebook's stylesheet, you can save it, edit it, and use it in your own documents. Stylesheets in <code>$UserBaseDirectory/SystemFiles/FrontEnd/StyleSheets</code> are automatically available in the menu. You can then use that stylesheet in any notebook by simply selecting it from the menu. The formating in the screenshot that you posted is all contained in the stylesheet. This includes the grey background in the table. <h2>Addendum:</h2> When distributing notebooks to others, if the stylesheet is external from the notebook, then other people will not see it as you do. To include the stylesheet into the current notebook, you need code like <pre><code>ss = StyleDefinitions /. Options[EvaluationNotebook[]] fn = ToFileName[{$UserBaseDirectory, "SystemFiles", "FrontEnd", "StyleSheets"}, ss] If[FileExistsQ[fn], style=Get[fn];SetOptions[EvaluationNotebook[],StyleDefinitions->style];, Print["Can not find file"]] </code></pre> (Assuming the file is in stored in the conventional place) Here's an <a href="http://pastebin.com/ENLbMW9L" rel="nofollow">EmbedStylesheet.m</a> that is an improved version of the above.

5,122,345

Why use Apache Web Server in front of Glassfish or Tomcat?

Is it good idea to use Apache Webserver in front of GF or Tomcat? Does it improve the performance/security? Or there is not any reason to use Apache Web Server with GF?

5,122,553

5

1

null

2011-02-25 20:38:13.31 UTC

34

2020-02-20 23:19:57.2 UTC

2011-09-13 02:19:01.357 UTC

null

25,688

null

192,315

null

1

57

apache|tomcat|glassfish

39,749

Taken from <a href="https://cwiki.apache.org/confluence/display/TOMCAT/Connectors#Connectors-Q3" rel="nofollow noreferrer">https://cwiki.apache.org/confluence/display/TOMCAT/Connectors#Connectors-Q3</a> <ul> <li>Clustering. By using Apache HTTP as a front end you can let Apache HTTP act as a front door to your content to multiple Apache Tomcat instances. If one of your Apache Tomcats fails, Apache HTTP ignores it and your Sysadmin can sleep through the night. This point could be ignored if you use a hardware loadbalancer and Apache Tomcat's clustering capabilities.</li> <li>Clustering/Security. You can also use Apache as a front door to different Apache Tomcats for different URL namespaces (/app1/, /app2/, /app3/, or virtual hosts). The Apache Tomcats can then be each in a protected area and from a security point of view, you only need to worry about the Apache HTTP server. Essentially, Apache becomes a smart proxy server.</li> <li>Security. This topic can sway one either way. Java has the security manager while Apache has a larger mindshare and more tricks with respect to security. I won't go into this in more detail, but let Google be your friend. Depending on your scenario, one might be better than the other. But also keep in mind, if you run Apache with Tomcat - you have two systems to defend, not one.</li> <li>Add-ons. Adding on CGI, perl, PHP is very natural to Apache. Its slower and more of a kludge for Tomcat. Apache HTTP also has hundreds of modules that can be plugged in at will. Apache Tomcat can have this ability, but the code hasn't been written yet.</li> <li>Decorators! With Apache HTTP in front of Apache Tomcat, you can perform any number of decorators that Apache Tomcat doesn't support or doesn't have the immediate code support. For example, mod_headers, mod_rewrite, and mod_alias could be written for Apache Tomcat, but why reinvent the wheel when Apache HTTP has done it so well?</li> <li>Speed. Apache HTTP is faster at serving static content than Apache Tomcat. But unless you have a high traffic site, this point is useless. But in some scenarios, Apache Tomcat can be faster than Apache httpd. So benchmark YOUR site. Apache Tomcat can perform at httpd speeds when using the proper connector (APR with sendFile enabled). Speed should not be considered a factor when choosing between Apache httpd and Tomcat</li> <li>Socket handling/system stability. Apache HTTP has better socket handling with respect to error conditions than Apache Tomcat. The main reason is Apache Tomcat must perform all its socket handling via the JVM which needs to be cross platform. The problem is socket optimization is a platform specific ordeal. Most of the time the java code is fine, but when you are also bombarded with dropped connections, invalid packets, invalid requests from invalid IP's, Apache HTTP does a better job at dropping these error conditions than JVM based program. (YMMV) </li> </ul>

5,224,524

Lisp and Prolog for Artificial Intelligence?

Now since i've taken a class 3 years ago in A.I. im clearly proficient enough to ask this question......just kidding just kidding ;) but seriously, what is it about these languages that make them so popular for A.I. research. Even though A.I. research is "old"...it's came probably the longest way in the past 5-10 years it seems like.... Is it because the languages were somewhat "designed" around the concept of A.I. , or just that we have nothing really better to use right now? I ask this because I've always found it quite interesting, and Im just kinda curious. If im entirely wrong and they use different languages I would love to know what all they use. I mean i can understand prolog, especially with Sentient/Propositional Logic and Fuzzy logic. but I dont understand "Why" we would use Lisp...and even what else A.I. researchers would use to do machine learning etc. Any articles/books on the subject matter is helpful too :)

5,224,696

6

4

null

2011-03-07 19:53:14.297 UTC

20

2020-03-05 22:57:46.023 UTC

null

user475353

null

1

34

lisp|artificial-intelligence|prolog

40,835

Can't really speak to Prolog, but here's why Lisp: <ul> <li>Lisp is a <a href="http://en.wikipedia.org/wiki/Homoiconicity" rel="noreferrer">homoiconic</a> language, which means that the code is expressed in the same form (<a href="http://en.wikipedia.org/wiki/S-expression" rel="noreferrer">s-expressions</a>) as data structures in the language. i.e. "code is data". This has big advantages if you are writing code that modifies/manipulates other code, e.g. genetic algorithms or symbolic manipulation.</li> <li>Lisp's macro system makes it well suited for defining problem-specific DSLs. Most Lisp developers effectively "extend the language" to do what they need. Again the fact that Lisp is homoiconic helps enormously here.</li> <li>There is some historical connection, in that Lisp became popular at about the same time as a lot of the early AI research. Some <a href="https://stackoverflow.com/questions/130475/why-is-lisp-used-for-ai">interesting facts in this thread</a>.</li> <li>Lisp works pretty well as a functional programming language. This is quite a good domain fit for AI (where you are often just trying to get the machine to learn how to produce the correct output for a given input).</li> <li>Subjective view: Lisp seems to appeal to people with a mathematical mindset, which happens to be exactly whet you need for a lot of modern AI..... this is possible due to the fact that Lisp is pretty closely related to the untyped lambda calculus </li> </ul> I'm doing some AI/machine learning work at the moment, and chose <a href="http://clojure.org/" rel="noreferrer">Clojure</a> (a modern Lisp on the JVM) pretty much for the above reasons.

5,391,124

Select rows of a matrix that meet a condition

In R with a matrix: <pre><code> one two three four [1,] 1 6 11 16 [2,] 2 7 12 17 [3,] 3 8 11 18 [4,] 4 9 11 19 [5,] 5 10 15 20 </code></pre> I want to extract the submatrix whose rows have column three = 11. That is: <pre><code> one two three four [1,] 1 6 11 16 [3,] 3 8 11 18 [4,] 4 9 11 19 </code></pre> I want to do this without looping. I am new to R so this is probably very obvious but the documentation is often somewhat terse.

5,391,697

6

1

null

2011-03-22 12:21:48.457 UTC

67

2019-06-01 18:35:33.703 UTC

2018-05-28 10:10:50.423 UTC

null

2,204,410

null

205,063

null

1

175

r|select|matrix|submatrix

513,547

This is easier to do if you convert your matrix to a data frame using as.data.frame(). In that case the previous answers (using subset or m$three) will work, otherwise they will not. To perform the operation on a matrix, you can define a column by name: <pre><code>m[m[, "three"] == 11,] </code></pre> Or by number: <pre><code>m[m[,3] == 11,] </code></pre> Note that if only one row matches, the result is an integer vector, not a matrix.

5,383,401

Android INJECT_EVENTS permission

I am trying to create an application that will have a service running in the background that will be capable of injecting touch screen events into whatever activity is running. I am able to inject events into an Activity that is part of my application by calling <code>Instrumentation.sendPointerSync(motionEvent);</code> However if I try to do this without an activity from my application running I get a permission error saying that I don't have the INJECT_EVENTS permission. I've added this permission to my manifest like this: <code><uses-permission android:name="android.permission.INJECT_EVENTS"></uses-permission></code> Its still throwing the same permission exception though. After a bit of searching I've gotten the answer that in order to receive the INJECT_EVENTS permission your app must be signed by the same signature that the system is signed with. I am unclear however what exactly this means. I am going to have to find a custom rom build it and sign it with the same signature that the application is signed with. Then install the custom rom on my device, then install my app and I'll be able to inject the touch events correctly? If this is the case am I better off starting with a custom rom that is already put together, like one <a href="http://theunlockr.com/category/roms-2/android-roms-2/htc-g2-desire-z-roms/">from this page</a> Or is it a situation where I am going to need to grab a git copy of the android project and build the whole thing myslef? And either way does anyone know of a place you could point me that would get me working in the right direction to make this happen?

7,328,055

8

2

null

2011-03-21 20:41:56.967 UTC

28

2021-02-02 11:39:17.573 UTC

null

507,810

null

1

47

android|permissions|rom

63,331

Actually, this is pretty simple on a rooted device. I think any app that is running off /system will get access to whatever permissions it requires. So simply manually install your App to /system (as described here <a href="http://androidforums.com/droid-all-things-root/64603-installing-apk-system-app-directory.html" rel="nofollow noreferrer">http://androidforums.com/droid-all-things-root/64603-installing-apk-system-app-directory.html</a> ): Execute the following commands in the terminal emulator to remount the /system directory as read/write and to install the application into the /system/app directory from the SDCARD: <pre><code>su mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system cp /sdcard/APP.apk /system/app </code></pre> If you prefer to use adb from your computer, execute these commands: <pre><code>adb remount adb shell cp /sdcard/APP.apk /system/app </code></pre> Several users have utilized root explorer from the Google marketplace to simplify this process. <hr> Alternatively, check this out: <a href="https://stackoverflow.com/questions/3598662/how-to-compile-android-application-with-system-permissions">How to compile Android Application with system permissions</a>

16,805,288

JQuery get values from html table

I am attempting to pull data from a dynamic table using JQuery, but every way I've tried turns the values into something else (the below code will return an "l" instead of the N/A I was expecting. I have tried using .each and .map as the function as well as .val .html and as you can see .text to pull the data. I am stuck as to why and what I am doing wrong. Any help would be greatly appreciated. HTML <pre><code> <table id="attendees" class="attendees"> <thead> <tr style="border-bottom: double;border-color: #007fff" ;=""> <th>Full Name</th> <th>Membership Type</th> <th>Membership Expiration Date</th> <th>Free Vouchers</th> <th>Classes From Pack Remaining</th> <th>Yelp Check in</th> <th>Payment Option</th> <th>Remove</th> </tr> </thead> <tbody> <tr class="data"> <td>Students Name</td> <td>N/A</td> <td>N/A</td> <td>0</td> <td>0</td> <td>Yes</td> <td> <ul id="list"> <select id="payment" name="payment"> <option>Cash/Credit</option> <option>Free Voucher</option> <option>Yelp Check-in</option> </select> </ul> </td> <td> <div><a href="#" class="remove">Remove</a> </div> </td> </tr> </tbody> </table> </code></pre> JQuery <pre><code>$("#submit").live('click', function (e) { $("#attendees tr.data").map(function (index, elem) { var x = $(this); var cells = x.find('td'); var $data = cells.text(); //alert($data[1]); if ($data[1] == "N/A") { alert(true); } }); e.preventDefault(); }); </code></pre> Final Solution Thanks first of all to everyone who chimed in, I honestly learned a little something from each persons answer. In the end this is what I settled on below. In hindsight I probably should of given a more thorough description on what I was attempting to accomplish. Which was to scan multiple rows of data and do something based on the info found in each row. To accomplish this I was forced to separate the <code>tr</code> and <code>td</code> <code>.each</code> functions. This allowed me to scan row by row and still get the individual data. Thanks again for everyone's help especially @TechHunter <pre><code>$("#submit").on('click', function (e) { e.preventDefault(); $("#attendees tbody tr").each(function(i) { var $data= []; var x = $(this); var cells = x.find('td'); $(cells).each(function(i) { var $d= $("option:selected", this).val()||$(this).text(); $data.push($d); }); if ($data[1] == "N/A") { doSomething(); } }); }); </code></pre>

16,807,573

3

0

null

2013-05-29 04:02:42.737 UTC

2

2016-10-15 17:28:58.707 UTC

null

4,370,109

null

2,333,349

null

1

3

jquery|html|arrays|object|html-table

38,301

Simplest answer would be to add a class when you need to retrieve a value : HTML <pre><code><table id="attendees" class="attendees"> <thead> <tr style="border-bottom: double;border-color: #007fff" ;=""> <th>Full Name</th> <th>Membership Type</th> <th>Membership Expiration Date</th> <th>Free Vouchers</th> <th>Classes From Pack Remaining</th> <th>Yelp Check in</th> <th>Payment Option</th> <th>Remove</th> </tr> </thead> <tbody> <tr class="data"> <td class="inputValue">Students Name</td> <td class="inputValue">N/A</td> <td class="inputValue">N/A</td> <td class="inputValue">0</td> <td class="inputValue">0</td> <td class="inputValue">Yes</td> <td> <ul id="list"> <select id="payment" class="inputValue" name="payment"> <option>Cash/Credit</option> <option>Free Voucher</option> <option>Yelp Check-in</option> </select> </ul> </td> <td> <div><a href="#" class="remove">Remove</a> </div> </td> </tr> </tbody> </table> </code></pre> Javascript <pre><code>$("#submit").on('click', function (e) { e.preventDefault(); var data = $("#attendees tr.data").map(function (index, elem) { var ret = []; $('.inputValue', this).each(function () { var d = $(this).val()||$(this).text(); ret.push(d); console.log(d); if (d == "N/A") { console.log(true); } }); return ret; }); console.log(data); console.log(data[0]); }); </code></pre> It's easier and you only retrieve value you want to retrieve. Fast to implement and to maintain. <a href="http://jsfiddle.net/techunter/Tz4Ux/" rel="nofollow">Fiddle here</a>

12,557,442

Bug in iPhone Simulator 5.1 with Xcode 4.5 using UIManagedDocument

I have a very weird problem I've spent the last two days trying to solve... I had a piece of code that was working perfectly fine on Xcode 4.4 and iOS 5.1 Simulator, using the 5.1 SDK. After I updated to Xcode 4.5 and the 6.0 SDK, my code stopped working in the iOS 5.1 Simulator... even though it works perfectly fine in the iOS 6.0 Simulator. Was there any change I'm not aware of? This is the code: <pre><code>- (void)useDocument { if (![[NSFileManager defaultManager] fileExistsAtPath:[self.database.fileURL path]]){ [self.database saveToURL:self.database.fileURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success){ [self setupFetchedResultsController]; }]; } else if (self.database.documentState == UIDocumentStateClosed){ [self.database openWithCompletionHandler:^(BOOL success){ [self setupFetchedResultsController]; }]; } else if (self.database.documentState == UIDocumentStateNormal) { [self setupFetchedResultsController]; } } </code></pre> For some reason saveToURL and openWithCompletionHandler never return in the 5.1 Simulator. Any one knows why?

12,576,978

3

5

null

2012-09-24 00:26:16.057 UTC

8

2012-10-15 08:35:31.813 UTC

2012-09-25 11:31:09.437 UTC

null

624,459

null

545,207

null

1

9

ios|xcode|core-data|xcode4.5|uimanageddocument

2,457

I have the same problem under iPhone Simulator 5.1. The file is created after a long time (30 seconds). But the completion handler is never called. Did you try it on a device? EDIT: This seems a bug in iOS Simulator 5.1. I compiled the code on my old iPad with iOS 5.1.1 and it worked without an error!

12,126,731

How can I make a div with irregular shapes with css3 and html5?

I'm wondering is there any possibility to build div with irregular shapes, something, similar to this (e.g. Greenland, Europe, Africa). I want to create map like here with using CSS3 and HTML5. Here is link to an example image: <img src="https://i.stack.imgur.com/vMNVT.png" alt="">

12,332,427

3

0

null

2012-08-26 00:20:27.65 UTC

9

2021-06-25 18:21:12.957 UTC

2017-01-18 16:53:46.867 UTC

null

2,756,409

null

1,505,516

null

1

15

html|css|css-shapes

51,699

Elements have always been rectangular. Still, you can simulate other shapes by drawing CSS shapes within the rectangular division and by arranging different divisions (with z-index, etc.). This will help you: <a href="http://css-tricks.com/examples/ShapesOfCSS/" rel="noreferrer">http://css-tricks.com/examples/ShapesOfCSS/</a>

12,479,054

How to run functions outside websocket loop in python (tornado)

I'm trying to set up a small example of a public Twitter stream over websockets. This is my websocket.py, and it's working. What I'm wondering is: how can I interact with the websocket from 'outside' the class WSHandler (ie. not only answer when receiving a message from websocket.js)? Say I want to run some other function within this same script that would post "hello!" every five seconds and send that to the websocket (browser) without any interaction from client-side. How could I do that? So it's kind of a fundamental beginner's question, I suppose, about how to deal with classes as those below. Any pointers in any direction would be greatly appreciated! <pre><code>import os.path import tornado.httpserver import tornado.websocket import tornado.ioloop import tornado.web # websocket class FaviconHandler(tornado.web.RequestHandler): def get(self): self.redirect('/static/favicon.ico') class WebHandler(tornado.web.RequestHandler): def get(self): self.render("websockets.html") class WSHandler(tornado.websocket.WebSocketHandler): def open(self): print 'new connection' self.write_message("Hi, client: connection is made ...") def on_message(self, message): print 'message received: \"%s\"' % message self.write_message("Echo: \"" + message + "\"") if (message == "green"): self.write_message("green!") def on_close(self): print 'connection closed' handlers = [ (r"/favicon.ico", FaviconHandler), (r'/static/(.*)', tornado.web.StaticFileHandler, {'path': 'static'}), (r'/', WebHandler), (r'/ws', WSHandler), ] settings = dict( template_path=os.path.join(os.path.dirname(__file__), "static"), ) application = tornado.web.Application(handlers, **settings) if __name__ == "__main__": http_server = tornado.httpserver.HTTPServer(application) http_server.listen(8888) tornado.ioloop.IOLoop.instance().start() </code></pre>

12,479,455

3

0

null

2012-09-18 14:28:09.753 UTC

15

2016-10-11 08:25:28.643 UTC

2014-04-03 19:05:31.977 UTC

null

1,115,197

null

1,397,442

null

1

32

python|websocket|tornado

16,079

You could call a <pre><code>IOLoop.add_timeout(deadline, callback) </code></pre> that calls the callback at specified deadline timeout (one shot, but you can reschedule), or use the <code>tornado.ioloop.PeriodicCallback</code> if you have a more periodic task. See: <a href="http://www.tornadoweb.org/en/stable/ioloop.html#tornado.ioloop.IOLoop.add_timeout" rel="nofollow">http://www.tornadoweb.org/en/stable/ioloop.html#tornado.ioloop.IOLoop.add_timeout</a> Update: some example <pre><code>import datetime def test(): print "scheduled event fired" ... if __name__ == "__main__": http_server = tornado.httpserver.HTTPServer(application) http_server.listen(8888) main_loop = tornado.ioloop.IOLoop.instance() # Schedule event (5 seconds from now) main_loop.add_timeout(datetime.timedelta(seconds=5), test) # Start main loop main_loop.start() </code></pre> it calls <code>test()</code> after 5 seconds. Update 2: <pre><code>import os.path import tornado.httpserver import tornado.websocket import tornado.ioloop import tornado.web # websocket class FaviconHandler(tornado.web.RequestHandler): def get(self): self.redirect('/static/favicon.ico') class WebHandler(tornado.web.RequestHandler): def get(self): self.render("websockets.html") class WSHandler(tornado.websocket.WebSocketHandler): def open(self): print 'new connection' self.write_message("Hi, client: connection is made ...") tornado.ioloop.IOLoop.instance().add_timeout(datetime.timedelta(seconds=5), self.test) def on_message(self, message): print 'message received: \"%s\"' % message self.write_message("Echo: \"" + message + "\"") if (message == "green"): self.write_message("green!") def on_close(self): print 'connection closed' def test(self): self.write_message("scheduled!") handlers = [ (r"/favicon.ico", FaviconHandler), (r'/static/(.*)', tornado.web.StaticFileHandler, {'path': 'static'}), (r'/', WebHandler), (r'/ws', WSHandler), ] settings = dict( template_path=os.path.join(os.path.dirname(__file__), "static"), ) application = tornado.web.Application(handlers, **settings) import datetime if __name__ == "__main__": http_server = tornado.httpserver.HTTPServer(application) http_server.listen(8888) tornado.ioloop.IOLoop.instance().start() </code></pre>

12,168,873

Cross compile Go on OSX?

I am trying to cross-compile a go app on OSX to build binaries for windows and linux. I have read everything what I could find on the net. Closest example that I have found has been published on (apart from many unfinished discussions on go-nuts mailing list): <a href="http://solovyov.net/en/2012/03/09/cross-compiling-go/">http://solovyov.net/en/2012/03/09/cross-compiling-go/</a> yet it does not work on my installation. I have go 1.0.2. As 1.0.2 is quite recent it looks to me that all above examples do not apply to this version. Tried to do <code>./make.bash --no-clean</code> with ENV vars set to 386/windows, it does build go, however it builds go for my installation which is <code>darwin/amd64</code> and completely ignores what is set in ENV that suppose to build different compiler. Any advises how it can be done (if it can be done at all)?

