Save ArrayList to SharedPreferences

Using this object --> TinyDB--Android-Shared-Preferences-Turbo its very simple.

TinyDB tinydb = new TinyDB(context);

to put

tinydb.putList("MyUsers", mUsersArray);

to get

tinydb.getList("MyUsers");

UPDATE

Some useful examples and troubleshooting might be found here: Android Shared Preference TinyDB putListObject frunction

No internet on Android emulator - why and how to fix?

If by "use internet", you mean you can not access the internet from an activity while testing on the emulator, make sure you have set the internet permission in your AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />

If you are using the web browser, refer to Donal's post

How to place Text and an Image next to each other in HTML?

You want to use css float for this, you can put it directly in your code.

<body>
<img src="website_art.png" height= "75" width="235" style="float:left;"/>
<h3 style="float:right;">The Art of Gaming</h3>
</body>

But I would really suggest learning the basics of css and splitting all your styling out to a separate style sheet, and use classes. It will help you in the future. A good place to start is w3schools or, perhaps later down the path, Mozzila Dev. Network (MDN).

HTML:

<body>
  <img src="website_art.png" class="myImage"/>
  <h3 class="heading">The Art of Gaming</h3>
</body>

CSS:

.myImage {
  float: left;
  height: 75px;
  width: 235px;
  font-family: Veranda;
}
.heading {
  float:right;
}

CSS: create white glow around image

Depends on what your target browsers are. In newer ones it's as simple as:

   -moz-box-shadow: 0 0 5px #fff;
-webkit-box-shadow: 0 0 5px #fff;
        box-shadow: 0 0 5px #fff;

For older browsers you have to implement workarounds, e.g., based on this example, but you will most probably need extra mark-up.

Error System.Data.OracleClient requires Oracle client software version 8.1.7 or greater when installs setup

The error message is pretty self-explanatory: your application needs the Oracle Client installed on the machine it's running on. Your development PC already has it. Make sure your target PC has it, too.

Edit: The System.Data.OracleClient namespace is deprecated. Make sure you use the driver native to your database system, that would be ODP.NET from Oracle.

What's the difference between Html.Label, Html.LabelFor and Html.LabelForModel

Html.Label gives you a label for an input whose name matches the specified input text (more specifically, for the model property matching the string expression):

// Model
public string Test { get; set; }

// View
@Html.Label("Test")

// Output
<label for="Test">Test</label>

Html.LabelFor gives you a label for the property represented by the provided expression (typically a model property):

// Model
public class MyModel
{
    [DisplayName("A property")]
    public string Test { get; set; }
}

// View
@model MyModel
@Html.LabelFor(m => m.Test)

// Output
<label for="Test">A property</label>

Html.LabelForModel is a bit trickier. It returns a label whose for value is that of the parameter represented by the model object. This is useful, in particular, for custom editor templates. For example:

// Model
public class MyModel
{
    [DisplayName("A property")]
    public string Test { get; set; }
}

// Main view
@Html.EditorFor(m => m.Test)

// Inside editor template
@Html.LabelForModel()

// Output
<label for="Test">A property</label>

Convert sqlalchemy row object to python dict

Following @balki answer, since SQLAlchemy 0.8 you can use _asdict(), available for KeyedTuple objects. This renders a pretty straightforward answer to the original question. Just, change in your example the last two lines (the for loop) for this one:

for u in session.query(User).all():
   print u._asdict()

This works because in the above code u is an object of type class KeyedTuple, since .all() returns a list of KeyedTuple. Therefore it has the method _asdict(), which nicely returns u as a dictionary.

WRT the answer by @STB: AFAIK, anything that .all() returns is a list of KeypedTuple. Therefore, the above works either if you specify a column or not, as long as you are dealing with the result of .all() as applied to a Query object.

Determine the number of NA values in a column

If you are looking for NA counts for each column in a dataframe then:

na_count <-sapply(x, function(y) sum(length(which(is.na(y)))))

should give you a list with the counts for each column.

na_count <- data.frame(na_count)

Should output the data nicely in a dataframe like:

----------------------
| row.names | na_count
------------------------
| column_1  | count

What is the equivalent of ngShow and ngHide in Angular 2+?

Best way to deal with this issue using ngIf Because this well prevent getting that element render in front-end,

If you use [hidden]="true" or style hide [style.display] it will only hide element in front end and someone can change the value and visible it easily, In my opinion best way to hide element is ngIf

<div *ngIf="myVar">stuff</div>

and also If you have multiple element (need to implement else also) you can Use <ng-template> option

<ng-container *ngIf="myVar; then loadAdmin else loadMenu"></ng-container>
<ng-template #loadMenu>
     <div>loadMenu</div>
</ng-template>

<ng-template #loadAdmin>
     <div>loadAdmin</div>
</ng-template>

sample ng-template code

Java way to check if a string is palindrome

Here's a good class :

public class Palindrome {

  public static boolean isPalindrome(String stringToTest) {
    String workingCopy = removeJunk(stringToTest);
    String reversedCopy = reverse(workingCopy);

    return reversedCopy.equalsIgnoreCase(workingCopy);
  }

  protected static String removeJunk(String string) {
    int i, len = string.length();
    StringBuffer dest = new StringBuffer(len);
    char c;

    for (i = (len - 1); i >= 0; i--) {
      c = string.charAt(i);
      if (Character.isLetterOrDigit(c)) {
        dest.append(c);
      }
    }

    return dest.toString();
  }

  protected static String reverse(String string) {
    StringBuffer sb = new StringBuffer(string);

    return sb.reverse().toString();
  }

  public static void main(String[] args) {
    String string = "Madam, I'm Adam.";

    System.out.println();
    System.out.println("Testing whether the following "
        + "string is a palindrome:");
    System.out.println("    " + string);
    System.out.println();

    if (isPalindrome(string)) {
      System.out.println("It IS a palindrome!");
    } else {
      System.out.println("It is NOT a palindrome!");
    }
    System.out.println();
  }
}

Enjoy.

Refresh page after form submitting

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <!-- notice the updated action -->
<textarea cols="30" rows="4" name="update" id="update" maxlength="200" ></textarea>
<br />
<input name="submit_button" type="submit"  value=" Update "  id="update_button"  class="update_button"/> <!-- notice added name="" -->
</form>

on your full page, you could have this

<?php

// check if the form was submitted
if ($_POST['submit_button']) {
    // this means the submit button was clicked, and the form has refreshed the page
    // to access the content in text area, you would do this
    $a = $_POST['update'];

    // now $a contains the data from the textarea, so you can do whatever with it
    // this will echo the data on the page
    echo $a;
}
else {
    // form not submitted, so show the form

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>"> <!-- notice the updated action -->
<textarea cols="30" rows="4" name="update" id="update" maxlength="200" ></textarea>
<br />
<input name="submit_button" type="submit"  value=" Update "  id="update_button"  class="update_button"/> <!-- notice added name="" -->
</form>

<?php

} // end "else" loop

?>

CSS disable hover effect

Add the following to add hover effect on disabled button:

.buttonDisabled:hover
  {
    /*your code goes here*/     
  }

Outputting data from unit test in Python

We use the logging module for this.

For example:

import logging
class SomeTest( unittest.TestCase ):
    def testSomething( self ):
        log= logging.getLogger( "SomeTest.testSomething" )
        log.debug( "this= %r", self.this )
        log.debug( "that= %r", self.that )
        # etc.
        self.assertEquals( 3.14, pi )

if __name__ == "__main__":
    logging.basicConfig( stream=sys.stderr )
    logging.getLogger( "SomeTest.testSomething" ).setLevel( logging.DEBUG )
    unittest.main()

That allows us to turn on debugging for specific tests which we know are failing and for which we want additional debugging information.

My preferred method, however, isn't to spend a lot of time on debugging, but spend it writing more fine-grained tests to expose the problem.

How to install a gem or update RubyGems if it fails with a permissions error

You can use: gem install cocoapods --pre --user

JSON - Iterate through JSONArray

for(int i = 0; i < getArray.size(); i++){
      Object object = getArray.get(i);
      // now do something with the Object
}

You need to check for the type:

The values can be any of these types: Boolean, JSONArray, JSONObject, Number, String, or the JSONObject.NULL object. [Source]

In your case, the elements will be of type JSONObject, so you need to cast to JSONObject and call JSONObject.names() to retrieve the individual keys.

Error: getaddrinfo ENOTFOUND in nodejs for get call

I also had same problem and I fixed it by using right proxy. Please double check your proxy settings if you are using proxy network.

Hope this will help you -

Get a CSS value with JavaScript

In 2020

check before use

You can use computedStyleMap()

The answer is valid but sometimes you need to check what unit it returns, you can get that without any slice() or substring() string.

var element = document.querySelector('.js-header-rep');
element.computedStyleMap().get('padding-left');

_x000D_

var element = document.querySelector('.jsCSS');_x000D_
var con = element.computedStyleMap().get('padding-left');_x000D_
console.log(con);

_x000D_

.jsCSS {_x000D_
  width: 10rem;_x000D_
  height: 10rem;_x000D_
  background-color: skyblue;_x000D_
  padding-left: 10px;_x000D_
}

_x000D_

<div class="jsCSS"></div>

_x000D_

Java compile error: "reached end of file while parsing }"

You have to open and close your class with { ... } like:

public class mod_MyMod extends BaseMod
{
  public String Version()
  {
    return "1.2_02";
  }

  public void AddRecipes(CraftingManager recipes)
  {
     recipes.addRecipe(new ItemStack(Item.diamond), new Object[] {
        "#", Character.valueOf('#'), Block.dirt });
  }
}

How can one pull the (private) data of one's own Android app?

Similar to Tamas's answer, here is a one-liner for Mac OS X to fetch all of the files for app with your.app.id from your device and save them to (in this case) ~/Desktop/your.app.id:

(
    id=your.app.id &&
    dest=~/Desktop &&
    adb shell "run-as $id cp -r /data/data/$id /sdcard" &&
    adb -d pull "/sdcard/$id" "$dest" &&
    if [ -n "$id" ]; then adb shell "rm -rf /sdcard/$id"; fi
)

Exclude the -d to pull from emulator
Doesn't stomp your session variables
You can paste the whole block into Terminal.app (or remove newlines if desired)

Java BigDecimal: Round to the nearest whole value

Here's an awfully complicated solution, but it works:

public static BigDecimal roundBigDecimal(final BigDecimal input){
    return input.round(
        new MathContext(
            input.toBigInteger().toString().length(),
            RoundingMode.HALF_UP
        )
    );
}

Test Code:

List<BigDecimal> bigDecimals =
    Arrays.asList(new BigDecimal("100.12"),
        new BigDecimal("100.44"),
        new BigDecimal("100.50"),
        new BigDecimal("100.75"));
for(final BigDecimal bd : bigDecimals){
    System.out.println(roundBigDecimal(bd).toPlainString());
}

Output:

100
100
101
101

Simple PHP calculator

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Calculator</title>
    </head>
    <body>
    HTML Code is here:

         <form method="post">
            <input type="text" name="numb1">
            <input type="text" name="numb2">
            <select name="operator" id="">
               <option>None</option>
               <option>Add</option>
               <option>Subtract</option>
               <option>Multiply</option>
               <option>Divide</option>
               <option>Square</option>
            </select>
            <button type="submit" name="submit" value="submit">Calculate</button>
         </form>

    PHP Code:

        <?php 

            if (isset($_POST['submit'])) {
                $result1 = $_POST['numb1'];
                $result2 = $_POST['numb2'];
                $operator = $_POST['operator'];
                switch ($operator) {
                    case 'None':
                        echo "You need to select any operator";
                        break;
                    case 'Add':
                        echo $result1 + $result2;
                        break;
                    case 'Subtract':
                        echo $result1 - $result2;
                        break;
                    case 'Multiply':
                        echo $result1 * $result2;
                        break;
                    case 'Divide':
                        echo $result1 / $result2;
                        break;
                    case 'Square':
                        echo $result1 ** $result2;
                        break;
                }
            }


         ?>
        enter code here

    </body>
    </html>

How to center an element horizontally and vertically

Approach 1 - transform translateX/translateY:

Example Here / Full Screen Example

In supported browsers (most of them), you can use top: 50%/left: 50% in combination with translateX(-50%) translateY(-50%) to dynamically vertically/horizontally center the element.

_x000D_

.container {_x000D_
    position: absolute;_x000D_
    top: 50%;_x000D_
    left: 50%;_x000D_
    -moz-transform: translateX(-50%) translateY(-50%);_x000D_
    -webkit-transform: translateX(-50%) translateY(-50%);_x000D_
    transform: translateX(-50%) translateY(-50%);_x000D_
}

_x000D_

<div class="container">_x000D_
    <span>I'm vertically/horizontally centered!</span>_x000D_
</div>

_x000D_

Approach 2 - Flexbox method:

Example Here / Full Screen Example

In supported browsers, set the display of the targeted element to flex and use align-items: center for vertical centering and justify-content: center for horizontal centering. Just don't forget to add vendor prefixes for additional browser support (see example).

_x000D_

html, body, .container {_x000D_
    height: 100%;_x000D_
}_x000D_
_x000D_
.container {_x000D_
    display: -webkit-flexbox;_x000D_
    display: -ms-flexbox;_x000D_
    display: -webkit-flex;_x000D_
    display: flex;_x000D_
    -webkit-flex-align: center;_x000D_
    -ms-flex-align: center;_x000D_
    -webkit-align-items: center;_x000D_
    align-items: center;_x000D_
    justify-content: center;_x000D_
}

_x000D_

<div class="container"> _x000D_
  <span>I'm vertically/horizontally centered!</span>_x000D_
</div>

_x000D_

Approach 3 - table-cell/vertical-align: middle:

Example Here / Full Screen Example

In some cases, you will need to ensure that the html/body element's height is set to 100%.

For vertical alignment, set the parent element's width/height to 100% and add display: table. Then for the child element, change the display to table-cell and add vertical-align: middle.

For horizontal centering, you could either add text-align: center to center the text and any other inline children elements. Alternatively, you could use margin: 0 auto, assuming the element is block level.

_x000D_

html, body {_x000D_
    height: 100%;_x000D_
}_x000D_
.parent {_x000D_
    width: 100%;_x000D_
    height: 100%;_x000D_
    display: table;_x000D_
    text-align: center;_x000D_
}_x000D_
.parent > .child {_x000D_
    display: table-cell;_x000D_
    vertical-align: middle;_x000D_
}

_x000D_

<section class="parent">_x000D_
    <div class="child">I'm vertically/horizontally centered!</div>_x000D_
</section>

_x000D_

Approach 4 - Absolutely positioned 50% from the top with displacement:

Example Here / Full Screen Example

This approach assumes that the text has a known height - in this instance, 18px. Just absolutely position the element 50% from the top, relative to the parent element. Use a negative margin-top value that is half of the element's known height, in this case - -9px.

_x000D_

html, body, .container {_x000D_
    height: 100%;_x000D_
}_x000D_
_x000D_
.container {_x000D_
    position: relative;_x000D_
    text-align: center;_x000D_
}_x000D_
_x000D_
.container > p {_x000D_
    position: absolute;_x000D_
    top: 50%;_x000D_
    left: 0;_x000D_
    right: 0;_x000D_
    margin-top: -9px;_x000D_
}

_x000D_

<div class="container">_x000D_
    <p>I'm vertically/horizontally centered!</p>_x000D_
</div>

_x000D_

Approach 5 - The line-height method (Least flexible - not suggested):

Example Here

In some cases, the parent element will have a fixed height. For vertical centering, all you have to do is set a line-height value on the child element equal to the fixed height of the parent element.

