Secure FTP using Windows batch script

The built in FTP command doesn't have a facility for security. Use cUrl instead. It's scriptable, far more robust and has FTP security.

Making button go full-width?

You should add these styles to a CSS sheet

div .no-padding {
  padding:0;
}

button .full-width{
  width:100%;
  //display:block; //only if you're having issues
}

Then change add the classes to your code

<div class="span9 btn-block no-padding">
    <button class="btn btn-large btn-block btn-primary full-width" type="button">Block level button</button>
</div>

I haven't tested this and I'm not 100% sure what you want, but I think this will get you close.

What's the proper way to compare a String to an enum value?

You can do it in a simpler way , like the below:

boolean IsEqualStringandEnum (String str,Enum enum)
{
  if (str.equals(enum.toString()))
     return true;
  else
     return false;
}

Show Youtube video source into HTML5 video tag?

With the new iframe tag embedded in your website, the code will automatically detect whether you are using a browser that supports HTML5 or not.

The iframe code for embedding YouTube videos is as follows, simply copy the Video ID and replace in the code below:

<iframe type="text/html" 
    width="640" 
    height="385" 
    src="http://www.youtube.com/embed/VIDEO_ID"
    frameborder="0">
</iframe>

How to serialize Joda DateTime with Jackson JSON processor?

This has become very easy with Jackson 2.0 and the Joda module.

ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new JodaModule());

Maven dependency:

<dependency>
  <groupId>com.fasterxml.jackson.datatype</groupId>
  <artifactId>jackson-datatype-joda</artifactId>
  <version>2.1.1</version>
</dependency>

Code and documentation: https://github.com/FasterXML/jackson-datatype-joda

Binaries: http://repo1.maven.org/maven2/com/fasterxml/jackson/datatype/jackson-datatype-joda/

Elasticsearch error: cluster_block_exception [FORBIDDEN/12/index read-only / allow delete (api)], flood stage disk watermark exceeded

By default, Elasticsearch installed goes into read-only mode when you have less than 5% of free disk space. If you see errors similar to this:

Elasticsearch::Transport::Transport::Errors::Forbidden: [403] {"error":{"root_cause":[{"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"}],"type":"cluster_block_exception","reason":"blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"},"status":403}

Or in /usr/local/var/log/elasticsearch.log you can see logs similar to:

flood stage disk watermark [95%] exceeded on [nCxquc7PTxKvs6hLkfonvg][nCxquc7][/usr/local/var/lib/elasticsearch/nodes/0] free: 15.3gb[4.1%], all indices on this node will be marked read-only

Then you can fix it by running the following commands:

curl -XPUT -H "Content-Type: application/json" http://localhost:9200/_cluster/settings -d '{ "transient": { "cluster.routing.allocation.disk.threshold_enabled": false } }'
curl -XPUT -H "Content-Type: application/json" http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'

a tag as a submit button?

Try something like below

 <a href="#" onclick="this.forms['formName'].submit()">Submit</a>

Changing CSS Values with Javascript

Please! Just ask w3 (http://www.quirksmode.org/dom/w3c_css.html)! Or actually, it took me five hours... but here it is!

function css(selector, property, value) {
    for (var i=0; i<document.styleSheets.length;i++) {//Loop through all styles
        //Try add rule
        try { document.styleSheets[i].insertRule(selector+ ' {'+property+':'+value+'}', document.styleSheets[i].cssRules.length);
        } catch(err) {try { document.styleSheets[i].addRule(selector, property+':'+value);} catch(err) {}}//IE
    }
}

The function is really easy to use.. example:

<div id="box" class="boxes" onclick="css('#box', 'color', 'red')">Click Me!</div>
Or:
<div class="boxes" onmouseover="css('.boxes', 'color', 'green')">Mouseover Me!</div>
Or:
<div class="boxes" onclick="css('body', 'border', '1px solid #3cc')">Click Me!</div>

Oh..

EDIT: as @user21820 described in its answer, it might be a bit unnecessary to change all stylesheets on the page. The following script works with IE5.5 as well as latest Google Chrome, and adds only the above described css() function.

(function (scope) {
    // Create a new stylesheet in the bottom
    // of <head>, where the css rules will go
    var style = document.createElement('style');
    document.head.appendChild(style);
    var stylesheet = style.sheet;
    scope.css = function (selector, property, value) {
        // Append the rule (Major browsers)
        try { stylesheet.insertRule(selector+' {'+property+':'+value+'}', stylesheet.cssRules.length);
        } catch(err) {try { stylesheet.addRule(selector, property+':'+value); // (pre IE9)
        } catch(err) {console.log("Couldn't add style");}} // (alien browsers)
    }
})(window);

Run Button is Disabled in Android Studio

If your IDE is in power save mode, then the run button etc. are also disabled.

You can verify this via the file -> power save mode, make sure it is disabled.

Auto-center map with multiple markers in Google Maps API v3

Here's my take on this in case anyone comes across this thread:

This helps protect against non-numerical data destroying either of your final variables that determine lat and lng.

It works by taking in all of your coordinates, parsing them into separate lat and lng elements of an array, then determining the average of each. That average should be the center (and has proven true in my test cases.)

var coords = "50.0160001,3.2840073|50.014458,3.2778274|50.0169713,3.2750587|50.0180745,3.276742|50.0204038,3.2733474|50.0217796,3.2781737|50.0293064,3.2712542|50.0319918,3.2580816|50.0243287,3.2582281|50.0281447,3.2451177|50.0307925,3.2443178|50.0278165,3.2343882|50.0326574,3.2289809|50.0288569,3.2237612|50.0260081,3.2230589|50.0269495,3.2210104|50.0212645,3.2133541|50.0165868,3.1977592|50.0150515,3.1977341|50.0147901,3.1965286|50.0171915,3.1961636|50.0130074,3.1845098|50.0113267,3.1729483|50.0177206,3.1705726|50.0210692,3.1670394|50.0182166,3.158297|50.0207314,3.150927|50.0179787,3.1485753|50.0184944,3.1470782|50.0273077,3.149845|50.024227,3.1340514|50.0244172,3.1236235|50.0270676,3.1244474|50.0260853,3.1184879|50.0344525,3.113806";

var filteredtextCoordinatesArray = coords.split('|');    

    centerLatArray = [];
    centerLngArray = [];


    for (i=0 ; i < filteredtextCoordinatesArray.length ; i++) {

      var centerCoords = filteredtextCoordinatesArray[i]; 
      var centerCoordsArray = centerCoords.split(',');

      if (isNaN(Number(centerCoordsArray[0]))) {      
      } else {
        centerLatArray.push(Number(centerCoordsArray[0]));
      }

      if (isNaN(Number(centerCoordsArray[1]))) {
      } else {
        centerLngArray.push(Number(centerCoordsArray[1]));
      }                    

    }

    var centerLatSum = centerLatArray.reduce(function(a, b) { return a + b; });
    var centerLngSum = centerLngArray.reduce(function(a, b) { return a + b; });

    var centerLat = centerLatSum / filteredtextCoordinatesArray.length ; 
    var centerLng = centerLngSum / filteredtextCoordinatesArray.length ;                                    

    console.log(centerLat);
    console.log(centerLng);

    var mapOpt = {      
    zoom:8,
    center: {lat: centerLat, lng: centerLng}      
    };

How to use opencv in using Gradle?

As per OpenCV docs(1), below steps using OpenCV manager is the recommended way to use OpenCV for production runs. But, OpenCV manager(2) is an additional install from Google play store. So, if you prefer a self contained apk(not using OpenCV manager) or is currently in development/testing phase, I suggest answer at https://stackoverflow.com/a/27421494/1180117.

Recommended steps for using OpenCV in Android Studio with OpenCV manager.

Unzip OpenCV Android sdk downloaded from OpenCV.org(3)
From File -> Import Module, choose sdk/java folder in the unzipped opencv archive.
Update build.gradle under imported OpenCV module to update 4 fields to match your project's build.gradle a) compileSdkVersion b) buildToolsVersion c) minSdkVersion and 4) targetSdkVersion.
Add module dependency by Application -> Module Settings, and select the Dependencies tab. Click + icon at bottom(or right), choose Module Dependency and select the imported OpenCV module.

As the final step, in your Activity class, add snippet below.

    public class SampleJava extends Activity  {

        private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch(status) {
                case LoaderCallbackInterface.SUCCESS:
                    Log.i(TAG,"OpenCV Manager Connected");
                    //from now onwards, you can use OpenCV API
                    Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
                    break;
                case LoaderCallbackInterface.INIT_FAILED:
                    Log.i(TAG,"Init Failed");
                    break;
                case LoaderCallbackInterface.INSTALL_CANCELED:
                    Log.i(TAG,"Install Cancelled");
                    break;
                case LoaderCallbackInterface.INCOMPATIBLE_MANAGER_VERSION:
                    Log.i(TAG,"Incompatible Version");
                    break;
                case LoaderCallbackInterface.MARKET_ERROR:
                    Log.i(TAG,"Market Error");
                    break;
                default:
                    Log.i(TAG,"OpenCV Manager Install");
                    super.onManagerConnected(status);
                    break;
            }
        }
    };

    @Override
    protected void onResume() {
        super.onResume();
        //initialize OpenCV manager
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mLoaderCallback);
    }
}

Note: You could only make OpenCV calls after you receive success callback on onManagerConnected method. During run, you will be prompted for installation of OpenCV manager from play store, if it is not already installed. During development, if you don't have access to play store or is on emualtor, use appropriate OpenCV manager apk present in apk folder under downloaded OpenCV sdk archive .

Pros

Apk size reduction by around 40 MB ( consider upgrades too ).
OpenCV manager installs optimized binaries for your hardware which could help speed.
Upgrades to OpenCV manager might save your app from bugs in OpenCV.
Different apps could share same OpenCV library.

Cons

End user experience - might not like a install prompt from with your application.

How do I set the default page of my application in IIS7?

Karan has posted the answer but that didn't work for me. So, I am posting what worked for me. If that didn't work then user can try this

<configuration> 
    <system.webServer> 
        <defaultDocument enabled="true"> 
            <files> 
                <add value="myFile.aspx" /> 
            </files> 
        </defaultDocument> 
    </system.webServer>
</configuration>

SVN Repository Search

I do like TRAC - this plugin might be helpful for your task: http://trac-hacks.org/wiki/RepoSearchPlugin

jQuery selector for id starts with specific text

Let me offer a more extensive answer considering things that you haven't mentioned as yet but will find useful.

For your current problem the answer is

$("div[id^='editDialog']");

The caret (^) is taken from regular expressions and means starts with.

Solution 1

// Select elems where 'attribute' ends with 'Dialog'
$("[attribute$='Dialog']"); 

// Selects all divs where attribute is NOT equal to value    
$("div[attribute!='value']"); 

// Select all elements that have an attribute whose value is like
$("[attribute*='value']"); 

// Select all elements that have an attribute whose value has the word foobar
$("[attribute~='foobar']"); 

// Select all elements that have an attribute whose value starts with 'foo' and ends
//  with 'bar'
$("[attribute^='foo'][attribute$='bar']");

attribute in the code above can be changed to any attribute that an element may have, such as href, name, id or src.

Solution 2

Use classes

// Matches all items that have the class 'classname'
$(".className");

// Matches all divs that have the class 'classname'
$("div.className");

Solution 3

List them (also noted in previous answers)

$("#id1,#id2,#id3");

Solution 4

For when you improve, regular expression (Never actually used these, solution one has always been sufficient, but you never know!

// Matches all elements whose id takes the form editDialog-{one_or_more_integers}
$('div').filter(function () {this.id.match(/editDialog\-\d+/)});

Cannot serve WCF services in IIS on Windows 8

you can add this code to web.config in asp mvc

   <system.webServer>
    <staticContent>
      <remove fileExtension=".srt" />
      <mimeMap fileExtension=".srt" mimeType="text/srt" />
      <remove fileExtension=".vtt" />
      <mimeMap fileExtension=".vtt" mimeType="text/vtt" />
    </staticContent>
  </system.webServer>

you can change file extension with your file extension

iOS Safari – How to disable overscroll but allow scrollable divs to scroll normally?

I've work a little workarround without jquery. Not perfert but works fine (especially if you have a scroll-x in a scoll-y) https://github.com/pinadesign/overscroll/

Fell free to participate and improve it

jQuery removing '-' character from string

$mylabel.text("-123456");
var string = $mylabel.text().replace('-', '');

if you have done it that way variable string now holds "123456"

you can also (i guess the better way) do this...

$mylabel.text("-123456");
$mylabel.text(function(i,v){
   return v.replace('-','');
});

Is it fine to have foreign key as primary key?

I would not do that. I would keep the profileID as primary key of the table Profile

A foreign key is just a referential constraint between two tables

One could argue that a primary key is necessary as the target of any foreign keys which refer to it from other tables. A foreign key is a set of one or more columns in any table (not necessarily a candidate key, let alone the primary key, of that table) which may hold the value(s) found in the primary key column(s) of some other table. So we must have a primary key to match the foreign key. Or must we? The only purpose of the primary key in the primary key/foreign key pair is to provide an unambiguous join - to maintain referential integrity with respect to the "foreign" table which holds the referenced primary key. This insures that the value to which the foreign key refers will always be valid (or null, if allowed).

http://www.aisintl.com/case/primary_and_foreign_key.html

How to set label size in Bootstrap

You'll have to do 2 things to make a Bootstrap label (or anything really) adjust sizes based on screen size:

Use a media query per display size range to adjust the CSS.
Override CSS sizing set by Bootstrap. You do this by making your CSS rules more specific than Bootstrap's. By default, Bootstrap sets .label { font-size: 75% }. So any extra selector on your CSS rule will make it more specific.

Here's an example CSS listing to accomplish what you are asking, using the default 4 sizes in Bootstrap:

@media (max-width: 767) {
    /* your custom css class on a parent will increase specificity */
    /* so this rule will override Bootstrap's font size setting */
    .autosized .label { font-size: 14px; }
}

@media (min-width: 768px) and (max-width: 991px) {
    .autosized .label { font-size: 16px; }
}

@media (min-width: 992px) and (max-width: 1199px) {
    .autosized .label { font-size: 18px; }
}

@media (min-width: 1200px) {
    .autosized .label { font-size: 20px; }
}

Here is how it could be used in the HTML:

<!-- any ancestor could be set to autosized -->
<div class="autosized">
    ...
        ...
            <span class="label label-primary">Label 1</span>
</div>

Converting unix time into date-time via excel

=A1/(24*60*60) + DATE(1970;1;1) should work with seconds.

=(A1/86400/1000)+25569 if your time is in milliseconds, so dividing by 1000 gives use the correct date

Don't forget to set the type to Date on your output cell. I tried it with this date: 1504865618099 which is equal to 8-09-17 10:13.

What is setContentView(R.layout.main)?

In Android the visual design is stored in XML files and each Activity is associated to a design.

setContentView(R.layout.main)

R means Resource

layout means design

main is the xml you have created under res->layout->main.xml

Whenever you want to change the current look of an Activity or when you move from one Activity to another, the new Activity must have a design to show. We call setContentView in onCreate with the desired design as argument.

CSS Flex Box Layout: full-width row and columns

You've almost done it. However setting flex: 0 0 <basis> declaration to the columns would prevent them from growing/shrinking; And the <basis> parameter would define the width of columns.

In addition, you could use CSS3 calc() expression to specify the height of columns with the respect to the height of the header.

