SyntaxFix

Programs & Examples On #Onncpaint

Python - OpenCV - imread - Displaying Image

Looks like the image is too big and the window simply doesn't fit the screen. Create window with the cv2.WINDOW_NORMAL flag, it will make it scalable. Then you can resize it to fit your screen like this:

from __future__ import division
import cv2


img = cv2.imread('1.jpg')

screen_res = 1280, 720
scale_width = screen_res[0] / img.shape[1]
scale_height = screen_res[1] / img.shape[0]
scale = min(scale_width, scale_height)
window_width = int(img.shape[1] * scale)
window_height = int(img.shape[0] * scale)

cv2.namedWindow('dst_rt', cv2.WINDOW_NORMAL)
cv2.resizeWindow('dst_rt', window_width, window_height)

cv2.imshow('dst_rt', img)
cv2.waitKey(0)
cv2.destroyAllWindows()

According to the OpenCV documentation CV_WINDOW_KEEPRATIO flag should do the same, yet it doesn't and it's value not even presented in the python module.

ValueError: not enough values to unpack (expected 11, got 1)

For the line

line.split()

What are you splitting on? Looks like a CSV, so try

line.split(',')

Example:

"one,two,three".split()  # returns one element ["one,two,three"]
"one,two,three".split(',')  # returns three elements ["one", "two", "three"]

As @TigerhawkT3 mentions, it would be better to use the CSV module. Incredibly quick and easy method available here.

How to get file name when user select a file via <input type="file" />?

You can use the next code:

JS

    function showname () {
      var name = document.getElementById('fileInput'); 
      alert('Selected file: ' + name.files.item(0).name);
      alert('Selected file: ' + name.files.item(0).size);
      alert('Selected file: ' + name.files.item(0).type);
    };

HTML

<body>
    <p>
        <input type="file" id="fileInput" multiple onchange="showname()"/>
    </p>    
</body>

How do I find my host and username on mysql?

type this command

select CURRENT_USER();

You will get the username and server

Forking vs. Branching in GitHub

Forking creates an entirely new repository from existing repository (simply doing git clone on gitHub/bitbucket)

Forks are best used: when the intent of the ‘split’ is to create a logically independent project, which may never reunite with its parent.

Branch strategy creates a new branch over the existing/working repository

Branches are best used: when they are created as temporary places to work through a feature, with the intent to merge the branch with the origin.

More Specific :- In open source projects it is the owner of the repository who decides who can push to the repository. However, the idea of open source is that everybody can contribute to the project.

This problem is solved by forks: any time a developer wants to change something in an open source project, they don’t clone the official repository directly. Instead, they fork it to create a copy. When the work is finished, they make a pull request so that the owner of the repository can review the changes and decide whether to merge them to his project.

At its core forking is similar to feature branching, but instead of creating branches a fork of the repository is made, and instead of doing a merge request you create a pull request.

The below links provide the difference in a well-explained manner :

https://blog.gitprime.com/the-definitive-guide-to-forks-and-branches-in-git/

https://buddy.works/blog/5-types-of-git-workflows

http://www.continuousagile.com/unblock/branching.html

When to use throws in a Java method declaration?

You're correct, in that example the throws is superfluous. It's possible that it was left there from some previous implementation - perhaps the exception was originally thrown instead of caught in the catch block.

How to print object array in JavaScript?

Emm... Why not to use something like this?

_x000D_
_x000D_ 
function displayArrayObjects(arrayObjects) {_x000D_
        var len = arrayObjects.length, text = "";_x000D_
_x000D_
        for (var i = 0; i < len; i++) {_x000D_
            var myObject = arrayObjects[i];_x000D_
            _x000D_
            for (var x in myObject) {_x000D_
                text += ( x + ": " + myObject[x] + " ");_x000D_
            }_x000D_
            text += "<br/>";_x000D_
        }_x000D_
_x000D_
        document.getElementById("message").innerHTML = text;_x000D_
    }_x000D_
            _x000D_
            _x000D_
            var lineChartData = [{_x000D_
                date: new Date(2009, 10, 2),_x000D_
                value: 5_x000D_
            }, {_x000D_
                date: new Date(2009, 10, 25),_x000D_
                value: 30_x000D_
            }, {_x000D_
                date: new Date(2009, 10, 26),_x000D_
                value: 72,_x000D_
                customBullet: "images/redstar.png"_x000D_
            }];_x000D_
_x000D_
            displayArrayObjects(lineChartData);
_x000D_ 
<h4 id="message"></h4>
_x000D_
_x000D_
_x000D_

result:

date: Mon Nov 02 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 5 
date: Wed Nov 25 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 30 
date: Thu Nov 26 2009 00:00:00 GMT+0200 (FLE Standard Time) value: 72 customBullet: images/redstar.png

jsfiddle

Printf long long int in C with GCC?