Though this solution will work in some cases, it's worth noting that it won't work when there are multiple lines of text - like this.

_x000D_

.parent {_x000D_
    height: 200px;_x000D_
    width: 400px;_x000D_
    background: lightgray;_x000D_
    text-align: center;_x000D_
}_x000D_
_x000D_
.parent > .child {_x000D_
    line-height: 200px;_x000D_
}

_x000D_

<div class="parent">_x000D_
    <span class="child">I'm vertically/horizontally centered!</span>_x000D_
</div>

_x000D_

Clearing a text field on button click

How about just a simple reset button?

<form>

  <input type="text" id="textfield1" size="5">
  <input type="text" id="textfield2" size="5">

  <input type="reset" value="Reset">

</form>

What are the differences between if, else, and else if?

There's no "else if". You have the following:

if (condition)
    statement or block

Or:

if (condition)
    statement or block
else
    statement or block

In the first case, the statement or block is executed if the condition is true (different than 0). In the second case, if the condition is true, the first statement or block is executed, otherwise the second statement or block is executed.

So, when you write "else if", that's an "else statement", where the second statement is an if statement. You might have problems if you try to do this:

if (condition)
    if (condition)
        statement or block
else
    statement or block

The problem here being you want the "else" to refer to the first "if", but you are actually referring to the second one. You fix this by doing:

if (condition)
{
    if (condition)
        statement or block
} else
    statement or block

clearing a char array c

An array in C is just a memory location, so indeed, your my_custom_data[0] = '\0'; assignment simply sets the first element to zero and leaves the other elements intact.

If you want to clear all the elements of the array, you'll have to visit each element. That is what memset is for:

memset(&arr[0], 0, sizeof(arr));

This is generally the fastest way to take care of this. If you can use C++, consider std::fill instead:

char *begin = &arr;
char *end = begin + sizeof(arr);
std::fill(begin, end, 0);

CSS filter: make color image with transparency white

To my knowledge, there is sadly no CSS filter to colorise an element (perhaps with the use of some SVG filter magic, but I'm somewhat unfamiliar with that) and even if that wasn't the case, filters are basically only supported by webkit browsers.

With that said, you could still work around this and use a canvas to modify your image. Basically, you can draw an image element onto a canvas and then loop through the pixels, modifying the respective RGBA values to the colour you want.

However, canvases do come with some restrictions. Most importantly, you have to make sure that the image src comes from the same domain as the page. Otherwise the browser won't allow you to read or modify the pixel data of the canvas.

Here's a JSFiddle changing the colour of the JSFiddle logo.

_x000D_

//Base64 source, but any local source will work_x000D_
var src = "data:image/png;base64,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";_x000D_
var canvas = document.getElementById("theCanvas");_x000D_
var ctx = canvas.getContext("2d");_x000D_
var img = new Image;_x000D_
_x000D_
//wait for the image to load_x000D_
img.onload = function() {_x000D_
    //Draw the original image so that you can fetch the colour data_x000D_
    ctx.drawImage(img,0,0);_x000D_
    var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height);_x000D_
    _x000D_
    /*_x000D_
    imgData.data is a one-dimensional array which contains _x000D_
    the respective RGBA values for every pixel _x000D_
    in the selected region of the context _x000D_
    (note i+=4 in the loop)_x000D_
    */_x000D_
    _x000D_
    for (var i = 0; i < imgData.data.length; i+=4) {_x000D_
   imgData.data[i] = 255; //Red, 0-255_x000D_
   imgData.data[i+1] = 255; //Green, 0-255_x000D_
   imgData.data[i+2] = 255; //Blue, 0-255_x000D_
   /* _x000D_
   imgData.data[i+3] contains the alpha value_x000D_
   which we are going to ignore and leave_x000D_
   alone with its original value_x000D_
   */_x000D_
    }_x000D_
    ctx.clearRect(0, 0, canvas.width, canvas.height); //clear the original image_x000D_
    ctx.putImageData(imgData, 0, 0); //paint the new colorised image_x000D_
}_x000D_
_x000D_
//Load the image!_x000D_
img.src = src;

_x000D_

body {_x000D_
    background: green;_x000D_
}

_x000D_

<canvas id="theCanvas"></canvas>

_x000D_

What is and how to fix System.TypeInitializationException error?

I have the error of system.typeintialzationException, which is due to when I tried to move the file like:

 File.Move(DestinationFilePath, SourceFilePath)

That error was due to I had swapped the path actually, correct one is:

 File.Move(SourceFilePath, DestinationFilePath)

How do I compare 2 rows from the same table (SQL Server)?

I had a situation where I needed to compare each row of a table with the next row to it, (next here is relative to my problem specification) in the example next row is specified using the order by clause inside the row_number() function.

so I wrote this:

DECLARE @T TABLE (col1 nvarchar(50));

insert into @T VALUES ('A'),('B'),('C'),('D'),('E')

select I1.col1 Instance_One_Col, I2.col1 Instance_Two_Col  from (
 select col1,row_number() over (order by col1) as row_num
 FROM @T
) AS I1
left join (
 select col1,row_number() over (order by col1) as row_num
 FROM @T
) AS I2 on I1.row_num = I2.row_num - 1

after that I can compare each row to the next one as I need

Javascript can't find element by id?

Script is called before element exists.

You should try one of the following:

wrap code into a function and use a body onload event to call it.
put script at the end of document
use defer attribute into script tag declaration

How to set alignment center in TextBox in ASP.NET?

Add the css styling text-align: center to the control.

Ideally you would do this through a css class assigned to the control, but if you must do it directly, here is an example:

<asp:TextBox ID="myTextBox" runat="server" style="text-align: center"></asp:TextBox>

How to check for file lock?

Here's a variation of DixonD's code that adds number of seconds to wait for file to unlock, and try again:

public bool IsFileLocked(string filePath, int secondsToWait)
{
    bool isLocked = true;
    int i = 0;

    while (isLocked &&  ((i < secondsToWait) || (secondsToWait == 0)))
    {
        try
        {
            using (File.Open(filePath, FileMode.Open)) { }
            return false;
        }
        catch (IOException e)
        {
            var errorCode = Marshal.GetHRForException(e) & ((1 << 16) - 1);
            isLocked = errorCode == 32 || errorCode == 33;
            i++;

            if (secondsToWait !=0)
                new System.Threading.ManualResetEvent(false).WaitOne(1000);
        }
    }

    return isLocked;
}


if (!IsFileLocked(file, 10))
{
    ...
}
else
{
    throw new Exception(...);
}

Tar archiving that takes input from a list of files

You can also pipe in the file names which might be useful:

find /path/to/files -name \*.txt | tar -cvf allfiles.tar -T -

how to make a countdown timer in java

You can create a countdown timer using applet, below is the code,

   import java.applet.*;
   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;
   import javax.swing.Timer; // not java.util.Timer
   import java.text.NumberFormat;
   import java.net.*;



/**
    * An applet that counts down from a specified time. When it reaches 00:00,
    * it optionally plays a sound and optionally moves the browser to a new page.
    * Place the mouse over the applet to pause the count; move it off to resume.
    * This class demonstrates most applet methods and features.
    **/

public class Countdown extends JApplet implements ActionListener, MouseListener
{
long remaining; // How many milliseconds remain in the countdown.
long lastUpdate; // When count was last updated
JLabel label; // Displays the count
Timer timer; // Updates the count every second
NumberFormat format; // Format minutes:seconds with leading zeros
Image image; // Image to display along with the time
AudioClip sound; // Sound to play when we reach 00:00

// Called when the applet is first loaded
public void init() {
    // Figure out how long to count for by reading the "minutes" parameter
    // defined in a <param> tag inside the <applet> tag. Convert to ms.
    String minutes = getParameter("minutes");
    if (minutes != null) remaining = Integer.parseInt(minutes) * 60000;
    else remaining = 600000; // 10 minutes by default

    // Create a JLabel to display remaining time, and set some properties.
    label = new JLabel();
    label.setHorizontalAlignment(SwingConstants.CENTER );
    label.setOpaque(true); // So label draws the background color

    // Read some parameters for this JLabel object
    String font = getParameter("font");
    String foreground = getParameter("foreground");
    String background = getParameter("background");
    String imageURL = getParameter("image");

    // Set label properties based on those parameters
    if (font != null) label.setFont(Font.decode(font));
    if (foreground != null) label.setForeground(Color.decode(foreground));
    if (background != null) label.setBackground(Color.decode(background));
    if (imageURL != null) {
        // Load the image, and save it so we can release it later
        image = getImage(getDocumentBase(), imageURL);
        // Now display the image in the JLabel.
        label.setIcon(new ImageIcon(image));
    }

    // Now add the label to the applet. Like JFrame and JDialog, JApplet
    // has a content pane that you add children to
    getContentPane().add(label, BorderLayout.CENTER);

    // Get an optional AudioClip to play when the count expires
    String soundURL = getParameter("sound");
    if (soundURL != null) sound=getAudioClip(getDocumentBase(), soundURL);

    // Obtain a NumberFormat object to convert number of minutes and
    // seconds to strings. Set it up to produce a leading 0 if necessary
    format = NumberFormat.getNumberInstance();
    format.setMinimumIntegerDigits(2); // pad with 0 if necessary

    // Specify a MouseListener to handle mouse events in the applet.
    // Note that the applet implements this interface itself
    addMouseListener(this);

    // Create a timer to call the actionPerformed() method immediately,
    // and then every 1000 milliseconds. Note we don't start the timer yet.
    timer = new Timer(1000, this);
    timer.setInitialDelay(0); // First timer is immediate.
}

// Free up any resources we hold; called when the applet is done
public void destroy() { if (image != null) image.flush(); }

// The browser calls this to start the applet running
// The resume() method is defined below.
public void start() { resume(); } // Start displaying updates

// The browser calls this to stop the applet. It may be restarted later.
// The pause() method is defined below
public void stop() { pause(); } // Stop displaying updates

// Return information about the applet
public String getAppletInfo() {
    return "Countdown applet Copyright (c) 2003 by David Flanagan";
}

// Return information about the applet parameters
public String[][] getParameterInfo() { return parameterInfo; }

// This is the parameter information. One array of strings for each
// parameter. The elements are parameter name, type, and description.
static String[][] parameterInfo = {
    {"minutes", "number", "time, in minutes, to countdown from"},
    {"font", "font", "optional font for the time display"},
    {"foreground", "color", "optional foreground color for the time"},
    {"background", "color", "optional background color"},
    {"image", "image URL", "optional image to display next to countdown"},
    {"sound", "sound URL", "optional sound to play when we reach 00:00"},
    {"newpage", "document URL", "URL to load when timer expires"},
};

// Start or resume the countdown
void resume() {
    // Restore the time we're counting down from and restart the timer.
    lastUpdate = System.currentTimeMillis();
    timer.start(); // Start the timer
}

// Pause the countdown
void pause() {
    // Subtract elapsed time from the remaining time and stop timing
    long now = System.currentTimeMillis();
    remaining -= (now - lastUpdate);
    timer.stop(); // Stop the timer
}

// Update the displayed time. This method is called from actionPerformed()
// which is itself invoked by the timer.
void updateDisplay() {
    long now = System.currentTimeMillis(); // current time in ms
    long elapsed = now - lastUpdate; // ms elapsed since last update
    remaining -= elapsed; // adjust remaining time
    lastUpdate = now; // remember this update time

    // Convert remaining milliseconds to mm:ss format and display
    if (remaining < 0) remaining = 0;
    int minutes = (int)(remaining/60000);
    int seconds = (int)((remaining)/1000);
    label.setText(format.format(minutes) + ":" + format.format(seconds));

    // If we've completed the countdown beep and display new page
    if (remaining == 0) {
        // Stop updating now.
        timer.stop();
        // If we have an alarm sound clip, play it now.
        if (sound != null) sound.play();
        // If there is a newpage URL specified, make the browser
        // load that page now.
        String newpage = getParameter("newpage");
        if (newpage != null) {
            try {
                URL url = new URL(getDocumentBase(), newpage);
                getAppletContext().showDocument(url);
            }
            catch(MalformedURLException ex) {      showStatus(ex.toString()); }
        }
    }
}

// This method implements the ActionListener interface.
// It is invoked once a second by the Timer object
// and updates the JLabel to display minutes and seconds remaining.
public void actionPerformed(ActionEvent e) { updateDisplay(); }

// The methods below implement the MouseListener interface. We use
// two of them to pause the countdown when the mouse hovers over the timer.
// Note that we also display a message in the statusline
public void mouseEntered(MouseEvent e) {
    pause(); // pause countdown
    showStatus("Paused"); // display statusline message
}
public void mouseExited(MouseEvent e) {
    resume(); // resume countdown
    showStatus(""); // clear statusline
}
// These MouseListener methods are unused.
public void mouseClicked(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}

cv2.imshow command doesn't work properly in opencv-python

I found the answer that worked for me here: http://txt.arboreus.com/2012/07/11/highgui-opencv-window-from-ipython.html

If you run an interactive ipython session, and want to use highgui windows, do cv2.startWindowThread() first.

In detail: HighGUI is a simplified interface to display images and video from OpenCV code. It should be as easy as:

import cv2
img = cv2.imread("image.jpg")
cv2.startWindowThread()
cv2.namedWindow("preview")
cv2.imshow("preview", img)

Python error message io.UnsupportedOperation: not readable

There are few modes to open file (read, write etc..)

If you want to read from file you should type file = open("File.txt","r"), if write than file = open("File.txt","w"). You need to give the right permission regarding your usage.

more modes:

r. Opens a file for reading only.
rb. Opens a file for reading only in binary format.
r+ Opens a file for both reading and writing.
rb+ Opens a file for both reading and writing in binary format.
w. Opens a file for writing only.
you can find more modes in here

Null & empty string comparison in Bash

fedorqui has a working solution but there is another way to do the same thing.

Chock if a variable is set

#!/bin/bash
amIEmpty='Hello'
# This will be true if the variable has a value
if [ $amIEmpty ]; then
    echo 'No, I am not!';
fi

Or to verify that a variable is empty

#!/bin/bash      
amIEmpty=''
# This will be true if the variable is empty
if [ ! $amIEmpty ]; then
    echo 'Yes I am!';
fi

tldp.org has good documentation about if in bash:
http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html

Update GCC on OSX

If you install macports you can install gcc select, and then choose your gcc version.

/opt/local/bin/port install gcc_select

To see your versions use

port select --list gcc

To select a version use

sudo port select --set gcc gcc40

Can a CSV file have a comment?

The CSV "standard" (such as it is) does not dictate how comments should be handled, no, it's up to the application to establish a convention and stick with it.

Running conda with proxy

You can configure a proxy with conda by adding it to the .condarc, like

proxy_servers:
    http: http://user:[email protected]:8080
    https: https://user:[email protected]:8080

Then in cmd Anaconda Power Prompt (base) PS C:\Users\user> run:

conda update -n root conda

Passing Parameters JavaFX FXML

javafx.scene.Node class has a pair of methods setUserData(Object) and Object getUserData()

Which you could use to add your info to the Node.

So, you can call page.setUserData(info);

And controller can check, if info is set. Also, you could use ObjectProperty for back-forward data transfering, if needed.