35,878,611

8

13

null

2012-08-28 23:16:30.23 UTC

99

2021-09-28 12:17:30.633 UTC

2017-02-09 09:03:53.687 UTC

null

2,932,052

null

1,454,391

null

1

159

go|compilation|cross-compiling

151,006

With Go 1.5 they seem to have improved the cross compilation process, meaning it is built in now. No <code>./make.bash</code>-ing or <code>brew</code>-ing required. The process is described <a href="http://dave.cheney.net/2015/08/22/cross-compilation-with-go-1-5">here</a> but for the TLDR-ers (like me) out there: you just set the <code>GOOS</code> and the <code>GOARCH</code> environment variables and run the go build. For the even lazier copy-pasters (like me) out there, do something like this if you're on a *nix system: <pre><code>env GOOS=linux GOARCH=arm go build -v github.com/path/to/your/app </code></pre> You even learned the <code>env</code> trick, which let you set environment variables for that command only, completely free of charge.

18,882,589

Grails 2.3.0 Auto-reloading not working

I recently upgrade our project to grails 2.3.0. Everything works fine except I've been having problems with auto-reload not working whenever I make changes to our code. This include all projects artefacts - controllers, domain, services, gsps, css and javascript files. My older versions of grails work correctly and reloads and recompile every time I make a change. I know this question is popular and I have searched Jira, Nabble and here for days now but none of what I have found have been able to solve my problem (I've even tried to add quotes like Peter suggested in this thread <a href="http://jira.grails.org/browse/GRAILS-7936" rel="nofollow noreferrer">http://jira.grails.org/browse/GRAILS-7936</a> and also this thread <a href="https://stackoverflow.com/questions/12672600/grails-project-not-auto-reloading">Grails Project Not Auto Reloading</a> did not help). Am currently running grails on a Macbook pro with the following settings: <ul> <li>grails version 2.3.0</li> <li>Java version "1.7.0_17" Java(TM) SE Runtime Environment (build 1.7.0_17-b02) Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)</li> <li>Running from terminal with Textmate as IDE</li> </ul> Any help would be greatly appreciated.

18,884,692

5

4

null

2013-09-18 21:23:09.09 UTC

12

2016-07-12 17:28:56.31 UTC

2017-05-23 12:26:13.973 UTC

null

-1

null

1,795,776

null

1

39

java|grails|grails-2.3

16,853

It seems that in Grails 2.3 the reloading is no longer the default <blockquote> In Grails 2.3 the reloading agent is no longer on the build system path unless you pass the -reloading flag to the grails command: grails -reloading run-app </blockquote> However, you can enable forking in your buildConfig using the following configuration: <pre><code>forkConfig = [maxMemory: 1024, minMemory: 64, debug: false, maxPerm: 256] grails.project.fork = [ test: forkConfig, // configure settings for the test-app JVM run: forkConfig, // configure settings for the run-app JVM war: forkConfig, // configure settings for the run-war JVM console: forkConfig // configure settings for the Swing console JVM ] </code></pre> More information : <a href="http://grails.org/doc/2.3.x/guide/single.html#upgradingFromPreviousVersionsOfGrails" rel="noreferrer">Forked Execution and the Reloading Agent</a>

3,319,249

How do I do an LDAP query with JavaScript?

I'm trying to make a sidebar gadget that has an LDAP query function but haven't been able to find very good, or any, useful documentation on the matter. I'm not hugely experienced with Javascript and know little to nothing about how LDAP queries function, so any information at all would be useful. info: <ul> <li>host: a.b.c.d.e</li> <li>port: 389</li> <li>ou: people</li> <li>o: x_y_z</li> <li>c: us</li> </ul> first snippet: <pre><code>var sSearchURL = "ldap://a.b.c.d.e:389/o=x_y_z,c=us"; var URLsuffix = "dc=" + form.SearchData.value; document.location = sSearchURL URLsuffix; </code></pre> other snippet: <pre><code>var ldap = GetObject('LDAP:'); var ad = ldap.OpenDSObject( 'LDAP://a.b.c.d.e:389/o=x_y_z', 'cn=Administrator,ou=People,o=rootname', 'password', 0 ); </code></pre>

3,335,223

4

2

null

2010-07-23 14:45:22.517 UTC

2

2019-08-11 21:19:25.37 UTC

null

5,405,967

null

398,259

null

1

9

javascript|ldap

38,226

As long as you want to run your JavaScript in a web browser, you are limited to the HTTP protocol and to the domain from which your script was loaded in the first place. So, talking to an LDAP server will not be possible from a web browsers JavaScript engine. There are JavaScript runtime environments that have less limitations where you can implement socket servers and clients. For LDAP conenctivity you'd have to write your own library or find some existing one.

11,221,033

Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed

I have a grid view on my page and I want to export it to the Excel Sheet, Below is the code I had written to do this task, here I am already passing the dataset to the method to bind the grid and <code>btnExcelExport</code> is the button which will export the Grid Content in to Excel Sheet :- <pre><code>private void BindGridView(DataSet ds) { if (ds.Tables.Count > 0) { if (ds.Tables[0].Rows.Count > 0) { GVUserReport.DataSource = ds; GVUserReport.DataBind(); btnExcelExport.Visible = true; } } } protected void btnExcelExport_Click(object sender, EventArgs e) { Response.Clear(); Response.AddHeader("content-disposition","attachment;filename=FileName.xls"); Response.Charset = ""; Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.ContentType = "application/vnd.xls"; System.IO.StringWriter stringWrite = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite); GVUserReport.RenderControl(htmlWrite); Response.Write(stringWrite.ToString()); Response.End(); } public override void VerifyRenderingInServerForm(Control control) { return; } </code></pre> Now when I am debugging I found that the grid is binded sucessfully but when trying to export it to Excel, I'm getting this error: <blockquote> "Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed." </blockquote>

11,221,536

9

0

null

2012-06-27 07:06:55.113 UTC

17

2019-04-17 15:00:37.057 UTC

2016-07-20 14:23:30.447 UTC

null

6,357,360

null

1,423,007

null

1

60

c#|asp.net

133,119

I fixed this issue. As I'm using <code>UpdatePanel</code>, I added below code in the <code>Page_Load</code> event of the page and it worked for me: <pre><code>protected void Page_Load(object sender, EventArgs e) { ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page); scriptManager.RegisterPostBackControl(this.btnExcelExport); //Further code goes here.... } </code></pre>

10,995,294

border-radius not working

I'm working on a basic <code>div</code> and for some peculiar reason, <code>border-radius: 7px</code> isn't applying to it. <pre><code>.panel { float: right; width: 120px; height: auto; background: #fff; border-radius: 7px; // not working } </code></pre>

30,584,574

12

1

null

2012-06-12 10:58:15.61 UTC

16

2021-05-13 13:25:20.08 UTC

2017-02-19 20:48:02.907 UTC

null

3,885,376

null

473,213

null

1

88

css|border

183,758

To whomever may have this issue. My problem was border-collapse. It was set to: <pre><code>border-collapse: collapse; </code></pre> I set it to: <pre><code>border-collapse: separate; </code></pre> and it fixed the issue.

11,063,102

Using Locales with Java's toLowerCase() and toUpperCase()

I wanted code to convert all the characters in strings to uppercase or lowercase in Java. I found a method that goes something like this: <pre><code>public static String changelowertoupper() { String str = "CyBeRdRaGoN"; str=str.toLowerCase(Locale.ENGLISH); return str; } </code></pre> Now I've read that using certain <code>Locale</code>s, like Turkish, "returns i (without dot) instead of i (with dot)." Is it safe to use <code>Locale</code>s like UK, US, ENGLISH, etc.? Are there any big differences between them when applied to strings? Which is the most preferred <code>Locale</code> for <code>String</code>s?

11,063,161

6

4

null

2012-06-16 11:40:48.933 UTC

13

2021-07-14 16:11:18.547 UTC

2014-01-07 13:49:30.353 UTC

null

1,737,819

null

1,456,914

null

1

93

java|string|locale

116,523

I think you should use locale , <blockquote> For instance, "TITLE".toLowerCase() in a Turkish locale returns "tıtle", where 'ı' is the LATIN SMALL LETTER DOTLESS I character. To obtain correct results for locale insensitive strings, use toLowerCase(Locale.ENGLISH). </blockquote> I refer to these links as solution to your problem and it has point to keep in mind in you situation "Turkish" <pre><code>**FROM THE LINKS** </code></pre> <blockquote> toLowerCase() respects internationalization (i18n). It performs the case conversion with respect to your Locale. When you call toLowerCase(), internally toLowerCase(Locale.getDefault()) is getting called. It is locale sensitive and you should not write a logic around it interpreting locale independently. </blockquote> <pre><code>import java.util.Locale; public class ToLocaleTest { public static void main(String[] args) throws Exception { Locale.setDefault(new Locale("lt")); //setting Lithuanian as locale String str = "\u00cc"; System.out.println("Before case conversion is "+str+ " and length is "+str.length());// Ì String lowerCaseStr = str.toLowerCase(); System.out.println("Lower case is "+lowerCaseStr+ " and length is "+lowerCaseStr.length());// iı` } } </code></pre> <blockquote> In the above program, look at the string length before and after conversion. It will be 1 and 3. Yes the length of the string before and after case conversion is different. Your logic will go for a toss when you depend on string length on this scenario. When your program gets executed in a different environment, it may fail. This will be a nice catch in code review. To make it safer, you may use another method toLowerCase(Locale.English) and override the locale to English always. But then you are not internationalized. So the crux is, toLowerCase() is locale specific. </blockquote> <a href="http://lotusnotus.com/lotusnotus_en.nsf/dx/dotless-i-tolowercase-and-touppercase-functions-use-responsibly.htm" rel="noreferrer">reference 1</a> <a href="https://stackoverflow.com/questions/1190254/tolowercase-with-special-unicode-characters-throws-exception">reference 2</a> <a href="http://javapapers.com/core-java/javas-tolowercase-has-got-a-surprise-for-you/" rel="noreferrer">reference 3</a> Dotless-i, is a lowercase 'i' without dot. The uppercase of this character is the usual "I". There is another character, "I with dot". The lowercase of this character is the usual lowercase "i". Have you noticed the problem? This unsymetrical conversion causes a serious problem in programming. We face this problem mostly in Java applications because of (IMHO) poor implementation of toLowerCase and toUpperCase functions. In Java, String.toLowerCase() method converts characters to lowercase according to the default locale. This causes problems if your application works in Turkish locale and especially if you are using this function for a file name or a url that must obey a certain character set. I have blogged about two serious examples before: The compile errors with Script libraries with "i" in their names and XSP Manager's fault if an XPage is in a database with "I" in its name. There is a long history, as I said. For instance in some R7 version, router was unable to send a message to a recipient if his/her name starts with "I". Message reporting agents was not running in Turkish locale until R8. Anyone with Turkish locale could not install Lotus Notes 8.5.1 (it's real!). The list goes on... There is almost no beta tester from Turkey and customers don't open PMR for these problems. So these problems are not going up to the first priority for development teams. Even Java team has added a special warning to the latest documentation: <blockquote> This method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently. Examples are programming language identifiers, protocol keys, and HTML tags. For instance, "TITLE".toLowerCase() in a Turkish locale returns "tıtle", where 'ı' is the LATIN SMALL LETTER DOTLESS I character. To obtain correct results for locale insensitive strings, use toLowerCase(Locale.ENGLISH). </blockquote>

12,758,425

how to set the output image use com.android.camera.action.CROP

I have code to crop an image, like this : <pre><code>public void doCrop(){ Intent intent = new Intent("com.android.camera.action.CROP"); intent.setType("image/"); List<ResolveInfo> list = getPackageManager().queryIntentActivities(intent,0); int size = list.size(); if (size == 0 ){ Toast.makeText(this, "Cant find crop app").show(); return; } else{ intent.setData(selectImageUri); intent.putExtra("outputX", 300); intent.putExtra("outputY", 300); intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); intent.putExtra("scale", true); intent.putExtra("return-data", true); if (size == 1) { Intent i = new Intent(intent); ResolveInfo res = list.get(0); i.setComponent(new ComponentName(res.activityInfo.packageName, res.activityInfo.name)); startActivityForResult(i, CROP_RESULT); } } } public void onActivityResult (int requestCode, int resultCode, Intent dara){ if (resultCode == RESULT_OK){ if (requestCode == CROP_RESULT){ Bundle extras = data.getExtras(); if (extras != null){ bmp = extras.getParcelable("data"); } File f = new File(selectImageUri.getPath()); if (f.exists()) f.delete(); Intent inten3 = new Intent(this, tabActivity.class); startActivity(inten3); } } } </code></pre> from what i have read, the code <code>intent.putExtra("outputX", 300); intent.putExtra("outputY", 300);</code> is use to set the resolution of crop result, but why i can't get the result image resolution higer than 300x300? when I set the <code>intent.putExtra("outputX", 800); intent.putExtra("outputY", 800);</code> the crop function has no result or crash, any idea for this situation? the log cat say "! ! ! FAILED BINDER TRANSACTION ! ! !

12,758,776

2

null

2012-10-06 09:19:24.56 UTC

12

2014-12-17 12:02:36.437 UTC

null

3,748,302

null

1,247,026

null

1

9

android|image|image-processing|crop

29,843

That Intent is not part of the public Android API and is not guaranteed to work on all devices. It was used in earlier versions of android 1.x and 2.x but it's not used anymore and is not recommended. That is probably why it's crashing all over the palce or working improperly. Use methods such as <code>Bitmap.createBitmap(..)</code> or <code>Bitmap.createScaledBitmap(..)</code> to create a resized or cropped version of your original image. These are part of the Android API and are guaranteed to work. See official docs <a href="http://developer.android.com/reference/android/graphics/Bitmap.html#createBitmap%28int,%20int,%20android.graphics.Bitmap.Config%29" rel="nofollow noreferrer">here</a> and <a href="http://developer.android.com/reference/android/graphics/Bitmap.html#createScaledBitmap%28android.graphics.Bitmap,%20int,%20int,%20boolean%29" rel="nofollow noreferrer">here</a> To crop a bitmap, you can use <code>Bitmap.createBitmap(Bitmap, int x, int y, int width, int height)</code>. For example, if you need to crop 10 pixels from each side of a bitmap then use this: <pre><code>Bitmap croppedBitmap = Bitmap.createBitmap(originalBitmap, 10, 10, originalBitmap.getWidth() - 20, originalBitmap.getHeight() - 20); </code></pre> If you need to show the selector to the user. Then you can do something like this: <pre><code>private static final String TEMP_PHOTO_FILE = "temporary_holder.jpg"; Intent photoPickerIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); photoPickerIntent.setType("image/*"); photoPickerIntent.putExtra("crop", "true"); photoPickerIntent.putExtra(MediaStore.EXTRA_OUTPUT, getTempUri()); photoPickerIntent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString()); startActivityForResult(photoPickerIntent, REQ_CODE_PICK_IMAGE); private Uri getTempUri() { return Uri.fromFile(getTempFile()); } private File getTempFile() { if (isSDCARDMounted()) { File f = new File(Environment.getExternalStorageDirectory(),TEMP_PHOTO_FILE); try { f.createNewFile(); } catch (IOException e) { } return f; } else { return null; } } private boolean isSDCARDMounted(){ String status = Environment.getExternalStorageState(); if (status.equals(Environment.MEDIA_MOUNTED)) return true; return false; } protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) { super.onActivityResult(requestCode, resultCode, imageReturnedIntent); switch (requestCode) { case REQ_CODE_PICK_IMAGE: if (resultCode == RESULT_OK) { if (imageReturnedIntent!=null){ File tempFile = getTempFile(); String filePath= Environment.getExternalStorageDirectory() + "/temporary_holder.jpg"; System.out.println("path "+filePath); Bitmap selectedImage = BitmapFactory.decodeFile(filePath); _image = (ImageView) findViewById(R.id.image); _image.setImageBitmap(selectedImage ); } } } </code></pre> code from <a href="https://stackoverflow.com/questions/2085003/how-to-select-and-crop-an-image-in-android">here</a>

13,098,960

Convert ArrayList of Integer Objects to an int array?

<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/718554/how-to-convert-an-arraylist-containing-integers-to-primitive-int-array">How to convert an ArrayList containing Integers to primitive int array?</a> </blockquote> I tried the code below, but it does not work. Do I have to make a loop copy the <code>ArrayList</code> into an array ? <pre><code>int[]intArray = (int[]) integerArrayList.toArray(); </code></pre>

13,098,980

4

1

null

2012-10-27 09:42:47.193 UTC

7

2014-04-07 13:23:20.33 UTC

2017-05-23 11:47:00.513 UTC

null

-1

null

1,776,310

null

1

15

java|arrays|arraylist

72,972

If you want primitive type array, you can use <a href="http://commons.apache.org/lang/"><code>Apache Commons</code></a> <a href="http://commons.apache.org/lang/api-2.5/org/apache/commons/lang/ArrayUtils.html#toPrimitive%28java.lang.Short%5b%5d%29"><code>ArrayUtils#toPrimitive</code></a> method to get primitive array from wrapper array: - <pre><code>public static int[] toPrimitive(Integer[] array) </code></pre> You can use it like this: - <pre><code>int[] arr = ArrayUtils.toPrimitive((Integer[])integerArrayList.toArray()); </code></pre> Or, you can use the 1-arg version of toArray method, that takes an array and returns the array of that type only. That way, you won't have to the typecasting. <pre><code>List<Integer> myList = new ArrayList<Integer>(); Integer[] wrapperArr = myList.toArray(new Integer[myList.size()]); // If you want a `primitive` type array int[] arr = ArrayUtils.toPrimitive(wrapperArr); </code></pre> <hr> However, if you are Ok with the <code>wrapper type</code> array (Which certainly will not trouble you), then you don't need to do that last step. <hr> Also, you can also create a primitive array, without having to create that intermediate Wrapper type array. For that you would have to write it through <code>loop</code>: - <pre><code>int[] arr = new int[myList.size()]; for(int i = 0; i < myList.size(); i++) { if (myList.get(i) != null) { arr[i] = myList.get(i); } } </code></pre>

12,856,471

c# search string in txt file

I want to find a string in a txt file if string compares, it should go on reading lines till another string which I'm using as parameter. Example: <pre class="lang-none prettyprint-override"><code>CustomerEN //search for this string ... some text which has details about the customer id "123456" username "rootuser" ... CustomerCh //get text till this string </code></pre> I need the details to work with them otherwise. I'm using linq to search for "CustomerEN" like this: <pre><code>File.ReadLines(pathToTextFile).Any(line => line.Contains("CustomerEN")) </code></pre> But now I'm stuck with reading lines (data) till "CustomerCh" to extract details.

12,856,666

5

0

null

2012-10-12 09:51:58.467 UTC

7

2020-11-11 08:14:32.713 UTC

null

3,082,718

null

425,247

null

1

25

c#|string|file-io

152,371

If your pair of lines will only appear once in your file, you could use <pre><code>File.ReadLines(pathToTextFile) .SkipWhile(line => !line.Contains("CustomerEN")) .Skip(1) // optional .TakeWhile(line => !line.Contains("CustomerCh")); </code></pre> If you could have multiple occurrences in one file, you're probably better off using a regular <code>foreach</code> loop - reading lines, keeping track of whether you're currently inside or outside a customer etc: <pre><code>List<List<string>> groups = new List<List<string>>(); List<string> current = null; foreach (var line in File.ReadAllLines(pathToFile)) { if (line.Contains("CustomerEN") && current == null) current = new List<string>(); else if (line.Contains("CustomerCh") && current != null) { groups.Add(current); current = null; } if (current != null) current.Add(line); } </code></pre>

13,137,766

Why isn't std::string::max_size a compile-time constant?

<code>std::string</code> provides a <code>max_size()</code> method to determine the maximum number of elements it can contain. However, to work out the maximum length of a string in general, the programmer has to create a (possibly empty) string object. If this class doesn't need any information from the programmer, why isn't <code>max_size()</code> available as a compile-time constant ? Is there some kind of runtime information necessary for a string to work out its maximum size ?

13,139,088

4

null

2012-10-30 11:11:59.443 UTC

2

2012-10-31 21:10:59.843 UTC

null

361,535

null

1

34

c++|string|compile-time-constant

2,851

One reason is that the <code>max_size</code> function isn't very useful at all, and the committee doesn't think it is worth the trouble to try to fix it. So it is just left the way it is, because it is part of the documented interface. See library defect report #197: <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3440.html#197" rel="noreferrer">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3440.html#197</a> <blockquote> max_size() isn't useful for very many things, and the existing wording is sufficiently clear for the few cases that max_size() can be used for. None of the attempts to change the existing wording were an improvement. </blockquote>

12,720,450

Unpacking arguments: only named arguments may follow *expression

The following works beautifully in Python: <pre><code>def f(x,y,z): return [x,y,z] a=[1,2] f(3,*a) </code></pre> The elements of <code>a</code> get unpacked as if you had called it like <code>f(3,1,2)</code> and it returns <code>[3,1,2]</code>. Wonderful! But I can't unpack the elements of <code>a</code> into the first two arguments: <pre><code>f(*a,3) </code></pre> Instead of calling that like <code>f(1,2,3)</code>, I get "SyntaxError: only named arguments may follow *expression". I'm just wondering why it has to be that way and if there's any clever trick I might not be aware of for unpacking arrays into arbitrary parts of argument lists without resorting to temporary variables.

