#Jdom | Programs & Examples on Jdom

How to create a XML object from String in Java?

try something like

public static Document loadXML(String xml) throws Exception
{
   DocumentBuilderFactory fctr = DocumentBuilderFactory.newInstance();
   DocumentBuilder bldr = fctr.newDocumentBuilder();
   InputSource insrc = new InputSource(new StringReader(xml));
   return bldr.parse(insrc);
}

SQL Server remove milliseconds from datetime

Try:

SELECT * 
FROM table 
WHERE datetime > 
CONVERT(DATETIME, 
CONVERT(VARCHAR(20), 
CONVERT(DATETIME, '2010-07-20 03:21:52'), 120))

Or if your date is an actual datetime value:

DECLARE @date DATETIME
SET @date = GETDATE()
SELECT CONVERT(DATETIME, CONVERT(VARCHAR(20), @date, 120))

The conversion to style 120 cuts off the milliseconds...

Scanner vs. StringTokenizer vs. String.Split

For the default scenarios I would suggest Pattern.split() as well but if you need maximum performance (especially on Android all solutions I tested are quite slow) and you only need to split by a single char, I now use my own method:

public static ArrayList<String> splitBySingleChar(final char[] s,
        final char splitChar) {
    final ArrayList<String> result = new ArrayList<String>();
    final int length = s.length;
    int offset = 0;
    int count = 0;
    for (int i = 0; i < length; i++) {
        if (s[i] == splitChar) {
            if (count > 0) {
                result.add(new String(s, offset, count));
            }
            offset = i + 1;
            count = 0;
        } else {
            count++;
        }
    }
    if (count > 0) {
        result.add(new String(s, offset, count));
    }
    return result;
}

Use "abc".toCharArray() to get the char array for a String. For example:

String s = "     a bb   ccc  dddd eeeee  ffffff    ggggggg ";
ArrayList<String> result = splitBySingleChar(s.toCharArray(), ' ');

Convert alphabet letters to number in Python

>>> [str(ord(string.lower(c)) - ord('a') + 1) for c in string.letters]
['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17',
'18', '19', '20', '21', '22', '23', '24', '25', '26', '1', '2', '3', '4', '5', '6', '7', '8',
'9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24',
 '25', '26']

Convert and format a Date in JSP

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
 <!DOCTYPE html>
 <html dir="ltr" lang="en-US">
 <head>
 <meta charset="UTF-8" />
  <title>JSP with the current date</title>
  </head>
 <body>
 <%java.text.DateFormat df = new java.text.SimpleDateFormat("dd/MM/yyyy"); %>
<h1>Current Date: <%= df.format(new java.util.Date()) %> </h1>
</body>
</html>

Output: Current Date: 10/03/2010

Convert text to columns in Excel using VBA

Try this

Sub Txt2Col()
    Dim rng As Range

    Set rng = [C7]
    Set rng = Range(rng, Cells(Rows.Count, rng.Column).End(xlUp))

    rng.TextToColumns Destination:=rng, DataType:=xlDelimited, ' rest of your settings

Update: button click event to act on another sheet

Private Sub CommandButton1_Click()
    Dim rng As Range
    Dim sh As Worksheet

    Set sh = Worksheets("Sheet2")
    With sh
        Set rng = .[C7]
        Set rng = .Range(rng, .Cells(.Rows.Count, rng.Column).End(xlUp))

        rng.TextToColumns Destination:=rng, DataType:=xlDelimited, _
        TextQualifier:=xlDoubleQuote,  _
        ConsecutiveDelimiter:=False, _
        Tab:=False, _
        Semicolon:=False, _
        Comma:=True, 
        Space:=False, 
        Other:=False, _
        FieldInfo:=Array(Array(1, xlGeneralFormat), Array(2, xlGeneralFormat), Array(3, xlGeneralFormat)), _
        TrailingMinusNumbers:=True
    End With
End Sub

Note the .'s (eg .Range) they refer to the With statement object

How do I install TensorFlow's tensorboard?

If your Tensorflow install is located here:

/usr/local/lib/python2.7/dist-packages/tensorflow

then the python command to launch Tensorboard is:

$ python /usr/local/lib/python2.7/dist-packages/tensorflow/tensorboard/tensorboard.py --logdir=/home/user/Documents/.../logdir

The installation from pip allows you to use:

$ tensorboard --logdir=/home/user/Documents/.../logdir

How to Programmatically Add Views to Views

You guys should also make sure that when you override onLayout you HAVE to call super.onLayout with all of the properties, or the view will not be inflated!

Laravel: Using try...catch with DB::transaction()

You could wrapping the transaction over try..catch or even reverse them, here my example code I used to in laravel 5,, if you look deep inside DB:transaction() in Illuminate\Database\Connection that the same like you write manual transaction.

Laravel Transaction

public function transaction(Closure $callback)
    {
        $this->beginTransaction();

        try {
            $result = $callback($this);

            $this->commit();
        }

        catch (Exception $e) {
            $this->rollBack();

            throw $e;
        } catch (Throwable $e) {
            $this->rollBack();

            throw $e;
        }

        return $result;
    }

so you could write your code like this, and handle your exception like throw message back into your form via flash or redirect to another page. REMEMBER return inside closure is returned in transaction() so if you return redirect()->back() it won't redirect immediately, because the it returned at variable which handle the transaction.

Wrap Transaction

$result = DB::transaction(function () use ($request, $message) {
   try{

      // execute query 1
      // execute query 2
      // ..

      return redirect(route('account.article'));

   } catch (\Exception $e) {
       return redirect()->back()->withErrors(['error' => $e->getMessage()]);
    }
 });

// redirect the page
return $result;

then the alternative is throw boolean variable and handle redirect outside transaction function or if your need to retrieve why transaction failed you can get it from $e->getMessage() inside catch(Exception $e){...}

PostgreSQL: Show tables in PostgreSQL

use only see a tables

=> \dt

if want to see schema tables

=>\dt+

if you want to see specific schema tables

=>\dt schema_name.*

docker-compose up for only certain containers

One good solution is to run only desired services like this:

docker-compose up --build $(<services.txt)

and services.txt file look like this:

services1 services2, etc

of course if dependancy (depends_on), need to run related services together.

--build is optional, just for example.

"Actual or formal argument lists differs in length"

Say you have defined your class like this:

    @Data
    @AllArgsConstructor(staticName = "of")
    private class Pair<P,Q> {

        public P first;
        public Q second;
    }

So when you will need to create a new instance, it will need to take the parameters and you will provide it like this as defined in the annotation.

Pair<Integer, String> pair = Pair.of(menuItemId, category);

If you define it like this, you will get the error asked for.

Pair<Integer, String> pair = new Pair(menuItemId, category);

Select second last element with css

In CSS3 you have:

:nth-last-child(2)

See: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-child

nth-last-child Browser Support:

Chrome 2

Firefox 3.5

Opera 9.5, 10

Safari 3.1, 4

Internet Explorer 9

jQuery hyperlinks - href value?

you shoud use <a href="javascript:void(0)" ></a> instead of <a href="#" ></a>

How to disable postback on an asp Button (System.Web.UI.WebControls.Button)

You don't say which version of the .NET framework you are using.

If you are using v2.0 or greater you could use the OnClientClick property to execute a Javascript function when the button's onclick event is raised.

All you have to do to prevent a server postback occuring is return false from the called JavaScript function.

When is the finalize() method called in Java?

The Java finalize() method is not a destructor and should not be used to handle logic that your application depends on. The Java spec states there is no guarantee that the finalize method is called at all during the livetime of the application.

What you problably want is a combination of finally and a cleanup method, as in:

MyClass myObj;

try {
    myObj = new MyClass();

    // ...
} finally {
    if (null != myObj) {
        myObj.cleanup();
    }
}

This will correctly handle the situation when the MyClass() constructor throws an exception.

Powershell import-module doesn't find modules

I had this problem, but only in Visual Studio Code, not in ISE. Turns out I was using an x86 session in VSCode. I displayed the PowerShell Session Menu and switched to the x64 session, and all the modules began working without full paths. I am using Version 1.17.2, architecture x64 of VSCode. My modules were stored in the C:\Windows\System32\WindowsPowerShell\v1.0\Modules directory.

How does one convert a HashMap to a List in Java?

If you only want it to iterate over your HashMap, no need for a list:

HashMap<Integer, String> map = new HashMap<Integer, String>();
map.put (1, "Mark");
map.put (2, "Tarryn");
for (String s : map.values()) {
    System.out.println(s);
}

Of course, if you want to modify your map structurally (i.e. more than only changing the value for an existing key) while iterating, then you better use the "copy to ArrayList" method, since otherwise you'll get a ConcurrentModificationException. Or export as an array:

HashMap<Integer, String> map = new HashMap<Integer, String>();
map.put (1, "Mark");
map.put (2, "Tarryn");
for (String s : map.values().toArray(new String[]{})) {
    System.out.println(s);
}

null vs empty string in Oracle

In oracle an empty varchar2 and null are treated the same, and your observations show that.

when you write:

select * from table where a = '';

its the same as writing

select * from table where a = null;

and not a is null

which will never equate to true, so never return a row. same on the insert, a NOT NULL means you cant insert a null or an empty string (which is treated as a null)

How to convert a timezone aware string to datetime in Python without dateutil?

I'm new to Python, but found a way to convert

2017-05-27T07:20:18.000-04:00 to

2017-05-27T07:20:18 without downloading new utilities.

from datetime import datetime, timedelta

time_zone1 = int("2017-05-27T07:20:18.000-04:00"[-6:][:3])
>>returns -04

item_date = datetime.strptime("2017-05-27T07:20:18.000-04:00".replace(".000", "")[:-6], "%Y-%m-%dT%H:%M:%S") + timedelta(hours=-time_zone1)

I'm sure there are better ways to do this without slicing up the string so much, but this got the job done.

Setting max width for body using Bootstrap

I don't know if this was pointed out here. The settings for .container width have to be set on the Bootstrap website. I personally did not have to edit or touch anything within CSS files to tune my .container size which is 1600px. Under Customize tab, there are three sections responsible for media and the responsiveness of the web:

Media queries breakpoints
Grid system
Container sizes

Besides Media queries breakpoints, which I believe most people refer to, I've also changed @container-desktop to (1130px + @grid-gutter-width) and @container-large-desktop to (1530px + @grid-gutter-width). Now, the .container changes its width if my browser is scaled up to ~1600px and ~1200px. Hope it can help.

How to add custom method to Spring Data JPA

If you want to be able to do more sophisticated operations you might need access to Spring Data's internals, in which case the following works (as my interim solution to DATAJPA-422):

public class AccountRepositoryImpl implements AccountRepositoryCustom {

    @PersistenceContext
    private EntityManager entityManager;

    private JpaEntityInformation<Account, ?> entityInformation;

    @PostConstruct
    public void postConstruct() {
        this.entityInformation = JpaEntityInformationSupport.getMetadata(Account.class, entityManager);
    }

    @Override
    @Transactional
    public Account saveWithReferenceToOrganisation(Account entity, long referralId) {
        entity.setOrganisation(entityManager.getReference(Organisation.class, organisationId));
        return save(entity);
    }

    private Account save(Account entity) {
        // save in same way as SimpleJpaRepository
        if (entityInformation.isNew(entity)) {
            entityManager.persist(entity);
            return entity;
        } else {
            return entityManager.merge(entity);
        }
    }

}

How to Create an excel dropdown list that displays text with a numeric hidden value

Data validation drop down

There is a list option in Data validation. If this is combined with a VLOOKUP formula you would be able to convert the selected value into a number.

The steps in Excel 2010 are:

Create your list with matching values.
On the Data tab choose Data Validation
The Data validation form will be displayed
Set the Allow dropdown to List
Set the Source range to the first part of your list
Click on OK (User messages can be added if required)

In a cell enter a formula like this

=VLOOKUP(A2,$D$3:$E$5,2,FALSE)

which will return the matching value from the second part of your list.

Screenshot of Data validation list

Form control drop down

Alternatively, Form controls can be placed on a worksheet. They can be linked to a range and return the position number of the selected value to a specific cell.

The steps in Excel 2010 are:

Create your list of data in a worksheet
Click on the Developer tab and dropdown on the Insert option
In the Form section choose Combo box or List box
Use the mouse to draw the box on the worksheet
Right click on the box and select Format control
The Format control form will be displayed
Click on the Control tab
Set the Input range to your list of data
Set the Cell link range to the cell where you want the number of the selected item to appear
Click on OK

Screenshot of form control

How to return a value from a Form in C#?

delegates are the best option for sending data from one form to another.

public partial class frmImportContact : Form
{
     public delegate void callback_data(string someData);
    public event callback_data getData_CallBack;

    private void button_Click(object sender, EventArgs e)
    {
      string myData = "Top Secret Data To Share";
      getData_CallBack(myData);
    }

}

public partial class frmHireQuote : Form
{
     private void Button_Click(object sender, EventArgs e)
    {

      frmImportContact obj = new frmImportContact();
      obj.getData_CallBack += getData;
    }

    private void getData(string someData)
    {
         MessageBox.Show("someData");
    }
}

Scale image to fit a bounding box

Note: Even though this is the accepted answer, the answer below is more accurate and is currently supported in all browsers if you have the option of using a background image.

No, there is no CSS only way to do this in both directions. You could add

.fillwidth {
    min-width: 100%;
    height: auto;
}

To the an element to always have it 100% width and automatically scale the height to the aspect ratio, or the inverse:

.fillheight {
    min-height: 100%; 
    width: auto;
}

to always scale to max height and relative width. To do both, you will need to determine if the aspect ratio is higher or lower than it's container, and CSS can't do this.