#productShowcaseTitle {
  flex: 0 0 100%; /* Let it fill the entire space horizontally */
  height: 100px;
}

#productShowcaseDetail,
#productShowcaseThumbnailContainer {
  height: calc(100% - 100px); /* excluding the height of the header */
}

_x000D_

#productShowcaseContainer {_x000D_
  display: flex;_x000D_
  flex-flow: row wrap;_x000D_
_x000D_
  height: 600px;_x000D_
  width: 580px;_x000D_
}_x000D_
_x000D_
#productShowcaseTitle {_x000D_
  flex: 0 0 100%; /* Let it fill the entire space horizontally */_x000D_
  height: 100px;_x000D_
  background-color: silver;_x000D_
}_x000D_
_x000D_
#productShowcaseDetail {_x000D_
  flex: 0 0 66%; /* ~ 2 * 33.33% */_x000D_
  height: calc(100% - 100px); /* excluding the height of the header */_x000D_
  background-color: lightgray;_x000D_
}_x000D_
_x000D_
#productShowcaseThumbnailContainer {_x000D_
  flex: 0 0 34%;  /* ~ 33.33% */_x000D_
  height: calc(100% - 100px); /* excluding the height of the header */_x000D_
  background-color: black;_x000D_
}

_x000D_

<div id="productShowcaseContainer">_x000D_
  <div id="productShowcaseTitle"></div>_x000D_
  <div id="productShowcaseDetail"></div>_x000D_
  <div id="productShowcaseThumbnailContainer"></div>_x000D_
</div>

_x000D_

(Vendor prefixes omitted due to brevity)

Alternatively, if you could change your markup e.g. wrapping the columns by an additional <div> element, it would be achieved without using calc() as follows:

<div class="contentContainer"> <!-- Added wrapper -->
    <div id="productShowcaseDetail"></div>
    <div id="productShowcaseThumbnailContainer"></div>
</div>

#productShowcaseContainer {
  display: flex;
  flex-direction: column;
  height: 600px; width: 580px;
}

.contentContainer { display: flex; flex: 1; }
#productShowcaseDetail { flex: 3; }
#productShowcaseThumbnailContainer { flex: 2; }

_x000D_

#productShowcaseContainer {_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
_x000D_
  height: 600px;_x000D_
  width: 580px;_x000D_
}_x000D_
_x000D_
.contentContainer {_x000D_
  display: flex;_x000D_
  flex: 1;_x000D_
}_x000D_
_x000D_
#productShowcaseTitle {_x000D_
  height: 100px;_x000D_
  background-color: silver;_x000D_
}_x000D_
_x000D_
#productShowcaseDetail {_x000D_
  flex: 3;_x000D_
  background-color: lightgray;_x000D_
}_x000D_
_x000D_
#productShowcaseThumbnailContainer {_x000D_
  flex: 2;_x000D_
  background-color: black;_x000D_
}

_x000D_

<div id="productShowcaseContainer">_x000D_
  <div id="productShowcaseTitle"></div>_x000D_
_x000D_
  <div class="contentContainer"> <!-- Added wrapper -->_x000D_
    <div id="productShowcaseDetail"></div>_x000D_
    <div id="productShowcaseThumbnailContainer"></div>_x000D_
  </div>_x000D_
</div>

_x000D_

(Vendor prefixes omitted due to brevity)

CSS: How to change colour of active navigation page menu

The CSS :active state means the active state of the clicked link - the moment when you clicked on it, but not released the mouse button yet, for example. It doesn't know which page you're on and can't apply any styles to the menu items.

To fix your problem you have to create a class and add it manually to the current page's menu:

a.active { color: #f00 }

<ul>
    <li><a href="index.php" class="active">HOME</a></li>
    <li><a href="two.php">PORTFOLIO</a></li>
    <li><a href="three.php">ABOUT</a></li>
    <li><a href="four.php">CONTACT</a></li>
    <li><a href="five.php">SHOP</a></li>
</ul>

Upload DOC or PDF using PHP

    <?php

    //create table

    /*

    --
    -- Database: `mydb`
    --

    -- --------------------------------------------------------

    --
    -- Table structure for table `tbl_user_data`
    --

    CREATE TABLE `tbl_user_data` (
      `attachment_id` int(11) NOT NULL,
      `attachment` varchar(200) NOT NULL
    ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

    --
    -- Indexes for dumped tables
    --

    --
    -- Indexes for table `tbl_user_data`
    --
    ALTER TABLE `tbl_user_data`
      ADD PRIMARY KEY (`attachment_id`);

    --
    -- AUTO_INCREMENT for dumped tables
    --

    --
    -- AUTO_INCREMENT for table `tbl_user_data`
    --
    ALTER TABLE `tbl_user_data`
      MODIFY `attachment_id` int(11) NOT NULL AUTO_INCREMENT;

      */
    $servername = "localhost";
    $username = "root";
    $password = "";
    // Create connection
    $dbname = "myDB";
    // Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    } 

    if(isset($_POST['submit'])){

      $fileName=$_FILES["resume"]["name"];
      $fileSize=$_FILES["resume"]["size"]/1024;
      $fileType=$_FILES["resume"]["type"];
      $fileTmpName=$_FILES["resume"]["tmp_name"];
      $statusMsg = '';
      $random=rand(1111,9999);
      $newFileName=$random.$fileName;

      //file upload path
      $targetDir = "resumeUpload/";
      $fileName = basename($_FILES["resume"]["name"]);
      $targetFilePath = $targetDir . $newFileName;
      $fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);

      if(!empty($_FILES["resume"]["name"])) {
          //allow certain file formats
          //$allowTypes = array('jpg','png','jpeg','gif','pdf','docx','doc');
          $allowTypes = array('pdf','docx','doc');
          if(in_array($fileType, $allowTypes)){
              //upload file to server
              if(move_uploaded_file($_FILES["resume"]["tmp_name"], $targetFilePath)){
                  $statusMsg = "The file ".$fileName. " has been uploaded.";
              }else{
                  $statusMsg = "Sorry, there was an error uploading your file.";
              }
          }else{
              $statusMsg = 'Sorry, only DOC,DOCX, & PDF files are allowed to upload.';
          }
      }else{
          $statusMsg = 'Please select a file to upload.';
      }

      //display status message
      echo $statusMsg;

      $sql="INSERT INTO `tbl_user_data` (`attachment_id`, `attachment`) VALUES
      ('NULL', '$newFileName')";

      if (mysqli_query($conn, $sql)) {

       $last_id = mysqli_insert_id($conn);
         echo "upload success";
      } else {
          echo "Error: " . $sql . "<br>" . mysqli_error($conn);
      }


    }

    ?>
    <form id="frm_upload" action="" method="post" enctype="multipart/form-data">
    Upload Resume:<input type="file" name="resume" id="resume">
    <button type="submit" name="submit">Apply  Now</button> 
    </form>

     //output sample[![check here for sample output][1]][1]

How to change row color in datagridview?

You can Change Backcolor row by row using your condition.and this function call after applying Datasource of DatagridView.

Here Is the function for that. Simply copy that and put it after Databind

private void ChangeRowColor()
{
    for (int i = 0; i < gvItem.Rows.Count; i++)
    {
        if (BindList[i].MainID == 0 && !BindList[i].SchemeID.HasValue)
            gvItem.Rows[i].DefaultCellStyle.BackColor = ColorTranslator.FromHtml("#C9CADD");
        else if (BindList[i].MainID > 0 && !BindList[i].SchemeID.HasValue)
            gvItem.Rows[i].DefaultCellStyle.BackColor = ColorTranslator.FromHtml("#DDC9C9");
        else if (BindList[i].MainID > 0)
            gvItem.Rows[i].DefaultCellStyle.BackColor = ColorTranslator.FromHtml("#D5E8D7");
        else
            gvItem.Rows[i].DefaultCellStyle.BackColor = Color.White;
    }
}

How to center content in a bootstrap column?

//add this to your css
    .myClass{
          margin 0 auto;
          }

// add the class to the span tag( could add it to the div and not using a span  
// at all
    <div class="row">
   <div class="col-xs-1 center-block">
       <span class="myClass">aaaaaaaaaaaaaaaaaaaaaaaaaaa</span>
   </div>
 </div>

How to get a variable value if variable name is stored as string?

In bash 4.3, the '-v' test for set variables was introduced. At the same time, 'nameref' declaration was added. These two features together with the indirection operator (!) enable a simplified version of the previous example:

get_value()
{
  declare -n var_name=$1
  if [[ -v var_name ]]
  then
    echo "${var_name}"
  else
    echo "variable with name <${!var_name}> is not set"
  fi
}

test=123
get_value test
123

test="\$(echo \"something nasty\")"
get_value test
$(echo "something nasty")

unset test
get_value test
variable with name <test> is not set

As this approach eliminates the need for 'eval', it is safer. This code checked under bash 5.0.3(1).

How do I convert a calendar week into a date in Excel?

The following formula is suitable for every year. You don't need to adjust it anymore. The precondition is that Monday is your first day of the week.

If A2 = Year and Week = B2
=IF(ISOWEEKNUM(DATE($A$2;1;1)-WEEKDAY(DATE($A$2;1;1);2)+1)>1;DATE($A$2;1;1)-WEEKDAY(DATE($A$2;1;1);2)+1+B2*7;DATE($A$2;1;1)-WEEKDAY(DATE($A$2;1;1);2)-6+B2*7)

How to find the users list in oracle 11g db?

select * from all_users

This will work for sure

How to limit file upload type file size in PHP?

Hope this helps :-)

if(isset($_POST['submit'])){
    ini_set("post_max_size", "30M");
    ini_set("upload_max_filesize", "30M");
    ini_set("memory_limit", "20000M"); 
    $fileName='product_demo.png';

    if($_FILES['imgproduct']['size'] > 0 && 
            (($_FILES["imgproduct"]["type"] == "image/gif") || 
                ($_FILES["imgproduct"]["type"] == "image/jpeg")|| 
                ($_FILES["imgproduct"]["type"] == "image/pjpeg") || 
                ($_FILES["imgproduct"]["type"] == "image/png") &&
                ($_FILES["imgproduct"]["size"] < 2097152))){

        if ($_FILES["imgproduct"]["error"] > 0){
            echo "Return Code: " . $_FILES["imgproduct"]["error"] . "<br />";
        } else {    
            $rnd=rand(100,999);
            $rnd=$rnd."_";
            $fileName = $rnd.trim($_FILES['imgproduct']['name']);
            $tmpName  = $_FILES['imgproduct']['tmp_name'];
            $fileSize = $_FILES['imgproduct']['size'];
            $fileType = $_FILES['imgproduct']['type'];  
            $target = "upload/";
            echo $target = $target .$rnd. basename( $_FILES['imgproduct']['name']) ; 
            move_uploaded_file($_FILES['imgproduct']['tmp_name'], $target);
        }
    } else {
        echo "Sorry, there was a problem uploading your file.";
    }
}

Access elements in json object like an array

var coordinates = [jsonObject[3][0], 
                   jsonObject[3][0],
                   jsonObject[4][1], 
                   jsonObject[4][1]];

Add onclick event to newly added element in JavaScript

cant say why, but the es5/6 syntax doesnt work

elem.onclick = (ev) => {console.log(this);} not working

elem.onclick = function(ev) {console.log(this);} working

Structure padding and packing

(The above answers explained the reason quite clearly, but seems not totally clear about the size of padding, so, I will add an answer according to what I learned from The Lost Art of Structure Packing, it has evolved to not limit to C, but also applicable to Go, Rust.)

Memory align (for struct)

Rules:

Before each individual member, there will be padding so that to make it start at an address that is divisible by its size.
e.g on 64 bit system,int should start at address divisible by 4, and long by 8, short by 2.
char and char[] are special, could be any memory address, so they don't need padding before them.
For struct, other than the alignment need for each individual member, the size of whole struct itself will be aligned to a size divisible by size of largest individual member, by padding at end.
e.g if struct's largest member is long then divisible by 8, int then by 4, short then by 2.

Order of member:

The order of member might affect actual size of struct, so take that in mind. e.g the stu_c and stu_d from example below have the same members, but in different order, and result in different size for the 2 structs.

Address in memory (for struct)

Rules:

64 bit system
Struct address starts from (n * 16) bytes. (You can see in the example below, all printed hex addresses of structs end with 0.)
Reason: the possible largest individual struct member is 16 bytes (long double).
(Update) If a struct only contains a char as member, its address could start at any address.

Empty space:

Empty space between 2 structs could be used by non-struct variables that could fit in.
e.g in test_struct_address() below, the variable x resides between adjacent struct g and h.
No matter whether x is declared, h's address won't change, x just reused the empty space that g wasted.
Similar case for y.

Example

(for 64 bit system)

memory_align.c:

/**
 * Memory align & padding - for struct.
 * compile: gcc memory_align.c
 * execute: ./a.out
 */ 
#include <stdio.h>

// size is 8, 4 + 1, then round to multiple of 4 (int's size),
struct stu_a {
    int i;
    char c;
};

// size is 16, 8 + 1, then round to multiple of 8 (long's size),
struct stu_b {
    long l;
    char c;
};

// size is 24, l need padding by 4 before it, then round to multiple of 8 (long's size),
struct stu_c {
    int i;
    long l;
    char c;
};

// size is 16, 8 + 4 + 1, then round to multiple of 8 (long's size),
struct stu_d {
    long l;
    int i;
    char c;
};

// size is 16, 8 + 4 + 1, then round to multiple of 8 (double's size),
struct stu_e {
    double d;
    int i;
    char c;
};

// size is 24, d need align to 8, then round to multiple of 8 (double's size),
struct stu_f {
    int i;
    double d;
    char c;
};

// size is 4,
struct stu_g {
    int i;
};

// size is 8,
struct stu_h {
    long l;
};

// test - padding within a single struct,
int test_struct_padding() {
    printf("%s: %ld\n", "stu_a", sizeof(struct stu_a));
    printf("%s: %ld\n", "stu_b", sizeof(struct stu_b));
    printf("%s: %ld\n", "stu_c", sizeof(struct stu_c));
    printf("%s: %ld\n", "stu_d", sizeof(struct stu_d));
    printf("%s: %ld\n", "stu_e", sizeof(struct stu_e));
    printf("%s: %ld\n", "stu_f", sizeof(struct stu_f));

    printf("%s: %ld\n", "stu_g", sizeof(struct stu_g));
    printf("%s: %ld\n", "stu_h", sizeof(struct stu_h));

    return 0;
}

// test - address of struct,
int test_struct_address() {
    printf("%s: %ld\n", "stu_g", sizeof(struct stu_g));
    printf("%s: %ld\n", "stu_h", sizeof(struct stu_h));
    printf("%s: %ld\n", "stu_f", sizeof(struct stu_f));

    struct stu_g g;
    struct stu_h h;
    struct stu_f f1;
    struct stu_f f2;
    int x = 1;
    long y = 1;

    printf("address of %s: %p\n", "g", &g);
    printf("address of %s: %p\n", "h", &h);
    printf("address of %s: %p\n", "f1", &f1);
    printf("address of %s: %p\n", "f2", &f2);
    printf("address of %s: %p\n", "x", &x);
    printf("address of %s: %p\n", "y", &y);

    // g is only 4 bytes itself, but distance to next struct is 16 bytes(on 64 bit system) or 8 bytes(on 32 bit system),
    printf("space between %s and %s: %ld\n", "g", "h", (long)(&h) - (long)(&g));

    // h is only 8 bytes itself, but distance to next struct is 16 bytes(on 64 bit system) or 8 bytes(on 32 bit system),
    printf("space between %s and %s: %ld\n", "h", "f1", (long)(&f1) - (long)(&h));

    // f1 is only 24 bytes itself, but distance to next struct is 32 bytes(on 64 bit system) or 24 bytes(on 32 bit system),
    printf("space between %s and %s: %ld\n", "f1", "f2", (long)(&f2) - (long)(&f1));

    // x is not a struct, and it reuse those empty space between struts, which exists due to padding, e.g between g & h,
    printf("space between %s and %s: %ld\n", "x", "f2", (long)(&x) - (long)(&f2));
    printf("space between %s and %s: %ld\n", "g", "x", (long)(&x) - (long)(&g));

    // y is not a struct, and it reuse those empty space between struts, which exists due to padding, e.g between h & f1,
    printf("space between %s and %s: %ld\n", "x", "y", (long)(&y) - (long)(&x));
    printf("space between %s and %s: %ld\n", "h", "y", (long)(&y) - (long)(&h));

    return 0;
}

int main(int argc, char * argv[]) {
    test_struct_padding();
    // test_struct_address();

    return 0;
}

Execution result - test_struct_padding():

stu_a: 8
stu_b: 16
stu_c: 24
stu_d: 16
stu_e: 16
stu_f: 24
stu_g: 4
stu_h: 8

Execution result - test_struct_address():

stu_g: 4
stu_h: 8
stu_f: 24
address of g: 0x7fffd63a95d0  // struct variable - address dividable by 16,
address of h: 0x7fffd63a95e0  // struct variable - address dividable by 16,
address of f1: 0x7fffd63a95f0 // struct variable - address dividable by 16,
address of f2: 0x7fffd63a9610 // struct variable - address dividable by 16,
address of x: 0x7fffd63a95dc  // non-struct variable - resides within the empty space between struct variable g & h.
address of y: 0x7fffd63a95e8  // non-struct variable - resides within the empty space between struct variable h & f1.
space between g and h: 16
space between h and f1: 16
space between f1 and f2: 32
space between x and f2: -52
space between g and x: 12
space between x and y: 12
space between h and y: 8

Thus address start for each variable is g:d0 x:dc h:e0 y:e8

IOS: verify if a point is inside a rect

In Swift that would look like this:

let point = CGPointMake(20,20)
let someFrame = CGRectMake(10,10,100,100)
let isPointInFrame = CGRectContainsPoint(someFrame, point)

Swift 3 version:

let point = CGPointMake(20,20)
let someFrame = CGRectMake(10,10,100,100)
let isPointInFrame = someFrame.contains(point)

Link to documentation . Please remember to check containment if both are in the same coordinate system if not then conversions are required (some example)

How many parameters are too many?