12,830,036

6

1

null

2012-10-04 04:52:37.99 UTC

5

2018-02-03 23:58:15.643 UTC

null

4,234

null

1

47

python|arrays|arguments

27,198

As Raymond Hettinger's answer points out, this <s>may change</s> has changed in Python 3 and <a href="http://www.python.org/dev/peps/pep-3132/" rel="noreferrer">here is a related proposal</a>, which has been accepted. Especially related to the current question, here's one of the possible changes to that proposal that was discussed: <blockquote> Only allow a starred expression as the last item in the exprlist. This would simplify the unpacking code a bit and allow for the starred expression to be assigned an iterator. This behavior was rejected because it would be too surprising. </blockquote> So there are implementation reasons for the restriction with unpacking function arguments but it is indeed a little surprising! In the meantime, here's the workaround I was looking for, kind of obvious in retrospect: <pre><code>f(*(a+[3])) </code></pre>

12,795,935

Checkstyle Eclipse plugin doesn't work

I'm using eclipse checkstyle plugin with Juno Eclipse distribution. Anytime the code is checked for checkstyle error I get the following error: <pre><code>cannot initialize module TreeWalker - Unable to instantiate DoubleCheckedLocking </code></pre> Does anybody know how to fix this problem? Is it a plugin compatibility issue or something else?

12,798,807

4

0

null

2012-10-09 08:32:58.027 UTC

5

2016-05-06 08:46:52.097 UTC

null

452,775

null

859,314

null

1

57

eclipse|eclipse-plugin|checkstyle

33,608

The DoubleCheckedLocking check has been removed in Checkstyle 5.6 and must be manually removed from your Checkstyle configuration. See also: <a href="http://sourceforge.net/tracker/index.php?func=detail&aid=3571442&group_id=29721&atid=397078" rel="noreferrer">http://sourceforge.net/tracker/index.php?func=detail&aid=3571442&group_id=29721&atid=397078</a>

13,032,948

How to create and handle composite primary key in JPA

I want to have versions from the same data entry. In other words, I want to duplicate the entry with another version number. <code>id - Version</code> will be the primary key. How should the entity look like? How can I duplicate it with another version? <pre><code>id Version ColumnA 1 0 Some data 1 1 Some Other data 2 0 Data 2. Entry 2 1 Data </code></pre>

13,033,039

4

1

null

2012-10-23 14:37:38.54 UTC

38

2017-12-15 21:09:36.603 UTC

null

1,454,671

null

643,271

null

1

123

java|jakarta-ee|jpa|composite-primary-key

201,116

You can make an <code>Embedded class</code>, which contains your two keys, and then have a reference to that class as <code>EmbeddedId</code> in your <code>Entity</code>. You would need the <a href="https://docs.oracle.com/javaee/6/api/javax/persistence/EmbeddedId.html"><code>@EmbeddedId</code></a> and <a href="https://docs.oracle.com/javaee/6/api/javax/persistence/Embeddable.html"><code>@Embeddable</code></a> annotations. <pre><code>@Entity public class YourEntity { @EmbeddedId private MyKey myKey; @Column(name = "ColumnA") private String columnA; /** Your getters and setters **/ } </code></pre> <pre><code>@Embeddable public class MyKey implements Serializable { @Column(name = "Id", nullable = false) private int id; @Column(name = "Version", nullable = false) private int version; /** getters and setters **/ } </code></pre> <hr> Another way to achieve this task is to use <code>@IdClass</code> annotation, and place both your <code>id</code> in that <code>IdClass</code>. Now you can use normal <code>@Id</code> annotation on both the attributes <pre><code>@Entity @IdClass(MyKey.class) public class YourEntity { @Id private int id; @Id private int version; } </code></pre> <pre><code>public class MyKey implements Serializable { private int id; private int version; } </code></pre>

13,222,671

Why are flag enums usually defined with hexadecimal values

A lot of times I see flag enum declarations that use hexadecimal values. For example: <pre class="lang-cs prettyprint-override"><code>[Flags] public enum MyEnum { None = 0x0, Flag1 = 0x1, Flag2 = 0x2, Flag3 = 0x4, Flag4 = 0x8, Flag5 = 0x10 } </code></pre> When I declare an enum, I usually declare it like this: <pre class="lang-cs prettyprint-override"><code>[Flags] public enum MyEnum { None = 0, Flag1 = 1, Flag2 = 2, Flag3 = 4, Flag4 = 8, Flag5 = 16 } </code></pre> Is there a reason or rationale to why some people choose to write the value in hexadecimal rather than decimal? The way I see it, it's easier to get confused when using hex values and accidentally write <code>Flag5 = 0x16</code> instead of <code>Flag5 = 0x10</code>.

13,222,740

7

6

null

2012-11-04 20:39:49.863 UTC

39

2022-07-26 08:35:13.023 UTC

null

389,966

null

1

134

c#|.net|enums|enum-flags

41,581

Rationales may differ, but an advantage I see is that hexadecimal reminds you: "Okay, we're not dealing with numbers in the arbitrary human-invented world of base ten anymore. We're dealing with bits - the machine's world - and we're gonna play by its rules." Hexadecimal is rarely used unless you're dealing with relatively low-level topics where the memory layout of data matters. Using it hints at the fact that that's the situation we're in now. Also, i'm not sure about C#, but I know that in C <code>x << y</code> is a valid compile-time constant. Using bit shifts seems the most clear: <pre class="lang-cs prettyprint-override"><code>[Flags] public enum MyEnum { None = 0, Flag1 = 1 << 0, //1 Flag2 = 1 << 1, //2 Flag3 = 1 << 2, //4 Flag4 = 1 << 3, //8 Flag5 = 1 << 4 //16 } </code></pre>

11,093,943

Is it possible to make a div 50px less than 100% in CSS3?

Is it possible to make a <code>div</code> 50px less than 100% in pure CSS? I want the <code><div></code> to be only 50px less than 100%. I don't want any JavaScript.

11,093,944

6

4

null

2012-06-19 03:18:52.41 UTC

85

2013-04-18 02:58:03.713 UTC

2012-06-21 15:05:26.023 UTC

null

50,776

null

283,863

null

1

228

html|css

42,186

Yes you can. Without using the IE's <code>expression()</code>, you can do that in CSS3 by using <a href="http://www.w3.org/TR/css3-values/#calc" rel="noreferrer"><code>calc()</code></a>. <pre class="lang-css prettyprint-override"><code>div { width: 100%; width: -webkit-calc(100% - 50px); width: -moz-calc(100% - 50px); width: calc(100% - 50px); } </code></pre> Demo: <a href="http://jsfiddle.net/thirtydot/Nw3yd/66/" rel="noreferrer">http://jsfiddle.net/thirtydot/Nw3yd/66/</a> This will make your life so much easier. It is currently supported in the 3 main browsers: Firefox, Google Chrome (WebKit), and IE9: <a href="http://caniuse.com/calc" rel="noreferrer">http://caniuse.com/calc</a> MDN: <a href="https://developer.mozilla.org/en/CSS/-moz-calc" rel="noreferrer">https://developer.mozilla.org/en/CSS/-moz-calc</a>

16,993,904

Android - Setting TextView to Bold Not Working

Here is the XML: <pre><code><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/modal_list_row" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingBottom="7.5dp" android:orientation="vertical" > <TextView android:id="@+id/title_text_view" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:gravity="center" android:text="@string/alert_title_small" android:textColor="@color/alert_dialog_text_color" android:textSize="@dimen/alert_dialog_title_font_size" android:textStyle="bold" /> </RelativeLayout> </code></pre> Although the Graphical Layout shows bold text, on the device it's not. Is it a device thing or what? Update: For people who keeps on asking for the ful XML, here it is updated. A simple relative layout. And here is the Java Code: <pre><code>this.titleTextView.setText(this.modalListState.title); </code></pre> Things to think about: Could it be due to the device typefaces? Does anyone have Galaxy S3 to confirm? Could it be the activity style? Here is the one used for the whole app: <pre><code><resources xmlns:android="http://schemas.android.com/apk/res/android">  <style name="AppBaseTheme" parent="android:Theme.Light">  </style>  <style name="AppTheme" parent="AppBaseTheme">  </style> <style name="TransparentActivity" > <item name="android:windowBackground">@android:color/transparent</item> <item name="android:colorBackgroundCacheHint">@null</item> <item name="android:windowIsTranslucent">true</item> <item name="android:windowAnimationStyle">@android:style/Animation</item> <item name="android:windowNoTitle">true</item> <item name="android:windowContentOverlay">@null</item> <item name="android:windowFullscreen">false</item> </style> </code></pre> The TransparentActivity style is used for the concerned activity.

17,063,538

10

7

null

2013-06-07 22:32:45.38 UTC

3

2018-04-13 07:46:57.92 UTC

2013-06-12 10:22:23.983 UTC

null

1,149,647

null

1,149,647

null

1

32

android|textview

28,609

Well, I found a silly answer to this problem. I was using a custom font on the device, not the default one. Once I switched to the default one, every things worked as expected!

16,786,555

Eclipse compiles successfully but still gives semantic errors

NOTE: it apparently is a recurrent question on StackOverflow, but - for what I have seen - either people never find a way or their solution does not work for me <h1>The problem:</h1> I am using Eclipse Juno ADT. Everything was working fine until I tried to update the NDK. I replaced my <code>ndk</code> folder (that was the <code>ndk-r8d</code>) by the new version (i.e. <code>ndk-r8e</code>) and, in my <code>Paths and Symbols</code> configuration, I changed the includes to go from g++ 4.6 to 4.7. It seemed to break my index: I could compile my code, but Eclipse was giving semantic errors, exactly like in [<a href="https://stackoverflow.com/questions/15612673/eclipse-cdt-displays-semantic-error-but-builds-successfully">1</a>] and [<a href="https://stackoverflow.com/questions/10103465/eclipse-cdt-complains-about-unresolved-functions-but-still-builds-successfully">2</a>]. The errors mainly come from symbol used by OpenCV4Android, such as <code>distance</code>, <code>pt</code>, <code>queryIdx</code> and <code>trainIdx</code>. When I tried to backup to my old configuration, the index was still broken! I cannot find a way to change this. <hr> <h1>What I have tried</h1> <ul> <li>Clean up the project</li> <li>Rebuild, refresh, and all the other options in the "Index" submenu (when "right-clicking" on the project)</li> <li>Disable / enable the indexer in the preferences</li> <li>Verify that symbols such as <code>trainIdx</code> only appear in my OpenCV4Android include in the <code>Paths and Symbols</code> section.</li> <li>Change the order of my includes in the <code>Paths and Symbols</code> section. I basically tried to put the OpenCV include in the beginning and in the end.</li> </ul> <hr> <h1>Some observations</h1> <h2>What is not working</h2> I assume that it is the CDT index because of the following: <ul> <li>In command line, I can build my project using <code>ndk-build clean</code> and <code>ndk-build</code>.</li> <li>When I start Eclipse, I have no error until I open a C++ file (from the <code>jni</code> folder).</li> <li>I can always build the project, but as long as I have opened a C++ file, I can't run the application anymore because of a lot of <code>Field '<name>' could not be resolved.</code></li> <li>If I don't open the C++ files, Eclipse doesn't report any error and can build and deploy the Android application successfully.</li> </ul> <h2>Interesting fact</h2> The following code reports errors on <code>line</code>, <code>queryIdx</code>, <code>pt</code>: <pre><code>cv::line(mRgb, keypointsA[matches[i].queryIdx].pt, keypointsB[matches[i].trainIdx].pt, cv::Scalar(255, 0, 0, 255), 1, 8, 0); </code></pre> If I write it as follows, it works: <pre><code>cv::DMatch tmpMatch = matches[i]; cv::KeyPoint queryKp = keypointsA[tmpMatch.queryIdx]; cv::KeyPoint trainKp = keypointsB[tmpMatch.trainIdx]; cv::line(mRgb, queryKp.pt, trainKp.pt, cv::Scalar(255, 0, 0, 255), 1, 8, 0); </code></pre> It is not that all of the OpenCV functions are unresolved: only <code>pt</code>, <code>queryIdx</code> and <code>trainIdx</code> are. Any comment will be really appreciated.

16,891,713

8

3

null

2013-05-28 07:46:16.813 UTC

15

2016-07-19 10:42:25.893 UTC

2017-05-23 10:31:16.803 UTC

null

-1

null

1,368,342

null

1

38

android|c++|eclipse|opencv|android-ndk

21,881

In your selected project preferences within the Eclipse environment, go to C/C++ General -> Code Analysis -> Launching. Make sure that both check boxes are unchecked. Close and reopen the project or restart eclipse and rebuild the project.

16,855,680

Are there any drawbacks to using localStorage instead of Cookies?

On my previous websites, I used to use a cookie to display a pre-home page only on the first visit. That worked great (<a href="http://newyork.arte.tv/" rel="noreferrer">see for example here</a>), but using cookies is not so trendy today, so I want to avoid it as much as possible. Now, my new website projects almost always have pre-home launched via javascript (showing a modalbox), so I don't need to do any action on the server side. I'm considering to use HTML5 localStorage instead of cookies, with a fallback on cookies if the browser does not have localStorage. Is this a good idea? What is the impact in terms of usability, privacy protection and website performance? Using localStorage will improve usability for users that have disabled cookies. But I know that some HTML5 features are only opt-in (like geolocalisation) in some browser. Is there any restriction like that for localStorage on any browser ? Is there any case where I will get a JS error if localStorage is available but deactivated for my site ?

16,855,902

5

0

null

2013-05-31 10:57:31.893 UTC

14

2022-08-30 00:04:31.677 UTC

2013-05-31 14:19:40.827 UTC

null

1,472,001

null

1,472,001

null

1

59

javascript|html|cookies|local-storage

36,684

<h2>Usability</h2> The user will not know if you are using localStorage or a cookie. If a user disable cookies, localStorage will not work either. <h2>Performance</h2> There is no noticeable speed difference between the two methods. <h2>sessionStorage</h2> sessionStorage is only for that browser tab's session. If you close the tab, the session will be lost and the data will be lost too, it's similar to a session variable on any backend language. <h2>localStorage</h2> localStorage will be available for any tab or window in the browser, and will exist until it is deleted by the user or the program. Unlike a cookie, you cannot setup expiration. localStorage has a much larger storage limit as well. <h2>Your Questions</h2> <ol> <li>You are not using this data server side, so you don't need a cookie. localStorage is never sent to the server unlike a cookie.</li> <li>If the user disables the cookies, localStorage will not work either.</li> </ol> <h2>Fallback Example</h2> You can use a Modernizr to verify if localStorage is available and if not, use store a cookie instead. <pre><code>if (Modernizr.localstorage) { // supports HTML5 Storage :D } else { // does not support HTML5 Storage :( } </code></pre> You can also forego Modernizr and use the check <code>typeof Storage !== 'undefined'</code>.

16,789,776

iterating over two values of a list at a time in python

I have a set like (669256.02, 6117662.09, 669258.61, 6117664.39, 669258.05, 6117665.08) which I need to iterate over, like <pre><code> for x,y in (669256.02, 6117662.09, 669258.61, 6117664.39, 669258.05, 6117665.08) print (x,y) </code></pre> which would print <pre><code> 669256.02 6117662.09 669258.61 6117664.39 669258.05 6117665.08 </code></pre> im on Python 3.3 btw

16,789,817

3

null

2013-05-28 10:30:17.837 UTC

14

2019-10-30 00:17:20.73 UTC

2016-02-16 23:26:10.78 UTC

null

1,454,176

null

2,237,804

null

1

68

python|list

59,170

You can use an iterator: <pre><code>>>> lis = (669256.02, 6117662.09, 669258.61, 6117664.39, 669258.05, 6117665.08) >>> it = iter(lis) >>> for x in it: ... print (x, next(it)) ... 669256.02 6117662.09 669258.61 6117664.39 669258.05 6117665.08 </code></pre>

17,106,288

matplotlib.pyplot will not forget previous plots - how can I flush/refresh?

How do you get <code>matplotlib.pyplot</code> to "forget" previous plots I am trying to plot multiple time using <code>matplotlib.pyplot</code> The code looks like this: <pre><code>def plottest(): import numpy as np import matplotlib.pyplot as plt a=np.random.rand(10,) b=np.random.rand(10,) c=np.random.rand(10,) plt.plot(a,label='a') plt.plot(b,label='b') plt.plot(c,label='c') plt.legend(loc='upper left') plt.ylabel('mag') plt.xlabel('element)') plt.show() e=np.random.rand(10,) f=np.random.rand(10,) g=np.random.rand(10,) plt.plot(e,label='e') plt.plot(f,label='f') plt.plot(g,label='g') plt.legend(loc='upper left') plt.ylabel('mag') plt.xlabel('element)') plt.show() </code></pre> Unfortunately I keep getting the same plot (actually from some other code which I ran and completed a while ago) no matter what I do. Similar code has worked previously for me. I have looked at these questions: <a href="https://stackoverflow.com/questions/10819363/how-to-clean-the-slate">How to "clean the slate"?</a> <a href="https://stackoverflow.com/questions/5158447/matplotlib-pyplot-show-doesnt-work-once-closed?rq=1">Matplotlib pyplot show() doesn't work once closed</a> <a href="https://stackoverflow.com/questions/6187603/python-matplotlib-pyplot-show-blocking-or-not">(python) matplotlib pyplot show() .. blocking or not?</a> and tried using <code>plt.show()</code>, <code>plt.clf()</code> and <code>plt.close</code> to no avail. Any ideas?

17,107,568

2

0

null

2013-06-14 10:21:25.563 UTC

25

2019-02-07 14:52:01.597 UTC

2017-05-23 11:54:39.773 UTC

null

-1

null

1,461,850

null

1

103

python|matplotlib

134,772

I would rather use <code>plt.clf()</code> after every <code>plt.show()</code> to just clear the current figure instead of closing and reopening it, keeping the window size and giving you a better performance and much better memory usage. Similarly, you could do <code>plt.cla()</code> to just clear the current <a href="https://matplotlib.org/api/axes_api.html" rel="noreferrer">axes</a>. To clear a specific <a href="https://matplotlib.org/api/axes_api.html" rel="noreferrer">axes</a>, useful when you have multiple axes within one figure, you could do for example: <pre><code>fig, axes = plt.subplots(nrows=2, ncols=2) axes[0, 1].clear() </code></pre>

20,870,895

How to diagnose and fix git fatal: unable to read tree

I'm using <code>git</code> to manage files on a project, and keep running into this problem. When I run <code>git status</code> I get the message <pre><code>fatal: unable to read tree e2d920161d41631066945a3cbcd1b043de919570 </code></pre> As I understand it, I should check the output of <code>git fsck</code>, and I receive <pre><code>broken link from tree e09a42f248afff64336fbbec2523df97c26451ac to tree e2d920161d41631066945a3cbcd1b043de919570 broken link from tree e09a42f248afff64336fbbec2523df97c26451ac to tree 9b0dd389bd7f9e8d257395d57e0881b7957f9698 broken link from tree e09a42f248afff64336fbbec2523df97c26451ac to tree 9e288a4ad60d63f342dfd18237980674426aa725 broken link from tree e09a42f248afff64336fbbec2523df97c26451ac to tree 2a04647337089f554fab8c49cfd37149e5f4fc9f broken link from tree e09a42f248afff64336fbbec2523df97c26451ac to tree ea16658b45ce961adc3c3f519b0e8d9672918ca8 </code></pre> together with a lot of <code>missing blob</code> messages. Following various resources (e.g <a href="https://stackoverflow.com/questions/16955523/git-broken-links-missing-dangling-trees">Git - Broken Links, Missing & Dangling Trees</a>) I have simply re-cloned the project from <code>github</code> and started again. Once I have re-cloned the project, all is good for a few <code>commit</code>s, and then the problem arises again. Re-cloning every time doesn't seem to be optimal, and seems to go against the idea of using <code>git</code>, and I'd like to try and understand what is going on. How can I diagnose and fix this problem?

20,918,469

6

9

null

2014-01-01 16:54:48.52 UTC

14

2022-02-24 08:55:42.35 UTC

2017-05-23 12:10:35.467 UTC

null

-1

null

1,091,649

null

1

70

git

109,816

Following my <a href="https://stackoverflow.com/a/1507935/6309">older recommendation</a>, it boils down to being able to find a repo which actually contains the missing elements (here full trees). This is what is shown in "<a href="https://stackoverflow.com/a/18687206/6309">How to fix corrupted git repository?</a>". But if a full clone doesn't solve the problem, then it may be: <ul> <li>a corruption of the repo on the GitHub side (contact GitHub support to check).</li> <li>some kind of corruption on the client side (your Ubuntu). Make sure to check if the issue persists with the <a href="https://launchpad.net/~git-core/+archive/ppa" rel="noreferrer">latest Git release</a> (1.8.5.2-1) from a <a href="https://launchpad.net/+help-soyuz/ppa-sources-list.html" rel="noreferrer">custom PPA (Personal Package Archive)</a>.</li> </ul> <hr> Update July 2016, with Git 2.10 soon to be release, you now have: <pre><code>git fsck --name-objects </code></pre> See "<a href="https://stackoverflow.com/a/38598015/6309">How to fix git error broken link from tree to tree?</a>" for more.

4,380,159

Writing a Windows NT subsystem

I'd like to try writing my own minimal NT subsystem on Windows 7 for purely educational purposes -- something like a bare-bones equivalent of the posix.exe in Microsoft's Subsystem for Unix-based Applications. But I can't seem to find any public documentation on this topic. What API does a subsystem need to implement? How does it get registered with Windows? How does the subsystem image need to be built (what flags need to be set in the PE header, etc.)? I'd most like to find a book or web site with an overview of the entire subject, or even the source code for a "hello world" NT subsystem that someone else has written. But anything at all would be appreciated if you can point me in the right direction here...