The reason is that CSS does not know what the page looks like. It sets rules beforehand, but only after that it is that the elements get rendered and you know exactly what sizes and ratios you're dealing with. The only way to detect that is with JavaScript.

Although you're not looking for a JS solution I'll add one anyway if someone might need it. The easiest way to handle this with JavaScript is to add a class based on the difference in ratio. If the width-to-height ratio of the box is greater than that of the image, add the class "fillwidth", else add the class "fillheight".

_x000D_

$('div').each(function() {_x000D_
  var fillClass = ($(this).height() > $(this).width()) _x000D_
    ? 'fillheight'_x000D_
    : 'fillwidth';_x000D_
  $(this).find('img').addClass(fillClass);_x000D_
});

_x000D_

.fillwidth { _x000D_
  width: 100%; _x000D_
  height: auto; _x000D_
}_x000D_
.fillheight { _x000D_
  height: 100%; _x000D_
  width: auto; _x000D_
}_x000D_
_x000D_
div {_x000D_
  border: 1px solid black;_x000D_
  overflow: hidden;_x000D_
}_x000D_
_x000D_
.tower {_x000D_
  width: 100px;_x000D_
  height: 200px;_x000D_
}_x000D_
_x000D_
.trailer {_x000D_
  width: 200px;_x000D_
  height: 100px;_x000D_
}

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<div class="tower">_x000D_
  <img src="http://placekitten.com/150/150" />_x000D_
</div>_x000D_
<div class="trailer">_x000D_
  <img src="http://placekitten.com/150/150" />_x000D_
</div>

_x000D_

Sleep function in Windows, using C

Use:

#include <windows.h>

Sleep(sometime_in_millisecs); // Note uppercase S

And here's a small example that compiles with MinGW and does what it says on the tin:

#include <windows.h>
#include <stdio.h>

int main() {
    printf( "starting to sleep...\n" );
    Sleep(3000); // Sleep three seconds
    printf("sleep ended\n");
}

How to get base64 encoded data from html image

You can also use the FileReader class :

    var reader = new FileReader();
    reader.onload = function (e) {
        var data = this.result;
    }
    reader.readAsDataURL( file );

ERROR 1067 (42000): Invalid default value for 'created_at'

First, check existing mode(s) are using the following command in your terminal:

$ mysql -u root -p -e "SHOW VARIABLES LIKE 'sql_mode';"

or

mysql> show variables like 'sql_mode';

You would see an output like below
Disable mode(s) via my.cnf: In this case, you need to remove NO_ZERO_IN_DATE, NO_ZERO_DATE modes

Open my.cnf file (Generally you could find my.cnf file located in /etc/my.cnf or /etc/mysql/my.cnf)

Update modes in my.cnf under [mysqld] heading

sql_mode=ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

Here I have omitted NO_ZERO_IN_DATE, NO_ZERO_DATE modes
Restart mysql server

$ /etc/init.d/mysql restart

Java JDBC connection status

You also can use

public boolean isDbConnected(Connection con) {
    try {
        return con != null && !con.isClosed();
    } catch (SQLException ignored) {}

    return false;
}

Put icon inside input element in a form

You can try this:

input[type='text'] {
    background-image: url(images/comment-author.gif);
    background-position: 7px 7px;
    background-repeat: no-repeat;
}

How to Validate a DateTime in C#?

I would use the DateTime.TryParse() method: http://msdn.microsoft.com/en-us/library/system.datetime.tryparse.aspx

How to check the input is an integer or not in Java?

If you are getting the user input with Scanner, you can do:

if(yourScanner.hasNextInt()) {
    yourNumber = yourScanner.nextInt();
}

If you are not, you'll have to convert it to int and catch a NumberFormatException:

try{
    yourNumber = Integer.parseInt(yourInput);
}catch (NumberFormatException ex) {
    //handle exception here
}

How to select the comparison of two columns as one column in Oracle

I stopped using DECODE several years ago because it is non-portable. Also, it is less flexible and less readable than a CASE/WHEN.

However, there is one neat "trick" you can do with decode because of how it deals with NULL. In decode, NULL is equal to NULL. That can be exploited to tell whether two columns are different as below.

select a, b, decode(a, b, 'true', 'false') as same
  from t;

     A       B  SAME
------  ------  -----
     1       1  true
     1       0  false
     1          false
  null    null  true

How can I stop a running MySQL query?

If you have mysqladmin available, you may get the list of queries with:

> mysqladmin -uUSERNAME -pPASSWORD pr

+-----+------+-----------------+--------+---------+------+--------------+------------------+
| Id  | User | Host            | db     | Command | Time | State        | Info             |
+-----+------+-----------------+--------+---------+------+--------------+------------------+
| 137 | beet | localhost:53535 | people | Query   | 292  | Sending data | DELETE FROM      |
| 145 | root | localhost:55745 |        | Query   | 0    |              | show processlist |
+-----+------+-----------------+--------+---------+------+--------------+------------------+

Then you may stop the mysql process that is hosting the long running query:

> mysqladmin -uUSERNAME -pPASSWORD kill 137

"Insert if not exists" statement in SQLite

If you never want to have duplicates, you should declare this as a table constraint:

CREATE TABLE bookmarks(
    users_id INTEGER,
    lessoninfo_id INTEGER,
    UNIQUE(users_id, lessoninfo_id)
);

(A primary key over both columns would have the same effect.)

It is then possible to tell the database that you want to silently ignore records that would violate such a constraint:

INSERT OR IGNORE INTO bookmarks(users_id, lessoninfo_id) VALUES(123, 456)

I lose my data when the container exits

You need to commit the changes you make to the container and then run it. Try this:

sudo docker pull ubuntu

sudo docker run ubuntu apt-get install -y ping

Then get the container id using this command:

sudo docker ps -l

Commit changes to the container:

sudo docker commit <container_id> iman/ping

Then run the container:

sudo docker run iman/ping ping www.google.com

This should work.

phpmyadmin #1045 Cannot log in to the MySQL server. after installing mysql command line client

I just solved this error for myself, but it was a bit silly on my part. Still worth checking if the above doesn't help you.

In my case, I was editing the config files in /etc/phpmyadmin, my install was located in /usr/share/phpmyadmin, and my install was not actually opening the /etc/phpmyadmin config files, as I thought it would. So I just did this command:

ln -s /etc/phpmyadmin/conf* /usr/share/phpmyadmin

For those not in the know, ln -s makes a soft link (basically a shortcut). So that command just makes shortcuts from the config files in /etc to the /usr/share install.

By the way, I figured this out after using the program opensnoop, which shows you what files are being opened (technically, traces open() syscalls and the pid of the process, as they happen), which you can install on Ubuntu with apt-get install perf-tools-unstable, or you can get it here.

Normalize numpy array columns in python

You can use sklearn.preprocessing:

from sklearn.preprocessing import normalize
data = np.array([
    [1000, 10, 0.5],
    [765, 5, 0.35],
    [800, 7, 0.09], ])
data = normalize(data, axis=0, norm='max')
print(data)
>>[[ 1.     1.     1.   ]
[ 0.765  0.5    0.7  ]
[ 0.8    0.7    0.18 ]]

Simple logical operators in Bash

What you've written actually almost works (it would work if all the variables were numbers), but it's not an idiomatic way at all.

(…) parentheses indicate a subshell. What's inside them isn't an expression like in many other languages. It's a list of commands (just like outside parentheses). These commands are executed in a separate subprocess, so any redirection, assignment, etc. performed inside the parentheses has no effect outside the parentheses.
- With a leading dollar sign, $(…) is a command substitution: there is a command inside the parentheses, and the output from the command is used as part of the command line (after extra expansions unless the substitution is between double quotes, but that's another story).
{ … } braces are like parentheses in that they group commands, but they only influence parsing, not grouping. The program x=2; { x=4; }; echo $x prints 4, whereas x=2; (x=4); echo $x prints 2. (Also braces require spaces around them and a semicolon before closing, whereas parentheses don't. That's just a syntax quirk.)
- With a leading dollar sign, ${VAR} is a parameter expansion, expanding to the value of a variable, with possible extra transformations.
((…)) double parentheses surround an arithmetic instruction, that is, a computation on integers, with a syntax resembling other programming languages. This syntax is mostly used for assignments and in conditionals.
- The same syntax is used in arithmetic expressions $((…)), which expand to the integer value of the expression.
[[ … ]] double brackets surround conditional expressions. Conditional expressions are mostly built on operators such as -n $variable to test if a variable is empty and -e $file to test if a file exists. There are also string equality operators: "$string1" == "$string2" (beware that the right-hand side is a pattern, e.g. [[ $foo == a* ]] tests if $foo starts with a while [[ $foo == "a*" ]] tests if $foo is exactly a*), and the familiar !, && and || operators for negation, conjunction and disjunction as well as parentheses for grouping. Note that you need a space around each operator (e.g. [[ "$x" == "$y" ]], not ~~[[ "$x"=="$y" ]]~~), and a space or a character like ; both inside and outside the brackets (e.g. [[ -n $foo ]], not ~~[[-n $foo]]~~).
[ … ] single brackets are an alternate form of conditional expressions with more quirks (but older and more portable). Don't write any for now; start worrying about them when you find scripts that contain them.

This is the idiomatic way to write your test in bash:

if [[ $varA == 1 && ($varB == "t1" || $varC == "t2") ]]; then

If you need portability to other shells, this would be the way (note the additional quoting and the separate sets of brackets around each individual test, and the use of the traditional = operator rather than the ksh/bash/zsh == variant):

if [ "$varA" = 1 ] && { [ "$varB" = "t1" ] || [ "$varC" = "t2" ]; }; then

Java Enum return Int

Simply call the ordinal() method on an enum value, to retrieve its corresponding number. There's no need to declare an addition attribute with its value, each enumerated value gets its own number by default, assigned starting from zero, incrementing by one for each value in the same order they were declared.

You shouldn't depend on the int value of an enum, only on its actual value. Enums in Java are a different kind of monster and are not like enums in C, where you depend on their integer code.

Regarding the example you provided in the question, Font.PLAIN works because that's just an integer constant of the Font class. If you absolutely need a (possibly changing) numeric code, then an enum is not the right tool for the job, better stick to numeric constants.

Streaming Audio from A URL in Android using MediaPlayer?

simple Media Player with streaming example.For xml part you need one button with id button1 and two images in your drawable folder with name button_pause and button_play and please don't forget to add the internet permission in your manifest.

public class MainActivity extends Activity {
private Button btn;
/**
 * help to toggle between play and pause.
 */
private boolean playPause;
private MediaPlayer mediaPlayer;
/**
 * remain false till media is not completed, inside OnCompletionListener make it true.
 */
private boolean intialStage = true;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn = (Button) findViewById(R.id.button1);
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    btn.setOnClickListener(pausePlay);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

private OnClickListener pausePlay = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        // TODO Auto-generated method stub

        if (!playPause) {
            btn.setBackgroundResource(R.drawable.button_pause);
            if (intialStage)
                new Player()
                        .execute("http://www.virginmegastore.me/Library/Music/CD_001214/Tracks/Track1.mp3");
            else {
                if (!mediaPlayer.isPlaying())
                    mediaPlayer.start();
            }
            playPause = true;
        } else {
            btn.setBackgroundResource(R.drawable.button_play);
            if (mediaPlayer.isPlaying())
                mediaPlayer.pause();
            playPause = false;
        }
    }
};
/**
 * preparing mediaplayer will take sometime to buffer the content so prepare it inside the background thread and starting it on UI thread.
 * @author piyush
 *
 */

class Player extends AsyncTask<String, Void, Boolean> {
    private ProgressDialog progress;

    @Override
    protected Boolean doInBackground(String... params) {
        // TODO Auto-generated method stub
        Boolean prepared;
        try {

            mediaPlayer.setDataSource(params[0]);

            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                @Override
                public void onCompletion(MediaPlayer mp) {
                    // TODO Auto-generated method stub
                    intialStage = true;
                    playPause=false;
                    btn.setBackgroundResource(R.drawable.button_play);
                    mediaPlayer.stop();
                    mediaPlayer.reset();
                }
            });
            mediaPlayer.prepare();
            prepared = true;
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            Log.d("IllegarArgument", e.getMessage());
            prepared = false;
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            prepared = false;
            e.printStackTrace();
        } catch (IllegalStateException e) {
            // TODO Auto-generated catch block
            prepared = false;
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            prepared = false;
            e.printStackTrace();
        }
        return prepared;
    }

    @Override
    protected void onPostExecute(Boolean result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        if (progress.isShowing()) {
            progress.cancel();
        }
        Log.d("Prepared", "//" + result);
        mediaPlayer.start();

        intialStage = false;
    }

    public Player() {
        progress = new ProgressDialog(MainActivity.this);
    }

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();
        this.progress.setMessage("Buffering...");
        this.progress.show();

    }
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    if (mediaPlayer != null) {
        mediaPlayer.reset();
        mediaPlayer.release();
        mediaPlayer = null;
    }
}

How to expire a cookie in 30 minutes using jQuery?

If you're using jQuery Cookie (https://plugins.jquery.com/cookie/), you can use decimal point or fractions.

As one day is 1, one minute would be 1 / 1440 (there's 1440 minutes in a day).

So 30 minutes is 30 / 1440 = 0.02083333.

Final code:

$.cookie("example", "foo", { expires: 30 / 1440, path: '/' });

I've added path: '/' so that you don't forget that the cookie is set on the current path. If you're on /my-directory/ the cookie is only set for this very directory.