If I have 7-10 parameters in one routine I look at bundling them into a new class but not if that class would be nothing but a bunch of fields with getters and setters - the new class has to do something other than shuffle values in and out. Otherwise I'd rather put up with the long parameter list.

jQuery get the name of a select option

The Code is very Simple, Lets Put This Code

var name = $("#band_type_choices  option:selected").text();

Here You don't want to use $(this).find().text(), directly you can put your id name and add option:selected along with text().

This will return the result option name. Better Try this...

How to create cron job using PHP?

function _cron_exe($schedules) {
        if ($obj->get_option('cronenabledisable') == "yes") {
            // $interval = 1*20;
            $interval = $obj->get_option('cronhowtime');
            if ($obj->get_option('crontiming') == 'minutes') {
                $interval = $interval * 60;
            } else if ($obj->get_option('crontiming') == 'hours') {
                $interval = $interval * 3600;
            } else if ($obj->get_option('crontiming') == 'days') {
                $interval = $interval * 86400;
            }
            $schedules['hourlys'] = array(
                'interval' => $interval,
                'display' => 'cronjob'
            );
            return $schedules;
        }

}

Moving Panel in Visual Studio Code to right side

For Visual Studio Code v1.31.1, you can toggle the panel session via the View menu.

Go to the View Menu.
Via the Appearance option, click on Toggle Panel Position

What is AF_INET, and why do I need it?

it defines the protocols address family.this determines the type of socket created. pocket pc support AF_INET.

the content in the following page is quite decent http://etutorials.org/Programming/Pocket+pc+network+programming/Chapter+1.+Winsock/Streaming+TCP+Sockets/

How to convert CLOB to VARCHAR2 inside oracle pl/sql

ALTER TABLE TABLE_NAME ADD (COLUMN_NAME_NEW varchar2(4000 char));
update TABLE_NAME set COLUMN_NAME_NEW = COLUMN_NAME;

ALTER TABLE TABLE_NAME DROP COLUMN COLUMN_NAME;
ALTER TABLE TABLE_NAME rename column COLUMN_NAME_NEW to COLUMN_NAME;

Go install fails with error: no install location for directory xxx outside GOPATH

Careful when running

export GOPATH=$HOME

Go assume that your code exists in specific places related to GOPATH. So, instead, you can use docker to run any go command:

docker run -it -v $(pwd):/go/src/github.com/<organization name>/<repository name> golang

And now you can use any golang command, for example:

go test github.com/<organization name>/<repository name>

Select from where field not equal to Mysql Php

You can use like

NOT columnA = 'x'

columnA != 'x'

columnA <> 'x'

And like Jeffly Bake's query, for including null values, you don't have to write like

(NOT columnA = 'x' OR columnA IS NULL)

You can make it simple by

Not columnA <=> 'x'

<=> is the Null Safe equal to Operator, which includes results from even null values.

Read a text file in R line by line

Just use readLines on your file:

R> res <- readLines(system.file("DESCRIPTION", package="MASS"))
R> length(res)
[1] 27
R> res
 [1] "Package: MASS"                                                                  
 [2] "Priority: recommended"                                                          
 [3] "Version: 7.3-18"                                                                
 [4] "Date: 2012-05-28"                                                               
 [5] "Revision: $Rev: 3167 $"                                                         
 [6] "Depends: R (>= 2.14.0), grDevices, graphics, stats, utils"                      
 [7] "Suggests: lattice, nlme, nnet, survival"                                        
 [8] "Authors@R: c(person(\"Brian\", \"Ripley\", role = c(\"aut\", \"cre\", \"cph\"),"
 [9] "        email = \"[email protected]\"), person(\"Kurt\", \"Hornik\", role"  
[10] "        = \"trl\", comment = \"partial port ca 1998\"), person(\"Albrecht\","   
[11] "        \"Gebhardt\", role = \"trl\", comment = \"partial port ca 1998\"),"     
[12] "        person(\"David\", \"Firth\", role = \"ctb\"))"                          
[13] "Description: Functions and datasets to support Venables and Ripley,"            
[14] "        'Modern Applied Statistics with S' (4th edition, 2002)."                
[15] "Title: Support Functions and Datasets for Venables and Ripley's MASS"           
[16] "License: GPL-2 | GPL-3"                                                         
[17] "URL: http://www.stats.ox.ac.uk/pub/MASS4/"                                      
[18] "LazyData: yes"                                                                  
[19] "Packaged: 2012-05-28 08:47:38 UTC; ripley"                                      
[20] "Author: Brian Ripley [aut, cre, cph], Kurt Hornik [trl] (partial port"          
[21] "        ca 1998), Albrecht Gebhardt [trl] (partial port ca 1998), David"        
[22] "        Firth [ctb]"                                                            
[23] "Maintainer: Brian Ripley <[email protected]>"                               
[24] "Repository: CRAN"                                                               
[25] "Date/Publication: 2012-05-28 08:53:03"                                          
[26] "Built: R 2.15.1; x86_64-pc-mingw32; 2012-06-22 14:16:09 UTC; windows"           
[27] "Archs: i386, x64"                                                               
R>

There is an entire manual devoted to this...

Easiest way to open a download window without navigating away from the page

A small/hidden iframe can work for this purpose.

That way you don't have to worry about closing the pop up.

How to remove leading and trailing whitespace in a MySQL field?

You can use the following sql, UPDATE TABLE SET Column= replace(Column , ' ','')

How do I set the time zone of MySQL?

To set it for the current session, do:

SET time_zone = timezonename;

How to create circular ProgressBar in android?

You can try this Circle Progress library

enter image description here

NB: please always use same width and height for progress views

DonutProgress:

 <com.github.lzyzsd.circleprogress.DonutProgress
        android:id="@+id/donut_progress"
        android:layout_marginLeft="50dp"
        android:layout_width="100dp"
        android:layout_height="100dp"
        custom:circle_progress="20"/>

CircleProgress:

  <com.github.lzyzsd.circleprogress.CircleProgress
        android:id="@+id/circle_progress"
        android:layout_marginLeft="50dp"
        android:layout_width="100dp"
        android:layout_height="100dp"
        custom:circle_progress="20"/>

ArcProgress:

<com.github.lzyzsd.circleprogress.ArcProgress
        android:id="@+id/arc_progress"
        android:background="#214193"
        android:layout_marginLeft="50dp"
        android:layout_width="100dp"
        android:layout_height="100dp"
        custom:arc_progress="55"
        custom:arc_bottom_text="MEMORY"/>

Find in Files: Search all code in Team Foundation Server

We have set up a solution for Team Foundation Server Source Control (not SourceSafe as you mention) similar to what Grant suggests; scheduled TF Get, Search Server Express. However the IFilter used for C# files (text) was not giving the results we wanted, so we convert source files to .htm files. We can now add additional meta-data to the files such as:

Author (we define it as the person that last checked in the file)
Color coding (on our todo-list)
Number of changes indicating potential design problems (on our todo-list)
Integrate with the VSTS IDE like Koders SmartSearch feature
etc.

We would however prefer a protocolhandler for TFS Source Control, and a dedicated source code IFilter for a much more targeted solution.

Deleting folders in python recursively

For Linux users, you can simply run the shell command in a pythonic way

import os
os.system("rm -r /home/user/folder1  /home/user/folder2  ...")

If facing any issue then instead of rm -r use rm -rf but remember f will delete the directory forcefully.

Where rm stands for remove, -r for recursively and -rf for recursively + forcefully.

Note: It doesn't matter either the directories are empty or not, they'll get deleted.

How to plot vectors in python using matplotlib

Thanks to everyone, each of your posts helped me a lot. rbierman code was pretty straight for my question, I have modified a bit and created a function to plot vectors from given arrays. I'd love to see any suggestions to improve it further.

import numpy as np
import matplotlib.pyplot as plt
def plotv(M):
    rows,cols = M.T.shape
    print(rows,cols)

    #Get absolute maxes for axis ranges to center origin
    #This is optional
    maxes = 1.1*np.amax(abs(M), axis = 0)
    colors = ['b','r','k']
    fig = plt.figure()
    fig.suptitle('Vectors', fontsize=10, fontweight='bold')

    ax = fig.add_subplot(111)
    fig.subplots_adjust(top=0.85)
    ax.set_title('Vector operations')

    ax.set_xlabel('x')
    ax.set_ylabel('y')

    for i,l in enumerate(range(0,cols)):
        # print(i)
        plt.axes().arrow(0,0,M[i,0],M[i,1],head_width=0.2,head_length=0.1,zorder=3)

        ax.text(M[i,0],M[i,1], str(M[i]), style='italic',
            bbox={'facecolor':'red', 'alpha':0.5, 'pad':0.5})

    plt.plot(0,0,'ok') #<-- plot a black point at the origin
    # plt.axis('equal')  #<-- set the axes to the same scale
    plt.xlim([-maxes[0],maxes[0]]) #<-- set the x axis limits
    plt.ylim([-maxes[1],maxes[1]]) #<-- set the y axis limits

    plt.grid(b=True, which='major') #<-- plot grid lines
    plt.show()

r = np.random.randint(4,size=[2,2])
print(r[0,:])
print(r[1,:])
r12 = np.add(r[0,:],r[1,:])
print(r12)
plotv(np.vstack((r,r12)))

Vector addition performed on random vectors

Get string character by index - Java

if someone is strugling with kotlin, the code is:

var oldStr: String = "kotlin"
var firstChar: String = oldStr.elementAt(0).toString()
Log.d("firstChar", firstChar.toString())

this will return the char in position 1, in this case k remember, the index starts in position 0, so in this sample: kotlin would be k=position 0, o=position 1, t=position 2, l=position 3, i=position 4 and n=position 5

How to get last inserted row ID from WordPress database?

I needed to get the last id way after inserting it, so

$lastid = $wpdb->insert_id;

Was not an option.

Did the follow:

global $wpdb;
$id = $wpdb->get_var( 'SELECT id FROM ' . $wpdb->prefix . 'table' . ' ORDER BY id DESC LIMIT 1');

Parse DateTime string in JavaScript

This function handles also the invalid 29.2.2001 date.

function parseDate(str) {
    var dateParts = str.split(".");
    if (dateParts.length != 3)
        return null;
    var year = dateParts[2];
    var month = dateParts[1];
    var day = dateParts[0];

    if (isNaN(day) || isNaN(month) || isNaN(year))
        return null;

    var result = new Date(year, (month - 1), day);
    if (result == null)
        return null;
    if (result.getDate() != day)
        return null;
    if (result.getMonth() != (month - 1))
        return null;
    if (result.getFullYear() != year)
        return null;

    return result;
}

Java ArrayList - Check if list is empty

Alternatively, you may also want to check by the .size() method. The list that isn't empty will have a size more than zero

if (numbers.size()>0){
//execute your code
}

Ternary operators in JavaScript without an "else"

More often, people use logical operators to shorten the statement syntax:

!defaults.slideshowWidth &&
  (defaults.slideshowWidth = obj.find('img').width() + 'px');

But in your particular case the syntax can be even simpler:

defaults.slideshowWidth = defaults.slideshowWidth || obj.find('img').width() + 'px';

This code will return the defaults.slideshowWidth value if the defaults.slideshowWidth is evaluated to true and obj.find('img').width() + 'px' value otherwise.

See Short-Circuit Evaluation of logical operators for details.

Dropping connected users in Oracle database

I was trying to follow the flow described here - but haven't luck to completely kill the session.. Then I fond additional step here:
http://wyding.blogspot.com/2013/08/solution-for-ora-01940-cannot-drop-user.html

What I did:
1. select 'alter system kill session ''' || sid || ',' || serial# || ''';' from v$session where username = '<your_schema>'; - as described below.
Out put will be something like this:
alter system kill session '22,15' immediate;
2. alter system disconnect session '22,15' IMMEDIATE ; - 22-sid, 15-serial - repeat the command for each returned session from previous command
3. Repeat steps 1-2 while select... not return an empty table
4. Call drop user...

What was missed - call alter system disconnect session '22,15' IMMEDIATE ; for each of session returned by select 'alter system kill session '..

Find column whose name contains a specific string

Just iterate over DataFrame.columns, now this is an example in which you will end up with a list of column names that match:

import pandas as pd

data = {'spike-2': [1,2,3], 'hey spke': [4,5,6], 'spiked-in': [7,8,9], 'no': [10,11,12]}
df = pd.DataFrame(data)

spike_cols = [col for col in df.columns if 'spike' in col]
print(list(df.columns))
print(spike_cols)

Output:

['hey spke', 'no', 'spike-2', 'spiked-in']
['spike-2', 'spiked-in']

Explanation:

df.columns returns a list of column names
[col for col in df.columns if 'spike' in col] iterates over the list df.columns with the variable col and adds it to the resulting list if col contains 'spike'. This syntax is list comprehension.

If you only want the resulting data set with the columns that match you can do this:

df2 = df.filter(regex='spike')
print(df2)

Output:

   spike-2  spiked-in
0        1          7
1        2          8
2        3          9

How to navigate to a directory in C:\ with Cygwin?

You already accepted an answer, but I just thought I'd mention that the following also works in Cygwin:

cd "C:\Foo"

I think the cd /cygdrive/c method is better, but sometimes it's useful to know that you can do this too.

c# dictionary How to add multiple values for single key?

You could use my implementation of a multimap, which derives from a Dictionary<K, List<V>>. It is not perfect, however it does a good job.

/// <summary>
/// Represents a collection of keys and values.
/// Multiple values can have the same key.
/// </summary>
/// <typeparam name="TKey">Type of the keys.</typeparam>
/// <typeparam name="TValue">Type of the values.</typeparam>
public class MultiMap<TKey, TValue> : Dictionary<TKey, List<TValue>>
{

    public MultiMap()
        : base()
    {
    }

    public MultiMap(int capacity)
        : base(capacity)
    {
    }

    /// <summary>
    /// Adds an element with the specified key and value into the MultiMap. 
    /// </summary>
    /// <param name="key">The key of the element to add.</param>
    /// <param name="value">The value of the element to add.</param>
    public void Add(TKey key, TValue value)
    {
        List<TValue> valueList;

        if (TryGetValue(key, out valueList)) {
            valueList.Add(value);
        } else {
            valueList = new List<TValue>();
            valueList.Add(value);
            Add(key, valueList);
        }
    }

    /// <summary>
    /// Removes first occurence of an element with a specified key and value.
    /// </summary>
    /// <param name="key">The key of the element to remove.</param>
    /// <param name="value">The value of the element to remove.</param>
    /// <returns>true if the an element is removed;
    /// false if the key or the value were not found.</returns>
    public bool Remove(TKey key, TValue value)
    {
        List<TValue> valueList;

        if (TryGetValue(key, out valueList)) {
            if (valueList.Remove(value)) {
                if (valueList.Count == 0) {
                    Remove(key);
                }
                return true;
            }
        }
        return false;
    }

    /// <summary>
    /// Removes all occurences of elements with a specified key and value.
    /// </summary>
    /// <param name="key">The key of the elements to remove.</param>
    /// <param name="value">The value of the elements to remove.</param>
    /// <returns>Number of elements removed.</returns>
    public int RemoveAll(TKey key, TValue value)
    {
        List<TValue> valueList;
        int n = 0;

        if (TryGetValue(key, out valueList)) {
            while (valueList.Remove(value)) {
                n++;
            }
            if (valueList.Count == 0) {
                Remove(key);
            }
        }
        return n;
    }

    /// <summary>
    /// Gets the total number of values contained in the MultiMap.
    /// </summary>
    public int CountAll
    {
        get
        {
            int n = 0;

            foreach (List<TValue> valueList in Values) {
                n += valueList.Count;
            }
            return n;
        }
    }

    /// <summary>
    /// Determines whether the MultiMap contains an element with a specific
    /// key / value pair.
    /// </summary>
    /// <param name="key">Key of the element to search for.</param>
    /// <param name="value">Value of the element to search for.</param>
    /// <returns>true if the element was found; otherwise false.</returns>
    public bool Contains(TKey key, TValue value)
    {
        List<TValue> valueList;

        if (TryGetValue(key, out valueList)) {
            return valueList.Contains(value);
        }
        return false;
    }

    /// <summary>
    /// Determines whether the MultiMap contains an element with a specific value.
    /// </summary>
    /// <param name="value">Value of the element to search for.</param>
    /// <returns>true if the element was found; otherwise false.</returns>
    public bool Contains(TValue value)
    {
        foreach (List<TValue> valueList in Values) {
            if (valueList.Contains(value)) {
                return true;
            }
        }
        return false;
    }

}

Note that the Add method looks if a key is already present. If the key is new, a new list is created, the value is added to the list and the list is added to the dictionary. If the key was already present, the new value is added to the existing list.