4,653,425

2

22

null

2010-12-07 18:23:22.767 UTC

18

2012-05-18 21:59:13.783 UTC

null

21,234

null

40,511

null

1

51

windows|subsystem|windows-nt

4,306

Here are the major components of a subsystem: <ul> <li>User-mode server. The server creates a (A)LPC port and listens for and handles client requests.</li> <li>User-mode client DLL. In the DLL_INIT_ROUTINE, you can connect to the port set up by the server. This DLL will expose your subsystem's API, and some functions will require communication with the server.</li> <li>Kernel-mode support driver (you might not need this).</li> </ul> You will want to store process or thread state in either your server or driver. If you're storing it in the server, you might need something like <code>NtRegisterThreadTerminatePort</code> to ensure you get to clean up when a process or thread exits. If you're using a driver, you need <a href="http://msdn.microsoft.com/en-us/library/ff559951.aspx" rel="noreferrer">PsSetCreateProcessNotifyRoutine</a>. And lastly, if you're on XP and below, you can add new system calls. You can do this by calling <code>KeAddSystemServiceTable</code>. To invoke the system calls from user-mode, you need to create stubs like this (for x86): <pre><code>; XyzCreateFooBar(__out PHANDLE FooBarHandle, __in ACCESS_MASK DesiredAccess, ...) mov eax, SYSTEM_CALL_NUMBER mov edx, 0x7ffe0300 call [edx] retn 4 </code></pre> On Vista and above you can no longer add new system service tables because there is only room for two: the kernel's system calls and win32k's system calls. After a bit of Googling I found this: <a href="http://winntposix.sourceforge.net/" rel="noreferrer">http://winntposix.sourceforge.net/</a>. I think it's very similar to what you're looking for, and uses a lot of the things I have mentioned.

4,316,710

String.replaceAll without RegEx

I'd like to replace all instances of a substring in a string but <code>String.replaceAll()</code> only accepts a pattern. The string that I have came from a previous match. Is it possible to add escapes to the pattern that I have or is there a version of <code>replaceAll()</code> in another class which accepts a literal string instead of a pattern?

4,316,725

2

1

null

2010-11-30 17:42:49.377 UTC

14

2021-04-22 17:01:02.49 UTC

2012-11-26 14:46:13.373 UTC

null

1,419,007

null

271,599

null

1

132

java

73,703

Just use <a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html#replace%28java.lang.CharSequence,%20java.lang.CharSequence%29" rel="noreferrer"><code>String.replace(CharSequence,CharSequence)</code></a> rather than <code>replaceAll</code>. NB: <code>replace</code> doesn't just replace the first occurrence, it replaces all occurrences, like <code>replaceAll</code>.

9,986,795

CSS Selector for a TD in a Table with an ID

I have an html table with an ID of <code>thetable</code>. It has (according to FireBug), an unnamed TBODY tag, and an unnamed TR tag. The three TD tags inside that I want to access are unnamed. Is there any CSS selector that I can use to reference these unnamed tr tags? I've tried: <code>table#thetable:nth-child(1)</code> But this does not select for those tags. I'm using <a href="http://www.jsoup.org" rel="noreferrer">jsoup.org</a> to pull this data into strings. I'd like to take the text of each TD in the table (of which I know the name) and put all that into an array. Something like this: <pre><code>// Pseudocode for all the TDs into an array Elements strings = doc.select("table#thetable: children"); </code></pre>

9,986,975

3

1

null

2012-04-03 03:42:33.917 UTC

null

2015-07-13 22:45:52.533 UTC

null

445,131

null

1,103,669

null

1

9

java|html|css|css-selectors|jsoup

40,453

If you're simply looking to get all your <code>td</code> elements, this should be enough: <pre><code>Elements elems = doc.select("table#thetable td"); </code></pre> Then iterate <code>elems</code>, retrieve the text from your <code>td</code>s and put them in your array. Also, you should probably use an array list instead of an array if you don't know or can't control how many cells your table will have: <pre><code>Elements elems = doc.select("table#thetable td"); List<String> strings = new ArrayList<String>(); for (Element e : elems) { strings.add(e.text()); } </code></pre>

10,135,074

Download file from HTTPS server using Java

I want to download a file from the server which is using the secured connection protocol HTTPS. I could do it in the normal server, But, how I can do it using the HTTPS. If anyone have used the sample API, please help me to find the useful resources.

10,135,259

4

1

null

2012-04-13 04:03:40.477 UTC

8

2017-12-11 20:34:08.33 UTC

null

421,753

null

1

13

java|network-programming

64,298

Access an HTTPS url with Java is the same then access an HTTP url. You can always use the <pre><code>URL url = new URL("https://hostname:port/file.txt"); URLConnection connection = url.openConnection(); InputStream is = connection.getInputStream(); // .. then download the file </code></pre> But, you can have some problem when the server's certificate chain cannot be validated. So you may need to disable the validation of certificates for testing purposes and trust all certificates. To do that write: <pre><code>// Create a new trust manager that trust all certificates TrustManager[] trustAllCerts = new TrustManager[]{ new X509TrustManager() { public java.security.cert.X509Certificate[] getAcceptedIssuers() { return null; } public void checkClientTrusted( java.security.cert.X509Certificate[] certs, String authType) { } public void checkServerTrusted( java.security.cert.X509Certificate[] certs, String authType) { } } }; // Activate the new trust manager try { SSLContext sc = SSLContext.getInstance("SSL"); sc.init(null, trustAllCerts, new java.security.SecureRandom()); HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory()); } catch (Exception e) { } // And as before now you can use URL and URLConnection URL url = new URL("https://hostname:port/file.txt"); URLConnection connection = url.openConnection(); InputStream is = connection.getInputStream(); // .. then download the file </code></pre>

9,892,356

create interactive elevated process from windows service and show to logged-on user

I have a service that spawns a WPF application process when a user logs on. But for some reason the WPF application gets killed about 10 minutes after it has been created? The termination is immediate with no traces found in the Event Log nor are any normal close/exit events called in the WPF application. In fact, when the termination occurs, Windows 7 seems to hang for a second, the mouse becoming unresponsive and then acting out the mouse gestures after a short delay (when it normalizes, but now lacking the created process). <h3>The When</h3> <pre><code>public partial class Service1 : ServiceBase { public Service1() { InitializeComponent(); CanHandleSessionChangeEvent = true; } protected override void OnSessionChange(SessionChangeDescription changeDescription) { if (changeDescription.Reason == SessionChangeReason.SessionLogon && changeDescription.SessionId > 0) { ApplicationLoader.PROCESS_INFORMATION procInfo; ApplicationLoader.StartProcessAndBypassUAC(@"myapp.exe", out procInfo); } base.OnSessionChange(changeDescription); } } </code></pre> <h3>Process Creation <a href="http://www.codeproject.com/Articles/35773/Subverting-Vista-UAC-in-Both-32-and-64-bit-Archite" rel="noreferrer">As Per Pero Matic Code</a></h3> <pre><code>// ... bool result = CreateProcessAsUser(hUserTokenDup, // client's access token null, // file to execute applicationName, // command line ref sa, // pointer to process SECURITY_ATTRIBUTES ref sa, // pointer to thread SECURITY_ATTRIBUTES false, // handles are not inheritable dwCreationFlags, // creation flags IntPtr.Zero, // pointer to new environment block null, // name of current directory ref si, // pointer to STARTUPINFO structure out procInfo // receives information about new process ); </code></pre> <ul> <li>the termination does not seem to happen if i target notepad.exe, however?</li> <li>tested it with a vanilla\empty WPF application (.NET 4), and that crashed as well</li> </ul> <h3>Process Creation with Administrative Privileges and No Prompt</h3> <ul> <li>It seems that the issue is trying to duplicate the administrative <code>SYSTEM</code> token from <code>winlogon.exe</code> (but which is running in session 1+), because if you duplicate the specific user token instead (e.g. from <code>explorer.exe</code>) then the crashes are no more! </li> <li>this is confirmed with the same vanilla/empty WPF application, and with running <a href="http://social.msdn.microsoft.com/Forums/en-US/csharpgeneral/thread/990e7c4a-afa7-47aa-b9a6-d5b6beb19f41/" rel="noreferrer">Marcel Roma code here</a> - note that he uses <code>explorer.exe</code> instead of <code>winlogon.exe</code></li> <li>although using <code>explorer.exe</code> gets rid of the termination I lose the administrative privileges with that, which does not work for me</li> <li>any ideas how to get it to work with the <code>winlogon</code> process token?</li> <li>or is it possible to adjust the <code>exlorer.exe</code> token to make the duplicate elevated? im guessing somehow using <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa379626%28v=vs.85%29.aspx" rel="noreferrer">TokenElevation</a> and <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa379591%28v=vs.85%29.aspx" rel="noreferrer">SetTokenInformation</a> or <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa375202%28v=vs.85%29.aspx" rel="noreferrer">AdjustTokenPrivileges</a></li> <li>or could it be that <code>Windows 7</code> has been patched to disallow such process impersonation?</li> <li>alternatively, is there any way to get the specific user token with administrative privileges (rather than the owner being <code>SYSTEM</code>), but again, without password knowledge/prompts (excluding <code>CreateProcessWithLogonW</code>)</li> <li>is this maybe to do with garbage collection somehow?</li> </ul>

10,045,943

2

6

null

2012-03-27 15:12:20.003 UTC

8

2012-04-06 15:57:36.79 UTC

2012-03-27 20:45:43.013 UTC

null

742,084

null

742,084

null

1

13

c#|.net|process|windows-services|impersonation

6,752

Well I'm just suggesting you a work around: Why you don't put your core functionalities in a windows service, and then use the wpf app as a frontend ? So that if the user kill it, it doesn't stop the service. Then the service can regularly check that the wpf front end is started, and if needed restart it. I think it'll be a more "trusted" design that the one you're trying to do, which could let the antivirus think you're a bad software and block you. And to protect the windows service there is another question here: <a href="https://stackoverflow.com/questions/4266776/protecting-a-windows-service-from-untrusted-users">Protecting a Windows Service from untrusted users</a>

9,803,947

Create object from string

Is it possible to create a new object using a string? For example, how can I convert the string "product" to <code>var p = new Product</code>? Thanks in advance. EDIT What I want to do is to have a menu with <code><a href="#home"></a><a href="#products">products</a></code> and create the corresponding object from the href each time.

9,804,142

3

4

null

2012-03-21 11:42:27.97 UTC

8

2015-09-25 03:02:26.157 UTC

null

2,227,834

null

69,654

null

1

24

javascript

66,102

If you know the context, yes. Let's say you're in a browser environment and <code>Person</code> is a global constructor. Because any global variable is a property of the global object, it means you can access to <code>Person</code> through the global object <code>window</code>: <pre><code>var p = new Person() </code></pre> Is equivalent to: <pre><code>var p = new window.Person() </code></pre> So you can use the square bracket notation: <pre><code>var p = new window["Person"](); </code></pre> Of course this is valid for every kind of object. If you don't want pollute the global scope, you can have: <pre><code>var mynamespace = {}; mynamespace.Person = function Person() {..} var p = new mynamespace["Person"](); </code></pre>

9,703,810

How to disable migration in Entity Framework 4.3.1?

Is there any way to disable migration in Entity Framework 4.3.1? I removed the migrations folder from the project and the generated tables in my database, but it doesn't work! How can you remove the migration?

9,709,407

3

5

null

2012-03-14 14:23:24.393 UTC

7

2018-04-16 11:31:41.49 UTC

2013-01-07 02:05:03.113 UTC

null

90,674

null

645,167

null

1

39

code-first|entity-framework-migrations|entity-framework-4.3

59,425

If you don't want to use migrations but in the same time you want EF to create database for you, you just need to set correct database initializer: <pre><code>Database.SetInitializer<YourContextType>(new CreateDatabaseIfNotExists<YourContentType>()); </code></pre>

9,945,620

Making a table row into a link in Rails

I am trying to make a row in a table link to the edit page. I know the links are being created, because I can print them out. I am close, but am missing something important. What do I change to make the link work properly? <pre><code><h1>Scouts</h1> <%= button_to "Add a new Scout", new_scout_path, :method => :get %> <div class="message-board"> <table> <tr> <th>Name</th> <th>Rank</th> <th>Advancement Date</th> <th>Age</th> </tr> <% @scouts.each do |scout| %> <tr <% link_to edit_scout_path(scout) %> > <td><%= scout.name %></td> <td><%= scout.rank %></td> <td><%= scout.advancement %></td> <td><%= scout.age %></td> </tr> <% end %> </table> </div> </code></pre>

9,945,761

4

1

null

2012-03-30 15:07:14.993 UTC

13

2020-11-02 05:40:15.763 UTC

null

968,801

null

1

40

ruby-on-rails

24,997

As Robin said, that's invalid HTML. You probably shouldn't do that. I personally would put an <code>onclick</code> event on the <code>tr</code> using jQuery. The <code>tr</code> element would look like this: <pre><code><tr data-link="<%= edit_scout_path(scout) %>"> ... </tr> </code></pre> And then the associated JavaScript (placed in a file such as <code>app/assets/javascripts/scouts.js</code>) would be something like this: <pre><code>$("tr[data-link]").click(function() { window.location = $(this).data("link") }) </code></pre> This would make all <code>tr</code> elements that have a <code>data-link</code> attribute act as if they were URLs in the most unobtrusive way I can think possible.

10,002,439

Make index.html default, but allow index.php to be visited if typed in

I have the following line in my .htaccess file: <pre><code>DirectoryIndex index.html index.php </code></pre> Everytime I go to index.php it takes me to index.html. Is it possible to allow for both, but leave index.html the default for users visiting www.domain.com?

10,082,736

6

null

2012-04-03 22:35:13.61 UTC

15

2019-03-13 23:17:13.677 UTC

null

718,341

null

1

60

html|.htaccess

172,243

By default, the DirectoryIndex is set to: <pre><code>DirectoryIndex index.html index.htm default.htm index.php index.php3 index.phtml index.php5 index.shtml mwindex.phtml </code></pre> Apache will look for each of the above files, in order, and serve the first one it finds when a visitor requests just a directory. If the webserver finds no files in the current directory that match names in the DirectoryIndex directive, then a directory listing will be displayed to the browser, showing all files in the current directory. The order should be <code>DirectoryIndex index.html index.php</code> // default is index.html Reference: <a href="http://support.modwest.com/content/1/147/en/how-can-i-show-a-default-page-other-than-indexhtml.html" rel="noreferrer">Here</a>.

9,711,529

Save Subset of MongoDB Collection to Another Collection

I have a set like so <pre><code>{date: 20120101} {date: 20120103} {date: 20120104} {date: 20120005} {date: 20120105} </code></pre> How do I save a subset of those documents with the date '20120105' to another collection? i.e <code>db.subset.save(db.full_set.find({date: "20120105"}));</code>

9,712,776

7

0

null

2012-03-14 22:52:40.58 UTC

22

2022-06-14 12:25:36.867 UTC

null

719,919

null

1

68

mongodb

68,699

Here's the shell version: <pre><code>db.full_set.find({date:"20120105"}).forEach(function(doc){ db.subset.insert(doc); }); </code></pre> Note: As of MongoDB 2.6, the aggregation framework makes it possible to do this faster; see <a href="https://stackoverflow.com/a/25247084/1448678">melan's answer</a> for details.

7,997,440

How to create a sidebar similar to the facebook app for iOS?

<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/7989020/whats-the-best-way-to-develop-a-sideswipe-menu-like-the-one-in-facebooks-new-i">What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?</a> </blockquote> How can i create a sidebar similar to the facebook app for iOS (iPhone/iPad)? That sidebar that appears when you slide your finger horizontally. There is a component for this or is it just a UIView?

7,997,964

3

0

null

2011-11-03 15:24:06.23 UTC

16

2012-11-27 01:59:44.757 UTC

2017-05-23 12:14:06.96 UTC

null

-1

null

1,028,009

null

1

10

iphone|objective-c|ios|ipad

28,004

You're in luck! Somebody just created a complete sample app showing how to create that, and includes a video of the effect. Here it is: <a href="https://github.com/BenHall/ios_facebook_style_navigation">https://github.com/BenHall/ios_facebook_style_navigation</a>

11,788,242

What is the default color of a ListView divider line?

Currently I am using this code to see the divider lines: <pre><code>medalsList.setDivider(new ColorDrawable(0x99F10529)); medalsList.setDividerHeight(1); </code></pre> What is the default RGB color (as shown in the code above) used on a ListView that hasn't had its divider lines changed?

11,788,321

2

0

null

2012-08-03 01:58:05.067 UTC

10

2015-11-08 18:02:24.853 UTC

2015-04-18 01:51:27.073 UTC

null

1,427,098

null

546,509

null

1

31

android|android-listview

19,746

The default divider is determined by the <code>listDivider</code> item in the current theme. For the stock themes, the default divider is one of: <ul> <li>android:drawable/divider_horizontal_dark (Theme)</li> <li>android:drawable/divider_horizontal_bright (Theme.Light)</li> <li>android:drawable/divider_horizontal_holo_dark (Theme.Holo)</li> <li>android:drawable/divider_horizontal_holo_light (Theme.Holo.Light)</li> </ul> Those drawables can be found in the platforms data folder of your sdk installation.

11,519,777

How do I secure Socket.IO?

I've been working with Socket.IO for a few days and it's been both extremely exciting and even more frustrating. The lack of current documentation/tutorials has made learning it very difficult. I finally managed to create a basic chat system, but there is one glaring question. How do I secure it? What's stopping a malicious user from copying (or editing) my code and connecting to my server? I can grab the username from my PHP script and submit it to Socket.IO so I can recognize them as that user (and the PHP has security of course), but what's stopping someone from just submitting an unregistered username? How can I make sure that the events submitted are authentic and haven't been tampered with? My basic socket.io chat for references. Server: <pre><code>var io = require('socket.io').listen(8080); var connectCounter = 0; io.sockets.on('connection', function (socket) { connectCounter++; console.log('People online: ', connectCounter); socket.on('set username', function(username) { socket.set('username', username, function() { console.log('Connect', username); }); }); socket.on('emit_msg', function (msg) { // Get the variable 'username' socket.get('username', function (err, username) { console.log('Chat message by', username); io.sockets.volatile.emit( 'broadcast_msg' , username + ': ' + msg ); }); }); socket.on('disconnect', function() { connectCounter--; }); }); </code></pre> Client: <pre><code> <?php session_start() ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>untitled</title> </head> <body> <input id='message' type='text'> <div id="content"></div> <script src="http://localhost:8080/socket.io/socket.io.js"></script> <script src="http://code.jquery.com/jquery-latest.js"></script> <script> var socket = io.connect('http://localhost:8080'); $.ajax({ type: 'GET', url: 'https://mysite.com/execs/login.php?login_check=true', dataType: 'json', success: function(data) { var username = data.username; socket.emit('set username', username, function (data){ }); } }); socket.on('broadcast_msg', function (data) { console.log('Get broadcasted msg:', data); var msg = '<li>' + data + '</li>'; $('#content').append(msg); }); $('#message').keydown(function(e) { if(e.keyCode == 13) { e.stopPropagation(); var txt = $(this).val(); $(this).val(''); socket.emit('emit_msg', txt, function (data){ console.log('Emit Broadcast msg', data); }); } }); </script> </body> </html> </code></pre> It all works dandy, except for having absolutely no security.

11,600,116

2

3

null

2012-07-17 09:35:43.583 UTC

2

2014-02-05 22:37:21.303 UTC

null

278,976

null

938,745

null

1

32

javascript|security|node.js|socket.io

41,797

If you can install a key-value store like <a href="http://redis.io/" rel="nofollow noreferrer">Redis</a> on your node server, you can access it remotely from your php server using a Redis client like <a href="https://github.com/nrk/predis/" rel="nofollow noreferrer">Predis</a>. All you have to do is updating the remote session store on node server when a new login/logout happens in your php server. Check this post for details: <a href="https://stackoverflow.com/questions/6502031/authenticate-user-for-socket-io-nodejs">Authenticate user for socket.io/nodejs</a>

11,873,741

sampling random floats on a range in numpy

How can I sample random floats on an interval [a, b] in numpy? Not just integers, but any real numbers. For example, <code>random_float(5, 10)</code> would return random numbers between <code>[5, 10]</code>. thanks.

11,873,796

3

0

null

2012-08-08 21:52:06.5 UTC

6

2022-03-16 17:55:35.6 UTC

null

user248237

null

1

48

python|numpy|scipy

69,742

The <a href="https://numpy.org/doc/stable/reference/random/generated/numpy.random.uniform.html" rel="noreferrer">uniform distribution</a> would probably do what you are asking. <pre><code>np.random.uniform(5,10) # A single value np.random.uniform(5,10,[2,3]) # A 2x3 array </code></pre>

20,251,762

Sorting an int array from highest to lowest

So I just learned about the <code>Arrays.sort(arrayName);</code> and applied it in a project of mine but I found it sorts from lowest to highest. Is there anyway to have it do the opposite? (I don't think I need to post the code in question but if it is needed I'll post it).

20,251,835

4

5

null

2013-11-27 19:49:42.353 UTC

2

2016-08-02 16:32:46.227 UTC

2013-11-27 19:57:26.393 UTC

null

1,065,197

null

2,926,017

null

1

4

java|arrays|sorting

48,990

If you use an <code>Integer[]</code> instead of <code>int[]</code>, then you can pass a <code>Comparator</code> as 2nd argument to the sort method. To impose reverse ordering, you can make use of <a href="http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#reverseOrder%28%29"><code>Collections.reverseOrder()</code></a> method: <pre><code>Arrays.sort(arr, Collections.reverseOrder()); </code></pre>

3,292,643

Python - convert list of tuples to string

Which is the most pythonic way to convert a list of tuples to string? I have: <pre><code>[(1,2), (3,4)] </code></pre> and I want: <pre><code>"(1,2), (3,4)" </code></pre> My solution to this has been: <pre><code>l=[(1,2),(3,4)] s="" for t in l: s += "(%s,%s)," % t s = s[:-1] </code></pre> Is there a more pythonic way to do this?