Observe a documentation here: http://docs.oracle.com/javafx/2/api/javafx/fxml/doc-files/introduction_to_fxml.html Before the phrase "In the first version, the handleButtonAction() is tagged with @FXML to allow markup defined in the controller's document to invoke it. In the second example, the button field is annotated to allow the loader to set its value. The initialize() method is similarly annotated."

So, you need to associate a controller with a node, and set a user data to the node.

PostgreSQL naming conventions

Regarding tables names, case, etc, the prevalent convention is:

SQL keywords: UPPER CASE
names (identifiers): lower_case_with_underscores

For example:

UPDATE my_table SET name = 5;

This is not written in stone, but the bit about identifiers in lower case is highly recommended, IMO. Postgresql treats identifiers case insensitively when not quoted (it actually folds them to lowercase internally), and case sensitively when quoted; many people are not aware of this idiosyncrasy. Using always lowercase you are safe. Anyway, it's acceptable to use camelCase or PascalCase (or UPPER_CASE), as long as you are consistent: either quote identifiers always or never (and this includes the schema creation!).

I am not aware of many more conventions or style guides. Surrogate keys are normally made from a sequence (usually with the serial macro), it would be convenient to stick to that naming for those sequences if you create them by hand (tablename_colname_seq).

See also some discussion here, here and (for general SQL) here, all with several related links.

Note: Postgresql 10 introduced identity columns as an SQL-compliant replacement for serial.

Get SELECT's value and text in jQuery

$('select').val()  // Get's the value

$('select option:selected').val() ; // Get's the value

$('select').find('option:selected').val() ; // Get's the value

$('select option:selected').text()  // Gets you the text of the selected option

Check FIDDLE

How to determine one year from now in Javascript

2020

It's perfect date/time library called Moment.js with this library you can simply write:

moment().subtract(1,'year')

and call any format you wish:

moment().subtract(1,'year').toDate()
moment().subtract(1,'year').toISOString()

See full documentation here: https://momentjs.com/

Mock a constructor with parameter

With mockito you can use withSettings(), for example if the CounterService required 2 dependencies, you can pass them as a mock:

UserService userService = Mockito.mock(UserService.class); SearchService searchService = Mockito.mock(SearchService.class); CounterService counterService = Mockito.mock(CounterService.class, withSettings().useConstructor(userService, searchService));

How can one use multi threading in PHP applications

While you can't thread, you do have some degree of process control in php. The two function sets that are useful here are:

Process control functions http://www.php.net/manual/en/ref.pcntl.php

POSIX functions http://www.php.net/manual/en/ref.posix.php

You could fork your process with pcntl_fork - returning the PID of the child. Then you can use posix_kill to despose of that PID.

That said, if you kill a parent process a signal should be sent to the child process telling it to die. If php itself isn't recognising this you could register a function to manage it and do a clean exit using pcntl_signal.

How to fix: fatal error: openssl/opensslv.h: No such file or directory in RedHat 7

On CYGwin, you can install this as a typical package in the first screen. Look for

libssl-devel

Proper way to initialize C++ structs

I write some test code:

#include <string>
#include <iostream>
#include <stdio.h>

using namespace std;

struct sc {
    int x;
    string y;
    int* z;
};

int main(int argc, char** argv)
{
   int* r = new int[128];
   for(int i = 0; i < 128; i++ ) {
        r[i] = i+32;
   }
   cout << r[100] << endl;
   delete r;

   sc* a = new sc;
   sc* aa = new sc[2];
   sc* b = new sc();
   sc* ba = new sc[2]();

   cout << "az:" << a->z << endl;
   cout << "bz:" << b->z << endl;
   cout << "a:" << a->x << " y" << a->y << "end" << endl;
   cout << "b:" << b->x << " y" << b->y <<  "end" <<endl;
   cout << "aa:" << aa->x << " y" << aa->y <<  "end" <<endl;
   cout << "ba:" << ba->x << " y" << ba->y <<  "end" <<endl;
}

g++ compile and run:

./a.out 
132
az:0x2b0000002a
bz:0
a:854191480 yend
b:0 yend
aa:854190968 yend
ba:0 yend

Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails

I was moving data directory on a cloned server and having troubles to login as postgres. Resetting postgres password like this worked for me.

root# su postgres
postgres$ psql -U postgres
psql (9.3.6) 
Type "help" for help. 
postgres=#\password 
Enter new password: 
Enter it again: 
postgres=#

Get combobox value in Java swing

If the string is empty, comboBox.getSelectedItem().toString() will give a NullPointerException. So better to typecast by (String).

Quick Way to Implement Dictionary in C

here is a quick implement, i used it to get a 'Matrix'(sruct) from a string. you can have a bigger array and change its values on the run also:

typedef struct  { int** lines; int isDefined; }mat;
mat matA, matB, matC, matD, matE, matF;

/* an auxilary struct to be used in a dictionary */
typedef struct  { char* str; mat *matrix; }stringToMat;

/* creating a 'dictionary' for a mat name to its mat. lower case only! */
stringToMat matCases [] =
{
    { "mat_a", &matA },
    { "mat_b", &matB },
    { "mat_c", &matC },
    { "mat_d", &matD },
    { "mat_e", &matE },
    { "mat_f", &matF },
};

mat* getMat(char * str)
{
    stringToMat* pCase;
    mat * selected = NULL;
    if (str != NULL)
    {
        /* runing on the dictionary to get the mat selected */
        for(pCase = matCases; pCase != matCases + sizeof(matCases) / sizeof(matCases[0]); pCase++ )
        {
            if(!strcmp( pCase->str, str))
                selected = (pCase->matrix);
        }
        if (selected == NULL)
            printf("%s is not a valid matrix name\n", str);
    }
    else
        printf("expected matrix name, got NULL\n");
    return selected;
}

Format SQL in SQL Server Management Studio

Late answer, but hopefully worthwhile: The Poor Man's T-SQL Formatter is an open-source (free) T-SQL formatter with complete T-SQL batch/script support (any DDL, any DML), SSMS Plugin, command-line bulk formatter, and other options.

It's available for immediate/online use at http://poorsql.com, and just today graduated to "version 1.0" (it was in beta version for a few months), having just acquired support for MERGE statements, OUTPUT clauses, and other finicky stuff.

The SSMS Add-in allows you to set your own hotkey (default is Ctrl-K, Ctrl-F, to match Visual Studio), and formats the entire script or just the code you have selected/highlighted, if any. Output formatting is customizable.

In SSMS 2008 it combines nicely with the built-in intelli-sense, effectively providing more-or-less the same base functionality as Red Gate's SQL Prompt (SQL Prompt does, of course, have extra stuff, like snippets, quick object scripting, etc).

Feedback/feature requests are more than welcome, please give it a whirl if you get the chance!

Disclosure: This is probably obvious already but I wrote this library/tool/site, so this answer is also shameless self-promotion :)

How to create an Oracle sequence starting with max value from a table?

use dynamic sql

BEGIN
            DECLARE
            maxId NUMBER;
              BEGIN
              SELECT MAX(id)+1
              INTO maxId
              FROM table_name;          
              execute immediate('CREATE SEQUENCE sequane_name MINVALUE '||maxId||' START WITH '||maxId||' INCREMENT BY 1 NOCACHE NOCYCLE');
              END;
END;

jQuery get the image src

When dealing with the HTML DOM (ie. this), the array selector [0] must be used to retrieve the jQuery element from the Javascript array.

$(this)[0].getAttribute('src');

MongoDB: How to update multiple documents with a single command?

In the MongoDB Client, type:

db.Collection.updateMany({}, $set: {field1: 'field1', field2: 'field2'})

New in version 3.2

Params::

{}:  select all records updated

Keyword argument multi not taken

JAVA How to remove trailing zeros from a double

Use a DecimalFormat object with a format string of "0.#".

pdftk compression option

Trying to compress a PDF I made with 400ppi tiffs, mostly 8-bit, a few 24-bit, with PackBits compression, using tiff2pdf compressed with Zip/Deflate. One problem I had with every one of these methods: none of the above methods preserved the bookmarks TOC that I painstakingly manually created in Acrobat Pro X. Not even the recommended ebook setting for gs. Sure, I could just open a copy of the original with the TOC intact and do a Replace pages but unfortunately, none of these methods did a satisfactory job to begin with. Either they reduced the size so much that the quality was unacceptably pixellated, or they didn't reduce the size at all and in one case actually increased it despite quality loss.

pdftk compress:

no change in size
bookmarks TOC are gone

gs screen:

takes a ridiculously long time and 100% CPU
errors:
    sfopen: gs_parse_file_name failed.                                 ? 
    | ./base/gsicc_manage.c:1651: gsicc_set_device_profile(): cannot find device profile
74.8MB-->10.2MB hideously pixellated
bookmarks TOC are gone

gs printer:

takes a ridiculously long time and 100% CPU
no errors
74.8MB-->66.1MB
light blue background on pages 1-4
bookmarks TOC are gone

gs ebook:

errors:
    sfopen: gs_parse_file_name failed.
      ./base/gsicc_manage.c:1050: gsicc_open_search(): Could not find default_rgb.ic 
    | ./base/gsicc_manage.c:1651: gsicc_set_device_profile(): cannot find device profile
74.8MB-->32.2MB
badly pixellated
bookmarks TOC are gone

qpdf --linearize:

very fast, a few seconds
no size change
bookmarks TOC are gone

pdf2ps:

took very long time
output_pdf2ps.ps 74.8MB-->331.6MB

ps2pdf:

pretty fast
74.8MB-->79MB
very slightly degraded with sl. bluish background
bookmarks TOC are gone

Warn user before leaving web page with unsaved changes

Check out the JavaScript onbeforeunload event. It's non-standard JavaScript introduced by Microsoft, however it works in most browsers and their onbeforeunload documentation has more information and examples.

How can I set the initial value of Select2 when using AJAX?

What I've done is more clean and needs to make two arrays :

one contains a list of Object with id and a text (in my case its id and name, depending of your templateResult) (its what you get from ajax query)
the second is only an array of ids (selection value)

I initialize select2 using the first array as data, and the second as the val.

An example function with as parameters a dict of id:name.

function initMyList(values) {
    var selected = [];
    var initials = [];

    for (var s in values) {
        initials.push({id: s, name: values[s].name});
        selected.push(s);
    }

    $('#myselect2').select2({
        data: initials,
        ajax: {
            url: "/path/to/value/",
            dataType: 'json',
            delay: 250,
            data: function (params) {
                return {
                    term: params.term,
                    page: params.page || 1,
                };
            },
            processResults: function (data, params) {
                params.page = params.page || 1;

                return {
                    results: data.items,
                    pagination: {
                        more: (params.page * 30) < data.total_count
                    }
                };
            },
            cache: true
        },
        minimumInputLength: 1,
        tokenSeparators: [",", " "],
        placeholder: "Select none, one or many values",
        templateResult: function (item) { return item.name; },
        templateSelection: function (item) { return item.name; },
        matcher: function(term, text) { return text.name.toUpperCase().indexOf(term.toUpperCase()) != -1; },
    });

    $('#myselect2').val(selected).trigger('change');
}

You can feed the initials value using ajax calls, and use jquery promises to do the select2 initialization.

Class file has wrong version 52.0, should be 50.0

In your IntelliJ idea find tools.jar replace it with tools.jar from yout JDK8

Find string between two substrings

These solutions assume the start string and final string are different. Here is a solution I use for an entire file when the initial and final indicators are the same, assuming the entire file is read using readlines():

def extractstring(line,flag='$'):
    if flag in line: # $ is the flag
        dex1=line.index(flag)
        subline=line[dex1+1:-1] #leave out flag (+1) to end of line
        dex2=subline.index(flag)
        string=subline[0:dex2].strip() #does not include last flag, strip whitespace
    return(string)

Example:

lines=['asdf 1qr3 qtqay 45q at $A NEWT?$ asdfa afeasd',
    'afafoaltat $I GOT BETTER!$ derpity derp derp']
for line in lines:
    string=extractstring(line,flag='$')
    print(string)

Gives:

A NEWT?
I GOT BETTER!

What is the difference between field, variable, attribute, and property in Java POJOs?

My understanding is as below, and I am not saying that this is 100% correct, I might as well be mistaken..

A variable is something that you declare, which can by default change and have different values, but that can also be explicitly said to be final. In Java that would be:

public class Variables {

    List<Object> listVariable; // declared but not assigned
    final int aFinalVariableExample = 5; // declared, assigned and said to be final!

    Integer foo(List<Object> someOtherObjectListVariable) {
        // declare..
        Object iAmAlsoAVariable;

        // assign a value..
        iAmAlsoAVariable = 5;

        // change its value..
        iAmAlsoAVariable = 8;

        someOtherObjectListVariable.add(iAmAlsoAVariable);

        return new Integer();
    }
}

So basically, a variable is anything that is declared and can hold values. Method foo above returns a variable for example.. It returns a variable of type Integer which holds the memory address of the new Integer(); Everything else you see above are also variables, listVariable, aFinalVariableExample and explained here:

A field is a variable where scope is more clear (or concrete). The variable returning from method foo 's scope is not clear in the example above, so I would not call it a field. On the other hand, iAmAlsoVariable is a "local" field, limited by the scope of the method foo, and listVariable is an "instance" field where the scope of the field (variable) is limited by the objects scope.

A property is a field that can be accessed / mutated. Any field that exposes a getter / setter is a property.

I do not know about attribute and I would also like to repeat that this is my understanding of what variables, fields and properties are.

Save Javascript objects in sessionStorage

Session storage cannot support an arbitrary object because it may contain function literals (read closures) which cannot be reconstructed after a page reload.

Return only string message from Spring MVC 3 Controller

This is just a note for those who might find this question later, but you don't have to pull in the response to change the content type. Here's an example below to do just that:

@RequestMapping(method = RequestMethod.GET, value="/controller")
public ResponseEntity<byte[]> displayUploadedFile()
{
  HttpHeaders headers = new HttpHeaders();
  String disposition = INLINE;
  String fileName = "";
  headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);

  //Load your attachment here

  if (Arrays.equals(Constants.HEADER_BYTES_PDF, contentBytes)) {
    headers.setContentType(MediaType.valueOf("application/pdf"));
    fileName += ".pdf";
  }

  if (Arrays.equals(Constants.HEADER_BYTES_TIFF_BIG_ENDIAN, contentBytes)
      || Arrays.equals(Constantsr.HEADER_BYTES_TIFF_LITTLE_ENDIAN, contentBytes)) {
    headers.setContentType(MediaType.valueOf("image/tiff"));
    fileName += ".tif";
  }

  if (Arrays.equals(Constants.HEADER_BYTES_JPEG, contentBytes)) {
    headers.setContentType(MediaType.IMAGE_JPEG);
    fileName += ".jpg";
  }

  //Handle other types if necessary

  headers.add("Content-Disposition", , disposition + ";filename=" + fileName);
  return new ResponseEntity<byte[]>(uploadedBytes, headers, HttpStatus.OK);
}

Are querystring parameters secure in HTTPS (HTTP + SSL)?

remember, SSL/TLS operates at the Transport Layer, so all the crypto goo happens under the application-layer HTTP stuff.

http://en.wikipedia.org/wiki/File:IP_stack_connections.svg

that's the long way of saying, "Yes!"