How to randomly pick an element from an array

Use the Random class:

int getRandomNumber(int[] arr)
{
  return arr[(new Random()).nextInt(arr.length)];
}

Java: Enum parameter in method

This should do it:

private enum Alignment { LEFT, RIGHT };    
String drawCellValue (int maxCellLength, String cellValue, Alignment align){
  if (align == Alignment.LEFT)
  {
    //Process it...
  }
}

How can I run Android emulator for Intel x86 Atom without hardware acceleration on Windows 8 for API 21 and 19?

refer intel.com's requirements : Important: Intel HAXM cannot be used on systems without an Intel processor, or with an Intel processor that lacks the hardware features described in the "Hardware Requirements" section above.To determine the capabilities of your Intel processor

[Installation Instructions for Intel® Hardware Accelerated Execution Manager ] https://software.intel.com/en-us/android/articles/installation-instructions-for-intel-hardware-accelerated-execution-manager-mac-os-x

My PC does not support vt-x, I can not use android studio 1.0.2.

Java Wait for thread to finish

SwingWorker has doInBackground() which you can use to perform a task. You have the option to invoke get() and wait for the download to complete or you can override the done() method which will be invoked on the event dispatch thread once the SwingWorker completes.

The Swingworker has advantages to your current approach in that it has many of the features you are looking for so there is no need to reinvent the wheel. You are able to use the getProgress() and setProgress() methods as an alternative to an observer on the runnable for download progress. The done() method as I stated above is called after the worker finishes executing and is performed on the EDT, this allows you load the data after the download has completed.

What is (functional) reactive programming?

In pure functional programming, there are no side-effects. For many types of software (for example, anything with user interaction) side-effects are necessary at some level.

One way to get side-effect like behavior while still retaining a functional style is to use functional reactive programming. This is the combination of functional programming, and reactive programming. (The Wikipedia article you linked to is about the latter.)

The basic idea behind reactive programming is that there are certain datatypes that represent a value "over time". Computations that involve these changing-over-time values will themselves have values that change over time.

For example, you could represent the mouse coordinates as a pair of integer-over-time values. Let's say we had something like (this is pseudo-code):

x = <mouse-x>;
y = <mouse-y>;

At any moment in time, x and y would have the coordinates of the mouse. Unlike non-reactive programming, we only need to make this assignment once, and the x and y variables will stay "up to date" automatically. This is why reactive programming and functional programming work so well together: reactive programming removes the need to mutate variables while still letting you do a lot of what you could accomplish with variable mutations.

If we then do some computations based on this the resulting values will also be values that change over time. For example:

minX = x - 16;
minY = y - 16;
maxX = x + 16;
maxY = y + 16;

In this example, minX will always be 16 less than the x coordinate of the mouse pointer. With reactive-aware libraries you could then say something like:

rectangle(minX, minY, maxX, maxY)

And a 32x32 box will be drawn around the mouse pointer and will track it wherever it moves.

Here is a pretty good paper on functional reactive programming.

What's the best UI for entering date of birth?

As perhaps one of the older people here, and born late in the month, I find drop-down menus for birthdates to be frustrating. I typically have to scroll down on two drop-down menus, and that's awkward. I'd much rather type it in.

If you can have a control designed so that it can either accept drop-down menus or be typed into, and make it clear both work, that would be excellent.

Function to convert column number to letter?

Furthering on brettdj answer, here is to make the input of column number optional. If the column number input is omitted, the function returns the column letter of the cell that calls to the function. I know this can also be achieved using merely ColumnLetter(COLUMN()), but i thought it'd be nice if it can cleverly understand so.

Public Function ColumnLetter(Optional ColumnNumber As Long = 0) As String
    If ColumnNumber = 0 Then
        ColumnLetter = Split(Application.Caller.Address(True, False, xlA1), "$")(0)
    Else
        ColumnLetter = Split(Cells(1, ColumnNumber).Address(True, False, xlA1), "$")(0)
    End If
End Function

The trade off of this function is that it would be very very slightly slower than brettdj's answer because of the IF test. But this could be felt if the function is repeatedly used for very large amount of times.

Generating an MD5 checksum of a file

In Python 3.8+ you can do

import hashlib
with open("your_filename.txt", "rb") as f:
    file_hash = hashlib.md5()
    while chunk := f.read(8192):
        file_hash.update(chunk)

print(file_hash.digest())
print(file_hash.hexdigest())  # to get a printable str instead of bytes

Consider using hashlib.blake2b instead of md5 (just replace md5 with blake2b in the above snippet). It's cryptographically secure and faster than MD5.

Fastest way to convert JavaScript NodeList to Array?

The results will completely depend on the browser, to give an objective verdict, we have to make some performance tests, here are some results, you can run them here:

Chrome 6:

Firefox 3.6:

Firefox 4.0b2:

Safari 5:

IE9 Platform Preview 3:

Unsupported major.minor version 52.0 when rendering in Android Studio

For those of you, who are still facing this. I got this problem after I upgraded to Android Studio to 2.1.2. I was stuck at this problem for about an hour, I tried these solutions:

multidexEnabled true
increasing the memory for deamon thread
upgraded to Java 8

I double checked the gradle scripts and found this:

 compileSdkVersion 23
 buildToolsVersion "24.0.0"

changed to:

compileSdkVersion 23
buildToolsVersion "23.0.3"

I don't know how this caused the error, but this did the trick for me. Please let me know how this worked if you know the answer. Thanks

How do I deal with corrupted Git object files?

In general, fixing corrupt objects can be pretty difficult. However, in this case, we're confident that the problem is an aborted transfer, meaning that the object is in a remote repository, so we should be able to safely remove our copy and let git get it from the remote, correctly this time.

The temporary object file, with zero size, can obviously just be removed. It's not going to do us any good. The corrupt object which refers to it, d4a0e75..., is our real problem. It can be found in .git/objects/d4/a0e75.... As I said above, it's going to be safe to remove, but just in case, back it up first.

At this point, a fresh git pull should succeed.

...assuming it was going to succeed in the first place. In this case, it appears that some local modifications prevented the attempted merge, so a stash, pull, stash pop was in order. This could happen with any merge, though, and didn't have anything to do with the corrupted object. (Unless there was some index cleanup necessary, and the stash did that in the process... but I don't believe so.)

open() in Python does not create a file if it doesn't exist

So You want to write data to a file, but only if it doesn’t already exist?.

This problem is easily solved by using the little-known x mode to open() instead of the usual w mode. For example:

 >>> with open('somefile', 'wt') as f:
 ...     f.write('Hello\n')
...
>>> with open('somefile', 'xt') as f:
...     f.write('Hello\n')
...
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
FileExistsError: [Errno 17] File exists: 'somefile'
  >>>

If the file is binary mode, use mode xb instead of xt.

CSS3 Box Shadow on Top, Left, and Right Only

#div:before {
 content:"";
 position:absolute;
 width:100%;
 background:#fff;
 height:38px;
 top:1px;
 right:-5px;
}

How to get arguments with flags in Bash

#!/bin/bash

if getopts "n:" arg; then
  echo "Welcome $OPTARG"
fi

Save it as sample.sh and try running

sh sample.sh -n John

in your terminal.

Simple line plots using seaborn

Yes, you can do the same in Seaborn directly. This is done with tsplot() which allows either a single array as input, or two arrays where the other is 'time' i.e. x-axis.

import seaborn as sns

data =  [1,5,3,2,6] * 20
time = range(100)

sns.tsplot(data, time)

Authentication plugin 'caching_sha2_password' is not supported

I uninstalled mysql-connector (I installed following tutorial on w3schools tutorial) and installed mysql-connector-python instead. It worked.

Bootstrap 3 scrollable div for table

A scrolling comes from a box with class pre-scrollable

<div class="pre-scrollable"></div>

There's more examples: http://getbootstrap.com/css/#code-block
Wish it helps.

error NG6002: Appears in the NgModule.imports of AppModule, but could not be resolved to an NgModule class

npm cache clean --force -> cleaning the cache maybe solve the issue.

Merge development branch with master

Personally, my approach is similar to yours, with a few more branches and some squashing of commits when they go back to master.

One of my co-workers doesn't like having to switch branches so much and stays on the development branch with something similar to the following all executed from the development branch.

git fetch origin master

git merge master

git push origin development:master

The first line makes sure he has any upstream commits that have been made to master since the last time updated his local repository.

The second pulls those changes (if any) from master into development

The third pushes the development branch (now fully merged with master) up to origin/master.

I may have his basic workflow a little wrong, but that is the main gist of it.

PHP post_max_size overrides upload_max_filesize

Your server configuration settings allows users to upload files upto 16MB (because you have set upload_max_filesize = 16Mb) but the post_max_size accepts post data upto 8MB only. This is why it throws an error.

Quoted from the official PHP site:

To upload large files, post_max_size value must be larger than upload_max_filesize.

memory_limit should be larger than post_max_size

You should always set your post_max_size value greater than the upload_max_filesize value.

How to create dispatch queue in Swift 3

Compiled in XCode 8, Swift 3 https://github.com/rpthomas/Jedisware

 @IBAction func tap(_ sender: AnyObject) {

    let thisEmail = "emailaddress.com"
    let thisPassword = "myPassword" 

    DispatchQueue.global(qos: .background).async {

        // Validate user input

        let result = self.validate(thisEmail, password: thisPassword)

        // Go back to the main thread to update the UI
        DispatchQueue.main.async {
            if !result
            {
                self.displayFailureAlert()
            }

        }
    }

}

DISTINCT clause with WHERE

Wouldn't this work:

 SELECT email FROM table1 t1 
          where UNIQUE(SELECT * FROM table1 t2);

INSERT INTO TABLE from comma separated varchar-list

Something like this should work:

INSERT INTO #IMEIS (imei) VALUES ('val1'), ('val2'), ...

UPDATE:

Apparently this syntax is only available starting on SQL Server 2008.

Convert PEM to PPK file format

I'm rather shocked that this has not been answered since the solution is very simple.

As mentioned in previous posts, you would not want to convert it using C#, but just once. This is easy to do with PuTTYGen.

Download your .pem from AWS
Open PuTTYgen
Click "Load" on the right side about 3/4 down
Set the file type to *.*
Browse to, and Open your .pem file
PuTTY will auto-detect everything it needs, and you just need to click "Save private key" and you can save your ppk key for use with PuTTY

Enjoy!

How do I rename a column in a SQLite database table?

Create a new column with the desired column name: COLNew.

ALTER TABLE {tableName} ADD COLUMN COLNew {type};

Copy contents of old column COLOld to new column COLNew.

INSERT INTO {tableName} (COLNew) SELECT {COLOld} FROM {tableName}

Note: brackets are necessary in above line.

Adding new column to existing DataFrame in Python pandas

Let me just add that, just like for hum3, .loc didn't solve the SettingWithCopyWarning and I had to resort to df.insert(). In my case false positive was generated by "fake" chain indexing dict['a']['e'], where 'e' is the new column, and dict['a'] is a DataFrame coming from dictionary.

Also note that if you know what you are doing, you can switch of the warning using pd.options.mode.chained_assignment = None and than use one of the other solutions given here.

Calling a php function by onclick event

First quote your javascript:

onclick="hello();"

Also you can't call a php function from javascript; you need:

<script type="text/javascript">
function hello()
{
alert ("hello");
}
</script>

PHP Constants Containing Arrays?

You can define like this

define('GENERIC_DOMAIN',json_encode(array(
    'gmail.com','gmail.co.in','yahoo.com'
)));

$domains = json_decode(GENERIC_DOMAIN);
var_dump($domains);

How to create jar file with package structure?

You want

$ jar cvf asd.jar .

to specify the directory (e.g. .) to jar from. That will maintain your folder structure within the jar file.

Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

I have faced the same issue. Here is how I have fixed it.

Step 1: Remove mysql using command:

brew uninstall --force mysql

Step 2: Run command brew doctor which will give you some hint related to your brew packages.

Step 3: Cleanup brew packages using command:

brew cleanup

Step 4: Move/delete previously installed mysql data using command:

mv /usr/local/var/mysql/ /usr/local/var/old_mysql

Step 5: Finally install mysql again using command:

brew install mysql

g++ undefined reference to typeinfo

Quoting from the gcc manual:

For polymorphic classes (classes with virtual functions), the type_info object is written out along with the vtable [...] For all other types, we write out the type_info object when it is used: when applying `typeid' to an expression, throwing an object, or referring to a type in a catch clause or exception specification.

And a bit earlier on the same page:

If the class declares any non-inline, non-pure virtual functions, the first one is chosen as the “key method” for the class, and the vtable is only emitted in the translation unit where the key method is defined.

So, this error happens when the "key method" is missing its definition, as other answers already mentioned.

Convert string to float?

public class NumberFormatExceptionExample {
private static final String str = "123.234";
public static void main(String[] args){
float i = Float.valueOf(str); //Float.parseFloat(str);
System.out.println("Value parsed :"+i);
}
}

This should resolve the problem.

Can anyone suggest how should we handle this when the string comes in 35,000.00

document.all vs. document.getElementById

document.all() is a non-standard way of accessing DOM elements. It's been deprecated from a few browsers. It gives you access to all sub elements on your document.

document.getElementById() is a standard and fully supported. Each element have a unique id on the document.

If you have:

<div id="testing"></div>

Using

document.getElementById("testing");

Will have access to that specific div.

How to open warning/information/error dialog in Swing?

See How to Make Dialogs.

You can use:

JOptionPane.showMessageDialog(frame, "Eggs are not supposed to be green.");

And you can also change the symbol to an error message or an warning. E.g see JOptionPane Features.

