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

38,003,836

Pyspark: groupby and then count true values

My data structure is in JSON format: <pre><code>"header"{"studentId":"1234","time":"2016-06-23","homeworkSubmitted":True} "header"{"studentId":"1234","time":"2016-06-24","homeworkSubmitted":True} "header"{"studentId":"1234","time":"2016-06-25","homeworkSubmitted":True} "header"{"studentId":"1236","time":"2016-06-23","homeworkSubmitted":False} "header"{"studentId":"1236","time":"2016-06-24","homeworkSubmitted":True} .... </code></pre> I need to plot a histogram that shows number of homeworkSubmitted: True over all stidentIds. I wrote code that flattens the data structure, so my keys are header.studentId, header.time and header.homeworkSubmitted. I used keyBy to group by studentId: <pre><code> initialRDD.keyBy(lambda row: row['header.studentId']) .map(lambda (k,v): (k,v['header.homeworkSubmitted'])) .map(mapTF).groupByKey().mapValues(lambda x: Counter(x)).collect() </code></pre> This gives me result like this: <pre><code>("1234", Counter({0:0, 1:3}), ("1236", Counter(0:1, 1:1)) </code></pre> I need only number of counts of 1, possibly mapped to a list so that I can plot a histogram using matplotlib. I am not sure how to proceed and filter everything. Edit: at the end I iterated through the dictionary and added counts to a list and then plotted histogram of the list. I am wondering if there is a more elegant way to do the whole process I outlined in my code.

38,014,672

3

1

null

2016-06-24 00:14:13.3 UTC

1

2016-06-24 14:51:18.963 UTC

2016-06-24 04:38:41.643 UTC

null

2,952,335

null

2,952,335

null

1

10

apache-spark|pyspark

66,299

<pre><code>df = sqlContext.read.json('/path/to/your/dataset/') df.filter(df.homeworkSubmitted == True).groupby(df.studentId).count() </code></pre> Note it is not valid JSON if there is a <code>"header"</code> or <code>True</code> instead of <code>true</code>

37,073,774

Using lodash push to an array only if value doesn't exist?

I'm trying to make an array that if a value doesn't exist then it is added but however if the value is there I would like to remove that value from the array as well. Feels like Lodash should be able to do something like this. I'm interested in your best practises suggestions. Also it is worth pointing out that I am using Angular.js * Update * <pre><code>if (!_.includes(scope.index, val)) { scope.index.push(val); } else { _.remove(scope.index, val); } </code></pre>

37,073,878

9

2

null

2016-05-06 13:33:20.79 UTC

6

2022-04-21 23:17:38.05 UTC

2017-08-15 12:36:43.75 UTC

null

1,093,582

null

5,070,590

null

1

70

javascript|arrays|angularjs|lodash

117,587

The <code>Set</code> feature introduced by ES6 would do exactly that. <pre><code>var s = new Set(); // Adding alues s.add('hello'); s.add('world'); s.add('hello'); // already exists // Removing values s.delete('world'); var array = Array.from(s); </code></pre> Or if you want to keep using regular Arrays <pre><code>function add(array, value) { if (array.indexOf(value) === -1) { array.push(value); } } function remove(array, value) { var index = array.indexOf(value); if (index !== -1) { array.splice(index, 1); } } </code></pre> Using vanilla JS over Lodash is a good practice. It removes a dependency, forces you to understand your code, and often is more performant.

17,970,313

using knockout to set css class with an if condition

I want to set a bootstrap css class to a span with if condition (up to the binded value). I have <code>isApproved</code> field in a list, I want to see the field with 'label-success' class when its active and 'label-important' class when its inactive I added this line, but all the time it's taking the first class <pre><code>data-bind=" text: isApproved, css: isApproved = 'true' ? 'label label-important' : 'label label-important'" </code></pre> Is it possible in the html or I should add a computed field on my VM?

17,970,610

2

1

null

2013-07-31 12:22:58.833 UTC

4

2021-07-20 09:31:26.143 UTC

null

3,687,463

null

171,082

null

1

40

knockout.js

36,754

If I understood you right, this is the binding you are looking for. <pre><code> data-bind="text: isApproved, css: { 'label' : true, 'label-success' : isApproved(), 'label-important': !isApproved() }" </code></pre> I hope it helps.

17,758,401

How to create Categories in Rails

i'm trying to Add Categories to my Rails app, but don't quite know how to do this. I have many Pins(Images) and want the user to be able to assign a category on those Pins. ASSIGN not create, edit, or delete a Category, just selecting one for their Pin. Meaning that, When a user uploads a pin, he can choose from a dropdown list a Category. Then, another user can choose from the Menu a Category, and ONLY the Pins in this Category will be listed. How do i do this? Where to start ? Thank you

17,758,936

2

0

null

2013-07-20 03:39:44.953 UTC

15

2016-03-26 16:53:15.583 UTC

2013-07-20 07:29:18.39 UTC

null

1,609,496

null

1,609,496

null

1

8

ruby-on-rails|model-view-controller|controller|categories

12,982

First If you don't want to manage categories in your application, then you can simply add a category field in your table and category select in your application : <pre><code><%= f.select :category, [ 'Box', 'Cover', 'Poster' ], :prompt => 'Select One' %> </code></pre> Second, If you want to manage categories in your application, than you have to maintain a separate model and table for it. So you can start with generating your model: <pre><code>rails g model category </code></pre> it will add model and migration in your application directory. Add stuff to your migration: <pre><code>class CreateCategories < ActiveRecord::Migration def change create_table :categories do |t| t.string :name t.text :description ## you can add more stuff as per your requirements t.timestamps end end end </code></pre> Define associations in category & Pin model add validation for this :- <pre><code>In Category Model: has_many :pins In Pin Model : belongs_to :category validates :category, presence: true </code></pre> Create some categories by categories controller and form (I don't think, I need to tell you that stuff, you are able to do it yourself) In your pin uploading form add this select :- <pre><code><%= f.select :category, Category.all, :prompt => "Select One" %> </code></pre> Hope, It will help.

3,895,692

What does `unsigned` in MySQL mean and when to use it?

What does "unsigned" mean in MySQL and when should I use it?

3,895,705

1

0

null

2010-10-09 04:20:58.18 UTC

72

2019-08-21 14:47:32.277 UTC

2019-01-18 13:48:53.307 UTC

null

1,480,391

null

697,684

null

1

304

mysql|types

216,585

<a href="http://dev.mysql.com/doc/refman/5.7/en/numeric-type-attributes.html" rel="noreferrer">MySQL</a> says: <blockquote> All integer types can have an optional (nonstandard) attribute UNSIGNED. Unsigned type can be used to permit only nonnegative numbers in a column or when you need a larger upper numeric range for the column. For example, if an INT column is UNSIGNED, the size of the column's range is the same but its endpoints shift from -2147483648 and 2147483647 up to 0 and 4294967295. </blockquote> When do I use it ? Ask yourself this question: Will this field ever contain a negative value? If the answer is no, then you want an <code>UNSIGNED</code> data type. A common mistake is to use a primary key that is an auto-increment <code>INT</code> starting at zero, yet the type is <code>SIGNED</code>, in that case you’ll never touch any of the negative numbers and you are reducing the range of possible id's to half.

3,224,312

How can variables be set to NULL under the strict pragma?

<pre><code>use strict; my $var = NULL; </code></pre> will raise an error of <code>Bareword "NULL" not allowed while "strict subs" in use</code>

3,224,318

1

0

null

2010-07-11 19:13:42.833 UTC

6

2015-09-22 19:33:15.77 UTC

2010-07-12 06:34:04.537 UTC

null

133,939

null

312,483

null

1

50

perl

63,456

There's no NULL in Perl. However, variables can be <a href="http://perldoc.perl.org/functions/undef.html" rel="noreferrer"><code>undef</code></a>ined, which means that they have no value set. Here're some examples of how you can get an undefined variable in Perl: <pre><code>my $var; # variables are undefined by default undef $var; # undef() undefines the value of a variable $var = undef; # same, using an alternative syntax </code></pre> To check for definedness of a variable, use <a href="http://perldoc.perl.org/functions/defined.html" rel="noreferrer"><code>defined()</code></a>, i.e. <pre><code>print "\$var is undefined\n" unless defined $var; </code></pre>

20,936,901

Combining Spannable with String.format()

Suppose you have the following string: <pre><code>String s = "The cold hand reaches for the %1$s %2$s Ellesse's"; String old = "old"; String tan = "tan"; String formatted = String.format(s,old,tan); //"The cold hand reaches for the old tan Ellesse's" </code></pre> Suppose you want to end up with this string, but also have a particular <a href="https://developer.android.com/reference/android/text/Spannable.html" rel="noreferrer"><code>Span</code></a> set for any word replaced by <code>String.format</code>. For instance, we also want to do the following: <pre><code>Spannable spannable = new SpannableString(formatted); spannable.setSpan(new StrikethroughSpan(), oldStart, oldStart+old.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); spannable.setSpan(new ForegroundColorSpan(Color.BLUE), tanStart, tanStart+tan.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); </code></pre> Is there a robust way of getting to know the start indices of <code>old</code> and <code>tan</code>? Note that just searching for 'old' returns the 'old' in 'cold', so that won't work. What will work, I guess, is searching for <code>%[0-9]$s</code> beforehand, and calculating the offsets to account for the replacements in <code>String.format</code>. This seems like a headache though, I suspect there might be a method like <code>String.format</code> that is more informative about the specifics of its formatting. Well, is there?

20,937,501

5

2

null

2014-01-05 17:41:29.553 UTC

11

2020-04-28 06:56:09.42 UTC

2014-01-05 18:34:32.787 UTC

null

2,556,111

null

673,206

null

1

31

android|spannablestring|spannable

12,012

Using Spannables like that is a headache -- this is probably the most straightforward way around: <pre><code>String s = "The cold hand reaches for the %1$s %2$s Ellesse's"; String old = "old"; String tan = "<strike>tan</strike>"; String formatted = String.format(s,old,tan); //The cold hand reaches for the old <strike>tan</strike> Ellesse's Spannable spannable = Html.fromHtml(formatted); </code></pre> Problem: this does not put in a <code>StrikethroughSpan</code>. To make the <code>StrikethroughSpan</code>, we borrow a custom <code>TagHandler</code> from <a href="https://stackoverflow.com/questions/4044509/android-how-to-use-the-html-taghandler">this question</a>. <pre><code>Spannable spannable = Html.fromHtml(text,null,new MyHtmlTagHandler()); </code></pre> <hr> MyTagHandler: <pre><code>public class MyHtmlTagHandler implements Html.TagHandler { public void handleTag(boolean opening, String tag, Editable output, XMLReader xmlReader) { if (tag.equalsIgnoreCase("strike") || tag.equals("s")) { processStrike(opening, output); } } private void processStrike(boolean opening, Editable output) { int len = output.length(); if (opening) { output.setSpan(new StrikethroughSpan(), len, len, Spannable.SPAN_MARK_MARK); } else { Object obj = getLast(output, StrikethroughSpan.class); int where = output.getSpanStart(obj); output.removeSpan(obj); if (where != len) { output.setSpan(new StrikethroughSpan(), where, len, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); } } } private Object getLast(Editable text, Class kind) { Object[] objs = text.getSpans(0, text.length(), kind); if (objs.length == 0) { return null; } else { for (int i = objs.length; i > 0; i--) { if (text.getSpanFlags(objs[i - 1]) == Spannable.SPAN_MARK_MARK) { return objs[i - 1]; } } return null; } } } </code></pre>

21,264,359

how to make hint disappear when edittext is touched?

In my application in android are many EditText fields. And I ran into a problem with hint. It is not disappearing when EditText is focused, but it disappears when I start to write something. How can this problem be fixed? Because I need the hint to disappear when the EditText field is touched. It is for example: <pre><code><EditText android:layout_width="260dp" android:layout_height="30dp" android:ems="10" android:inputType="text" android:id="@+id/driv_lic_num_reg" android:hint="@string/driver_license_numb" android:textColor="@color/black" android:textColorHint="@color/grey_hint" android:background="@drawable/input_field_background" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_margin="2dp" android:textCursorDrawable="@color/black" android:textSize="15dp" android:paddingLeft="10dp" android:nextFocusDown="@+id/pass_reg" android:imeOptions="actionNext" android:maxLines="1" android:maxLength="50" android:focusableInTouchMode="true"/> </code></pre>

21,264,550

12

3

null

2014-01-21 16:55:35.943 UTC

9

2020-04-05 21:42:41.273 UTC

2018-10-21 06:31:48.087 UTC

null

6,877,321

null

3,132,940

null

1

48

android|android-edittext|hint

47,275

Hint only disappears when you type in any text, not on focus. I don't think that there is any automatic way to do it, may be I am wrong. However, as a workaround I use the following code to remove hint on focus in EditText <pre><code>myEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() { public void onFocusChange(View v, boolean hasFocus) { if (hasFocus) myEditText.setHint(""); else myEditText.setHint("Your hint"); } }); </code></pre>

20,906,305

Import error cannot import name execute_manager in windows environment

I'll get you up to speed. I'm trying to setup a windows dev environment. I've successfully installed python, django, and virtualenv + virtualenwrapper(<a href="http://virtualenvwrapper.readthedocs.org/en/latest/install.html">windows-cmd installer</a>) <pre><code>workon env Python 2.7.6 (default, Nov 10 2013, 19:24:24) [MSC v.1500 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import django >>> django.VERSION (1,6,1, 'final',0) >>> quit() </code></pre> But when I run: <code>python manage.py runserver</code> from my cloned repository I get this error: <pre><code>Traceback (most recent call last)" File "manage.py", line 2, in (module) from django.core.management import execute_manager ImportError: cannot import name execute_manager </code></pre> Both python and django are added to my system variable PATH: <pre><code>...C:\Python27\;C:\Python27\Scripts\;C:\PYTHON27\DLLs\;C:\PYTHON27\LIB\;C:\Python27\Lib\site-packages\; </code></pre> I've also tried this with bash and powershell and I still get the same error. Is this a virtualenv related issue? Django dependence issue? Yikes. How do I fix this problem? Help me Stackoverflow-kenobi your my only hope.

20,906,461

3

null

2014-01-03 14:51:03.557 UTC

6

2018-03-22 15:29:04.487 UTC

null

908,392

null

1

38

python|django|virtualenv|virtualenvwrapper

57,791

<code>execute_manager</code> deprecated in Django 1.4 as part of the project layout refactor and was removed in 1.6 per the deprecation timeline: <a href="https://docs.djangoproject.com/en/1.4/internals/deprecation/#id3" rel="noreferrer">https://docs.djangoproject.com/en/1.4/internals/deprecation/#id3</a> To fix this error you should either install a compatible version of Django for the project or update the <code>manage.py</code> to new style which does not use <code>execute_manager</code>: <a href="https://docs.djangoproject.com/en/stable/releases/1.4/#updated-default-project-layout-and-manage-py" rel="noreferrer">https://docs.djangoproject.com/en/stable/releases/1.4/#updated-default-project-layout-and-manage-py</a> Most likely if your <code>manage.py</code> is not compatible with 1.6 then neither is the rest of the project. You should find the appropriate Django version for the project.

28,353,725

Java subtract LocalTime

I have two <code>LocalTime</code> objects: <pre><code>LocalTime l1 = LocalTime.parse("02:53:40"); LocalTime l2 = LocalTime.parse("02:54:27"); </code></pre> How can I found different in minutes between them?

28,353,857

4

1

null

2015-02-05 20:49:41.937 UTC

2

2016-03-02 12:35:55.883 UTC

null

465,137

null

1

48

java|localtime

38,842

Use <code>until</code> or <code>between</code>, as described by the <a href="http://docs.oracle.com/javase/8/docs/api/java/time/LocalTime.html#until-java.time.temporal.Temporal-java.time.temporal.TemporalUnit-">api</a> <pre><code>import java.time.LocalTime; import static java.time.temporal.ChronoUnit.MINUTES; public class SO { public static void main(String[] args) { LocalTime l1 = LocalTime.parse("02:53:40"); LocalTime l2 = LocalTime.parse("02:54:27"); System.out.println(l1.until(l2, MINUTES)); System.out.println(MINUTES.between(l1, l2)); } } </code></pre> <blockquote> 0 0 </blockquote>

8,916,532

java.lang.NoSuchMethodError: android.os.Bundle.getString

<pre><code>game.multiplayer = bundle.getString("multiplayer" ,null); </code></pre> is giving the error: <pre><code>java.lang.NoSuchMethodError: android.os.Bundle.getString </code></pre> Other methods like <pre><code> game.word.word = bundle.getStringArray("word"); </code></pre> work fine. Anyone any idea?

8,916,617

5

1

null

2012-01-18 19:56:31.603 UTC

4

2015-06-19 06:23:28.063 UTC

null

1,104,939

null

1

28

android

9,615

getString(key, defValue) was added in API 12. Use getString(key), as this will return null if the key doesn't exist.

19,737,436

Looping through each row in a datagridview

How do I loop through each row of a <code>DataGridView</code> that I read in? In my code, the rows won't bind to the next row because of the same productID, so the <code>DataGridView</code> won't move to a new row. It stays on the same row and overwrites the price (for some products, I have two prices). How do I loop through each row to show the same productID but have a different price? EX : 1 Hamburger has 2 prices -- $1 and $2. After looping through the data, the result should have 2 rows with the same product but different pricing. How do I do this? Below is my code: <pre><code>productID = odr["product_id"].ToString(); quantity = Double.Parse(odr["quantity"].ToString()); //processing data... key = productID.ToString(); if (key != key_tmp) { //update index... i++; //updating variable(s)... key_tmp = key; } if (datagridviews.Rows[i].Cells["qty"].Value != null) //already has value... { currJlh = Double.Parse(ddatagridviews.Rows[i].Cells["qty"].Value.ToString()); } else //not yet has value... { currQty = 0; } currQty += qty; //show data... datagridviews.Rows[i].Cells["price"].Value = cv.toAccountingCurrency_en(Double.Parse(odr["item_price"].ToString())); MessageBoxes.Show(i.ToString()); MessageBoxes.Show(datagridviews.Rows[i].Cells["price"].Value.ToString()); // in here there is two price that looped but won't showed in datagridviews </code></pre>

19,737,522

3

1

null

2013-11-02 00:10:39.137 UTC

5

2022-03-28 14:30:56.93 UTC

null

2,666,368

null

2,666,368

null

1

29

c#|loops|datagridview

193,707

You could loop through <code>DataGridView</code> using <code>Rows</code> property, like: <pre><code>foreach (DataGridViewRow row in datagridviews.Rows) { currQty += row.Cells["qty"].Value; //More code here } </code></pre>

1,195,111

C# MailTo with Attachment?

Currently I am using the below method to open the users outlook email account and populate an email with the relevant content for sending: <pre><code>public void SendSupportEmail(string emailAddress, string subject, string body) { Process.Start("mailto:" + emailAddress + "?subject=" + subject + "&body=" + body); } </code></pre> I want to however, be able to populate the email with an attached file. something like: <pre><code>public void SendSupportEmail(string emailAddress, string subject, string body) { Process.Start("mailto:" + emailAddress + "?subject=" + subject + "&body=" + body + "&Attach=" + @"C:\Documents and Settings\Administrator\Desktop\stuff.txt"); } </code></pre> However this does not seem to work. Does anyone know of a way which will allow this to work!? Help greatly appreciate. Regards.

1,195,153

4

1

null

2009-07-28 16:03:46.14 UTC

15

2017-04-15 17:52:29.803 UTC

2012-12-21 21:24:05.587 UTC

null

621,316

null

99,900

null

1

31

c#|attachment|mailto

82,397

mailto: doesn't officially support attachments. I've heard Outlook 2003 will work with this syntax: <pre><code><a href='mailto:[email protected]?Subject=SubjTxt&Body=Bod_Txt&Attachment=""C:\file.txt"" '> </code></pre> A better way to handle this is to send the mail on the server using <a href="http://msdn.microsoft.com/en-us/library/system.net.mail.attachment.aspx" rel="nofollow noreferrer">System.Net.Mail.Attachment</a>. <pre><code> public static void CreateMessageWithAttachment(string server) { // Specify the file to be attached and sent. // This example assumes that a file named Data.xls exists in the // current working directory. string file = "data.xls"; // Create a message and set up the recipients. MailMessage message = new MailMessage( "[email protected]", "[email protected]", "Quarterly data report.", "See the attached spreadsheet."); // Create the file attachment for this e-mail message. Attachment data = new Attachment(file, MediaTypeNames.Application.Octet); // Add time stamp information for the file. ContentDisposition disposition = data.ContentDisposition; disposition.CreationDate = System.IO.File.GetCreationTime(file); disposition.ModificationDate = System.IO.File.GetLastWriteTime(file); disposition.ReadDate = System.IO.File.GetLastAccessTime(file); // Add the file attachment to this e-mail message. message.Attachments.Add(data); //Send the message. SmtpClient client = new SmtpClient(server); // Add credentials if the SMTP server requires them. client.Credentials = CredentialCache.DefaultNetworkCredentials; try { client.Send(message); } catch (Exception ex) { Console.WriteLine("Exception caught in CreateMessageWithAttachment(): {0}", ex.ToString() ); } data.Dispose(); } </code></pre>

437,958

How can I exclude $(this) from a jQuery selector?

I have something like this: <pre><code><div class="content"> <a href="#">A</a> </div> <div class="content"> <a href="#">B</a> </div> <div class="content"> <a href="#">C</a> </div> </code></pre> When one of these links is clicked, I want to perform the .hide() function on the links that are not clicked. I understand jQuery has the :not selector, but I can't figure out how to use it in this case because it is necessary that I select the links using <code>$(".content a")</code> I want to do something like <pre><code>$(".content a").click(function() { $(".content a:not(this)").hide("slow"); }); </code></pre> but I can't figure out how to use the :not selector properly in this case.

437,979

4

1

null

2009-01-13 04:30:16.263 UTC

42

2018-09-20 14:59:18.333 UTC

null

1,264,804

Logan Serman

29,595

null

1

222

jquery|jquery-selectors|this

186,073

Try using the <a href="http://docs.jquery.com/Traversing/not" rel="noreferrer"><code>not()</code> method</a> instead of the <a href="http://docs.jquery.com/Selectors/not" rel="noreferrer"><code>:not()</code> selector</a>. <pre><code>$(".content a").click(function() { $(".content a").not(this).hide("slow"); }); </code></pre>

303,725

ASP.NET Application state vs a Static object

if i have a standard ASP.NET application, is there any difference between making an object static as opposed to putting the object instance in the Application state? from my understanding, both objects exist ONCE for the app domain. Secondly, what happens if you have a static object in a referenced dll, for an ASP.NET site. It's also part of the app domain, so it will always exist once?

303,787

1

null

2008-11-19 23:00:14.667 UTC

16

2008-11-19 23:23:46.79 UTC

null

Pure.Krome

30,674

null

1

41

asp.net|static-members|application-state

9,528

From: <a href="http://support.microsoft.com/default.aspx?scid=kb;en-us;Q312607" rel="noreferrer">http://support.microsoft.com/default.aspx?scid=kb;en-us;Q312607</a> <blockquote> ASP.NET includes application state primarily for compatibility with classic ASP so that it is easier to migrate existing applications to ASP.NET. It is recommended that you store data in static members of the application class instead of in the Application object. This increases performance because you can access a static variable faster than you can access an item in the Application dictionary. </blockquote> Also, yes, static variables behave the same way regardless of where they are loaded from, and exist exactly once per app domain (unless you're talking about those labeled [ThreadStatic])

42,230,304

Checking if a request array is empty in Laravel

I have a dynamically generated form that gives me an array of inputs. However the array might be empty, then the foreach will fail. <pre><code> public function myfunction(Request $request) { if(isset($request)) { #do something } } </code></pre> This obviously doesn't work since it is a $request object and is always set. I have no idea however how to check if there is any input at all. Any ideas?