Implementing SearchView in action bar

If anyone else is having a nullptr on the searchview variable, I found out that the item setup is a tiny bit different:

old:

android:showAsAction="ifRoom"
android:actionViewClass="android.widget.SearchView"

new:

app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="androidx.appcompat.widget.SearchView"

pre-android x:

app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.support.v7.widget.SearchView"

For more information, it's updated documentation is located here.

Get text of label with jquery

Try using the html() function.

$('#<%=Label1.ClientID%>').html();

You're also missing the # to make it an ID you're searching for. Without the #, it's looking for a tag type.

Convert JsonObject to String

JSONObject metadata = (JSONObject) data.get("map"); //for example
String jsonString = metadata.**toJSONString()**;

Test if something is not undefined in JavaScript

Check if you're response[0] actually exists, the error seems to suggest it doesn't.

How can one develop iPhone apps in Java?

I think we will have to wait a couple of years more to see more progress. However, there are now more frameworks and tools available:

Here a list of 5 options:

Codename One
RoboVM <-- Closed
Avian no maintainer
XMLVM
J2ObjC
Multi-OS Engine not maintained

Python pandas: how to specify data types when reading an Excel file?

In case if you are not aware of the number and name of columns in dataframe then this method can be handy:

column_list = []
df_column = pd.read_excel(file_name, 'Sheet1').columns
for i in df_column:
    column_list.append(i)
converter = {col: str for col in column_list} 
df_actual = pd.read_excel(file_name, converters=converter)

where column_list is the list of your column names.

How can I install packages using pip according to the requirements.txt file from a local directory?

Use:

pip install -r requirements.txt

For further details, please check the help option:

pip install --help

We can find the option '-r' -

-r, --requirement Install from the given requirements file. This option can be used multiple times.

Further information on some commonly used pip install options (this is the help option on the pip install command):

Also the above is the complete set of options. Please use pip install --help for the complete list of options.

How to stop an app on Heroku?

You can disable the app using enable maintenance mode from the admin panel.

Go to settings tabs.
In bottom just before deleting the app. enable maintenance mode. see in the screenshot below.

How do I add a library (android-support-v7-appcompat) in IntelliJ IDEA

Another solution for maven (and a better solution, for me at least) is to use the maven repository included in the local android SDK. To do this, just add a new repository into your pom pointing at the local android SDK:

<repository>
    <id>android-support</id>
    <url>file://${env.ANDROID_HOME}/extras/android/m2repository</url>
</repository>

After adding this repository you can add the standard Google dependency like this:

<dependency>
    <groupId>com.android.support</groupId>
    <artifactId>support-v13</artifactId>
    <version>${support-v13.version}</version>
</dependency>

<dependency>
    <groupId>com.android.support</groupId>
    <artifactId>appcompat-v7</artifactId>
    <version>${appcompat-v7.version}</version>
    <type>aar</type>
</dependency>

How can I run a directive after the dom has finished rendering?

there is a ngcontentloaded event, I think you can use it

.directive('directiveExample', function(){
   return {
       restrict: 'A',
       link: function(scope, elem, attrs){

                $$window = $ $window


                init = function(){
                    contentHeight = elem.outerHeight()
                    //do the things
                }

                $$window.on('ngcontentloaded',init)

       }
   }
});

Android Get Application's 'Home' Data Directory

Of course, never fails. Found the solution about a minute after posting the above question... solution for those that may have had the same issue:

ContextWrapper.getFilesDir()

Found here.

Connecting to Oracle Database through C#?

You can use Oracle.ManagedDataAccess NuGet package too (.NET >= 4.0, database >= 10g Release 2).

How to use ADB in Android Studio to view an SQLite DB

The issue you are having is common and not explained well in the documentation. Normal devices do not include the sqlite3 database binary which is why you are getting an error. the Android Emeulator, OSX, Linux (if installed) and Windows (after installed) have the binary so you can open a database locally on your machine.

The workaround is to copy the Database from your device to your local machine. This can be accomplished with ADB but requires a number of steps.

Before you start you will need some information:

path of the SDK (if not included in your OS environment)
your <package name>, for example, com.example.application
a <local path> to place your database, eg. ~/Desktop or %userprofile%\Desktop

Next you will need to understand what terminal each command gets written to the first character in the examples below does not get typed but lets you know what shell we are in:

> = you OS command prompt
$ = ADB shell command Prompt
! = ADB shell as admin command prompt
%

Next enter the following commands from Terminal or Command (don't enter first character or text in ())

> adb shell
$ su
! cp /data/data/<package name>/Databases/<database name> /sdcard
! exit
$ exit
> adb pull /sdcard/<database name> <local path>
> sqlite3 <local db path>
% .dump
% .exit  (to exit sqldb)

This is a really round about way of copying the database to your local machine and locally reading the database. There are SO and other resources explaining how to install the sqlite3 binary onto your device from an emulator but for one time access this process works.

If you need to access the database interactively I would suggest running your app in an emulator (that already had sqlite3) or installing sqlite onto your devices /xbin path.

Swift do-try-catch syntax

There are two important points to the Swift 2 error handling model: exhaustiveness and resiliency. Together, they boil down to your do/catch statement needing to catch every possible error, not just the ones you know you can throw.

Notice that you don't declare what types of errors a function can throw, only whether it throws at all. It's a zero-one-infinity sort of problem: as someone defining a function for others (including your future self) to use, you don't want to have to make every client of your function adapt to every change in the implementation of your function, including what errors it can throw. You want code that calls your function to be resilient to such change.

Because your function can't say what kind of errors it throws (or might throw in the future), the catch blocks that catch it errors don't know what types of errors it might throw. So, in addition to handling the error types you know about, you need to handle the ones you don't with a universal catch statement -- that way if your function changes the set of errors it throws in the future, callers will still catch its errors.

do {
    let sandwich = try makeMeSandwich(kitchen)
    print("i eat it \(sandwich)")
} catch SandwichError.NotMe {
    print("Not me error")
} catch SandwichError.DoItYourself {
    print("do it error")
} catch let error {
    print(error.localizedDescription)
}

But let's not stop there. Think about this resilience idea some more. The way you've designed your sandwich, you have to describe errors in every place where you use them. That means that whenever you change the set of error cases, you have to change every place that uses them... not very fun.

The idea behind defining your own error types is to let you centralize things like that. You could define a description method for your errors:

extension SandwichError: CustomStringConvertible {
    var description: String {
        switch self {
            case NotMe: return "Not me error"
            case DoItYourself: return "Try sudo"
        }
    }
}

And then your error handling code can ask your error type to describe itself -- now every place where you handle errors can use the same code, and handle possible future error cases, too.

do {
    let sandwich = try makeMeSandwich(kitchen)
    print("i eat it \(sandwich)")
} catch let error as SandwichError {
    print(error.description)
} catch {
    print("i dunno")
}

This also paves the way for error types (or extensions on them) to support other ways of reporting errors -- for example, you could have an extension on your error type that knows how to present a UIAlertController for reporting the error to an iOS user.

MySQL wait_timeout Variable - GLOBAL vs SESSION

SHOW SESSION VARIABLES LIKE "wait_timeout"; -- 28800
SHOW GLOBAL VARIABLES LIKE "wait_timeout"; -- 28800

At first, wait_timeout = 28800 which is the default value. To change the session value, you need to set the global variable because the session variable is read-only.

SET @@GLOBAL.wait_timeout=300

After you set the global variable, the session variable automatically grabs the value.

SHOW SESSION VARIABLES LIKE "wait_timeout"; -- 300
SHOW GLOBAL VARIABLES LIKE "wait_timeout"; -- 300

Next time when the server restarts, the session variables will be set to the default value i.e. 28800.

P.S. I m using MySQL 5.6.16

Using Colormaps to set color of line in matplotlib

U may do as I have written from my deleted account (ban for new posts :( there was). Its rather simple and nice looking.

Im using 3-rd one of these 3 ones usually, also I wasny checking 1 and 2 version.

from matplotlib.pyplot import cm
import numpy as np

#variable n should be number of curves to plot (I skipped this earlier thinking that it is obvious when looking at picture - sorry my bad mistake xD): n=len(array_of_curves_to_plot)
#version 1:

color=cm.rainbow(np.linspace(0,1,n))
for i,c in zip(range(n),color):
   ax1.plot(x, y,c=c)

#or version 2: - faster and better:

color=iter(cm.rainbow(np.linspace(0,1,n)))
c=next(color)
plt.plot(x,y,c=c)

#or version 3:

color=iter(cm.rainbow(np.linspace(0,1,n)))
for i in range(n):
   c=next(color)
   ax1.plot(x, y,c=c)

example of 3:

Ship RAO of Roll vs Ikeda damping in function of Roll amplitude A44

How to fetch the row count for all tables in a SQL SERVER database

SQL Server 2005 or later gives quite a nice report showing table sizes - including row counts etc. It's in Standard Reports - and it is Disc Usage by Table.

Programmatically, there's a nice solution at: http://www.sqlservercentral.com/articles/T-SQL/67624/

NSRange from Swift Range?

My solution is a string extension that first gets the swift range then get's the distance from the start of the string to the start and end of the substring.

These values are then used to calculate the start and length of the substring. We can then apply these values to the NSMakeRange constructor.

This solution works with substrings that consist of multiple words, which a lot of the solutions here using enumerateSubstrings let me down on.

extension String {

    func NSRange(of substring: String) -> NSRange? {
        // Get the swift range 
        guard let range = range(of: substring) else { return nil }

        // Get the distance to the start of the substring
        let start = distance(from: startIndex, to: range.lowerBound) as Int
        //Get the distance to the end of the substring
        let end = distance(from: startIndex, to: range.upperBound) as Int

        //length = endOfSubstring - startOfSubstring
        //start = startOfSubstring
        return NSMakeRange(start, end - start)
    }

}

Disable hover effects on mobile browsers

Right, I jst had a similar problem but managed to fix it with media queries and simple CSS. I'm sure I'm breaking some rules here, but it's working for me.

I basically had to take a massive application someone made, and make it responsive. They used jQueryUI and asked me not to tamper with any of their jQuery, so I was restricted to using CSS alone.

When I pressed one of their buttons in touchscreen mode, the hover effect woudld fire for a second before the button's action took effect. Here's how I fixed it.

@media only screen and (max-width:1024px) {

       #buttonOne{
            height: 44px;
        }


        #buttonOne:hover{
            display:none;
        }
}

Regex: Use start of line/end of line signs (^ or $) in different context

You can't use ^ and $ in character classes in the way you wish - they will be interpreted literally, but you can use an alternation to achieve the same effect:

(^|,)garp(,|$)

How to add custom Http Header for C# Web Service Client consuming Axis 1.4 Web service

If you want to send a custom HTTP Header (not a SOAP Header) then you need to use the HttpWebRequest class the code would look like:

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.Headers.Add("Authorization", token);

You cannot add HTTP headers using the visual studio generated proxy, which can be a real pain.

How to fill the whole canvas with specific color?

Yes, fill in a Rectangle with a solid color across the canvas, use the height and width of the canvas itself:

_x000D_

var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "blue";
ctx.fillRect(0, 0, canvas.width, canvas.height);

_x000D_

canvas{ border: 1px solid black; }

_x000D_

<canvas width=300 height=150 id="canvas">

_x000D_

Redirect on select option in select box

I'd strongly suggest moving away from inline JavaScript, to something like the following:

function redirect(goto){
    var conf = confirm("Are you sure you want to go elswhere?");
    if (conf && goto != '') {
        window.location = goto;
    }
}

var selectEl = document.getElementById('redirectSelect');

selectEl.onchange = function(){
    var goto = this.value;
    redirect(goto);

};

JS Fiddle demo (404 linkrot victim).
JS Fiddle demo via Wayback Machine.
Forked JS Fiddle for current users.

In the mark-up in the JS Fiddle the first option has no value assigned, so clicking it shouldn't trigger the function to do anything, and since it's the default value clicking the select and then selecting that first default option won't trigger the change event anyway.

Update:
The latest example's (2017-08-09) redirect URLs required swapping out due to errors regarding mixed content between JS Fiddle and both domains, as well as both domains requiring 'sameorigin' for framed content. - Albert

Using Java with Nvidia GPUs (CUDA)

I'd start by using one of the projects out there for Java and CUDA: http://www.jcuda.org/

How to change Windows 10 interface language on Single Language version

You can download language pack and use "Install or Uninstall display languages" wizard. To do this:

Press Win+R, paste lpksetup and press Enter
Wizard will appear on the screen
Click the Install display languages button
In the next page of the wizard, click Browse and pick the *.cab file of the MUI language you downloaded
Click the Next button to install language

The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %>)

I have had the same issue that I solved this way:

Instead of adding the meta to the current page header that caused the same error as you had:

Page.Header.Controls.Add(meta);

I used this instead:

 Master.FindControl("YourHeadContentPlaceHolder").Controls.Add(meta);

and it works like a charm.

How to change content on hover

This exact example is present on mozilla developers page:

::after

As you can see it even allows you to create tooltips! :) Also, instead of embedding the actual text in your CSS, you may use content: attr(data-descr);, and store it in data-descr="ADD" attribute of your HTML tag (which is nice because you can e.g translate it)

CSS content can only be usef with :after and :before pseudo-elements, so you can try to proceed with something like this:

.item a p.new-label span:after{
  position: relative;
  content: 'NEW'
}
.item:hover a p.new-label span:after {
  content: 'ADD';
}

The CSS :after pseudo-element matches a virtual last child of the selected element. Typically used to add cosmetic content to an element, by using the content CSS property. This element is inline by default.

The 'json' native gem requires installed build tools

I have found that the error is sometimes caused by a missing library.

so If you install RDOC first by running

gem install rdoc

then install rails with:

gem install rails

then go back and install the devtools as mentioned before with:

1) Extract DevKit to path C:\Ruby193\DevKit
2) cd C:\Ruby192\DevKit
3) ruby dk.rb init
4) ruby dk.rb review
5) ruby dk.rb install

then try installing json

which culminate with you finally being able to run

rails new project_name - without errors.

good luck

X close button only using css

_x000D_

<div style="width: 10px; height: 10px; position: relative; display: flex; justify-content: center;">
   <div style="width: 1.5px; height: 100%; background-color: #9c9f9c; position: absolute; transform: rotate(45deg); border-radius: 2px;"></div>
   <div style="width: 1.5px; height: 100%; background-color: #9c9f9c; position: absolute; transform: rotate(-45deg); border-radius: 2px;"></div>
</div>

_x000D_

How can I solve "Non-static method xxx:xxx() should not be called statically in PHP 5.4?

Disabling the alert message is not a way to solve the problem. Despite the PHP core is continue to work it makes a dangerous assumptions and actions.

Never ignore the error where PHP should make an assumptions of something!!!!

If the class organized as a singleton you can always use function getInstance() and then use getData()

Likse:

$classObj = MyClass::getInstance();
$classObj->getData();

If the class is not a singleton, use

 $classObj = new MyClass();
 $classObj->getData();

Java: get all variable names in a class

https://docs.oracle.com/javase/tutorial/reflect/class/classMembers.html also has charts for locating methods and constructors.

Why do I get an error instantiating an interface?

The error message seems self-explanatory. You can't instantiate an instance of an interface, and you've declared IUser as an interface. (The same rule applies to abstract classes.) The whole point of an interface is that it doesn't do anything—there is no implementation provided for its methods.

However, you can instantiate an instance of a class that implements that interface (provides an implementation for its methods), which in your case is the User class.