If you are on windows and using mingw, gcc uses the win32 runtime, where printf needs %I64d for a 64 bit integer. (and %I64u for an unsinged 64 bit integer)

For most other platforms you'd use %lld for printing a long long. (and %llu if it's unsigned). This is standarized in C99.

gcc doesn't come with a full C runtime, it defers to the platform it's running on - so the general case is that you need to consult the documentation for your particular platform - independent of gcc.

Excel concatenation quotes

Try this:

CONCATENATE(""""; B2 ;"""")

@widor provided a nice solution alternative too - integrated with mine:

CONCATENATE(char(34); B2 ;char(34))

Prevent HTML5 video from being downloaded (right-click saved)?

You can at least stop the the non-tech savvy people from using the right-click context menu to download your video. You can disable the context menu for any element using the oncontextmenu attribute.

oncontextmenu="return false;"

This works for the body element (whole page) or just a single video using it inside the video tag.

<video oncontextmenu="return false;" controls>...</video>

Ruby send JSON request

 
data = {a: {b: [1, 2]}}.to_json
uri = URI 'https://myapp.com/api/v1/resource'
https = Net::HTTP.new uri.host, uri.port
https.use_ssl = true
https.post2 uri.path, data, 'Content-Type' => 'application/json'

Connecting to remote MySQL server using PHP

This maybe not the answer to poster's question.But this may helpful to people whose face same situation with me:

The client have two network cards,a wireless one and a normal one. The ping to server can be succeed.However telnet serverAddress 3306 would fail. And would complain

Can't connect to MySQL server on 'xxx.xxx.xxx.xxx' (10060)

when try to connect to server.So I forbidden the normal network adapters. And tried telnet serverAddress 3306 it works.And then it work when connect to MySQL server.

Insert multiple lines into a file after specified pattern using shell script

This answer is easy to understand

  • Copy before the pattern
  • Add your lines
  • Copy after the pattern

  • Replace original file

    FILENAME='app/Providers/AuthServiceProvider.php'

STEP 1 copy until the pattern

sed '/THEPATTERNYOUARELOOKINGFOR/Q' $FILENAME >>${FILENAME}_temp

STEP 2 add your lines

cat << 'EOL' >> ${FILENAME}_temp

HERE YOU COPY AND
PASTE MULTIPLE
LINES, ALSO YOU CAN
//WRITE COMMENTS

AND NEW LINES
AND SPECIAL CHARS LIKE $THISONE

EOL

STEP 3 add the rest of the file

grep -A 9999 'THEPATTERNYOUARELOOKINGFOR' $FILENAME >>${FILENAME}_temp

REPLACE original file

mv ${FILENAME}_temp $FILENAME

if you need variables, in step 2 replace 'EOL' with EOL

cat << EOL >> ${FILENAME}_temp

this variable will expand: $variable1

EOL

Difference between Method and Function?

Both are same, there is no difference its just a different term for the same thing in C#.

Method:

In object-oriented programming, a method is a subroutine (or procedure or function) associated with a class.

With respect to Object Oriented programming the term "Method" is used, not functions.

String.strip() in Python

strip removes the whitespace from the beginning and end of the string. If you want the whitespace, don't call strip.

Html table tr inside td

You can solve without nesting tables.

_x000D_
_x000D_ 
<table border="1">_x000D_
    <thead>_x000D_
        <tr>_x000D_
            <th>ABC</th>_x000D_
            <th>ABC</th>_x000D_
            <th colspan="2">ABC</th>_x000D_
            <th>ABC</th>_x000D_
        </tr>_x000D_
    </thead>_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td rowspan="4">Item1</td>_x000D_
            <td rowspan="4">Item1</td>_x000D_
            <td colspan="2">Item1</td>_x000D_
            <td rowspan="4">Item1</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>Name1</td>_x000D_
            <td>Price1</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>Name2</td>_x000D_
            <td>Price2</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>Name3</td>_x000D_
            <td>Price3</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>Item2</td>_x000D_
            <td>Item2</td>_x000D_
            <td colspan="2">Item2</td>_x000D_
            <td>Item2</td>_x000D_
        </tr>_x000D_
    </tbody>_x000D_
</table>
_x000D_
_x000D_
_x000D_

Bootstrap button - remove outline on Chrome OS X

This will remove it - short and clean:

.btn {
    outline: none !important;
}

How do I convert a String to an InputStream in Java?