42,231,131

5

0

null

2017-02-14 15:41:02.347 UTC

0

2022-01-03 12:22:10.37 UTC

null

4,485,955

null

1

7

php|arrays|laravel

39,250

I always do this with my installations by adding a function to the <code>Controller</code> in the <code>App\Http\Controllers</code> directory. <pre><code>use Illuminate\Http\Request; public function hasInput(Request $request) { if($request->has('_token')) { return count($request->all()) > 1; } else { return count($request->all()) > 0; } } </code></pre> Rather self explanatory, return true if other input variables outside of the <code>_token</code>, or return true if no <code>token</code> and contains other variables.

20,555,234

How does one stub promise with sinon?

I have a data service with following function <pre><code>function getInsureds(searchCriteria) { var deferred = $q.defer(); insuredsSearch.get(searchCriteria, function (insureds) { deferred.resolve(insureds); }, function (response) { deferred.reject(response); }); return deferred.promise; } </code></pre> I want to test following function: <pre><code>function search () { dataService .getInsureds(vm.searchCriteria) .then(function (response) { vm.searchCompleted = true; if (response.insureds.length > 100) { vm.searchResults = response.insureds.slice(0, 99); } else { vm.searchResults = response.insureds; } }); } </code></pre> How would I stub the promise so that when I call getInsureds it would resolve the promise and return me the results immediately. I started like this (jasmine test), but I am stuck, as I don't know how to resolve the promise and pass in arguments needed. <pre><code>it("search returns over 100 results searchResults should contain only 100 records ", function () { var results103 = new Array(); for (var i = 0; i < 103; i++) { results103.push(i); } var fakeSearchForm = { $valid: true }; var isSearchValidStub = sinon.stub(sut, "isSearchCriteriaValid").returns(true); var deferred = $q.defer(); var promise = deferred.promise; var dsStub = sinon.stub(inSearchDataSvc, "getInsureds").returns(promise); var resolveStub = sinon.stub(deferred, "resolve"); //how do i call resolve and pass in results103 sut.performSearch(fakeSearchForm); sinon.assert.calledOnce(isSearchValidStub); sinon.assert.calledOnce(dsStub); sinon.assert.called(resolveStub); expect(sut.searchResults.length).toBe(100); }); </code></pre>

20,614,500

5

0

null

2013-12-12 22:06:21.487 UTC

14

2018-07-31 10:51:31.46 UTC

2015-12-29 20:01:18.407 UTC

null

690,413

null

103,682

null

1

64

javascript|jasmine|sinon

94,783

You just have to resolve the promise before you call the search function. This way your stub will return a resolved promise and <code>then</code> will be called immediately. So instead of <pre><code>var resolveStub = sinon.stub(deferred, "resolve"); </code></pre> you will resolve the deferred with your fake response data <pre><code>deferred.resolve({insureds: results103}) </code></pre>

43,638,979

Understanding Gitlab CI tags

I've read documentation, some articles and you might call me dumb, but this is my first time working with a concept like this. <ul> <li>I've registered runner with tag "testing"</li> <li>created tag "testing" in gitlab</li> <li>binded this runner, with particular project </li> <li>I've also added the same tag e.g. "testing"in my local repo. </li> </ul> BUT how exactly is running my jobs dependent on those tags? Are all these operations necessary? If I push new code to repo, *.yml file is executed anyway as far as I tested. So what if I want to run build only when I define a version in a commit? IDK... <pre><code> git commit --tags "v. 2.0" -m "this is version 2.0" (probably not right) </code></pre> But of course it should be universal, so I don't have to always tell, which tag to use to trigger the runner, but for example let him recognize numeric values. As you can see, I'm fairly confused... If you could elaborate how exactly tags work, so I would be able to understand the concept, I would be really grateful.

43,745,896

3

0

null

2017-04-24 19:10:13.517 UTC

10

2021-09-09 15:38:18.92 UTC

null

RiddleMeThis

4,325,793

null

1

57

tagging|gitlab|yaml

102,722

Tags for GitLab CI and tags for Git are two different concepts. When you write your <code>.gitlab-ci.yml</code>, you can specify some jobs with the tag <code>testing</code>. If a runner with this tag associated is available, it will pickup the job. In Git, within your repository, tags are used to mark a specific commit. It is often used to tag a version. The two concepts can be mixed up when you use tags (in Git) to start your pipeline in GitLab CI. In your <code>.gitlab-ci.yml</code>, you can specify the section <code>only</code> with <code>tags</code>. Refer to <a href="https://docs.gitlab.com/ee/ci/yaml/#tags" rel="noreferrer">GitLab documentation for tags</a> and <a href="https://docs.gitlab.com/ee/ci/yaml/#only--except" rel="noreferrer">only</a>. An example is when you push a tag with git: <pre><code>$ git tag -a 1.0.0 -m "1.0.0" $ git push origin 1.0.0 </code></pre> And a job in <code>.gitlab-ci.yml</code> like this: <pre><code>compile: stage: build only: [tags] script: - echo Working... tags: [testing] </code></pre> would start using a runner with the <code>testing</code> tag. By my understanding, what is missing in your steps is to specify the tag <code>testing</code> to your runner. To do this, go in GitLab into your project. Next to Wiki, click on Settings. Go to CI/CD Pipelines and there you have your runner(s). Next to its Guid, click on the pen icon. On next page the tags can be modified.

44,936,028

Progress Bar with axios

I have to display the upload status of the file using a Progress Bar. I am using <code>axios</code> to make http requests. I followed the example from their github page <a href="https://github.com/mzabriskie/axios/blob/master/examples/upload/index.html" rel="noreferrer">https://github.com/mzabriskie/axios/blob/master/examples/upload/index.html</a> My code looks like this: <pre><code>this.store().then(() => { var form = new FormData(); form.append('video', this.file); form.append('uid', this.uid); axios.post('/upload', form, { progress: (progressEvent) => { if (progressEvent.lengthComputable) { console.log(progressEvent.loaded + ' ' + progressEvent.total); this.updateProgressBarValue(progressEvent); } } }) }); </code></pre> However, it is not executing the <code>console.log(progressEvent.loaded + ' ' + progressEvent.total);</code> at all nor is it calling <code>this.updateProgressBarValue(progressEvent);</code> How can I solve this??

44,937,301

4

0

null

2017-07-05 21:09:42.557 UTC

5

2021-04-30 23:46:15.657 UTC

2020-02-18 16:24:22.73 UTC

null

6,778,849

null

5,924,007

null

1

43

javascript|progress-bar|vuejs2|axios

78,274

I found the answer. The name of the event is <code>onUploadProgress</code> and I was using <code>progress</code>

29,018,842

RStudio enters debug mode for every function error - how can I stop it?

I've been using RStudio for years, and this has never happened to me before. For some reason, every time a function throws an error, RStudio goes into debug mode (I don't want it to). Even after using undebug() on a single function. <pre><code>> undebug(http.get) Warning message: In undebug(fun) : argument is not being debugged > x = http.get(country = 'KE') http --timeout=60 get "http://[email protected]/observation?country=KE" > freshobs.json </dev/null Error in fromJSON(file = "freshobs.json") : unexpected character 'O' Error in el[["product_name"]] : subscript out of bounds Called from: grepl(el[["product_name"]], pattern = "json:", fixed = T) Browse[1]> Q </code></pre> Any function I use that breaks causes debug mode to start - which is pretty annoying because it opens up a source viewer and takes you away from your code. Anybody know how to stop this functionality? This happens when the 'Use debug mode only when my code contains errors' check box in Preferences is and is not checked. Thanks!

32,330,588

5

0

null

2015-03-12 19:40:56.343 UTC

3

2020-04-23 14:43:25.29 UTC

null

2,521,469

null

1

38

r|debugging|rstudio

8,622

I tried fixing this issue by putting <code>options(error = NULL)</code> in my <code>.Rprofile</code>, but this did not work. What did work was to go to the <a href="https://support.rstudio.com/hc/en-us/articles/205612627-Debugging-with-RStudio#stopping-when-an-error-occurs">"Debug" -> "On Error" menu and select "Message only"</a>. This effectively is the same as setting <code>options(error = NULL)</code>, but it is persistent across restarts. <img src="https://support.rstudio.com/hc/en-us/article_attachments/201608428/break-in-code.png" alt="RStudio menu">

40,411,283

Laravel how to test if a checkbox is checked in a controller

I tried to get if checkbox is checked with: In my view: <pre class="lang-php prettyprint-override"><code><form data-toggle="validator" data-disable="false" role="form" action="/admin/role/add" method="post"> <div class="checkbox checkbox-success"> <input name="test" id="test" type="checkbox" value="test"> <label for="test" style="padding-left: 15px!important;">test</label> </div> </form> <form data-toggle="validator" data-disable="false" role="form" action="/admin/role/add" method="post"> {{ csrf_field() }} <div class="form-group pull-right"> <button type="submit" class="btn btn-danger">Submit</button> </div> </form> </code></pre> In my controller : <pre class="lang-php prettyprint-override"><code>public function createRole(Request $request) { if($request->has('test')) { new \App\Debug\Firephp('test', ['test' => true]); } } </code></pre> In my <code>web.php</code>: <pre class="lang-php prettyprint-override"><code>Route::post('/admin/role/add', 'AdminController@createRole') </code></pre> but doesn't work for some reason. How i can do? Thanks for reply. EDIT 1 : It was my form that was poorly build.

40,412,853

6

5

null

2016-11-03 21:09:33.743 UTC

null

2021-08-25 06:53:16.917 UTC

2020-08-25 08:28:31.143 UTC

null

7,047,493

null

7,047,493

null

1

10

php|laravel

64,288

I believe your real problem is that you have two separate forms. Your checkbox is in one form, your submit button is in a second form. I believe they both need to be in the same form. Otherwise your checkbox state is never returned, regardless of it's state. In your view, try replacing the form markup you provided with this: <pre><code><form data-toggle="validator" data-disable="false" role="form" action="/admin/role/add" method="post"> <div class="checkbox checkbox-success"> <input name="test" id="test" type="checkbox" value="test"> <label for="test" style="padding-left: 15px!important;">test</label> </div> {{ csrf_field() }} <div class="form-group pull-right"> <button type="submit" class="btn btn-danger">Submit</button> </div> </form> </code></pre>

20,461,165

How to convert index of a pandas dataframe into a column

This seems rather obvious, but I can't seem to figure out how to convert an index of data frame to a column? For example: <pre><code>df= gi ptt_loc 0 384444683 593 1 384444684 594 2 384444686 596 </code></pre> To, <pre><code>df= index1 gi ptt_loc 0 0 384444683 593 1 1 384444684 594 2 2 384444686 596 </code></pre>

20,461,206

8

1

null

2013-12-09 00:34:16.403 UTC

181

2022-09-24 18:16:41.613 UTC

2021-04-23 21:43:53.693 UTC

null

7,758,804

null

1,090,629

null

1

742

python|pandas|dataframe|indexing|series

1,050,432

either: <pre><code>df['index1'] = df.index </code></pre> or, <a href="https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reset_index.html" rel="noreferrer"><code>.reset_index</code></a>: <pre><code>df = df.reset_index(level=0) </code></pre> <hr /> so, if you have a multi-index frame with 3 levels of index, like: <pre><code>>>> df val tick tag obs 2016-02-26 C 2 0.0139 2016-02-27 A 2 0.5577 2016-02-28 C 6 0.0303 </code></pre> and you want to convert the 1st (<code>tick</code>) and 3rd (<code>obs</code>) levels in the index into columns, you would do: <pre><code>>>> df.reset_index(level=['tick', 'obs']) tick obs val tag C 2016-02-26 2 0.0139 A 2016-02-27 2 0.5577 C 2016-02-28 6 0.0303 </code></pre>

20,853,066

How to center form in bootstrap 3

How can I center my login form ? I'm using bootstrap column but it's not working. Here is my code: <pre><code><div class="container"> <div class="row"> <div class="col-md-4 col-md-offset-6"> <h2>Log in</h2> <div> <table> <tr> <td>1</td> <td>1</td> </tr> <tr> <td>2</td> <td>2</td> </tr> <tr> <td>3</td> <td>3</td> </tr> </table> </div> </div> </div> </div> </code></pre>

20,853,119

10

1

null

2013-12-31 06:42:57.17 UTC

21

2021-11-27 01:51:11.853 UTC

2015-11-11 07:50:54.65 UTC

null

3,885,376

null

2,836,246

null

1

66

html|css|twitter-bootstrap|twitter-bootstrap-3

309,886

A simple way is to add <pre><code>.center_div{ margin: 0 auto; width:80% /* value of your choice which suits your alignment */ } </code></pre> to you class <code>.container</code>.Add <code>width:xx %</code> to it and you get perfectly centered div! eg : <pre><code><div class="container center_div"> </code></pre> but i feel that by default <code>container</code> is centered in BS!

32,413,025

ES6 Destructuring in Class constructor

This may sound ridiculous but bear with me. I wonder if there is support on the language level to destructure object into class properties in constructor, e.g. <pre><code>class Human { // normally constructor({ firstname, lastname }) { this.firstname = firstname; this.lastname = lastname; this.fullname = `${this.firstname} ${this.lastname}`; } // is this possible? // it doesn't have to be an assignment for `this`, just something // to assign a lot of properties in one statement constructor(human) { this = { firstname, lastname }; this.fullname = `${this.firstname} ${this.lastname}`; } } </code></pre>

32,413,517

1

3

null

2015-09-05 12:25:52.963 UTC

7

2015-09-05 13:18:38.47 UTC

null

1,684,058

null

1

33

javascript|ecmascript-6|destructuring

20,512

You cannot assign to <code>this</code> anywhere in the language. One option is to merge into <code>this</code> or other object: <pre><code>constructor(human) { Object.assign(this, human); } </code></pre>

25,420,470

Limit the number of pages displayed in bootstrap 3 pagination

I have various web pages on my website which are using bootstraps (bootstrap 3) pagination but I need to know how to limit the number of pages displayed in it (e.g. display pages 1 to 10 only). If you then select page 2, page 11 would b displayed and so on. How do you do this? I know it will probably be JavaScript/jQuery but any help is appreciated. and if it can be done without having to use JavaScript/jQuery, then all the better. Below is a screenshot of my pagination. <img src="https://i.stack.imgur.com/MsLrm.png" alt="Current pagination"> As you can see there are 12 pages displayed, I would like pages 11 & 12 to be hidden until page 2 or the next page is selected then pages 11 would be displayed and pages one would be hidden, so on and so on.

25,421,197

4

3

null

2014-08-21 07:20:29.91 UTC

1

2018-08-24 17:19:40.45 UTC

2018-04-17 04:17:24.57 UTC

null

534,109

null

3,194,213

null

1

24

javascript|jquery|css|twitter-bootstrap|pagination

51,630

There is a jquery plugin to work with bootstrap, that solves this problem: <a href="http://josecebe.github.io/twbs-pagination/" rel="noreferrer">http://josecebe.github.io/twbs-pagination/</a> Have a look at the "visible pages option" section. You can find more/other solutions with google and <code>bootstrap 3 pagination many pages</code>.

39,644,638

How to take the nth digit of a number in python

I want to take the nth digit from an N digit number in python. For example: <pre><code>number = 9876543210 i = 4 number[i] # should return 6 </code></pre> How can I do something like that in python? Should I change it to string first and then change it to int for the calculation?

39,644,706

7

2

null

2016-09-22 16:46:31.04 UTC

7

2021-04-27 18:40:28.43 UTC

2016-09-23 01:00:04.697 UTC

null

3,254,859

null

6,865,397

null

1

57

python|int

183,964

First treat the number like a string <pre><code>number = 9876543210 number = str(number) </code></pre> Then to get the first digit: <pre><code>number[0] </code></pre> The fourth digit: <pre><code>number[3] </code></pre> EDIT: This will return the digit as a character, not as a number. To convert it back use: <pre><code>int(number[0]) </code></pre>

39,717,516

Why is System.Net.Http.HttpMethod a class, not an enum?

<code>HttpStatusCode</code> is implemented as an <code>enum</code>, with each possible value assigned to its corresponding HTTP status code (e.g. <code>(int)HttpStatusCode.Ok == 200</code>). However, <code>HttpMethod</code> is <a href="https://msdn.microsoft.com/en-us/library/system.net.http.httpmethod(v=vs.118).aspx" rel="noreferrer">implemented as a <code>class</code></a>, with static properties to get instances for the various HTTP verbs (<code>HttpMethod.Get</code>, <code>HttpMethod.Put</code> etc). What is the rationale behind not implementing <code>HttpMethod</code> as an <code>enum</code>?

39,717,699

2

null

2016-09-27 06:29:58.743 UTC

null

2021-08-18 13:05:02.493 UTC

2021-01-19 19:20:42.64 UTC

null

704,022

null

38,055

null

1

28

c#|language-design

16,576

From the <a href="https://msdn.microsoft.com/en-us/library/system.net.http.httpmethod(v=vs.110).aspx#Anchor_6">documentation</a> (emphasis mine): <blockquote> Remarks The most common usage of HttpMethod is to use one of the static properties on this class. However, if an app needs a different value for the HTTP method, the HttpMethod constructor initializes a new instance of the HttpMethod with an HTTP method that the app specifies. </blockquote> Which is of course not possible with an enum. See its <a href="https://msdn.microsoft.com/en-us/library/system.net.http.httpmethod.httpmethod(v=vs.110).aspx">constructor</a> and <a href="https://msdn.microsoft.com/en-us/library/system.net.http.httpmethod.method(v=vs.110).aspx">method property</a>.

31,446,603

How to make type cast for python custom class

Consider a class; <pre><code>class temp: def __init__(self): pass </code></pre> I make an object of it; <pre><code>obj = temp() </code></pre> Convert it to string; <pre><code>strObj = str(obj) </code></pre> Now, how can i convert strObj to an object of temp class?? <pre><code>org = temp(strObj) </code></pre>

31,447,048

6

7

null

2015-07-16 06:19:43.203 UTC

1

2021-09-07 02:02:00.89 UTC

null

2,177,330

null

1

15

python|class|python-2.7|casting

38,051

As noted by Anand in comments, what you're looking for is object serialization and deserialization. One way to achieve this is through the pickle (or cPickle) module: <pre><code>>>> import pickle >>> class Example(): ... def __init__(self, x): ... self.x = x ... >>> a = Example('foo') >>> astr = pickle.dumps(a) # (i__main__\nExample\np0\n(dp1\nS'x'\np2\nS'foo'\np3\nsb. >>> b = pickle.loads(astr) >>> b <__main__.Example instance at 0x101c89ea8> >>> b.x 'foo' </code></pre> Note, however, that one gotcha in using the pickle module is dealing with implementation versions. As suggested in the Python docs, if you want an unpickled instance to automatically handle implementation versioning, you may want to add a version instance attribute and add a custom __setstate__ implementation: <a href="https://docs.python.org/2/library/pickle.html#object.__setstate__" rel="nofollow">https://docs.python.org/2/library/pickle.html#object.setstate</a>. Otherwise, the version of the object at serialization time will be exactly what you get at deserialization time, regardless of code changes made to the object itself.

31,431,341

SQL Adding a column to a table, with case statement

I have my case statement but would like to add the new column "Unit_Type" to the table... <pre><code>Unit_type =(case [INSP_UNIT_TYPE_ID] when '9' then 'Semi Trailer' when '7' then 'Pole Trailer' when '6' then 'Other' when '5' then 'Motor Carrier' when '3' then 'Full Trailer' when '2' then 'Dolly Converter' when '14' then 'Intermodal Chassis' when '12' then 'Van' when '11' then 'Truck Tractor' when '10' then 'Straight Truck' else 'Invalid' end) from [dbo].[Insp_Unit_Pub_01012015_05282015]; </code></pre>

31,432,451

2

8

null

2015-07-15 13:10:19.187 UTC

3

2015-07-15 14:27:13.147 UTC

2015-07-15 13:10:42.603 UTC

null

2,686,013

null

5,119,519

null

1

2

sql

42,081

don't do that and use a view. the above suggestion is the result of a wild guess because you provide neither context nor database structure so it may be plain wrong or not suitable for your situation. your untold requirement looks like some kind of visualization of the table with human readable data and that's what views are good for. create a view adding the required joins or including the CASE statement you are trying to put in the table (check the syntax ^^): <pre><code>CREATE VIEW [name of the view here] AS SELECT field1, field2, field3, Unit_type = CASE [INSP_UNIT_TYPE_ID] WHEN '9' THEN 'Semi Trailer' WHEN '7' THEN 'Pole Trailer' WHEN '6' THEN 'Other' WHEN '5' THEN 'Motor Carrier' WHEN '3' THEN 'Full Trailer' WHEN '2' THEN 'Dolly Converter' WHEN '14' THEN 'Intermodal Chassis' WHEN '12' THEN 'Van' WHEN '11' THEN 'Truck Tractor' WHEN '10' THEN 'Straight Truck' ELSE 'Invalid' END FROM [dbo].[Insp_Unit_Pub_01012015_05282015]; </code></pre> as suggested by some comment you may put a <code>JOIN</code> in the query instead of the <code>CASE</code> statement if the human readable text comes from a lookup table.

6,800,467

Quotes in XML. Single or double?

I've heard that using single quotes to surround XML attribute values is a "bad style". Is this correct? Should I always write: <pre><code><element attr="value"> </code></pre> Or is it acceptable to write: <pre><code><element attr='value'> </code></pre> Or does it not matter which style I use?

6,800,482

2

null

2011-07-23 12:50:12.557 UTC

4

2017-11-15 17:53:49.19 UTC

null

3,357,935

null

377,133

null

1

80

xml|formatting

36,697

Both are legal. Choose one and stick with it. It doesn't matter. From the <a href="http://www.w3.org/TR/xml/#NT-AttValue">spec</a>: <pre><code>AttValue ::= '"' ([^<&"] | Reference)* '"' | "'" ([^<&'] | Reference)* "'" </code></pre> Showing that both are valid, as is mixing the two styles within an element, per attribute (though I suggest being consistent within any single document/set of documents).

7,097,374

PHP "pretty print" json_encode

<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/6054033/pretty-printing-json-with-php">Pretty-Printing JSON with PHP</a> </blockquote> I'm working on a script that creates a JSON file. Right now I'm just using <code>json_encode</code> (PHP 5.2.x) to encode an array into JSON output. Then I print the returned value to a file and save it. Problem is that the client wants to be able to open these JSON files for readability, so I'd like to add line breaks in and "pretty print" the JSON output. Any ideas on how to do this? My only other alternative that I can see is to not use <code>json_encode</code> at all and just write the file contents manually and add in my own line breaks for each line. Here's what I get: <pre><code>{"product_name":"prod1","val1":1,"val2":8} </code></pre> Here's what I want: <pre><code>{ "product_name":"prod1", "val1":1, "val2":8 } </code></pre> I suppose I could also just replace every comma with a command followed by a \n, and same for the brackets... Thoughts?

13,638,998

3

2

null

2011-08-17 18:06:21.567 UTC

27

2019-01-26 03:51:21.903 UTC

2017-05-23 11:54:40.827 UTC

null

-1

null

899,199

null

1

152

php|json|encode

189,893

PHP has JSON_PRETTY_PRINT option since 5.4.0 (release date 01-Mar-2012). This should do the job: <pre><code>$json = json_decode($string); echo json_encode($json, JSON_PRETTY_PRINT); </code></pre> See <a href="http://www.php.net/manual/en/function.json-encode.php" rel="noreferrer">http://www.php.net/manual/en/function.json-encode.php</a> Note: Don't forget to echo "<pre>" before and "</pre>" after, if you're printing it in HTML to preserve formatting ;)

7,099,191

jquery .show('slow') direction?

Is it possible to change direction of <code>$("selector").show('slow')</code> and <code>hide('slow')</code> effects in jQuery? I can define directions for other effects such as slide and clip, but there's no option for show or <code>hide('slow')</code>

7,099,260

4

0

null

2011-08-17 20:40:28.107 UTC

2

2014-08-05 12:13:10.55 UTC

2011-08-17 20:42:15.337 UTC

null

871,050

null

100,240

null

1

26

jquery|show|direction

59,663

<code>show()</code> is just an arbitrary function to display an element on a page. Without the argument it wouldn't even have an animation. If you want access to more elaborate animations and control the direction it fades in on you will need to use <a href="http://api.jquery.com/animate/"><code>.animate()</code></a> Or use an extra library that extends jQuery's native functions like <a href="http://jqueryui.com/">jQuery UI</a> <code>show()</code> on itself doesn't have any extra effects though..