How to detect if a browser is Chrome using jQuery?

User Endless is right,

$.browser.chrome = (typeof window.chrome === "object");

code is best to detect Chrome browser using jQuery.

If you using IE and added GoogleFrame as plugin then

var is_chrome = /chrome/.test( navigator.userAgent.toLowerCase() );

code will treat as Chrome browser because GoogleFrame plugin modifying the navigator property and adding chromeframe inside it.

Google Gson - deserialize list<class> object? (generic type)

Wep, another way to achieve the same result. We use it for its readability.

Instead of doing this hard-to-read sentence:

Type listType = new TypeToken<ArrayList<YourClass>>(){}.getType();
List<YourClass> list = new Gson().fromJson(jsonArray, listType);

Create a empty class that extends a List of your object:

public class YourClassList extends ArrayList<YourClass> {}

And use it when parsing the JSON:

List<YourClass> list = new Gson().fromJson(jsonArray, YourClassList.class);

Can't execute jar- file: "no main manifest attribute"

I was getting the same error when executing mvn package. This is how I solved the problem.

I was using the maven-multi-module. I was facing this issue because I added below part in parent pom by mistake.

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
</plugin>

Then after adding this in submodules pom.xml and removing from parent pom solved my problem.

Getting reference to the top-most view/window in iOS application

Whenever I want to display some overlay on top of everything else, I just add it on top of the Application Window directly:

[[[UIApplication sharedApplication] keyWindow] addSubview:someView]

How to access static resources when mapping a global front controller servlet on /*

I've run into this also and never found a great solution. I ended up mapping my servlet one level higher in the URL hierarchy:

<servlet-mapping>       
  <servlet-name>home</servlet-name>             
  <url-pattern>/app/*</url-pattern>     
</servlet-mapping>

And now everything at the base context (and in your /res directory) can be served up by your container.

No 'Access-Control-Allow-Origin' - Node / Apache Port Issue

Another way, is simply add the headers to your route:

router.get('/', function(req, res) {
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE'); // If needed
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type'); // If needed
    res.setHeader('Access-Control-Allow-Credentials', true); // If needed

    res.send('cors problem fixed:)');
});

How can I view an old version of a file with Git?

You can use git show with a path from the root of the repository (./ or ../ for relative pathing):

$ git show REVISION:path/to/file

Replace REVISION with your actual revision (could be a Git commit SHA, a tag name, a branch name, a relative commit name, or any other way of identifying a commit in Git)

For example, to view the version of file <repository-root>/src/main.c from 4 commits ago, use:

$ git show HEAD~4:src/main.c

Git for Windows requires forward slashes even in paths relative to the current directory. For more information, check out the man page for git-show.

Android Error Building Signed APK: keystore.jks not found for signing config 'externalOverride'

Click on choose existing and again choose the location where your jks file is located.

I hope this trick works for you.

The process cannot access the file because it is being used by another process (File is created but contains nothing)

File.AppendAllText does not know about the stream you have opened, so will internally try to open the file again. Because your stream is blocking access to the file, File.AppendAllText will fail, throwing the exception you see.

I suggest you used str.Write or str.WriteLine instead, as you already do elsewhere in your code.

Your file is created but contains nothing because the exception is thrown before str.Flush() and str.Close() are called.

Defining Z order of views of RelativeLayout in Android

childView.bringToFront() didn't work for me, so I set the Z translation of the least recently added item (the one that was overlaying all other children) to a negative value like so:

lastView.setTranslationZ(-10);

see https://developer.android.com/reference/android/view/View.html#setTranslationZ(float) for more

Loading a .json file into c# program

Another good way to serialize json into c# is below:

RootObject ro = new RootObject();
     try
    {

        StreamReader sr = new StreamReader(FileLoc);
        string jsonString = sr.ReadToEnd();
        JavaScriptSerializer ser = new JavaScriptSerializer();
        ro = ser.Deserialize<RootObject>(jsonString);


   }

you need to add a reference to system.web.extensions in .net 4.0 this is in program files (x86) > reference assemblies> framework> system.web.extensions.dll and you need to be sure you're using just regular 4.0 framework not 4.0 client

Windows ignores JAVA_HOME: how to set JDK as default?

I had the same issue. I have a bunch of Java versions installed and for some reason Java 1.7 was being used instead of Java 1.6, even though I specified in the path to use 1.6 (C:\jdk1.6.0_45_32\bin).

I had to move the path of the JDK I wanted to use (1.6) to be the first entry in the PATH environment variable to make sure Windows uses 1.6 instead of 1.7.

So, for example, the PATH environment variable before was:

C:\Program Files (x86);...<other entries>;C:\dev\ant181\bin;C:\jdk1.6.0_45_32\bin

and after I moved the jdk to be first, it worked:

C:\jdk1.6.0_45_32\bin;C:\Program Files (x86);...<other entries>;C:\dev\ant181\bin

I guess the Windows installer of Java 1.7 installed it to some other directory already in the PATH, thus getting used first instead of the specified custom PATH entry C:\jdk1.6.0_45_32\bin;

Return a value from AsyncTask in Android

How do you update Xcode on OSX to the latest version?

If attempting to download via the App Store leaves you with a little grey spinner and nothing actually happening, then you can go to :

https://developer.apple.com/download/more/

When a 'blur' event occurs, how can I find out which element focus went to?

Hmm... In Firefox, you can use explicitOriginalTarget to pull the element that was clicked on. I expected toElement to do the same for IE, but it does not appear to work... However, you can pull the newly-focused element from the document:

function showBlur(ev)
{
   var target = ev.explicitOriginalTarget||document.activeElement;
   document.getElementById("focused").value = 
      target ? target.id||target.tagName||target : '';
}

...

<button id="btn1" onblur="showBlur(event)">Button 1</button>
<button id="btn2" onblur="showBlur(event)">Button 2</button>
<button id="btn3" onblur="showBlur(event)">Button 3</button>
<input id="focused" type="text" disabled="disabled" />

Caveat: This technique does not work for focus changes caused by tabbing through fields with the keyboard, and does not work at all in Chrome or Safari. The big problem with using activeElement (except in IE) is that it is not consistently updated until after the blur event has been processed, and may have no valid value at all during processing! This can be mitigated with a variation on the technique Michiel ended up using:

function showBlur(ev)
{
  // Use timeout to delay examination of activeElement until after blur/focus 
  // events have been processed.
  setTimeout(function()
  {
    var target = document.activeElement;
    document.getElementById("focused").value = 
      target ? target.id||target.tagName||target : '';
  }, 1);
}

This should work in most modern browsers (tested in Chrome, IE, and Firefox), with the caveat that Chrome does not set focus on buttons that are clicked (vs. tabbed to).

How to open a new form from another form

ok so I used this:

public partial class Form1 : Form
{
    private void Button_Click(object sender, EventArgs e)
    {
        Form2 myForm = new Form2();
        this.Hide();
        myForm.ShowDialog();
        this.Close();
    }
}

This seems to be working fine but the first form is just hidden and it can still generate events. the "this.Close()" is needed to close the first form but if you still want your form to run (and not act like a launcher) you MUST replace it with

this.Show();

Best of luck!

How do you specify the Java compiler version in a pom.xml file?

I faced same issue in eclipse neon simple maven java project

But I add below details inside pom.xml file

   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

After right click on project > maven > update project (checked force update)

Its resolve me to display error on project

Hope it's will helpful

Thansk

Creating your own header file in C

header files contain prototypes for functions you define in a .c or .cpp/.cxx file (depending if you're using c or c++). You want to place #ifndef/#defines around your .h code so that if you include the same .h twice in different parts of your programs, the prototypes are only included once.

client.h

#ifndef CLIENT_H
#define CLIENT_H

short socketConnect(char *host,unsigned short port,char *sendbuf,char *recievebuf, long rbufsize);


#endif /** CLIENT_H */

Then you'd implement the .h in a .c file like so:

client.c

#include "client.h"

short socketConnect(char *host,unsigned short port,char *sendbuf,char *recievebuf, long rbufsize) {
 short ret = -1;
 //some implementation here
 return ret;
}

How to actually search all files in Visual Studio

One can access the "Find in Files" window via the drop-down menu selection and search all files in the Entire Solution: Edit > Find and Replace > Find in Files

Other, alternative is to open the "Find in Files" window via the "Standard Toolbars" button as highlighted in the below screen-short:

How to split a delimited string into an array in awk?

I know this is kind of old question, but I thought maybe someone like my trick. Especially since this solution not limited to a specific number of items.

# Convert to an array
_ITEMS=($(echo "12|23|11" | tr '|' '\n'))

# Output array items
for _ITEM in "${_ITEMS[@]}"; do
  echo "Item: ${_ITEM}"
done

The output will be:

Item: 12
Item: 23
Item: 11

Windows equivalent of the 'tail' command

IF you have Windows PowerShell installed (I think it's included since XP) you can just run from cmd.exe:

Head Command:

powershell -command "& {Get-Content *filename* -TotalCount *n*}"

Tail Command:

powershell -command "& {Get-Content *filename* | Select-Object -last *n*}"

or, directly from PowerShell:

Get-Content *filename* -TotalCount *n*
Get-Content *filename* | Select-Object -last *n*

update

PowerShell 3.0 (Windows 8 and higher) added Tail command with alias Last. Head and First aliases to TotalCount were also added.

So, commands can be re-written as

Get-Content *filename* -Head *n*
Get-Content *filename* -Tail *n*

How to hide action bar before activity is created, and then show it again?

I had still error with null pointer and finally it helped when I called first getWindow().requestFeature() and then super.onCreate()

public void onCreate(Bundle savedInstanceState) {
getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
super.onCreate(savedInstanceState);
getActionBar().show();

Reinitialize Slick js after successful ajax call

After calling an request, set timeout to initialize slick slider.

var options = {
    arrows: false,
    slidesToShow: 1,
    variableWidth: true,
    centerPadding: '10px'
}

$.ajax({
    type: "GET",
    url: review_url+"?page="+page,
    success: function(result){
        setTimeout(function () {
            $(".reviews-page-carousel").slick(options)
        }, 500);
    }
})

Do not initialize slick slider at start. Just initialize after an AJAX with timeout. That should work for you.

How do I obtain a list of all schemas in a Sql Server database

If you are using Sql Server Management Studio, you can obtain a list of all schemas, create your own schema or remove an existing one by browsing to:

Databases - [Your Database] - Security - Schemas

[

Does java.util.List.isEmpty() check if the list itself is null?

Yes, it will throw an Exception. maybe you are used to PHP code, where empty($element) does also check for isset($element)? In Java this is not the case.

You can memorize that easily because the method is directly called on the list (the method belongs to the list). So if there is no list, then there is no method. And Java will complain that there is no list to call this method on.

CSS Input Type Selectors - Possible to have an "or" or "not" syntax?

CSS3 has a pseudo-class called :not()

_x000D_

input:not([type='checkbox']) {    
    visibility: hidden;
}

_x000D_

<p>If <code>:not()</code> is supported, you'll only see the checkbox.</p>
                                      
<ul>
  <li>text: (<input type="text">)</li>  
  <li>password (<input type="password">)</li>       
  <li>checkbox (<input type="checkbox">)</li> 
 </ul>

_x000D_

Multiple selectors

As Vincent mentioned, it's possible to string multiple :not()s together:

input:not([type='checkbox']):not([type='submit'])

CSS4, which is supported in many of the latest browser releases, allows multiple selectors in a :not()

input:not([type='checkbox'],[type='submit'])

Legacy support

All modern browsers support the CSS3 syntax. At the time this question was asked, we needed a fall-back for IE7 and IE8. One option was to use a polyfill like IE9.js. Another was to exploit the cascade in CSS:

input {
   // styles for most inputs
}   

input[type=checkbox] {
  // revert back to the original style
} 

input.checkbox {
  // for completeness, this would have worked even in IE3!
}

How to increment an iterator by 2?

http://www.cplusplus.com/reference/std/iterator/advance/

std::advance(it,n);

where n is 2 in your case.

The beauty of this function is, that If "it" is an random access iterator, the fast

it += n

operation is used (i.e. vector<,,>::iterator). Otherwise its rendered to

for(int i = 0; i < n; i++)
    ++it;

(i.e. list<..>::iterator)

Get last field using awk substr

It should be a comment to the basename answer but I haven't enough point.

If you do not use double quotes, basename will not work with path where there is space character:

$ basename /home/foo/bar foo/bar.png
bar

ok with quotes " "

$ basename "/home/foo/bar foo/bar.png"
bar.png

file example

$ cat a
/home/parent/child 1/child 2/child 3/filename1
/home/parent/child 1/child2/filename2
/home/parent/child1/filename3

$ while read b ; do basename "$b" ; done < a
filename1
filename2
filename3

How to fix "'System.AggregateException' occurred in mscorlib.dll"

You could handle the exception directly so it would not crash your program (catching the AggregateException). You could also look at the Inner Exception, this will give you a more detailed explanation of what went wrong:

try {
    // your code 
} catch (AggregateException e) {

}

Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved

I faced the same problem and was frustrated to see as to all options i tried and none of them work,

Turns out once you have configured everything correctly including settings.xml

just clear your local repository folder and try mvn commands. That greatly helped me

Hope this helps others

Extension exists but uuid_generate_v4 fails

The extension is available but not installed in this database.

CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

internal/modules/cjs/loader.js:582 throw err

The below commands resolved the issue for me.

npm install node-gyp -g
npm install bcrypt -g

npm install bcrypt -save

Multipart File upload Spring Boot

In Controller, your method should be;

@RequestMapping(value = "/upload", method = RequestMethod.POST)
    public ResponseEntity<SaveResponse> uploadAttachment(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
....

Further, you need to update application.yml (or application.properties) to support maximum file size and request size.

spring:
    http:
        multipart:
            max-file-size: 5MB
            max-request-size: 20MB

C# "must declare a body because it is not marked abstract, extern, or partial"

You need to either provide a body for both the getter and setter, or neither. Since you have non-trivial logic in your setter, you need a manually-implemented getter like so:

get { return _hour; }

If you decide you don't need the logic in the setter, you could go with an automatically-implemented property like so:

public int Hour { get; set; }

Injecting $scope into an angular service function()

The $scope that you see being injected into controllers is not some service (like the rest of the injectable stuff), but is a Scope object. Many scope objects can be created (usually prototypically inheriting from a parent scope). The root of all scopes is the $rootScope and you can create a new child-scope using the $new() method of any scope (including the $rootScope).

The purpose of a Scope is to "glue together" the presentation and the business logic of your app. It does not make much sense to pass a $scope into a service.

Services are singleton objects used (among other things) to share data (e.g. among several controllers) and generally encapsulate reusable pieces of code (since they can be injected and offer their "services" in any part of your app that needs them: controllers, directives, filters, other services etc).

I am sure, various approaches would work for you. One is this:
Since the StudentService is in charge of dealing with student data, you can have the StudentService keep an array of students and let it "share" it with whoever might be interested (e.g. your $scope). This makes even more sense, if there are other views/controllers/filters/services that need to have access to that info (if there aren't any right now, don't be surprised if they start popping up soon).
Every time a new student is added (using the service's save() method), the service's own array of students will be updated and every other object sharing that array will get automatically updated as well.

Based on the approach described above, your code could look like this:

angular.
  module('cfd', []).

  factory('StudentService', ['$http', '$q', function ($http, $q) {
    var path = 'data/people/students.json';
    var students = [];

    // In the real app, instead of just updating the students array
    // (which will be probably already done from the controller)
    // this method should send the student data to the server and
    // wait for a response.
    // This method returns a promise to emulate what would happen 
    // when actually communicating with the server.
    var save = function (student) {
      if (student.id === null) {
        students.push(student);
      } else {
        for (var i = 0; i < students.length; i++) {
          if (students[i].id === student.id) {
            students[i] = student;
            break;
          }
        }
      }

      return $q.resolve(student);
    };

    // Populate the students array with students from the server.
    $http.get(path).then(function (response) {
      response.data.forEach(function (student) {
        students.push(student);
      });
    });

    return {
      students: students,
      save: save
    };     
  }]).

  controller('someCtrl', ['$scope', 'StudentService', 
    function ($scope, StudentService) {
      $scope.students = StudentService.students;
      $scope.saveStudent = function (student) {
        // Do some $scope-specific stuff...