Difference between margin and padding?

margin = space around (outside) the element from border outwards.

padding = space around (inside) the element from text to border.

see here: http://jsfiddle.net/robx/GaMpq/

Is it possible to use jQuery to read meta tags

For select twitter meta name , you can add a data attribute.

example :

meta name="twitter:card" data-twitterCard="" content=""
$('[data-twitterCard]').attr('content');

How to read file with async/await properly?

Since Node v11.0.0 fs promises are available natively without promisify:

const fs = require('fs').promises;
async function loadMonoCounter() {
    const data = await fs.readFile("monolitic.txt", "binary");
    return new Buffer(data);
}

Rails has_many with alias name

You could do this two different ways. One is by using "as"

has_many :tasks, :as => :jobs

def jobs
     self.tasks
end

Obviously the first one would be the best way to handle it.

How to get a thread and heap dump of a Java process on Windows that's not running in a console

Maybe jcmd?

Jcmd utility is used to send diagnostic command requests to the JVM, where these requests are useful for controlling Java Flight Recordings, troubleshoot, and diagnose JVM and Java Applications.

The jcmd tool was introduced with Oracle's Java 7 and is particularly useful in troubleshooting issues with JVM applications by using it to identify Java processes' IDs (akin to jps), acquiring heap dumps (akin to jmap), acquiring thread dumps (akin to jstack), viewing virtual machine characteristics such as system properties and command-line flags (akin to jinfo), and acquiring garbage collection statistics (akin to jstat). The jcmd tool has been called "a swiss-army knife for investigating and resolving issues with your JVM application" and a "hidden gem."

Here’s the process you’ll need to use in invoking the jcmd:

Go to jcmd <pid> GC.heap_dump <file-path>
In which
pid: is a Java Process Id, for which the heap dump will be captured Also, the
file-path: is a file path in which the heap dump is be printed.

Check it out for more information about taking Java heap dump.

PyCharm error: 'No Module' when trying to import own module (python script)

Content roots are folders holding your project code while source roots are defined as same too. The only difference i came to understand was that the code in source roots is built before the code in the content root.

Unchecking them wouldn't affect the runtime till the point you're not making separate modules in your package which are manually connected to Django. That means if any of your files do not hold the 'from django import...' or any of the function isn't called via django, unchecking these 2 options will result in a malfunction.

Update - the problem only arises when using Virtual Environmanet, and only when controlling the project via the provided terminal. Cause the terminal still works via the default system pyhtonpath and not the virtual env. while the python django control panel works fine.

How can I get the class name from a C++ object?

Just write simple template:

template<typename T>
const char* getClassName(T) {
  return typeid(T).name();
}

struct A {} a;

void main() {
   std::cout << getClassName(a);
}

AttributeError: 'numpy.ndarray' object has no attribute 'append'

Use numpy.concatenate(list1 , list2) or numpy.append() Look into the thread at Append a NumPy array to a NumPy array.

Can the Unix list command 'ls' output numerical chmod permissions?

@The MYYN

wow, nice awk! But what about suid, sgid and sticky bit?

You have to extend your filter with s and t, otherwise they will not count and you get the wrong result. To calculate the octal number for this special flags, the procedure is the same but the index is at 4 7 and 10. the possible flags for files with execute bit set are ---s--s--t amd for files with no execute bit set are ---S--S--T

ls -l | awk '{
    k = 0
    s = 0
    for( i = 0; i <= 8; i++ )
    {
        k += ( ( substr( $1, i+2, 1 ) ~ /[rwxst]/ ) * 2 ^( 8 - i ) )
    }
    j = 4 
    for( i = 4; i <= 10; i += 3 )
    {
        s += ( ( substr( $1, i, 1 ) ~ /[stST]/ ) * j )
        j/=2
    }
    if ( k )
    {
        printf( "%0o%0o ", s, k )
    }
    print
}'

For test:

touch blah
chmod 7444 blah

will result in:

7444 -r-Sr-Sr-T 1 cheko cheko   0 2009-12-05 01:03 blah

and

touch blah
chmod 7555 blah

will give:

7555 -r-sr-sr-t 1 cheko cheko   0 2009-12-05 01:03 blah

Visual Studio Code: format is not using indent settings

The VSCode plugin Vetur; used for VueJS applications was overriding the setting for me.

Setting vetur.format.options.tabSize to my preferred number of spaces made it work.

SQL: How to to SUM two values from different tables

select region,sum(number) total
from
(
    select region,number
    from cash_table
    union all
    select region,number
    from cheque_table
) t
group by region

Destroy or remove a view in Backbone.js

I think this should work

destroyView : function () {
    this.$el.remove();
}

Log exception with traceback

This is how I do it.

try:
    do_something()
except:
    # How can I log my exception here, complete with its traceback?
    import traceback
    traceback.format_exc() # this will print a complete trace to stout.

What is a stored procedure?

A stored procedure is a precompiled set of one or more SQL statements which perform some specific task.
A stored procedure should be executed stand alone using EXEC
A stored procedure can return multiple parameters
A stored procedure can be used to implement transact

Uncaught TypeError: (intermediate value)(...) is not a function

I have faced this issue when I created a new ES2015 class where the property name was equal to the method name.

e.g.:

class Test{
  constructor () {
    this.test = 'test'
  }

  test (test) {
    this.test = test
  }
}

let t = new Test()
t.test('new Test')

Please note this implementation was in NodeJS 6.10.

As a workaround (if you do not want to use the boring 'setTest' method name), you could use a prefix for your 'private' properties (like _test).

Open your Developer Tools in jsfiddle.

How to access a DOM element in React? What is the equilvalent of document.getElementById() in React

Since React uses JSX code to create an HTML we cannot refer dom using regulation methods like documment.querySelector or getElementById.

Instead we can use React ref system to access and manipulate Dom as shown in below example:

constructor(props){

    super(props);
    this.imageRef = React.createRef(); // create react ref
}

componentDidMount(){

    **console.log(this.imageRef)** // acessing the attributes of img tag when dom loads
}


render = (props) => {

const {urls,description} = this.props.image;
    return (

            <img
             **ref = {this.imageRef} // assign the ref of img tag here**
             src = {urls.regular} 
             alt = {description}
             />

        );

}

}

How can I check whether an array is null / empty?

You can also check whether there is any elements in the array by finding out its length, then put it into if-else statement to check whether it is null.

int[] k = new int[3];
if(k.length == 0)
{
//do something
}

What is the size of ActionBar in pixels?

To retrieve the height of the ActionBar in XML, just use

?android:attr/actionBarSize

or if you're an ActionBarSherlock or AppCompat user, use this

?attr/actionBarSize

If you need this value at runtime, use this

final TypedArray styledAttributes = getContext().getTheme().obtainStyledAttributes(
                    new int[] { android.R.attr.actionBarSize });
mActionBarSize = (int) styledAttributes.getDimension(0, 0);
styledAttributes.recycle();

If you need to understand where this is defined:

The attribute name itself is defined in the platform's /res/values/attrs.xml
The platform's themes.xml picks this attribute and assigns a value to it.
The value assigned in step 2 depends on different device sizes, which are defined in various dimens.xml files in the platform, ie. core/res/res/values-sw600dp/dimens.xml

Find and replace words/lines in a file

After visiting this question and noting the initial concerns of the chosen solution, I figured I'd contribute this one for those not using Java 7 which uses FileUtils instead of IOUtils from Apache Commons. The advantage here is that the readFileToString and the writeStringToFile handle the issue of closing the files for you automatically. (writeStringToFile doesn't document it but you can read the source). Hopefully this recipe simplifies things for anyone new coming to this problem.

  try {
     String content = FileUtils.readFileToString(new File("InputFile"), "UTF-8");
     content = content.replaceAll("toReplace", "replacementString");
     File tempFile = new File("OutputFile");
     FileUtils.writeStringToFile(tempFile, content, "UTF-8");
  } catch (IOException e) {
     //Simple exception handling, replace with what's necessary for your use case!
     throw new RuntimeException("Generating file failed", e);
  }

How do I get this javascript to run every second?

You can use setInterval:

var timer = setInterval( myFunction, 1000);

Just declare your function as myFunction or some other name, and then don't bind it to $('.more')'s live event.

"Parser Error Message: Could not load type" in Global.asax

Empty the bin folder. Build all the dependent class libraries and refer them in the main project, and build the complete solution.

Source

error: command 'gcc' failed with exit status 1 on CentOS

sudo yum install python36 python36-devel python36-libs python36-tools

if using python36, this is the best path for set up. Corrected this error for me on an aws ec2 instance

ORA-01653: unable to extend table by in tablespace ORA-06512

Just add a new datafile for the existing tablespace

ALTER TABLESPACE LEGAL_DATA ADD DATAFILE '/u01/oradata/userdata03.dbf' SIZE 200M;

To find out the location and size of your data files:

SELECT FILE_NAME, BYTES FROM DBA_DATA_FILES WHERE TABLESPACE_NAME = 'LEGAL_DATA';

What is the difference between Promises and Observables?

Promise vs Observable similarity first

Both used to handle async code.
Please look for promise example. Promise constructor passes a resolve reference function which will get called when it gets called with some value upon completion of some async task.

const promise = new Promise(resolve => {
  setTimeout(() => {
    resolve("Hello from a Promise!");
  }, 2000);
});

promise.then(value => console.log(value));

Observable example now. Here also we pass a function to observable, an observer to handle the async task. Unlike resolve in the promise it has the following method and subscribes in place of then.
So both handles async tasks. Now let's see the difference.

const observable = new Observable(observer => {
  setTimeout(() => {
    observer.next('Hello from a Observable!');
  }, 2000);
});

observable.subscribe(value => console.log(value));

Promise vs Observable difference

Promise

It resolves or reject a single value and can handle a single value async task at a time.
A promise once resolved the async value it completes, can no longer be used.its just one-time use and here it falls short.
Not cancellable
No rxjs support for operators.

Observable

ability to emit multiple asynchronous values.
Used to handle the stream of events or values. Consider you have an array of numerous tasks or values, and you want every time value is inserted into this it should be handled automatically. Anytime you push a value into this array, all of its subscribers will receive the latest value automatically.
Observables are useful for observing input changes, repeated interval, broadcast values to all child components, web socket push notifications etc.
Can be cancelled using unsubscribe method anytime.
One more last good part that promise that has is support for rxjs operators. You have many pipe operators majorly map, filter, switchMap, combineLatest etc. to transform observable data before subscribing.

How to connect to Oracle 11g database remotely

I install the Oracle server and it allows to connect from the local machine with no problem. But from another Maclaptop on my home network, it can't connect using either Sql Developer or Sql Plus. After doing some research, I figured out there is this additional step you have to do:

Use the Oracle net manager. Select the Listener. Add the IP address (in my case it is 192.168.1.12) besides of the 127.0.0.1 or localhost.

This will end up add an entry to the [OracleHome]\product\11.2.0\dbhome_1\network\admin\listener.ora

restart the listener service. (note: for me I reboot machine once to make it work)
Use lsnrctl status to verify
Notice the additional HOST=192.168.1.12 shows up and this is what to make remote connection to work.

C:\Windows\System32>lsnrctl status
LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 05-SEP-2015 13:51:43
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER

Alias LISTENER
Version TNSLSNR for 64-bit Windows: Version 11.2.0.1.0 - Production
Start Date 05-SEP-2015 13:45:18
Uptime 0 days 0 hr. 6 min. 24 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File
D:\oracle11gr2\product\11.2.0\dbhome_1\network\admin\listener.ora
Listener Log File d:\oracle11gr2\diag\tnslsnr\eagleii\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.\pipe\EXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.12)(PORT=1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "xe" has 1 instance(s).
Instance "xe", status READY, has 1 handler(s) for this service... Service "xeXDB" has 1 instance(s).
Instance "xe", status READY, has 1 handler(s) for this service... The command completed successfully
use tnsping to test the connection
ping the IPv4 address, not the localhost or the 127.0.0.1

C:\Windows\System32>tnsping 192.168.1.12
TNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 05-SEP-2015 14:09:11
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
D:\oracle11gr2\product\11.2.0\dbhome_1\network\admin\sqlnet.ora

Used EZCONNECT adapter to resolve the alias
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.1.12)(PORT=1521)))
OK (0 msec)

PHP $_FILES['file']['tmp_name']: How to preserve filename and extension?

$_FILES["file"]["name"] - the name of the uploaded file

from http://www.w3schools.com/php/php_file_upload.asp

SqlException: DB2 SQL error: SQLCODE: -302, SQLSTATE: 22001, SQLERRMC: null

As a general point when using a search engine to search for SQL codes make sure you put the sqlcode e.g. -302 in quote marks - like "-302" otherwise the search engine will exclude all search results including the text 302, since the - sign is used to exclude results.

Launching a website via windows commandline

Using a CLI, the easiest way (cross-platform) I've found is to use the NPM package https://github.com/sindresorhus/open-cli

npm install --global open-cli

Installing it globally allows running something like open-cli https://unlyed.github.io/next-right-now/.

You can also install it locally (e.g: in a project) and run npx open-cli https://unlyed.github.io/next-right-now/

Or, using a NPM script (which is how I actually use it): "doc:online": "open-cli https://unlyed.github.io/next-right-now/",

Running yarn doc:online will open the webpage, and this works on any platform (windows, mac, linux).

How to encrypt a large file in openssl using public key

Maybe you should check out the accepted answer to this (How to encrypt data in php using Public/Private keys?) question.