7,461,265

how to use views in code first entity framework

How can I use the database view in entity framework code first,

9,351,059

4

3

null

2011-09-18 11:48:58.043 UTC

33

2022-01-18 12:10:31.913 UTC

2015-06-22 18:54:10.75 UTC

null

2,686,013

null

518,708

null

1

99

.net|database|entity-framework|view|code-first

111,972

If, like me, you are interested only in mapping entity coming from an other database (an erp in my case) to relate them to entities specific of your application, then you can use the views as you use a table (map the view in the same way!). Obviously, if you try to update that entities, you will get an exception if the view is not updatable. The procedure is the same as in the case of normal (based on a table) entities: <ol> <li>Create a POCO class for the view; for example FooView </li> <li>Add the DbSet property in the DbContext class </li> <li>Use a FooViewConfiguration file to set a different name for the view (using ToTable("Foo"); in the constructor) or to set particular properties <pre><code>public class FooViewConfiguration : EntityTypeConfiguration<FooView> { public FooViewConfiguration() { this.HasKey(t => t.Id); this.ToTable("myView"); } } </code></pre> </li> <li>Add the FooViewConfiguration file to the modelBuilder, for example overriding the OnModelCreating method of the Context: <pre><code>protected override void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Configurations.Add(new FooViewConfiguration ()); } </code></pre> </li> </ol>

21,803,830

Why is the range object "not an iterator"?

I wrote this and expected <code>0</code>: <pre><code>>>> x = range(20) >>> next(x) </code></pre> Instead I got: <blockquote> TypeError: 'range' object is not an iterator </blockquote> But I thought it was a generator? The initial answer yielded the same thing I initially said to myself: it's an iterable, not an interator. But then, that wouldn't explain why this works, if both are simply generators: <pre><code>>>> x = (i for i in range(30)) >>> next(x) 0 </code></pre>

21,803,943

4

2

null

2014-02-15 21:24:21.68 UTC

8

2017-04-28 16:58:32.783 UTC

null

236,247

null

1,029,146

null

1

30

python|python-3.x|generator

15,277

<code>range</code> returns an iterable, not an iterator. It can make iterators when iteration is necessary. It is not a generator. A generator expression evaluates to an iterator (and hence an iterable as well).

2,162,061

Specify constructor for the Unity IoC container to use

I'm using the Unity IoC container for resolving my objects. However, I've run into an issue. When I have more than one constructor - how does Unity know which one to use? It seems to use the one with parameters when I have one with and one without. Can I explicitly tell it which constructor to use? Specifically I had a case similar to the following Person class with two constructors. In this case I want the IoC container to use the default constructor - without parameters - but it chooses the one with parameters. <pre><code>public class SomeValueObject { public SomeValueObject(string name) { Name = name; } public string Name { get; set; } } public class Person { private string _name; public Person() { _name = string.Empty; } public Person(SomeValueObject obj) { _name = obj.Name; } } </code></pre> This obviously fails as it can't create the SomeValueObject - not knowing what to inject to its string parameter. The error it gives is: <blockquote> Resolution of the dependency failed, type = "MyApp.Person", name = "". Exception message is: The current build operation (build key Build Key[MyApp.Person, null]) failed: The parameter obj could not be resolved when attempting to call constructor MyApp.Person(MyApp.SomeValueObject obj). (Strategy type BuildPlanStrategy, index 3) </blockquote> The container registration: <pre><code>Container.RegisterType<Person, Person>(new Microsoft.Practices.Unity.ContainerControlledLifetimeManager()); </code></pre> And the resolving: <pre><code>var person = Container.Resolve<Person>(); </code></pre>

2,162,119

4

3

null

2010-01-29 13:05:00.627 UTC

6

2010-03-25 16:54:55.913 UTC

null

25,300

null

100,894

null

1

44

c#|.net|unity-container|ioc-container

22,871

Register it like this instead: <pre><code>container.RegisterType<Person>(new InjectionConstructor()); </code></pre> You can add the LifetimeManager as well using an overload of the RegisterType method. That said, when modeling for DI, your life will be much easier if you have unambiguous contructors (i.e. no overloaded constructors).

1,756,825

How can I do a CPU cache flush in x86 Windows?

I am interested in forcing a CPU cache flush in Windows (for benchmarking reasons, I want to emulate starting with no data in CPU cache), preferably a basic C implementation or Win32 call. Is there a known way to do this with a system call or even something as sneaky as doing say a large <code>memcpy</code>? Intel i686 platform (P4 and up is okay as well).

1,757,198

4

0

null

2009-11-18 15:34:11.88 UTC

29

2021-11-21 20:07:37.86 UTC

2015-11-08 10:31:34.033 UTC

null

895,245

null

183,135

null

1

51

c|windows|x86|cpu|cpu-cache

37,565

Fortunately, there is more than one way to explicitly flush the caches. The instruction "wbinvd" writes back modified cache content and marks the caches empty. It executes a bus cycle to make external caches flush their data. Unfortunately, it is a privileged instruction. But if it is possible to run the test program under something like DOS, this is the way to go. This has the advantage of keeping the cache footprint of the "OS" very small. Additionally, there is the "invd" instruction, which invalidates caches without flushing them back to main memory. This violates the coherency of main memory and cache, so you have to take care of that by yourself. Not really recommended. For benchmarking purposes, the simplest solution is probably copying a large memory block to a region marked with WC (write combining) instead of WB. The memory mapped region of the graphics card is a good candidate, or you can mark a region as WC by yourself via the MTRR registers. You can find some resources about benchmarking short routines at <a href="http://www.agner.org/optimize/" rel="noreferrer">Test programs for measuring clock cycles and performance monitoring.</a>

2,211,030

failing to compile a project, missing io.h file

I fail to compile a C++ project for mobile device with Windows Mobile (Windows CE-based) operating system and Visual C++ compiler from Visual Studio fails with: <pre><code>Error 1 fatal error C1083: Cannot open include file: 'io.h' </code></pre> EDIT I am trying to compile the SQLite amalgamation, the shell.c file includes the call to this io.h but the io.h is missing from the files. I googled and I couldn't locate how can I get this .h file. Can someone point me in the right direction?

2,211,614

5

6

null

2010-02-05 22:55:12.327 UTC

0

2014-04-28 14:39:05.187 UTC

2010-02-06 01:35:54.28 UTC

null

151,641

null

243,782

null

1

5

c++|compiler-construction|compact-framework|include

40,551

The <code>io.h</code> file is not available in SDKs for Windows CE-based systems like Windows Mobile. In fact, <code>io.h</code> header has never been a part of ISO C nor C++ standards. It defines features that belongs <a href="http://en.wikipedia.org/wiki/Microsoft_POSIX_subsystem" rel="noreferrer">POSIX compatibility layer</a> on Windows NT, but not <a href="http://en.wikipedia.org/wiki/Microsoft_Windows_CE" rel="noreferrer">Windows CE</a>. Due to lack of POSIX features on Windows CE, I developed a small utility library <a href="http://wcelibcex.sourceforge.net/" rel="noreferrer">WCELIBCEX</a>. <a href="http://wcelibcex.svn.sourceforge.net/viewvc/wcelibcex/trunk/src/wce_io.h?revision=62&view=markup" rel="noreferrer">It does include io.h</a> but a very minimal version and which is likely insufficient for SQLite. However, as ctacke mentioned, you should use <a href="http://sqlite-wince.sourceforge.net/" rel="noreferrer">SQLite port for Windows CE</a> because original version of SQLite is not compilable for this platform. p.s. Note, Your question does not specify explicitly that you're building for Windows Mobile. If one doesn't spot the .NET Compact Framework mentioned in tags, then the whole question is ambiguous.

52,640,271

Why is String.prototype.substr() deprecated?

It is mentioned on the ECMAScript standard <a href="https://www.ecma-international.org/ecma-262/9.0/index.html#sec-additional-ecmascript-features-for-web-browsers" rel="noreferrer">here</a> that : <blockquote> ... These features are not considered part of the core ECMAScript language. Programmers should not use or assume the existence of these features and behaviours when writing new ECMAScript code. ECMAScript implementations are discouraged from implementing these features unless the implementation is part of a web browser or is required to run the same legacy ECMAScript code that web browsers encounter. </blockquote> There is also a red warning on MDN : <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr" rel="noreferrer">String.prototype.substr() MDN doc</a> Does anyone know why (ECMAScript standard say that) programmers should not use or assume the existence of <code>String.prototype.substr</code> ?

52,640,366

3

5

null

2018-10-04 06:21:52.44 UTC

5

2022-03-29 08:52:11.043 UTC

null

123,671

null

3,614,478

null

1

89

javascript|standards|ecma

52,184

Because it's never been part of the standardized language. It wasn't in the ECMAScript 1 or 2 specs at all, and only appears in ECMAScript 3 in Section B.2 ("Additional Properties") (and subsequent editions in similar annexes through to <a href="https://tc39.es/ecma262/#sec-string.prototype.substr" rel="noreferrer">today</a> [ES2022 draft as of this writing]), which said:¹ <blockquote> Some implementations of ECMAScript have included additional properties for some of the standard native objects. This non-normative annex suggests uniform semantics for such properties without making the properties or their semantics part of this standard. </blockquote> Moreover, <code>substr</code> is largely redundant with <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substring" rel="noreferrer"><code>substring</code></a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice" rel="noreferrer"><code>slice</code></a>, but the second argument has a different meaning,. In pragmatic terms, I'd be surprised if you found a full mainstream JavaScript engine that didn't provide it; but I wouldn't be surprised if JavaScript engines targeted at embedded/constrained environments use didn't provide it. <hr /> ¹ That wording has changed more recently to: <blockquote> The ECMAScript language syntax and semantics defined in this annex are required when the ECMAScript host is a web browser. The content of this annex is normative but optional if the ECMAScript host is not a web browser. <hr /> NOTE This annex describes various legacy features and other characteristics of web browser ECMAScript hosts. All of the language features and behaviours specified in this annex have one or more undesirable characteristics and in the absence of legacy usage would be removed from this specification. However, the usage of these features by large numbers of existing web pages means that web browsers must continue to support them. The specifications in this annex define the requirements for interoperable implementations of these legacy features. These features are not considered part of the core ECMAScript language. Programmers should not use or assume the existence of these features and behaviours when writing new ECMAScript code. ECMAScript implementations are discouraged from implementing these features unless the implementation is part of a web browser or is required to run the same legacy ECMAScript code that web browsers encounter. <hr /> </blockquote>

28,689,524

Show Real Time, Date, Day of the Week in javascript or jquery

How to show real time, date, day in this format? <img src="https://i.stack.imgur.com/Cl6wx.jpg" alt="enter image description here"> The time should be actual (which runs the seconds count). Thanks guys!

28,691,832

3

2

null

2015-02-24 06:32:50.397 UTC

3

2015-02-24 09:12:28.95 UTC

null

4,235,233

null

1

8

javascript|jquery|date|time

38,549

To update time panel every second we should use <code>setInterval()</code> function. To format date the way you need the best approach is to use <code>moment.js</code> library. The code is shortened greatly: <pre><code>$(document).ready(function() { var interval = setInterval(function() { var momentNow = moment(); $('#date-part').html(momentNow.format('YYYY MMMM DD') + ' ' + momentNow.format('dddd') .substring(0,3).toUpperCase()); $('#time-part').html(momentNow.format('A hh:mm:ss')); }, 100); }); </code></pre> <a href="http://jsfiddle.net/ivangrs/zf80q3nh/">Here is working fiddle</a>

26,306,326

Swift apply .uppercaseString to only the first letter of a string

I am trying to make an autocorrect system, and when a user types a word with a capital letter, the autocorrect doesn't work. In order to fix this, I made a copy of the string typed, applied .lowercaseString, and then compared them. If the string is indeed mistyped, it should correct the word. However then the word that replaces the typed word is all lowercase. So I need to apply .uppercaseString to only the first letter. I originally thought I could use <pre><code>nameOfString[0] </code></pre> but this apparently does not work. How can I get the first letter of the string to uppercase, and then be able to print the full string with the first letter capitalized? Thanks for any help!

26,306,372

30

1

null

2014-10-10 19:03:39.52 UTC

47

2021-09-15 11:32:58.227 UTC

2019-02-19 02:45:55.167 UTC

null

2,303,865

null

1,672,545

null

1

269

ios|swift|string|ios8-extension

176,389

Including mutating and non mutating versions that are consistent with API guidelines. Swift 3: <pre><code>extension String { func capitalizingFirstLetter() -> String { let first = String(characters.prefix(1)).capitalized let other = String(characters.dropFirst()) return first + other } mutating func capitalizeFirstLetter() { self = self.capitalizingFirstLetter() } } </code></pre> Swift 4: <pre><code>extension String { func capitalizingFirstLetter() -> String { return prefix(1).uppercased() + self.lowercased().dropFirst() } mutating func capitalizeFirstLetter() { self = self.capitalizingFirstLetter() } } </code></pre>

7,223,530

How can I properly center a JPanel ( FIXED SIZE ) inside a JFrame?

Hi all! I'm trying to solve an -apparently- simple problem, but I cannot fix it. I'm working on a sample application with Java/Swing libraries; I have a JFrame and a JPanel. I just want to achieve the following objectives: <ol> <li>JPanel MUST be centered inside the JFrame.</li> <li>JPanel MUST have ALWAYS the size that is specified with setPreferredSize() method. It MUST NOT be resized under this size.</li> </ol> I tried by using a GridBagLayout: it's the ONLY way I can do it. See the sample below: <pre><code>/* file StackSample01.java */ import java.awt.*; import javax.swing.*; public class StackSample01 { public static void main(String [] args) { JFrame frame = new JFrame(); JPanel panel = new JPanel(); panel.setPreferredSize(new Dimension(100, 100)); panel.setBackground(Color.RED); frame.setLayout(new GridBagLayout()); frame.add(panel, new GridBagConstraints()); frame.setSize(new Dimension(200, 200)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } </code></pre> <a href="http://i1141.photobucket.com/albums/n589/IT00/Screenshot01.png">Here</a> a screenshot: I would not use a GridBagLayout to do a thing too simple. I tried a simplest solution, by using a Box, but this does not work: Sample code: <pre><code>/* file StackSample02.java */ import java.awt.*; import javax.swing.*; public class StackSample02 { public static void main(String [] args) { JFrame frame = new JFrame(); JPanel panel = new JPanel(); panel.setPreferredSize(new Dimension(100, 100)); panel.setBackground(Color.RED); // for debug panel.setAlignmentX(JComponent.CENTER_ALIGNMENT); // have no effect Box box = new Box(BoxLayout.Y_AXIS); box.add(Box.createVerticalGlue()); box.add(panel); box.add(Box.createVerticalGlue()); // causes a deformation frame.add(box); frame.setSize(new Dimension(200, 200)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } } </code></pre> <a href="http://i1141.photobucket.com/albums/n589/IT00/Screenshot02.png">Here</a> a screenshot, Any ideas? Thanks to all :-)

7,224,700

6

5

null

2011-08-28 20:00:29.05 UTC

8

2014-09-05 06:28:14.163 UTC

2011-08-28 20:36:46.817 UTC

null

702,048

null

871,766

null

1

17

java|swing|gridbaglayout

66,423

<a href="http://download.oracle.com/javase/tutorial/uiswing/layout/box.html" rel="noreferrer">BoxLayout</a> can pretty to hold your setXxxSize(), then just add <code>panel.setMaximumSize(new Dimension(100, 100));</code> and your output would be Removed by setMinimumSize(notice if Container has greater size as ... ) <img src="https://i.stack.imgur.com/Lry74.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/3F1kO.png" alt="enter image description here"> <img src="https://i.stack.imgur.com/cgdMn.png" alt="enter image description here"> <pre><code>import java.awt.*; import javax.swing.*; public class CustomComponent12 extends JFrame { private static final long serialVersionUID = 1L; public CustomComponent12() { Box box = new Box(BoxLayout.Y_AXIS); box.setAlignmentX(JComponent.CENTER_ALIGNMENT); box.add(Box.createVerticalGlue()); box.add(new CustomComponents12()); box.add(Box.createVerticalGlue()); add(box); pack(); setTitle("Custom Component Test / BoxLayout"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setMaximumSize(getMinimumSize()); setMinimumSize(getMinimumSize()); setPreferredSize(getPreferredSize()); setLocation(150, 150); setVisible(true); } public static void main(String[] args) { Runnable r = new Runnable() { @Override public void run() { CustomComponent12 main = new CustomComponent12(); } }; javax.swing.SwingUtilities.invokeLater(r); } } class CustomComponents12 extends JPanel { private static final long serialVersionUID = 1L; @Override public Dimension getMinimumSize() { return new Dimension(100, 100); } @Override public Dimension getMaximumSize() { return new Dimension(100, 100); } @Override public Dimension getPreferredSize() { return new Dimension(100, 100); } @Override public void paintComponent(Graphics g) { int margin = 10; Dimension dim = getSize(); super.paintComponent(g); g.setColor(Color.red); g.fillRect(margin, margin, dim.width - margin * 2, dim.height - margin * 2); } } </code></pre>

7,504,546

View-based NSTableView with rows that have dynamic heights

I have an application with a view-based <code>NSTableView</code> in it. Inside this table view, I have rows that have cells that have content consisting of a multi-row <code>NSTextField</code> with word-wrap enabled. Depending on the textual content of the <code>NSTextField</code>, the size of the rows needed to display the cell will vary. I know that I can implement the <code>NSTableViewDelegate</code> method -<code>tableView:heightOfRow:</code> to return the height, but the height will be determined based on the word wrapping used on the <code>NSTextField</code>. The word wrapping of the <code>NSTextField</code> is similarly based on how wide the <code>NSTextField</code> is… which is determined by the width of the <code>NSTableView</code>. Soooo… I guess my question is… what is a good design pattern for this? It seems like everything I try winds up being a convoluted mess. Since the TableView requires knowledge of the height of the cells to lay them out... and the <code>NSTextField</code> needs knowledge of it's layout to determine the word wrap… and the cell needs knowledge of the word wrap to determine it's height… it's a circular mess… and it's driving me insane. Suggestions? If it matters, the end result will also have editable <code>NSTextFields</code> that will resize to adjust to the text within them. I already have this working on the view level, but the tableview does not yet adjust the heights of the cells. I figure once I get the height issue worked out, I'll use the -<code>noteHeightOfRowsWithIndexesChanged</code> method to inform the table view the height changed… but it's still then going to ask the delegate for the height… hence, my quandry. Thanks in advance!

8,054,170

10

5

null

2011-09-21 18:10:12.633 UTC

79

2017-11-01 23:27:09.14 UTC

2016-05-15 12:36:13.043 UTC

null

846,275

null

705,569

null

1

91

objective-c|macos|cocoa|osx-lion

39,162

This is a chicken and the egg problem. The table needs to know the row height because that determines where a given view will lie. But you want a view to already be around so you can use it to figure out the row height. So, which comes first? The answer is to keep an extra <code>NSTableCellView</code> (or whatever view you are using as your "cell view") around just for measuring the height of the view. In the <code>tableView:heightOfRow:</code> delegate method, access your model for 'row' and set the <code>objectValue</code> on <code>NSTableCellView</code>. Then set the view's width to be your table's width, and (however you want to do it) figure out the required height for that view. Return that value. Don't call <code>noteHeightOfRowsWithIndexesChanged:</code> from in the delegate method <code>tableView:heightOfRow:</code> or <code>viewForTableColumn:row:</code> ! That is bad, and will cause mega-trouble. To dynamically update the height, then what you should do is respond to the text changing (via the target/action) and recalculate your computed height of that view. Now, don't dynamically change the <code>NSTableCellView</code>'s height (or whatever view you are using as your "cell view"). The table must control that view's frame, and you will be fighting the tableview if you try to set it. Instead, in your target/action for the text field where you computed the height, call <code>noteHeightOfRowsWithIndexesChanged:</code>, which will let the table resize that individual row. Assuming you have your autoresizing mask setup right on subviews (i.e.: subviews of the <code>NSTableCellView</code>), things should resize fine! If not, first work on the resizing mask of the subviews to get things right with variable row heights. Don't forget that <code>noteHeightOfRowsWithIndexesChanged:</code> animates by default. To make it not animate: <pre><code>[NSAnimationContext beginGrouping]; [[NSAnimationContext currentContext] setDuration:0]; [tableView noteHeightOfRowsWithIndexesChanged:indexSet]; [NSAnimationContext endGrouping]; </code></pre> PS: I respond more to questions posted on the Apple Dev Forums than stack overflow. PSS: I wrote the view based NSTableView

13,933,312

Is there any private api to monitor network traffic on iPhone?

I need to implement an app that monitors inbound/outbound connections by different apps on iPhone. my app is going to run in background using apple's background multitasking feature for voip and navigators. I can use private api as my client doesn't need this app on appstore. Thanks.

14,252,327

3

0

null

2012-12-18 12:43:44.977 UTC

9

2013-03-20 06:12:59.397 UTC

2012-12-18 12:48:35.09 UTC

null

106,435

null

999,277

null

1

8

objective-c|ios|cocoa-touch|iphone-privateapi

4,903

I got through this. I didn't need any private Api to get information of inbound/outbound active connections. Its just you need to know basic C programming and some patience. I wrote to apple dev forums regarding this,and got response as- <pre><code>From my perspective most of what I have to say about this issue is covered in the post referenced below. <https://devforums.apple.com/message/748272#748272>> The way to make progress on this is to: o grab the relevant headers from the Mac OS X SDK o look at the Darwin source for netstat to see how the pieces fit together WARNING: There are serious compatibility risks associated with shipping an app that uses this technique; it's fine to use this for debugging and so on, but I recommend against shipping code like this to end users. </code></pre> What I did step by step is - 1)downloaded <a href="http://opensource.apple.com/source/network_cmds/network_cmds-396.6/netstat.tproj/" rel="nofollow">code of netstat</a> from BSD opensource - 2)add this to your new iphone project. 3)see,some header files are not present in ios sdk so you need take it copied from opensource.apple.com and add those in your iphone sdk at relevant path under- <pre><code>/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/include </code></pre> My xcode version is 4.5.2. so this is path relevent to my xcode. you can have different path according to versions of xcodes.Anyway. and remember to add those headers in both iosSdk & iOSSimulatorSdk both so that code will work on device as well as on simulator. 4)you may find some minor errors in netstat code relating not finding definitions of some structures in header files.e.g " struct xunpcb64 " .dont wory. definitions are present there.you need to comment some "#if !TARGET_OS_EMBEDDED" #else in those header files so that ios sdk can reach in those if condition and access the definition.(need some try and error.be patient.) 5)finally you will be abe to compile your code.Cheers!!

14,043,886

Python 2,3 Convert Integer to "bytes" Cleanly

The shortest ways I have found are: <pre><code>n = 5 # Python 2. s = str(n) i = int(s) # Python 3. s = bytes(str(n), "ascii") i = int(s) </code></pre> I am particularly concerned with two factors: readability and portability. The second method, for Python 3, is ugly. However, I think it may be backwards compatible. Is there a shorter, cleaner way that I have missed? I currently make a lambda expression to fix it with a new function, but maybe that's unnecessary.