Thus, your code needs to look like this:

IUser user = new User();

This instantiates an instance of the User class (which provides the implementation), and assigns it to an object variable for the interface type (IUser, which provides the interface, the way in which you as the programmer can interact with the object).

Of course, you could also write:

User user = new User();

which creates an instance of the User class and assigns it to an object variable of the same type, but that sort of defeats the purpose of a defining a separate interface in the first place.

How to define a two-dimensional array?

The accepted answer is good and correct, but it took me a while to understand that I could also use it to create a completely empty array.

l =  [[] for _ in range(3)]

results in

[[], [], []]

Adding an onclicklistener to listview (android)

listView.setOnItemClickListener(new OnItemClickListener() {

    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Object o = prestListView.getItemAtPosition(position);
        prestationEco str = (prestationEco)o; //As you are using Default String Adapter
        Toast.makeText(getBaseContext(),str.getTitle(),Toast.LENGTH_SHORT).show();
    }
});

How to remove whitespace from a string in typescript?

Problem

The trim() method removes whitespace from both sides of a string.

Source

Solution

You can use a Javascript replace method to remove white space like

"hello world".replace(/\s/g, "");

Example

_x000D_

var out = "hello world".replace(/\s/g, "");_x000D_
console.log(out);

_x000D_

How to auto adjust the <div> height according to content in it?

Try with the following mark-up instead of directly specifying height:

_x000D_

.box-centerside {_x000D_
  background: url("../images/greybox-center-bg1.jpg") repeat-x scroll center top transparent;_x000D_
  float: left;_x000D_
  min-height: 100px;_x000D_
  width: 260px;_x000D_
}

_x000D_

<div class="box-centerside">_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
  This is sample content<br>_x000D_
</div>

_x000D_

Java 8 Streams: multiple filters vs. complex condition

A complex filter condition is better in performance perspective, but the best performance will show old fashion for loop with a standard if clause is the best option. The difference on a small array 10 elements difference might ~ 2 times, for a large array the difference is not that big.
You can take a look on my GitHub project, where I did performance tests for multiple array iteration options

For small array 10 element throughput ops/s: For medium 10,000 elements throughput ops/s: For large array 1,000,000 elements throughput ops/s:

NOTE: tests runs on

8 CPU
1 GB RAM
OS version: 16.04.1 LTS (Xenial Xerus)
java version: 1.8.0_121
jvm: -XX:+UseG1GC -server -Xmx1024m -Xms1024m

UPDATE: Java 11 has some progress on the performance, but the dynamics stay the same

Benchmark mode: Throughput, ops/time

How do I correctly detect orientation change using Phonegap on iOS?

if (window.matchMedia("(orientation: portrait)").matches) {
   // you're in PORTRAIT mode
}

if (window.matchMedia("(orientation: landscape)").matches) {
  // you're in LANDSCAPE mode
}

Iterate through Nested JavaScript Objects

To increase performance for further tree manipulation is good to transform tree view into line collection view, like [obj1, obj2, obj3]. You can store parent-child object relations to easy navigate to parent/child scope.

Searching element inside collection is more efficient then find element inside tree (recursion, addition dynamic function creation, closure).

Multiple select in Visual Studio?

There is a new extension for Visual Studio 2017 called SelectNextOccurrence which is free and open-source.

This extension makes it possible to select next occurrences of a selected text for editing.

Aims to replicate the Ctrl+D command of Sublime Text for faster coding.

Features:

Select next occurrence of current selection.
Skip occurrence
Undo occurrence
Add caret above/below
Use multiple carets to edit (Alt-click to add caret)

Visual Studio commands:

SelectNextOccurrence.SelectNextOccurrence is bound to Ctrl+D by default.
SelectNextOccurrence.SkipOccurrence is not bound by default. (Recommended Ctrl+K, Ctrl+D)
SelectNextOccurrence.UndoOccurrence is not bound by default. (Recommended Ctrl+U)
SelectNextOccurrence.AddCaretAbove is not bound by default. (Recommended Ctrl+Alt+Up)
SelectNextOccurrence.AddCaretBelow is not bound by default. (Recommended Ctrl+Alt+Down)

SelectNextOccurrence options

https://marketplace.visualstudio.com/items?itemName=thomaswelen.SelectNextOccurrence

https://github.com/2mas/SelectNextOccurrence

How to use ng-repeat without an html element

You might want to flatten the data within your controller:

function MyCtrl ($scope) {
  $scope.myData = [[1,2,3], [4,5,6], [7,8,9]];
  $scope.flattened = function () {
    var flat = [];
    $scope.myData.forEach(function (item) {
      flat.concat(item);
    }
    return flat;
  }
}

And then in the HTML:

<table>
  <tbody>
    <tr ng-repeat="item in flattened()"><td>{{item}}</td></tr>
  </tbody>
</table>

Laravel stylesheets and javascript don't load for non-base routes

Laravel 5.4 with mix helper:

<link href="{{ mix('/css/app.css') }}" rel="stylesheet">
<script src="{{ mix('/js/app.js') }}"> </script>

Access localhost from the internet

There are couple of good free service that let you do the same. Ideal for showing something quickly for testing:

Edits:

add ngrok service
add localhost.run service

Input placeholders for Internet Explorer

Works only for IE9+

The following solution binds to input text elements with the placeholder attribute. It emulates a placeholder behaviour just for IE and clears the input's value field on submit if it is not changed.

Add this script and IE would seem to support HTML5 placeholders.

  $(function() {
  //Run this script only for IE
  if (navigator.appName === "Microsoft Internet Explorer") {
    $("input[type=text]").each(function() {
      var p;
     // Run this script only for input field with placeholder attribute
      if (p = $(this).attr('placeholder')) {
      // Input field's value attribute gets the placeholder value.
        $(this).val(p);
        $(this).css('color', 'gray');
        // On selecting the field, if value is the same as placeholder, it should become blank
        $(this).focus(function() {
          if (p === $(this).val()) {
            return $(this).val('');
          }
        });
         // On exiting field, if value is blank, it should be assigned the value of placeholder
        $(this).blur(function() {
          if ($(this).val() === '') {
            return $(this).val(p);
          }
        });
      }
    });
    $("input[type=password]").each(function() {
      var e_id, p;
      if (p = $(this).attr('placeholder')) {
        e_id = $(this).attr('id');
        // change input type so that the text is displayed
        document.getElementById(e_id).type = 'text';
        $(this).val(p);
        $(this).focus(function() {
          // change input type so that password is not displayed
          document.getElementById(e_id).type = 'password';
          if (p === $(this).val()) {
            return $(this).val('');
          }
        });
        $(this).blur(function() {
          if ($(this).val() === '') {
            document.getElementById(e_id).type = 'text';
            $(this).val(p);
          }
        });
      }
    });
    $('form').submit(function() {
      //Interrupt submission to blank out input fields with placeholder values
      $("input[type=text]").each(function() {
        if ($(this).val() === $(this).attr('placeholder')) {
          $(this).val('');
        }
      });
     $("input[type=password]").each(function() {
        if ($(this).val() === $(this).attr('placeholder')) {
           $(this).val('');
        }
      });
    });
  }
});

Are the shift operators (<<, >>) arithmetic or logical in C?

When shifting left, there is no difference between arithmetic and logical shift. When shifting right, the type of shift depends on the type of the value being shifted.

(As background for those readers unfamiliar with the difference, a "logical" right shift by 1 bit shifts all the bits to the right and fills in the leftmost bit with a 0. An "arithmetic" shift leaves the original value in the leftmost bit. The difference becomes important when dealing with negative numbers.)

When shifting an unsigned value, the >> operator in C is a logical shift. When shifting a signed value, the >> operator is an arithmetic shift.

For example, assuming a 32 bit machine:

signed int x1 = 5;
assert((x1 >> 1) == 2);
signed int x2 = -5;
assert((x2 >> 1) == -3);
unsigned int x3 = (unsigned int)-5;
assert((x3 >> 1) == 0x7FFFFFFD);

Unable to install Maven on Windows: "JAVA_HOME is set to an invalid directory"

ERROR: JAVA_HOME is set to an invalid directory. JAVA_HOME = "E:\Sun\SDK\jdk\bin" Please set the JAVA_HOME variable in your environment to match the location of your Java installation

JAVA_HOME should be set to E:\Sun\SDK\jdk. PATH should be set to include %JAVA_HOME%\bin.

EXCEL Multiple Ranges - need different answers for each range

Nested if's in Excel Are ugly:

=If(G2 < 1, .1, IF(G2 < 5,.15,if(G2 < 15,.2,if(G2 < 30,.5,if(G2 < 100,.1,1.3)))))

That should cover it.

How to make an introduction page with Doxygen

Add any file in the documentation which will include your content, for example toc.h:

@ mainpage Manual SDK
<hr/>
@ section pageTOC Content
  -# @ref Description
  -# @ref License
  -# @ref Item
...

And in your Doxyfile:

INPUT = toc.h \

Example (in Russian):

Opening a remote machine's Windows C drive

By default, Windows makes the root of each drive available (provided you've got Administrator privileges) as (e.g.) \\server\c$. These are known as Administrative Shares.

Using Html.ActionLink to call action on different controller

try it it is working fine

  <%:Html.ActionLink("Details","Details","Product",  new {id=item.dateID },null)%>

How should strace be used?

Strace stands out as a tool for investigating production systems where you can't afford to run these programs under a debugger. In particular, we have used strace in the following two situations:

Program foo seems to be in deadlock and has become unresponsive. This could be a target for gdb; however, we haven't always had the source code or sometimes were dealing with scripted languages that weren't straight-forward to run under a debugger. In this case, you run strace on an already running program and you will get the list of system calls being made. This is particularly useful if you are investigating a client/server application or an application that interacts with a database
Investigating why a program is slow. In particular, we had just moved to a new distributed file system and the new throughput of the system was very slow. You can specify strace with the '-T' option which will tell you how much time was spent in each system call. This helped to determine why the file system was causing things to slow down.

For an example of analyzing using strace see my answer to this question.

Javascript getElementsByName.value not working

Here is the example for having one or more checkboxes value. If you have two or more checkboxes and need values then this would really help.

_x000D_

function myFunction() {_x000D_
  var selchbox = [];_x000D_
  var inputfields = document.getElementsByName("myCheck");_x000D_
  var ar_inputflds = inputfields.length;_x000D_
_x000D_
  for (var i = 0; i < ar_inputflds; i++) {_x000D_
    if (inputfields[i].type == 'checkbox' && inputfields[i].checked == true)_x000D_
      selchbox.push(inputfields[i].value);_x000D_
  }_x000D_
  return selchbox;_x000D_
_x000D_
}_x000D_
_x000D_
document.getElementById('btntest').onclick = function() {_x000D_
  var selchb = myFunction();_x000D_
  console.log(selchb);_x000D_
}

_x000D_

Checkbox:_x000D_
<input type="checkbox" name="myCheck" value="UK">United Kingdom_x000D_
<input type="checkbox" name="myCheck" value="USA">United States_x000D_
<input type="checkbox" name="myCheck" value="IL">Illinois_x000D_
<input type="checkbox" name="myCheck" value="MA">Massachusetts_x000D_
<input type="checkbox" name="myCheck" value="UT">Utah_x000D_
_x000D_
<input type="button" value="Click" id="btntest" />

_x000D_

Create Excel files from C# without office

Use OleDB, you can create, read, and edit excel files pretty easily. Read the MSDN docs for more info:

http://msdn.microsoft.com/en-us/library/aa288452(VS.71).aspx

I've used OleDB to read from excel files and I know you can create them, but I haven't done it firsthand.

How to write to a JSON file in the correct format

Require the JSON library, and use to_json.

require 'json'
tempHash = {
    "key_a" => "val_a",
    "key_b" => "val_b"
}
File.open("public/temp.json","w") do |f|
  f.write(tempHash.to_json)
end

Your temp.json file now looks like:

{"key_a":"val_a","key_b":"val_b"}

Merging two arrays in .NET

This is what I came up with. Works for a variable number of arrays.

public static T[] ConcatArrays<T>(params T[][] args)
    {
        if (args == null)
            throw new ArgumentNullException();

        var offset = 0;
        var newLength = args.Sum(arr => arr.Length); 
        var newArray = new T[newLength];

        foreach (var arr in args)
        {
            Buffer.BlockCopy(arr, 0, newArray, offset, arr.Length);
            offset += arr.Length;
        }

        return newArray;
    }

...

var header = new byte[] { 0, 1, 2};
var data = new byte[] { 3, 4, 5, 6 };
var checksum = new byte[] {7, 0};
var newArray = ConcatArrays(header, data, checksum);
//output byte[9] { 0, 1, 2, 3, 4, 5, 6, 7, 0 }

How to include bootstrap css and js in reactjs app?

Via npm, you would run the folowing

npm install bootstrap jquery --save
npm install css-loader style-loader --save-dev

If bootstrap 4, also add dependency popper.js

npm install popper.js --save

Add the following (as a new object) to your webpack config

loaders: [
    {
      test: /\.css$/,
      loader: 'style-loader!css-loader'
    }

Add the following to your index, or layout

import 'bootstrap/dist/css/bootstrap.css';
import 'bootstrap/dist/js/bootstrap.js';

Bootstrap how to get text to vertical align in a div container

Could you not have simply added:

align-items:center;

to a new class in your row div. Essentially:

<div class="row align_center">

.align_center { align-items:center; }

UITextField text change event

Swift 4

func addNotificationObservers() {

    NotificationCenter.default.addObserver(self, selector: #selector(textFieldDidChangeAction(_:)), name: .UITextFieldTextDidChange, object: nil)

}

@objc func textFieldDidChangeAction(_ notification: NSNotification) {

    let textField = notification.object as! UITextField
    print(textField.text!)

}

How do I create a unique constraint that also allows nulls?

Maybe consider an "INSTEAD OF" trigger and do the check yourself? With a non-clustered (non-unique) index on the column to enable the lookup.

Sorting dropdown alphabetically in AngularJS

var module = angular.module("example", []);

module.controller("orderByController", function ($scope) {
    $scope.orderByValue = function (value) {
        return value;
    };

    $scope.items = ["c", "b", "a"];
    $scope.objList = [
        {
            "name": "c"
        }, {
            "name": "b"
        }, {
            "name": "a"
        }];
        $scope.item = "b";
    });

http://jsfiddle.net/Nfv42/65/

Pyinstaller setting icons don't change

I know this is old and whatnot (and not exactly sure if it's a question), but after searching, I had success with this command for --onefile:

pyinstaller.exe --onefile --windowed --icon=app.ico app.py

Google led me to this page while I was searching for an answer on how to set an icon for my .exe, so maybe it will help someone else.

The information here was found at this site: https://mborgerson.com/creating-an-executable-from-a-python-script

React Js: Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

I had the same issue with fetch and decided to switch to axios. Fixed the issue right away, here's the code snippet.

var axios = require('axios');

  var config = {
    method: 'get',
    url: 'http://localhost:4000/'
  };
  
  axios(config)
  .then(function (response) {
    console.log(JSON.stringify(response.data));
  })
  .catch(function (error) {
    console.log(error);
  });

Error: Microsoft Visual C++ 10.0 is required (Unable to find vcvarsall.bat) when running Python script

I got the same error and ended up using a pre-built distribution of numpy available in SourceForge (similarly, a distribution of matplotlib can be obtained).

Builds for both 32-bit 2.7 and 3.3/3.4 are available.
PyCharm detected them straight away, of course.