3,292,703

7

8

null

2010-07-20 17:28:05.88 UTC

7

2018-06-06 18:29:08.157 UTC

2010-07-20 17:31:48.85 UTC

null

12,855

null

170,912

null

1

27

python|list|string-formatting|tuples

61,949

you might want to use something such simple as: <pre><code>>>> l = [(1,2), (3,4)] >>> str(l).strip('[]') '(1, 2), (3, 4)' </code></pre> .. which is handy, but not guaranteed to work correctly

3,590,677

How to do union, intersect, difference and reverse data in java

I want to implement the union, intersect, difference and reverse operations in Java. First I have 2 instances of <code>ArrayList<Integer></code> <pre><code>a = [0,2,4,5,6,8,10] b = [5,6,7,8,9,10] </code></pre> a union b should return <code>c = [0,2,4,5,6,7,8,9,10]</code> a intersect b should return <code>c = [5,8,10]</code> a difference b should return <code>c = [0,2,4]</code> reverse <code>a = [10,8,6,5,4,2,0]</code> Something like this. How to implement that method in Java? <hr> Update: I have to start with this template: <pre><code>package IntSet; import java.util.ArrayList; import java.util.Collection; public class IntSet { private ArrayList<Integer> intset; public IntSet(){ intset = new ArrayList<Integer>(); } public void insert(int x){ intset.add(x); } public void remove(int x){ //implement here intset.indexOf(x); } public boolean member(int x){ //implement here return true; } public IntSet intersect(IntSet a){ //implement here return a; } public IntSet union(IntSet a){ //implement here return a; } public IntSet difference(IntSet a){ //implement here IntSet b = new IntSet(); return b; } </code></pre>

3,590,725

7

2

null

2010-08-28 12:05:21.723 UTC

25

2020-11-27 23:24:05.067 UTC

2020-04-03 07:19:51.53 UTC

null

4,742,570

null

286,090

null

1

54

java

98,279

<pre><code>//Union List<Integer> c = new ArrayList<Integer>(a.size() + b.size()); addNoDups(c,a); addNoDups(c,b); private void addNoDups(List<Integer> toAddTo,List<Integer> iterateOver) { for(Integer num:iterateOver){ if(toAddTo.indexOf(num) == -1) { toAddTo.add(num); } } } //intersection List<Integer> c = new ArrayList<Integer> (a.size() > b.size() ?a.size():b.size()); c.addAll(a); c.retainAll(b); //difference a-b List<Integer> c = new ArrayList<Integer> (a.size()); c.addAll(a); c.removeAll(b); </code></pre>

3,814,234

How can I subscribe multiple buttons to the same event handler and act according to what button was clicked?

I have 6 buttons that I want to be attached to the same handler. How can I do this?

3,814,254

9

3

null

2010-09-28 15:13:54.483 UTC

7

2021-02-07 03:51:40.457 UTC

null

delete

null

1

29

c#|event-handling

65,406

When you subscribe to the event on a button, it's just a standard event handler: <pre><code>button1.Click += myEventHandler; </code></pre> You can use the same code to add handlers for every button: <pre><code>button1.Click += myEventHandler; button2.Click += myEventHandler; button3.Click += myEventHandler; button4.Click += myEventHandler; button5.Click += myEventHandler; button6.Click += myEventHandler; </code></pre> This will cause your handler in <code>myEventHandler</code> to be run when any of the buttons are clicked.

3,668,953

Raise event thread safely - best practice

In order to raise an event we use a method OnEventName like this: <pre><code>protected virtual void OnSomethingHappened(EventArgs e) { EventHandler handler = SomethingHappened; if (handler != null) { handler(this, e); } } </code></pre> But what is the difference with this one ? <pre><code>protected virtual void OnSomethingHappened(EventArgs e) { if (SomethingHappened!= null) { SomethingHappened(this, e); } } </code></pre> Apparently the first is thread-safe, but why and how ? It's not necessary to start a new thread ?

3,669,020

10

0

null

2010-09-08 14:48:53.847 UTC

18

2021-09-01 07:08:17.34 UTC

2010-09-09 08:23:16.557 UTC

null

424,072

null

424,072

null

1

48

c#|event-handling

38,783

There is a tiny chance that <code>SomethingHappened</code> becomes <code>null</code> after the null check but before the invocation. However, <code>MulticastDelagate</code>s are immutable, so if you first assign a variable, null check against the variable and invoke through it, you are safe from that scenario (self plug: I wrote a <a href="http://fmork.net/software/writing/2010/Extension-method-for-safe-event-invocations.htm" rel="noreferrer">blog post about this</a> a while ago). There is a back side of the coin though; if you use the temp variable approach, your code is protected against <code>NullReferenceException</code>s, but it could be that the event will invoke event listeners after they have been detached from the event. That is just something to deal with in the most graceful way possible. In order to get around this I have an extension method that I sometimes use: <pre><code>public static class EventHandlerExtensions { public static void SafeInvoke<T>(this EventHandler<T> evt, object sender, T e) where T : EventArgs { if (evt != null) { evt(sender, e); } } } </code></pre> Using that method, you can invoke the events like this: <pre><code>protected void OnSomeEvent(EventArgs e) { SomeEvent.SafeInvoke(this, e); } </code></pre>

4,408,858

Quartz retry when failure

Let's say I have a trigger configured this way: <pre><code><bean id="updateInsBBTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean"> <property name="jobDetail" ref="updateInsBBJobDetail"/>  <property name="cronExpression" value="0 0 5 * * ?"/> </bean> </code></pre> The trigger have to connect with another application and if there is any problem (like a connection failure) it should to retry the task up to five times every 10 minutes or until success. There is any way to configure the trigger to work like this?

4,409,263

3

0

null

2010-12-10 12:35:02.843 UTC

18

2020-04-02 07:34:36.163 UTC

2013-09-17 13:31:29.79 UTC

null

1,250,033

null

79,230

null

1

27

java|quartz-scheduler

43,498

Source: <a href="http://fahdshariff.blogspot.com/2010/12/automatically-retry-failed-jobs-in.html" rel="noreferrer">Automatically Retry Failed Jobs in Quartz</a> If you want to have a job which keeps trying over and over again until it succeeds, all you have to do is throw a JobExecutionException with a flag to tell the scheduler to fire it again when it fails. The following code shows how: <pre><code>class MyJob implements Job { public MyJob() { } public void execute(JobExecutionContext context) throws JobExecutionException { try{ //connect to other application etc } catch(Exception e){ Thread.sleep(600000); //sleep for 10 mins JobExecutionException e2 = new JobExecutionException(e); //fire it again e2.setRefireImmediately(true); throw e2; } } } </code></pre> It gets a bit more complicated if you want to retry a certain number of times. You have to use a StatefulJob and hold a retryCounter in its JobDataMap, which you increment if the job fails. If the counter exceeds the maximum number of retries, then you can disable the job if you wish. <pre><code>class MyJob implements StatefulJob { public MyJob() { } public void execute(JobExecutionContext context) throws JobExecutionException { JobDataMap dataMap = context.getJobDetail().getJobDataMap(); int count = dataMap.getIntValue("count"); // allow 5 retries if(count >= 5){ JobExecutionException e = new JobExecutionException("Retries exceeded"); //make sure it doesn't run again e.setUnscheduleAllTriggers(true); throw e; } try{ //connect to other application etc //reset counter back to 0 dataMap.putAsString("count", 0); } catch(Exception e){ count++; dataMap.putAsString("count", count); JobExecutionException e2 = new JobExecutionException(e); Thread.sleep(600000); //sleep for 10 mins //fire it again e2.setRefireImmediately(true); throw e2; } } } </code></pre>

4,269,896

Creating an instance of a nested class in XAML

in a XAML file (a WPF UserControl), is there a way to reference an inner class "B" defined in another class "A" ? <pre><code>public class A { public class B { } } </code></pre> Something like : <pre><code><local:A.B ... /> </code></pre> This syntax does not work because "B" is interpreted as a property named "B" in class "A". I've tried more exotic syntaxes like "::" or "+" but none seems to work. I'm currently using Silverlight 4 with VS2010. Thanks in advance for your help.

4,270,348

3

6

null

2010-11-24 17:49:09.327 UTC

10

2022-04-02 22:27:10.5 UTC

2010-11-25 21:23:04.857 UTC

null

145,757

null

145,757

null

1

39

wpf|xaml|inner-classes|nested-class

13,889

I was searching and searching, because if this is possible, I would like to know. Unfortunately, I found this on <a href="https://msdn.microsoft.com/en-us/library/ms753379(v=vs.100).aspx" rel="noreferrer">msdn</a>: <blockquote> Your custom class must not be a nested class. Nested classes and the "dot" in their general CLR usage syntax interfere with other WPF and/or XAML features such as attached properties. </blockquote> So, it appears you can't reference a nested class with the dot operator. As for alternative ways of getting to that inner class through XAML, I haven't had any luck in my searches yet. :o( But this is a rather interesting issue, so I will continue searching. Maybe I'll find some luck! :o)

4,086,800

Move constructor on derived object

When you have a derived object with a move constructor, and the base object also has move semantics, what is the proper way to call the base object move constructor from the derived object move constructor? I tried the most obvious thing first: <pre><code> Derived(Derived&& rval) : Base(rval) { } </code></pre> However, this seems to end up calling the Base object's copy constructor. Then I tried explicitly using <code>std::move</code> here, like this: <pre><code> Derived(Derived&& rval) : Base(std::move(rval)) { } </code></pre> This worked, but I'm confused why it's necessary. I thought <code>std::move</code> merely returns an rvalue reference. But since in this example <code>rval</code> is already an rvalue reference, the call to <code>std::move</code> should be superfluous. But if I don't use <code>std::move</code> here, it just calls the copy constructor. So why is the call to <code>std::move</code> necessary?

4,086,826

3

0

null

2010-11-03 11:59:00.397 UTC

8

2020-05-14 10:37:04.513 UTC

2013-03-15 13:22:06.963 UTC

null

313,113

null

469,408

null

1

59

c++|c++11|move-semantics

22,031

<code>rval</code> is not a Rvalue. It is an Lvalue inside the body of the move constructor. That's why we have to explicitly invoke <code>std::move</code>. Refer <a href="http://www.artima.com/cppsource/rvalue.html" rel="noreferrer">this</a>. The important note is <blockquote> Note above that the argument x is treated as an lvalue internal to the move functions, even though it is declared as an rvalue reference parameter. That's why it is necessary to say move(x) instead of just x when passing down to the base class. This is a key safety feature of move semantics designed to prevent accidently moving twice from some named variable. All moves occur only from rvalues, or with an explicit cast to rvalue such as using std::move. If you have a name for the variable, it is an lvalue. </blockquote>

14,450,123

C - Pointer to a matrix

I am trying to pass a matrix to a function by reference. The function will replace every element <code>A[i][j]</code> of the matrix by <code>-A[i][j]</code>. I first create the matrix: <pre><code>float a[3][4] = { {1.0f, 0.0f, 0.0f, 0.0f}, {0.0f, 1.0f, 0.0f, 0.0f}, {1.0f, 1.0f, 0.0f, 0.0f}, }; </code></pre> Then, I obtain the pointer to this matrix: <pre><code>float*** pa = &a; </code></pre> Then, I introduce the following function: <pre><code>void process(float ***matrix, int nRows, int nCols){ short i; short j; for (i=0 ; i<nRows; i++){ for (j=0 ; j<nCols ; j++){ (*matrix)[i][j] *= -1; } } } </code></pre> which I call as follows: <pre><code>process(pa,3,4); </code></pre> My program fails to execute and returns: <pre><code>Segmentation fault: 11 </code></pre> Any ideas? Summary of the answers: Some notes based on the questions this question received: I. The aforementioned function can be used, provided that <code>a</code> is initialized a bit differently so as to be a <code>float**</code>. In particular: <pre><code>int numberOfRows = 3; int numberOfColumns = 4; float **a = (float **) malloc(sizeof (float *) * numberOfRows); for (i = 0; i < numberOfRows; ++i) { a[i] = (float *) malloc(sizeof (float) * numberOfColumns); } </code></pre> and then, it is passed to the function <code>process</code> as <code>process(&a, 3,4);</code>. II. Alternatively, one may use the function: <pre><code>void multi_by_minus(float *matrix, int nRows, int nCols) { short i,j; for (i = 0; i < nRows; i++) { for (j = 0; j < nCols; j++) { matrix[i * nCols + j] *= -1; } } } </code></pre> which treats the matrix as an one-dimensional array. In that case we simply invoke it as <code>multi_by_minus(&a, 3, 4);</code> III. Finally, we may use the method: <pre><code>void process2(int nRows, int nCols, float (*matrix)[nCols]) { short i, j; for (i = 0; i < nRows; i++) { for (j = 0; j < nCols; j++) { matrix[i][j] *= -1; } } } </code></pre> to which we provide a pointer to <code>a</code>, i.e., we invoke it like <code>process2(3,4,&a);</code>. In this way, we acquire access to the elements of the matrix in 2D.

14,450,180

4

2

null

2013-01-22 01:25:31.92 UTC

null

2017-01-18 03:59:38.09 UTC

2013-01-22 20:06:28.18 UTC

null

613,016

null

613,016

null

1

3

c|pointers|matrix

44,297

There is no need for the triple pointer since you are already supplying the memory. You would use that if you were to allocate the memory inside de function. You can't index a 2 dimension matrix without supplying at least the size of 1 dimension. The reason is that the compiler needs to generate code to access the correct offset taking into account both dimensions. In this particular case, I suggest passing a simple pointer and indexing as a 1D array, like this: <pre><code>void process(float *matrix, int nRows, int nCols){ short i; short j; for (i=0 ; i<nRows; i++){ for (j=0 ; j<nCols ; j++){ matrix[i * nCols + j] *= -1; } } } </code></pre> You can then call it like this: <pre><code>process((float*)a,3,4); </code></pre> This way you manually index your buffer.

14,705,899

android.permission.INTERNET?

I'm using three buttons in my app 1) Feedback button: It allows the user to send feedback via any mail application 2) A share button which uses a share intent 3) A "rate app" button which opens my app's page on the play store All the 3 buttons uses other applications to access the internet. Do I need to add the android.permission.INTERNET permission in my manifest file?

14,706,014

2

null

2013-02-05 10:59:12.09 UTC

2

2015-11-17 05:35:16.223 UTC

null

1,951,690

null

1

7

android

39,725

The answer in this case is that no, the permissions are not required in this instance, as Dipendra has pointed out in his answer, as the application is sending it's requests as Intents via external applications and aren't direct requests to the network from within his application. A little background: The easiest way you can know whether you need the permission is to use your application on a test device. Does it work as you intended it? Do you get any errors without the <code>INTERNET</code> permission? If you do, then its clear that you need it! If not (and in the case of this question's scenario), you do not need the <code>INTERNET</code> permission. The permissions are there as a security feature. The permission in question is: <blockquote> public static final String INTERNET Allows applications to open network sockets. Constant Value: "android.permission.INTERNET" </blockquote> If your application needs network sockets, then your application needs permission to use them. Simple as that. Add the below line to your manifest if you require the permission: <pre><code><uses-permission android:name="android.permission.INTERNET"></uses-permission> </code></pre> The permissions are there to protect the user, so it is about being upfront and clear of what your applications intentions are.

4,434,797

Read a config file in BASH without using "source"

I'm attempting to read a config file that is formatted as follows: <pre><code>USER = username TARGET = arrows </code></pre> I realize that if I got rid of the spaces, I could simply source the config file, but for security reasons I'm trying to avoid that. I know there is a way to read the config file line by line. I think the process is something like: <ol> <li>Read lines into an array</li> <li>Filter out all of the lines that start with #</li> <li>search for the variable names in the array</li> </ol> After that I'm lost. Any and all help would be greatly appreciated. I've tried something like this with no success: <pre><code>backup2.config>cat ~/1 grep '^[^#].*' | while read one two;do echo $two done </code></pre> I pulled that from a forum post I found, just not sure how to modify it to fit my needs since I'm so new to shell scripting. <a href="http://www.linuxquestions.org/questions/programming-9/bash-shell-program-read-a-configuration-file-276852/" rel="noreferrer">http://www.linuxquestions.org/questions/programming-9/bash-shell-program-read-a-configuration-file-276852/</a> <hr> Would it be possible to automatically assign a variable by looping through both arrays? <pre><code>for (( i = 0 ; i < ${#VALUE[@]} ; i++ )) do "${NAME[i]}"=VALUE[i] done echo $USER </code></pre> Such that calling $USER would output "username"? The above code isn't working but I know the solution is something similar to that.

4,434,843

4

0

null

2010-12-14 00:24:14.87 UTC

9

2019-02-28 20:53:55.143 UTC

2010-12-14 01:56:02.377 UTC

null

541,289

null

541,289

null

1

15

bash|grep|eval|config

18,688

The following script iterates over each line in your input file (vars in my case) and does a pattern match against <code>=</code>. If the equal sign is found it will use <a href="http://www.network-theory.co.uk/docs/bashref/ShellParameterExpansion.html">Parameter Expansion</a> to parse out the variable name from the value. It then stores each part in it's own array, name and value respectively. <pre><code>#!/bin/bash i=0 while read line; do if [[ "$line" =~ ^[^#]*= ]]; then name[i]=${line%% =*} value[i]=${line#*= } ((i++)) fi done < vars echo "total array elements: ${#name[@]}" echo "name[0]: ${name[0]}" echo "value[0]: ${value[0]}" echo "name[1]: ${name[1]}" echo "value[1]: ${value[1]}" echo "name array: ${name[@]}" echo "value array: ${value[@]}" </code></pre> <h3>Input</h3> <pre><code>$ cat vars sdf USER = username TARGET = arrows asdf as23 </code></pre> <h3>Output</h3> <pre><code>$ ./varscript total array elements: 2 name[0]: USER value[0]: username name[1]: TARGET value[1]: arrows name array: USER TARGET value array: username arrows </code></pre>

4,230,746

Does being a competent scala programmer require you to be a competent java programmer?

I am a big fan of Scala aesthetically, and of a lot of the conceptual work put into things like its typing system and libraries. However, as I have begun tinkering with Scala (and seen some of my coworkers tinker with it) i find myself having to dig for more and more Java knowledge (especially in the way of libraries). This presents me with a few problems: <ul> <li>Having never been a Java programmer, i'm not familiar or comfortable with the Java standard library, or additional popular libraries (like Apache Commons).</li> <li>My google-fu in the Java-sphere is weak. It's hard to know what to search for – a problem exacerbated by the ponderously large number of irrelevant or rudimentary java tutorials for programming newbies.</li> </ul> At this point though, i'm not sure whether i should bite the bullet and try and find the quickest and most comprehensive tour through Java to catch myself up on 20 years of Java developments, or whether its reasonable to continue trying to incrementally patch my knowledge as i wander around scala. Any wisdom that scala heads amongst us could offer would be greatly appreciated. P.S. I have no doubt in my ability to familiarize myself with Scala syntax, and i'm perfectly comfortable and happy with functional programming and the paradigms in the scala community. But a programmer's competence is not just based on one's ability to teach oneself, but also one's ability to learn from, and adopt tools and skills from other people.

4,230,824

4

null

2010-11-20 01:26:55.643 UTC

8

2015-05-06 22:05:35.517 UTC

2010-11-20 01:34:30.757 UTC

null

333,795

null

333,795

null

1

40

java|scala|libraries

2,466

You should take a <code>lazy</code> approach to learning Java. Learn it when you need it. In my opinion, much of the old Java knowledge is out of date, much of the new tutorials are redundant. You certainly don't want to bother yourself with Java's antiquated <code>Collections</code>, for example. Many Java-based frameworks can be safely ignored. And the heavyweight JavaEE stack can be safely bypassed until you were forced to use a part of it. Many common patterns in Java are much simpler in Scala, with the former being burdened with much boilerplate code. Core logic should always be implemented in Scala. I believe you can do most of your work directly in Scala and only need to dip down into Java when building things like Swing or integrating with Spring, etc. In regard to choosing and using Java libraries, my personal guidelines are: <ol> <li>If Spring can do it, use Spring</li> <li>If Spring is too heavyweight, use what Spring uses.</li> <li>If Spring can't do it, check github projects</li> <li>If there's nothing on github, check Apache projects</li> <li>If there's nothing from Apache, check sourceforge(t).</li> <li>Finally, Google randomly or just build it yourself.</li> </ol> That's a bit tounge-in-cheek, but is the impression I get about the maturity and stability of third party libraries after having done Java for the last 12 years.

4,381,102

Differences between ARM architectures from a C programmer's perspective?

I'm fairly new to programming for ARM. I've noticed there are several architectures like ARMv4, ARMv5, ARMv6, etc. What is the difference between these? Do they have different instruction sets or behaviors? Most importantly, if I compile some C code for ARMv6, will it run on ARMv5? What about ARMv5 code running on ARMv6? Or would I only have to worry about the difference if I were writing kernel assembly code?