14,044,431

7

10

null

2012-12-26 17:22:27.857 UTC

6

2022-09-09 11:37:32.827 UTC

2019-08-05 16:14:15.323 UTC

null

4,304,503

null

688,624

null

1

40

python

136,979

Answer 1: To convert a string to a sequence of bytes in either Python 2 or Python 3, you use the string's <code>encode</code> method. If you don't supply an encoding parameter <code>'ascii'</code> is used, which will always be good enough for numeric digits. <pre><code>s = str(n).encode() </code></pre> <ul> <li>Python 2: <a href="http://ideone.com/Y05zVY" rel="noreferrer">http://ideone.com/Y05zVY</a></li> <li>Python 3: <a href="http://ideone.com/XqFyOj" rel="noreferrer">http://ideone.com/XqFyOj</a></li> </ul> In Python 2 <code>str(n)</code> already produces bytes; the <code>encode</code> will do a double conversion as this string is implicitly converted to Unicode and back again to bytes. It's unnecessary work, but it's harmless and is completely compatible with Python 3. <hr> Answer 2: Above is the answer to the question that was actually asked, which was to produce a string of ASCII bytes in human-readable form. But since people keep coming here trying to get the answer to a different question, I'll answer that question too. If you want to convert <code>10</code> to <code>b'10'</code> use the answer above, but if you want to convert <code>10</code> to <code>b'\x0a\x00\x00\x00'</code> then keep reading. The <a href="https://docs.python.org/3/library/struct.html" rel="noreferrer"><code>struct</code> module</a> was specifically provided for converting between various types and their binary representation as a sequence of bytes. The conversion from a type to bytes is done with <a href="https://docs.python.org/3/library/struct.html#struct.pack" rel="noreferrer"><code>struct.pack</code></a>. There's a format parameter <code>fmt</code> that determines which conversion it should perform. For a 4-byte integer, that would be <code>i</code> for signed numbers or <code>I</code> for unsigned numbers. For more possibilities see the <a href="https://docs.python.org/3/library/struct.html#format-characters" rel="noreferrer">format character table</a>, and see the <a href="https://docs.python.org/3/library/struct.html#byte-order-size-and-alignment" rel="noreferrer">byte order, size, and alignment table</a> for options when the output is more than a single byte. <pre><code>import struct s = struct.pack('<i', 5) # b'\x05\x00\x00\x00' </code></pre>

9,384,448

How many bytes does a string take? A char?

I'm doing a review of my first semester C++ class, and I think I missing something. How many bytes does a string take up? A char? The examples we were given are, some being character literals and some being strings: <code>'n', "n", '\n', "\n", "\\n", ""</code> I'm particularly confused by the usage of newlines in there.

9,384,476

10

1

null

2012-02-21 20:11:42.9 UTC

6

2022-07-18 14:21:50.233 UTC

2012-02-21 20:23:28.917 UTC

null

224,988

null

224,988

null

1

20

c++|string|character

92,046

<pre><code>#include <iostream> int main() { std::cout << sizeof 'n' << std::endl; // 1 std::cout << sizeof "n" << std::endl; // 2 std::cout << sizeof '\n' << std::endl; // 1 std::cout << sizeof "\n" << std::endl; // 2 std::cout << sizeof "\\n" << std::endl; // 3 std::cout << sizeof "" << std::endl; // 1 } </code></pre> <ul> <li>Single quotes indicate characters.</li> <li>Double quotes indicate C-style strings with an invisible <code>NUL</code> terminator.</li> </ul> <code>\n</code> (line break) is only a single char and so is <code>\\</code> (backslash). <code>\\n</code> is just a backslash followed by <code>n</code>.

32,964,884

Add child view controller to current view controller

I am trying to add a child view controller in code, to the current view controller from storyboard by using the next code: <pre><code>UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil]; LogInTutorialViewController *lvc = [[LogInTutorialViewController alloc] init]; lvc = (LogInTutorialViewController *)[storyboard instantiateViewControllerWithIdentifier:@"LogInTutorialViewControllerID"]; [self displayContentController:lvc]; - (void) displayContentController: (LogInTutorialViewController*) content; { //add as childViewController [self addChildViewController:content]; [content didMoveToParentViewController:self]; [content.view setFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]; [self.view addSubview:content.view]; } </code></pre> The view seem to be displaying on the simulator at least but in console I get a lot or error: <pre><code> <Error>: CGContextSaveGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. </code></pre> And also the same description but different error: CGContextSetLineWidth, CGContextSetLineJoin, CGContextSetLineCap, CGContextSetMiterLimit, CGContextSetFlatness, CGContextAddPath, CGContextDrawPath, CGContextRestoreGState all these error get logged twice. Does anyone know what I am doing wrong? also I read a few posts and in some it was suggested to alloc and init the view controller before passing the data, I also tried that without any luck.

32,965,097

5

2

null

2015-10-06 08:13:23.077 UTC

7

2020-04-29 08:32:55.273 UTC

null

2,812,726

null

1

21

ios|objective-c|uinavigationcontroller

55,026

didMoveToParentViewController must be the last.

19,353,255

How to put Google Maps V2 on a Fragment using ViewPager

I am trying to do a tab layout same in Play Store. I got to display the <a href="http://www.androidhive.info/2013/10/android-tab-layout-with-swipeable-views-1/" rel="noreferrer">tab layout using a fragments and viewpager from androidhive.</a> However, I can't implement <a href="http://wptrafficanalyzer.in/blog/driving-distance-and-travel-time-duration-between-two-locations-in-google-map-android-api-v2/" rel="noreferrer">google maps v2</a> on it. I searched the internet for hours already, but I can't find a tutorial on how to do it. Can some one please show me how?

19,354,359

13

2

null

2013-10-14 03:48:36.047 UTC

96

2021-11-25 20:10:45.823 UTC

2018-12-17 12:18:18.79 UTC

null

3,924,118

null

2,718,577

null

1

142

android|google-maps|android-fragments

263,732

By using this code we can setup MapView anywhere, inside any ViewPager or Fragment or Activity. In the latest update of Google for Maps, only MapView is supported for fragments. MapFragment & SupportMapFragment didn't work for me. Setting up the layout for showing the map in the file <code>location_fragment.xml</code>: <pre><code><?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <com.google.android.gms.maps.MapView android:id="@+id/mapView" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout> </code></pre> Now, we setup the Java class for showing the map in the file <code>MapViewFragment.java</code>: <pre><code>public class MapViewFragment extends Fragment { MapView mMapView; private GoogleMap googleMap; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.location_fragment, container, false); mMapView = (MapView) rootView.findViewById(R.id.mapView); mMapView.onCreate(savedInstanceState); mMapView.onResume(); // needed to get the map to display immediately try { MapsInitializer.initialize(getActivity().getApplicationContext()); } catch (Exception e) { e.printStackTrace(); } mMapView.getMapAsync(new OnMapReadyCallback() { @Override public void onMapReady(GoogleMap mMap) { googleMap = mMap; // For showing a move to my location button googleMap.setMyLocationEnabled(true); // For dropping a marker at a point on the Map LatLng sydney = new LatLng(-34, 151); googleMap.addMarker(new MarkerOptions().position(sydney).title("Marker Title").snippet("Marker Description")); // For zooming automatically to the location of the marker CameraPosition cameraPosition = new CameraPosition.Builder().target(sydney).zoom(12).build(); googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition)); } }); return rootView; } @Override public void onResume() { super.onResume(); mMapView.onResume(); } @Override public void onPause() { super.onPause(); mMapView.onPause(); } @Override public void onDestroy() { super.onDestroy(); mMapView.onDestroy(); } @Override public void onLowMemory() { super.onLowMemory(); mMapView.onLowMemory(); } } </code></pre> Finally you need to get the API Key for your app by registering your app at <a href="https://cloud.google.com/console" rel="nofollow noreferrer">Google Cloud Console</a>. Register your app as Native Android App.

19,304,574

Center/Set Zoom of Map to cover all visible Markers?

I am setting multiple markers on my map and I can set statically the zoom levels and the center but what I want is, to cover all the markers and zoom as much as possible having all markets visible Available methods are following <a href="https://developers.google.com/maps/documentation/javascript/reference#Map" rel="noreferrer"><code>setZoom(zoom:number)</code></a> and <a href="https://developers.google.com/maps/documentation/javascript/reference#Map" rel="noreferrer"><code>setCenter(latlng:LatLng)</code></a> Neither <code>setCenter</code> supports multiple location or Location array input nor <code>setZoom</code> does have this type of functionality <img src="https://i.stack.imgur.com/Bkqjl.jpg" alt="enter image description here">

19,304,625

4

2

null

2013-10-10 19:28:05.11 UTC

88

2019-12-08 18:09:56.743 UTC

2017-12-16 23:25:31.177 UTC

null

2,314,737

null

1,215,724

null

1

393

javascript|google-maps-api-3

207,928

You need to use the <code>fitBounds()</code> method. <pre><code>var markers = [];//some array var bounds = new google.maps.LatLngBounds(); for (var i = 0; i < markers.length; i++) { bounds.extend(markers[i]); } map.fitBounds(bounds); </code></pre> <hr> Documentation from <a href="https://developers.google.com/maps/documentation/javascript/reference/map#Map.fitBounds" rel="noreferrer">developers.google.com/maps/documentation/javascript</a>: <blockquote> <h2><code>fitBounds(bounds[, padding])</code></h2> Parameters: <pre><code>`bounds`: [`LatLngBounds`][1]|[`LatLngBoundsLiteral`][1] `padding` (optional): number|[`Padding`][1] </code></pre> Return Value: None Sets the viewport to contain the given bounds. Note: When the map is set to <code>display: none</code>, the <code>fitBounds</code> function reads the map's size as <code>0x0</code>, and therefore does not do anything. To change the viewport while the map is hidden, set the map to <code>visibility: hidden</code>, thereby ensuring the map div has an actual size. </blockquote>

34,286,407

Gradle: What is the difference between classpath and compile dependencies?

When adding dependencies to my project I am never sure what prefix I should give them, e.g. <code>"classpath"</code> or <code>"compile".</code> For example, should my dependencies below be compile time or classpath? Also, should this be in my applications build.gradle or in the module specific build.gradle? Current build.gradle (at application level): <pre><code>apply plugin: 'java' repositories { mavenCentral() } dependencies { compile 'org.hibernate:hibernate-core:5.0.5.Final' compile 'mysql:mysql-connector-java:5.1.38' } </code></pre>

34,295,609

4

null

2015-12-15 10:14:15.037 UTC

19

2021-10-19 13:26:13.723 UTC

2015-12-15 17:20:47.897 UTC

null

25,066

null

5,528,751

null

1

117

java|gradle|dependencies

94,906

I'm going to guess that you're referencing <code>compile</code> and <code>classpath</code> within the <code>dependencies {}</code> block. If that is so, those are dependency <a href="https://docs.gradle.org/current/userguide/artifact_dependencies_tutorial.html" rel="noreferrer">Configurations</a>. <blockquote> A configuration is simply a named set of dependencies. </blockquote> The <code>compile</code> configuration is created by the Java plugin. The <code>classpath</code> configuration is commonly seen in the <code>buildSrc {}</code> block where one needs to declare dependencies for the build.gradle, itself (for plugins, perhaps).

34,910,841

Difference between Collections.sort(list) and list.sort(Comparator)

Is there any reason why I should prefer <code>Collections.sort(list)</code> method over simply calling the <code>list.sort()</code>? Internally <code>Collections.sort</code> merely calls the <code>sort</code> method of the <code>List</code> class anyway. It's just surprising that almost everyone is telling me to use <code>Collections.sort</code>. Why?

34,910,953

3

4

null

2016-01-20 21:23:58.263 UTC

3

2021-02-12 14:58:22.527 UTC

null

1,439,733

null

5,539,357

null

1

54

java|list|sorting

15,873

The method <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html#sort-java.util.Comparator-" rel="noreferrer"><code>List.sort(comparator)</code></a> that you are refering to was introduced in Java 8, whereas the utility method <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#sort-java.util.List-" rel="noreferrer"><code>Collections.sort</code></a> has been there since Java 1.2. As such, you will find a lot of reference on the Internet mentioning that utility method but that's just because it has been in the JDK for a lot longer. Note that the change in implementation for <code>Collections.sort</code> <a href="https://stackoverflow.com/a/34827492/1743880">was made in 8u20</a>.

262,618

Java BufferedReader back to the top of a text file?

I currently have 2 <code>BufferedReader</code>s initialized on the same text file. When I'm done reading the text file with the first <code>BufferedReader</code>, I use the second one to make another pass through the file from the top. Multiple passes through the same file are necessary. I know about <code>reset()</code>, but it needs to be preceded with calling <code>mark()</code> and <code>mark()</code> needs to know the size of the file, something I don't think I should have to bother with. Ideas? Packages? Libs? Code? Thanks TJ

262,631

5

0

null

2008-11-04 17:31:43.11 UTC

4

2015-03-20 16:00:51.78 UTC

null

1,501,234

T to the J

null

1

26

java|file|file-io|text-files|bufferedinputstream

74,923

What's the disadvantage of just creating a new <code>BufferedReader</code> to read from the top? I'd expect the operating system to cache the file if it's small enough. If you're concerned about performance, have you proved it to be a bottleneck? I'd just do the simplest thing and not worry about it until you have a specific reason to. I mean, you could just read the whole thing into memory and then do the two passes on the result, but again that's going to be more complicated than just reading from the start again with a new reader.

557,574

What is a native implementation in Java?

If we look at the Java Object class then we can find some of the methods like: <pre><code>public native int hashCode() protected native Object clone() </code></pre> What are these natives and how do these methods work?

557,610

5

0

null

2009-02-17 16:13:40.223 UTC

13

2017-10-21 21:53:02.423 UTC

starblue

3,745,896

Dinesh Simkhada

13,240

null

1

35

java|java-native-interface

20,342

These methods are either Intrinsic or written outside Java in "native" code, that is, specific to the given machine. The ones you mention are Intrinsic and part of the JDK but you can also write native methods yourself using the <a href="http://java.sun.com/docs/books/jni/" rel="noreferrer">Java Native Interface</a> (JNI). This would normally use C to write the methods, but a lot of other languages, such as python allow you to write methods this way fairly easily. Code is written this way either for performance, or because it needs to access platform specific infrastructure which cannot be done in plain java. In the case of <code>hashcode()</code>, this is implemented by the JVM. This is because often the hashcode will be related to something only the JVM knows. On early JVMs this was related to the object's location in memory - on other JVMs the Object may move in memory, and so a more complicated (but still very fast) scheme may be used.

750,298

Easy way to check that a variable is defined in python?

Is there any way to check if a variable (class member or standalone) with specified name is defined? Example: <pre><code>if "myVar" in myObject.__dict__ : # not an easy way print myObject.myVar else print "not defined" </code></pre>

750,318

5

null

2009-04-15 04:21:17.717 UTC

17

2014-07-17 13:47:57.78 UTC

null

1,751,037

null

69,882

null

1

48

python

77,219

A compact way: <pre><code>print myObject.myVar if hasattr(myObject, 'myVar') else 'not defined' </code></pre> htw's way is more Pythonic, though. <code>hasattr()</code> is different from <code>x in y.__dict__</code>, though: <code>hasattr()</code> takes inherited class attributes into account, as well as dynamic ones returned from <code>__getattr__</code>, whereas <code>y.__dict__</code> only contains those objects that are attributes of the <code>y</code> instance.

197,190

Why can't I use a type argument in a type parameter with multiple bounds?

So, I understand that the following doesn't work, but why doesn't it work? <pre><code>interface Adapter<E> {} class Adaptulator { <E, A extends I & Adapter<E>> void add(Class<E> extl, Class<A> intl) { addAdapterFactory(new AdapterFactory<E, A>(extl, intl)); } } </code></pre> The <code>add()</code> method gives me a compile error, "Cannot specify any additional bound Adapter<E> when first bound is a type parameter" (in Eclipse), or "Type parameter cannot be followed by other bounds" (in IDEA), take your pick. Clearly you're just Not Allowed to use the type parameter <code>I</code> there, before the <code>&</code>, and that's that. (And before you ask, it doesn't work if you switch 'em, because there's no guarantee that <code>I</code> isn't a concrete class.) But why not? I've looked through Angelika Langer's FAQ and can't find an answer. Generally when some generics limitation seems arbitrary, it's because you've created a situation where the type system can't actually enforce correctness. But I don't see what case would break what I'm trying to do here. I'd say maybe it has something to do with method dispatch after type erasure, but there's only one <code>add()</code> method, so it's not like there's any ambiguity... Can someone demonstrate the problem for me?

197,391

5

0

null

2008-10-13 10:21:58.29 UTC

14

2020-12-09 14:39:22.567 UTC

2014-09-29 09:47:43.277 UTC

mark

474,189

David Moles

27,358

null

1

59

java|generics|constraints

15,971

I'm also not sure why the restriction is there. You could try sending a friendly e-mail to the designers of Java 5 Generics (chiefly Gilad Bracha and Neal Gafter). My guess is that they wanted to support only an absolute minimum of <a href="https://docs.oracle.com/javase/specs/jls/se8/html/jls-4.html#jls-4.9" rel="noreferrer">intersection types</a> (which is what multiple bounds essentially are), to make the language no more complex than needed. An intersection cannot be used as a type annotation; a programmer can only express an intersection when it appears as the upper bound of a type variable. And why was this case even supported? The answer is that multiple bounds allow you to control the erasure, which allows to maintain binary compatibility when generifying existing classes. As explained in section 17.4 of the <a href="http://java-generics-book.dev.java.net/" rel="noreferrer">book</a> by Naftalin and Wadler, a <code>max</code> method would logically have the following signature: <pre><code>public static <T extends Comparable<? super T>> T max(Collection<? extends T> coll) </code></pre> However, this erases to: <pre><code>public static Comparable max(Collection coll) </code></pre> Which does not match the historical signature of <code>max</code>, and causes old clients to break. With multiple bounds, only the left-most bound is considered for the erasure, so if <code>max</code> is given the following signature: <pre><code>public static <T extends Object & Comparable<? super T>> T max(Collection<? extends T> coll) </code></pre> Then the erasure of its signature becomes: <pre><code>public static Object max(Collection coll) </code></pre> Which is equal to the signature of <code>max</code> before Generics. It seems plausible that the Java designers only cared about this simple case and restricted other (more advanced) uses of intersection types because they were just unsure of the complexity that it might bring. So the reason for this design decision does not need to be a possible safety problem (as the question suggests). More discussion on intersection types and restrictions of generics in an <a href="http://www.cs.rice.edu/~javaplt/papers/oopsla2008.pdf" rel="noreferrer">upcoming OOPSLA paper</a>.

1,115,230

casting Object array to Integer array error

What's wrong with the following code? <pre><code>Object[] a = new Object[1]; Integer b=1; a[0]=b; Integer[] c = (Integer[]) a; </code></pre> The code has the following error at the last line : <blockquote> Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer; </blockquote>

8,220,245

5

0

null

2009-07-12 03:14:18.007 UTC

29

2018-03-06 07:24:11.273 UTC

2017-05-29 14:19:07.963 UTC

null

833,070

null

65,167

null

1

77

java|casting

141,962

Ross, you can use Arrays.copyof() or Arrays.copyOfRange() too. <pre><code>Integer[] integerArray = Arrays.copyOf(a, a.length, Integer[].class); Integer[] integerArray = Arrays.copyOfRange(a, 0, a.length, Integer[].class); </code></pre> Here the reason to hitting an <code>ClassCastException</code> is you can't treat an array of <code>Integer</code> as an array of <code>Object</code>. <code>Integer[]</code> is a subtype of <code>Object[]</code> but <code>Object[]</code> is not a <code>Integer[]</code>. And the following also will not give an <code>ClassCastException</code>. <pre><code>Object[] a = new Integer[1]; Integer b=1; a[0]=b; Integer[] c = (Integer[]) a; </code></pre>

1,166,444

MKMapView Zoom and Region

I'm familiar with using Google Maps Javascript API. Recently I started using MapKit framework for an iphone project, but I'm having a hard time to figure out zooming and setting a region on map. In Google Maps API I used to use integer zoom levels like 8, 9, 10 along with straightforward function setZoom(). The only equivalent method I can see in the MapKit framework is setRegion:animated. As I understand, I need to set a region's span's latitude and longitude "delta" values to specify zoom level. But I really don't have an idea what these values represent(I read the documentation). When I use a MKMapView delegate and trace the span values in regionDidChange delegate method results don't seem to correlate each other. It's ok when I zoom out and see the span delta values are increasing as specified in documentation. But suddenly I drag the map without zooming and delta values become 0.0. Can somebody please explain what is the reference point to these span and delta? Or is there any algorithm to convert an integer zoom level(like 9) to these delta values? As a bonus question is there any way to specify a minimum-maximum zoom level on a MKMapView :) Thanks

1,167,696

5

0

null

2009-07-22 16:16:58.52 UTC

59

2016-07-01 14:40:08.067 UTC

2012-01-24 14:39:36.82 UTC

user353955

null

133,617

null

1

86

iphone|cocoa-touch|mapkit|zooming

80,649

First of all, MKMapView does not use/have a predefined set of zoom levels like Google Maps does. Instead, the visible area of a MKMapView is described using MKCoordinateRegion, which consists of two values: <ol> <li>center (the center point of the region), and</li> <li>span (the size of the visible area around center).</li> </ol> The center point should be obvious (it's the center point of the region.) However, span (which is a MKCoordinateSpan) consists of: <ol> <li>latitudeDelta (the vertical distance represented by the region), and</li> <li>longitudeDelta (the horizontal distance represented by the region).</li> </ol> A brief example. Here's a toy MKCoordinateRegion: <ol> <li>center: <ul> <li>latitude: 0</li> <li>longitude: 0</li> </ul></li> <li>span: <ul> <li>latitudeDelta: 8</li> <li>longitudeDelta: 6</li> </ul></li> </ol> The region could be described using its min and max coordinates as follows: <ol> <li>min coordinate (lower left-hand point): <ul> <li>latitude: -4</li> <li>longitude: -3</li> </ul></li> <li>max coordinate (upper right-hand point): <ul> <li>latitude: 4</li> <li>longitude: 3</li> </ul></li> </ol> So, you can specify zoom levels around a center point by using an appropriately sized MKCoordinateSpan. As an approximation of Google's numeric zoom levels, you could reverse engineer the span sizes that Google uses for a given zoom level and create a span, accordingly. (Google describes their view regions in the same way that MKMapView does, as a center + span, so you can pull these values out of Google Maps.) As for restricting the region, you may play w/ this delegate method: <pre><code>mapView:regionWillChangeAnimated </code></pre> e.g. by resizing the region back into your allowed zoom levels. (Kind of like how table views will let you scroll past the edge, but will then rubber band back into place.) However, your mileage may vary, since I haven't used it for this purpose. btw, there are definite fixes/improvements in OS 3.1 to aspects of MapKit that were giving me trouble in 3.0.

1,221,322

How does semaphore work?

Can the semaphore be lower than 0? I mean, say I have a semaphore with N=3 and I call "down" 4 times, then N will remain 0 but one process will be blocked? And same the other way, if in the beginning I call up, can N be higher than 3? Because as I see it, if N can be higher than 3 if in the beginning I call up couple of times, then later on I could call down more times than I can, thus putting more processes in the critical section then the semaphore allows me. If someone would clarify it a bit for me I will much appreciate. Greg

1,221,387

6

1

null

2009-08-03 09:02:19.673 UTC

6

2019-01-30 15:13:55.183 UTC

2012-10-09 09:10:54.047 UTC

null

1,528,262

Greg

null

1

14

java|multithreading|computer-science|semaphore

39,627

Calling down when it's 0 should not work. Calling up when it's 3 does work. (I am thinking of Java). Let me add some more. Many people think of locks like (binary) semaphores (ie - N = 1, so the value of the semaphore is either 0 (held) or 1 (not held)). But this is not quite right. A lock has a notion of "ownership" so it may be "reentrant". That means that a thread that holds a lock, is allowed to call lock() again (effectively moving the count from 0 to -1), because the thread already holds the lock and is allowed to "reenter" it. Locks can also be non reentrant. A lock holder is expected to call unlock() the same number of times as lock(). Semaphores have no notion of ownership, so they cannot be reentrant, although as many permits as are available may be acquired. That means a thread needs to block when it encounters a value of 0, until someone increments the semaphore. Also, in what I have seen (which is Java), you can increment the semaphore greater than N, and that also sort of has to do with ownership: a Semaphore has no notion of ownership so anybody can give it more permits. Unlike a thread, where whenever a thread calls unlock() without holding a lock, that is an error. (In java it will throw an exception). Hope this way of thinking about it helps.

659,463

What's causing xcopy to tell me Access Denied?