Like this:

InputStream stream = new ByteArrayInputStream(exampleString.getBytes(StandardCharsets.UTF_8));

Note that this assumes that you want an InputStream that is a stream of bytes that represent your original string encoded as UTF-8.

For versions of Java less than 7, replace StandardCharsets.UTF_8 with "UTF-8".

Regular Expression to find a string included between two characters while EXCLUDING the delimiters

I wanted to find a string between / and #, but # is sometimes optional. Here is the regex I use:

  (?<=\/)([^#]+)(?=#*)

Reading all files in a directory, store them in objects, and send the object

For the code to work smoothy in different enviroments, path.resolve can be used in places where path is manipulated. Here is code which works better.

Reading part:

var fs = require('fs');

function readFiles(dirname, onFileContent, onError) {
  fs.readdir(dirname, function(err, filenames) {
    if (err) {
      onError(err);
      return;
    }
    filenames.forEach(function(filename) {
      fs.readFile(path.resolve(dirname, filename), 'utf-8', function(err, content) {
        if (err) {
          onError(err);
          return;
        }
        onFileContent(filename, content);
      });
    });
  });
}

Storing part:

var data = {};
readFiles(path.resolve(__dirname, 'dirname/'), function(filename, content) {
  data[filename] = content;
}, function(error) {
  throw err;
});

Convert NVARCHAR to DATETIME in SQL Server 2008

As your data is nvarchar there is no guarantee it will convert to datetime (as it may hold invalid date/time information) - so a way to handle this is to use ISDATE which I would use within a cross apply. (Cross apply results are reusable hence making is easier for the output formats.)

|                     YOUR_DT |             SQL2008 |
|-----------------------------|---------------------|
|         2013-08-29 13:55:48 | 29-08-2013 13:55:48 |
|    2013-08-29 13:55:48 blah |              (null) |
| 2013-08-29 13:55:48 rubbish |              (null) |

SELECT
  [Your_Dt]
, convert(varchar, ca1.dt_converted ,105) + ' ' + convert(varchar, ca1.dt_converted ,8) AS sql2008
FROM your_table
CROSS apply ( SELECT CASE WHEN isdate([Your_Dt]) = 1
                        THEN convert(datetime,[Your_Dt])
                        ELSE NULL
                     END
            ) AS ca1 (dt_converted)
;

Notes:

You could also introduce left([Your_Dt],19) to only get a string like '2013-08-29 13:55:48' from '2013-08-29 13:55:48 rubbish'

For that specific output I think you will need 2 sql 2008 date styles (105 & 8) sql2012 added for comparison

declare @your_dt as datetime2
set @your_dt = '2013-08-29 13:55:48'

select
  FORMAT(@your_dt, 'dd-MM-yyyy H:m:s') as sql2012
, convert(varchar, @your_dt ,105) + ' ' + convert(varchar, @your_dt ,8) as sql2008

|             SQL2012 |             SQL2008 |
|---------------------|---------------------|
| 29-08-2013 13:55:48 | 29-08-2013 13:55:48 |

How can I get the "network" time, (from the "Automatic" setting called "Use network-provided values"), NOT the time on the phone?

Now you can get time for the current location but for this you have to set the system's persistent default time zone.setTimeZone(String timeZone) which can be get from

Calendar calendar = Calendar.getInstance();
 long now = calendar.getTimeInMillis();
 TimeZone current = calendar.getTimeZone();

setAutoTimeEnabled(boolean enabled)

Sets whether or not wall clock time should sync with automatic time updates from NTP.