        // Do the actual saving using the StudentService.
        // Once the operation is completed, the $scope's `students`
        // array will be automatically updated, since it references
        // the StudentService's `students` array.
        StudentService.save(student).then(function () {
          // Do some more $scope-specific stuff, 
          // e.g. show a notification.
        }, function (err) {
          // Handle the error.
        });
      };
    }
]);

_{One thing you should be careful about when using this approach is to never re-assign the service's array, because then any other components (e.g. scopes) will be still referencing the original array and your app will break.

E.g. to clear the array in StudentService:}

/* DON'T DO THAT   */  
var clear = function () { students = []; }

/* DO THIS INSTEAD */  
var clear = function () { students.splice(0, students.length); }

See, also, this short demo.

LITTLE UPDATE:

A few words to avoid the confusion that may arise while talking about using a service, but not creating it with the service() function.

Quoting the docs on $provide:

An Angular service is a singleton object created by a service factory. These service factories are functions which, in turn, are created by a service provider. The service providers are constructor functions. When instantiated they must contain a property called $get, which holds the service factory function.
[...]
...the $provide service has additional helper methods to register services without specifying a provider:

provider(provider) - registers a service provider with the $injector

constant(obj) - registers a value/object that can be accessed by providers and services.

value(obj) - registers a value/object that can only be accessed by services, not providers.

factory(fn) - registers a service factory function, fn, that will be wrapped in a service provider object, whose $get property will contain the given factory function.

service(class) - registers a constructor function, class that will be wrapped in a service provider object, whose $get property will instantiate a new object using the given constructor function.

Basically, what it says is that every Angular service is registered using $provide.provider(), but there are "shortcut" methods for simpler services (two of which are service() and factory()).
It all "boils down" to a service, so it doesn't make much difference which method you use (as long as the requirements for your service can be covered by that method).

BTW, provider vs service vs factory is one of the most confusing concepts for Angular new-comers, but fortunately there are plenty of resources (here on SO) to make things easier. (Just search around.)

(I hope that clears it up - let me know if it doesn't.)

Swift - encode URL

None of these answers worked for me. Our app was crashing when a url contained non-English characters.

 let unreserved = "-._~/?%$!:"
 let allowed = NSMutableCharacterSet.alphanumeric()
     allowed.addCharacters(in: unreserved)

 let escapedString = urlString.addingPercentEncoding(withAllowedCharacters: allowed as CharacterSet)

Depending on the parameters of what you are trying to do, you may want to just create your own character set. The above allows for english characters, and -._~/?%$!:

MS Access: how to compact current database in VBA

Yes it is simple to do.

Sub CompactRepair()
  Dim control As Office.CommandBarControl
  Set control = CommandBars.FindControl( Id:=2071 )
  control.accDoDefaultAction
End Sub

Basically it just finds the "Compact and repair" menuitem and clicks it, programatically.

How to link to apps on the app store

All the answers are outdated and don't work; use the below method.

All apps of a developer:
itms-apps://apps.apple.com/developer/developer-name/developerId

Single app:
itms-apps://itunes.apple.com/app/appId

What is the equivalent of the C# 'var' keyword in Java?

You can, in Java 10, but only for Local variables, meaning,

You can,

var anum = 10; var aString = "Var";

But can't,

var anull = null; // Since the type can't be inferred in this case

Check out the spec for more info.

How to install easy_install in Python 2.7.1 on Windows 7

The recommended way to install setuptools on Windows is to download ez_setup.py and run it. The script will download the appropriate .egg file and install it for you.

For best results, uninstall previous versions FIRST (see Uninstalling).

Once installation is complete, you will find an easy_install.exe program in your Python Scripts subdirectory. For simple invocation and best results, add this directory to your PATH environment variable, if it is not already present.

more details : https://pypi.python.org/pypi/setuptools

Printing long int value in C

Use printf("%ld",a);

Have a look at format specifiers for printf

Counting unique / distinct values by group in a data frame

This is a simple solution with the function aggregate:

aggregate(order_no ~ name, myvec, function(x) length(unique(x)))

Speech input for visually impaired users without the need to tap the screen

The only way to get the iOS dictation is to sign up yourself through Nuance: http://dragonmobile.nuancemobiledeveloper.com/ - it's expensive, because it's the best. Presumably, Apple's contract prevents them from exposing an API.

The built in iOS accessibility features allow immobilized users to access dictation (and other keyboard buttons) through tools like VoiceOver and Assistive Touch. It may not be worth reinventing this if your users might be familiar with these tools.

Is Java a Compiled or an Interpreted programming language ?

Java is compiled to bytecode, which then goes into the Java VM, which interprets it.

How do I replace a character at a particular index in JavaScript?

Here is a version I came up with if you want to style words or individual characters at their index in react/javascript.

replaceAt( yourArrayOfIndexes, yourString/orArrayOfStrings )

Working example: https://codesandbox.io/s/ov7zxp9mjq

function replaceAt(indexArray, [...string]) {
    const replaceValue = i => string[i] = <b>{string[i]}</b>;
    indexArray.forEach(replaceValue);
    return string;
}

And here is another alternate method

function replaceAt(indexArray, [...string]) {
    const startTag = '<b>';
    const endTag = '</b>';
    const tagLetter = i => string.splice(i, 1, startTag + string[i] + endTag);
    indexArray.forEach(tagLetter);
    return string.join('');
}

And another...

function replaceAt(indexArray, [...string]) {
    for (let i = 0; i < indexArray.length; i++) {
        string = Object.assign(string, {
          [indexArray[i]]: <b>{string[indexArray[i]]}</b>
        });
    }
    return string;
}

C++ sorting and keeping track of indexes

I wrote generic version of index sort.

template <class RAIter, class Compare>
void argsort(RAIter iterBegin, RAIter iterEnd, Compare comp, 
    std::vector<size_t>& indexes) {

    std::vector< std::pair<size_t,RAIter> > pv ;
    pv.reserve(iterEnd - iterBegin) ;

    RAIter iter ;
    size_t k ;
    for (iter = iterBegin, k = 0 ; iter != iterEnd ; iter++, k++) {
        pv.push_back( std::pair<int,RAIter>(k,iter) ) ;
    }

    std::sort(pv.begin(), pv.end(), 
        [&comp](const std::pair<size_t,RAIter>& a, const std::pair<size_t,RAIter>& b) -> bool 
        { return comp(*a.second, *b.second) ; }) ;

    indexes.resize(pv.size()) ;
    std::transform(pv.begin(), pv.end(), indexes.begin(), 
        [](const std::pair<size_t,RAIter>& a) -> size_t { return a.first ; }) ;
}

Usage is the same as that of std::sort except for an index container to receive sorted indexes. testing:

int a[] = { 3, 1, 0, 4 } ;
std::vector<size_t> indexes ;
argsort(a, a + sizeof(a) / sizeof(a[0]), std::less<int>(), indexes) ;
for (size_t i : indexes) printf("%d\n", int(i)) ;

you should get 2 1 0 3. for the compilers without c++0x support, replace the lamba expression as a class template:

template <class RAIter, class Compare> 
class PairComp {
public:
  Compare comp ;
  PairComp(Compare comp_) : comp(comp_) {}
  bool operator() (const std::pair<size_t,RAIter>& a, 
    const std::pair<size_t,RAIter>& b) const { return comp(*a.second, *b.second) ; }        
} ;

and rewrite std::sort as

std::sort(pv.begin(), pv.end(), PairComp(comp)()) ;

List of tables, db schema, dump etc using the Python sqlite3 API

Check out here for dump. It seems there is a dump function in the library sqlite3.

HTML Table different number of columns in different rows

On the realisation that you're unfamiliar with colspan, I presumed you're also unfamiliar with rowspan, so I thought I'd throw that in for free.

One important point to note, when using rowspan: the following tr elements must contain fewer td elements, because of the cells using rowspan in the previous row (or previous rows).

_x000D_

table {_x000D_
  border: 1px solid #000;_x000D_
  border-collapse: collapse;_x000D_
}_x000D_
_x000D_
th,_x000D_
td {_x000D_
  border: 1px solid #000;_x000D_
}

_x000D_

<table>_x000D_
  <thead>_x000D_
    <tr>_x000D_
      <th colspan="2">Column one and two</th>_x000D_
      <th>Column three</th>_x000D_
    </tr>_x000D_
  </thead>_x000D_
  <tbody>_x000D_
    <tr>_x000D_
      <td rowspan="2" colspan="2">A large cell</td>_x000D_
      <td>a smaller cell</td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <!-- note that this row only has _one_ td, since the preceding row_x000D_
                     takes up some of this row -->_x000D_
      <td>Another small cell</td>_x000D_
    </tr>_x000D_
  </tbody>_x000D_
</table>

_x000D_

How to get file extension from string in C++

If you happen to use Poco libraries you can do:

#include <Poco/Path.h>

...

std::string fileExt = Poco::Path("/home/user/myFile.abc").getExtension(); // == "abc"

spring PropertyPlaceholderConfigurer and context:property-placeholder

Following worked for me:
<context:property-placeholder location="file:src/resources/spring/AppController.properties"/>

Somehow "classpath:xxx" is not picking the file.

Having the output of a console application in Visual Studio instead of the console

You could create a wrapper application that you run instead of directly running your real app. The wrapper application can listen to stdout and redirect everything to Trace. Then change the run settings to launch your wrapper and pass in the path to the real app to run.

You could also have the wrapper auto-attach the debugger to the new process if a debugger is attached to the wrapper.

Store select query's output in one array in postgres

There are two ways. One is to aggregate:

SELECT array_agg(column_name::TEXT)
FROM information.schema.columns
WHERE table_name = 'aean'

The other is to use an array constructor:

SELECT ARRAY(
SELECT column_name 
FROM information.schema.columns 
WHERE table_name = 'aean')

I'm presuming this is for plpgsql. In that case you can assign it like this:

colnames := ARRAY(
SELECT column_name
FROM information.schema.columns
WHERE table_name='aean'
);

MySQL Alter Table Add Field Before or After a field already present

$query = "ALTER TABLE `" . $table_prefix . "posts_to_bookmark` 
          ADD COLUMN `ping_status` INT(1) NOT NULL 
          AFTER `<TABLE COLUMN BEFORE THIS COLUMN>`";

I believe you need to have ADD COLUMN and use AFTER, not BEFORE.

In case you want to place column at the beginning of a table, use the FIRST statement:

$query = "ALTER TABLE `" . $table_prefix . "posts_to_bookmark`
          ADD COLUMN `ping_status` INT(1) NOT NULL 
          FIRST";

http://dev.mysql.com/doc/refman/5.1/en/alter-table.html

How to capture UIView to UIImage without loss of quality on retina display

- (UIImage*)screenshotForView:(UIView *)view
{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // hack, helps w/ our colors when blurring
    NSData *imageData = UIImageJPEGRepresentation(image, 1); // convert to jpeg
    image = [UIImage imageWithData:imageData];

    return image;
}

Identifying and removing null characters in UNIX

I discovered the following, which prints out which lines, if any, have null characters:

perl -ne '/\000/ and print;' file-with-nulls

Also, an octal dump can tell you if there are nulls:

od file-with-nulls | grep ' 000'

Efficient method to generate UUID String in JAVA (UUID.randomUUID().toString() without the dashes)

Well, since an UUID gets added the hyphens (dashes) on toString() we can steal the implementation from Java's own implementation, shorting the byte array to 32 and adjusting the offset.

        public static String special() {
            UUID uuid = UUID.randomUUID();
            return fastUUID(uuid.getLeastSignificantBits(), uuid.getMostSignificantBits());
        }

        private static String fastUUID(long lsb, long msb) {
            byte[] buf = new byte[32];
            formatUnsignedLong0(lsb,        4, buf, 20, 12);
            formatUnsignedLong0(lsb >>> 48, 4, buf, 16, 4);

            formatUnsignedLong0(msb,        4, buf, 12, 4);
            formatUnsignedLong0(msb >>> 16, 4, buf, 8,  4);
            formatUnsignedLong0(msb >>> 32, 4, buf, 0,  8);

            return new String(buf, 0);
        }

        private static final char[] digits = {
                '0' , '1' , '2' , '3' , '4' , '5' ,
                '6' , '7' , '8' , '9' , 'a' , 'b' ,
                'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
                'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
                'o' , 'p' , 'q' , 'r' , 's' , 't' ,
                'u' , 'v' , 'w' , 'x' , 'y' , 'z'
        };
        private static void formatUnsignedLong0(long val, int shift, byte[] buf, int offset, int len) {
            int charPos = offset + len;
            int radix = 1 << shift;
            int mask = radix - 1;
            do {
                buf[--charPos] = (byte)digits[((int) val) & mask];
                val >>>= shift;
            } while (charPos > offset);
        }

Running it:

        public static void main(String[] args) {
            IntStream.range(0, 100).forEach(i-> {
                System.out.println(special());
            });
        }

Generates:

23f57da8a2784bb5acca553030f82e61
a14427efd8d147fdae315c1cf20fc53c
ee972aa1cf85414ca364bef5c74a7e57
6877ef35eab94b9485c5dd7c8c5a8a56
578721476629422381c0f625e22564a8
dbf60f068b5443d7bc6e5280696fed9f
dd611e870700480d81d394dd2125316c
04d71b9379ef4db49c28e113485ea76d
fd4e8cf3f85a45ae8c1b9bfe3e489a4a
858c4e8297f849b784b65b6096dec4d4
b30a8ca318a349b486b5693814422555
351c2fab9bc1426fa3bb512484628f12
9ce59e01db38405aab82d46f2a236880
5ffb5acb547a4f15a4621b406391bc0d
541b5fba8ddb4f1ebbd59cdcd5f59f7c
77f9460c4baa43a7bbaaf7f2aff205bd
85fa5254305b4c72b1b7c0103aaee269
062d45aa86694b06aad841236b839341
7a265293560f4223ab8248fda502c89b
b748c13ac45747b99aead4b0a2d7d179
cbcbf623c75d407fa3c88cfc89a90ed4
da263eed8771496faebb6290527f77fa
22231088dec04cffa40fb79ff56c6453
594a66de4b874b3491649c5d033917f6
4f6802ebd0cc4a39b25a67191c3af09d
8878b7ab8aa445cdadbef0f7c70d3deb
2c3ed0154f0c4ddbad498b7ae928b9bc
cac1dcaa80e54e2db3248987d2dbda4a
f9a3567e6dd54bf5900444c8b1c03815
f0d25d7b615a4495b51c01ab15093a88
243e45926311437c8b26cede2dc7de25
e4738c50e4cd448fbac252571c0907df
261d3593cc054569bcd645885d22c2ee
64a4796356a04cc4a09506aeb6f5b8fd
9aeebcbdde074ed69738589ca9bde0f1
ec040c956861466b84ed7f7cec601be0
18bd233781e44e7cb152800db4c4edc7
1b7b251df1244e8db46a45c186aada2b
3e32f644c9074cb3bbb15c5be1d9b95e
625309e3ffd14a90bfbd6d48142ac60e
664f0cf347ce4767add576da584526e7
fe3893fd376849fe9fed00e328e61470
254ce1441bbf4a7eae1cdf8d288e61e8
90896c6b309a49f48cc3b7a1570e1846
5f47acd1319245648098c1aec9b95f23
f798033052614b9eae8da7eba4ba3475
3471c4320e4e431eb1fa9f5eb5cb21e0
855f473fed034b1fa17f4f65b850e03b
1245de826d0d4373bdd4cf2157792954
543a8b16efca4fa2b5263315e8b21660
2dc186d699274257922853d783c0ec13
a92e6b1783db4b49a4aaa424b9e1b03f
16773feb48054cf0942a2a27204b3572
1e58da2107ac4ee39e28a93b32e1df1d
67622c19498d4178a1bab6b19087f2c2
412b6b4474fc43ccbeb1e7707b6420ee
7d0fd632913c425eb5f087600ccea870
439687baddb44852a43048b04d38427c
8b2dcc4e50464429a18b11e4aacf51a2
2fccb1c832894fe6b0b61bbdf175cd39
6d224b3d6e8747319fcf01b0309d8a0f
b4982e3b4b594cb4b334c95c2c96355e
c47fbaf90d1d4e9caf211f93b742631f
9440271e8ba6447d9a008e89a93016a6
8d24274b6a3f436a88362438aa6a221d
60452bd3f71747ed8c3706abb2235bd5
6fa93f2ee30740b89496439dd7227a4f
cc17504cf80641f882c8665ae166ba44
743efe8eac6e47a789928da4fb5b6f70
4c4d2df3461448c4a3e934cf4a7ea74f
b231eb3fb46240d38157764e8906aa7b
a234ae65f7ed48f6b1887644eed36cc2
c9cd5ed3df3f4a27957b45498f0c48ef
3eb2fbbb0a714bb7986aef3ee34f0254
d15968e605f0440c9e740e3f4e498a9f
63a8d50e8db24b91a13d4ac2fb6f7d5b
5377df9296154c57926672ca8b3c9478
a4db4a3a9d5148648a23aa7f4f77f1e0
d0aee355a2ba42de89d659385514b0fa
e92e7702481a4575a66d59c061459c5b
1b6c542d8f994d85a1312ab2cf4545ce
88e347a515474ec59013673e5402b97f
2187d9b2dc2b4d96baceade5ae99db44
4d641e69ca5b4acf90f8afe238d8a940
9c0f4c101c434831b928114c5fc0c401
140e16f6cf134785a98ae9baee5b9e7b
4dac5910f4d047e1b213c058e2230bf3
fb50a7e6333f49e4b469234426d5002f
c96c5f2fa167458eaa6d01997d90a980
1e79721e587c4a92aa55cdf8195c8c55
0da27fc5d8384ce299197b4e06cda1d4
a5e32d9cf5834e86b3fe02bc0e3104d6
2dc1826647594b1fb728de67d3df363c
0276371815254198bd22cc76f901b332
bf9d77b7b4a64e7a97ade2a62af1f8e0
268cce3249f64895b6b47e86cf296e5b
d523201fc950435f803bf89d5f042c45
607a4306b90b467f8b19c2c943bc92ef
adfa9fb63a874ca1ad746ff573f03f28
fe88132c70d141e8839ce9e7f0308750

Should be just as efficient (more effecient) than Javas actually.