The postbuild task for one of our solutions uses xcopy to move files into a common directory for build artifacts. For some reason, on my computer (and on a VM I tested), the xcopy fails with "Access Denied". Here's what I've done to try and isolate the problems: <ul> <li>I tried a normal copy; this works.</li> <li>I double-checked that none of the files in question were read-only.</li> <li>I checked the permissions on both the source and destination folder; I have full control of both.</li> <li>I tried calling the xcopy from the command line in case the VS build process had locked the file.</li> <li>I used Unlocker and Process Explorer to determine there were no locks on the source file.</li> </ul> What have I missed, other than paranoid conspiracy theories involving computers out to get me? This happens on my dev machine and a clean VM, but doesn't happen for anyone else on the project.

659,837

6

2

null

2009-03-18 18:07:11.543 UTC

3

2018-11-02 06:44:25.52 UTC

Adam Lassek

3,826,372

OwenP

2,547

null

1

21

windows|cmd|xcopy

97,131

Problem solved; there's two pieces to the puzzle. The /O switch requires elevation on Vista. Also, I noticed that xcopy is deprecated in Vista in favor of robocopy. Now I'm talking with our build engineers about this.

1,072,311

Code Sign error: The identity 'iPhone Developer: x Xxxxx' doesn't match any identity in any profile

I get this build error when I build my iPhone project to run on my device: <pre><code> **Code Sign error: The identity 'iPhone Developer: x Xxxxx' doesn't match any identity in any profile** </code></pre> My development code signing certificate expired so I got a new one. On my first attempt I created a new CSR and got the message above. The second time I reused my original CSR and got the same result. Another strange thing is the new certificate has an extra string with brackets after my name in the "common name" when I look at it using Keychain Access like this: <pre><code>iPhone Developer: x Xxxxx **(3BDUAJYC9Q)** </code></pre> `My original certificate didn't have that. <pre><code>I have Xcode Version 3.1.3 Component versions Xcode IDE: 1191.0 Xcode Core: 1192.0 ToolSupport: 1186.0 </code></pre> Does anyone know how to solve this?

1,072,343

6

1

null

2009-07-02 03:25:45.393 UTC

13

2013-05-10 13:49:36.727 UTC

2011-12-28 12:21:30.077 UTC

null

1,099,169

null

87,507

null

1

33

iphone|iphone-sdk-3.0|certificate|code-signing

81,377

I think you need to create new provisioning profiles based on your new certificate. Log on to developer.apple.com and go to the iOS Provisioning Portal -> Provisioning -> Development. Most likely, the profile you once created has expired, so just renew and redownload it.

628,343

Objective C Boolean Array

I need to utilize an array of booleans in objective-c. I've got it mostly set up, but the compiler throws a warning at the following statement: <pre><code>[updated_users replaceObjectAtIndex:index withObject:YES]; </code></pre> This is, I'm sure, because YES is simply not an object; it's a primitive. Regardless, I need to do this, and would greatly appreciate advice on how to accomplish it. Thanks.

628,359

6

1

null

2009-03-09 22:52:46.527 UTC

7

2015-01-30 20:53:11.783 UTC

null

Allyn

57,414

null

1

39

c|objective-c|arrays|boolean|primitive

41,935

Yep, that's exactly what it is: the NS* containers can only store objective-C objects, not primitive types. You should be able to accomplish what you want by wrapping it up in an NSNumber: <code>[updated_users replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:YES]]</code> or by using <code>@(YES)</code> which wraps a <code>BOOL</code> in an <code>NSNumber</code> <code>[updated_users replaceObjectAtIndex:index withObject:@(YES)]]</code> You can then pull out the boolValue: <code>BOOL mine = [[updated_users objectAtIndex:index] boolValue];</code>

1,232,953

Speed up File.Exists for non existing network shares

I have to check if a set of file paths represent an existing file. It works fine except when the path contains a network share on a machine that's not on the current network. In this case it takes a pretty long time (30 or 60 seconds) to timeout. Questions <ul> <li>Is there a way to shorten the timeout for non existing network shares? (I'm certain that when they do exist they'll answer quickly, so a timeout of 1 sec would be fine)</li> <li>Is there any other way to solve this issue without starting to cache and making the algorithm more complex? (ie, I already know these X network shares don't exist, skip the rest of the matching paths)</li> </ul> UPDATE: Using Threads work, not particularly elegant, though <pre><code>public bool pathExists(string path) { bool exists = true; Thread t = new Thread ( new ThreadStart(delegate () { exists = System.IO.File.Exists(path); }) ); t.Start(); bool completed = t.Join(500); //half a sec of timeout if (!completed) { exists = false; t.Abort(); } return exists; } </code></pre> This solution avoids the need for a thread per attempt, first check which drives are reachable and store that somewhere. <hr> <h2><a href="http://www.experts-exchange.com/Programming/Languages/.NET/Visual_Basic.NET/Q_22595703.html" rel="noreferrer">Experts exchange solution</a>:</h2> <blockquote> First of all, there is a "timeout" value that you can set in the IsDriveReady function. I have it set for 5 seconds, but set it for whatever works for you. 3 methods are used below: <ol> <li>The first is the WNetGetConnection API function that gets the UNC (\servername\share) of the drive</li> <li>The second is our main method: The Button1_Click event</li> <li>The third is the IsDriveReady function that pings the server.</li> </ol> This worked great for me! Here you go: <pre><code>'This API Function will be used to get the UNC of the drive Private Declare Function WNetGetConnection Lib "mpr.dll" Alias _ "WNetGetConnectionA" _ (ByVal lpszLocalName As String, _ ByVal lpszRemoteName As String, _ ByRef cbRemoteName As Int32) As Int32 'This is just a button click event - add code to your appropriate event Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim bIsReady As Boolean = False For Each dri As IO.DriveInfo In IO.DriveInfo.GetDrives() 'If the drive is a Network drive only, then ping it to see if it's ready. If dri.DriveType = IO.DriveType.Network Then 'Get the UNC (\\servername\share) for the ' drive letter returned by dri.Name Dim UNC As String = Space(100) WNetGetConnection(dri.Name.Substring(0, 2), UNC, 100) 'Presuming the drive is mapped \\servername\share ' Parse the servername out of the UNC Dim server As String = _ UNC.Trim().Substring(2, UNC.Trim().IndexOf("\", 2) - 2) 'Ping the server to see if it is available bIsReady = IsDriveReady(server) Else bIsReady = dri.IsReady End If 'Only process drives that are ready If bIsReady = True Then 'Process your drive... MsgBox(dri.Name & " is ready: " & bIsReady) End If Next MsgBox("All drives processed") End Sub Private Function IsDriveReady(ByVal serverName As String) As Boolean Dim bReturnStatus As Boolean = False '*** SET YOUR TIMEOUT HERE *** Dim timeout As Integer = 5 '5 seconds Dim pingSender As New System.Net.NetworkInformation.Ping() Dim options As New System.Net.NetworkInformation.PingOptions() options.DontFragment = True 'Enter a valid ip address Dim ipAddressOrHostName As String = serverName Dim data As String = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Dim buffer As Byte() = System.Text.Encoding.ASCII.GetBytes(data) Dim reply As System.Net.NetworkInformation.PingReply = _ pingSender.Send(ipAddressOrHostName, timeout, buffer, options) If reply.Status = Net.NetworkInformation.IPStatus.Success Then bReturnStatus = True End If Return bReturnStatus End Function </code></pre> </blockquote>

1,233,089

6

null

2009-08-05 12:30:15.607 UTC

8

2018-10-05 11:15:02.183 UTC

2015-08-14 14:52:13.083 UTC

null

1,364,007

null

5,190

null

1

39

c#|networking|timeout|c#-2.0

23,033

Use Threads to do the checks. I think that threads can be timed out.

1,072,097

Pointers to some good SVM Tutorial

I have been trying to grasp the basics of Support Vector Machines, and downloaded and read many online articles. But still am not able to grasp it. I would like to know, if there are some <ul> <li>nice tutorial</li> <li>sample code which can be used for understanding</li> </ul> or something, that you can think of, and that will enable me to learn SVM Basics easily. PS: I somehow managed to learn PCA (Principal Component Analysis). BTW, you guys would have guessed that I am working on Machine Learning.

1,072,973

6

3

null

2009-07-02 02:10:37.307 UTC

41

2018-01-08 01:33:40.387 UTC

2009-11-18 06:55:47.007 UTC

null

25,891

null

70,702

null

1

48

algorithm|machine-learning|svm|libsvm

20,259

The standard recommendation for a tutorial in SVMs is <a href="http://research.microsoft.com/pubs/67119/svmtutorial.pdf" rel="noreferrer">A Tutorial on Support Vector Machines for Pattern Recognition</a> by Christopher Burges. Another good place to learn about SVMs is the <a href="http://see.stanford.edu/see/courseInfo.aspx?coll=348ca38a-3a6d-4052-937d-cb017338d7b1" rel="noreferrer">Machine Learning Course</a> at Stanford (SVMs are covered in lectures 6-8). Both these are quite theoretical and heavy on the maths. As for source code; <a href="http://svmlight.joachims.org/" rel="noreferrer">SVMLight</a>, <a href="http://www.csie.ntu.edu.tw/~cjlin/libsvm/" rel="noreferrer">libsvm</a> and <a href="http://chasen.org/~taku/software/TinySVM/" rel="noreferrer">TinySVM</a> are all open-source, but the code is not very easy to follow. I haven't looked at each of them very closely, but the source for TinySVM is probably the is easiest to understand. There is also a pseudo-code implementation of the SMO algorithm in <a href="http://research.microsoft.com/apps/pubs/?id=68391" rel="noreferrer">this paper</a>.

649,106

MSTest copy file to test run folder

I've got a test which requires an XML file to be read in and then parsed. How can I have this file copied into the test run folder each time? The XML file is set to "Copy if newer" and a compile mode of "none" (since it's not really a compile-able thing)

649,449

6

0

null

2009-03-16 02:49:20.383 UTC

19

2014-01-07 10:37:29.683 UTC

2009-04-06 17:11:03.987 UTC

Slace

685

Slace

11,388

null

1

112

visual-studio|mstest

39,243

use a <a href="http://msdn.microsoft.com/en-us/library/microsoft.visualstudio.testtools.unittesting.deploymentitemattribute(VS.80).aspx" rel="noreferrer"><code>DeploymentItem</code> attribute</a> <pre><code>using System; using System.IO; using Microsoft.VisualStudio.TestTools.UnitTesting; using CarMaker; namespace DeploymentTest { [TestClass] public class UnitTest1 { [TestMethod()] [DeploymentItem("testFile1.xml")] public void ConstructorTest() { string file = "testFile1.xml"; Assert.IsTrue(File.Exists(file), "deployment failed: " + file + " did not get deployed"); } } } </code></pre>

37,634,483

Default Docker entrypoint

I am creating an image from another image that set a specific entrypoint. However I want my image to have default one. How do I reset the ENTRYPOINT? I tried the following Dockerfile: <pre><code>FROM some-image ENTRYPOINT ["/bin/sh", "-c"] </code></pre> Unfortunately it doesn't work like the default entrypoint as it need the command to be quoted. <pre><code>docker run myimage ls -l / # "-l /" arguments are ignored file1 file2 file3 # files in current working directory docker run myimage "ls -l /" # works correctly </code></pre> How do I use commands without quoting?

37,636,548

3

2

null

2016-06-04 20:00:14.75 UTC

5

2021-11-10 00:22:35.857 UTC

null

2,582,797

null

1

38

docker|sh

27,897

To disable an existing <code>ENTRYPOINT</code>, set an empty array in your docker file <pre><code>ENTRYPOINT [] </code></pre> Then your arguments to <code>docker run</code> will exec as a <a href="https://docs.docker.com/engine/reference/builder/#cmd" rel="noreferrer">shell form CMD</a> would normally. The reason your <code>ENTRYPOINT ["/bin/sh", "-c"]</code> requires quoted strings is that without the quotes, the arguments to <code>ls</code> are being passed to <code>sh</code> instead. Unquoted results in lots of arguments being sent to <code>sh</code> <pre><code>"/bin/sh", "-c", "ls", "-l", "/" </code></pre> Quoting allows the complete command (<code>sh -c</code>) to be passed on to <code>sh</code> as one argument. <pre><code>"/bin/sh", "-c", "ls -l /" </code></pre>

21,036,744

Set asp.net textbox value using javascript

I want to set the value of a asp.net textbox using javascript My JS Code is: <pre><code>document.getElementById('<%=txtFlag.ClientID %>').value = "Track"; </code></pre> My textbox is: <pre><code><asp:TextBox ID="txtFlag" runat="server" Visible="False"></asp:TextBox> </code></pre> But it gives me an error <code>document.getElementById(...)' is null or not an object</code> I dont understand what is wrong. Please help.

21,036,965

5

4

null

2014-01-10 05:24:22.77 UTC

2

2014-01-10 05:48:36.843 UTC

2014-01-10 05:27:36.487 UTC

null

2,231,046

null

2,124,167

null

1

6

javascript|asp.net

67,129

Solution 1: Make that textbox as visible=true and try, When you make a control as visible false, that control will not be loaded in client side and as you knew javascript will be executed on client side itself. Solution 2: Add this javascript at the end of the page.

21,002,616

How to disable a <option> of select element when using AngularJS ng-options?

Is there a way to disable an <code>option</code> in a <code>select</code> element when we populate <code>options</code> with ng-options in AngularJS? Like this: <a href="http://www.w3schools.com/tags/att_option_disabled.asp" rel="noreferrer">http://www.w3schools.com/tags/att_option_disabled.asp</a> You can do it by adding <code>ng-disabled</code> to each <code><option></code> tag, but is there a way to do it if we are using the <code>ng-options</code> directive in the <code>select</code> tag?

21,003,743

5

6

null

2014-01-08 17:35:04.857 UTC

1

2016-06-19 08:27:52.3 UTC

2016-06-19 08:01:58.277 UTC

null

4,015,856

null

3,099,273

null

1

10

angularjs|angularjs-directive|ng-options

63,240

One way to do this is, to forget using <code>ng-options</code> on the <code>select</code> element, and add the options in with <code>ng-repeat</code>, then you can add a <code>ng-disabled</code> check on each <code>option</code>. <a href="http://jsfiddle.net/97LP2/" rel="noreferrer">http://jsfiddle.net/97LP2/</a> <pre><code><div ng-app="myapp"> <form ng-controller="ctrl"> <select id="t1" ng-model="curval"> <option ng-repeat="i in options" value="{{i}}" ng-disabled="disabled[i]">{{i}}</option> </select> <button ng-click="disabled[curval]=true">disable</button> </form> </div> </code></pre> a minimal controller for testing: <pre><code>angular.module('myapp',[]).controller("ctrl", function($scope){ $scope.options=['test1','test2','test3','test4','test5']; $scope.disabled={}; }) </code></pre>

17,819,884

XML (.xsd) feed validation against a schema

I have a XML file and I have a XML schema. I want to validate the file against that schema and check if it adheres to that. I am using python but am open to any language for that matter if there is no such useful library in python. What would be my best options here? I would worry about the how fast I can get this up and running.

17,819,981

3

0

null

2013-07-23 19:58:26.54 UTC

11

2021-06-23 07:36:22.44 UTC

null

2,487,334

null

1

18

python|xml|python-2.7|xsd|xml-validation

17,749

Definitely <a href="http://lxml.de/" rel="nofollow noreferrer"><code>lxml</code></a>. Define an <a href="http://lxml.de/api/index.html" rel="nofollow noreferrer"><code>XMLParser</code></a> with a predefined schema, load the the file <code>fromstring()</code> and catch any XML Schema errors: <pre><code>from lxml import etree def validate(xmlparser, xmlfilename): try: with open(xmlfilename, 'r') as f: etree.fromstring(f.read(), xmlparser) return True except etree.XMLSchemaError: return False schema_file = 'schema.xsd' with open(schema_file, 'r') as f: schema_root = etree.XML(f.read()) schema = etree.XMLSchema(schema_root) xmlparser = etree.XMLParser(schema=schema) filenames = ['input1.xml', 'input2.xml', 'input3.xml'] for filename in filenames: if validate(xmlparser, filename): print("%s validates" % filename) else: print("%s doesn't validate" % filename) </code></pre> <h2>Note about encoding</h2> If the schema file contains an xml tag with an encoding (e.g. <code><?xml version="1.0" encoding="UTF-8"?></code>), the code above will generate the following error: <pre><code>Traceback (most recent call last): File "<input>", line 2, in <module> schema_root = etree.XML(f.read()) File "src/lxml/etree.pyx", line 3192, in lxml.etree.XML File "src/lxml/parser.pxi", line 1872, in lxml.etree._parseMemoryDocument ValueError: Unicode strings with encoding declaration are not supported. Please use bytes input or XML fragments without declaration. </code></pre> <a href="https://stackoverflow.com/questions/28534460/lxml-etree-xml-valueerror-for-unicode-string">A solution</a> is to open the files in byte mode: <code>open(..., 'rb')</code> <pre><code>[...] def validate(xmlparser, xmlfilename): try: with open(xmlfilename, 'rb') as f: [...] with open(schema_file, 'rb') as f: [...] </code></pre>

18,139,910

Internal Server Error when using Flask session

I want to save an ID between requests, using Flask <code>session</code> cookie, but I'm getting an <code>Internal Server Error</code> as result, when I perform a request. I prototyped a simple Flask app for demonstrating my problem: <pre><code>#!/usr/bin/env python from flask import Flask, session app = Flask(__name__) @app.route('/') def run(): session['tmp'] = 43 return '43' if __name__ == '__main__': app.run() </code></pre> Why I can't store the <code>session</code> cookie with the following value when I perform the request?

18,139,945

3

2

null

2013-08-09 04:10:39.853 UTC

7

2018-10-15 17:44:25.47 UTC

2018-10-12 23:41:32.993 UTC

null

5,780,109

null

2,236,401

null

1

33

python|session|cookies|flask

52,639

According to <a href="http://flask.pocoo.org/docs/quickstart/#sessions">Flask sessions documentation</a>: <blockquote> ... What this means is that the user could look at the contents of your cookie but not modify it, unless they know the secret key used for signing. In order to use sessions you have to set a secret key. </blockquote> Set secret key. And you should return string, not int. <pre><code>#!/usr/bin/env python from flask import Flask, session app = Flask(__name__) @app.route('/') def run(): session['tmp'] = 43 return '43' if __name__ == '__main__': app.secret_key = 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT' app.run() </code></pre>

47,121,961

Can atomics suffer spurious stores?

In C++, can atomics suffer spurious stores? For example, suppose that <code>m</code> and <code>n</code> are atomics and that <code>m = 5</code> initially. In thread 1, <pre><code> m += 2; </code></pre> In thread 2, <pre><code> n = m; </code></pre> Result: the final value of <code>n</code> should be either 5 or 7, right? But could it spuriously be 6? Could it spuriously be 4 or 8, or even something else? In other words, does the C++ memory model forbid thread 1 from behaving as though it did this? <pre><code> ++m; ++m; </code></pre> Or, more weirdly, as though it did this? <pre><code> tmp = m; m = 4; tmp += 2; m = tmp; </code></pre> Reference: <a href="http://www.hpl.hp.com/techreports/2008/HPL-2008-56.pdf" rel="noreferrer">H.-J. Boehm & S. V. Adve, 2008,</a> Figure 1. (If you follow the link, then, in the paper's section 1, see the first bulleted item: "The informal specifications provided by ...") THE QUESTION IN ALTERNATE FORM One answer (appreciated) shows that the question above can be misunderstood. If helpful, then here is the question in alternate form. Suppose that the programmer tried to tell thread 1 to skip the operation: <pre><code> bool a = false; if (a) m += 2; </code></pre> Does the C++ memory model forbid thread 1 from behaving, at run time, as though it did this? <pre><code> m += 2; // speculatively alter m m -= 2; // oops, should not have altered! reverse the alteration </code></pre> I ask because Boehm and Adve, earlier linked, seem to explain that a multithreaded execution can <ul> <li>speculatively alter a variable, but then</li> <li>later change the variable back to its original value when the speculative alteration turns out to have been unnecessary.</li> </ul> COMPILABLE SAMPLE CODE Here is some code you can actually compile, if you wish. <pre><code>#include <iostream> #include <atomic> #include <thread> // For the orignial question, do_alter = true. // For the question in alternate form, do_alter = false. constexpr bool do_alter = true; void f1(std::atomic_int *const p, const bool do_alter_) { if (do_alter_) p->fetch_add(2, std::memory_order_relaxed); } void f2(const std::atomic_int *const p, std::atomic_int *const q) { q->store( p->load(std::memory_order_relaxed), std::memory_order_relaxed ); } int main() { std::atomic_int m(5); std::atomic_int n(0); std::thread t1(f1, &m, do_alter); std::thread t2(f2, &m, &n); t2.join(); t1.join(); std::cout << n << "\n"; return 0; } </code></pre> This code always prints <code>5</code> or <code>7</code> when I run it. (In fact, as far as I can tell, it always prints <code>7</code> when I run it.) However, I see nothing in the semantics that would prevent it from printing <code>6</code>, <code>4</code> or <code>8</code>. The excellent Cppreference.com <a href="http://en.cppreference.com/w/cpp/atomic" rel="noreferrer">states,</a> "Atomic objects are free of data races," which is nice, but in such a context as this, what does it mean? Undoubtedly, all this means that I do not understand the semantics very well. Any illumination you can shed on the question would be appreciated. ANSWERS @Christophe, @ZalmanStern and @BenVoigt each illuminate the question with skill. Their answers cooperate rather than compete. In my opinion, readers should heed all three answers: @Christophe first; @ZalmanStern second; and @BenVoigt last to sum up.

47,125,566

3

18

null

2017-11-05 13:11:55.203 UTC

7

2017-11-05 22:48:53.63 UTC

2017-11-05 22:34:59.96 UTC

null

1,275,653

null

1,275,653

null

1

32

c++|multithreading|atomic|memory-barriers

2,173

The existing answers provide a lot of good explanation, but they fail to give a direct answer to your question. Here we go: <blockquote> can atomics suffer spurious stores? </blockquote> <h1>Yes, but you cannot observe them from a C++ program which is free from data races.</h1> Only <code>volatile</code> is actually prohibited from performing extra memory accesses. <blockquote> does the C++ memory model forbid thread 1 from behaving as though it did this? <pre><code>++m; ++m; </code></pre> </blockquote> Yes, but this one is allowed: <blockquote> <pre><code>lock (shared_std_atomic_secret_lock) { ++m; ++m; } </code></pre> </blockquote> It's allowed but stupid. A more realistic possibility is turning this: <pre><code>std::atomic<int64_t> m; ++m; </code></pre> into <pre><code>memory_bus_lock { ++m.low; if (last_operation_did_carry) ++m.high; } </code></pre> where <code>memory_bus_lock</code> and <code>last_operation_did_carry</code> are features of the hardware platform that can't be expressed in portable C++. Note that peripherals sitting on the memory bus do see the intermediate value, but can interpret this situation correctly by looking at the memory bus lock. Software debuggers won't be able to see the intermediate value. In other cases, atomic operations can be implemented by software locks, in which case: <ol> <li>Software debuggers can see intermediate values, and have to be aware of the software lock to avoid misinterpretation</li> <li>Hardware peripherals will see changes to the software lock, and intermediate values of the atomic object. Some magic may be required for the peripheral to recognize the relationship between the two.</li> <li>If the atomic object is in shared memory, other processes can see the intermediate values and may not have any way to inspect the software lock / may have a separate copy of said software lock</li> <li>If other threads in the same C++ program break type safety in a way that causes a data race (For example, using <code>memcpy</code> to read the atomic object) they can observe intermediate values. Formally, that's undefined behavior.</li> </ol> <hr /> One last important point. The "speculative write" is a very complex scenario. It's easier to see this if we rename the condition: Thread #1 <pre><code>if (my_mutex.is_held) o += 2; // o is an ordinary variable, not atomic or volatile return o; </code></pre> Thread #2 <pre><code>{ scoped_lock l(my_mutex); return o; } </code></pre> There's no data race here. If Thread #1 has the mutex locked, the write and read can't occur unordered. If it doesn't have the mutex locked, the threads run unordered but both are performing only reads. Therefore the compiler cannot allow intermediate values to be seen. This C++ code is not a correct rewrite: <pre><code>o += 2; if (!my_mutex.is_held) o -= 2; </code></pre> because the compiler invented a data race. However, if the hardware platform provides a mechanism for race-free speculative writes (Itanium perhaps?), the compiler can use it. So hardware might see intermediate values, even though C++ code cannot. If intermediate values shouldn't be seen by hardware, you need to use <code>volatile</code> (possibly in addition to atomics, because <code>volatile</code> read-modify-write is not guaranteed atomic). With <code>volatile</code>, asking for an operation which can't be performed as-written will result in compilation failure, not spurious memory access.