Instead of manually working around the message size limitation (or perhaps a trait) of RSA, it shows how to use the S/mime feature of OpenSSL to do the same thing and not needing to juggle with the symmetric key manually.

Converting URL to String and back again

Swift 3 used with UIWebViewDelegate shouldStartLoadWith

  func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {

    let urlPath: String = (request.url?.absoluteString)!
    print(urlPath)
    if urlPath.characters.last == "#" {
        return false
    }else{
        return true
    }

}

How do I add an existing Solution to GitHub from Visual Studio 2013

From the Team Explorer menu click "add" under the Git repository section (you'll need to add the solution directory to the Local Git Repository)
Open the solution from Team Explorer (right click on the added solution - open)
Click on the commit button and look for the link "push"

Visual Studio should now ask your GitHub credentials and then proceed to upload your solution.

Since I have my Windows account connected to Visual Studio to work with Team Foundation I don't know if it works without an account, Visual Studio will keep track of who commits so if you are not logged in it will probably ask you to first.

Set angular scope variable in markup

ngInit can help to initialize variables.

<div ng-app='app'>
    <div ng-controller="MyController" ng-init="myVar='test'">
        {{myVar}}
    </div>
</div>

jsfiddle example

List files in local git repo?

Try this command:

git ls-files

This lists all of the files in the repository, including those that are only staged but not yet committed.

http://www.kernel.org/pub/software/scm/git/docs/git-ls-files.html

Creating a ZIP archive in memory using System.IO.Compression

using System;
using System.IO;
using System.IO.Compression;

namespace ConsoleApplication
{
    class Program`enter code here`
    {
        static void Main(string[] args)
        {
            using (FileStream zipToOpen = new FileStream(@"c:\users\exampleuser\release.zip", FileMode.Open))
            {
                using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update))
                {
                    ZipArchiveEntry readmeEntry = archive.CreateEntry("Readme.txt");
                    using (StreamWriter writer = new StreamWriter(readmeEntry.Open()))
                    {
                            writer.WriteLine("Information about this package.");
                            writer.WriteLine("========================");
                    }
                }
            }
        }
    }
}

difference between width auto and width 100 percent

The initial width of a block level element like div or p is auto.

Use width:auto to undo explicitly specified widths.

if you specify width:100%, the element’s total width will be 100% of its containing block plus any horizontal margin, padding and border.

So, next time you find yourself setting the width of a block level element to 100% to make it occupy all available width, consider if what you really want is setting it to auto.

Identifying country by IP address

Yes, you can download the IP address ranges by country from https://lite.ip2location.com/ip-address-ranges-by-country

You can see that each country has multiple ranges and changes frequently.

memory error in python

you could try to create the same script that popups that error, dividing the script into several script by importing from external script. Example, hello.py expect an error Memory error, so i divide hello.py into several scripts h.py e.py ll.py o.py all of them have to get into a folder "hellohello" into that folder create init.py into init write import h,e,ll,o and then on ide you write import hellohello

The relationship could not be changed because one or more of the foreign-key properties is non-nullable

The reason you're facing this is due to the difference between composition and aggregation.

In composition, the child object is created when the parent is created and is destroyed when its parent is destroyed. So its lifetime is controlled by its parent. e.g. A blog post and its comments. If a post is deleted, its comments should be deleted. It doesn't make sense to have comments for a post that doesn't exist. Same for orders and order items.

In aggregation, the child object can exist irrespective of its parent. If the parent is destroyed, the child object can still exist, as it may be added to a different parent later. e.g.: the relationship between a playlist and the songs in that playlist. If the playlist is deleted, the songs shouldn't be deleted. They may be added to a different playlist.

The way Entity Framework differentiates aggregation and composition relationships is as follows:

For composition: it expects the child object to a have a composite primary key (ParentID, ChildID). This is by design as the IDs of the children should be within the scope of their parents.
For aggregation: it expects the foreign key property in the child object to be nullable.

So, the reason you're having this issue is because of how you've set your primary key in your child table. It should be composite, but it's not. So, Entity Framework sees this association as aggregation, which means, when you remove or clear the child objects, it's not going to delete the child records. It'll simply remove the association and sets the corresponding foreign key column to NULL (so those child records can later be associated with a different parent). Since your column does not allow NULL, you get the exception you mentioned.

Solutions:

1- If you have a strong reason for not wanting to use a composite key, you need to delete the child objects explicitly. And this can be done simpler than the solutions suggested earlier:

context.Children.RemoveRange(parent.Children);

2- Otherwise, by setting the proper primary key on your child table, your code will look more meaningful:

parent.Children.Clear();

How do I use NSTimer?

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(timerCalled) userInfo:nil repeats:NO];

-(void)timerCalled
{
     NSLog(@"Timer Called");
     // Your Code
}

Android Fastboot devices not returning device

You must run fastboot as root. Try sudo fastboot

MySQL "between" clause not inclusive?

The problem is that 2011-01-31 really is 2011-01-31 00:00:00. That is the beginning of the day. Everything during the day is not included.

CMake does not find Visual C++ compiler

I had this issue under Windows 10 when using Visual Studio 2015 Professional, while Visual Studio 2015 Express worked! Under Windows 7, both Visual Studio versions used to work.

New projects created from the Visual Studio 2015 Professional IDE successfully compile, but CMake would fail to find the compiler reporting:

The C compiler identification is unknown
The CXX compiler identification is unknown

I upgraded CMake from 3.4.1 to 3.11.4, and now the problem is gone.

How do I get the value of text input field using JavaScript?

Just try this ..

_x000D_

function handleValueChange() {
    var y = document.getElementById('textbox_id').value;
    var x = document.getElementById('result');
    x.innerHTML = y;
}

function changeTextarea() {
  var a = document.getElementById('text-area').value;
  var b = document.getElementById('text-area-result');
  b.innerHTML = a;
}

_x000D_

input {
  padding: 5px;
}

p {
  white-space: pre;
}

_x000D_

<input type="text" id="textbox_id" placeholder="Enter string here..." oninput="handleValueChange()">
<p id="result"></p>

<textarea name="" id="text-area" cols="20" rows="5" oninput="changeTextarea()"></textarea>
<p id="text-area-result"></p>

_x000D_

How to override the path of PHP to use the MAMP path?

The latest version of MAMP (Version 5+) offers an easy way to make the MAMP PHP version available to the command line. Just select "PHP" in the the side bar menu and check "Make this version available on the command line". Easy peasy! See attached screenshot:)

screenshot

Getting visitors country from their IP

Use following services

1) http://api.hostip.info/get_html.php?ip=12.215.42.19

$json = file_get_contents('http://freegeoip.appspot.com/json/66.102.13.106');
$expression = json_decode($json);
print_r($expression);

3) http://ipinfodb.com/ip_location_api.php

How to ignore SSL certificate errors in Apache HttpClient 4.0

Tested with HttpClient 4.5.5 with Fluent API

final SSLContext sslContext = new SSLContextBuilder()
    .loadTrustMaterial(null, (x509CertChain, authType) -> true).build();

CloseableHttpClient httpClient = HttpClients.custom()
    .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)
    .setSSLContext(sslContext).build();

String result = Executor.newInstance(httpClient)
    .execute(Request.Get("https://localhost:8080/someapi")
    .connectTimeout(1000).socketTimeout(1000))
    .returnContent().asString();

Cast Double to Integer in Java

Simply use the intValue method of Double

Double initialValue = 7.12;
int finalValue = initialValue.intValue();

Strip last two characters of a column in MySQL

Why not using LEFT(string, length) function instead of substring.

LEFT(col,char_length(col)-2)

you can visit here https://dev.mysql.com/doc/refman/5.7/en/string-functions.html#function_left to know more about Mysql String Functions.

Allow Access-Control-Allow-Origin header using HTML5 fetch API

Look at https://expressjs.com/en/resources/middleware/cors.html You have to use cors.

Install:

$ npm install cors

const cors = require('cors');
app.use(cors());

You have to put this code in your node server.

Easiest way to loop through a filtered list with VBA?

Suppose I have numbers 1 to 10 in cells A2:A11 with my autofilter in A1. I now filter to only show numbers greater then 5 (i.e. 6, 7, 8, 9, 10).

This code will only print visible cells:

Sub SpecialLoop()
    Dim cl As Range, rng As Range

    Set rng = Range("A2:A11")

    For Each cl In rng
        If cl.EntireRow.Hidden = False Then //Use Hidden property to check if filtered or not
            Debug.Print cl
        End If
    Next

End Sub

Perhaps there is a better way with SpecialCells but the above worked for me in Excel 2003.

EDIT

Just found a better way with SpecialCells:

Sub SpecialLoop()
    Dim cl As Range, rng As Range

    Set rng = Range("A2:A11")

    For Each cl In rng.SpecialCells(xlCellTypeVisible)
        Debug.Print cl
    Next cl

End Sub

SASS - use variables across multiple files

You can do it like this:

I have a folder named utilities and inside that I have a file named _variables.scss

in that file i declare variables like so:

$black: #000;
$white: #fff;

then I have the style.scss file in which i import all of my other scss files like this:

// Utilities
@import "utilities/variables";

// Base Rules
@import "base/normalize";
@import "base/global";

then, within any of the files I have imported, I should be able to access the variables I have declared.

Just make sure you import the variable file before any of the others you would like to use it in.

an attempt was made to access a socket in a way forbbiden by its access permissions. why?

This is the error that is returned when the Windows Firewall blocks the port (out-going). We have a strict web server so the outgoing ports are blocked by default. All I had to do was to create a rule to allow the TCP port number in wf.msc.

Nginx: Permission denied for nginx on Ubuntu

if you don't want to start nginx as root.

first creat log file :

sudo touch /var/log/nginx/error.log

and then fix permissions:

sudo chown -R www-data:www-data /var/log/nginx

sudo find /var/log/nginx -type f -exec chmod 666 {} \;

sudo find /var/log/nginx -type d -exec chmod 755 {} \;

Converting a year from 4 digit to 2 digit and back again in C#

I've seen some systems decide that the cutoff is 75; 75+ is 19xx and below is 20xx.

SQL query to get the deadlocks in SQL SERVER 2008

In order to capture deadlock graphs without using a trace (you don't need profiler necessarily), you can enable trace flag 1222. This will write deadlock information to the error log. However, the error log is textual, so you won't get nice deadlock graph pictures - you'll have to read the text of the deadlocks to figure it out.

I would set this as a startup trace flag (in which case you'll need to restart the service). However, you can run it only for the current running instance of the service (which won't require a restart, but which won't resume upon the next restart) using the following global trace flag command:

DBCC TRACEON(1222, -1);

A quick search yielded this tutorial:

http://www.mssqltips.com/sqlservertip/2130/finding-sql-server-deadlocks-using-trace-flag-1222/

Also note that if your system experiences a lot of deadlocks, this can really hammer your error log, and can become quite a lot of noise, drowning out other, important errors.

Have you considered third party monitoring tools? SQL Sentry Performance Advisor, for example, has a much nicer deadlock graph, showing you object / index names as well as the order in which the locks were taken. As a bonus, these are captured for you automatically on monitored servers without having to configure trace flags, run your own traces, etc.:

Disclaimer: I work for SQL Sentry.

codeigniter, result() vs. result_array()

result_array() returns Associative Array type data. Returning pure array is slightly faster than returning an array of objects. result() is recursive in that it returns an std class object where as result_array() just returns a pure array, so result_array() would be choice regarding performance.

Auto-indent in Notepad++

This may seem silly, but in the original question, Turion was editing a plain text file. Make sure you choose the correct language from the Language menu

How to write hello world in assembler under Windows?

The best examples are those with fasm, because fasm doesn't use a linker, which hides the complexity of windows programming by another opaque layer of complexity. If you're content with a program that writes into a gui window, then there is an example for that in fasm's example directory.

If you want a console program, that allows redirection of standard in and standard out that is also possible. There is a (helas highly non-trivial) example program available that doesn't use a gui, and works strictly with the console, that is fasm itself. This can be thinned out to the essentials. (I've written a forth compiler which is another non-gui example, but it is also non-trivial).

Such a program has the following command to generate a proper header for 32-bit executable, normally done by a linker.

FORMAT PE CONSOLE

A section called '.idata' contains a table that helps windows during startup to couple names of functions to the runtimes addresses. It also contains a reference to KERNEL.DLL which is the Windows Operating System.

 section '.idata' import data readable writeable
    dd 0,0,0,rva kernel_name,rva kernel_table
    dd 0,0,0,0,0

  kernel_table:
    _ExitProcess@4    DD rva _ExitProcess
    CreateFile        DD rva _CreateFileA
        ...
        ...
    _GetStdHandle@4   DD rva _GetStdHandle
                      DD 0

The table format is imposed by windows and contains names that are looked up in system files, when the program is started. FASM hides some of the complexity behind the rva keyword. So _ExitProcess@4 is a fasm label and _exitProcess is a string that is looked up by Windows.

Your program is in section '.text'. If you declare that section readable writeable and executable, it is the only section you need to add.

    section '.text' code executable readable writable

You can call all the facilities you declared in the .idata section. For a console program you need _GetStdHandle to find he filedescriptors for standard in and standardout (using symbolic names like STD_INPUT_HANDLE which fasm finds in the include file win32a.inc). Once you have the file descriptors you can do WriteFile and ReadFile. All functions are described in the kernel32 documentation. You are probably aware of that or you wouldn't try assembler programming.

In summary: There is a table with asci names that couple to the windows OS. During startup this is transformed into a table of callable addresses, which you use in your program.