TimeManager timeManager = TimeManager.getInstance();
 // Use 24-hour time
 timeManager.setTimeFormat(TimeManager.FORMAT_24);

 // Set clock time to noon
 Calendar calendar = Calendar.getInstance();
 calendar.set(Calendar.MILLISECOND, 0);
 calendar.set(Calendar.SECOND, 0);
 calendar.set(Calendar.MINUTE, 0);
 calendar.set(Calendar.HOUR_OF_DAY, 12);
 long timeStamp = calendar.getTimeInMillis();
 timeManager.setTime(timeStamp);

I was looking for that type of answer I read your answer but didn't satisfied and it was bit old. I found the new solution and share it. :)

For more information visit: https://developer.android.com/things/reference/com/google/android/things/device/TimeManager.html

Update Eclipse with Android development tools v. 23

is what they are saying about this:

OK, guys, sorry about all this trouble, and we apologize for the messed up releases. Here's the summary:

Starting with ADT bundle 23.0.2, you should be able to update to future versions of ADT.

Source: https://code.google.com/p/android/issues/detail?id=72912

Strangest language feature

This is a lack of a feature which is weird: Python has no switch statement (although workarounds exist).

HTTP redirect: 301 (permanent) vs. 302 (temporary)

Mostly 301 vs 302 is important for indexing in search engines, as their crawlers take this into account and transfer PageRank when using 301.

See Peter Lee's answer for more details.

Reactjs - setting inline styles correctly

You could also try setting style inline without using a variable, like so:

style={{"height" : "100%"}} or,

for multiple attributes: style={{"height" : "100%", "width" : "50%"}}

Convert interface{} to int

You need to do type assertion for converting your interface{} to int value.

iAreaId := val.(int)
iAreaId, ok := val.(int)

More information is available.

Multiple try codes in one block

You could try a for loop


for func,args,kwargs in zip([a,b,c,d], 
                            [args_a,args_b,args_c,args_d],
                            [kw_a,kw_b,kw_c,kw_d]):
    try:
       func(*args, **kwargs)
       break
    except:
       pass

This way you can loop as many functions as you want without making the code look ugly

Difference between Xms and Xmx and XX:MaxPermSize

Java objects reside in an area called the heap, while metadata such as class objects and method objects reside in the permanent generation or Perm Gen area. The permanent generation is not part of the heap.

The heap is created when the JVM starts up and may increase or decrease in size while the application runs. When the heap becomes full, garbage is collected. During the garbage collection objects that are no longer used are cleared, thus making space for new objects.

-Xmssize Specifies the initial heap size.

-Xmxsize Specifies the maximum heap size.

-XX:MaxPermSize=size Sets the maximum permanent generation space size. This option was deprecated in JDK 8, and superseded by the -XX:MaxMetaspaceSize option.

Sizes are expressed in bytes. Append the letter k or K to indicate kilobytes, m or M to indicate megabytes, g or G to indicate gigabytes.

References:

How is the java memory pool divided?

What is perm space?

Java (JVM) Memory Model – Memory Management in Java

Java 7 SE Command Line Options

Java 7 HotSpot VM Options

Android: How to handle right to left swipe gestures

In order to have Click Listener, DoubleClick Listener, OnLongPress Listener, Swipe Left, Swipe Right, Swipe Up, Swipe Down on Single View you need to setOnTouchListener. i.e,

view.setOnTouchListener(new OnSwipeTouchListener(MainActivity.this) {

            @Override
            public void onClick() {
                super.onClick();
                // your on click here
            }

            @Override
            public void onDoubleClick() {
                super.onDoubleClick();
                // your on onDoubleClick here
            }

            @Override
            public void onLongClick() {
                super.onLongClick();
                // your on onLongClick here
            }

            @Override
            public void onSwipeUp() {
                super.onSwipeUp();
                // your swipe up here
            }

            @Override
            public void onSwipeDown() {
                super.onSwipeDown();
                // your swipe down here.
            }

            @Override
            public void onSwipeLeft() {
                super.onSwipeLeft();
                // your swipe left here.
            }

            @Override
            public void onSwipeRight() {
                super.onSwipeRight();
                // your swipe right here.
            }
        });

}

For this you need OnSwipeTouchListener class that implements OnTouchListener.

public class OnSwipeTouchListener implements View.OnTouchListener {

private GestureDetector gestureDetector;

public OnSwipeTouchListener(Context c) {
    gestureDetector = new GestureDetector(c, new GestureListener());
}

public boolean onTouch(final View view, final MotionEvent motionEvent) {
    return gestureDetector.onTouchEvent(motionEvent);
}

private final class GestureListener extends GestureDetector.SimpleOnGestureListener {

    private static final int SWIPE_THRESHOLD = 100;
    private static final int SWIPE_VELOCITY_THRESHOLD = 100;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        onClick();
        return super.onSingleTapUp(e);
    }