54,480,641

flutter - how to create forms in popup

I want to create a form inside a pop-up with flutter like the image below: popup <img src="https://www.formget.com/wp-content/uploads/2014/05/jquery-popup-contact-form.png" alt="popup">. how can I do that with flutter?

54,481,069

5

3

null

2019-02-01 13:35:58.223 UTC

16

2022-01-14 00:52:49.423 UTC

2020-10-24 12:28:46.883 UTC

user10563627

null

10,378,771

null

1

47

flutter|dart|popup|flutter-layout|flutter-form-builder

115,685

Here you go! showDialog takes a WidgetBuilder as a parameter so you can return any widget. <pre><code> import 'package:flutter/material.dart'; void main() { runApp(new MaterialApp(home: new MyApp())); } class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { final _formKey = GlobalKey<FormState>(); @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text("Flutter"), ), body: Center( child: RaisedButton( onPressed: () { showDialog( context: context, builder: (BuildContext context) { return AlertDialog( content: Stack( overflow: Overflow.visible, children: <Widget>[ Positioned( right: -40.0, top: -40.0, child: InkResponse( onTap: () { Navigator.of(context).pop(); }, child: CircleAvatar( child: Icon(Icons.close), backgroundColor: Colors.red, ), ), ), Form( key: _formKey, child: Column( mainAxisSize: MainAxisSize.min, children: <Widget>[ Padding( padding: EdgeInsets.all(8.0), child: TextFormField(), ), Padding( padding: EdgeInsets.all(8.0), child: TextFormField(), ), Padding( padding: const EdgeInsets.all(8.0), child: RaisedButton( child: Text("Submitß"), onPressed: () { if (_formKey.currentState.validate()) { _formKey.currentState.save(); } }, ), ) ], ), ), ], ), ); }); }, child: Text("Open Popup"), ), ), ); } } </code></pre> Hop it helps!

33,124,930

Android 6.0 permission.GET_ACCOUNTS

I'm using this to get permission: <pre><code>if (ContextCompat.checkSelfPermission(context, Manifest.permission.GET_ACCOUNTS) != PackageManager.PERMISSION_GRANTED) { // Should we show an explanation? if (ActivityCompat.shouldShowRequestPermissionRationale(context, Manifest.permission.GET_ACCOUNTS)) { } else { // No explanation needed, we can request the permission. ActivityCompat.requestPermissions(context, new String[]{Manifest.permission.GET_ACCOUNTS}, PERMISSIONS_REQUEST_GET_ACCOUNTS); // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an // app-defined int constant. The callback method gets the // result of the request. } } </code></pre> But the pop up dialog for permission asks user for access Contacts!?!? In pre 6.0 in Play Store with <pre><code><uses-permission android:name="android.permission.GET_ACCOUNTS"/> </code></pre> request is named Identity and explains I need it to get device account.

33,125,123

6

3

null

2015-10-14 12:10:27.597 UTC

9

2019-02-08 11:57:32.357 UTC

2017-09-12 14:35:02.32 UTC

null

3,968,276

null

3,206,119

null

1

37

android|permissions|android-6.0-marshmallow

51,374

That is because of Permission Groups. Basically, permissions are placed under different groups and all permissions from that group would be granted if one of them is granted. Eg. Under "Contacts" , there is write/read contacts and get accounts, so when you ask for any of those, the popup asks for Contacts permissions. Read through: <a href="http://inthecheesefactory.com/blog/things-you-need-to-know-about-android-m-permission-developer-edition/en" rel="noreferrer">Everything every Android Developer must know about new Android's Runtime Permission</a> <hr> EDIT 1 Just thought i'l add the related(not to get accounts but permissions and groups) Oreo update info: source: <a href="https://developer.android.com/about/versions/oreo/android-8.0-changes.html#rmp" rel="noreferrer">https://developer.android.com/about/versions/oreo/android-8.0-changes.html#rmp</a> <blockquote> Prior to Android 8.0 (API level 26), if an app requested a permission at runtime and the permission was granted, the system also incorrectly granted the app the rest of the permissions that belonged to the same permission group, and that were registered in the manifest. For apps targeting Android 8.0, this behavior has been corrected. The app is granted only the permissions it has explicitly requested. However, once the user grants a permission to the app, all subsequent requests for permissions in that permission group are automatically granted. </blockquote> <hr>

1,822,122

How do I add space between items in an ASP.NET RadioButtonList

I've got an ASP.NET RadioButtonList that displays four items using RepeatDirection="Horizontal" to display them on a single line. I'm using RepeatLayout="Flow" to avoid the markup for a table. However, this causes the items in the list to be placed right next to each other, which does not look good. So, I tried the table layout to take advantage of the CellSpacing and/or CellPadding properties. Unfortunately, these properties affect both the vertical and horizontal spacing/padding within the table, so while I get the horizontal spacing, I also get undesired vertical spacing. At this point, I'm down to this: <pre><code><asp:RadioButtonList ID="rblMyRadioButtonList" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow" > <asp:ListItem Selected="false" Text="Item One&nbsp;&nbsp;&nbsp;&nbsp;" Value="Item_1" /> <asp:ListItem Selected="false" Text="Item Two&nbsp;&nbsp;&nbsp;&nbsp;" Value="Item_2" /> <asp:ListItem Selected="false" Text="Item Three&nbsp;&nbsp;&nbsp;&nbsp;" Value="Item_3" /> <asp:ListItem Selected="false" Text="Item Four&nbsp;&nbsp;&nbsp;&nbsp;" Value="Item_4" /> </asp:RadioButtonList> </code></pre> ...which screams at me "You're not doing it right!" What is the right way to accomplish this?

1,822,153

6

0

null

2009-11-30 20:12:28.193 UTC

4

2020-12-24 17:02:15.59 UTC

null

5,420

null

1

29

asp.net|formatting|markup|radiobuttonlist

124,498

Use css to add a right margin to those particular elements. Generally I would build the control, then run it to see what the resulting html structure is like, then make the css alter just those elements. Preferably you do this by setting the class. Add the <code>CssClass="myrblclass"</code> attribute to your list declaration. You can also add attributes to the items programmatically, which will come out the other side. <pre><code>rblMyRadioButtonList.Items[x].Attributes.CssStyle.Add("margin-right:5px;") </code></pre> This may be better for you since you can add that attribute for all but the last one.

2,224,350

PowerShell Start-Job Working Directory

Is there a way to specify a working directory to the Start-Job command? Use-case: I'm in a directory, and I want to open a file using Emacs for editing. If I do this directly, it will block PowerShell until I close Emacs. But using Start-Job attempts to run Emacs from my home directory, thus having Emacs open a new file instead of the one I wanted. I tried to specify the full path using $pwd, but variables in the script block are not resolved until they're executing in the Start-Job context. So some way to force resolving the variables in the shell context would also be an acceptable answer to this. So, here's what I've tried, just for completeness: <pre><code>Start-Job { emacs RandomFile.txt } Start-Job { emacs "$pwd/RandomFile.txt" } </code></pre>

2,246,542

6

0

null

2010-02-08 19:42:22.607 UTC

9

2020-03-19 03:20:49.36 UTC

2011-05-12 16:12:28.413 UTC

null

64,046

null

12,275

null

1

33

powershell|start-job

19,491

A possible solution would be to create a "kicker-script": <pre><code>Start-Job -filepath .\emacs.ps1 -ArgumentList $workingdir, "RandomFile.txt" </code></pre> Your script would look like this: <pre><code>Set-Location $args[0] emacs $args[1] </code></pre> Hope this helps.

2,008,101

Recommendations for learning ASP.NET MVC from a desktop developer's perspective

One of my New Year's Resolutions is to finally learn some web development. I've decided on ASP.NET MVC as I'm a believer in TDD and IoC. I'm looking for a list of topics and perhaps an order to learn them for what I'll need to know to be a solid ASP.NET MVC developer. Perhaps this is embarassing, but the only web experience I have was html pages I made using WYSIWYG editors 5+ years ago when I was in college.

2,008,289

7

0

2010-01-05 18:12:19.85 UTC

10

2010-08-02 15:23:05.96 UTC

2010-01-06 14:15:57.69 UTC

null

135,148

null

135,148

null

1

9

asp.net-mvc

5,091

So first, congratulations on picking ASP.NET MVC. I dare say that ASP.NET MVC is easier to work with than WebForms. WebForms tends to take somewhat of a "black-box" approach to the web and treat it more like classic WinForms development. WebForms would probably be a slightly more comfortable technology for you (coming from WinForms development) but MVC will leave you with a greater understanding of how the web works, which is incredibly important. Before you dive into ASP.NET MVC, you may want to brush up on the basics of HTTP, because it is important to understand when you starting writing action methods that respond differently based on request verbs. It's also nice to know exactly what HTTP headers are, and how they can be leveraged in your application. Anyway, here's my list for you: <h2>Important People and Their Blogs</h2> <ul> <li><a href="http://www.haacked.com/" rel="noreferrer">Phil Haack</a>: He is the lead developer on ASP.NET MVC, and his blog has tons of neat tricks and tips for using it.</li> <li><a href="http://www.hanselman.com/" rel="noreferrer">Scott Hanselman</a>: He worked with the team on NerdDinner and from time to time his blog has some neat MVC stuff.</li> <li><a href="http://blog.wekeroad.com/" rel="noreferrer">Rob Conery</a>: Rob's an avid promoter of ASP.NET MVC and an active open-source contributor. He has tons of code on github for you to browse for inspiration/guidance, and he also has tons of screencasts on his blog and on his business website, <a href="http://www.tekpub.com/" rel="noreferrer">TekPub</a>. I recommend purchasing his screencasts from TekPub because he's just an amazing presenter and makes understanding ASP.NET MVC so easy.</li> <li><a href="http://weblogs.asp.net/scottgu/" rel="noreferrer">Scott Guthrie</a>: He wrote the first chapter with respects to NerdDinner in the Professional ASP.NET MVC 1.0 book, and he always has some cool posts about new features coming in ASP.NET MVC.</li> <li><a href="http://stephenwalther.com/blog/default.aspx" rel="noreferrer">Steven Walther</a>: It seems like every time I look at his blog he's got another cool trick or code snippet related to ASP.NET MVC. He's also written a book on ASP.NET MVC that has some pretty good reviews on Amazon.</li> </ul> <h2>Reading Material</h2> <ul> <li><a href="http://www.wdvl.com/Internet/Protocols/HTTP/" rel="noreferrer">WDVL: HyperText Transfer Protocol</a>: Again, this is your HTTP tutorial. I've read through part of it and it seems pretty decent. You don't need a rock solid understanding of HTTP, but a general overview of request verbs and headers specifically will help you.</li> <li><a href="http://aspnetmvcbook.s3.amazonaws.com/aspnetmvc-nerdinner_v1.pdf" rel="noreferrer">NerdDinner.com Tutorial</a>: This is lengthy step-by-step guide written by ScottGu himself about how to create a basic ASP.NET MVC website from beginning to end.</li> <li><a href="https://rads.stackoverflow.com/amzn/click/com/0470384611" rel="noreferrer" rel="nofollow noreferrer">Profesional ASP.NET MVC 1.0</a>: This is a book by the team that wrote this ASP.NET MVC, and it really does a great job of explaining the framework.</li> <li><a href="https://rads.stackoverflow.com/amzn/click/com/0672329980" rel="noreferrer" rel="nofollow noreferrer">ASP.NET MVC Framework Unleashed</a>: This is Steven Walther's book on the framework. It has some decent reviews on Amazon, though I've never read it myself, so I couldn't really give my opinion one way or the other.</li> </ul> <h2>Screencasts</h2> <ul> <li><a href="http://blog.wekeroad.com/category/mvc-storefront" rel="noreferrer">Rob Conery's MVC Storefront Series</a>: These screencasts are amazingly helpful. In the beginning they were working against pre-release copies of the MVC framework, so some stuff has changed, but they're still amazing material for learning ASP.NET MVC.</li> <li><a href="http://weblogs.asp.net/scottgu/archive/2010/01/02/asp-net-4-asp-net-mvc-and-silverlight-4-videos-of-my-talks-in-europe.aspx" rel="noreferrer">Scott Guthrie's Presentations on ASP.NET MVC 2</a>: Look at the ASP.NET MVC section of this page. There are some really neat new features coming in ASP.NET MVC 2, and Scott actually builds a good foundation from the ground up with this presentation. He takes you through beginner stuff first and then shows the neat new tricks later.</li> <li><a href="http://videos.visitmix.com/MIX09/T50F" rel="noreferrer">Phil Haack's MIX09 MVC Session</a>: Great content here straight from the man himself. Phil's actually a great presenter, and there's a lot of good content here.</li> <li><a href="http://videos.visitmix.com/MIX09/T44F" rel="noreferrer">Phil Haack's MIX09 Advanced MVC Session</a>: Some more advanced stuff and neat tricks from Phil.</li> <li><a href="http://videos.visitmix.com/MIX09/T49F" rel="noreferrer">Scott Hanselman's File -> New Company MIX09 Session</a>: I actually attended this session while I was at MIX09, and Scott's a great presenter. Well worth a gander :)</li> <li><a href="http://www.tekpub.com/preview/aspmvc" rel="noreferrer">Rob Conery and Steven Sanderson TekPub Screencasts</a>: These aren't free, but they're worth every penny. Rob and Steven are amazing teachers, and I can't recommend TekPub screencasts enough. They are top-notch.</li> </ul> <h2>IoC and Dependency Injection</h2> Since you mentioned IoC specifically in your OP, there are a few libraries and blog posts that might help you with that: <ul> <li><a href="http://codeclimber.net.nz/archive/2009/08/10/how-to-use-ninject-2-with-asp.net-mvc.aspx" rel="noreferrer">Simone Chiaretta: How to use Ninject 2 with ASP.NET MVC</a>: I actually use Ninject in my own personal projects, so this is a great resource if you're a fan of Ninject.</li> <li><a href="http://github.com/robconery/Hana" rel="noreferrer">Rob Conery's "Hana" Source Code</a>: Sometimes I just love seeing some quality reference code. This is actually the source for Rob's blog. He was using StructureMap originally, but I think he changed recently to Ninject.Mvc.</li> <li><a href="http://blog.wekeroad.com/mvc-storefront/mvcstore-part-13/" rel="noreferrer">MVC Storefront DI Screencast</a>: Rob talks about setting up dependency injection in the MVC Storefront. This one uses StructureMap I believe.</li> <li><a href="http://www.tekpub.com/view/concepts/1" rel="noreferrer">TekPub Concepts video (free)</a>: Rob goes over the basics of IoC and DI in this video if you need a refresher. It's free too :)</li> </ul> <h2>Other Pertinent Web Technologies</h2> Because you're looking to move to the web, there are other languages and technologies that you need to know as well. Below is a list of some brief tutorials to get you started, although each of these subjects could easily warrant a post as big (or bigger) than this one! <ul> <li><a href="http://www.w3schools.com/html/default.asp" rel="noreferrer">HTML</a>: Seems silly that I'm mentioning this here, but I only mention it because there's a lot of push these days to write valid HTML. A majority of accessibility and browser incompatibility issues can be averted by having clean markup. I personally use XHTML in my sites, but any doctype will do :)</li> <li><a href="http://www.w3schools.com/js/default.asp" rel="noreferrer">JavaScript</a>: This is a neat language that can be used to make many web applications feel more like a desktop application (amongst other things). There are a lot of performance gains and design victories that can be had by properly leveraging JavaScript. Once you feel comfortable with JavaScript, you will probably want to make the move to a JavaScript library to make cross-browser compatibility very easy. My JavaScript library of choice is <a href="http://www.jquery.com" rel="noreferrer">jQuery</a>.</li> <li><a href="http://www.w3schools.com/css/default.asp" rel="noreferrer">CSS</a>: This is how you should be applying style to your websites. One of the biggest mistakes a lot of developers make is to make their HTML in charge of presentation (using tables for layouts [holy war], etc. etc.). Arguments and holy wars aside, CSS is a valid skill to have, and it really isn't as hard as some might have you believe :)</li> </ul> I know this seems like a lot, and I've probably inundated you with material to read, however I think it's important to build a solid foundation. Web development is a lot of fun when you are good at it, and it's definitely a great way to make a living! Good luck! ASP.NET MVC is a great framework, and you've made a great choice. Oh yeah, and there are a few other things you might want to Google in your spare time. They tend to be pretty advanced, so I didn't include them here, but you will run into them when you get more involved in the web world: <ul> <li>AJAX: Makes your web applications perform more naturally and do things in the background.</li> <li>Web Services: A universal way to exchange data on the web. For example, there are web services that provide weather forecasts and stock quotes. You can consume them and even create some of your own!</li> <li>XML and JSON: These are used to describe data. When you serialize data on the web, XML and/or JSON are the conventional technologies most developers use. JSON is popular particularly because it can be consumed so nicely within JavaScript.</li> </ul>

1,682,920

Determine If a User Is Idented On IRC

In my IRC Bot, there are some commands that I want to only be usable by me, and I want to check to make sure that anyone using my name is identified with nickserv (idented). I couldn't, however, find an easy way to determine this, which is why I'm here. <a href="http://freenode.net/" rel="noreferrer">Freenode</a> and <a href="http://www.rizon.net/" rel="noreferrer">Rizon</a> are the primary target networks, if that matters. Edit: I was actually aware of the various usermodes for idented users (although I didn't pay enough attention to realize that they differ!); sorry for not mentioning that before. The raw response that I get from a user, however, doesn't include their usermodes; it looks something like this: <pre><code>:[email protected] PRIVMSG #erasmus-testing :foo </code></pre> I suppose, then, that I'm trying to find a way (with various ircds, grr) to get those flags. If, as someone mentioned, Rizon returns whether or not someone is idented in a WHOIS query, then that's the sort of thing I'm looking for.

1,733,975

7

0

null

2009-11-05 19:19:56.22 UTC

9

2019-01-31 12:27:30.653 UTC

2009-11-06 01:50:05.72 UTC

null

120,999

null

120,999

null

1

11

irc|bots

9,814

On freenode, sending a private message to nickserv with the message <code>ACC <nickname></code> will return a number that indicates the user's ident status: <blockquote> The answer is in the form <code><nickname> ACC <digit></code>: <pre><code> 0 - account or user does not exist 1 - account exists but user is not logged in 2 - user is not logged in but recognized (see ACCESS) 3 - user is logged in </code></pre> </blockquote> The <code>STATUS <nickname></code> command gives similar results on Rizon: <blockquote> The response has this format: <code><nickname> <digit></code> <pre><code> 0 - no such user online or nickname not registered 1 - user not recognized as nickname's owner 2 - user recognized as owner via access list only 3 - user recognized as owner via password identification </code></pre> </blockquote> The advantages that this method has over a WHOIS: <ol> <li>Information about ident status is always included. With WHOISes, you will just not get a line saying something along the lines of "identified with nickserv as such-and-such" if the user is not, in fact, idented.</li> <li>Consistent number of lines returned. Since I want to grab the message before passing on control to the rest of my program, I can easily read one line out of the buffer (I see synchronization issues in your future!), determine the status, and continue on like normal.</li> </ol>

2,191,632

Begin, Rescue and Ensure in Ruby?

I've recently started programming in Ruby, and I am looking at exception handling. I was wondering if <code>ensure</code> was the Ruby equivalent of <code>finally</code> in C#? Should I have: <pre><code>file = File.open("myFile.txt", "w") begin file << "#{content} \n" rescue #handle the error here ensure file.close unless file.nil? end </code></pre> or should I do this? <pre><code>#store the file file = File.open("myFile.txt", "w") begin file << "#{content} \n" file.close rescue #handle the error here ensure file.close unless file.nil? end </code></pre> Does <code>ensure</code> get called no matter what, even if an exception isn't raised?

2,192,010

7

1

null

2010-02-03 11:54:15.12 UTC

241

2020-03-25 08:40:02.617 UTC

2014-01-23 12:57:02.177 UTC

null

128,421

null

67,258

null

1

611

ruby-on-rails|ruby|exception|exception-handling|error-handling

471,151

Yes, <code>ensure</code> ensures that the code is always evaluated. That's why it's called <code>ensure</code>. So, it is equivalent to Java's and C#'s <code>finally</code>. The general flow of <code>begin</code>/<code>rescue</code>/<code>else</code>/<code>ensure</code>/<code>end</code> looks like this: <pre><code>begin # something which might raise an exception rescue SomeExceptionClass => some_variable # code that deals with some exception rescue SomeOtherException => some_other_variable # code that deals with some other exception else # code that runs only if *no* exception was raised ensure # ensure that this code always runs, no matter what # does not change the final value of the block end </code></pre> You can leave out <code>rescue</code>, <code>ensure</code> or <code>else</code>. You can also leave out the variables in which case you won't be able to inspect the exception in your exception handling code. (Well, you can always use the global exception variable to access the last exception that was raised, but that's a little bit hacky.) And you can leave out the exception class, in which case all exceptions that inherit from <code>StandardError</code> will be caught. (Please note that this does not mean that all exceptions are caught, because there are exceptions which are instances of <code>Exception</code> but not <code>StandardError</code>. Mostly very severe exceptions that compromise the integrity of the program such as <code>SystemStackError</code>, <code>NoMemoryError</code>, <code>SecurityError</code>, <code>NotImplementedError</code>, <code>LoadError</code>, <code>SyntaxError</code>, <code>ScriptError</code>, <code>Interrupt</code>, <code>SignalException</code> or <code>SystemExit</code>.) Some blocks form implicit exception blocks. For example, method definitions are implicitly also exception blocks, so instead of writing <pre><code>def foo begin # ... rescue # ... end end </code></pre> you write just <pre><code>def foo # ... rescue # ... end </code></pre> or <pre><code>def foo # ... ensure # ... end </code></pre> The same applies to <code>class</code> definitions and <code>module</code> definitions. However, in the specific case you are asking about, there is actually a much better idiom. In general, when you work with some resource which you need to clean up at the end, you do that by passing a block to a method which does all the cleanup for you. It's similar to a <code>using</code> block in C#, except that Ruby is actually powerful enough that you don't have to wait for the high priests of Microsoft to come down from the mountain and graciously change their compiler for you. In Ruby, you can just implement it yourself: <pre><code># This is what you want to do: File.open('myFile.txt', 'w') do |file| file.puts content end # And this is how you might implement it: def File.open(filename, mode='r', perm=nil, opt=nil) yield filehandle = new(filename, mode, perm, opt) ensure filehandle&.close end </code></pre> And what do you know: this is already available in the core library as <code>File.open</code>. But it is a general pattern that you can use in your own code as well, for implementing any kind of resource cleanup (à la <code>using</code> in C#) or transactions or whatever else you might think of. The only case where this doesn't work, if acquiring and releasing the resource are distributed over different parts of the program. But if it is localized, as in your example, then you can easily use these resource blocks. <hr> BTW: in modern C#, <code>using</code> is actually superfluous, because you can implement Ruby-style resource blocks yourself: <pre><code>class File { static T open<T>(string filename, string mode, Func<File, T> block) { var handle = new File(filename, mode); try { return block(handle); } finally { handle.Dispose(); } } } // Usage: File.open("myFile.txt", "w", (file) => { file.WriteLine(contents); }); </code></pre>

1,831,353

The speed of .NET in numerical computing

In my experience, .NET is 2 to 3 times slower than native code. (I implemented L-BFGS for multivariate optimization). I have traced the ads on stackoverflow to <a href="http://www.centerspace.net/products/" rel="noreferrer">http://www.centerspace.net/products/</a> the speed is really amazing, the speed is close to native code. How can they do that? They said that: <blockquote> Q. Is NMath "pure" .NET? A. The answer depends somewhat on your definition of "pure .NET". NMath is written in C#, plus a small Managed C++ layer. For better performance of basic linear algebra operations, however, NMath does rely on the native Intel Math Kernel Library (included with NMath). But there are no COM components, no DLLs--just .NET assemblies. Also, all memory allocated in the Managed C++ layer and used by native code is allocated from the managed heap. </blockquote> Can someone explain more to me?