Explaining Apache ZooKeeper

I understand the ZooKeeper in general but had problems with the terms "quorum" and "split brain" so maybe I can share my findings with you (I consider myself also a layman).

Let's say we have a ZooKeeper cluster of 5 servers. One of the servers will become the leader and the others will become followers.

These 5 servers form a quorum. Quorum simply means "these servers can vote upon who should be the leader".
So the voting is based on majority. Majority simply means "more than half" so more than half of the number of servers must agree for a specific server to become the leader.
So there is this bad thing that may happen called "split brain". A split brain is simply this, as far as I understand: The cluster of 5 servers splits into two parts, or let's call it "server teams", with maybe one part of 2 and the other of 3 servers. This is really a bad situation as if both "server teams" must execute a specific order how would you decide wich team should be preferred? They might have received different information from the clients. So it is really important to know what "server team" is still relevant and which one can/should be ignored.
Majority is also the reason you should use an odd number of servers. If you have 4 servers and a split brain where 2 servers seperate then both "server teams" could say "hey, we want to decide who is the leader!" but how should you decide which 2 servers you should choose? With 5 servers it's simple: The server team with 3 servers has the majority and is allowed to select the new leader.
Even if you just have 3 servers and one of them fails the other 2 still form the majority and can agree that one of them will become the new leader.

I realize once you think about it some time and understand the terms it's not so complicated anymore. I hope this also helps anyone in understanding these terms.

Insert multiple values using INSERT INTO (SQL Server 2005)

In SQL Server 2008,2012,2014 you can insert multiple rows using a single SQL INSERT statement.

 INSERT INTO TableName ( Column1, Column2 ) VALUES
    ( Value1, Value2 ), ( Value1, Value2 )

Another way

INSERT INTO TableName (Column1, Column2 )
SELECT Value1 ,Value2
UNION ALL
SELECT Value1 ,Value2
UNION ALL
SELECT Value1 ,Value2
UNION ALL
SELECT Value1 ,Value2
UNION ALL
SELECT Value1 ,Value2

Disable double-tap "zoom" option in browser on touch devices

If you need a version that works without jQuery, I modified Wouter Konecny's answer (which was also created by modifying this gist by Johan Sundström) to use vanilla JavaScript.

function preventZoom(e) {
  var t2 = e.timeStamp;
  var t1 = e.currentTarget.dataset.lastTouch || t2;
  var dt = t2 - t1;
  var fingers = e.touches.length;
  e.currentTarget.dataset.lastTouch = t2;

  if (!dt || dt > 500 || fingers > 1) return; // not double-tap

  e.preventDefault();
  e.target.click();
}

Then add an event handler on touchstart that calls this function:

myButton.addEventListener('touchstart', preventZoom);

Fastest way to get the first object from a queryset in django?

You can use array slicing:

Entry.objects.all()[:1].get()

Which can be used with .filter():

Entry.objects.filter()[:1].get()

You wouldn't want to first turn it into a list because that would force a full database call of all the records. Just do the above and it will only pull the first. You could even use .order_by() to ensure you get the first you want.

Be sure to add the .get() or else you will get a QuerySet back and not an object.

HttpServletRequest - Get query string parameters, no form data

Java 8

return Collections.list(httpServletRequest.getParameterNames())
                  .stream()
                  .collect(Collectors.toMap(parameterName -> parameterName, httpServletRequest::getParameterValues));

Add a CSS class to <%= f.submit %>

You can add a class declaration to the submit button of a form by doing the following:

<%= f.submit class: 'btn btn-default' %> <-- Note: there is no comma!

If you are altering a _form.html.erb partial of a scaffold and you want to keep the dynamic change of the button name between controller actions, DO NOT specify a name 'name'.

Without specifying a name and depending on the action the form is rendered the button will get the .class = "btn btn-default" (Bootstrap class)(or whatever .class you specify) with the following names:

Update model_name
Create model_name
(where model_name the name of the scaffold's model)

How do you tell if a string contains another string in POSIX sh?

case $(pwd) in
  *path) echo "ends with path";;
  path*) echo "starts with path";;
  *path*) echo "contains path";;
  *) echo "this is the default";;
esac

Retrieving data from a POST method in ASP.NET

You can get a form value posted to a page using code similiar to this (C#) -

string formValue;
if (!string.IsNullOrEmpty(Request.Form["txtFormValue"]))
{
  formValue= Request.Form["txtFormValue"];
}

or this (VB)

Dim formValue As String
If Not String.IsNullOrEmpty(Request.Form("txtFormValue")) Then
    formValue = Request.Form("txtFormValue")
End If

Once you have the values you need you can then construct a SQL statement and and write the data to a database.

How do I encode/decode HTML entities in Ruby?

You can use htmlascii gem:

Htmlascii.convert string

How to use android emulator for testing bluetooth application?

You can't. The emulator does not support Bluetooth, as mentioned in the SDK's docs and several other places. Android emulator does not have bluetooth capabilities".

You can only use real devices.

Emulator Limitations

The functional limitations of the emulator include:

No support for placing or receiving actual phone calls. However, You can simulate phone calls (placed and received) through the emulator console
No support for USB
No support for device-attached headphones
No support for determining SD card insert/eject
No support for WiFi, Bluetooth, NFC

Refer to the documentation

How to index characters in a Golang string?

You can also try typecasting it with string.

package main

import "fmt"

func main() {
    fmt.Println(string("Hello"[1]))
}

iPhone - Get Position of UIView within entire UIWindow

For me this code worked best:

private func getCoordinate(_ view: UIView) -> CGPoint {
    var x = view.frame.origin.x
    var y = view.frame.origin.y
    var oldView = view

    while let superView = oldView.superview {
        x += superView.frame.origin.x
        y += superView.frame.origin.y
        if superView.next is UIViewController {
            break //superView is the rootView of a UIViewController
        }
        oldView = superView
    }

    return CGPoint(x: x, y: y)
}

Re-assign host access permission to MySQL user

For reference, the solution is:

UPDATE mysql.user SET host = '10.0.0.%' WHERE host = 'internalfoo' AND user != 'root';
UPDATE mysql.db SET host = '10.0.0.%' WHERE host = 'internalfoo' AND user != 'root';
FLUSH PRIVILEGES;

How can I get the request URL from a Java Filter?

request.getRequestURL();

Documentation

Why use #define instead of a variable

The #define allows you to establish a value in a header that would otherwise compile to size-greater-than-zero. Your headers should not compile to size-greater-than-zero.

// File:  MyFile.h

// This header will compile to size-zero.
#define TAX_RATE 0.625

// NO:  static const double TAX_RATE = 0.625;
// NO:  extern const double TAX_RATE;  // WHAT IS THE VALUE?

EDIT: As Neil points out in the comment to this post, the explicit definition-with-value in the header would work for C++, but not C.

Understanding the difference between Object.create() and new SomeFunction()

The difference is the so-called "pseudoclassical vs. prototypal inheritance". The suggestion is to use only one type in your code, not mixing the two.

In pseudoclassical inheritance (with "new" operator), imagine that you first define a pseudo-class, and then create objects from that class. For example, define a pseudo-class "Person", and then create "Alice" and "Bob" from "Person".

In prototypal inheritance (using Object.create), you directly create a specific person "Alice", and then create another person "Bob" using "Alice" as a prototype. There is no "class" here; all are objects.

Internally, JavaScript uses "prototypal inheritance"; the "pseudoclassical" way is just some sugar.

See this link for a comparison of the two ways.

When to use extern in C++

It's all about the linkage.

The previous answers provided good explainations about extern.

But I want to add an important point.

You ask about extern in C++ not in C and I don't know why there is no answer mentioning about the case when extern comes with const in C++.

In C++, a const variable has internal linkage by default (not like C).

So this scenario will lead to linking error:

Source 1 :

const int global = 255; //wrong way to make a definition of global const variable in C++

Source 2 :

extern const int global; //declaration

It need to be like this:

Source 1 :

extern const int global = 255; //a definition of global const variable in C++

Source 2 :

extern const int global; //declaration

Tomcat view catalina.out log file

I found logs of Apache Tomcat/9.0.33 version in below path:

In tail -f /opt/tomcat/logs/catalina.out

Thanks.

How to get last N records with activerecord?

Solution is here:

SomeModel.last(5).reverse

Since rails is lazy, it will eventually hit the database with SQL like: "SELECT table.* FROM table ORDER BY table.id DESC LIMIT 5".

Import a custom class in Java

In the same package you don't need to import the class.

Otherwise, it is very easy. In Eclipse or NetBeans just write the class you want to use and press on Ctrl + Space. The IDE will automatically import the class.

General information:

You can import a class with import keyword after package information:

Example:

package your_package;


import anotherpackage.anotherclass;

public class Your_Class {
    ...
    private Vector variable;
    ...
}

You can instance the class with:

Anotherclass foo = new Anotherclass();

PHP AES encrypt / decrypt

$sDecrypted and $sEncrypted were undefined in your code. See a solution that works (but is not secure!):

STOP!

This example is insecure! Do not use it!

$Pass = "Passwort";
$Clear = "Klartext";        

$crypted = fnEncrypt($Clear, $Pass);
echo "Encrypred: ".$crypted."</br>";

$newClear = fnDecrypt($crypted, $Pass);
echo "Decrypred: ".$newClear."</br>";        

function fnEncrypt($sValue, $sSecretKey)
{
    return rtrim(
        base64_encode(
            mcrypt_encrypt(
                MCRYPT_RIJNDAEL_256,
                $sSecretKey, $sValue, 
                MCRYPT_MODE_ECB, 
                mcrypt_create_iv(
                    mcrypt_get_iv_size(
                        MCRYPT_RIJNDAEL_256, 
                        MCRYPT_MODE_ECB
                    ), 
                    MCRYPT_RAND)
                )
            ), "\0"
        );
}

function fnDecrypt($sValue, $sSecretKey)
{
    return rtrim(
        mcrypt_decrypt(
            MCRYPT_RIJNDAEL_256, 
            $sSecretKey, 
            base64_decode($sValue), 
            MCRYPT_MODE_ECB,
            mcrypt_create_iv(
                mcrypt_get_iv_size(
                    MCRYPT_RIJNDAEL_256,
                    MCRYPT_MODE_ECB
                ), 
                MCRYPT_RAND
            )
        ), "\0"
    );
}

But there are other problems in this code which make it insecure, in particular the use of ECB (which is not an encryption mode, only a building block on top of which encryption modes can be defined). See Fab Sa's answer for a quick fix of the worst problems and Scott's answer for how to do this right.

How to print / echo environment variables?

To bring the existing answers together with an important clarification:

As stated, the problem with NAME=sam echo "$NAME" is that $NAME gets expanded by the current shell before assignment NAME=sam takes effect.

Solutions that preserve the original semantics (of the (ineffective) solution attempt NAME=sam echo "$NAME"):

Use either eval^[1] (as in the question itself), or printenv (as added by Aaron McDaid to heemayl's answer), or bash -c (from Ljm Dullaart's answer), in descending order of efficiency:

NAME=sam eval 'echo "$NAME"'  # use `eval` only if you fully control the command string
NAME=sam printenv NAME
NAME=sam bash -c 'echo "$NAME"'

^{printenv is not a POSIX utility, but it is available on both Linux and macOS/BSD.}

What this style of invocation (<var>=<name> cmd ...) does is to define NAME:

as an environment variable
that is only defined for the command being invoked.

In other words: NAME only exists for the command being invoked, and has no effect on the current shell (if no variable named NAME existed before, there will be none after; a preexisting NAME variable remains unchanged).

POSIX defines the rules for this kind of invocation in its Command Search and Execution chapter.

The following solutions work very differently (from heemayl's answer):

NAME=sam; echo "$NAME"
NAME=sam && echo "$NAME"

While they produce the same output, they instead define:

a shell variable NAME (only) rather than an environment variable
- if echo were a command that relied on environment variable NAME, it wouldn't be defined (or potentially defined differently from earlier).
that lives on after the command.

Note that every environment variable is also exposed as a shell variable, but the inverse is not true: shell variables are only visible to the current shell and its subshells, but not to child processes, such as external utilities and (non-sourced) scripts (unless they're marked as environment variables with export or declare -x).

^{[1] Technically, bash is in violation of POSIX here (as is zsh): Since eval is a special shell built-in, the preceding NAME=sam assignment should cause the the variable $NAME to remain in scope after the command finishes, but that's not what happens.

However, when you run bash in POSIX compatibility mode, it is compliant.

dash and ksh are always compliant.

The exact rules are complicated, and some aspects are left up to the implementations to decide; again, see Command Search and Execution.

Also, the usual disclaimer applies: Use eval only on input you fully control or implicitly trust.}

SQLite Reset Primary Key Field

You can reset by update sequence after deleted rows in your-table

UPDATE SQLITE_SEQUENCE SET SEQ=0 WHERE NAME='table_name';

ReactJS: Maximum update depth exceeded error

In this case , this code

{<td><span onClick={this.toggle()}>Details</span></td>}

causes toggle function to call immediately and re render it again and again thus making infinite calls.

so passing only the reference to that toggle method will solve the problem.

so ,

{<td><span onClick={this.toggle}>Details</span></td>}

will be the solution code.

If you want to use the () , you should use an arrow function like this

{<td><span onClick={()=> this.toggle()}>Details</span></td>}

In case you want to pass parameters you should choose the last option and you can pass parameters like this

{<td><span onClick={(arg)=>this.toggle(arg)}>Details</span></td>}

In the last case it doesn't call immediately and don't cause the re render of the function, hence avoiding infinite calls.

How to change the font color of a disabled TextBox?