    @Override
    public boolean onDoubleTap(MotionEvent e) {
        onDoubleClick();
        return super.onDoubleTap(e);
    }

    @Override
    public void onLongPress(MotionEvent e) {
        onLongClick();
        super.onLongPress(e);
    }

    // Determines the fling velocity and then fires the appropriate swipe event accordingly
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        boolean result = false;
        try {
            float diffY = e2.getY() - e1.getY();
            float diffX = e2.getX() - e1.getX();
            if (Math.abs(diffX) > Math.abs(diffY)) {
                if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffX > 0) {
                        onSwipeRight();
                    } else {
                        onSwipeLeft();
                    }
                }
            } else {
                if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                        onSwipeDown();
                    } else {
                        onSwipeUp();
                    }
                }
            }
        } catch (Exception exception) {
            exception.printStackTrace();
        }
        return result;
    }
}

public void onSwipeRight() {
}

public void onSwipeLeft() {
}

public void onSwipeUp() {
}

public void onSwipeDown() {
}

public void onClick() {

}

public void onDoubleClick() {

}

public void onLongClick() {

}
}

C# Regex for Guid

In .NET Framework 4 there is enhancement System.Guid structure, These includes new TryParse and TryParseExact methods to Parse GUID. Here is example for this.

    //Generate New GUID
    Guid objGuid = Guid.NewGuid();
    //Take invalid guid format
    string strGUID = "aaa-a-a-a-a";

    Guid newGuid;

    if (Guid.TryParse(objGuid.ToString(), out newGuid) == true)
    {
        Response.Write(string.Format("<br/>{0} is Valid GUID.", objGuid.ToString()));
    }
    else
    {
        Response.Write(string.Format("<br/>{0} is InValid GUID.", objGuid.ToString()));
    }


    Guid newTmpGuid;

    if (Guid.TryParse(strGUID, out newTmpGuid) == true)
    {
        Response.Write(string.Format("<br/>{0} is Valid GUID.", strGUID));
    }
    else
    {
        Response.Write(string.Format("<br/>{0} is InValid GUID.", strGUID));
    }

In this example we create new guid object and also take one string variable which has invalid guid. After that we use TryParse method to validate that both variable has valid guid format or not. By running example you can see that string variable has not valid guid format and it gives message of "InValid guid". If string variable has valid guid than this will return true in TryParse method.

Easy way to turn JavaScript array into comma-separated list?

There are many methods to convert an array to comma separated list

1. Using array#join

From MDN

The join() method joins all elements of an array (or an array-like object) into a string.

The code

var arr = ["this","is","a","comma","separated","list"];
arr = arr.join(",");

Snippet

_x000D_
_x000D_ 
var arr = ["this", "is", "a", "comma", "separated", "list"];_x000D_
arr = arr.join(",");_x000D_
console.log(arr);
_x000D_
_x000D_
_x000D_

2. Using array#toString

From MDN

The toString() method returns a string representing the specified array and its elements.

The code

var arr = ["this","is","a","comma","separated","list"];
arr = arr.toString();

Snippet

_x000D_
_x000D_ 
var arr = ["this", "is", "a", "comma", "separated", "list"];_x000D_
arr = arr.toString();_x000D_
console.log(arr);
_x000D_
_x000D_
_x000D_

3. Add []+ before array or +[] after an array

The []+ or +[] will convert it into a string

Proof

([]+[] === [].toString())

will output true

_x000D_
_x000D_ 
console.log([]+[] === [].toString());
_x000D_
_x000D_
_x000D_ 

var arr = ["this","is","a","comma","separated","list"];
arr = []+arr;

Snippet

_x000D_
_x000D_ 
var arr = ["this", "is", "a", "comma", "separated", "list"];_x000D_
arr = []+arr;_x000D_
console.log(arr);
_x000D_
_x000D_
_x000D_

Also

var arr = ["this","is","a","comma","separated","list"];
arr = arr+[];

_x000D_
_x000D_ 
var arr = ["this", "is", "a", "comma", "separated", "list"];_x000D_
arr = arr + [];_x000D_
console.log(arr);
_x000D_
_x000D_
_x000D_

Convert Char to String in C

You could do many of the given answers, but if you just want to do it to be able to use it with strcpy, then you could do the following:

...
    strcpy( ... , (char[2]) { (char) c, '\0' } );
...