1,831,564

8

4

null

2009-12-02 08:09:30.147 UTC

11

2016-03-15 19:04:09.413 UTC

2020-06-20 09:12:55.06 UTC

null

-1

null

183,828

null

1

18

c#|.net|managed-c++|managed-code|nmath

6,965

The point about C++/CLI is correct. To complete the picture, just two additional interesting points: <ul> <li>.NET memory management (garbage collector) obviously is not the problem here, as NMath still depends on it</li> <li>The performance advantage is actually provided by Intel MKL, which offers implementations extremely optimized for many CPUs. From my point of view, this is the crucial point. Using straight-forward, naiv C/C++ code wont necessarily give you superior performance over C#/.NET, it's sometimes even worse. However C++/CLI allows you to exploit all the "dirty" optimization options.</li> </ul>

2,074,454

Override a static method

I am extending a new class by inheriting from RolesService. In RolesService I have a static methog that I would like to override in my newly derived class. When I make the call from my derived object it does not use the overridden static method it actually calls the base class method. Any ideas? <pre><code>public class RolesService : IRolesService { public static bool IsUserInRole(string username, string rolename) { return Roles.IsUserInRole(username, rolename); } } public class MockRoleService : RolesService { public new static bool IsUserInRole(string username, string rolename) { return true; } } </code></pre>

2,075,226

10

1

null

2010-01-15 20:09:14.893 UTC

7

2020-12-06 16:20:38.727 UTC

2017-11-03 17:37:00.423 UTC

null

4,684,797

null

106,403

null

1

40

c#|asp.net|asp.net-mvc

63,986

Doing the following the will allow you to work around the static call. Where you want to use the code take an IRolesService via dependency injection then when you need MockRolesService you can pass that in. <pre><code>public interface IRolesService { bool IsUserInRole(string username, string rolename); } public class RolesService : IRolesService { public bool IsUserInRole(string username, string rolename) { return Roles.IsUserInRole(username, rolename); } } public class MockRoleService : IRolesService { public bool IsUserInRole(string username, string rolename) { return true; } } </code></pre>

1,387,612

How can I introduce multiple conditions in LIKE operator?

I want to write an SQL statement like below: <pre><code>select * from tbl where col like ('ABC%','XYZ%','PQR%'); </code></pre> I know it can be done using <code>OR</code>. But I want to know is there any better solution.

1,387,627

10

6

null

2009-09-07 05:03:38.097 UTC

34

2021-10-07 16:44:20.347 UTC

2020-12-14 14:16:51.92 UTC

null

1,783,163

null

147,025

null

1

83

sql|oracle

436,954

Here is an alternative way: <pre><code>select * from tbl where col like 'ABC%' union select * from tbl where col like 'XYZ%' union select * from tbl where col like 'PQR%'; </code></pre> Here is the test code to verify: <pre><code>create table tbl (col varchar(255)); insert into tbl (col) values ('ABCDEFG'), ('HIJKLMNO'), ('PQRSTUVW'), ('XYZ'); select * from tbl where col like 'ABC%' union select * from tbl where col like 'XYZ%' union select * from tbl where col like 'PQR%'; +----------+ | col | +----------+ | ABCDEFG | | XYZ | | PQRSTUVW | +----------+ 3 rows in set (0.00 sec) </code></pre>

8,903,601

How to process a form (via get or post) using class-based views?

Im trying to learn class-based views, for a detail or list view is not that complicated. I have a search form and I just want to see if I send a query to show up the results. Here is the function code (is not mine, is from a django book): <pre><code>def search_page(request): form = SearchForm() bookmarks = [] show_results = False if 'query' in request.GET: show_results = True query = request.GET['query'].strip() if query: form = SearchForm({'query': query}) bookmarks = Bookmark.objects.filter(title__icontains=query)[:10] show_tags = True show_user = True if request.is_ajax(): return render_to_response("bookmarks/bookmark_list.html", locals(), context_instance=RequestContext(request)) else: return render_to_response("search/search.html", locals(), context_instance=RequestContext(request)) </code></pre> Ignoring the ajax fact (just to make the problem easier for now), how can I translate this to class-based views? I quick tried something like this: <pre><code>class SearchPageView(FormView): template_name = 'search/search.html' def get(self, request, *args, **kwargs): form = SearchForm() self.bookmarks = [] self.show_results = False if 'query' in self.request.GET: self.show_results = True query = self.request.GET['query'].strip() if query: form = SearchForm({'query': query}) self.bookmarks = Bookmark.objects.filter(title__icontains=query)[:10] return super(SearchPageView, self).get(request, *args, **kwargs) def get_context_data(self, **kwargs): context = super(SearchPageView, self).get_context_data(**kwargs) context.update({ 'show_tags': True, 'show_user': True, 'show_results': self.show_results, 'bookmarks': self.bookmarks }) return context </code></pre> Doesn't work, I get a: "'NoneType' object is not callable" Fair enough, I started today with this stuff. So, what's the way to make a Class-based views that can manage a get (and a post too if needed) request? I have another example: <pre><code>@render_to('registration/register.html') def register_page(request): if request.method == 'POST': form = RegistrationForm(request.POST) if form.is_valid(): user = User.objects.create_user( username=form.cleaned_data['username'], password=form.cleaned_data['password1'], email=form.cleaned_data['email'] ) return HttpResponseRedirect('/accounts/register/success/') else: form = RegistrationForm() return locals() </code></pre> Would this be "transformed" the same way that the first one? Or they extend differents Views? Im confused a lot. I don't know if the first is ProcessFormView and the second FormView or what. Thanks. EDIT: Solution I ended with: <pre><code>class SearchPageView(FormView): template_name = 'search/search.html' def get(self, request, *args, **kwargs): self.bookmarks = [] self.show_results = False form = SearchForm(self.request.GET or None) if form.is_valid(): self.show_results = True self.bookmarks = Bookmark.objects.filter(title__icontains=form.cleaned_data['query'])[:10] return self.render_to_response(self.get_context_data(form=form)) def get_context_data(self, **kwargs): context = super(SearchPageView, self).get_context_data(**kwargs) context.update({ 'show_tags': True, 'show_user': True, 'show_results': self.show_results, 'bookmarks': self.bookmarks }) return context </code></pre> I leave this here to someone with same question :)

8,903,801

2

null

2012-01-18 00:25:12.587 UTC

25

2015-01-03 21:29:51.35 UTC

2012-01-19 10:35:25.86 UTC

null

123,204

null

123,204

null

1

37

django|django-class-based-views

58,239

The default behaviour of the <a href="https://docs.djangoproject.com/en/dev/ref/class-based-views/generic-editing/#formview" rel="noreferrer"><code>FormView</code></a> class is to display an unbound form for <code>GET</code> requests, and bind the form for <code>POST</code> (or <code>PUT</code>) requests. If the bound form is valid, then the <code>form_valid</code> method is called, which simply redirects to the success url (defined by the <code>success_url</code> attribute or the <code>get_success_url</code> method. This matches the example quite well. You need to override the <code>form_valid</code> method to create the new <code>User</code>, before calling the superclass method to redirect to the success url. <pre><code>class CreateUser(FormView): template_name = 'registration/register.html' success_url = '/accounts/register/success/' form_class = RegistrationForm def form_valid(self, form): user = User.objects.create_user( username=form.cleaned_data['username'], password=form.cleaned_data['password1'], email=form.cleaned_data['email'] ) return super(CreateUser, self).form_valid(form) </code></pre> Your first example does not match the flow of <code>FormView</code> so well, because you aren't processing a form with <code>POST</code> data, and you don't do anything when the form is valid. I might try extending <code>TemplateView</code>, and putting all the logic in <code>get_context_data</code>. Once you get that working, you could factor the code that parses the GET data and returns the bookmarks into its own method. You could look at extending <code>ListView</code>, but I don't think there's any real advantage unless you want to paginate results.

6,930,584

Proper Android REST client

I made my own REST client library for an Android application, but after watching the <a href="http://www.google.com/events/io/2010/sessions/developing-RESTful-android-apps.html" rel="nofollow">Google I/O presentation</a> on the subject I realized I had it all wrong (precisely what they show slide 9). Now I am looking to do it again the right way, but I'm wondering if there isn't a library that could save me the trouble. We use Jersey on the server side. I've looked at different solutions : <a href="http://crest.codegist.org/" rel="nofollow">CRest</a> and <a href="http://beders.github.com/Resty/Resty/Overview.html" rel="nofollow">Resty</a>, but what I'd like to find an Android solution so I don't have to implement the ContentProvider stuff myself, and <a href="http://code.google.com/p/android-jbridge/" rel="nofollow">android-jbridge</a>, but it doesn't look very active. At this point I'm considering using <a href="http://static.springsource.org/spring-android/docs/1.0.x/reference/html/rest-template.html" rel="nofollow">RestTemplate</a> (from Spring Android) and writing the stuff around it myself, but that'll take some time. Any better alternative?

8,694,157

3

4

null

2011-08-03 17:28:13.137 UTC

9

2015-02-11 06:39:31.413 UTC

2013-06-27 17:31:17.837 UTC

null

318,557

null

318,557

null

1

12

android|rest|jersey|rest-client

9,133

"Developing Android REST client applications" by Virgil Dobjanschi led to much discussion, since no source code was presented during the session or was provided afterwards. The only reference implementation I know (please comment if you know more) is available at <a href="http://datadroid.foxykeep.com" rel="noreferrer">Datadroid</a> (the Google IO session is mentioned under /presentation). It is a library which you can use in your own application. Update There are other libraries available. I do not know how they confirm to Dobjanschis patterns, but I would like to list them for your reference (text is taken from the homepage of the library): <ul> <li><a href="https://github.com/octo-online/robospice" rel="noreferrer">RoboSpice</a> is a modular android library that makes writing asynchronous long running tasks easy. It is specialized in network requests, supports caching and offers REST requests out-of-the box using extension modules.</li> <li><a href="https://github.com/PCreations/RESTDroid" rel="noreferrer">RESTDroid</a> (currently alpha) provides a way to handle calls to REST web-services. It contains only the fundamental logic to handle these requests, extension is possible with modules (some are provided). </li> </ul>

6,551,777

How to check if SP1 for SQL Server 2008 R2 is already installed?

I have trouble figuring out if the SP1 is already installed. I don't think I could check it from the Management Studio as its a different application. But the SQl server it self has no UI to check under "about". :) Any ideas?

6,551,847

3

0

null

2011-07-01 18:22:51.63 UTC

3

2017-08-16 01:05:01.77 UTC

2012-01-10 09:38:28.813 UTC

null

626,273

null

92,153

null

1

16

sql-server-express|sql-server-2008-r2

46,237

There is not SP1 for SQL Server 2008 R2 just yet..... But to check, you can inspect the <code>productlevel</code> server property: <pre><code>SELECT SERVERPROPERTY('productlevel') </code></pre> This will contain <code>RTM</code> for the original RTM version (as it is in my case with SQL Server 2008 R2 now), or it will contain info about the service pack installed. I typically use this SQL query: <pre><code>SELECT SERVERPROPERTY('productversion') as 'Product Version', SERVERPROPERTY('productlevel') as 'Patch Level', SERVERPROPERTY('edition') as 'Product Edition', SERVERPROPERTY('buildclrversion') as 'CLR Version', SERVERPROPERTY('collation') as 'Default Collation', SERVERPROPERTY('instancename') as 'Instance', SERVERPROPERTY('lcid') as 'LCID', SERVERPROPERTY('servername') as 'Server Name' </code></pre> This lists your server version, edition, service pack (if applicable) etc. - something like this: <pre><code>Product Version Patch Level Product Edition CLR Version Default Collation Instance LCID Server Name 10.50.1617.0 RTM Developer Edition (64-bit) v2.0.50727 Latin1_General_CI_AS NULL 1033 ********* </code></pre> Update: this answer was correct when it was posted - July 2011. By now, November 2012, there's <a href="http://www.microsoft.com/en-us/download/details.aspx?id=30437" rel="noreferrer">SQL Server 2008 R2 Service Pack 2</a> available for download

6,777,419

How to configure Spring to make JPA (Hibernate) and JDBC (JdbcTemplate or MyBatis) share the same transaction

I have a single dataSource, I use Spring 3.0.3, Hibernate 3.5.1 as JPA provider and I use MyBatis 3.0.2 for some queries and my app runs on Tomcat 6. I have a HibernateDAO and a MyBatisDAO, when I call both from the same method which is annotated with @Transactional it looks like they don't share the same transaction, they get different connections. How can I make them to do? I've tried getting a connection from DataSourceUtils.getConnection(dataSource) and I get the one which is used by MyBatis which is strange I thought the problem was in MyBatis config and it can't use JpaTransactionManager. Even calling multiple times DataSoruceUtils.getConnection gives the same connection always, which is ok. After some googling I've tried spring-instrument-tomcat's classloader (although I don't know if tomcat really uses it :)) partial applicationContext <pre class="lang-xml prettyprint-override"><code><bean class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" id="dataSource"> <property name="driverClassName" value="${database.driverClassName}"/> <property name="url" value="${database.url}"/> <property name="username" value="${database.username}"/> <property name="password" value="${database.password}"/> </bean> <bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory"/> </bean> <tx:annotation-driven mode="aspectj" transaction-manager="transactionManager"/> <bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="entityManagerFactory"> <property name="dataSource" ref="dataSource"/> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="configLocation" value="classpath:META-INF/mybatis/mybatis-config.xml" /> </bean> </code></pre> partial mybatis config <pre class="lang-xml prettyprint-override"><code><settings> <setting name="cacheEnabled" value="false" /> <setting name="useGeneratedKeys" value="false" /> <setting name="defaultExecutorType" value="REUSE" /> <setting name="lazyLoadingEnabled" value="false"/> </settings> </code></pre> partial persistence.xml <pre class="lang-xml prettyprint-override"><code><persistence-unit name="persistenceUnit" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.ejb.HibernatePersistence</provider> </code></pre>

6,784,884

3

1

null

2011-07-21 14:11:23.357 UTC

22

2012-02-09 09:17:58.137 UTC

null

299,788

null

1

28

hibernate|spring|jpa|transactions|mybatis

31,926

I've found the solution here: <a href="https://stackoverflow.com/questions/2673678/what-transaction-manager-should-i-use-for-jbdc-template-when-using-jpa">What transaction manager should I use for JBDC template When using JPA ?</a> I'm using JpaTransactionManager and not DataSourceTransactionManager. JavaDoc <a href="http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/jpa/JpaTransactionManager.html" rel="noreferrer">http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/orm/jpa/JpaTransactionManager.html</a> <blockquote> This transaction manager also supports direct DataSource access within a transaction (i.e. plain JDBC code working with the same DataSource). This allows for mixing services which access JPA and services which use plain JDBC (without being aware of JPA)! Application code needs to stick to the same simple Connection lookup pattern as with DataSourceTransactionManager (i.e. DataSourceUtils.getConnection(javax.sql.DataSource) or going through a TransactionAwareDataSourceProxy). Note that this requires a vendor-specific JpaDialect to be configured. </blockquote> After I've added jpaVendorAdapter to my entityManagerFactory config everything works, both JdbcTemplate query and MyBatis runs in the same transaction as expected. Based on the JavaDoc I guess a jpaDialect should be enough but it's 4 a.m. here so I won't try that now :) <pre><code><bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="entityManagerFactory"> <property name="persistenceUnitName" value="persistenceUnit"/> <property name="dataSource" ref="dataSource"/> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="showSql" value="true" /> <property name="generateDdl" value="true" /> <property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect" /> </bean> </property> </bean> </code></pre>

6,697,614

How to draw a triangle programmatically

I have a triangle solver, I want a way to use the values I get from the answer to draw a triangle to the screen that matches it.

6,697,796

3

2

null

2011-07-14 17:42:29.86 UTC

13

2017-09-20 00:03:21.213 UTC

2011-07-14 17:49:44.917 UTC

null

19,679

null

804,306

null

1

31

iphone|ios|cocoa-touch|quartz-graphics

29,530

If you subclass a UIView you can implement something like this in drawRect to draw a triangle: <pre><code>-(void)drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextBeginPath(ctx); CGContextMoveToPoint (ctx, CGRectGetMinX(rect), CGRectGetMinY(rect)); // top left CGContextAddLineToPoint(ctx, CGRectGetMaxX(rect), CGRectGetMidY(rect)); // mid right CGContextAddLineToPoint(ctx, CGRectGetMinX(rect), CGRectGetMaxY(rect)); // bottom left CGContextClosePath(ctx); CGContextSetRGBFillColor(ctx, 1, 1, 0, 1); CGContextFillPath(ctx); } </code></pre>

6,552,980

ASP.NET MVC: Html.EditorFor and multi-line text boxes

This is my code: <pre><code> <div class="editor-label"> @Html.LabelFor(model => model.Comments[0].Comment) </div> <div class="editor-field"> @Html.EditorFor(model => model.Comments[0].Comment) @Html.ValidationMessageFor(model => model.Comments[0].Comment) </div> </code></pre> This is what it generates: <pre><code> <div class="editor-label"> <label for="Comments_0__Comment">Comment</label> </div> <div class="editor-field"> <input class="text-box single-line" data-val="true" data-val-required="The Comment field is required." id="Comments_0__Comment" name="Comments[0].Comment" type="text" value="" /> </div> </code></pre> How do I tell it that the field should be a text box with five lines instead of just a single-line text box?

6,553,039

3

1

null

2011-07-01 20:36:31.443 UTC

6

2017-06-23 14:15:05.483 UTC

null

5,274

null

1

54

asp.net-mvc-3|razor

114,389

Use data type 'MultilineText': <pre><code>[DataType(DataType.MultilineText)] public string Text { get; set; } </code></pre> See <a href="https://stackoverflow.com/questions/4927003/asp-net-mvc3-textarea-with-html-editorfor">ASP.NET MVC3 - textarea with @Html.EditorFor</a>

6,469,683

Format() function doesn't work?

I am trying to execute following built-in function in sql but it gives me error that this function doesn't exist my query: <pre><code>select EmpId, EmpName, format(EmpJoinDate, "YYYY-DD-MM") as date from Employee </code></pre> Error i am getting: <pre><code>'format' is not a recognized built-in function name </code></pre> What may be the problem, or what am i doing wrong? Thanks!

6,469,714

4

0

null

2011-06-24 15:02:36.833 UTC

1

2020-01-24 19:28:30.763 UTC

2011-06-27 18:23:41.91 UTC

null

787,016

user728885

null

1

14

sql|sql-server-2005|tsql|sql-server-2008|format

53,802

Use <a href="http://msdn.microsoft.com/en-us/library/ms187928.aspx" rel="noreferrer"><code>Convert</code></a> function instead. Example: <pre><code>select convert(varchar(5), GETDATE(), 126) + convert(varchar(5), GETDATE(), 105) </code></pre>

23,551,729

SQL Server 2012 installation Reporting Services Catalog error

I'm installing SQL Server 2012 at the moment and when I was about to run the installation, this error pops up: <img src="https://i.stack.imgur.com/rgr1C.png" alt="The errors can be seen clearly in this picture"> On clicking the first failed test, which is "Reporting Services Catalog Database File Existence", this is what i get: <img src="https://i.stack.imgur.com/Ipmqu.png" alt="enter image description here"> On clicking the second failed test, which is "Reporting Services Catalog Temporary Database File Existence", this is what i get: <img src="https://i.stack.imgur.com/MV3XS.png" alt="enter image description here"> So basically, both of the message box says me that "Catalog Database File" & "Catalog Temporary database files exists". Because of this, i need to select Reporting Services file-only mode installation. My questions are: <ol> <li>How do i select file-only mode installation?</li> <li>Do i've to close the setup and do something and afterwards run the setup again?</li> </ol> Btw, I had SQL Server 2012 installed before. I uninstalled it completely due to some strange errors and decided to reinstall a fresh copy of SQL Server 2012 and now I'm stuck with these errors. Any help will be sincerely appreciated. :)

23,551,886

2

null

2014-05-08 20:19:19.957 UTC

13

2017-09-11 10:47:16.197 UTC

null

3,584,973

null

1

50

sql|sql-server|visual-studio-2012|sql-server-2012

53,386

Since you already had one installation of SQL Server done before, there was a database already created. That did not get removed. So when you reinstall, its trying to create the database with the same name, hence, the error. You need to delete the old files to continue the new installation. <blockquote> From the direcotry <code>C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA</code> Remove the following files <ul> <li><code>ReportServer.mdf</code></li> <li><code>ReportServer_log.LDF</code></li> <li><code>ReportServerTempDB.mdf</code></li> <li><code>ReportServerTempDB_log.LDF</code></li> </ul> </blockquote> <a href="https://i.stack.imgur.com/6Yx6g.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6Yx6g.png" alt="Screenshot"></a> Try the Following link for further help. <a href="https://blog.sqlauthority.com/2017/07/05/sql-server-fix-rule-reporting-services-catalog-database-file-existence-failed/" rel="noreferrer">Reporting Services Catalog Error.</a> <hr> For <a href="/questions/tagged/sql-server-2012" class="post-tag" title="show questions tagged 'sql-server-2012'" rel="tag">sql-server-2012</a> the path is: <pre><code>C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQL2012\MSSQL\DATA </code></pre> where <code>MSSQL2012</code> is the instance name and the respective file names are: <ul> <li><code>ReportServer$MSSQL2012.mdf</code></li> <li><code>ReportServer$MSSQL2012_log.mdf</code></li> <li><code>ReportServer$MSSQL2012TempDB.mdf</code></li> <li><code>ReportServer$MSSQL2012TempDB_log.mdf</code></li> </ul>

143,020

mathematical optimization library for Java --- free or open source recommendations?

Does anyone know of such a library that performs mathematical optimization (linear programming, convex optimization, or more general types of problems)? I'm looking for something like MATLAB, but with the ability to handle larger problems. Do I have to write my own implementations, or buy one of those commercial products (CPLEX and the like)?

146,415

7

0

null

2008-09-27 04:52:44.323 UTC

10

2018-05-08 16:20:25.96 UTC

2016-02-10 16:32:55.737 UTC

null

14,167

Zach Scrivena

20,029

null

1

16

mathematical-optimization|linear-programming|cplex|gurobi|convex-optimization

18,540

A good answer is dependent on what you mean by "convex" and "more general" If you are trying to solve large or challenging linear or convex-quadratic optimization problems (especially with a discrete component to them), then it's hard to beat the main commercial solvers, <a href="http://www.gurobi.com" rel="nofollow noreferrer">gurobi</a>, <a href="http://www.ilog.com/products/cplex" rel="nofollow noreferrer">cplex</a> and <a href="http://www.dashoptimization.com/home/cgi-bin/example.pl#bcl_java" rel="nofollow noreferrer">Dash</a> unless money is a big issue for you. They all have clean JNI interfaces and are available on most major platforms. The <a href="http://www.coin-or.org" rel="nofollow noreferrer">coin-or</a> project has several optimizers and have a project for JNI interface. It is totally free (<a href="http://www.eclipse.org/legal/eplfaq.php" rel="nofollow noreferrer">EPL</a> license), but will take more work to set-up and probably not give you the same performance.