Setting the 'Read Only' as 'True' is the easiest method.

How to ping ubuntu guest on VirtualBox

Using NAT (the default) this is not possible. Bridged Networking should allow it. If bridged does not work for you (this may be the case when your network adminstration does not allow multiple IP addresses on one physical interface), you could try 'Host-only networking' instead.

For configuration of Host-only here is a quote from the vbox manual(which is pretty good). http://www.virtualbox.org/manual/ch06.html:

For host-only networking, like with internal networking, you may find the DHCP server useful that is built into VirtualBox. This can be enabled to then manage the IP addresses in the host-only network since otherwise you would need to configure all IP addresses statically.

In the VirtualBox graphical user interface, you can configure all these items in the global settings via "File" -> "Settings" -> "Network", which lists all host-only networks which are presently in use. Click on the network name and then on the "Edit" button to the right, and you can modify the adapter and DHCP settings.

A simple scenario using wait() and notify() in java

Example for wait() and notifyall() in Threading.

A synchronized static array list is used as resource and wait() method is called if the array list is empty. notify() method is invoked once a element is added for the array list.

public class PrinterResource extends Thread{

//resource
public static List<String> arrayList = new ArrayList<String>();

public void addElement(String a){
    //System.out.println("Add element method "+this.getName());
    synchronized (arrayList) {
        arrayList.add(a);
        arrayList.notifyAll();
    }
}

public void removeElement(){
    //System.out.println("Remove element method  "+this.getName());
    synchronized (arrayList) {
        if(arrayList.size() == 0){
            try {
                arrayList.wait();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }else{
            arrayList.remove(0);
        }
    }
}

public void run(){
    System.out.println("Thread name -- "+this.getName());
    if(!this.getName().equalsIgnoreCase("p4")){
        this.removeElement();
    }
    this.addElement("threads");

}

public static void main(String[] args) {
    PrinterResource p1 = new PrinterResource();
    p1.setName("p1");
    p1.start();

    PrinterResource p2 = new PrinterResource();
    p2.setName("p2");
    p2.start();


    PrinterResource p3 = new PrinterResource();
    p3.setName("p3");
    p3.start();


    PrinterResource p4 = new PrinterResource();
    p4.setName("p4");
    p4.start();     

    try{
        p1.join();
        p2.join();
        p3.join();
        p4.join();
    }catch(InterruptedException e){
        e.printStackTrace();
    }
    System.out.println("Final size of arraylist  "+arrayList.size());
   }
}

Uninstall Django completely

pip search command does not show installed packages, but search packages in pypi.

Use pip freeze command and grep to see installed packages:

pip freeze | grep Django

How to activate virtualenv?

I would recommend virtualenvwrapper as well. It works wonders for me and how I always have problems with activating. http://virtualenvwrapper.readthedocs.org/en/latest/

javascript filter array of objects

The most straightforward and readable approach will be the usage of native javascript filter method.

Native javaScript filter takes a declarative approach in filtering array elements. Since it is a method defined on Array.prototype, it iterates on a provided array and invokes a callback on it. This callback, which acts as our filtering function, takes three parameters:

element — the current item in the array being iterated over

index — the index or location of the current element in the array that is being iterated over

array — the original array that the filter method was applied on Let’s use this filter method in an example. Note that the filter can be applied on any sort of array. In this example, we are going to filter an array of objects based on an object property.

An example of filtering an array of objects based on object properties could look something like this:

// Please do not hate me for bashing on pizza and burgers.
// and FYI, I totally made up the healthMetric param :)
let foods = [
  { type: "pizza", healthMetric: 25 },
  { type: "burger", healthMetric: 10 },
  { type: "salad", healthMetric: 60 },
  { type: "apple", healthMetric: 82 }
];
let isHealthy = food => food.healthMetric >= 50;

const result = foods.filter(isHealthy);

console.log(result.map(food => food.type));
// Result: ['salad', 'apple']

To learn more about filtering arrays in functions and yo build your own filtering, check out this article: https://medium.com/better-programming/build-your-own-filter-e88ba0dcbfae

Quick and easy file dialog in Python?

How to write a full path in a batch file having a folder name with space?

start "" AcroRd32.exe /A "page=207" "C:\Users\abc\Desktop\abc xyz def\abc def xyz 2015.pdf"

You may try this, I did it finally, it works!

How to read text files with ANSI encoding and non-English letters?

using (StreamWriter writer = new StreamWriter(File.Open(@"E:\Sample.txt", FileMode.Append), Encoding.GetEncoding(1250)))  ////File.Create(path)
        {
            writer.Write("Sample Text");
        }

dll missing in JDBC

If its the case of the dll file missing you can download the dll file from this link http://en.osdn.jp/projects/sfnet_dose-grok/downloads/sqljdbc_auth.dll/

else you need to provide the username and password of the db you are trying to connect, and make the authentication as false

jQuery: read text file from file system

As long as the file does not need to be dynamically generated, e.g., a simple text or html file, you can test it locally WITHOUT a web server - just use a relative path.

xcode-select active developer directory error

I was having an issue while trying to install packages using npm. I got the error: "sudo xcode-select -s /Applications//Xcode.app/Contents/Developer/"

To fix this

I opened Xcode.
Preferences
Locations
Selected the Command Lin Tools: Xcode 6.1.1

Now when installing packages with npm I no longer get errors.

Whitespaces in java

Why don't you check if text.trim() has a different length? :

if(text.length() == text.trim().length() || otherConditions){
    //your code
}

set height of imageview as matchparent programmatically

I had same issue. Resolved by firstly setting :

imageView.setMinHeight(0);
imageView.setMinimumHeight(0);

And then :

imageView.getLayoutParams().height= ViewGroup.LayoutParams.MATCH_PARENT;

setMinHeight is defined by ImageView, while setMinimumHeight is defined by View. According to the docs, the greater of the two values is used, so both must be set.

Find out free space on tablespace

Unless I'm mistaken, the above code does not take unallocated space into account, so if you really want to know when you'll hit a hard limit, you should use maxbytes.

I think the code below does that. It calculates free space as "freespace" + unallocated space.

select 
     free.tablespace_name,
     free.bytes,
     reserv.maxbytes,
     reserv.bytes,
     reserv.maxbytes - reserv.bytes + free.bytes "max free bytes",
     reserv.datafiles
from
    (select tablespace_name, count(1) datafiles, sum(maxbytes) maxbytes, sum(bytes) bytes from dba_data_files group by tablespace_name) reserv,
    (select tablespace_name, sum(bytes) bytes from dba_free_space group by tablespace_name) free
where free.tablespace_name = reserv.tablespace_name;

How to add new elements to an array?

It's also possible to pre-allocate large enough memory size. Here is a simple stack implementation: the program is supposed to output 3 and 5.

class Stk {
    static public final int STKSIZ = 256;
    public int[] info = new int[STKSIZ];
    public int sp = 0; // stack pointer
    public void push(int value) {
        info[sp++] = value;
    }
}
class App {
    public static void main(String[] args) {
        Stk stk = new Stk();
        stk.push(3);
        stk.push(5);
        System.out.println(stk.info[0]);
        System.out.println(stk.info[1]);
    }
}

Error in setting JAVA_HOME

Just remember to add quotes into the path if you have a space in your path to java home. C:\Program Files\java\javaxxx\ doesn't work but "C:\Program Files\java\javaxxx\" does.

Rearrange columns using cut

Using sed

Use sed with basic regular expression's nested subexpressions to capture and reorder the column content. This approach is best suited when there are a limited number of cuts to reorder columns, as in this case.

The basic idea is to surround interesting portions of the search pattern with $ and $, which can be played back in the replacement pattern with \# where # represents the sequential position of the subexpression in the search pattern.

For example:

$ echo "foo bar" | sed "s/\(foo\) \(bar\)/\2 \1/"

yields:

bar foo

Text outside a subexpression is scanned but not retained for playback in the replacement string.

Although the question did not discuss fixed width columns, we will discuss here as this is a worthy measure of any solution posed. For simplicity let's assume the file is space delimited although the solution can be extended for other delimiters.

Collapsing Spaces

To illustrate the simplest usage, let's assume that multiple spaces can be collapsed into single spaces, and the the second column values are terminated with EOL (and not space padded).

File:

bash-3.2$ cat f
Column1    Column2
str1       1
str2       2
str3       3
bash-3.2$ od -a f
0000000    C   o   l   u   m   n   1  sp  sp  sp  sp   C   o   l   u   m
0000020    n   2  nl   s   t   r   1  sp  sp  sp  sp  sp  sp  sp   1  nl
0000040    s   t   r   2  sp  sp  sp  sp  sp  sp  sp   2  nl   s   t   r
0000060    3  sp  sp  sp  sp  sp  sp  sp   3  nl 
0000072

Transform:

bash-3.2$ sed "s/\([^ ]*\)[ ]*\([^ ]*\)[ ]*/\2 \1/" f
Column2 Column1
1 str1
2 str2
3 str3
bash-3.2$ sed "s/\([^ ]*\)[ ]*\([^ ]*\)[ ]*/\2 \1/" f | od -a
0000000    C   o   l   u   m   n   2  sp   C   o   l   u   m   n   1  nl
0000020    1  sp   s   t   r   1  nl   2  sp   s   t   r   2  nl   3  sp
0000040    s   t   r   3  nl
0000045

Preserving Column Widths

Let's now extend the method to a file with constant width columns, while allowing columns to be of differing widths.

File:

bash-3.2$ cat f2
Column1    Column2
str1       1
str2       2
str3       3
bash-3.2$ od -a f2
0000000    C   o   l   u   m   n   1  sp  sp  sp  sp   C   o   l   u   m
0000020    n   2  nl   s   t   r   1  sp  sp  sp  sp  sp  sp  sp   1  sp
0000040   sp  sp  sp  sp  sp  nl   s   t   r   2  sp  sp  sp  sp  sp  sp
0000060   sp   2  sp  sp  sp  sp  sp  sp  nl   s   t   r   3  sp  sp  sp
0000100   sp  sp  sp  sp   3  sp  sp  sp  sp  sp  sp  nl
0000114

Transform:

bash-3.2$ sed "s/\([^ ]*\)\([ ]*\) \([^ ]*\)\([ ]*\)/\3\4 \1\2/" f2
Column2 Column1
1       str1      
2       str2      
3       str3      
bash-3.2$ sed "s/\([^ ]*\)\([ ]*\) \([^ ]*\)\([ ]*\)/\3\4 \1\2/" f2 | od -a
0000000    C   o   l   u   m   n   2  sp   C   o   l   u   m   n   1  sp
0000020   sp  sp  nl   1  sp  sp  sp  sp  sp  sp  sp   s   t   r   1  sp
0000040   sp  sp  sp  sp  sp  nl   2  sp  sp  sp  sp  sp  sp  sp   s   t
0000060    r   2  sp  sp  sp  sp  sp  sp  nl   3  sp  sp  sp  sp  sp  sp
0000100   sp   s   t   r   3  sp  sp  sp  sp  sp  sp  nl 
0000114

Lastly although the question's example does not have strings of unequal length, this sed expression support this case.

File:

bash-3.2$ cat f3
Column1    Column2
str1       1      
string2    2      
str3       3

Transform:

bash-3.2$ sed "s/\([^ ]*\)\([ ]*\) \([^ ]*\)\([ ]*\)/\3\4 \1\2/" f3
Column2 Column1   
1       str1      
2       string2   
3       str3    
bash-3.2$ sed "s/\([^ ]*\)\([ ]*\) \([^ ]*\)\([ ]*\)/\3\4 \1\2/" f3 | od -a
0000000    C   o   l   u   m   n   2  sp   C   o   l   u   m   n   1  sp
0000020   sp  sp  nl   1  sp  sp  sp  sp  sp  sp  sp   s   t   r   1  sp
0000040   sp  sp  sp  sp  sp  nl   2  sp  sp  sp  sp  sp  sp  sp   s   t
0000060    r   i   n   g   2  sp  sp  sp  nl   3  sp  sp  sp  sp  sp  sp
0000100   sp   s   t   r   3  sp  sp  sp  sp  sp  sp  nl 
0000114

Comparison to other methods of column reordering under shell

Surprisingly for a file manipulation tool, awk is not well-suited for cutting from a field to end of record. In sed this can be accomplished using regular expressions, e.g. $xxx.*$$ where xxx is the expression to match the column.
Using paste and cut subshells gets tricky when implementing inside shell scripts. Code that works from the commandline fails to parse when brought inside a shell script. At least this was my experience (which drove me to this approach).

How to determine equality for two JavaScript objects?

It's useful to consider two objects equal if they have all the same values for all properties and recursively for all nested objects and arrays. I also consider the following two objects equal:

var a = {p1: 1};
var b = {p1: 1, p2: undefined};

Similarly, arrays can have "missing" elements and undefined elements. I would treat those the same as well:

var c = [1, 2];
var d = [1, 2, undefined];

A function that implements this definition of equality:

function isEqual(a, b) {
    if (a === b) {
        return true;
    }

    if (generalType(a) != generalType(b)) {
        return false;
    }

    if (a == b) {
        return true;
    }

    if (typeof a != 'object') {
        return false;
    }

    // null != {}
    if (a instanceof Object != b instanceof Object) {
        return false;
    }

    if (a instanceof Date || b instanceof Date) {
        if (a instanceof Date != b instanceof Date ||
            a.getTime() != b.getTime()) {
            return false;
        }
    }

    var allKeys = [].concat(keys(a), keys(b));
    uniqueArray(allKeys);

    for (var i = 0; i < allKeys.length; i++) {
        var prop = allKeys[i];
        if (!isEqual(a[prop], b[prop])) {
            return false;
        }
    }
    return true;
}

Source code (including the helper functions, generalType and uniqueArray): Unit Test and Test Runner here.