Error message Strict standards: Non-static method should not be called statically in php

use className->function(); instead className::function() ;

Firebase: how to generate a unique numeric ID for key?

As the docs say, this can be achieved just by using set instead if push.

As the docs say, it is not recommended (due to possible overwrite by other user at the "same" time).

But in some cases it's helpful to have control over the feed's content including keys.

As an example of webapp in js, 193 being your id generated elsewhere, simply:

 firebase.initializeApp(firebaseConfig);
  var data={
      "name":"Prague"
  };
  firebase.database().ref().child('areas').child("193").set(data);

This will overwrite any area labeled 193 or create one if it's not existing yet.

Difference between RUN and CMD in a Dockerfile

RUN - command triggers while we build the docker image.

CMD - command triggers while we launch the created docker image.

Install Visual Studio 2013 on Windows 7

The minimum requirements are based on the Express edition you're attempting to install:

Express for Web (Web sites and HTML5 applications) - Windows 7 SP1 (With IE 10)
Express for Windows (Windows 8 Apps) - Windows 8.1
Express for Windows Desktop (Windows Programs) - Windows 7 SP1 (With IE 10)
Express for Windows Phone (Windows Phone Apps) - Windows 8

It sounds like you're trying to install the "Express 2013 for Windows" edition, which is for developing Windows 8 "Modern UI" apps, or the Windows Phone edition.

The similarly named version that is compatible with Windows 7 SP1 is "Express 2013 for Windows Desktop"

Source

The simplest possible JavaScript countdown timer?

You can easily create a timer functionality by using setInterval.Below is the code which you can use it to create the timer.

http://jsfiddle.net/ayyadurai/GXzhZ/1/

_x000D_

window.onload = function() {_x000D_
  var minute = 5;_x000D_
  var sec = 60;_x000D_
  setInterval(function() {_x000D_
    document.getElementById("timer").innerHTML = minute + " : " + sec;_x000D_
    sec--;_x000D_
    if (sec == 00) {_x000D_
      minute --;_x000D_
      sec = 60;_x000D_
      if (minute == 0) {_x000D_
        minute = 5;_x000D_
      }_x000D_
    }_x000D_
  }, 1000);_x000D_
}

_x000D_

Registration closes in <span id="timer">05:00<span> minutes!

_x000D_

How can I clear event subscriptions in C#?

The best practice to clear all subscribers is to set the someEvent to null by adding another public method if you want to expose this functionality to outside. This has no unseen consequences. The precondition is to remember to declare SomeEvent with the keyword 'event'.

Please see the book - C# 4.0 in the nutshell, page 125.

Some one here proposed to use Delegate.RemoveAll method. If you use it, the sample code could follow the below form. But it is really stupid. Why not just SomeEvent=null inside the ClearSubscribers() function?

public void ClearSubscribers ()
{
   SomeEvent = (EventHandler) Delegate.RemoveAll(SomeEvent, SomeEvent);
   // Then you will find SomeEvent is set to null.
}

WARNING: Setting property 'source' to 'org.eclipse.jst.jee.server:appname' did not find a matching property

Despite this question being rather old, I had to deal with a similar warning and wanted to share what I found out.

First of all this is a warning and not an error. So there is no need to worry too much about it. Basically it means, that Tomcat does not know what to do with the source attribute from context.

This source attribute is set by Eclipse (or to be more specific the Eclipse Web Tools Platform) to the server.xml file of Tomcat to match the running application to a project in workspace.

Tomcat generates a warning for every unknown markup in the server.xml (i.e. the source attribute) and this is the source of the warning. You can safely ignore it.

Eloquent: find() and where() usage laravel

To add to craig_h's comment above (I currently don't have enough rep to add this as a comment to his answer, sorry), if your primary key is not an integer, you'll also want to tell your model what data type it is, by setting keyType at the top of the model definition.

public $keyType = 'string'

Eloquent understands any of the types defined in the castAttribute() function, which as of Laravel 5.4 are: int, float, string, bool, object, array, collection, date and timestamp.

This will ensure that your primary key is correctly cast into the equivalent PHP data type.

My Application Could not open ServletContext resource

Make sure your maven war plugin block in pom.xml includes all files (especially xml files) while building the war. But you don't need to include the .java files though.

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-war-plugin</artifactId>
  <version>2.5</version>

  <configuration>
    <webResources>
      <resources>
        <directory>WebContent</directory>
        <includes>
          <include>**/*.*</include> <!--this line includes the xml files into the war, which will be found when it is exploded in server during deployment -->
        </includes>
        <excludes>
          <exclude>*.java</exclude>
        </excludes>
      </resources>
    </webResources>
    <webXml>WebContent/WEB-INF/web.xml</webXml>
  </configuration>
</plugin>

Windows 10 SSH keys

I finally got it to work by running opening command line with "Run a Administrator" even though I was already admin and could create directory manually

How to remove all CSS classes using jQuery/JavaScript?

Since not all versions of jQuery are created equal, you may run into the same issue I did which means calling $("#item").removeClass(); does not actually remove the class. (Probably a bug)

A more reliable method is to simply use raw JavaScript and remove the class attribute altogether.

document.getElementById("item").removeAttribute("class");

Scroll to element on click in Angular 4

I have done something like what you're asking just by using jQuery to find the element (such as document.getElementById(...)) and using the .focus() call.

In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?

WebSockets is definitely the future.

Long polling is a dirty workaround to prevent creating connections for each request like AJAX does -- but long polling was created when WebSockets didn't exist. Now due to WebSockets, long polling is going away.

WebRTC allows for peer-to-peer communication.

I recommend learning WebSockets.

Comparison:

of different communication techniques on the web

AJAX - request → response. Creates a connection to the server, sends request headers with optional data, gets a response from the server, and closes the connection. Supported in all major browsers.
Long poll - request → wait → response. Creates a connection to the server like AJAX does, but maintains a keep-alive connection open for some time (not long though). During connection, the open client can receive data from the server. The client has to reconnect periodically after the connection is closed, due to timeouts or data eof. On server side it is still treated like an HTTP request, same as AJAX, except the answer on request will happen now or some time in the future, defined by the application logic. support chart (full) | wikipedia
WebSockets - client ↔ server. Create a TCP connection to the server, and keep it open as long as needed. The server or client can easily close the connection. The client goes through an HTTP compatible handshake process. If it succeeds, then the server and client can exchange data in both directions at any time. It is efficient if the application requires frequent data exchange in both ways. WebSockets do have data framing that includes masking for each message sent from client to server, so data is simply encrypted. support chart (very good) | wikipedia
WebRTC - peer ↔ peer. Transport to establish communication between clients and is transport-agnostic, so it can use UDP, TCP or even more abstract layers. This is generally used for high volume data transfer, such as video/audio streaming, where reliability is secondary and a few frames or reduction in quality progression can be sacrificed in favour of response time and, at least, some data transfer. Both sides (peers) can push data to each other independently. While it can be used totally independent from any centralised servers, it still requires some way of exchanging endPoints data, where in most cases developers still use centralised servers to "link" peers. This is required only to exchange essential data for establishing a connection, after which a centralised server is not required. support chart (medium) | wikipedia
Server-Sent Events - client ← server. Client establishes persistent and long-term connection to server. Only the server can send data to a client. If the client wants to send data to the server, it would require the use of another technology/protocol to do so. This protocol is HTTP compatible and simple to implement in most server-side platforms. This is a preferable protocol to be used instead of Long Polling. support chart (good, except IE) | wikipedia

Advantages:

The main advantage of WebSockets server-side, is that it is not an HTTP request (after handshake), but a proper message based communication protocol. This enables you to achieve huge performance and architecture advantages. For example, in node.js, you can share the same memory for different socket connections, so they can each access shared variables. Therefore, you don't need to use a database as an exchange point in the middle (like with AJAX or Long Polling with a language like PHP). You can store data in RAM, or even republish between sockets straight away.

Security considerations

People are often concerned about the security of WebSockets. The reality is that it makes little difference or even puts WebSockets as better option. First of all, with AJAX, there is a higher chance of MITM, as each request is a new TCP connection that is traversing through internet infrastructure. With WebSockets, once it's connected it is far more challenging to intercept in between, with additionally enforced frame masking when data is streamed from client to server as well as additional compression, which requires more effort to probe data. All modern protocols support both: HTTP and HTTPS (encrypted).

P.S.

Remember that WebSockets generally have a very different approach of logic for networking, more like real-time games had all this time, and not like http.

OVER_QUERY_LIMIT in Google Maps API v3: How do I pause/delay in Javascript to slow it down?

You are using setTimeout wrong way. The (one of) function signature is setTimeout(callback, delay). So you can easily specify what code should be run after what delay.

var codeAddress = (function() {
    var index = 0;
    var delay = 100;

    function GeocodeCallback(results, status) {
        if (status == google.maps.GeocoderStatus.OK) {
            map.setCenter(results[0].geometry.location);
            new google.maps.Marker({ map: map, position: results[0].geometry.location, animation: google.maps.Animation.DROP });
            console.log(results);
        }
        else alert("Geocode was not successful for the following reason: " + status);
    };

    return function(vPostCode) {
        if (geocoder) setTimeout(geocoder.geocode.bind(geocoder, { 'address': "'" + vPostCode + "'"}, GeocodeCallback), index*delay);
        index++;
    };
})();

This way, every codeAddress() call will result in geocoder.geocode() being called 100ms later after previous call.

I also added animation to marker so you will have a nice animation effect with markers being added to map one after another. I'm not sure what is the current google limit, so you may need to increase the value of delay variable.

Also, if you are each time geocoding the same addresses, you should instead save the results of geocode to your db and next time just use those (so you will save some traffic and your application will be a little bit quicker)

How do I properly 'printf' an integer and a string in C?

scanf("%s",str) scans only until it finds a whitespace character. With the input "A 1", it will scan only the first character, hence s2 points at the garbage that happened to be in str, since that array wasn't initialised.

How to upload & Save Files with Desired name

Configure The "php.ini" File

First, ensure that PHP is configured to allow file uploads. In your "php.ini" file, search for the file_uploads directive, and set it to On:

file_uploads = On

Create The HTML Form

Next, create an HTML form that allow users to choose the image file they want to upload:

<!DOCTYPE html>
<html>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
    Select image to upload:
    <input type="file" name="fileToUpload" id="fileToUpload">
    <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>

Some rules to follow for the HTML form above: Make sure that the form uses method="post" The form also needs the following attribute: enctype="multipart/form-data". It specifies which content-type to use when submitting the form Without the requirements above, the file upload will not work. Other things to notice: The type="file" attribute of the tag shows the input field as a file-select control, with a "Browse" button next to the input control The form above sends data to a file called "upload.php", which we will create next.

Create The Upload File PHP Script

The "upload.php" file contains the code for uploading a file:

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}
?>

json_encode is returning NULL?

You should pass utf8 encoded string in json_encode. You can use utf8_encode and array_map() function like below:

<?php
    $encoded_rows = array_map('utf8_encode', $rows);
    echo json_encode($encoded_rows);
?>

Add & delete view from Layout

Great anwser from Sameer and Abel Terefe. However, when you remove a view, in my option, you want to remove a view with certain id. Here is how do you do that.

1, give the view an id when you create it:

_textView.setId(index);

2, remove the view with the id:

removeView(findViewById(index));

R - do I need to add explicit new line character with print()?

Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' with pdo

For anyone coming along later, like I did, and seeing this...

I was receiving the same error because I did not have the extension "enabled" in my php.ini file. I would imagine you might also get this error if you have recently upgraded your php version and did not properly update your php.ini file.

If you are receiving this error shortly after upgrading your php version, the info below might help you out:

PHP 7.4 slightly changed its syntax in the php.ini file. Now, to enable the mysql pdo, make sure extension=pdo_mysql is uncommented in your php.ini file. (line 931 in the default php.ini setup)

The line used to be:

extension=php_pdo_mysql.dll on Windows

extension=php_pdo_mysql.so on Linux/Mac

as Sk8erPeter pointed out. but the .dll and .so endings are to be deprecated and so it is best practice to begin getting rid of those endings and using just extension=<ext>

The below is pulled from the default php.ini-production file from the php 7.4 zip download under "Dynamic Extensions":

Note : The syntax used in previous PHP versions ('extension=.so' and 'extension='php_.dll') is supported for legacy reasons and may be deprecated in a future PHP major version. So, when it is possible, please move to the new (extension=<ext>) syntax.

Git push rejected after feature branch rebase

What is wrong with a git merge master on the feature branch? This will preserve the work you had, while keeping it separate from the mainline branch.

A--B--C------F--G
       \         \
        D--E------H

Edit: Ah sorry did not read your problem statement. You will need force as you performed a rebase. All commands that modify the history will need the --force argument. This is a failsafe to prevent you from losing work (the old D and E would be lost).

So you performed a git rebase which made the tree look like (although partially hidden as D and E are no longer in a named branch):

A--B--C------F--G
       \         \
        D--E      D'--E'

So, when trying to push your new feature branch (with D' and E' in it), you would lose D and E.

Remove non-ascii character in string

None of these answers properly handle tabs, newlines, carriage returns, and some don't handle extended ASCII and unicode. This will KEEP tabs & newlines, but remove control characters and anything out of the ASCII set. Click "Run this code snippet" button to test. There is some new javascript coming down the pipe so in the future (2020+?) you may have to do \u{FFFFF} but not yet

_x000D_

console.log("line 1\nline2 \n\ttabbed\nF??^?¯?^??????????????l????~¨??????_??????a?????"????????????v?¯?????i????o?????????????????????".replace(/[\x00-\x08\x0E-\x1F\x7F-\uFFFF]/g, ''))

_x000D_

MySQL Query - Records between Today and Last 30 Days

You can also write this in mysql -

SELECT  DATE_FORMAT(create_date, '%m/%d/%Y')
FROM    mytable
WHERE   create_date < DATE_ADD(NOW(), INTERVAL -1 MONTH);

FIXED

How to replace a whole line with sed?

If you would like to use awk then this would work too

awk -F= '{$2="xxx";print}' OFS="\=" filename

Angular 4 default radio button checked by default

You can use [(ngModel)], but you'll need to update your value to [value] otherwise the value is evaluating as a string. It would look like this:

<label>This rule is true if:</label>
<label class="form-check-inline">
    <input class="form-check-input" type="radio" name="mode" [value]="true" [(ngModel)]="rule.mode">
</label>
<label class="form-check-inline">
    <input class="form-check-input" type="radio" name="mode" [value]="false" [(ngModel)]="rule.mode">
</label>

If rule.mode is true, then that radio is selected. If it's false, then the other.