4,391,042

5

0

null

2010-12-07 20:11:32.177 UTC

21

2014-03-16 07:12:02.957 UTC

null

1,891

null

1

34

c|architecture|arm|instruction-set

13,753

The ARM world is a bit messy. For the C programmers, things are simple: all ARM architectures offer a regular, 32-bit with flat addressing programming model. As long as you stay with C source code, the only difference you may see is about endianness and performance. Most ARM processors (even old models) can be both big-endian and little-endian; the choice is then made by the logic board and the operating system. Good C code is endian neutral: it compiles and works correctly, regardless of the platform endianness (endian neutrality is good for reliability and maintainability, but also for performance: non-neutral code is code which accesses the same data through pointers of distinct sizes, and this wreaks havoc with the strict aliasing rules that the compiler uses to optimize code). The situation is quite different if you consider binary compatibility (i.e. reusing code which has been compiled once): <hr> <ul> <li>There are several instruction sets: <ol> <li>the original ARM instruction set with a 26-bit program counter (very old, very unlikely to be encountered nowadays)</li> <li>the ARM instruction set with a 32-bit program counter (often called "ARM code")</li> <li>the Thumb instruction set (16-bit simplified opcodes)</li> <li>the Thumb-2 instruction set (Thumb with extensions)</li> </ol></li> </ul> A given processor may implement several instruction sets. The newest processor which knows only ARM code is the StrongARM, an ARMv4 representative which is already quite old (15 years). The ARM7TDMI (ARMv4T architecture) knows both ARM and Thumb, as do almost all subsequent ARM systems except the Cortex-M. ARM and Thumb code can be mixed together within the same application, as long as the proper glue is inserted where conventions change; this is called thumb interworking and can be handled automatically by the C compiler. The Cortex-M0 knows only Thumb instructions. It knows a few extensions, because in "normal" ARM processors, the operating system must use ARM code (for handling interrupts); thus, the Cortex-M0 knows a few Thumb-for-OS things. This does not matter for application code. The other Cortex-M know only Thumb-2. Thumb-2 is mostly backward compatible with Thumb, at least at assembly level. <hr> <ul> <li>Some architectures add extra instructions.</li> </ul> Thus, if some code is compiled with a compiler switch telling that this is for an ARMv6, then the compiler may use one of the few instructions with the ARMv6 has but not the ARMv5. This is a common situation, encountered on almost all platforms: e.g., if you compile C code on a PC, with GCC, using the <code>-march=core2</code> flag, then the resulting binary may fail to run on an older Pentium processor. <hr> <ul> <li>There are several call conventions.</li> </ul> The call convention is the set of rules which specify how functions exchange parameters and return values. The processor knows only of its registers, and has no notion of a stack. The call convention tells in which registers parameters go, and how they are encoded (e.g. if there is a <code>char</code> parameter, it goes in the low 8 bits of a register, but is the caller supposed to clear/sign-extend the upper 24 bits, or not ?). It describes the stack structure and alignment. It normalizes alignment conditions and padding for structure fields. There are two main conventions for ARM, called ATPCS (old) and AAPCS (new). They are quite different on the subject of floating point values. For integer parameters, they are mostly identical (but AAPCS requires a stricter stack alignment). Of course, conventions vary depending on the instruction set, and the presence of Thumb interworking. In some cases, it is possible to have some binary code which conforms to both ATPCS and AAPCS, but that is not reliable and there is no warning on mismatch. So the bottom-line is: you cannot have true binary compatibility between systems which use distinct call conventions. <hr> <ul> <li>There are optional coprocessors.</li> </ul> The ARM architecture can be extended with optional elements, which add their own instructions to the core instruction set. The FPU is such an optional coprocessor (and it is very rarely encountered in practice). Another coprocessor is NEON, a SIMD instruction set found on some of the newer ARM processors. Code which uses a coprocessor will not run on a processor which does not feature that coprocessor, unless the operating system traps the corresponding opcodes and emulates the coprocessor in software (this is more or less what happens with floating-point arguments when using the ATPCS call convention, and it is slow). <hr> To sum up, if you have C code, then recompile it. Do not try to reuse code compiled for another architecture or system.

4,715,415

Base64: What is the worst possible increase in space usage?

If a server received a base64 string and wanted to check it's length before converting,, say it wanted to always permit the final byte array to be 16KB. How big could a 16KB byte array possibly become when converted to a Base64 string (assuming one byte per character)?

4,715,480

5

0

null

2011-01-17 16:27:46.493 UTC

31

2019-09-02 11:28:08.207 UTC

null

463,304

null

1

198

base64|expansion

106,845

Base64 encodes each set of three bytes into four bytes. In addition the output is padded to always be a multiple of four. This means that the size of the base-64 representation of a string of size n is: <pre><code>ceil(n / 3) * 4 </code></pre> So, for a 16kB array, the base-64 representation will be ceil(16*1024/3)*4 = 21848 bytes long ~= 21.8kB. A rough approximation would be that the size of the data is increased to 4/3 of the original.

4,150,435

php strtotime "last monday" if today is monday?

I want to use <code>strtotime("last Monday")</code>. The thing is, if today IS MONDAY, what does it return? It seems to be returning the date for the monday of last week. How can I make it return today's date in that case?

4,150,501

8

0

null

2010-11-11 00:31:31.307 UTC

10

2017-02-20 11:25:46.443 UTC

2010-11-11 00:43:37.437 UTC

null

31,671

null

25,645

null

1

43

php|datetime|strtotime

67,244

<blockquote> How can I make it return today's date in that case? </blockquote> pseudocode: <pre><code>if (today == monday) return today; else return strtotime(...); </code></pre> Btw, this trick also could work: <pre><code>strtotime('last monday', strtotime('tomorrow')); </code></pre>

4,171,140

How to iterate over values of an Enum having flags?

If I have a variable holding a flags enum, can I somehow iterate over the single-bit values in that specific variable? Or do I have to use Enum.GetValues to iterate over the entire enum and check which ones are set?

22,222,260

18

0

null

2010-11-13 05:34:54.03 UTC

27

2022-01-30 10:39:41.157 UTC

2020-09-06 09:29:47.24 UTC

null

578,411

user502255

null

1

154

c#|enums|enum-flags

81,997

Coming back at this a few years later, with a bit more experience, my ultimate answer for single-bit values only, moving from lowest bit to highest bit, is a slight variant of Jeff Mercado's inner routine: <pre><code>public static IEnumerable<Enum> GetUniqueFlags(this Enum flags) { ulong flag = 1; foreach (var value in Enum.GetValues(flags.GetType()).Cast<Enum>()) { ulong bits = Convert.ToUInt64(value); while (flag < bits) { flag <<= 1; } if (flag == bits && flags.HasFlag(value)) { yield return value; } } } </code></pre> It seems to work, and despite my objections of some years ago, I use HasFlag here, since it's far more legible than using bitwise comparisons and the speed difference is insignificant for anything I'll be doing. (It's entirely possible they've improved the speed of HasFlags since then anyway, for all I know...I haven't tested.)

14,405,693

Using cluster in an Expressjs app

I'm doing a little OJT on my first node project and, while I can stand up a simple server, the app is going to get hammered so using cluster seems like a good idea. I've cobbled together some code snippets that I've found in various searches (including SO), but the server won't start. I'm sure my inexperience with node has me doing something stupid, but I don't see it. <pre><code>var express = require( 'express' ); var cluster = require( 'cluster' ); var path = require( 'path' ); var cCPUs = require( 'os' ).cpus().length; var port = 3000; var root = path.dirname( __dirname ); if( cluster.isMaster ) { for( var i = 0; i < cCPUs; i++ ) { cluster.fork(); } cluster.on( 'death', function( worker ) { console.log( 'Worker ' + worker.pid + ' died.' ); }); } else { // eyes.inspect( process.env ); console.log( 'Worker: %s', process.env.NODE_WORKER_ID ); var app = express(); var routes = require( './routes' )( app ); app .use( cluster.repl( root + 'cluster.repl' ) ) .use( cluster.stats({ connections: true, requests: true }) ) .use( cluster.reload( root ) ) .listen( port ); } </code></pre> RESULT: <pre><code>TypeError: Object #<Cluster> has no method 'repl' </code></pre> If I remove the <code>use</code> calls, the workers start up correctly, but <code>process.env.NODE_WORKER_ID</code> is <code>undefined</code>. Inspecting <code>process.env</code> shows me that it's definitely not defined. Maybe the snippet I used was from an old version, but I'm not sure how to identify the worker thread in any other way. If anyone can unscrambled whatever I've scrambled, I'd really appreciate it.

14,439,764

3

4

null

2013-01-18 18:56:05.58 UTC

11

2021-09-23 07:44:03.34 UTC

null

1,665

null

1

17

node.js|express

19,800

For anyone searching later, here's what I ended up with: <pre class="lang-js prettyprint-override"><code>const cluster = require('cluster'); const express = require('express'); const path = require('path'); const port = 3000; const root = path.dirname(__dirname); const cCPUs = require('os').cpus().length; if (cluster.isMaster) { // Create a worker for each CPU for (let i = 0; i < cCPUs; i++) { cluster.fork(); } cluster.on('online', function (worker) { console.log('Worker ' + worker.process.pid + ' is online.'); }); cluster.on('exit', function (worker, code, signal) { console.log('worker ' + worker.process.pid + ' died.'); }); } else { const app = express(); const routes = require('./routes')(app); app.use(express.bodyParser()).listen(port); } </code></pre> I'm still very early in the node learning curve, but the server starts and appears to have a working running on each core. Thanks to JohnnyH for getting me on the right track.

14,741,688

How to display messages from jQuery Validate plugin inside of Tooltipster tooltips?

I'd like to use the <a href="http://calebjacob.com/tooltipster/">Tooltipster plugin</a> to display form errors generated by the <a href="http://docs.jquery.com/Plugins/Validation">jQuery Validate plugin</a>. jQuery for Validate plugin: <pre><code>$(document).ready(function () { $('#myform').validate({ // initialize jQuery Validate // other options, rules: { field1: { required: true, email: true }, field2: { required: true, minlength: 5 } } }); }); </code></pre> jQuery for Tooltipster plugin: <pre><code>$(document).ready(function () { $('.tooltip').tooltipster({ /* options */ }); // initialize tooltipster }); </code></pre> HTML: <pre><code><form id="myform"> <input type="text" name="field1" /> <input type="text" name="field2" /> <input type="submit" /> </form> </code></pre> How would I integrate the usage of these two jQuery plugins so that validation errors appear inside the tooltips?

14,741,689

2

0

null

2013-02-07 00:46:22.213 UTC

17

2020-06-12 11:46:34.023 UTC

2016-09-29 17:18:38.413 UTC

null

594,235

null

594,235

null

1

20

jquery|jquery-validate|tooltip|tooltipster

58,332

Solutions for Tooltipster versions 2.1, 3.0, & 4.0 are included in this answer. NOTE that <code>.tooltipster()</code> is only attached to a <code>type="text"</code> <code>input</code> element in my examples below. If your <code>form</code> contains other kinds of data input elements such as <code>type="radio"</code>, <code>type="date"</code>, <code>textarea</code>, <code>select</code>, etc., then you must adjust your selector accordingly or create additional instances of <code>.tooltipster()</code> for these other elements. Otherwise, everything will fail with errors. <hr> Tooltipster v2.1 First, initialize the Tooltipster plugin (<a href="http://calebjacob.com/tooltipster/#options" rel="nofollow noreferrer">with any options</a>) on all specific <code>form</code> elements that will display errors: <pre class="lang-js prettyprint-override"><code>$(document).ready(function () { // initialize tooltipster on form input elements $('#myform input[type="text"]').tooltipster({ trigger: 'custom', // default is 'hover' which is no good here onlyOne: false, // allow multiple tips to be open at a time position: 'right' // display the tips to the right of the element }); }); </code></pre> Second, use <a href="http://calebjacob.com/tooltipster/#advanced" rel="nofollow noreferrer">Tooltipster's advanced options</a> along with the <a href="http://docs.jquery.com/Plugins/Validation/validate#toptions" rel="nofollow noreferrer"><code>success:</code> and <code>errorPlacement:</code> callback functions built into the Validate plugin</a> to automatically show and hide the tooltips as follows: <pre class="lang-js prettyprint-override"><code>$(document).ready(function () { // initialize validate plugin on the form $('#myform').validate({ // any other options & rules, errorPlacement: function (error, element) { $(element).tooltipster('update', $(error).text()); $(element).tooltipster('show'); }, success: function (label, element) { $(element).tooltipster('hide'); } }); }); </code></pre> Working Demo: <a href="http://jsfiddle.net/2DUX2/" rel="nofollow noreferrer">http://jsfiddle.net/2DUX2</a> EDIT: Updated code to take advantage of the new Tooltipster API features released in version 2.1 on 2/12/13 <hr> <hr> UPDATE for Tooltipster v3.0 Tooltipster 3.0 is out and as such doesn't work the same as illustrated above. The following code provides an updated example. This version has the added benefit of not calling Tooltipster on every keystroke when the message has not yet changed. (Don't forget that you still need to attach <code>.tooltipster()</code> to your relevant <code>input</code> elements as illustrated above.) <pre class="lang-js prettyprint-override"><code>$(document).ready(function () { // initialize validate plugin on the form $('#myform').validate({ // any other options & rules, errorPlacement: function (error, element) { var lastError = $(element).data('lastError'), newError = $(error).text(); $(element).data('lastError', newError); if(newError !== '' && newError !== lastError){ $(element).tooltipster('content', newError); $(element).tooltipster('show'); } }, success: function (label, element) { $(element).tooltipster('hide'); } }); }); </code></pre> DEMO using Tooltipster v3.0: <a href="http://jsfiddle.net/2DUX2/3/" rel="nofollow noreferrer">jsfiddle.net/2DUX2/3/</a> <hr> <hr> UPDATE for Tooltipster v4.0 Note that the <code>onlyOne</code> option has been removed from the 4.0 version of the Tooltipster plugin. I also replaced the <code>success</code> callback with <code>unhighlight</code>. On "optional" fields, the error message was never removed when the field was subsequently blanked out... this is because the <code>success</code> function does not fire under these circumstances. This issue is not isolated to Tooltipster version 4, however the following code solves it moving forward. <pre><code>// initialize Tooltipster on text input elements $('input[type="text"]').tooltipster({ //find more options on the tooltipster page trigger: 'custom', // default is 'hover' which is no good here position: 'top', animation: 'grow' }); // initialize jQuery Validate $("#myform").validate({ errorPlacement: function (error, element) { var ele = $(element), err = $(error), msg = err.text(); if (msg != null && msg !== '') { ele.tooltipster('content', msg); ele.tooltipster('open'); } }, unhighlight: function(element, errorClass, validClass) { $(element).removeClass(errorClass).addClass(validClass).tooltipster('close'); }, rules: { .... </code></pre> DEMO using Tooltipster v4.0: <a href="https://jsfiddle.net/h5grrrr9/" rel="nofollow noreferrer">https://jsfiddle.net/h5grrrr9/</a>

14,448,056

The app references non-public selector in id (Facebook SDK iOS)

I was having this warning when submitting my app with Application Loader. <pre><code>The app references non-public selector in MyApp : id </code></pre> This warning can potentially reject my app from Apple AppStore's validation. My app is using Facebook SDK iOS 3.1.1 (also tried with 3.1)

14,448,057

8

1

null

2013-01-21 22:02:33.543 UTC

9

2014-05-26 21:47:24.01 UTC

null

836,501

null

1

43

ios|facebook|facebook-ios-sdk|application-loader

18,382

This problem happens because of the Facebook SDK for iOS. Application Loader forbids the use of the variable "id" from any FBGraphUser related class (maybe others variables too, didn't test) - e.g. : <pre><code>id<FBGraphUser> friend id<FBGraphUserExtraFields>user </code></pre> Facebook is informed about this problem as of january 2013 : <a href="https://developers.facebook.com/bugs/143882255765923/" rel="noreferrer">Bug Report</a> The workaround for the moment is to use these: <pre><code>[user objectForKey:@"id"] [friend objectForKey:@"id"] </code></pre> instead of <code>user.id</code> and <code>friend.id</code> as shown in the different Facebook samples.

1,832,962

Can you execute another EXE file from within a C# console application?

Can you execute another EXE file from within a C# console application? <ul> <li>Can you pass arguments?</li> <li>Can you get the exit code back?</li> </ul>

1,833,006

1

0

null

2009-12-02 13:37:37.723 UTC

9

2013-08-26 19:51:56.003 UTC

2013-08-26 19:49:53.183 UTC

null

63,550

null

26,521

null

1

27

c#|console-application

34,063

Like this: <pre><code> var proc = new Process(); proc.StartInfo.FileName = "something.exe"; proc.StartInfo.Arguments = "-v -s -a"; proc.Start(); proc.WaitForExit(); var exitCode = proc.ExitCode; proc.Close(); </code></pre>

31,259,891

Put customized functions in Sklearn pipeline

In my classification scheme, there are several steps including: <ol> <li>SMOTE (Synthetic Minority Over-sampling Technique)</li> <li>Fisher criteria for feature selection</li> <li>Standardization (Z-score normalisation)</li> <li>SVC (Support Vector Classifier)</li> </ol> The main parameters to be tuned in the scheme above are percentile (2.) and hyperparameters for SVC (4.) and I want to go through grid search for tuning. The current solution builds a "partial" pipeline including step 3 and 4 in the scheme <code>clf = Pipeline([('normal',preprocessing.StandardScaler()),('svc',svm.SVC(class_weight='auto'))])</code> and breaks the scheme into two parts: <ol> <li>Tune the percentile of features to keep through the first grid search <pre class="lang-py prettyprint-override"><code>skf = StratifiedKFold(y) for train_ind, test_ind in skf: X_train, X_test, y_train, y_test = X[train_ind], X[test_ind], y[train_ind], y[test_ind] # SMOTE synthesizes the training data (we want to keep test data intact) X_train, y_train = SMOTE(X_train, y_train) for percentile in percentiles: # Fisher returns the indices of the selected features specified by the parameter 'percentile' selected_ind = Fisher(X_train, y_train, percentile) X_train_selected, X_test_selected = X_train[selected_ind,:], X_test[selected_ind, :] model = clf.fit(X_train_selected, y_train) y_predict = model.predict(X_test_selected) f1 = f1_score(y_predict, y_test) </code></pre> The f1 scores will be stored and then be averaged through all fold partitions for all percentiles, and the percentile with the best CV score is returned. The purpose of putting 'percentile for loop' as the inner loop is to allow fair competition as we have the same training data (including synthesized data) across all fold partitions for all percentiles. </li> <li>After determining the percentile, tune the hyperparameters by second grid search <pre class="lang-py prettyprint-override"><code>skf = StratifiedKFold(y) for train_ind, test_ind in skf: X_train, X_test, y_train, y_test = X[train_ind], X[test_ind], y[train_ind], y[test_ind] # SMOTE synthesizes the training data (we want to keep test data intact) X_train, y_train = SMOTE(X_train, y_train) for parameters in parameter_comb: # Select the features based on the tuned percentile selected_ind = Fisher(X_train, y_train, best_percentile) X_train_selected, X_test_selected = X_train[selected_ind,:], X_test[selected_ind, :] clf.set_params(svc__C=parameters['C'], svc__gamma=parameters['gamma']) model = clf.fit(X_train_selected, y_train) y_predict = model.predict(X_test_selected) f1 = f1_score(y_predict, y_test) </code></pre> </li> </ol> It is done in the very similar way, except we tune the hyperparamter for SVC rather than percentile of features to select. My questions are: <ol> <li>In the current solution, I only involve 3. and 4. in the <code>clf</code> and do 1. and 2. kinda "manually" in two nested loop as described above. Is there any way to include all four steps in a pipeline and do the whole process at once? </li> <li>If it is okay to keep the first nested loop, then is it possible (and how) to simplify the next nested loop using a single pipeline <pre class="lang-py prettyprint-override"><code>clf_all = Pipeline([('smote', SMOTE()), ('fisher', Fisher(percentile=best_percentile)) ('normal',preprocessing.StandardScaler()), ('svc',svm.SVC(class_weight='auto'))]) </code></pre> and simply use <code>GridSearchCV(clf_all, parameter_comb)</code> for tuning? Please note that both <code>SMOTE</code> and <code>Fisher</code> (ranking criteria) have to be done only for the training data in each fold partition. </li> </ol> It would be so much appreciated for any comment. <code>SMOTE</code> and <code>Fisher</code> are shown below: <pre class="lang-py prettyprint-override"><code>def Fscore(X, y, percentile=None): X_pos, X_neg = X[y==1], X[y==0] X_mean = X.mean(axis=0) X_pos_mean, X_neg_mean = X_pos.mean(axis=0), X_neg.mean(axis=0) deno = (1.0/(shape(X_pos)[0]-1))*X_pos.var(axis=0) +(1.0/(shape(X_neg[0]-1))*X_neg.var(axis=0) num = (X_pos_mean - X_mean)**2 + (X_neg_mean - X_mean)**2 F = num/deno sort_F = argsort(F)[::-1] n_feature = (float(percentile)/100)*shape(X)[1] ind_feature = sort_F[:ceil(n_feature)] return(ind_feature) </code></pre> <code>SMOTE</code> is from <a href="https://github.com/blacklab/nyan/blob/master/shared_modules/smote.py" rel="noreferrer">https://github.com/blacklab/nyan/blob/master/shared_modules/smote.py</a>, it returns the synthesized data. I modified it to return the original input data stacked with the synthesized data along with its labels and synthesized ones. <pre class="lang-py prettyprint-override"><code>def smote(X, y): n_pos = sum(y==1), sum(y==0) n_syn = (n_neg-n_pos)/float(n_pos) X_pos = X[y==1] X_syn = SMOTE(X_pos, int(round(n_syn))*100, 5) y_syn = np.ones(shape(X_syn)[0]) X, y = np.vstack([X, X_syn]), np.concatenate([y, y_syn]) return(X, y) </code></pre>

31,299,784

3

0

null

2015-07-07 04:44:07.187 UTC

8

2021-12-15 02:11:04.7 UTC

2021-06-18 09:19:11.447 UTC

null

1,364,007

null

3,882,995

null

1

18

machine-learning|scikit-learn|pipeline|cross-validation|feature-selection

26,711

I don't know where your <code>SMOTE()</code> and <code>Fisher()</code> functions are coming from, but the answer is yes you can definitely do this. In order to do so you will need to write a wrapper class around those functions though. The easiest way to this is inherit sklearn's <code>BaseEstimator</code> and <code>TransformerMixin</code> classes, see this for an example: <a href="http://scikit-learn.org/stable/auto_examples/hetero_feature_union.html" rel="noreferrer">http://scikit-learn.org/stable/auto_examples/hetero_feature_union.html</a> If this isn't making sense to you, post the details of at least one of your functions (the library it comes from or your code if you wrote it yourself) and we can go from there. EDIT: I apologize, I didn't look at your functions closely enough to realize that they transform your target in addition to your training data (i.e. both X and y). Pipeline does not support transformations to your target so you will have do them prior as you originally were. For your reference, here is what it would look like to write your custom class for your Fisher process which would work if the function itself did not need to affect your target variable. <pre><code>>>> from sklearn.base import BaseEstimator, TransformerMixin >>> from sklearn.preprocessing import StandardScaler >>> from sklearn.svm import SVC >>> from sklearn.pipeline import Pipeline >>> from sklearn.grid_search import GridSearchCV >>> from sklearn.datasets import load_iris >>> >>> class Fisher(BaseEstimator, TransformerMixin): ... def __init__(self,percentile=0.95): ... self.percentile = percentile ... def fit(self, X, y): ... from numpy import shape, argsort, ceil ... X_pos, X_neg = X[y==1], X[y==0] ... X_mean = X.mean(axis=0) ... X_pos_mean, X_neg_mean = X_pos.mean(axis=0), X_neg.mean(axis=0) ... deno = (1.0/(shape(X_pos)[0]-1))*X_pos.var(axis=0) + (1.0/(shape(X_neg)[0]-1))*X_neg.var(axis=0) ... num = (X_pos_mean - X_mean)**2 + (X_neg_mean - X_mean)**2 ... F = num/deno ... sort_F = argsort(F)[::-1] ... n_feature = (float(self.percentile)/100)*shape(X)[1] ... self.ind_feature = sort_F[:ceil(n_feature)] ... return self ... def transform(self, x): ... return x[self.ind_feature,:] ... >>> >>> data = load_iris() >>> >>> pipeline = Pipeline([ ... ('fisher', Fisher()), ... ('normal',StandardScaler()), ... ('svm',SVC(class_weight='auto')) ... ]) >>> >>> grid = { ... 'fisher__percentile':[0.75,0.50], ... 'svm__C':[1,2] ... } >>> >>> model = GridSearchCV(estimator = pipeline, param_grid=grid, cv=2) >>> model.fit(data.data,data.target) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/grid_search.py", line 596, in fit return self._fit(X, y, ParameterGrid(self.param_grid)) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/grid_search.py", line 378, in _fit for parameters in parameter_iterable File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/externals/joblib/parallel.py", line 653, in __call__ self.dispatch(function, args, kwargs) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/externals/joblib/parallel.py", line 400, in dispatch job = ImmediateApply(func, args, kwargs) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/externals/joblib/parallel.py", line 138, in __init__ self.results = func(*args, **kwargs) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/cross_validation.py", line 1239, in _fit_and_score estimator.fit(X_train, y_train, **fit_params) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/pipeline.py", line 130, in fit self.steps[-1][-1].fit(Xt, y, **fit_params) File "/Users/dmcgarry/anaconda/lib/python2.7/site-packages/sklearn/svm/base.py", line 149, in fit (X.shape[0], y.shape[0])) ValueError: X and y have incompatible shapes. X has 1 samples, but y has 75. </code></pre>

38,792,122

How to group and count rows by month and year using Pandas?