Passing parameters to click() & bind() event in jquery?

var someParam = xxxxxxx;

commentbtn.click(function(){

    alert(someParam );
});

ANTLR: Is there a simple example?

version 4.7.1 was slightly different : for import:

import org.antlr.v4.runtime.*;

for the main segment - note the CharStreams:

CharStream in = CharStreams.fromString("12*(5-6)");
ExpLexer lexer = new ExpLexer(in);
CommonTokenStream tokens = new CommonTokenStream(lexer);
ExpParser parser = new ExpParser(tokens);

How do I set the background color of Excel cells using VBA?

or alternatively you could not bother coding for it and use the 'conditional formatting' function in Excel which will set the background colour and font colour based on cell value.

There are only two variables here so set the default to yellow and then overwrite when the value is greater than or less than your threshold values.

jQuery removeClass wildcard

I had the same issue and came up with the following that uses underscore's _.filter method. Once I discovered that removeClass takes a function and provides you with a list of classnames, it was easy to turn that into an array and filter out the classname to return back to the removeClass method.

// Wildcard removeClass on 'color-*'
$('[class^="color-"]').removeClass (function (index, classes) {
  var
    classesArray = classes.split(' '),
    removeClass = _.filter(classesArray, function(className){ return className.indexOf('color-') === 0; }).toString();

  return removeClass;
});

Get git branch name in Jenkins Pipeline/Jenkinsfile

For pipeline:

pipeline {
  environment {
     BRANCH_NAME = "${GIT_BRANCH.split("/")[1]}"
  }
}

Java: how to use UrlConnection to post request with authorization?

I don't see anywhere in the code where you specify that this is a POST request. Then again, you need a java.net.HttpURLConnection to do that.

In fact, I highly recommend using HttpURLConnection instead of URLConnection, with conn.setRequestMethod("POST"); and see if it still gives you problems.

Convert string date to timestamp in Python

>>> int(datetime.datetime.strptime('01/12/2011', '%d/%m/%Y').strftime("%s"))
1322683200

Reading NFC Tags with iPhone 6 / iOS 8

The iPhone6/6s/6+ are NOT designed to read passive NFC tags (aka Discovery Mode). There's a lot of misinformation on this topic, so I thought to provide some tangible info for developers to consider. The lack of NFC tag read support is not because of software but because of hardware. To understand why, you need to understand how NFC works. NFC works by way of Load Modulation. That means that the interrogator (PCD) emits a carrier magnetic field that energizes the passive target (PICC). With the potential generated by this carrier field, the target then is able to demodulate data coming from the interrogator and respond by modulating data over top of this very same field. The key here is that the target never creates a field of its own.

If you look at the iPhone6 teardown and parts list you will see the presence of a very small NFC loop antenna as well as the use of the AS3923 booster IC. This design was intended for custom microSD or SIM cards to enable mobile phones of old to do payments. This is the type of application where the mobile phone presents a Card Emulated credential to a high power contactless POS terminal. The POS terminal acts as the reader, energizing the iPhone6 with help from the AS3923 chip. The AS3923 block diagram clearly shows how the RX and TX modulation is boosted from a signal presented by a reader device. In other words the iPhone6 is not meant to provide a field, only to react to one. That's why it's design is only meant for NFC Card Emulation and perhaps Peer-2-Peer, but definitely not tag Discovery.

AS3923 booster IC

There are some alternatives to achieving tag Discovery with an iPhone6 using HW accessories. I talk about these integrations and how developers can architect solutions in this blog post. Our low power reader designs open interesting opportunities for mobile engagement that few developers are thinking about.

Disclosure: I'm the founder of Flomio, Inc., a TechStars company that delivers proximity ID hardware, software, and services for applications ranging from access control to payments.

Update: This rumor, if true, would open up the possibility for the iPhone to practically support NFC tag Discovery mode. An all glass design would not interfere with the NFC antenna as does the metal back of the current iPhone. We've attempted this design approach --albeit with cheaper materials-- on some of our custom reader designs with success so looking forward to this improvement.

Update: iOS11 has announced support for "NFC reader mode" for iPhone7/7+. Details here. API only supports reading NDEF messages (no ISO7816 APDUs) while an app is in the foreground (no background detection). Due out in the Fall, 2017... check the screenshot from WWDC keynote:

How to set TLS version on apache HttpClient

This is how I got it working on httpClient 4.5 (as per Olive Tree request):

CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
        new AuthScope(AuthScope.ANY_HOST, 443),
        new UsernamePasswordCredentials(this.user, this.password));

SSLContext sslContext = SSLContexts.createDefault();

SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext,
        new String[]{"TLSv1", "TLSv1.1"},
        null,
        new NoopHostnameVerifier());

CloseableHttpClient httpclient = HttpClients.custom()
        .setDefaultCredentialsProvider(credsProvider)
        .setSSLSocketFactory(sslsf)
        .build();

return httpclient;

How do I scroll to an element using JavaScript?

In case you want to use html, you could just use this:

a href="samplewebsite.com/subdivision.html#id

and make it an html link to the specific element id. Its basically getElementById html version.

Apache won't follow symlinks (403 Forbidden)

I was having a similar problem that I could not resolve for a long time on my new server. In addition to palacsint's answer, a good question to ask is: are you using Apache 2.4? In Apache 2.4 there is a different mechanism for setting the permissions that do not work when done using the above configuration, so I used the solution explained in this blog post.

Basically, what I needed to do was convert my config file from:

Alias /demo /usr/demo/html

<Directory "/usr/demo/html">
    Options FollowSymLinks
    AllowOverride None
    Order allow,deny
    allow from all

</Directory>

to:

Alias /demo /usr/demo/html

<Directory "/usr/demo/html">
    Options FollowSymLinks
    AllowOverride None
    Require all granted
</Directory>

Note how the Order and allow lines have been replaced by Require all granted

python: how to get information about a function?

In python: help(my_list.append) for example, will give you the docstring of the function.

>>> my_list = []
>>> help(my_list.append)

    Help on built-in function append:

    append(...)
        L.append(object) -- append object to end

How do I do a Date comparison in Javascript?

if (date1.getTime() > date2.getTime()) {
    alert("The first date is after the second date!");
}

Reference to Date object

Retrieve a single file from a repository

Yisrael Dov's answer is the straightforward one, but it doesn't allow compression. You can use --format=zip, but you can't directly unzip that with a pipe command like you can with tar, so you need to save it as a temporary file. Here's a script:

#!/bin/bash

BASENAME=$0

function usage {
    echo "usage: $BASENAME <remote-repo> <file> ..."
    exit 1
}

[ 2 -gt "$#" ] && { usage; }

REPO=$1
shift
FILES=$@

TMPFILE=`mktemp`.zip
git archive -9 --remote=$REPO HEAD $FILES -o $TMPFILE
unzip $TMPFILE
rm $TMPFILE

This works with directories too.

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.
}

C# Help reading foreign characters using StreamReader

I solved my problem of reading portuguese characters, changing the source file on notepad++.

enter image description here

    var url = System.Web.HttpContext.Current.Server.MapPath(@"~/Content/data.json");
    string s = string.Empty;
    using (System.IO.StreamReader sr = new System.IO.StreamReader(url, System.Text.Encoding.UTF8,true))
    {
          s = sr.ReadToEnd();
    }

Excel Formula to SUMIF date falls in particular month

=SUMPRODUCT( (MONTH($A$2:$A$6)=1) * ($B$2:$B$6) )

Explanation:

(MONTH($A$2:$A$6)=1) creates an array of 1 and 0, it's 1 when the month is january, thus in your example the returned array would be [1, 1, 1, 0, 0]
SUMPRODUCT first multiplies each value of the array created in the above step with values of the array ($B$2:$B$6), then it sums them. Hence in your example it does this: (1 * 430) + (1 * 96) + (1 * 440) + (0 * 72.10) + (0 * 72.30)

This works also in OpenOffice and Google Spreadsheets

Pandas - Get first row value of a given column

df.iloc[0].head(1) - First data set only from entire first row.
df.iloc[0] - Entire First row in column.

Opening a CHM file produces: "navigation to the webpage was canceled"

"unblocking" the file fixes the problem. Screenshot:

enter image description here

dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib error running php after installing node with brew on Mac

Leland's answer worked for me, but I had to change steps 4 and 6 to:

4) git checkout -B icu4c-62.1 575eb4b

6) brew reinstall Formula/icu4c.rb

Aggregate a dataframe on a given column and display another column

A base R solution is to combine the output of aggregate() with a merge() step. I find the formula interface to aggregate() a little more useful than the standard interface, partly because the names on the output are nicer, so I'll use that:

The aggregate() step is

maxs <- aggregate(Score ~ Group, data = dat, FUN = max)

and the merge() step is simply

merge(maxs, dat)

This gives us the desired output:

R> maxs <- aggregate(Score ~ Group, data = dat, FUN = max)
R> merge(maxs, dat)
  Group Score Info
1     1     3    c
2     2     4    d

You could, of course, stick this into a one-liner (the intermediary step was more for exposition):

merge(aggregate(Score ~ Group, data = dat, FUN = max), dat)

The main reason I used the formula interface is that it returns a data frame with the correct names for the merge step; these are the names of the columns from the original data set dat. We need to have the output of aggregate() have the correct names so that merge() knows which columns in the original and aggregated data frames match.

The standard interface gives odd names, whichever way you call it:

R> aggregate(dat$Score, list(dat$Group), max)
  Group.1 x
1       1 3
2       2 4
R> with(dat, aggregate(Score, list(Group), max))
  Group.1 x
1       1 3
2       2 4

We can use merge() on those outputs, but we need to do more work telling R which columns match up.

Using switch statement with a range of value in each case?

The closest you can get to that kind of behavior with switch statements is

switch (num) {
case 1:
case 2:
case 3:
case 4:
case 5:
     System.out.println("1 through 5");
     break;
case 6:
case 7:
case 8:
case 9:
case 10:
     System.out.println("6 through 10");
     break;
}

Use if statements.

What is a C++ delegate?

An option for delegates in C++ that is not otherwise mentioned here is to do it C style using a function ptr and a context argument. This is probably the same pattern that many asking this question are trying to avoid. But, the pattern is portable, efficient, and is usable in embedded and kernel code.

class SomeClass
{
    in someMember;
    int SomeFunc( int);

    static void EventFunc( void* this__, int a, int b, int c)
    {
        SomeClass* this_ = static_cast< SomeClass*>( this__);

        this_->SomeFunc( a );
        this_->someMember = b + c;
    }
};

void ScheduleEvent( void (*delegateFunc)( void*, int, int, int), void* delegateContext);

    ...
    SomeClass* someObject = new SomeObject();
    ...
    ScheduleEvent( SomeClass::EventFunc, someObject);
    ...

Laravel use same form for create and edit

For example, your controller, retrive data and put the view

class ClassExampleController extends Controller
{

    public function index()
    {   

        $test = Test::first(1);

        return view('view-form',[
            'field' => $test,
        ]);
    }
}

Add default value in the same form, create and edit, is very simple

<!-- view-form file -->
<form action="{{ 
    isset($field) ? 
    @route('field.updated', $field->id) : 
    @route('field.store')
}}">
    <!-- Input case -->
    <input name="name_input" class="form-control" 
    value="{{ isset($field->name) ? $field->name : '' }}">
</form>

And, you remember add csrf_field, in case a POST method requesting. Therefore, repeat input, and select element, compare each option

<select name="x_select">
@foreach($field as $subfield)

    @if ($subfield == $field->name)
        <option val="i" checked>
    @else
        <option val="i" >
    @endif

@endforeach
</select>

How to start an Intent by passing some parameters to it?

In order to pass the parameters you create new intent and put a parameter map:

Intent myIntent = new Intent(this, NewActivityClassName.class);
myIntent.putExtra("firstKeyName","FirstKeyValue");
myIntent.putExtra("secondKeyName","SecondKeyValue");
startActivity(myIntent);

In order to get the parameters values inside the started activity, you must call the get[type]Extra() on the same intent:

// getIntent() is a method from the started activity
Intent myIntent = getIntent(); // gets the previously created intent
String firstKeyName = myIntent.getStringExtra("firstKeyName"); // will return "FirstKeyValue"
String secondKeyName= myIntent.getStringExtra("secondKeyName"); // will return "SecondKeyValue"

If your parameters are ints you would use getIntExtra() instead etc. Now you can use your parameters like you normally would.

What is the non-jQuery equivalent of '$(document).ready()'?

A little thing I put together

domready.js

(function(exports, d) {
  function domReady(fn, context) {

    function onReady(event) {
      d.removeEventListener("DOMContentLoaded", onReady);
      fn.call(context || exports, event);
    }

    function onReadyIe(event) {
      if (d.readyState === "complete") {
        d.detachEvent("onreadystatechange", onReadyIe);
        fn.call(context || exports, event);
      }
    }

    d.addEventListener && d.addEventListener("DOMContentLoaded", onReady) ||
    d.attachEvent      && d.attachEvent("onreadystatechange", onReadyIe);
  }

  exports.domReady = domReady;
})(window, document);

How to use it

<script src="domready.js"></script>
<script>
  domReady(function(event) {
    alert("dom is ready!");
  });
</script>

You can also change the context in which the callback runs by passing a second argument

function init(event) {
  alert("check the console");
  this.log(event);
}

domReady(init, console);

How to get image width and height in OpenCV?

Also for openCV in python you can do:

img = cv2.imread('myImage.jpg')
height, width, channels = img.shape

Error "The connection to adb is down, and a severe error has occurred."

Open up the Windows task manager, kill the process named adb.exe, and re-launch your program.

Formatting struct timespec

One way to format it is:

printf("%lld.%.9ld", (long long)ts.tv_sec, ts.tv_nsec);

Creating a list of objects in Python

You demonstrate a fundamental misunderstanding.

You never created an instance of SimpleClass at all, because you didn't call it.

for count in xrange(4):
    x = SimpleClass()
    x.attr = count
    simplelist.append(x)

Or, if you let the class take parameters, instead, you can use a list comprehension.

simplelist = [SimpleClass(count) for count in xrange(4)]

Remove the legend on a matplotlib figure

you have to add the following lines of code:

ax = gca()
ax.legend_ = None
draw()

gca() returns the current axes handle, and has that property legend_

How can I make Bootstrap 4 columns all the same height?

Equal height columns is the default behaviour for Bootstrap 4 grids.

_x000D_

.col { background: red; }_x000D_
.col:nth-child(odd) { background: yellow; }

_x000D_

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">_x000D_
_x000D_
<div class="container">_x000D_
  <div class="row">_x000D_
    <div class="col">_x000D_
      1 of 3_x000D_
    </div>_x000D_
    <div class="col">_x000D_
      1 of 3_x000D_
      <br>_x000D_
      Line 2_x000D_
      <br>_x000D_
      Line 3_x000D_
    </div>_x000D_
    <div class="col">_x000D_
      1 of 3_x000D_
    </div>_x000D_
  </div>_x000D_
</div>

_x000D_

#pragma pack effect

A compiler may place structure members on particular byte boundaries for reasons of performance on a particular architecture. This may leave unused padding between members. Structure packing forces members to be contiguous.

This may be important for example if you require a structure to conform to a particular file or communications format where the data you need the data to be at specific positions within a sequence. However such usage does not deal with endian-ness issues, so although used, it may not be portable.

It may also to exactly overlay the internal register structure of some I/O device such as a UART or USB controller for example, in order that register access be through a structure rather than direct addresses.