The (char[2]) { (char) c, '\0' } part will temporarily generate null-terminated string out of a character c.

This way you could avoid creating new variables for something that you already have in your hands, provided that you'll only need that single-character string just once.

Add attribute 'checked' on click jquery

It seems this is one of the rare occasions on which use of an attribute is actually appropriate. jQuery's attr() method will not help you because in most cases (including this) it actually sets a property, not an attribute, making the choice of its name look somewhat foolish. [UPDATE: Since jQuery 1.6.1, the situation has changed slightly]

IE has some problems with the DOM setAttribute method but in this case it should be fine:

this.setAttribute("checked", "checked");

In IE, this will always actually make the checkbox checked. In other browsers, if the user has already checked and unchecked the checkbox, setting the attribute will have no visible effect. Therefore, if you want to guarantee the checkbox is checked as well as having the checked attribute, you need to set the checked property as well:

this.setAttribute("checked", "checked");
this.checked = true;

To uncheck the checkbox and remove the attribute, do the following:

this.setAttribute("checked", ""); // For IE
this.removeAttribute("checked"); // For other browsers
this.checked = false;

Sql Server string to date conversion

Run this through your query processor. It formats dates and/or times like so and one of these should give you what you're looking for. It wont be hard to adapt: 

Declare @d datetime
select @d = getdate()

select @d as OriginalDate,
convert(varchar,@d,100) as ConvertedDate,
100 as FormatValue,
'mon dd yyyy hh:miAM (or PM)' as OutputFormat
union all
select @d,convert(varchar,@d,101),101,'mm/dd/yy'
union all
select @d,convert(varchar,@d,102),102,'yy.mm.dd'
union all
select @d,convert(varchar,@d,103),103,'dd/mm/yy'
union all
select @d,convert(varchar,@d,104),104,'dd.mm.yy'
union all
select @d,convert(varchar,@d,105),105,'dd-mm-yy'
union all
select @d,convert(varchar,@d,106),106,'dd mon yy'
union all
select @d,convert(varchar,@d,107),107,'Mon dd, yy'
union all
select @d,convert(varchar,@d,108),108,'hh:mm:ss'
union all
select @d,convert(varchar,@d,109),109,'mon dd yyyy hh:mi:ss:mmmAM (or PM)'
union all
select @d,convert(varchar,@d,110),110,'mm-dd-yy'
union all
select @d,convert(varchar,@d,111),111,'yy/mm/dd'
union all
select @d,convert(varchar,@d,12),12,'yymmdd'
union all
select @d,convert(varchar,@d,112),112,'yyyymmdd'
union all
select @d,convert(varchar,@d,113),113,'dd mon yyyy hh:mm:ss:mmm(24h)'
union all
select @d,convert(varchar,@d,114),114,'hh:mi:ss:mmm(24h)'
union all
select @d,convert(varchar,@d,120),120,'yyyy-mm-dd hh:mi:ss(24h)'
union all
select @d,convert(varchar,@d,121),121,'yyyy-mm-dd hh:mi:ss.mmm(24h)'
union all
select @d,convert(varchar,@d,126),126,'yyyy-mm-dd Thh:mm:ss:mmm(no spaces)'

This declaration has no storage class or type specifier in C++

You can declare an object of a class in another Class,that's possible but you cant initialize that object. For that you need to do something like this :--> (inside main)

Orderbook o1;
o1.m.check(side)

but that would be unnecessary. Keeping things short :-

You can't call functions inside a Class

What is the difference between iterator and iterable and how to use them?

The most important consideration is whether the item in question should be able to be traversed more than once. This is because you can always rewind an Iterable by calling iterator() again, but there is no way to rewind an Iterator.

Sorting a vector in descending order

What about this?

std::sort(numbers.begin(), numbers.end());
std::reverse(numbers.begin(), numbers.end());

Make view 80% width of parent in React Native

The easiest way to achieve is by applying width to view.

width: '80%'

What is "pom" packaging in maven?

To simply answer your question when you do a mvn:install, maven will create a packaged artifact based on (packaging attribute in pom.xml), After you run your maven install you can find the file with .package extension

  • In target directory of the project workspace
  • Also where your maven 2 local repository is search for (.m2/respository) on your box, Your artifact is listed in .m2 repository under (groupId/artifactId/artifactId-version.packaging) directory
  • If you look under the directory you will find packaged extension file and also pom extension (pom extension is basically the pom.xml used to generate this package)
  • If your maven project is multi-module each module will two files as described above except for the top level project that will only have a pom

adb command not found in linux environment

You need to add $ANDROID_SDK/platform-tools to your PATH, where $ANDROID_SDK is wherever you installed the Android SDK.