I have a dataset with personal data such as name, height, weight and date of birth. I would build a graph with the number of people born in a particular month and year. I'm using python pandas to accomplish this and my strategy was to try to group by year and month and add using count. But the closest I got is to get the count of people by year or by month but not by both. <pre><code>df['birthdate'].groupby(df.birthdate.dt.year).agg('count') </code></pre> Other questions in stackoverflow point to a Grouper called TimeGrouper but searching in pandas documentation found nothing. Any idea?

38,792,175

5

0

null

2016-08-05 14:49:47.5 UTC

15

2020-05-13 02:47:34.033 UTC

null

7,758,804

null

831,790

null

1

37

python|pandas

87,788

To group on multiple criteria, pass a list of the columns or criteria: <pre><code>df['birthdate'].groupby([df.birthdate.dt.year, df.birthdate.dt.month]).agg('count') </code></pre> Example: <pre><code>In [165]: df = pd.DataFrame({'birthdate':pd.date_range(start=dt.datetime(2015,12,20),end=dt.datetime(2016,3,1))}) df.groupby([df['birthdate'].dt.year, df['birthdate'].dt.month]).agg({'count'}) Out[165]: birthdate count birthdate birthdate 2015 12 12 2016 1 31 2 29 3 1 </code></pre> UPDATE As of version <a href="https://github.com/pandas-dev/pandas/issues/21075" rel="noreferrer"><code>0.23.0</code></a> the above code no longer works due to the restriction that multi-index level names must be unique, you now need to <code>rename</code> the levels in order for this to work: <pre><code>In[107]: df.groupby([df['birthdate'].dt.year.rename('year'), df['birthdate'].dt.month.rename('month')]).agg({'count'}) Out[107]: birthdate count year month 2015 12 12 2016 1 31 2 29 3 1 </code></pre>

38,910,198

What is a local variable in tensorflow?

Tensorflow has this API defined: <blockquote> <code>tf.local_variables()</code> Returns all variables created with <code>collection=[LOCAL_VARIABLES]</code>. Returns: A list of local Variable objects. </blockquote> What exactly is a local variable in TensorFlow? Can someone give me an example?

38,956,426

3

1

null

2016-08-12 04:54:06.107 UTC

16

2018-09-01 05:30:26.2 UTC

2020-06-20 09:12:55.06 UTC

null

-1

null

4,451,484

null

1

19

tensorflow

12,316

It's the same as regular variable, but it's in a different collection than default (<code>GraphKeys.VARIABLES</code>). That collection is used by saver to initialize the default list of variables to save, so having a <code>local</code> designation has an effect of not saving that variable by default. I'm seeing only one place that uses it in the codebase, which is the <code>limit_epochs</code> <pre><code> with ops.name_scope(name, "limit_epochs", [tensor]) as name: zero64 = constant_op.constant(0, dtype=dtypes.int64) epochs = variables.Variable( zero64, name="epochs", trainable=False, collections=[ops.GraphKeys.LOCAL_VARIABLES]) </code></pre>

49,633,157

How do I set headers to all responses in Koa.js?

In Express.js I used to have this kind of code: <pre><code>app.use((req, res, next) => { res.header('Access-Control-Allow-Origin', '*'); res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept'); res.header('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS'); next(); }); </code></pre> How do I do the same thing with Koa.js? I need to preset these several http headers for each server response.

49,633,526

1

0

null

2018-04-03 14:56:06.927 UTC

4

2018-04-03 15:13:03.167 UTC

null

2,992,008

null

1

28

javascript|node.js|koa

25,164

Finaly I found how to do it. <pre><code>app.use(async (ctx, next) => { ctx.set('Access-Control-Allow-Origin', '*'); ctx.set('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept'); ctx.set('Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS'); await next(); }); </code></pre>

29,735,527

Why the App is installed twice?

When I run the Android App Studio, the cell is the App is "installed" twice: There are two apps one called "SplashScreenActivity" and other "Doctor Quiz" (my app), the two are equal. If I uninstall one, the other also uninstalls. Why does this happen? How do I "install" just my app? (DoctorQuiz) AndroidManifest.xml <pre><code><?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.morais.daniela.doctorquiz" > <uses-permission android:name="android.permission.INTERNET"/> <provider android:authorities="com.facebook.app.FacebookContentProviderXXXX" android:name="com.facebook.FacebookContentProvider" android:exported="true" /> <application android:allowBackup="true" android:icon="@drawable/medicine_box_icon2" android:label="@string/app_name" android:theme="@style/AppTheme" > <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/> <activity android:name=".Activity.SplashScreenActivity" android:configChanges="orientation|keyboardHidden|screenSize" android:label="@string/title_activity_splash_screen" android:theme="@style/FullscreenTheme"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".Activity.QuestionsActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".Activity.ResultActivity" android:label="@string/title_activity_result" > <activity android:name="com.facebook.FacebookActivity" android:configChanges= "keyboard|keyboardHidden|screenLayout|screenSize|orientation" android:theme="@android:style/Theme.Translucent.NoTitleBar" android:label="@string/app_name" /> </activity> </application> </manifest> </code></pre> Screenshot <img src="https://i.stack.imgur.com/uX20p.png" alt="enter image description here">

29,735,556

2

0

null

2015-04-19 20:35:24.29 UTC

8

2021-10-05 20:03:28.98 UTC

null

4,587,985

null

1

24

android|android-studio

12,899

The app is not installed twice. You are not looking at apps. You are looking at launchable activities, ones with this <code><intent-filter></code>: <pre><code> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </code></pre> You have two activities with that <code><intent-filter></code>, and so you will have two activities in the home screen launcher. If you do not want both of those activities in the home screen launcher, remove that <code><intent-filter></code> from one of them.

49,897,639

How to allow any other key in Joi

I have a simple requirement. I tried to search on the internet as well as documentation but failed. So here is what I want to achieve: I have a schema: <pre><code>const schema = Joi.object().keys({ a: Joi.string().required(), b: Joi.string().required() }); </code></pre> Now, How do I configure it such that any other key in the object would be allowed? With this schema, it only allows two keys <code>a</code> and <code>b</code>. If I pass any other key, say, <code>c</code>, it throws an error saying that <code>c</code> is not allowed.

49,898,360

2

1

null

2018-04-18 10:40:10.633 UTC

2

2020-05-21 22:06:52.987 UTC

null

5,403,618

null

1

48

javascript|hapi.js|joi

33,990

You can add unknown keys using <a href="https://github.com/hapijs/joi/blob/v13.2.0/API.md#objectpatternregex-schema" rel="noreferrer">object.pattern(regex, schema)</a> this way IF you want to make sure these unknown keys are strings: <div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>const schema = Joi.object().keys({ a: Joi.string().required(), b: Joi.string().required() }).pattern(/./, Joi.string());</code></pre> </div> </div> For a general pass of all key types use <a href="https://github.com/hapijs/joi/blob/master/API.md#objectunknownallow" rel="noreferrer">object.unknown(true)</a>: <pre><code>const schema = Joi.object().keys({ a: Joi.string().required(), b: Joi.string().required() }).unknown(true); </code></pre>

36,275,459

Find the closest elements above and below a given number

<pre><code>myArr = array([4,1,88,44,3]) myNumber = 25 FindClosest(myArr, myNumber) ... 4, 44 </code></pre> Is there any way to find the closest 2 numbers in a list to a given number such that one of them is higher and the other lower? I can find the closest number by: <pre><code>min(myArr.tolist(), key=lambda x:abs(x-myNumber)) </code></pre>

36,275,584

4

0

null

2016-03-29 04:29:49.733 UTC

9

2022-06-17 17:57:31.93 UTC

2017-03-08 15:42:26.517 UTC

null

674,039

null

308,827

null

1

15

python|numpy

20,813

Sorting is not necessary, and makes this time complexity O(n logn) when it should be just O(n). I believe this is what you're looking for, taking advantage of numpy array indexing: <pre><code>>>> # the smallest element of myArr greater than myNumber >>> myArr[myArr > myNumber].min() 44 >>> # the largest element of myArr less than myNumber >>> myArr[myArr < myNumber].max() 4 </code></pre>

28,207,571

Camera access with Xamarin.Forms

Is anyone able to give a short, self-contained example on how to access the camera with Xamarin.Forms 1.3.x? Simply calling the native camera application and retrieving the resulting picture would be great. Displaying a live view on the Xamarin.Forms page would be awesome! I already tried to use Xamarin.Mobile and Xamarin.Forms.Labs, but I couldn't get any solution to work on both platforms (focussing on Android and iOS for now). Most code snippets found on the web (including stackoverflow) are incomplete, e.g. not showing the implementation of an IMediaPicker object or where to anchor the method for taking pictures.

28,299,259

4

0

null

2015-01-29 05:27:18.587 UTC

22

2017-07-06 07:10:27.363 UTC

null

3,419,103

null

1

35

c#|camera|xamarin.forms|xamarin.mobile|xamarin.forms.labs

60,279

I finally created a minimum solution for iOS and Android. <h2>The shared project</h2> First, let's look into the shared code. For an easy interaction between the shared <code>App</code> class and the platform-specific code we store a static <code>Instance</code> within the <code>public static App</code>: <pre class="lang-cs prettyprint-override"><code>public static App Instance; </code></pre> Furthermore, we will display an <code>Image</code>, which will be filled with content later. So we create a member: <pre><code>readonly Image image = new Image(); </code></pre> Within the <code>App</code> constructor we store the <code>Instance</code> and create the page content, which is a simple <code>button</code> and the aforementioned <code>image</code>: <pre><code>public App() { Instance = this; var button = new Button { Text = "Snap!", Command = new Command(o => ShouldTakePicture()), }; MainPage = new ContentPage { Content = new StackLayout { VerticalOptions = LayoutOptions.Center, Children = { button, image, }, }, }; } </code></pre> The button's click handler calls the event <code>ShouldTakePicture</code>. It is a public member and the platform-specific code parts will assign to it later on. <pre><code>public event Action ShouldTakePicture = () => {}; </code></pre> Finally, we offer a public method for displaying the captured image: <pre><code>public void ShowImage(string filepath) { image.Source = ImageSource.FromFile(filepath); } </code></pre> <h2>The Android project</h2> On Android we modify the <code>MainActivity</code>. First, we define a path for the captured image file: <pre><code>static readonly File file = new File(Environment.GetExternalStoragePublicDirectory(Environment.DirectoryPictures), "tmp.jpg"); </code></pre> At the end of <code>OnCreate</code> we can use the static <code>Instance</code> of the created <code>App</code> and assign an anonymous event handler, which will start a new <code>Intent</code> for capturing an image: <pre><code>App.Instance.ShouldTakePicture += () => { var intent = new Intent(MediaStore.ActionImageCapture); intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(file)); StartActivityForResult(intent, 0); }; </code></pre> Last but not least, our activity has to react on the resulting image. It will simply push its file path to the shared <code>ShowImage</code> method. <pre><code>protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) { base.OnActivityResult(requestCode, resultCode, data); App.Instance.ShowImage(file.Path); } </code></pre> That's about it! Just don't forget to set the "Camera" and the "WriteExternalStorage" permission within "AndroidManifest.xml"! <h2>The iOS project</h2> For the iOS implementation we create a custom renderer. Therefore, we add a new file "CustomContentPageRenderer" and add the corresponding assembly attribute right after the using statements: <pre><code>[assembly:ExportRenderer(typeof(ContentPage), typeof(CustomContentPageRenderer))] </code></pre> The <code>CustomContentPageRenderer</code> inherits from <code>PageRenderer</code>: <pre><code>public class CustomContentPageRenderer: PageRenderer { ... } </code></pre> We override the <code>ViewDidAppear</code> method and add the following parts. Create a new image picker controller referring to the camera: <pre><code>var imagePicker = new UIImagePickerController { SourceType = UIImagePickerControllerSourceType.Camera }; </code></pre> Present the image picker controller, as soon as the <code>ShouldTakePicture</code> event is raised: <pre><code>App.Instance.ShouldTakePicture += () => PresentViewController(imagePicker, true, null); </code></pre> After taking the picture, save it to the <code>MyDocuments</code> folder and call the shared <code>ShowImage</code> method: <pre><code>imagePicker.FinishedPickingMedia += (sender, e) => { var filepath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "tmp.png"); var image = (UIImage)e.Info.ObjectForKey(new NSString("UIImagePickerControllerOriginalImage")); InvokeOnMainThread(() => { image.AsPNG().Save(filepath, false); App.Instance.ShowImage(filepath); }); DismissViewController(true, null); }; </code></pre> And finally, we need to handle a cancellation of the image taking process: <pre><code>imagePicker.Canceled += (sender, e) => DismissViewController(true, null); </code></pre>

40,650,338

Valgrind on macOS Sierra

I following this guide: <a href="http://valgrind.org/downloads/repository.html">valgrind installation guide</a> After I have downloading the package, and I have run the sh script, but when I launch the <code>make install</code> command, it couldn't create the folder because it don't have the permission (even though I have used the <code>sudo</code> command). Furthermore I tried with brew but I have this error: <blockquote> valgrind: This formula either does not compile or function as expected on macOS versions newer than El Capitan due to an upstream incompatibility. Error: An unsatisfied requirement failed this build. </blockquote>

40,713,782

5

2

null

2016-11-17 08:52:02.61 UTC

8

2022-04-04 17:03:55.577 UTC

null

6,608,222

null

1

46

valgrind|macos-sierra

69,610

You can download Valgrind's latest version from their <a href="http://www.valgrind.org/downloads/current.html#current">website</a>. Then, you can just <code>./autogen.sh</code> to install Valgrind. I personally did not encounter anything needed to <code>make</code>. However, the sad news is, even the most recent version of Valgrind is not very usable on Mac OS Sierra. The reason is that Apple has not released the part of the source code that makes Valgrind crash, without which, the Valgrind maintainers can hardly do anything. You can read more about the discussion around the issue <a href="https://bugs.kde.org/show_bug.cgi?id=365327">here</a> . Because Mac OS kernel is under <a href="https://en.wikipedia.org/wiki/Apple_Public_Source_License">Apple Public Source License</a>, it has to be open-sourced someday. Thus, a Sierra-complitable version of Valgrind is only a matter of time. Currently, I use Valgrind under Linux. This is all I can suggest now.

20,970,672

How to specify character literal in groovy?

How do I specify a character literal in groovy since both 'a' and "a" result in string? I do not want to declare a character variable just for this purpose.

20,970,848

4

0

null

2014-01-07 11:38:54.337 UTC

1

2018-01-18 13:00:54.44 UTC

null

1,345,655

null

1

48

groovy

23,838

If this is for a variable, you can also define the type, so: <pre><code>import java.awt.image.* new BufferedImage( 1, 1, BufferedImage.TYPE_INT_RGB ).with { createGraphics().with { // Declare the type char aChar = 'a' // Both ways are equivalent and work assert fontMetrics.charWidth( aChar ) == fontMetrics.charWidth( 'a' as char ) dispose() } } </code></pre> (apologies for the long example, but I had brain freeze, and couldn't think of a different standard java function that takes a <code>char</code>) ;-) This also goes against the second line of the question, but I thought I'd add it for completeness

21,170,395

How to include a library module dependency in an Android Studio project?

I am migrating a project from Eclipse to AndroidStudio. I have a project used as a lib in this project. This lib is called PullToRefresh. I've tried many ways to import this project to AS, but anyting I try works. In my project I have this folder structure: <pre><code>Project Root +-- app | +-- builds | +-- libs | | +-- PullToRefresh (my lib project) | +-- src | | +-- main (java code and resources) </code></pre> In the build.gradle, I've tried to do this: <pre><code>dependencies { compile project(":libs:PullToRefresh") } </code></pre> But I'm getting this error message: <pre><code>Gradle 'my_project' project refresh failed: Project with path ':libs:PullToRefresh' could not be found in project ':app' </code></pre>

21,170,626

2

0

null

2014-01-16 18:53:51.017 UTC

10

2019-05-30 13:28:06.867 UTC

2015-10-10 02:03:28.137 UTC

null

1,771,682

null

1,771,682

null

1

18

android|android-studio|gradle|android-gradle-plugin|build.gradle

63,850

Android Studio works on project-modules concept,All your modules should be inside a root directory(Your Project Directory). One module can be depended on other module/modules. Your libraries are considered as different modules under same project and your main module(app in your case) depends on them. Change your project structure a little bit : <pre><code>Project Root +-- libs +-- PullToRefresh (my lib project) +-- app | +-- builds | +-- src | | +-- main (java code and resources) +-- ..... +--settings.gradle </code></pre> Include this line in your <code>settings.gradle</code> <pre><code>include ':libs:PullToRefresh' </code></pre> Your build.gradle looks fine. I suggest you to change your directory name from libs to library because use libs for your jar dependency not for module dependencies. and keep this in your main module's build.gradle file : <pre><code>dependencies { compile project(":libs:PullToRefresh") } </code></pre>

47,795,937

How docker handles multiple mount types?