The difference really comes down to the value. value="true" really evaluates to the string 'true', whereas [value]="true" evaluates to the boolean true.

Bubble Sort Homework

def merge_bubble(arr):
    k = len(arr)
    while k>2:
        for i in range(0,k-1):
            for j in range(0,k-1):
                if arr[j] > arr[j+1]:
                    arr[j],arr[j+1] = arr[j+1],arr[j]

        return arr
        break
    else:
        if arr[0] > arr[1]:
            arr[0],arr[1] = arr[1],arr[0]
        return arr

What is the difference between instanceof and Class.isAssignableFrom(...)?

isAssignableFrom(A, B) =

if (A == B) return true
else if (B == java.lang.Object) return false
else return isAssignableFrom(A, getSuperClass(B))

The pseudo code above is a definition of, if references of type/class A is assignable from references of type/class B. It is a recursive definition. To some it may be helpful, for others it may be confusing. I add it in case somebody should find it useful. This is just an attempt to capture my understanding, it is not the official definition. It is used in a certain Java VM implementation and works for many example programs, so while I cannot guarentee that it captures all aspects of isAssignableFrom, it is not completely off.

Need table of key codes for android and presenter

You can find a complete list of Key Codes and an explanation here: http://code.google.com/p/androhid/wiki/Keycodes

MySQL > Table doesn't exist. But it does (or it should)

I had the same problem and I searched for 2-3 days, but the solution for me was really stupid.

Restart the mysql

$ sudo service mysql restart

Now tables become accessible.

How do you format code in Visual Studio Code (VSCode)

Formatting code in Visual Studio.

I have tried to format in Windows 8.

Just follow the screenshots below.

Click on View on the top menu bar, and then click on Command Palette.
Then a textbox would appear where we need type Format

Shift + Alt + F

How do I split an int into its digits?

A simple answer to this question can be:

Read A Number "n" From The User.
Using While Loop Make Sure Its Not Zero.
Take modulus 10 Of The Number "n"..This Will Give You Its Last Digit.
Then Divide The Number "n" By 10..This Removes The Last Digit of Number "n" since in int decimal part is omitted.
Display Out The Number.

I Think It Will Help. I Used Simple Code Like:

#include <iostream>
using namespace std;
int main()
{int n,r;

    cout<<"Enter Your Number:";
    cin>>n;


    while(n!=0)
    {
               r=n%10;
               n=n/10;

               cout<<r;
    }
    cout<<endl;

    system("PAUSE");
    return 0;
}

What is the difference between DAO and Repository patterns?

Repository is more abstract domain oriented term that is part of Domain Driven Design, it is part of your domain design and a common language, DAO is a technical abstraction for data access technology, repository is concerns only with managing existing data and factories for creation of data.

check these links:

http://warren.mayocchi.com/2006/07/27/repository-or-dao/ http://fabiomaulo.blogspot.com/2009/09/repository-or-dao-repository.html

How to open child forms positioned within MDI parent in VB.NET?

Try Making the Child Form's StartPosition Property set to Center Parent. This you can select from the form Properties.

How can I check if a string only contains letters in Python?

You can leverage regular expressions.

>>> import re
>>> pattern = re.compile("^[a-zA-Z]+$")
>>> pattern.match("hello")
<_sre.SRE_Match object; span=(0, 5), match='hello'>
>>> pattern.match("hel7lo")
>>>

The match() method will return a Match object if a match is found. Otherwise it will return None.

An easier approach is to use the .isalpha() method

>>> "Hello".isalpha()
True
>>> "Hel7lo".isalpha()
False

isalpha() returns true if there is at least 1 character in the string and if all the characters in the string are alphabets.

Read whole ASCII file into C++ std::string

I don't think you can do this without an explicit or implicit loop, without reading into a char array (or some other container) first and ten constructing the string. If you don't need the other capabilities of a string, it could be done with vector<char> the same way you are currently using a char *.

'uint32_t' does not name a type

I had tha same problem trying to compile a lib I download from the internet. In my case, there was already a #include <cstdint> in the code. I solved it adding a:

using std::uint32_t;

Setting Oracle 11g Session Timeout

This is likely caused by your application's connection pool; not an Oracle DBMS issue. Most connection pools have a validate statement that can execute before giving you the connection. In oracle you would want "Select 1 from dual".

The reason it started occurring after you restarted the server is that the connection pool was probably added without a restart and you are just now experiencing the use of the connection pool for the first time. What is the modification dates on your resource files that deal with database connections?

Validate Query example:

 <Resource name="jdbc/EmployeeDB" auth="Container" 
            validationQuery="Select 1 from dual" type="javax.sql.DataSource" username="dbusername" password="dbpassword"
            driverClassName="org.hsql.jdbcDriver" url="jdbc:HypersonicSQL:database"
            maxActive="8" maxIdle="4"/>

EDIT: In the case of Grails, there are similar configuration options for the grails pool. Example for Grails 1.2 (see release notes for Grails 1.2)

dataSource {
    pooled = true
    dbCreate = "update"
    url = "jdbc:mysql://localhost/yourDB"
    driverClassName = "com.mysql.jdbc.Driver"
    username = "yourUser"
    password = "yourPassword"
    properties {
        maxActive = 50
        maxIdle = 25
        minIdle = 5
        initialSize = 5
        minEvictableIdleTimeMillis = 60000
        timeBetweenEvictionRunsMillis = 60000
        maxWait = 10000     
    }   
}

Converting Long to Date in Java returns 1970

1220227200 corresponds to Jan 15 1980 (and indeed new Date(1220227200).toString() returns "Thu Jan 15 03:57:07 CET 1970"). If you pass a long value to a date, that is before 01/01/1970 it will in fact return a date of 01/01/1970. Make sure that your values are not in this situation (lower than 82800000).

Get values from an object in JavaScript

If you want to do this in a single line, try:

Object.keys(a).map(function(key){return a[key]})

Best lightweight web server (only static content) for Windows

I played a bit with Rupy. It's a pretty neat, open source (GPL) Java application and weighs less than 60KB. Give it a try!

PHP, How to get current date in certain format

date("Y-m-d H:i:s"); // This should do it.

Format Date as "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"

function converToLocalTime(serverDate) {

    var dt = new Date(Date.parse(serverDate));
    var localDate = dt;
    
    var gmt = localDate;
        var min = gmt.getTime() / 1000 / 60; // convert gmt date to minutes
        var localNow = new Date().getTimezoneOffset(); // get the timezone
        // offset in minutes
        var localTime = min - localNow; // get the local time

    var dateStr = new Date(localTime * 1000 * 60);
    // dateStr = dateStr.toISOString("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); // this will return as just the server date format i.e., yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
    dateStr = dateStr.toString("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    return dateStr;
}

How to call a method defined in an AngularJS directive?

TESTED Hope this helps someone.

My simple approach (Think tags as your original code)

<html>
<div ng-click="myfuncion"> 
<my-dir callfunction="myfunction">
</html>

<directive "my-dir">
callfunction:"=callfunction"
link : function(scope,element,attr) {
scope.callfunction = function() {
 /// your code
}
}
</directive>

How do I get total physical memory size using PowerShell without WMI?

If you don't want to use WMI, I can suggest systeminfo.exe. But, there may be a better way to do that.

(systeminfo | Select-String 'Total Physical Memory:').ToString().Split(':')[1].Trim()

Best way to return a value from a python script

If you want your script to return values, just do return [1,2,3] from a function wrapping your code but then you'd have to import your script from another script to even have any use for that information:

Return values (from a wrapping-function)

(again, this would have to be run by a separate Python script and be imported in order to even do any good):

import ...
def main():
    # calculate stuff
    return [1,2,3]

Exit codes as indicators

(This is generally just good for when you want to indicate to a governor what went wrong or simply the number of bugs/rows counted or w/e. Normally 0 is a good exit and >=1 is a bad exit but you could inter-prate them in any way you want to get data out of it)

import sys
# calculate and stuff
sys.exit(100)

And exit with a specific exit code depending on what you want that to tell your governor. I used exit codes when running script by a scheduling and monitoring environment to indicate what has happened.

(os._exit(100) also works, and is a bit more forceful)

Stdout as your relay

If not you'd have to use stdout to communicate with the outside world (like you've described). But that's generally a bad idea unless it's a parser executing your script and can catch whatever it is you're reporting to.

import sys
# calculate stuff
sys.stdout.write('Bugs: 5|Other: 10\n')
sys.stdout.flush()
sys.exit(0)

Are you running your script in a controlled scheduling environment then exit codes are the best way to go.

Files as conveyors

There's also the option to simply write information to a file, and store the result there.

# calculate
with open('finish.txt', 'wb') as fh:
    fh.write(str(5)+'\n')

And pick up the value/result from there. You could even do it in a CSV format for others to read simplistically.

Sockets as conveyors

If none of the above work, you can also use network sockets locally *(unix sockets is a great way on nix systems). These are a bit more intricate and deserve their own post/answer. But editing to add it here as it's a good option to communicate between processes. Especially if they should run multiple tasks and return values.

How do I capture SIGINT in Python?

If you want to ensure that your cleanup process finishes I would add on to Matt J's answer by using a SIG_IGN so that further SIGINT are ignored which will prevent your cleanup from being interrupted.

import signal
import sys

def signal_handler(signum, frame):
    signal.signal(signum, signal.SIG_IGN) # ignore additional signals
    cleanup() # give your process a chance to clean up
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler) # register the signal with the signal handler first
do_stuff()

How do I get first element rather than using [0] in jQuery?

$("#grid_GridHeader:first") works as well.

How do you validate a URL with a regular expression in Python?

urlfinders = [
    re.compile("([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}|(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp)[-A-Za-z0-9]*\\.)[-A-Za-z0-9\\.]+)(:[0-9]*)?/[-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]*[^]'\\.}>\\),\\\"]"),
    re.compile("([0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}|(((news|telnet|nttp|file|http|ftp|https)://)|(www|ftp)[-A-Za-z0-9]*\\.)[-A-Za-z0-9\\.]+)(:[0-9]*)?"),
    re.compile("(~/|/|\\./)([-A-Za-z0-9_\\$\\.\\+\\!\\*\\(\\),;:@&=\\?/~\\#\\%]|\\\\
)+"),
    re.compile("'\\<((mailto:)|)[-A-Za-z0-9\\.]+@[-A-Za-z0-9\\.]+"),
]

NOTE: As ugly as it looks in your browser just copy paste and the formatting should be good

Found at the python mailing lists and used for the gnome-terminal

source: http://mail.python.org/pipermail/python-list/2007-January/595436.html

Required maven dependencies for Apache POI to work

There are multiple jars which are required for your APACHE POI to work with your application.

List of JAR file:-

poi-4.1.0
poi-ooxml-4.1.0
commons-collections4-4.3
commons-compress-1.18
xmlbeans-3.1.0
poi-ooxml-schemas-3.9
dom4j-1.6.1

What is the difference between ( for... in ) and ( for... of ) statements?

for in loops over enumerable property names of an object.

for of (new in ES6) does use an object-specific iterator and loops over the values generated by that.

In your example, the array iterator does yield all the values in the array (ignoring non-index properties).

How do you use global variables or constant values in Ruby?

I think it's local to the file you declared offset. Consider every file to be a method itself.

Maybe put the whole thing into a class and then make offset a class variable with @@offset = Point.new(100, 200);?

Seedable JavaScript random number generator

If you want to be able to specify the seed, you just need to replace the calls to getSeconds() and getMinutes(). You could pass in an int and use half of it mod 60 for the seconds value and the other half modulo 60 to give you the other part.

That being said, this method looks like garbage. Doing proper random number generation is very hard. The obvious problem with this is that the random number seed is based on seconds and minutes. To guess the seed and recreate your stream of random numbers only requires trying 3600 different second and minute combinations. It also means that there are only 3600 different possible seeds. This is correctable, but I'd be suspicious of this RNG from the start.

If you want to use a better RNG, try the Mersenne Twister. It is a well tested and fairly robust RNG with a huge orbit and excellent performance.

EDIT: I really should be correct and refer to this as a Pseudo Random Number Generator or PRNG.

"Anyone who uses arithmetic methods to produce random numbers is in a state of sin."
--- John von Neumann

How to create a button programmatically?

    // UILabel:
    let label = UILabel()
    label.frame = CGRectMake(35, 100, 250, 30)
    label.textColor = UIColor.blackColor()
    label.textAlignment = NSTextAlignment.Center
    label.text = "Hello World"
    self.view.addSubview(label)

    // UIButton:
    let btn: UIButton = UIButton(type: UIButtonType.Custom) as UIButton
    btn.frame = CGRectMake(130, 70, 60, 20)
    btn.setTitle("Click", forState: UIControlState.Normal)
    btn.setTitleColor(UIColor.blackColor(), forState: .Normal)
    btn.addTarget(self, action:Selector("clickAction"), forControlEvents: UIControlEvents.TouchUpInside)
    view.addSubview(btn)


    // Button Action:
    @IBAction func clickAction(sender:AnyObject)
    {
        print("Click Action")
    }

How to call any method asynchronously in c#

Starting with .Net 4.5 you can use Task.Run to simply start an action:

void Foo(string args){}
...
Task.Run(() => Foo("bar"));

Task.Run vs Task.Factory.StartNew

Apache VirtualHost and localhost

For someone doing everything described here and still can't access:

XAMPP with Apache HTTP Server 2.4:

In file httpd-vhost.conf:

<VirtualHost *>
    DocumentRoot "D:/xampp/htdocs/dir"
    ServerName something.dev
   <Directory "D:/xampp/htdocs/dir">
    Require all granted #apache v 2.4.4 uses just this
   </Directory>
</VirtualHost>

There isn't any need for a port, or an IP address here. Apache configures it on its own files. There isn't any need for NameVirtualHost *:80; it's deprecated. You can use it, but it doesn't make any difference.

Then to edit hosts, you must run Notepad as administrator (described bellow). If you were editing the file without doing this, you are editing a pseudo file, not the original (yes, it saves, etc., but it's not the real file)

In Windows:

Find the Notepad icon, right click, run as administrator, open file, go to C:/WINDOWS/system32/driver/etc/hosts, check "See all files", and open hosts.

If you where editing it before, probably you will see it's not the file you were previously editing when not running as administrator.

Then to check if Apache is reading your httpd-vhost.conf, go to folder xampFolder/apache/bin, Shift + right click, open a terminal command here, open XAMPP (as you usually do), start Apache, and then on the command line, type httpd -S. You will see a list of the virtual hosts. Just check if your something.dev is there.

Using HTTPS with REST in Java

Something to keep in mind is that this error isn't only due to self signed certs. The new Entrust CA certs fail with the same error, and the right thing to do is to update the server with the appropriate root certs, not to disable this important security feature.

Volatile Vs Atomic

Volatile and Atomic are two different concepts. Volatile ensures, that a certain, expected (memory) state is true across different threads, while Atomics ensure that operation on variables are performed atomically.

Take the following example of two threads in Java:

Thread A:

value = 1;
done = true;

Thread B:

if (done)
  System.out.println(value);

Starting with value = 0 and done = false the rule of threading tells us, that it is undefined whether or not Thread B will print value. Furthermore value is undefined at that point as well! To explain this you need to know a bit about Java memory management (which can be complex), in short: Threads may create local copies of variables, and the JVM can reorder code to optimize it, therefore there is no guarantee that the above code is run in exactly that order. Setting done to true and then setting value to 1 could be a possible outcome of the JIT optimizations.

volatile only ensures, that at the moment of access of such a variable, the new value will be immediately visible to all other threads and the order of execution ensures, that the code is at the state you would expect it to be. So in case of the code above, defining done as volatile will ensure that whenever Thread B checks the variable, it is either false, or true, and if it is true, then value has been set to 1 as well.

As a side-effect of volatile, the value of such a variable is set thread-wide atomically (at a very minor cost of execution speed). This is however only important on 32-bit systems that i.E. use long (64-bit) variables (or similar), in most other cases setting/reading a variable is atomic anyways. But there is an important difference between an atomic access and an atomic operation. Volatile only ensures that the access is atomically, while Atomics ensure that the operation is atomically.