Better naming in Tuple classes than "Item1", "Item2"

(double, int) t1 = (4.5, 3);
Console.WriteLine($"Tuple with elements {t1.Item1} and {t1.Item2}.");
// Output:
// Tuple with elements 4.5 and 3.

(double Sum, int Count) t2 = (4.5, 3);
Console.WriteLine($"Sum of {t2.Count} elements is {t2.Sum}.");
// Output:
// Sum of 3 elements is 4.5.
From Docs https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/builtin-types/value-tuples

How can I capture the result of var_dump to a string?

Try `var_export`

You may want to check out var_export — while it doesn't provide the same output as var_dump it does provide a second $return parameter which will cause it to return its output rather than print it:

$debug = var_export($my_var, true);

Why?

I prefer this one-liner to using ob_start and ob_get_clean(). I also find that the output is a little easier to read, since it's just PHP code.

The difference between var_dump and var_export is that var_export returns a "parsable string representation of a variable" while var_dump simply dumps information about a variable. What this means in practice is that var_export gives you valid PHP code (but may not give you quite as much information about the variable, especially if you're working with resources).

Demo:

$demo = array(
    "bool" => false,
    "int" => 1,
    "float" => 3.14,
    "string" => "hello world",
    "array" => array(),
    "object" => new stdClass(),
    "resource" => tmpfile(),
    "null" => null,
);

// var_export -- nice, one-liner
$debug_export = var_export($demo, true);

// var_dump
ob_start();
var_dump($demo);
$debug_dump = ob_get_clean();

// print_r -- included for completeness, though not recommended
$debug_printr = print_r($demo, true);

The difference in output:

var_export (`$debug_export` in above example):

 array (
  'bool' => false,
  'int' => 1,
  'float' => 3.1400000000000001,
  'string' => 'hello world',
  'array' => 
  array (
  ),
  'object' => 
  stdClass::__set_state(array(
  )),
  'resource' => NULL, // Note that this resource pointer is now NULL
  'null' => NULL,
)

var_dump (`$debug_dump` in above example):

 array(8) {
  ["bool"]=>
  bool(false)
  ["int"]=>
  int(1)
  ["float"]=>
  float(3.14)
  ["string"]=>
  string(11) "hello world"
  ["array"]=>
  array(0) {
  }
  ["object"]=>
  object(stdClass)#1 (0) {
  }
  ["resource"]=>
  resource(4) of type (stream)
  ["null"]=>
  NULL
}

print_r (`$debug_printr` in above example):

Array
(
    [bool] => 
    [int] => 1
    [float] => 3.14
    [string] => hello world
    [array] => Array
        (
        )

    [object] => stdClass Object
        (
        )

    [resource] => Resource id #4
    [null] => 
)

Caveat: `var_export` does not handle circular references

If you're trying to dump a variable with circular references, calling var_export will result in a PHP warning:

 $circular = array();
 $circular['self'] =& $circular;
 var_export($circular);

Results in:

 Warning: var_export does not handle circular references in example.php on line 3
 array (
   'self' => 
   array (
     'self' => NULL,
   ),
 )

Both var_dump and print_r, on the other hand, will output the string *RECURSION* when encountering circular references.

Checking network connection

import urllib

def connected(host='http://google.com'):
    try:
        urllib.urlopen(host)
        return True
    except:
        return False

# test
print( 'connected' if connected() else 'no internet!' )

For python 3, use urllib.request.urlopen(host)

The difference between sys.stdout.write and print?

print first converts the object to a string (if it is not already a string). It will also put a space before the object if it is not the start of a line and a newline character at the end.

When using stdout, you need to convert the object to a string yourself (by calling "str", for example) and there is no newline character.

print 99

is equivalent to:

import sys
sys.stdout.write(str(99) + '\n')

ToList()-- does it create a new list?

The accepted answer correctly addresses the OP's question based on his example. However, it only applies when ToList is applied to a concrete collection; it does not hold when the elements of the source sequence have yet to be instantiated (due to deferred execution). In case of the latter, you might get a new set of items each time you call ToList (or enumerate the sequence).

Here is an adaptation of the OP's code to demonstrate this behaviour:

public static void RunChangeList()
{
    var objs = Enumerable.Range(0, 10).Select(_ => new MyObject() { SimpleInt = 0 });
    var whatInt = ChangeToList(objs);   // whatInt gets 0
}

public static int ChangeToList(IEnumerable<MyObject> objects)
{
    var objectList = objects.ToList();
    objectList.First().SimpleInt = 5;
    return objects.First().SimpleInt;
}

Whilst the above code may appear contrived, this behaviour can appear as a subtle bug in other scenarios. See my other example for a situation where it causes tasks to get spawned repeatedly.

Generating random numbers in C

Or, to get a pseudo-random int in the range 0 to 19, for example, you could use the higher bits like this:

j = ((rand() >> 15) % 20;

Base64: java.lang.IllegalArgumentException: Illegal character

I got this error for my Linux Jenkins slave. I fixed it by changing from the node from "Known hosts file Verification Strategy" to "Non verifying Verification Strategy".

New to unit testing, how to write great tests?

It's worth noting that retro-fitting unit tests into existing code is far more difficult than driving the creation of that code with tests in the first place. That's one of the big questions in dealing with legacy applications... how to unit test? This has been asked many times before (so you may be closed as a dupe question), and people usually end up here:

Moving existing code to Test Driven Development

I second the accepted answer's book recommendation, but beyond that there's more information linked in the answers there.

What does the "undefined reference to varName" in C mean?

You need to link both a.o and b.o:

gcc -o program a.c b.c

If you have a main() in each file, you cannot link them together.

However, your a.c file contains a reference to doSomething() and expects to be linked with a source file that defines doSomething() and does not define any function that is defined in a.c (such as main()).

You cannot call a function in Process B from Process A. You cannot send a signal to a function; you send signals to processes, using the kill() system call.

The signal() function specifies which function in your current process (program) is going to handle the signal when your process receives the signal.

You have some serious work to do understanding how this is going to work - how ProgramA is going to know which process ID to send the signal to. The code in b.c is going to need to call signal() with dosomething as the signal handler. The code in a.c is simply going to send the signal to the other process.

How to amend older Git commit?

You could can use git rebase to rewrite the commit history. This can be potentially destructive to your changes, so use with care.

First commit your "amend" change as a normal commit. Then do an interactive rebase starting on the parent of your oldest commit

git rebase -i 47175e84c2cb7e47520f7dde824718eae3624550^

This will fire up your editor with all commits. Reorder them so your "amend" commit comes below the one you want to amend. Then replace the first word on the line with the "amend" commit with s which will combine (s quash) it with the commit before. Save and exit your editor and follow the instructions.

How does Google calculate my location on a desktop?

It's a lot more simple that you think. You've signed into both your mobile and Chrome on your desktop using the same Google account. Google simply expect you will have your mobile with you most of the time. They take the location data from your phone and assume the location of your current desktop session is the same.

I proved this by RDPing into my Windows machine at home from work and checking Google maps remotely. It show my location as the same as Chrome on Linux at work.

If you don't have a mobile that is signed into Google then all they can do is lookup GeoIP data for the IP address assigned by your ISP. It will typically be wildly inaccurate.

Get Hard disk serial Number

Here's some code that may help:

ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");

string serial_number="";

foreach (ManagementObject wmi_HD in searcher.Get())
{
    serial_number = wmi_HD["SerialNumber"].ToString();
}

MessageBox.Show(serial_number);

Maven build debug in Eclipse

Easiest way I find is to:

Right click project
Debug as -> Maven build ...
In the goals field put -Dmaven.surefire.debug test
In the parameters put a new parameter called forkCount with a value of 0 (previously was forkMode=never but it is deprecated and doesn't work anymore)

Set your breakpoints down and run this configuration and it should hit the breakpoint.

Is there a way to get the source code from an APK file?

Android studio offers you to analyse any apk file.

1 - From build menu choose analyse apk option and select apk file. 2 - This will result in you the classes.dex file and other files. 3 - Click on classes.dex which will give you the list of folders, packages, libraries and files. 4 - From and android studio settings install a plugin called "Dex to Jar" 5 - click on any activity file of your extracted project and choose dex to jar from the build menu.

This will result in you the actual code of your java file.

Cheers.

Is there a limit to the length of a GET request?

This article sums it up pretty well

Summary: It's implementation dependent, as there is no specified limit in the RFC. It'd be safe to use up to 2000 characters (IE's limit.) If you are anywhere near this length, you should make sure you really need URIs that long, maybe an alternative design could get around that.

URIs should be readable, even when used to send data.

how to remove json object key and value.?

delete operator is used to remove an object property.

delete operator does not returns the new object, only returns a boolean: true or false.

In the other hand, after interpreter executes var updatedjsonobj = delete myjsonobj['otherIndustry']; , updatedjsonobj variable will store a boolean value.

How to remove Json object specific key and its value ?

You just need to know the property name in order to delete it from the object's properties.

delete myjsonobj['otherIndustry'];

_x000D_

let myjsonobj = {
  "employeeid": "160915848",
  "firstName": "tet",
  "lastName": "test",
  "email": "[email protected]",
  "country": "Brasil",
  "currentIndustry": "aaaaaaaaaaaaa",
  "otherIndustry": "aaaaaaaaaaaaa",
  "currentOrganization": "test",
  "salary": "1234567"
}
delete myjsonobj['otherIndustry'];
console.log(myjsonobj);

_x000D_

If you want to remove a key when you know the value you can use Object.keys function which returns an array of a given object's own enumerable properties.

_x000D_

let value="test";
let myjsonobj = {
      "employeeid": "160915848",
      "firstName": "tet",
      "lastName": "test",
      "email": "[email protected]",
      "country": "Brasil",
      "currentIndustry": "aaaaaaaaaaaaa",
      "otherIndustry": "aaaaaaaaaaaaa",
      "currentOrganization": "test",
      "salary": "1234567"
}
Object.keys(myjsonobj).forEach(function(key){
  if (myjsonobj[key] === value) {
    delete myjsonobj[key];
  }
});
console.log(myjsonobj);

_x000D_

Excel 2010: how to use autocomplete in validation list

As other people suggested, you need to use a combobox. However, most tutorials show you how to set up just one combobox and the process is quite tedious.

As I faced this problem before when entering a large amount of data from a list, I can suggest you use this autocomplete add-in . It helps you create the combobox on any cells you select and you can define a list to appear in the dropdown.

How to plot a subset of a data frame in R?

This chunk should do the work:

plot(var2 ~ var1, data=subset(dataframe, var3 < 150))

My best regards.

How this works:

Fisrt, we make selection using the subset function. Other possibilities can be used, like, subset(dataframe, var4 =="some" & var5 > 10). The "&" operator can be used to select all "some" and over 10. Also the operator "|" could be used to select "some" or "over 10".
The next step is to plot the results of the subset, using tilde (~) operator, that just imply a formula, in this case var.response ~ var.independet. Of course this is not a formula, but works great for this case.

Getting a directory name from a filename

_splitpath is a nice CRT solution.

MySQL: Enable LOAD DATA LOCAL INFILE

Another way is to use the mysqlimport client program.

You invoke it as follows:

mysqlimport -uTheUsername -pThePassword --local yourDatabaseName tableName.txt

This generates a LOAD DATA statement which loads tableName.txt into the tableName table.

Keep in mind the following:

mysqlimport determines the table name from the file you provide; using all text from the start of the file name up to the first period as the table name. So, if you wish to load several files to the same table you could distinguish them like tableName.1.txt, tableName.2.txt,..., etc, for example.

how to call a function from another function in Jquery

I assume you don't want to rebind the event, but call the handler.

You can use trigger() to trigger events:

$('#billing_state_id').trigger('change');

If your handler doesn't rely on the event context and you don't want to trigger other handlers for the event, you could also name the function:

function someFunction() {
    //do stuff
}

$(document).ready(function(){
    //Load City by State
    $('#billing_state_id').live('change', someFunction);   
    $('#click_me').live('click', function() {
       //do something
       someFunction();
    });
  });

Also note that live() is deprecated, on() is the new hotness.

How to concat two ArrayLists?

One ArrayList1 add to data,

mArrayList1.add(data);

and Second ArrayList2 to add other data,

mArrayList2.addAll(mArrayList1);

How to delete from a text file, all lines that contain a specific string?

I have made a small benchmark with a file which contains approximately 345 000 lines. The way with grep seems to be around 15 times faster than the sed method in this case.

I have tried both with and without the setting LC_ALL=C, it does not seem change the timings significantly. The search string (CDGA_00004.pdbqt.gz.tar) is somewhere in the middle of the file.

Here are the commands and the timings:

time sed -i "/CDGA_00004.pdbqt.gz.tar/d" /tmp/input.txt

real    0m0.711s
user    0m0.179s
sys     0m0.530s

time perl -ni -e 'print unless /CDGA_00004.pdbqt.gz.tar/' /tmp/input.txt

real    0m0.105s
user    0m0.088s
sys     0m0.016s

time (grep -v CDGA_00004.pdbqt.gz.tar /tmp/input.txt > /tmp/input.tmp; mv /tmp/input.tmp /tmp/input.txt )

real    0m0.046s
user    0m0.014s
sys     0m0.019s

Python Decimals format

If you have Python 2.6 or newer, use format:

'{0:.3g}'.format(num)

For Python 2.5 or older:

'%.3g'%(num)

Explanation:

{0}tells format to print the first argument -- in this case, num.

Everything after the colon (:) specifies the format_spec.

.3 sets the precision to 3.

g removes insignificant zeros. See http://en.wikipedia.org/wiki/Printf#fprintf

For example:

tests=[(1.00, '1'),
       (1.2, '1.2'),
       (1.23, '1.23'),
       (1.234, '1.23'),
       (1.2345, '1.23')]

for num, answer in tests:
    result = '{0:.3g}'.format(num)
    if result != answer:
        print('Error: {0} --> {1} != {2}'.format(num, result, answer))
        exit()
    else:
        print('{0} --> {1}'.format(num,result))

yields

1.0 --> 1
1.2 --> 1.2
1.23 --> 1.23
1.234 --> 1.23
1.2345 --> 1.23

Using Python 3.6 or newer, you could use f-strings:

In [40]: num = 1.234; f'{num:.3g}'
Out[40]: '1.23'

converting string to long in python

longcan only take string convertibles which can end in a base 10 numeral. So, the decimal is causing the harm. What you can do is, float the value before calling the long. If your program is on Python 2.x where int and long difference matters, and you are sure you are not using large integers, you could have just been fine with using int to provide the key as well.

So, the answer is long(float('234.89')) or it could just be int(float('234.89')) if you are not using large integers. Also note that this difference does not arise in Python 3, because int is upgraded to long by default. All integers are long in python3 and call to covert is just int

String comparison in Objective-C

You can compare string with below functions.

NSString *first = @"abc";
NSString *second = @"abc";
NSString *third = [[NSString alloc] initWithString:@"abc"];
NSLog(@"%d", (second == third))  
NSLog(@"%d", (first == second)); 
NSLog(@"%d", [first isEqualToString:second]); 
NSLog(@"%d", [first isEqualToString:third]); 

Output will be :-
    0
    1
    1
    1

How to add a second css class with a conditional value in razor MVC 4

I believe that there can still be and valid logic on views. But for this kind of things I agree with @BigMike, it is better placed on the model. Having said that the problem can be solved in three ways:

Your answer (assuming this works, I haven't tried this):

<div class="details @(@Model.Details.Count > 0 ? "show" : "hide")">

Second option:

@if (Model.Details.Count > 0) {
    <div class="details show">
}
else {
    <div class="details hide">
}

Third option:

<div class="@("details " + (Model.Details.Count>0 ? "show" : "hide"))">

Entity Framework 6 Code first Default value

It's been a while, but leaving a note for others. I achieved what is needed with an attribute and I decorated my model class fields with that attribute as I want.