1,048,805

Compressing a directory of files with PHP

I am creating a php backup script that will dump everything from a database and save it to a file. I have been successful in doing that but now I need to take hundreds of images in a directory and compress them into one simple .tar.gz file. What is the best way to do this and how is it done? I have no idea where to start. Thanks in advance

1,048,860

7

1

null

2009-06-26 12:12:34.663 UTC

11

2021-06-08 05:04:57.617 UTC

2009-06-26 12:47:00.303 UTC

null

124,024

null

124,024

null

1

17

php|compression|backup

41,306

If you are using PHP 5.2 or later, you could use the <a href="http://us3.php.net/manual/en/book.zip.php" rel="nofollow noreferrer">Zip Library</a> and then do something along the lines of: <pre><code>$images_dir = '/path/to/images'; //this folder must be writeable by the server $backup = '/path/to/backup'; $zip_file = $backup.'/backup.zip'; if ($handle = opendir($images_dir)) { $zip = new ZipArchive(); if ($zip->open($zip_file, ZipArchive::CREATE)!==TRUE) { exit("cannot open <$zip_file>\n"); } while (false !== ($file = readdir($handle))) { $zip->addFile($images_dir.'/'.$file); echo "$file\n"; } closedir($handle); echo "numfiles: " . $zip->numFiles . "\n"; echo "status:" . $zip->status . "\n"; $zip->close(); echo 'Zip File:'.$zip_file . "\n"; } </code></pre>

325,667

How can I check if a server has ssl enable or not

Does anyone of you know, if and if so, how can I check, with my application code, if a server has ssl enabled or not?

325,833

8

3

null

2008-11-28 12:30:19.463 UTC

5

2021-10-18 09:54:50.02 UTC

2016-03-04 09:13:54.66 UTC

null

1,740,715

null

40,077

null

1

16

ssl

47,957

<a href="http://mail.python.org/pipermail/python-list/2003-May/203039.html" rel="nofollow noreferrer">"It's easier to ask forgiveness than permission"</a> For example, to read <code>stackoverflow.com</code> via SSL, don't ask whether <code>stackoverflow.com</code> supports it, just do it. In Python: <pre><code>>>> import urllib2 >>> urllib2.urlopen('https://stackoverflow.com') Traceback (most recent call last): ... urllib2.URLError: <urlopen error (10060, 'Operation timed out')> >>> html = urllib2.urlopen('http://stackoverflow.com').read() >>> len(html) 146271 >>> </code></pre> It shows that <code>stackoverflow.com</code> doesn't support SSL (2008). <hr> Update: <code>stackoverflow.com</code> supports https now.

185,235

jQuery tabs - getting newly selected index

I've previously used <a href="https://jqueryui.com/tabs/" rel="nofollow noreferrer"><code>jquery-ui tabs</code></a> extension to load page fragments via <code>ajax</code>, and to conceal or reveal hidden <code>div</code>s within a page. Both of these methods are well documented, and I've had no problems there. Now, however, I want to do something different with tabs. When the user selects a tab, it should reload the page entirely - the reason for this is that the contents of each tabbed section are somewhat expensive to render, so I don't want to just send them all at once and use the normal method of toggling 'display:none' to reveal them. My plan is to intercept the tabs' <code>select</code> event, and have that function reload the page with by manipulating document.location. How, in the <code>select</code> handler, can I get the newly selected tab index and the html LI object it corresponds to? <pre><code>$('#edit_tabs').tabs( { selected: 2, // which tab to start on when page loads select: function(e, ui) { var t = $(e.target); // alert("data is " + t.data('load.tabs')); // undef // alert("data is " + ui.data('load.tabs')); // undef // This gives a numeric index... alert( "selected is " + t.data('selected.tabs') ) // ... but it's the index of the PREVIOUSLY selected tab, not the // one the user is now choosing. return true; // eventual goal is: // ... document.location= extract-url-from(something); return false; } }); </code></pre> Is there an attribute of the event or ui object that I can read that will give the index, id, or object of the newly selected tab or the anchor tag within it? Or is there a better way altogether to use tabs to reload the entire page?

185,257

8

0

null

2008-10-08 22:51:00.71 UTC

7

2017-12-28 07:48:42.597 UTC

Adam Bellaire

2,833,516

Matt Hucke

2,554,901

null

1

26

javascript|jquery|jquery-ui|jquery-plugins|jquery-ui-tabs

69,423

I would take a look at the <a href="http://docs.jquery.com/UI/Tabs#Events" rel="noreferrer">events</a> for Tabs. The following is taken from the jQuery docs: <pre><code> $('.ui-tabs-nav').bind('tabsselect', function(event, ui) { ui.options // options used to intialize this widget ui.tab // anchor element of the selected (clicked) tab ui.panel // element, that contains the contents of the selected (clicked) tab ui.index // zero-based index of the selected (clicked) tab }); </code></pre> Looks like ui.tab is the way to go.

229,069

Dead code detection in legacy C/C++ project

How would you go about dead code detection in C/C++ code? I have a pretty large code base to work with and at least 10-15% is dead code. Is there any Unix based tool to identify this areas? Some pieces of code still use a lot of preprocessor, can automated process handle that?

229,121

8

1

null

2008-10-23 09:18:25.01 UTC

31

2017-11-01 16:08:16.053 UTC

2008-10-23 09:20:38.267 UTC

Dror Helper

11,361

Nazgob

3,579

null

1

68

c++|automation|static-analysis|legacy-code|dead-code

37,604

You could use a code coverage analysis tool for this and look for unused spots in your code. A popular tool for the gcc toolchain is gcov, together with the graphical frontend lcov (<a href="http://ltp.sourceforge.net/coverage/lcov.php" rel="noreferrer">http://ltp.sourceforge.net/coverage/lcov.php</a>). If you use gcc, you can compile with gcov support, which is enabled by the '--coverage' flag. Next, run your application or run your test suite with this gcov enabled build. Basically gcc will emit some extra files during compilation and the application will also emit some coverage data while running. You have to collect all of these (.gcdo and .gcda files). I'm not going in full detail here, but you probably need to set two environment variables to collect the coverage data in a sane way: GCOV_PREFIX and GCOV_PREFIX_STRIP... After the run, you can put all the coverage data together and run it through the lcov toolsuite. Merging of all the coverage files from different test runs is also possible, albeit a bit involved. Anyhow, you end up with a nice set of webpages showing some coverage information, pointing out the pieces of code that have no coverage and hence, were not used. Off course, you need to double check if the portions of code are not used in any situation and a lot depends on how good your tests exercise the codebase. But at least, this will give an idea about possible dead-code candidates...

1,336,791

Dictionary vs Object - which is more efficient and why?

What is more efficient in Python in terms of memory usage and CPU consumption - Dictionary or Object? Background: I have to load huge amount of data into Python. I created an object that is just a field container. Creating 4M instances and putting them into a dictionary took about 10 minutes and ~6GB of memory. After dictionary is ready, accessing it is a blink of an eye. Example: To check the performance I wrote two simple programs that do the same - one is using objects, other dictionary: Object (execution time ~18sec): <pre><code>class Obj(object): def __init__(self, i): self.i = i self.l = [] all = {} for i in range(1000000): all[i] = Obj(i) </code></pre> Dictionary (execution time ~12sec): <pre><code>all = {} for i in range(1000000): o = {} o['i'] = i o['l'] = [] all[i] = o </code></pre> Question: Am I doing something wrong or dictionary is just faster than object? If indeed dictionary performs better, can somebody explain why?

1,336,890

8

2

null

2009-08-26 18:55:45.71 UTC

52

2021-08-25 16:48:56.893 UTC

null

42,201

null

1

145

python|performance|dictionary|object

71,263

Have you tried using <code>__slots__</code>? From the <a href="https://docs.python.org/2/reference/datamodel.html#slots" rel="noreferrer">documentation</a>: <blockquote> By default, instances of both old and new-style classes have a dictionary for attribute storage. This wastes space for objects having very few instance variables. The space consumption can become acute when creating large numbers of instances. The default can be overridden by defining <code>__slots__</code> in a new-style class definition. The <code>__slots__</code> declaration takes a sequence of instance variables and reserves just enough space in each instance to hold a value for each variable. Space is saved because <code>__dict__</code> is not created for each instance. </blockquote> So does this save time as well as memory? Comparing the three approaches on my computer: test_slots.py: <pre><code>class Obj(object): __slots__ = ('i', 'l') def __init__(self, i): self.i = i self.l = [] all = {} for i in range(1000000): all[i] = Obj(i) </code></pre> test_obj.py: <pre><code>class Obj(object): def __init__(self, i): self.i = i self.l = [] all = {} for i in range(1000000): all[i] = Obj(i) </code></pre> test_dict.py: <pre><code>all = {} for i in range(1000000): o = {} o['i'] = i o['l'] = [] all[i] = o </code></pre> test_namedtuple.py (supported in 2.6): <pre><code>import collections Obj = collections.namedtuple('Obj', 'i l') all = {} for i in range(1000000): all[i] = Obj(i, []) </code></pre> Run benchmark (using CPython 2.5): <pre><code>$ lshw | grep product | head -n 1 product: Intel(R) Pentium(R) M processor 1.60GHz $ python --version Python 2.5 $ time python test_obj.py && time python test_dict.py && time python test_slots.py real 0m27.398s (using 'normal' object) real 0m16.747s (using __dict__) real 0m11.777s (using __slots__) </code></pre> Using CPython 2.6.2, including the named tuple test: <pre><code>$ python --version Python 2.6.2 $ time python test_obj.py && time python test_dict.py && time python test_slots.py && time python test_namedtuple.py real 0m27.197s (using 'normal' object) real 0m17.657s (using __dict__) real 0m12.249s (using __slots__) real 0m12.262s (using namedtuple) </code></pre> So yes (not really a surprise), using <code>__slots__</code> is a performance optimization. Using a named tuple has similar performance to <code>__slots__</code>.

1,277,278

Is there a zip-like function that pads to longest length?

Is there a built-in function that works like <a href="https://docs.python.org/3/library/functions.html#zip" rel="noreferrer"><code>zip()</code></a> but that will pad the results so that the length of the resultant list is the length of the longest input rather than the shortest input? <pre><code>>>> a = ['a1'] >>> b = ['b1', 'b2', 'b3'] >>> c = ['c1', 'c2'] >>> zip(a, b, c) [('a1', 'b1', 'c1')] >>> What command goes here? [('a1', 'b1', 'c1'), (None, 'b2', 'c2'), (None, 'b3', None)] </code></pre>

1,277,311

8

0

null

2009-08-14 11:04:09.12 UTC

38

2022-07-21 17:32:14.587 UTC

2021-03-19 23:25:02.45 UTC

null

355,230

null

116

null

1

242

python|list|zip

109,259

In Python 3 you can use <a href="https://docs.python.org/3/library/itertools.html#itertools.zip_longest" rel="noreferrer"><code>itertools.zip_longest</code></a> <pre><code>>>> list(itertools.zip_longest(a, b, c)) [('a1', 'b1', 'c1'), (None, 'b2', 'c2'), (None, 'b3', None)] </code></pre> You can pad with a different value than <code>None</code> by using the <code>fillvalue</code> parameter: <pre><code>>>> list(itertools.zip_longest(a, b, c, fillvalue='foo')) [('a1', 'b1', 'c1'), ('foo', 'b2', 'c2'), ('foo', 'b3', 'foo')] </code></pre> With Python 2 you can either use <a href="https://docs.python.org/2/library/itertools.html#itertools.izip_longest" rel="noreferrer"><code>itertools.izip_longest</code></a> (Python 2.6+), or you can use <code>map</code> with <code>None</code>. It is a little known <a href="https://docs.python.org/2/library/functions.html#map" rel="noreferrer">feature of <code>map</code></a> (but <code>map</code> changed in Python 3.x, so this only works in Python 2.x). <pre><code>>>> map(None, a, b, c) [('a1', 'b1', 'c1'), (None, 'b2', 'c2'), (None, 'b3', None)] </code></pre>

903,572

Consequences of doing "good enough" software

Does doing "good enough" software take anything from you being a programmer? Here are my thoughts on this: Well Joel Spolsky from JoelOnSoftware says that programmers gets bored because they do "good enough" (software that satisfies the requirements even though they are not that optimized). I agree, because people like to do things that are right all the way. On one side of the spectra, I want to go as far as: <ol> <li>Optimizing software in such a way as I can apply all my knowledge in Math and Computer Science I acquired in college as much as possible.</li> <li>Do all of the possible software development process say: get specs from a repository, generate the code, build, test, deploy complete with manuals in a single automated build step.</li> </ol> On the other hand, a trait to us human is that we like variety. In order to us to maintain attraction (love programming), we need to jump from one project or technology to the other in order for us to not get bored and have "fun". I would like your opinion if there is any good or bad side effects in doing "good enough" software to you as a programmer or human being?

903,609

9

0

null

2009-05-24 11:22:51.55 UTC

9

2012-03-20 14:23:28.2 UTC

null

21,234

null

77,993

null

1

11

language-agnostic

1,292

I actually consider good-enough programmers to be better than the blue-sky-make-sure-everything-is-perfect variety. That's because, although I'm a coder, I'm also a businessman and realize that programs are not for the satisfaction of programmers, they're to meet a specific business need. I actually had an argument in another question regarding the best way to detect a won tic-tac-toe/noughts-and-crosses game (an interview question). The best solution that I'd received was from a candidate that simply checked all 8 possibilities with <code>if</code> statements. There were some that gave a generalized solution which, while workable, were totally unnecessary since the specs were quite clear it was for a 3x3 board only. Many people thought I was being too restrictive and the "winning" solution was rubbish but my opinion is that it's not the job of a programmer to write perfect beautifully-extendable software. It's their job to meet a business need. If that business need allows them the freedom to do more than necessary, that's fine, but most software and fixes are delivered under time and cost constraints. Programmers (or any profession) don't work in a vacuum.

110,911

What is the closest thing to Slime for Scheme?

I do most of my development in Common Lisp, but there are some moments when I want to switch to Scheme (while reading Lisp in Small Pieces, when I want to play with continuations, or when I want to do some scripting in Gauche, for example). In such situations, my main source of discomfort is that I don't have Slime (yes, you may call me an addict). What is Scheme's closest counterpart to Slime? Specifically, I am most interested in: <ul> <li>Emacs integration (this point is obvious ;))</li> <li>Decent tab completion (ideally, c-w-c-c TAB should expand to call-with-current-continuation). It may be even symbol-table based (ie. it doesn't have to notice a function I defined in a <code>let</code> at once).</li> <li>Function argument hints in the minibuffer (if I have typed <code>(map |)</code> (cursor position is indicated by <code>|</code>)), I'd like to see <code>(map predicate . lists)</code> in the minibuffer</li> <li>Sending forms to the interpreter</li> <li>Integration with a debugger.</li> </ul> I have ordered the features by descending importance. My Scheme implementations of choice are: <ul> <li>MzScheme</li> <li>Ikarus</li> <li>Gauche</li> <li>Bigloo</li> <li>Chicken</li> </ul> It would be great if it worked at least with them.

129,009

9

1

null

2008-09-21 12:34:20.89 UTC

18

2021-09-26 14:10:59.837 UTC

2013-09-23 18:38:49.01 UTC

Ryszard Szopa

1,281,433

Ryszard Szopa

19,922

null

1

45

emacs|lisp|scheme|common-lisp|slime

14,188

You also might consider Scheme Complete: <a href="http://www.emacswiki.org/cgi-bin/wiki/SchemeComplete" rel="noreferrer">http://www.emacswiki.org/cgi-bin/wiki/SchemeComplete</a> It basically provides tab-completion.

1,110,915

Is a DIV inside a TD a bad idea?

It seems like I heard/read somewhere that a <code><div></code> inside of a <code><td></code> was a no-no. Not that it won't work, just something about them not being really compatible based on their display type. Can't find any evidence to back up my hunch, so I may be totally wrong.

1,111,197

9

0

null

2009-07-10 17:33:40.25 UTC

19

2017-12-13 07:00:32.61 UTC

2016-01-25 23:58:39.403 UTC

null

30,946

null

30,946

null

1

159

html|html-table|semantic-markup|web-standards

174,630

Using a <code>div</code> instide a <code>td</code> is not worse than any other way of using tables for layout. (Some people never use tables for layout though, and I happen to be one of them.) If you use a <code>div</code> in a <code>td</code> you will however get in a situation where it might be hard to predict how the elements will be sized. The default for a div is to determine its width from its parent, and the default for a table cell is to determine its size depending on the size of its content. The rules for how a <code>div</code> should be sized is well defined in the standards, but the rules for how a <code>td</code> should be sized is not as well defined, so different browsers use slightly different algorithms.

227,007

Resetting the time part of a timestamp in Java

In Java, given a timestamp, how to reset the time part alone to 00:00:00 so that the timestamp represents the midnight of that particular day ? In T-SQL, this query will do to achieve the same, but I don't know how to do this in Java. <code>SELECT CAST( FLOOR( CAST(GETDATE() AS FLOAT ) ) AS DATETIME) AS 'DateTimeAtMidnight';</code>

227,049

10

0

null

2008-10-22 18:28:18.63 UTC

12

2019-08-20 13:03:07.11 UTC

null

Vijay Dev

27,474

null

1

39

java|sql|timestamp

57,565

You can go Date->Calendar->set->Date: <pre><code>Date date = new Date(); // timestamp now Calendar cal = Calendar.getInstance(); // get calendar instance cal.setTime(date); // set cal to date cal.set(Calendar.HOUR_OF_DAY, 0); // set hour to midnight cal.set(Calendar.MINUTE, 0); // set minute in hour cal.set(Calendar.SECOND, 0); // set second in minute cal.set(Calendar.MILLISECOND, 0); // set millis in second Date zeroedDate = cal.getTime(); // actually computes the new Date </code></pre> I love Java dates. Note that if you're using actual java.sql.Timestamps, they have an extra nanos field. Calendar of course, knows nothing of nanos so will blindly ignore it and effectively drop it when creating the zeroedDate at the end, which you could then use to create a new Timetamp object. I should also note that Calendar is not thread-safe, so don't go thinking you can make that a static single cal instance called from multiple threads to avoid creating new Calendar instances.

1,148,309

Inverting a 4x4 matrix

I am looking for a sample code implementation on how to invert a 4x4 matrix. I know there is Gaussian eleminiation, LU decomposition, etc., but instead of looking at them in detail I am really just looking for the code to do this. Language ideally C++, data is available in array of 16 floats in column-major order.

1,148,405

10

5

null

2009-07-18 19:04:34.033 UTC

37

2021-05-18 16:09:42.353 UTC

2020-02-24 11:51:56.143 UTC

null

7,508,700

null

97,688

null

1

90

c++|algorithm|math|matrix|matrix-inverse

86,739

here: <pre><code>bool gluInvertMatrix(const double m[16], double invOut[16]) { double inv[16], det; int i; inv[0] = m[5] * m[10] * m[15] - m[5] * m[11] * m[14] - m[9] * m[6] * m[15] + m[9] * m[7] * m[14] + m[13] * m[6] * m[11] - m[13] * m[7] * m[10]; inv[4] = -m[4] * m[10] * m[15] + m[4] * m[11] * m[14] + m[8] * m[6] * m[15] - m[8] * m[7] * m[14] - m[12] * m[6] * m[11] + m[12] * m[7] * m[10]; inv[8] = m[4] * m[9] * m[15] - m[4] * m[11] * m[13] - m[8] * m[5] * m[15] + m[8] * m[7] * m[13] + m[12] * m[5] * m[11] - m[12] * m[7] * m[9]; inv[12] = -m[4] * m[9] * m[14] + m[4] * m[10] * m[13] + m[8] * m[5] * m[14] - m[8] * m[6] * m[13] - m[12] * m[5] * m[10] + m[12] * m[6] * m[9]; inv[1] = -m[1] * m[10] * m[15] + m[1] * m[11] * m[14] + m[9] * m[2] * m[15] - m[9] * m[3] * m[14] - m[13] * m[2] * m[11] + m[13] * m[3] * m[10]; inv[5] = m[0] * m[10] * m[15] - m[0] * m[11] * m[14] - m[8] * m[2] * m[15] + m[8] * m[3] * m[14] + m[12] * m[2] * m[11] - m[12] * m[3] * m[10]; inv[9] = -m[0] * m[9] * m[15] + m[0] * m[11] * m[13] + m[8] * m[1] * m[15] - m[8] * m[3] * m[13] - m[12] * m[1] * m[11] + m[12] * m[3] * m[9]; inv[13] = m[0] * m[9] * m[14] - m[0] * m[10] * m[13] - m[8] * m[1] * m[14] + m[8] * m[2] * m[13] + m[12] * m[1] * m[10] - m[12] * m[2] * m[9]; inv[2] = m[1] * m[6] * m[15] - m[1] * m[7] * m[14] - m[5] * m[2] * m[15] + m[5] * m[3] * m[14] + m[13] * m[2] * m[7] - m[13] * m[3] * m[6]; inv[6] = -m[0] * m[6] * m[15] + m[0] * m[7] * m[14] + m[4] * m[2] * m[15] - m[4] * m[3] * m[14] - m[12] * m[2] * m[7] + m[12] * m[3] * m[6]; inv[10] = m[0] * m[5] * m[15] - m[0] * m[7] * m[13] - m[4] * m[1] * m[15] + m[4] * m[3] * m[13] + m[12] * m[1] * m[7] - m[12] * m[3] * m[5]; inv[14] = -m[0] * m[5] * m[14] + m[0] * m[6] * m[13] + m[4] * m[1] * m[14] - m[4] * m[2] * m[13] - m[12] * m[1] * m[6] + m[12] * m[2] * m[5]; inv[3] = -m[1] * m[6] * m[11] + m[1] * m[7] * m[10] + m[5] * m[2] * m[11] - m[5] * m[3] * m[10] - m[9] * m[2] * m[7] + m[9] * m[3] * m[6]; inv[7] = m[0] * m[6] * m[11] - m[0] * m[7] * m[10] - m[4] * m[2] * m[11] + m[4] * m[3] * m[10] + m[8] * m[2] * m[7] - m[8] * m[3] * m[6]; inv[11] = -m[0] * m[5] * m[11] + m[0] * m[7] * m[9] + m[4] * m[1] * m[11] - m[4] * m[3] * m[9] - m[8] * m[1] * m[7] + m[8] * m[3] * m[5]; inv[15] = m[0] * m[5] * m[10] - m[0] * m[6] * m[9] - m[4] * m[1] * m[10] + m[4] * m[2] * m[9] + m[8] * m[1] * m[6] - m[8] * m[2] * m[5]; det = m[0] * inv[0] + m[1] * inv[4] + m[2] * inv[8] + m[3] * inv[12]; if (det == 0) return false; det = 1.0 / det; for (i = 0; i < 16; i++) invOut[i] = inv[i] * det; return true; } </code></pre> This was lifted from <a href="http://www.mesa3d.org/" rel="noreferrer">MESA</a> implementation of the GLU library.

508,374

What are vectors and how are they used in programming?

I'm familiar with the mathematical/physics concept of a vector as a magnitude and a direction, but I also keep coming across references to vectors in the context of programming (for example C++ seems to have a stl::vector library which comes up fairly frequently on SO). My intuition from the context has been that they're a fairly primitive construct most often used to represent something along the lines of a variable length array (storing its size as the magnitude, I presume), but it would be really helpful if somebody could provide me with a more complete explanation, preferably including how and why they're used in practice.

508,394

11

1

null

2009-02-03 18:44:06.223 UTC

18

2018-07-13 12:42:17.947 UTC

null

Lawrence Johnston

1,512

null

1

57

computer-science|vector

76,272

From <a href="http://www.cplusplus.com/reference/stl/vector/" rel="noreferrer">http://www.cplusplus.com/reference/stl/vector/</a> <blockquote> Vector containers are implemented as dynamic arrays; Just as regular arrays, vector containers have their elements stored in contiguous storage locations, which means that their elements can be accessed not only using iterators but also using offsets on regular pointers to elements. But unlike regular arrays, storage in vectors is handled automatically, allowing it to be expanded and contracted as needed. </blockquote> Furthermore, vectors can typically hold any object - so you can make a class to hold information about vehicles, and then store the fleet in a vector. Nice things about vectors, aside from resizing, is that they still allow access in constant time to individual elements via index, just like an array. The tradeoff for resizing, is that when you hit the current capacity it has to reallocate, and sometimes copy to, more memory. However most capacity increasing algorithms double the capacity each time you hit the barrier, so you never hit it more than log2(heap available) which turns out to be perhaps a dozen times in the worst case throughout program operation. -Adam