Take the following example:

i = i + 1;

No matter how you define i, a different Thread reading the value just when the above line is executed might get i, or i + 1, because the operation is not atomically. If the other thread sets i to a different value, in worst case i could be set back to whatever it was before by thread A, because it was just in the middle of calculating i + 1 based on the old value, and then set i again to that old value + 1. Explanation:

Assume i = 0
Thread A reads i, calculates i+1, which is 1
Thread B sets i to 1000 and returns
Thread A now sets i to the result of the operation, which is i = 1

Atomics like AtomicInteger ensure, that such operations happen atomically. So the above issue cannot happen, i would either be 1000 or 1001 once both threads are finished.

Yahoo Finance API

IMHO the best place to find this information is: http://code.google.com/p/yahoo-finance-managed/

I used to use the "gummy-stuff" too but then I found this page which is far more organized and full of easy to use examples. I am using it now to get the data in CSV files and use the files in my C++/Qt project.

Coarse-grained vs fine-grained

In the terms of POS (Part of Speech) Tag,

Fine-grained - Using Penn Treebank Tagset which have 36 different tag
Coarse-grained - Using Universal Tagset which have 12 different tag

Android Studio SDK location

This is the sdk path Android Studio installed for me: "C:\Users\<username>\appdata\local\android\sdk"

I'm running windows 8.1.

You can find the path going into Android Studio -> Configure -> SDK Manager -> On the top left it should say SDK Path.

I don't think it's necessary to install the sdk separately, as the default option for Android Studio is to install the latest sdk too.

How to add a char/int to an char array in C?

The error is due the fact that you are passing a wrong to strcat(). Look at strcat()'s prototype:

   char *strcat(char *dest, const char *src);

But you pass char as the second argument, which is obviously wrong.

Use snprintf() instead.

char str[1024] = "Hello World";
char tmp = '.';
size_t len = strlen(str);

snprintf(str + len, sizeof str - len, "%c", tmp);

As commented by OP:

That was just a example with Hello World to describe the Problem. It must be empty as first in my real program. Program will fill it later. The problem just contains to add a char/int to an char Array

In that case, snprintf() can handle it easily to "append" integer types to a char buffer too. The advantage of snprintf() is that it's more flexible to concatenate various types of data into a char buffer.

For example to concatenate a string, char and an int:

char str[1024];
ch tmp = '.';
int i = 5;

// Fill str here

snprintf(str + len, sizeof str - len, "%c%d", str, tmp, i);

How to add a new column to a CSV file?

Append new column in existing csv file using python without header name

  default_text = 'Some Text'
# Open the input_file in read mode and output_file in write mode
    with open('problem-one-answer.csv', 'r') as read_obj, \
    open('output_1.csv', 'w', newline='') as write_obj:
# Create a csv.reader object from the input file object
    csv_reader = reader(read_obj)
# Create a csv.writer object from the output file object
    csv_writer = csv.writer(write_obj)
# Read each row of the input csv file as list
    for row in csv_reader:
# Append the default text in the row / list
        row.append(default_text)
# Add the updated row / list to the output file
        csv_writer.writerow(row)

Thankyou

When does socket.recv(recv_size) return?

I think you conclusions are correct but not accurate.

As the docs indicates, socket.recv is majorly focused on the network buffers.

When socket is blocking, socket.recv will return as long as the network buffers have bytes. If bytes in the network buffers are more than socket.recv can handle, it will return the maximum number of bytes it can handle. If bytes in the network buffers are less than socket.recv can handle, it will return all the bytes in the network buffers.

Eclipse won't compile/run java file

This worked for me:

Create a new project
Create a class in it
Add erroneous code, let error come
Now go to your project
Go to Problems window
Double click on a error

It starts showing compilation errors in the code.

How to use Lambda in LINQ select statement

using LINQ query expression

 IEnumerable<SelectListItem> stores =
        from store in database.Stores
        where store.CompanyID == curCompany.ID
        select new SelectListItem { Value = store.Name, Text = store.ID };

 ViewBag.storeSelector = stores;

or using LINQ extension methods with lambda expressions

 IEnumerable<SelectListItem> stores = database.Stores
        .Where(store => store.CompanyID == curCompany.ID)
        .Select(store => new SelectListItem { Value = store.Name, Text = store.ID });

 ViewBag.storeSelector = stores;

SQL Query NOT Between Two Dates

Do you mean that the date range of the selected rows should not lie fully within the specified date range? In which case:

select *
from test_table
where start_date < date '2009-12-15'
or end_date > date '2010-01-02';

(Syntax above is for Oracle, yours may differ slightly).

Android: Difference between Parcelable and Serializable?

you can use the serializable objects in the intents but at the time of making serialize a Parcelable object it can give a serious exception like NotSerializableException. Is it not recommended using serializable with Parcelable . So it is better to extends Parcelable with the object that you want to use with bundle and intents. As this Parcelable is android specific so it doesn't have any side effects. :)

Environ Function code samples for VBA

As alluded to by Eric, you can use environ with ComputerName argument like so:

MsgBox Environ("USERNAME")

Some additional information that might be helpful for you to know:

The arguments are not case sensitive.
There is a slightly faster performing string version of the Environ function. To invoke it, use a dollar sign. (Ex: Environ$("username")) This will net you a small performance gain.
You can retrieve all System Environment Variables using this function. (Not just username.) A common use is to get the "ComputerName" value to see which computer the user is logging onto from.
I don't recommend it for most situations, but it can be occasionally useful to know that you can also access the variables with an index. If you use this syntax the the name of argument and the value are returned. In this way you can enumerate all available variables. Valid values are 1 - 255.

    Sub EnumSEVars()
        Dim strVar As String
        Dim i As Long
        For i = 1 To 255
            strVar = Environ$(i)
            If LenB(strVar) = 0& Then Exit For
            Debug.Print strVar
        Next
    End Sub

Is there a good JSP editor for Eclipse?

Check out this one, it's open source http://amateras.sourceforge.jp/cgi-bin/fswiki_en/wiki.cgi?page=EclipseHTMLEditor

How to parse a JSON file in swift?

Here is a code to make the conversions between JSON and NSData in Swift 2.0

// Convert from NSData to json object
func nsdataToJSON(data: NSData) -> AnyObject? {
    do {
        return try NSJSONSerialization.JSONObjectWithData(data, options: .MutableContainers)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil
}

// Convert from JSON to nsdata
func jsonToNSData(json: AnyObject) -> NSData?{
    do {
        return try NSJSONSerialization.dataWithJSONObject(json, options: NSJSONWritingOptions.PrettyPrinted)
    } catch let myJSONError {
        print(myJSONError)
    }
    return nil;
}

LINQ syntax where string value is not null or empty

This won't fail on Linq2Objects, but it will fail for Linq2SQL, so I am assuming that you are talking about the SQL provider or something similar.

The reason has to do with the way that the SQL provider handles your lambda expression. It doesn't take it as a function Func<P,T>, but an expression Expression<Func<P,T>>. It takes that expression tree and translates it so an actual SQL statement, which it sends off to the server.

The translator knows how to handle basic operators, but it doesn't know how to handle methods on objects. It doesn't know that IsNullOrEmpty(x) translates to return x == null || x == string.empty. That has to be done explicitly for the translation to SQL to take place.

WCF Service, the type provided as the service attribute values…could not be found

Double check projects .net versions. Projects that referenced each other with different .net versions causes problems.

How to set the context path of a web application in Tomcat 7.0

The below trick worked for me.

1) Comment/delete the below configuration from server.xml file (inside conf folder) of tomcat.

2) Delete the existing ROOT folder (If any) residing inside tomcat webapps folder. And rename your war (e.g: test.war ) file to ROOT.war.

Remember that while renaming war file to ROOT.war "ROOT" should be in caps.

Limitation: You can deploy only one application inside one tomcat instance.

Early exit from function?

function myfunction() {
     if(a == 'stop') 
         return false;
}

return false; is much better than just return;

Increasing Google Chrome's max-connections-per-server limit to more than 6

IE is even worse with 2 connection per domain limit. But I wouldn't rely on fixing client browsers. Even if you have control over them, browsers like chrome will auto update and a future release might behave differently than you expect. I'd focus on solving the problem within your system design.

Your choices are to:

Load the images in sequence so that only 1 or 2 XHR calls are active at a time (use the success event from the previous image to check if there are more images to download and start the next request).
Use sub-domains like serverA.myphotoserver.com and serverB.myphotoserver.com. Each sub domain will have its own pool for connection limits. This means you could have 2 requests going to 5 different sub-domains if you wanted to. The downfall is that the photos will be cached according to these sub-domains. BTW, these don't need to be "mirror" domains, you can just make additional DNS pointers to the exact same website/server. This means you don't have the headache of administrating many servers, just one server with many DNS records.

How to get the absolute path to the public_html folder?

Out of curiosity, why don't you just use the url for the said folder?

http://www.mysite.com/images

Assuming that the folder never changes location, that would be the easiest way to do it.

How to refresh table contents in div using jquery/ajax

You can load HTML page partial, in your case is everything inside div#mytable.

setTimeout(function(){
   $( "#mytable" ).load( "your-current-page.html #mytable" );
}, 2000); //refresh every 2 seconds

more information read this http://api.jquery.com/load/

Update Code (if you don't want it auto-refresh)

<button id="refresh-btn">Refresh Table</button>

<script>
$(document).ready(function() {

   function RefreshTable() {
       $( "#mytable" ).load( "your-current-page.html #mytable" );
   }

   $("#refresh-btn").on("click", RefreshTable);

   // OR CAN THIS WAY
   //
   // $("#refresh-btn").on("click", function() {
   //    $( "#mytable" ).load( "your-current-page.html #mytable" );
   // });


});
</script>

Export and import table dump (.sql) using pgAdmin

Using PgAdmin step 1: select schema and right click and go to Backup..

step 2: Give the file name and click the backup button.

step 3: In detail message copy the backup file path.

step 4:

Go to other schema and right click and go to Restore. (see step 1)

step 5:

In popup menu paste aboved file path to filename category and click Restore button.

How can I get log4j to delete old rotating log files?

There is no default value to control deleting old log files created by DailyRollingFileAppender. But you can write your own custom Appender that deletes old log files in much the same way as setting maxBackupIndex does for RollingFileAppender.

Simple instructions found here

From 1:

If you are trying to use the Apache Log4J DailyRollingFileAppender for a daily log file, you may need to want to specify the maximum number of files which should be kept. Just like rolling RollingFileAppender supports maxBackupIndex. But the current version of Log4j (Apache log4j 1.2.16) does not provide any mechanism to delete old log files if you are using DailyRollingFileAppender. I tried to make small modifications in the original version of DailyRollingFileAppender to add maxBackupIndex property. So, it would be possible to clean up old log files which may not be required for future usage.

How to create a custom string representation for a class object?

Ignacio Vazquez-Abrams' approved answer is quite right. It is, however, from the Python 2 generation. An update for the now-current Python 3 would be:

class MC(type):
  def __repr__(self):
    return 'Wahaha!'

class C(object, metaclass=MC):
    pass

print(C)

If you want code that runs across both Python 2 and Python 3, the six module has you covered:

from __future__ import print_function
from six import with_metaclass

class MC(type):
  def __repr__(self):
    return 'Wahaha!'

class C(with_metaclass(MC)):
    pass

print(C)

Finally, if you have one class that you want to have a custom static repr, the class-based approach above works great. But if you have several, you'd have to generate a metaclass similar to MC for each, and that can get tiresome. In that case, taking your metaprogramming one step further and creating a metaclass factory makes things a bit cleaner:

from __future__ import print_function
from six import with_metaclass

def custom_class_repr(name):
    """
    Factory that returns custom metaclass with a class ``__repr__`` that
    returns ``name``.
    """
    return type('whatever', (type,), {'__repr__': lambda self: name})

class C(with_metaclass(custom_class_repr('Wahaha!'))): pass

class D(with_metaclass(custom_class_repr('Booyah!'))): pass

class E(with_metaclass(custom_class_repr('Gotcha!'))): pass

print(C, D, E)

prints:

Wahaha! Booyah! Gotcha!

Metaprogramming isn't something you generally need everyday—but when you need it, it really hits the spot!

SQL Server: Filter output of sp_who2

Yes, by capturing the output of sp_who2 into a table and then selecting from the table, but that would be a bad way of doing it. First, because sp_who2, despite its popularity, its an undocumented procedure and you shouldn't rely on undocumented procedures. Second because all sp_who2 can do, and much more, can be obtained from sys.dm_exec_requests and other DMVs, and show can be filtered, ordered, joined and all the other goodies that come with queriable rowsets.

How to get an isoformat datetime string including the default timezone?

You need to make your datetime objects timezone aware. from the datetime docs:

There are two kinds of date and time objects: “naive” and “aware”. This distinction refers to whether the object has any notion of time zone, daylight saving time, or other kind of algorithmic or political time adjustment. Whether a naive datetime object represents Coordinated Universal Time (UTC), local time, or time in some other timezone is purely up to the program, just like it’s up to the program whether a particular number represents metres, miles, or mass. Naive datetime objects are easy to understand and to work with, at the cost of ignoring some aspects of reality.

When you have an aware datetime object, you can use isoformat() and get the output you need.

To make your datetime objects aware, you'll need to subclass tzinfo, like the second example in here, or simpler - use a package that does it for you, like pytz or python-dateutil

Using pytz, this would look like:

import datetime, pytz
datetime.datetime.now(pytz.timezone('US/Central')).isoformat()

You can also control the output format, if you use strftime with the '%z' format directive like

datetime.datetime.now(pytz.timezone('US/Central')).strftime('%Y-%m-%dT%H:%M:%S.%f%z')

MVC3 DropDownListFor - a simple example?

I think this will help : In Controller get the list items and selected value

public ActionResult Edit(int id)
{
    ItemsStore item = itemStoreRepository.FindById(id);
    ViewBag.CategoryId = new SelectList(categoryRepository.Query().Get(), 
                                        "Id", "Name",item.CategoryId);

    // ViewBag to pass values to View and SelectList
    //(get list of items,valuefield,textfield,selectedValue)

    return View(item);
}

and in View

@Html.DropDownList("CategoryId",String.Empty)

OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection

This is a recurring subject in Stackoverflow and since I was unable to find a relevant implementation I decided to accept the challenge.

I made some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet of paper in the image:

void find_squares(Mat& image, vector<vector<Point> >& squares)
{
    // blur will enhance edge detection
    Mat blurred(image);
    medianBlur(image, blurred, 9);

    Mat gray0(blurred.size(), CV_8U), gray;
    vector<vector<Point> > contours;

    // find squares in every color plane of the image
    for (int c = 0; c < 3; c++)
    {
        int ch[] = {c, 0};
        mixChannels(&blurred, 1, &gray0, 1, ch, 1);

        // try several threshold levels
        const int threshold_level = 2;
        for (int l = 0; l < threshold_level; l++)
        {
            // Use Canny instead of zero threshold level!
            // Canny helps to catch squares with gradient shading
            if (l == 0)
            {
                Canny(gray0, gray, 10, 20, 3); // 

                // Dilate helps to remove potential holes between edge segments
                dilate(gray, gray, Mat(), Point(-1,-1));
            }
            else
            {
                    gray = gray0 >= (l+1) * 255 / threshold_level;
            }

            // Find contours and store them in a list
            findContours(gray, contours, CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);

            // Test contours
            vector<Point> approx;
            for (size_t i = 0; i < contours.size(); i++)
            {
                    // approximate contour with accuracy proportional
                    // to the contour perimeter
                    approxPolyDP(Mat(contours[i]), approx, arcLength(Mat(contours[i]), true)*0.02, true);

                    // Note: absolute value of an area is used because
                    // area may be positive or negative - in accordance with the
                    // contour orientation
                    if (approx.size() == 4 &&
                            fabs(contourArea(Mat(approx))) > 1000 &&
                            isContourConvex(Mat(approx)))
                    {
                            double maxCosine = 0;

                            for (int j = 2; j < 5; j++)
                            {
                                    double cosine = fabs(angle(approx[j%4], approx[j-2], approx[j-1]));
                                    maxCosine = MAX(maxCosine, cosine);
                            }

                            if (maxCosine < 0.3)
                                    squares.push_back(approx);
                    }
            }
        }
    }
}

After this procedure is executed, the sheet of paper will be the largest square in vector<vector<Point> >:

opencv paper sheet detection

I'm letting you write the function to find the largest square. ;)

How do I add a linker or compile flag in a CMake file?

Try setting the variable CMAKE_CXX_FLAGS instead of CMAKE_C_FLAGS:

set (CMAKE_CXX_FLAGS "-fexceptions")

The variable CMAKE_C_FLAGS only affects the C compiler, but you are compiling C++ code.

Adding the flag to CMAKE_EXE_LINKER_FLAGS is redundant.

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