How do I import a .bak file into Microsoft SQL Server 2012?

Using the RESTORE DATABASE command most likely. bak is a common extension used for a database backup file. You'll find documentation for this command on MSDN.

What's the difference between the Window.Loaded and Window.ContentRendered events

This is not about the difference between Window.ContentRendered and Window.Loaded but about what how the Window.Loaded event can be used:

I use it to avoid splash screens in all applications which need a long time to come up.

    // initializing my main window
    public MyAppMainWindow()
    {
        InitializeComponent();

        // Set the event
        this.ContentRendered += MyAppMainWindow_ContentRendered;
    }

    private void MyAppMainWindow_ContentRendered(object sender, EventArgs e)
    {
        // ... comes up quick when the controls are loaded and rendered

        // unset the event
        this.ContentRendered -= MyAppMainWindow_ContentRendered;

        // ... make the time comsuming init stuff here
    }

How to "EXPIRE" the "HSET" child key in redis?

You could use the Redis Keyspace Notifications by using psubscribe and "__keyevent@<DB-INDEX>__:expired".

With that, each time that a key will expire, you will get a message published on your redis connection.

Regarding your question basically you create a temporary "normal" key using set with an expiration time in s/ms. It should match the name of the key that you wish to delete in your set.

As your temporary key will be published to your redis connection holding the "__keyevent@0__:expired" when it expired, you can easily delete your key from your original set as the message will have the name of the key.

A simple example in practice on that page : https://medium.com/@micah1powell/using-redis-keyspace-notifications-for-a-reminder-service-with-node-c05047befec3

doc : https://redis.io/topics/notifications ( look for the flag xE)

Javascript return number of days,hours,minutes,seconds between two dates

Just figure out the difference in seconds (don't forget JS timestamps are actually measured in milliseconds) and decompose that value:

// get total seconds between the times
var delta = Math.abs(date_future - date_now) / 1000;

// calculate (and subtract) whole days
var days = Math.floor(delta / 86400);
delta -= days * 86400;

// calculate (and subtract) whole hours
var hours = Math.floor(delta / 3600) % 24;
delta -= hours * 3600;

// calculate (and subtract) whole minutes
var minutes = Math.floor(delta / 60) % 60;
delta -= minutes * 60;

// what's left is seconds
var seconds = delta % 60;  // in theory the modulus is not required

EDIT code adjusted because I just realised that the original code returned the total number of hours, etc, not the number of hours left after counting whole days.

How to create enum like type in TypeScript?

Enums in typescript:

Enums are put into the typescript language to define a set of named constants. Using enums can make our life easier. The reason for this is that these constants are often easier to read than the value which the enum represents.

Creating a enum:

enum Direction {
    Up = 1,
    Down,
    Left,
    Right,
}

This example from the typescript docs explains very nicely how enums work. Notice that our first enum value (Up) is initialized with 1. All the following members of the number enum are then auto incremented from this value (i.e. Down = 2, Left = 3, Right = 4). If we didn't initialize the first value with 1 the enum would start at 0 and then auto increment (i.e. Down = 1, Left = 2, Right = 3).

Using an enum:

We can access the values of the enum in the following manner:

Direction.Up;     // first the enum name, then the dot operator followed by the enum value
Direction.Down;

Notice that this way we are much more descriptive in the way we write our code. Enums basically prevent us from using magic numbers (numbers which represent some entity because the programmer has given a meaning to them in a certain context). Magic numbers are bad because of the following reasons:

We need to think harder, we first need to translate the number to an entity before we can reason about our code.
If we review our code after a long while, or other programmers review our code, they don't necessarily know what is meant with these numbers.

Enum "Inheritance"

another possible solution:

public enum @base
{
    x,
    y,
    z
}

public enum consume
{
    x = @base.x,
    y = @base.y,
    z = @base.z,

    a,b,c
}

// TODO: Add a unit-test to check that if @base and consume are aligned

HTH

Get attribute name value of <input>

var theName;

theName = $("input selector goes here").attr("name");

How to deploy a war file in Tomcat 7

For deploying the war file over tomcat, Follow the below steps :

Stop the tomcat. powershell->services.msc->OK->Apache Tomcat 8.5->stop(on left hand side).

Put the .war file inside E:\Tomcat_Installation\webapps i.e. webapps folder i.e. put.war (put.war is just an example)

After starting the tomcat(to start tomcat powershell->services.msc->OK->Apache Tomcat 8.5->start )

you will get one folder inside E:\Tomcat_Installation\webapps**put**

In this way you can deploy your war file in Apache Tomcat.

Python+OpenCV: cv2.imwrite

Alternatively, with MTCNN and OpenCV(other dependencies including TensorFlow also required), you can:

1 Perform face detection(Input an image, output all boxes of detected faces):

from mtcnn.mtcnn import MTCNN
import cv2

face_detector = MTCNN()

img = cv2.imread("Anthony_Hopkins_0001.jpg")
detect_boxes = face_detector.detect_faces(img)
print(detect_boxes)

[{'box': [73, 69, 98, 123], 'confidence': 0.9996458292007446, 'keypoints': {'left_eye': (102, 116), 'right_eye': (150, 114), 'nose': (129, 142), 'mouth_left': (112, 168), 'mouth_right': (146, 167)}}]

2 save all detected faces to separate files:

for i in range(len(detect_boxes)):
    box = detect_boxes[i]["box"]
    face_img = img[box[1]:(box[1] + box[3]), box[0]:(box[0] + box[2])]
    cv2.imwrite("face-{:03d}.jpg".format(i+1), face_img)

3 or Draw rectangles of all detected faces:

for box in detect_boxes:
    box = box["box"]
    pt1 = (box[0], box[1]) # top left
    pt2 = (box[0] + box[2], box[1] + box[3]) # bottom right
    cv2.rectangle(img, pt1, pt2, (0,255,0), 2)
cv2.imwrite("detected-boxes.jpg", img)

Remove CSS class from element with JavaScript (no jQuery)

function hasClass(ele,cls) {
    return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}

function removeClass(ele,cls) {
        if (hasClass(ele,cls)) {
            var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
            ele.className=ele.className.replace(reg,' ');
        }
    }

Use awk to find average of a column

Your specific error is with line 11:

awk 'BEGIN{sum+=$2}'

This is a line where awk is invoked, and its BEGIN block is specified - but you are already within a awk script, so you do not need to specify awk. Also you want to run sum+=$2 on each line of input, so you do not want it within a BEGIN block. Hence the line should simply read:

sum+=$2

You also do not need the lines:

x=sum
read name

the first just creates a synonym to sum named x and I'm not sure what the second does, but neither are needed.

This would make your awk script:

#!/bin/awk

### This script currently prints the total number of rows processed.
### You must edit this script to print the average of the 2nd column
### instead of the number of rows.

# This block of code is executed for each line in the file
{
    sum+=$2
    # The script should NOT print out a value for each line
}
# The END block is processed after the last line is read
END {
    # NR is a variable equal to the number of rows in the file
    print "Average: " sum/ NR
    # Change this to print the Average instead of just the number of rows
}

Jonathan Leffler's answer gives the awk one liner which represents the same fixed code, with the addition of checking that there are at least 1 lines of input (this stops any divide by zero error). If

How do I get a TextBox to only accept numeric input in WPF?

The Extented WPF Toolkit has one: NumericUpDown enter image description here

Remove everything after a certain character

May be very late party :p

You can use a back reference $'

$' - Inserts the portion of the string that follows the matched substring.

_x000D_

let str = "/Controller/Action?id=11112&value=4444"_x000D_
_x000D_
let output = str.replace(/\?.+/g,"$'")_x000D_
_x000D_
console.log(output)

_x000D_

ORACLE convert number to string

Using the FM format model modifier to get close, as you won't get the trailing zeros after the decimal separator; but you will still get the separator itself, e.g. 50.. You can use rtrim to get rid of that:

select to_char(a, '99D90'),
    to_char(a, '90D90'),
    to_char(a, 'FM90D99'),
    rtrim(to_char(a, 'FM90D99'), to_char(0, 'D'))
from (
    select 50 a from dual
    union all select 50.57 from dual
    union all select 5.57 from dual
    union all select 0.35 from dual
    union all select 0.4 from dual
)
order by a;

TO_CHA TO_CHA TO_CHA RTRIM(
------ ------ ------ ------
   .35   0.35 0.35   0.35
   .40   0.40 0.4    0.4
  5.57   5.57 5.57   5.57
 50.00  50.00 50.    50
 50.57  50.57 50.57  50.57

Note that I'm using to_char(0, 'D') to generate the character to trim, to match the decimal separator - so it looks for the same character, , or ., as the first to_char adds.

The slight downside is that you lose the alignment. If this is being used elsewhere it might not matter, but it does then you can also wrap it in an lpad, which starts to make it look a bit complicated:

...
lpad(rtrim(to_char(a, 'FM90D99'), to_char(0, 'D')), 6)
...

TO_CHA TO_CHA TO_CHA RTRIM( LPAD(RTRIM(TO_CHAR(A,'FM
------ ------ ------ ------ ------------------------
   .35   0.35 0.35   0.35     0.35
   .40   0.40 0.4    0.4       0.4
  5.57   5.57 5.57   5.57     5.57
 50.00  50.00 50.    50         50
 50.57  50.57 50.57  50.57   50.57

Environment Specific application.properties file in Spring Boot application

Spring Boot already has support for profile based properties.

Simply add an application-[profile].properties file and specify the profiles to use using the spring.profiles.active property.

-Dspring.profiles.active=local

This will load the application.properties and the application-local.properties with the latter overriding properties from the first.

Initializing C# auto-properties

You can do it via the constructor of your class:

public class foo {
  public foo(){
    Bar = "bar";
  }
  public string Bar {get;set;}
}

If you've got another constructor (ie, one that takes paramters) or a bunch of constructors you can always have this (called constructor chaining):

public class foo {
  private foo(){
    Bar = "bar";
    Baz = "baz";
  }
  public foo(int something) : this(){
    //do specialized initialization here
    Baz = string.Format("{0}Baz", something);
  }
  public string Bar {get; set;}
  public string Baz {get; set;}
}

If you always chain a call to the default constructor you can have all default property initialization set there. When chaining, the chained constructor will be called before the calling constructor so that your more specialized constructors will be able to set different defaults as applicable.

Return value from exec(@sql)

Was playing with this today... I beleive you can also use @@ROWCOUNT, like this:

DECLARE @SQL VARCHAR(50)
DECLARE @Rowcount INT
SET @SQL = 'SELECT 1 UNION SELECT 2'
EXEC(@SQL)
SET @Rowcount = @@ROWCOUNT
SELECT @Rowcount

Then replace the 'SELECT 1 UNION SELECT 2' with your actual select without the count. I'd suggest just putting 1 in your select, like this:

SELECT 1
FROM dbo.Comm_Services
WHERE....
....

(as opposed to putting SELECT *)

Hope that helps.

How to make an HTTP POST web request

POST request in itself means sending information in the body. I found a fairly simple way to do this. Use Postman by Google, which allows you to specify the content-type(a header field) as application/json and then provide name-value pairs as parameters. Just use your url in the place of theirs.

POST

var responseString = await "http://www.example.com/recepticle.aspx"
    .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
    .ReceiveString();

GET

var responseString = await "http://www.example.com/recepticle.aspx"
    .GetStringAsync();

How to load an external webpage into a div of a html page

Using simple html,

 <div> 
    <object type="text/html" data="http://validator.w3.org/" width="800px" height="600px" style="overflow:auto;border:5px ridge blue">
    </object>
 </div>

Or jquery,

<script>
        $("#mydiv")
            .html('<object data="http://your-website-domain"/>');
</script>

JSFIDDLE DEMO

Datagridview full row selection but get single cell value

Use Cell Click as other methods mentioned will fire upon data binding, not useful if you want the selected value, then the form to close.

private void dgvProducts_CellClick(object sender, DataGridViewCellEventArgs e)
{
    if (dgvProducts.SelectedCells.Count > 0) // Checking to see if any cell is selected
    {
        int mSelectedRowIndex = dgvProducts.SelectedCells[0].RowIndex;

        DataGridViewRow mSelectedRow = dgvProducts.Rows[mSelectedRowIndex];

        string mCatagoryName = Convert.ToString(mSelectedRow.Cells[1].Value);

        SomeOtherMethod(mProductName); // Passing the name to where ever you need it

        this.close();
    }
}

Check if a file is executable

Also seems nobody noticed -x operator on symlinks. A symlink (chain) to a regular file (not classified as executable) fails the test.

Regex for numbers only

Use beginning and end anchors.

 Regex regex = new Regex(@"^\d$");

Use "^\d+$" if you need to match more than one digit.

Make ABC Ordered List Items Have Bold Style

a bit of a cheat, but it works:

HTML:

<ol type="A" style="font-weight: bold;">
  <li><span>Text</span></li>
  <li><span>More text</span></li>
</ol>

CSS:

li span { font-weight: normal; }

What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?

First, you should know what an Optional value is. You can step to The Swift Programming Language for detail.

Second, you should know the optional value has two statuses. One is the full value, and the other is a nil value. So before you implement an optional value, you should check which state it is.

You can use if let ... or guard let ... else and so on.

One other way, if you don't want to check the variable state before your implementation, you can also use var buildingName = buildingName ?? "buildingName" instead.

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