[SqlDefaultValue(DefaultValue = "getutcdate()")]
public DateTime CreatedDateUtc { get; set; }

Got the help of these 2 articles:

What I did:

Define Attribute

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class SqlDefaultValueAttribute : Attribute
{
    public string DefaultValue { get; set; }
}

In the "OnModelCreating" of the context

modelBuilder.Conventions.Add( new AttributeToColumnAnnotationConvention<SqlDefaultValueAttribute, string>("SqlDefaultValue", (p, attributes) => attributes.Single().DefaultValue));

In the custom SqlGenerator

private void SetAnnotatedColumn(ColumnModel col)
{
    AnnotationValues values;
    if (col.Annotations.TryGetValue("SqlDefaultValue", out values))
    {
         col.DefaultValueSql = (string)values.NewValue;
    }
}

Then in the Migration Configuration constructor, register the custom SQL generator.

SetSqlGenerator("System.Data.SqlClient", new CustomMigrationSqlGenerator());

How can I do time/hours arithmetic in Google Spreadsheet?

You can use the function TIME(h,m,s) of google spreadsheet. If you want to add times to each other (or other arithmetic operations), you can specify either a cell, or a call to TIME, for each input of the formula.

For example:

B3 = 10:45
C3 = 20 (minutes)
D3 = 15 (minutes)
E3 = 8 (hours)
F3 = B3+time(E3,C3+D3,0) equals 19:20

Dynamically Add Images React Webpack

If you are looking for a way to import all your images from the image

// Import all images in image folder
function importAll(r) {
    let images = {};
    r.keys().map((item, index) => { images[item.replace('./', '')] = r(item); });
    return images;
}

const images = importAll(require.context('../images', false, /\.(gif|jpe?g|svg)$/));

Then:

<img src={images['image-01.jpg']}/>

You can find the original thread here: Dynamically import images from a directory using webpack

How to retrieve records for last 30 minutes in MS SQL?

Remember that CURRENT_TIMESTAMP - (number) works fine, but that you need to understand what number it is looking for - it is floating-point number of days. So CURRENT_TIMESTAMP-1.0 is 1 day ago, CURRENT_TIMESTAMP-0.5 is 1/2 day ago. For 30 minutes, that is 1.0/48.0 (use radix so result is a floating point number) or 0.0208333333333333, so your query will work if re-written as

select * from
[Janus999DB].[dbo].[tblCustomerPlay]
where DatePlayed < CURRENT_TIMESTAMP
and DatePlayed >
CURRENT_TIMESTAMP-1.0/48.0

You could also use 1.0/24.0/2.0 if that looks more like 1/2 hour to you.

CSS I want a div to be on top of everything

z-index property enables you to take your control at front. the bigger number you set the upper your element you get.

position property should be relative because position of html-element should be position relatively against other controls in all dimensions.

element.style {
   position:relative;
   z-index:1000; //change your number as per elements lies on your page.
}

How can I tell when HttpClient has timed out?

I found that the best way to determine if the service call has timed out is to use a cancellation token and not the HttpClient's timeout property:

var cts = new CancellationTokenSource();
cts.CancelAfter(timeout);

And then handle the CancellationException during the service call...

catch(TaskCanceledException)
{
    if(!cts.Token.IsCancellationRequested)
    {
        // Timed Out
    }
    else
    {
        // Cancelled for some other reason
    }
}

Of course if the timeout occurs on the service side of things, that should be able to handled by a WebException.

How can I find the number of arguments of a Python function?

Good news for folks who want to do this in a portable way between Python 2 and Python 3.6+: use inspect.getfullargspec() method. It works in both Python 2.x and 3.6+

As Jim Fasarakis Hilliard and others have pointed out, it used to be like this:
1. In Python 2.x: use inspect.getargspec()
2. In Python 3.x: use signature, as getargspec() and getfullargspec() were deprecated.

However, starting Python 3.6 (by popular demand?), things have changed towards better:

From the Python 3 documentation page:

inspect.getfullargspec(func)

Changed in version 3.6: This method was previously documented as deprecated in favour of signature() in Python 3.5, but that decision has been reversed in order to restore a clearly supported standard interface for single-source Python 2/3 code migrating away from the legacy getargspec() API.

Faster way to zero memory than with memset?

That's an interesting question. I made this implementation that is just slightly faster (but hardly measurable) when 32-bit release compiling on VC++ 2012. It probably can be improved on a lot. Adding this in your own class in a multithreaded environment would probably give you even more performance gains since there are some reported bottleneck problems with memset() in multithreaded scenarios.

// MemsetSpeedTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include "Windows.h"
#include <time.h>

#pragma comment(lib, "Winmm.lib") 
using namespace std;

/** a signed 64-bit integer value type */
#define _INT64 __int64

/** a signed 32-bit integer value type */
#define _INT32 __int32

/** a signed 16-bit integer value type */
#define _INT16 __int16

/** a signed 8-bit integer value type */
#define _INT8 __int8

/** an unsigned 64-bit integer value type */
#define _UINT64 unsigned _INT64

/** an unsigned 32-bit integer value type */
#define _UINT32 unsigned _INT32

/** an unsigned 16-bit integer value type */
#define _UINT16 unsigned _INT16

/** an unsigned 8-bit integer value type */
#define _UINT8 unsigned _INT8

/** maximum allo

wed value in an unsigned 64-bit integer value type */
    #define _UINT64_MAX 18446744073709551615ULL

#ifdef _WIN32

/** Use to init the clock */
#define TIMER_INIT LARGE_INTEGER frequency;LARGE_INTEGER t1, t2;double elapsedTime;QueryPerformanceFrequency(&frequency);

/** Use to start the performance timer */
#define TIMER_START QueryPerformanceCounter(&t1);

/** Use to stop the performance timer and output the result to the standard stream. Less verbose than \c TIMER_STOP_VERBOSE */
#define TIMER_STOP QueryPerformanceCounter(&t2);elapsedTime=(t2.QuadPart-t1.QuadPart)*1000.0/frequency.QuadPart;wcout<<elapsedTime<<L" ms."<<endl;
#else
/** Use to init the clock */
#define TIMER_INIT clock_t start;double diff;

/** Use to start the performance timer */
#define TIMER_START start=clock();

/** Use to stop the performance timer and output the result to the standard stream. Less verbose than \c TIMER_STOP_VERBOSE */
#define TIMER_STOP diff=(clock()-start)/(double)CLOCKS_PER_SEC;wcout<<fixed<<diff<<endl;
#endif    


void *MemSet(void *dest, _UINT8 c, size_t count)
{
    size_t blockIdx;
    size_t blocks = count >> 3;
    size_t bytesLeft = count - (blocks << 3);
    _UINT64 cUll = 
        c 
        | (((_UINT64)c) << 8 )
        | (((_UINT64)c) << 16 )
        | (((_UINT64)c) << 24 )
        | (((_UINT64)c) << 32 )
        | (((_UINT64)c) << 40 )
        | (((_UINT64)c) << 48 )
        | (((_UINT64)c) << 56 );

    _UINT64 *destPtr8 = (_UINT64*)dest;
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr8[blockIdx] = cUll;

    if (!bytesLeft) return dest;

    blocks = bytesLeft >> 2;
    bytesLeft = bytesLeft - (blocks << 2);

    _UINT32 *destPtr4 = (_UINT32*)&destPtr8[blockIdx];
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr4[blockIdx] = (_UINT32)cUll;

    if (!bytesLeft) return dest;

    blocks = bytesLeft >> 1;
    bytesLeft = bytesLeft - (blocks << 1);

    _UINT16 *destPtr2 = (_UINT16*)&destPtr4[blockIdx];
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr2[blockIdx] = (_UINT16)cUll;

    if (!bytesLeft) return dest;

    _UINT8 *destPtr1 = (_UINT8*)&destPtr2[blockIdx];
    for (blockIdx = 0; blockIdx < bytesLeft; blockIdx++) destPtr1[blockIdx] = (_UINT8)cUll;

    return dest;
}

int _tmain(int argc, _TCHAR* argv[])
{
    TIMER_INIT

    const size_t n = 10000000;
    const _UINT64 m = _UINT64_MAX;
    const _UINT64 o = 1;
    char test[n];
    {
        cout << "memset()" << endl;
        TIMER_START;

        for (int i = 0; i < m ; i++)
            for (int j = 0; j < o ; j++)
                memset((void*)test, 0, n);  

        TIMER_STOP;
    }
    {
        cout << "MemSet() took:" << endl;
        TIMER_START;

        for (int i = 0; i < m ; i++)
            for (int j = 0; j < o ; j++)
                MemSet((void*)test, 0, n);

        TIMER_STOP;
    }

    cout << "Done" << endl;
    int wait;
    cin >> wait;
    return 0;
}

Output is as follows when release compiling for 32-bit systems:

memset() took:
5.569000
MemSet() took:
5.544000
Done

Output is as follows when release compiling for 64-bit systems:

memset() took:
2.781000
MemSet() took:
2.765000
Done

Here you can find the source code Berkley's memset(), which I think is the most common implementation.

Maven dependency for Servlet 3.0 API?

I found an example POM for the Servlet 3.0 API on DZone from September.

Suggest you use the java.net repo, at http://download.java.net/maven/2/

There are Java EE APIs in there, for example http://download.java.net/maven/2/javax/javaee-web-api/6.0/ with POM that look like they might be what you're after, for example:

<dependency>
  <groupId>javax</groupId>
  <artifactId>javaee-web-api</artifactId>
  <version>6.0</version>
</dependency>

I'm guessing that the version conventions for the APIs have been changed to match the version of the overall EE spec (i.e. Java EE 6 vs. Servlets 3.0) as part of the new 'profiles'. Looking in the JAR, looks like all the 3.0 servlet stuff is in there. Enjoy!

Import an Excel worksheet into Access using VBA

Pass the sheet name with the Range parameter of the DoCmd.TransferSpreadsheet Method. See the box titled "Worksheets in the Range Parameter" near the bottom of that page.

This code imports from a sheet named "temp" in a workbook named "temp.xls", and stores the data in a table named "tblFromExcel".

Dim strXls As String
strXls = CurrentProject.Path & Chr(92) & "temp.xls"
DoCmd.TransferSpreadsheet acImport, , "tblFromExcel", _
    strXls, True, "temp!"

How can you remove all documents from a collection with Mongoose?

DateTime.remove({}, callback) The empty object will match all of them.

Characters allowed in GET parameter

Alphanumeric characters and all of

~ - _ . ! * ' ( ) ,

are valid within an URL.

All other characters must be encoded.

Pass a PHP string to a JavaScript variable (and escape newlines)

htmlspecialchars

Description

string htmlspecialchars ( string $string [, int $quote_style [, string $charset [, bool $double_encode ]]] )

Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings. This function returns a string with some of these conversions made; the translations made are those most useful for everyday web programming. If you require all HTML character entities to be translated, use htmlentities() instead.

This function is useful in preventing user-supplied text from containing HTML markup, such as in a message board or guest book application.

The translations performed are:

* '&' (ampersand) becomes '&amp;'
* '"' (double quote) becomes '&quot;' when ENT_NOQUOTES is not set.
* ''' (single quote) becomes '&#039;' only when ENT_QUOTES is set.
* '<' (less than) becomes '&lt;'
* '>' (greater than) becomes '&gt;'

http://ca.php.net/htmlspecialchars

Programs & Examples On #Treelistview

Save ArrayList to SharedPreferences

No internet on Android emulator - why and how to fix?

How to place Text and an Image next to each other in HTML?

CSS: create white glow around image

Error System.Data.OracleClient requires Oracle client software version 8.1.7 or greater when installs setup

What's the difference between Html.Label, Html.LabelFor and Html.LabelForModel

Convert sqlalchemy row object to python dict

Determine the number of NA values in a column

What is the equivalent of ngShow and ngHide in Angular 2+?

Java way to check if a string is palindrome

Refresh page after form submitting

CSS disable hover effect

Outputting data from unit test in Python

How to install a gem or update RubyGems if it fails with a permissions error

JSON - Iterate through JSONArray

Error: getaddrinfo ENOTFOUND in nodejs for get call

Get a CSS value with JavaScript

Java compile error: "reached end of file while parsing }"

How can one pull the (private) data of one's own Android app?

Java BigDecimal: Round to the nearest whole value

Simple PHP calculator

How to center an element horizontally and vertically

Approach 1 - transform translateX/translateY:

Approach 2 - Flexbox method:

Approach 3 - table-cell/vertical-align: middle:

Approach 4 - Absolutely positioned 50% from the top with displacement:

Approach 5 - The line-height method (Least flexible - not suggested):

Clearing a text field on button click

What are the differences between if, else, and else if?

clearing a char array c

CSS filter: make color image with transparency white

What is and how to fix System.TypeInitializationException error?

How do I compare 2 rows from the same table (SQL Server)?

Javascript can't find element by id?

How to set alignment center in TextBox in ASP.NET?

How to check for file lock?

Tar archiving that takes input from a list of files

how to make a countdown timer in java

cv2.imshow command doesn't work properly in opencv-python

Python error message io.UnsupportedOperation: not readable

Null & empty string comparison in Bash

Update GCC on OSX

Can a CSV file have a comment?

Running conda with proxy

Passing Parameters JavaFX FXML

PostgreSQL naming conventions

Get SELECT's value and text in jQuery

How to determine one year from now in Javascript

Mock a constructor with parameter

How can one use multi threading in PHP applications

How to fix: fatal error: openssl/opensslv.h: No such file or directory in RedHat 7

Proper way to initialize C++ structs

Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails

Get combobox value in Java swing

Quick Way to Implement Dictionary in C

Format SQL in SQL Server Management Studio

How to create an Oracle sequence starting with max value from a table?

jQuery get the image src

MongoDB: How to update multiple documents with a single command?

JAVA How to remove trailing zeros from a double

pdftk compression option

Warn user before leaving web page with unsaved changes

How can I set the initial value of Select2 when using AJAX?

Class file has wrong version 52.0, should be 50.0

Find string between two substrings

What is the difference between field, variable, attribute, and property in Java POJOs?

Save Javascript objects in sessionStorage

Return only string message from Spring MVC 3 Controller

Are querystring parameters secure in HTTPS (HTTP + SSL)?

Implementing SearchView in action bar

Get text of label with jquery

Convert JsonObject to String

Test if something is not undefined in JavaScript

How can one develop iPhone apps in Java?

Python pandas: how to specify data types when reading an Excel file?

How can I install packages using pip according to the requirements.txt file from a local directory?

How to stop an app on Heroku?

How do I add a library (android-support-v7-appcompat) in IntelliJ IDEA

How can I run a directive after the dom has finished rendering?

Approach 1 - `transform` `translateX`/`translateY`:

Approach 3 - `table-cell`/`vertical-align: middle`:

Approach 4 - Absolutely positioned `50%` from the top with displacement:

Approach 5 - The `line-height` method (Least flexible - not suggested):