This post is somewhat lenglthy but bear with me for a while... Suppose you have an app that sits in <code>/app</code> in your local (host) filesystem with the following structure <pre><code>app |-- index.php |-- foo | `-- file-h1 `-- bar `-- file-h2 </code></pre> Now suppose we have an image (tagged <code>myrepo/app</code>) that exploits the following data structure <pre><code>opt |-- app | `-- foo | `-- file-c1 </code></pre> If we run a container from that image by mounting host's <code>/app</code> to container's <code>/opt/app</code> as follows <pre><code>docker container run \ -v /app:/opt/app \ myrepo/app </code></pre> The resulting data structure of the container will be the following <pre><code>opt |-- app | |-- index.php | |-- foo | | `-- file-h1 | `-- bar | `-- file-h2 </code></pre> So far, so good... <h3>Running container with multiple mounts (both bind-mounts and volumes)</h3> Now, lets say that we want to use both a named volume called <code>data</code> to be mounted on <code>/opt/app/foo</code> and a bind-mount for mounting <code>/app</code> to <code>/opt/app</code> <pre><code>docker container run \ -v /app:/opt/app \ -v data:/opt/app/foo myrepo/app </code></pre> The resulting data structure inside the container will be: <pre><code>opt |-- app | |-- index.php | |-- foo | | `-- file-c1 | `-- bar | `-- file-h2 </code></pre> As it is stated in various posts (like <a href="https://github.com/moby/moby/issues/26051#issuecomment-242847347" rel="nofollow noreferrer">this</a> and <a href="https://github.com/moby/moby/issues/19120#issuecomment-169330570" rel="nofollow noreferrer">this</a>) the docker mounts are performed in lexicographic order (i.e shortest path first). According to this, I would expect docker first to execute the bind-mount (<code> -v /app:/opt/app</code>) and then the volume (<code>-v data:/opt/app/foo</code>). Hence, I would expect that the contents of host's <code>/app</code> would replace/obscure the contents of container's <code>/opt/app</code> and thus <code>file-h1</code> to be inside <code>/opt/app/foo</code>. Finally, <code>file-h1</code> would be <a href="https://docs.docker.com/engine/admin/volumes/#tips-for-using-bind-mounts-or-volumes" rel="nofollow noreferrer">copied</a> in the newly created <code>data</code> volume and the volume would be mounted on <code>/opt/app/foo</code> (so <code>file-h1</code> should be shown instead of <code>file-c1</code> ) My questions raised when I tried to understand <a href="https://stackoverflow.com/a/38601156/2235814">this</a> answer on SO

47,873,699

1

0

null

2017-12-13 14:51:49.24 UTC

11

2021-11-23 07:34:58.123 UTC

null

2,235,814

null

2,235,814

null

1

17

docker|docker-compose

3,612

Finally, and with a lot of help by github user <a href="https://github.com/moby/moby/issues/19120#issuecomment-352450375" rel="noreferrer">cpuguy83</a>, I figured out what actually docker engine does when we try to run a container that uses multiple mounts of different type (e.g both a bind-mount and a volume) as, for instance: <pre><code>docker container run \ -v /app:/opt/app \ -v data:/opt/app/foo myrepo/app </code></pre> The key point to understand here is that docker executes the process in two steps that are done in the following order: <ol> <li>First, it creates a new storage-space (i.e. volume) in the host filesystem (<code>... data/</code>) for the container to persist files and then (since that newly created volume is empty) it <a href="https://docs.docker.com/engine/admin/volumes/#good-use-cases-for-tmpfs-mounts" rel="noreferrer">copies</a> the container's files (i.e whatever is inside <code>/opt/app/foo/*</code>) to the volume's storage location (<code>... data/</code>)</li> <li>Then after that, it performs all mounts (binds, volumes, tmpfs mounts, etc... are all lumped together) in lexicographic order (first mounts <code>/app</code> to <code>/opt/app</code> then <code>... data/</code> to <code>/opt/app/foo</code>)</li> </ol> So, because of that, when we run the container with the mounts in our example, the docker first will copy the <code>file-c1</code> to the <code>... data/</code> location in the host filesystem and second it will mount first the contents of host's <code>/app</code> to the container's <code>/opt/app</code> and then the host's <code>... data/</code> (which contains <code>file-c1</code>) to container's <code>/opt/app/foo</code> overwriting/obscuring its contents (i.e overwriting <code>file-h1</code> with <code>file-c1</code>). Therefore, if we take a look inside the running container after the mounts are done, the result will be the following: <pre><code>opt |-- app | |-- index.php | |-- foo | | `-- file-c1 | `-- bar | `-- file-h2 </code></pre>

46,837,936

ORA-00909: invalid number of arguments

Maybe I am putting the parenthesis wrong or a wrong comma? I know this is a fairly novice question so I apologize in advance. I originally had this code: <pre><code>es3.last_name || ', ' ||SUBSTR(es3.first_name,1,1) </code></pre> But es3 was a Left Outer Join so all the blanks were showing the ', ' so I tried this below and am getting the ERROR <blockquote> ORA-00909: invalid number of arguments </blockquote> <pre><code>NVL(es3.last_name, ' ' , es3.last_name || ', ' ||SUBSTR(es3.first_name,1,1)) </code></pre> Thanks!

46,838,032

3

0

null

2017-10-19 19:55:21.66 UTC

null

2017-10-19 20:34:51.593 UTC

null

330,315

null

7,512,210

null

1

4

sql|oracle

46,714

From the documentation: <blockquote> The syntax for the NVL function in Oracle/PLSQL is: <code>NVL( string1, replace_with )</code> </blockquote> You are feeding it 3 arguments, hence the error message. I believe you want this instead: <pre><code>CASE WHEN es3.last_name IS NULL THEN '' ELSE es3.last_name || ', ' ||SUBSTR(es3.first_name,1,1) END </code></pre>

5,936,181

gcc -g vs not -g and strip vs not strip, performance and memory usage?

If binary file size is not an issue, are there any drawbacks using -g and not strip binaries that are to be run in a performance critical environment? I have a lot of disk space but the binary is cpu intensive and uses a lot of memory. The binary is loaded once and is alive for several hours. EDIT: The reason why I want to use binaries with debugging information is to generate useful core dumps in case of segmentation faults.

5,936,606

1

2

null

2011-05-09 11:22:58.797 UTC

15

2011-05-09 12:04:04.02 UTC

2011-05-09 11:33:45.23 UTC

null

300,963

null

300,963

null

1

40

c|optimization|gcc|strip

6,373

The ELF loader loads segments, not sections; the mapping from sections to segments is determined by the linker script used for building the executable. The default linker script does not map debug sections to any segment, so this is omitted. Symbol information comes in two flavours: static symbols are processed out-of-band and never stored as section data; dynamic symbol tables are generated by the linker and added to a special segment that is loaded along with the executable, as it needs to be accessible to the dynamic linker. The <code>strip</code> command only removes the static symbols, which are never referenced in a segment anyway. So, you can use full debug information through the entire process, and this will not affect the size of the executable image in RAM, as it is not loaded. This also means that the information is not included in core dumps, so this does not give you any benefit here either. The <code>objcopy</code> utility has a special option to copy only the debug information, so you can generate a second ELF file containing this information and use stripped binaries; when analyzing the core dump, you can then load both files into the debugger: <pre><code>objcopy --only-keep-debug myprogram myprogram.debug strip myprogram </code></pre>

25,291,607

Symfony2 - How to stop Form->handleRequest from nulling fields that don't exist in post data

I've got a form built in Symfony and when rendered in the view, the html form may or may not contain all of the fields in the form object (the entity sort of has a couple of different states and not all fields are rendedered in the view). The problem is that when the form is processed in the submit handler, via handleRequest() method of the form object, it resets any properties in the entity that are not present in the post data to null, blowing away any existing value. Is there any way to tell Symfony not to be so stupid and only process the fields present in the POST data? Or do I have to clone the entity before the handleRequest call and then loop over the POST values and copy the related values from the post-handleRequest entity over to the pre-handleRequest clone of the entity, so I preserve the fields that are not in the POST data. phew! as you can see, its a bit of a daft solution, to a bit of a daft problem, tbh. I could understand symfony doing this if the entity was in effect a newly created object, but its been loaded from the DB and then handleRequest called - it should be sensible enough to know the object has already been initialised and only set the fields passed in the POST data. Thanks for any help. Regards Steve.

25,295,370

2

0

null

2014-08-13 16:37:31.1 UTC

7

2014-08-13 21:12:03.18 UTC

null

1,484,864

null

1

30

php|forms|symfony

12,819

In short, don't use <code>handleRequest</code>. You should use <code>submit</code> directly instead along with the <code>clearMissing</code> parameter set to false. <kbd>Symfony/Component/Form/FormInterface</kbd> <pre><code>/** * Submits data to the form, transforms and validates it. * * @param null|string|array $submittedData The submitted data. * @param bool $clearMissing Whether to set fields to NULL * when they are missing in the * submitted data. * * @return FormInterface The form instance * * @throws Exception\AlreadySubmittedException If the form has already been submitted. */ public function submit($submittedData, $clearMissing = true); </code></pre> When you use <code>handleRequest</code> it works out what data you are wanting the submit and then submits it using <code>$form->submit($data, 'PATCH' !== $method);</code>, meaning that unless you have submitted the form using the <code>PATCH</code> method then it will clear the fields. To submit the form yourself without clearing your can use... <pre><code>$form->submit($request->get($form->getName()), false); </code></pre> .. which get the form data array from the request and submit it directly, but with the clear missing fields parameter set to false.

25,163,593

Matplotlib chart does not display in PyCharm

I run the following code in PyCharm 3.4.1, and it highlighted <code>%matplotlib inline</code> showing syntax error, and I delete the first line, and run, I expect it will prompt me some charts, but it runs normally with <code>Process finished with exit code 0</code>， and no charts is showing. My question is: 1. What is <code>%matplotlib inline</code> use for; 2. How to let pycharm shows matplotlib chart? <pre><code>%matplotlib inline from IPython.core.pylabtools import figsize import numpy as np from matplotlib import pyplot as plt figsize(11, 9) import scipy.stats as stats dist = stats.beta n_trials = [0, 1, 2, 3, 4, 5, 8, 15, 50, 500] data = stats.bernoulli.rvs(0.5, size=n_trials[-1]) x = np.linspace(0, 1, 100) # For the already prepared, I'm using Binomial's conj. prior. for k, N in enumerate(n_trials): sx = plt.subplot(len(n_trials) / 2, 2, k + 1) plt.xlabel("$p$, probability of heads") \ if k in [0, len(n_trials) - 1] else None plt.setp(sx.get_yticklabels(), visible=False) heads = data[:N].sum() y = dist.pdf(x, 1 + heads, 1 + N - heads) plt.plot(x, y, label="observe %d tosses,\n %d heads" % (N, heads)) plt.fill_between(x, 0, y, color="#348ABD", alpha=0.4) plt.vlines(0.5, 0, 4, color="k", linestyles="--", lw=1) leg = plt.legend() leg.get_frame().set_alpha(0.4) plt.autoscale(tight=True) plt.suptitle("Bayesian updating of posterior probabilities", y=1.02, fontsize=14) plt.tight_layout() </code></pre>

25,163,682

6

0

null

2014-08-06 14:53:00.017 UTC

13

2022-04-25 19:48:31.467 UTC

null

1,497,720

null

1

35

python|matplotlib|pycharm

65,093

The <code>%</code> notation is for <a href="http://ipython.org/ipython-doc/dev/interactive/tutorial.html#magic-functions">magic functions</a>. The particular magic function and argument you reference, <code>%matplotlib inline</code>, is meant for an <a href="http://nbviewer.ipython.org/github/ipython/ipython/blob/1.x/examples/notebooks/Part%203%20-%20Plotting%20with%20Matplotlib.ipynb">IPython notebook</a> session. You will get a syntax error using magic functions in a normal python session. The <code>%matplotlib</code> magic function is meant to specify a backend for matplotlib and the argument <code>inline</code> will produce an error if you are not in an IPython notebook session. To show your plot you should use <code>plt.show</code> for an interactive window or <code>plt.savefig</code> to save it to file. For example, <pre><code>plt.show() </code></pre> or <pre><code>plt.savefig( 'myfig.png' ) </code></pre>

26,262,029

Objective C to Swift header file with multiple targets

I'm successfully calling my Swift classes from Objective C (for target 'MyApp') via the import statement: <pre><code>#import "MyApp-Swift.h" </code></pre> I've now created a new target called "MyAppLite" When I compile the new target, I get errors because "MyApp-Swift.h" is required by the code, but the compiler is creating "MyAppLite-Swift.h" So, I need to create a conditional Swift/ObjC header <code>#import</code> for the target I'm compiling against. How can this be done, or is there a better way?

27,411,394

7

0

null

2014-10-08 16:39:54.757 UTC

16

2021-03-10 08:35:31.467 UTC

2014-10-10 01:24:50.853 UTC

null

1,402,846

null

876,057

null

1

76

objective-c|swift|header-files|target

20,440

It is also possible to set the <code>Product Module Name</code> setting in <code>Build Settings</code> to be the same across your modules (I set it to <code>$(PROJECT_NAME)</code>), so that the <code><project>-Swift.h</code> file that is generated has the same name across all modules. This eliminates the need for adding/checking preprocessor macros.

24,856,811

Why iterator.remove does not throw ConcurrentModificationException

What does <code>iterator.remove()</code> do differently from <code>list.remove()</code>, so that iterator does not throw an exception and <code>list.remove()</code> does throw one? In the end, both are modifying the collection size. Please ignore multi-threading here. I am just talking about a for-each loop and an iterator loop. As far as I know, a for-each loop creates an iterator only internally. I am confused.

25,131,943

6

0

null

2014-07-21 02:10:50.793 UTC

12

2021-12-29 10:18:25.94 UTC

2019-10-06 12:22:51.98 UTC

null

8,075,923

null

2,419,434

null

1

23

java|collections|foreach|iterator

20,696

<code>ConcurrentModificationException</code> is not thrown by <code>Iterator.remove()</code> because that is the permitted way to modify an collection while iterating. This is what the <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Iterator.html#remove--" rel="nofollow noreferrer">javadoc</a> for <code>Iterator</code> says: <blockquote> Removes from the underlying collection the last element returned by this iterator (optional operation). This method can be called only once per call to next(). The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method. </blockquote> If you change the collection being iterated any other way, then you are liable to get an exception, depending on the implementation of iterator, and the collection (or whatever) that you are iterating. (Some collection classes won't give you a <code>ConcurrentModificationException</code>: check the respective javadocs to see how they specify the behavior of their iterators) You are also liable to get an exception if you have two iterators on the same collection, and you remove via one of them. <hr> <blockquote> What iterator.remove does different from list.remove that iterator does not throw exception while list.remove does throw? </blockquote> Reason #1. If you had a non-concurrent collection being updated simultaneously from two places on the same call stack, the behavior would break the design invariant for the iteration1. An iteration of a non-concurrent collection is guaranteed to see all of the elements in the collection exactly once. (By contrast, with concurrent collections these guarantees are relaxed.) Reason #2. Non-concurrent collection types are not implemented to be thread-safe. Therefore, you could have race conditions and memory anomalies if the collection and iterator are used to update the collection by different threads. This is not strong reason because you will have these problems anyway. However, having the updates happening in two different ways makes the problem worse. <hr> <blockquote> I am just talking about for-each loop and iterator loop. As far as I know for-each loop internally create iterator only. </blockquote> That is correct. A for-each loop is really just syntactic sugar for a <code>while</code> loop using an iterator. On the other hand, if you use a loop like this: <pre><code> for (int i = 0; i < list.size(); i++) { if (...) { list.remove(i); } } </code></pre> you won't get <code>ConcurrentModificationException</code>, but you will need to adjust the index variable for the elements that you delete, and updates by another thread are liable to cause you to skip elements or visit them more than once2. <hr> 1 - To achieve "exactly once" iteration behavior, when you remove an element via the collection object, the iterator data structure would need to be updated to keep it in step with what has happened to the collection. This is not possible in the current implementations because they don't keep links to the outstanding iterators. And if they did, they would need to use <code>Reference</code> objects or risk memory leaks. 2 - Or even get an <code>IndexOutOfBoundsException</code>. And if the collection is not concurrent / properly synchronized, you can get worse problems.

22,429,744

How to setup route for websocket server in express?

I have a setup similar to this one: <pre><code>var WebSocketServer = require("ws").Server, express = require("express"), http = require("http"), app = express(), server = http.createServer(app); app.post("/login", login); app.get("/...", callSomething); // ... server.listen(8000); var wss = new WebSocketServer({server: server}); wss.on("connection", function(ws){ // ... }); </code></pre> I would like to put the WebSocketServer under a specific path which may for instance be <code>"...com/whatever"</code>. The question is how can I set the path? Is it possible?

22,429,868

6

0

null

2014-03-15 21:08:26.937 UTC

26

2022-09-08 05:03:42.117 UTC

2017-03-10 01:48:21.773 UTC

null

3,000,068

null

1,244,005

null

1

66

javascript|node.js|express|websocket

104,270

You'll want to use the <code>path</code> option: <pre><code>var wss = new WebSocketServer({server: server, path: "/hereIsWS"}); </code></pre> See full documentation <a href="https://github.com/einaros/ws/blob/master/doc/ws.md" rel="noreferrer">here</a>

2,690,865

Visibility attribute question

What is the difference between <code>$("#myid").attr("style", "visibility: hidden")</code> and <code>$("#myid").css("visibility", "hidden")</code> ?

2,690,892

3

0

null

2010-04-22 12:52:23.22 UTC

6

2010-04-22 14:38:11 UTC

null

45,433

null

247,243

null

1

26

jquery|html|css

87,754

Doing this: <pre><code>$("#myid").attr("style", "visibility: hidden") </code></pre> Will leave only this style attribute, while doing this: <pre><code>$("#myid").css("visibility", "hidden") </code></pre> Will add (or set) this style attribute. Here's an example, the first will always result in this: <pre><code>style="visibility: hidden;" </code></pre> The second just adds <code>visibility</code> so your style may now be: <pre><code>style="width: 50px; color: red; visibility: hidden;" </code></pre>

3,118,829

Why request.getRemoteAddr() returns ipv4 or ipv6 depending on context (post query or ajax query)

I've donne a web app with Spring/GWT that uses Flash to upload files. When I send an ajax request with GWT and try to get the user ip address, I get an ipv4 address like: 127.0.0.1 but when I upload my files with flash (and so a post request on the same webapp) I get an ipv6 address 0:0:0:0:0:0:0:1 I use the same code to get the user ip which is: <pre><code>ServletRequestAttributes att = (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes(); att.getRequest().getRemoteAddr(); </code></pre> The problem is that I use a signature which uses the ip address to be sure that user can upload files (due to bug with session lost when uploading with flash) and the ip address changes when I use ajax or Post via flash. What's the problem and how can I get the same ip format ? thanks

21,922,867

3

1

null

2010-06-25 14:31:52.46 UTC

13

2014-12-01 05:06:37.54 UTC

null

231,456

null

1

28

java|spring|jakarta-ee|ipv6|ipv4

37,515

You can fix it by starting your server with this flag <pre><code>-Djava.net.preferIPv4Stack=true </code></pre>

2,699,239

Dynamic attributes with Rails and Mongoid

I'm learning MongoDB through the Mongoid Ruby gem with Rails (Rails 3 beta 3), and I'm trying to come up with a way to create dynamic attributes on a model based on fields from another model, which I thought a schema-less database would be a good choice for. So for example, I'd have the models: <pre><code>class Account include Mongoid::Document field :name, :type => String field :token, :type => String field :info_needed, :type => Array embeds_many :members end class Member include Mongoid::Document embedded_in :account, :inverse_of => :members end </code></pre> I'm looking to take the "info_needed" attribute of the Account model and created dynamic attributes on the Member model based on what's inside. If club.info_needed was ["first_name", "last_name"], I'm trying to create a form that would save first_name and last_name attributes to the Member model. However, upon practice, I just keep getting "undefined method first_name=" errors on the Member model when trying to do this. I know MongoDB can handle dynamic attributes per record, but how can I get Mongoid to do this without an undefined method error?

2,897,708

4

1

null

2010-04-23 14:16:26.77 UTC

12

2012-07-23 00:16:59.673 UTC

null

227,528

null

1

15

ruby-on-rails|mongodb|mongoid|dynamic-attributes

19,451

Mongoid doesn't really support it. I happen to have <a href="http://groups.google.com/group/mongoid/browse_thread/thread/bbab975df6a40c7/632792f360f68d3d?lnk=gst&q=dynamic#632792f360f68d3d" rel="nofollow noreferrer">asked</a> this at Mongoid group myself. It is possible when you create new document, like this: <code>account = Account.new(:some_dynamic_field => "...")</code>

2,363,458

StructureMap singleton usage (A class implementing two interface)

<pre><code>public interface IInterface1 { } public interface IInterface2 { } public class MyClass : IInterface1, IInterface2 { } ... ObjectFactory.Initialize(x => { x.For<IInterface1>().Singleton().Use<MyClass>(); x.For<IInterface2>().Singleton().Use<MyClass>(); }); var x = ObjectFactory.GetInstance<IInterface1>(); var y = ObjectFactory.GetInstance<IInterface2>(); </code></pre> I get two different MyClass instances with the above code. How can I get one?

2,366,838

4

0

null

2010-03-02 13:43:23.863 UTC

12

2012-04-04 11:49:05.493 UTC

2010-03-02 13:44:21.617 UTC

null

20,402

James

null

1

37

c#|singleton|structuremap

15,831

You can use the Forward<,>() registration to tell StructureMap to resolve a type using the resolution of a different type. This should do what you expect: <pre><code>ObjectFactory.Initialize(x => { x.For<IInterface1>().Singleton().Use<MyClass>(); x.Forward<IInterface1, IInterface2>(); }); </code></pre>

31,727,049

Let user delete a selected fabric js object

I have a simple fabric js based application where I will let users add shapes connect them and animate them. Following is my JS <pre><code>var canvas; window.newAnimation = function(){ canvas = new fabric.Canvas('canvas'); } window.addRect = function(){ var rect = new fabric.Rect({ left: 100, top: 100, fill: 'red', width: 20, height: 20, }); canvas.add(rect); } window.addCircle = function(){ var circle = new fabric.Circle({ radius: 20, fill: 'green', left: 100, top: 100 }); canvas.add(circle); } </code></pre> This is my <a href="http://jsfiddle.net/wwerpuj9/" rel="noreferrer">Fiddle</a>. You can click on new animation and then add objects as of now. I want the user to select some object and then also be able to delete it I am not sure how. I found this <a href="https://stackoverflow.com/questions/11829786/delete-multiple-objects-at-once-on-a-fabric-js-canvas-in-html5">Delete multiple Objects at once on a fabric.js canvas in html5</a> But i was not able to implement it successfully. I basically want users to be able to select an object and delete it.

31,728,950

8

0

null

2015-07-30 14:49:41.987 UTC

7

2022-04-24 04:21:52.913 UTC

2017-05-23 11:54:43.123 UTC

user5049061

-1

user5049061

null

1

37

javascript|html|canvas|fabricjs

47,837

Edit: This is for older versions now. You can use the remove() method, eg. <pre><code>window.deleteObject = function() { canvas.getActiveObject().remove(); } </code></pre> <a href="http://jsfiddle.net/wwerpuj9/2/" rel="noreferrer">jsfiddle</a>