Error java.lang.OutOfMemoryError: GC overhead limit exceeded

Solved:
Just add
org.gradle.jvmargs=-Xmx1024m
in
gradle.properties
and if it does not exist, create it.

How to get SQL from Hibernate Criteria API (*not* for logging)

Here is a method I used and worked for me

public static String toSql(Session session, Criteria criteria){
    String sql="";
    Object[] parameters = null;
    try{
        CriteriaImpl c = (CriteriaImpl) criteria;
        SessionImpl s = (SessionImpl)c.getSession();
        SessionFactoryImplementor factory = (SessionFactoryImplementor)s.getSessionFactory();
        String[] implementors = factory.getImplementors( c.getEntityOrClassName() );
        CriteriaLoader loader = new CriteriaLoader((OuterJoinLoadable)factory.getEntityPersister(implementors[0]), factory, c, implementors[0], s.getEnabledFilters());
        Field f = OuterJoinLoader.class.getDeclaredField("sql");
        f.setAccessible(true);
        sql = (String)f.get(loader);
        Field fp = CriteriaLoader.class.getDeclaredField("traslator");
        fp.setAccessible(true);
        CriteriaQueryTranslator translator = (CriteriaQueryTranslator) fp.get(loader);
        parameters = translator.getQueryParameters().getPositionalParameterValues();
    }
    catch(Exception e){
        throw new RuntimeException(e);
    }
    if (sql !=null){
        int fromPosition = sql.indexOf(" from ");
        sql = "SELECT * "+ sql.substring(fromPosition);

        if (parameters!=null && parameters.length>0){
            for (Object val : parameters) {
                String value="%";
                if(val instanceof Boolean){
                    value = ((Boolean)val)?"1":"0";
                }else if (val instanceof String){
                    value = "'"+val+"'";
                }
                sql = sql.replaceFirst("\\?", value);
            }
        }
    }
    return sql.replaceAll("left outer join", "\nleft outer join").replace(" and ", "\nand ").replace(" on ", "\non ");
}

R numbers from 1 to 100

If you need the construct for a quick example to play with, use the : operator.

But if you are creating a vector/range of numbers dynamically, then use seq() instead.

Let's say you are creating the vector/range of numbers from a to b with a:b, and you expect it to be an increasing series. Then, if b is evaluated to be less than a, you will get a decreasing sequence but you will never be notified about it, and your program will continue to execute with the wrong kind of input.

In this case, if you use seq(), you can set the sign of the by argument to match the direction of your sequence, and an error will be raised if they do not match. For example, 

seq(a, b, -1)

will raise an error for a=2, b=6, because the coder expected a decreasing sequence.

Unable to connect with remote debugger

I had a similar issue that led me to this question. In my browser debugger I was getting this error message:

Access to fetch at 'http://localhost:8081/index.delta?platform=android&dev=true&minify=false' from origin 'http://127.0.0.1:8081' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

It took me awhile to realize I was using 127.0.0.1:8081 instead of localhost:8081 for my debugger.

To fix it, I simply had to change Chrome from:

http://127.0.0.1:8081/debugger-ui/

to

http://localhost:8081/debugger-ui/

Which versions of SSL/TLS does System.Net.WebRequest support?

When using System.Net.WebRequest your application will negotiate with the server to determine the highest TLS version that both your application and the server support, and use this. You can see more details on how this works here:

http://en.wikipedia.org/wiki/Transport_Layer_Security#TLS_handshake

If the server doesn't support TLS it will fallback to SSL, therefore it could potentially fallback to SSL3. You can see all of the versions that .NET 4.5 supports here:

http://msdn.microsoft.com/en-us/library/system.security.authentication.sslprotocols(v=vs.110).aspx

In order to prevent your application being vulnerable to POODLE, you can disable SSL3 on the machine that your application is running on by following this explanation:

https://serverfault.com/questions/637207/on-iis-how-do-i-patch-the-ssl-3-0-poodle-vulnerability-cve-2014-3566

regex string replace

This should work :

str = str.replace(/[^a-z0-9-]/g, '');

Everything between the indicates what your are looking for

  1. / is here to delimit your pattern so you have one to start and one to end
  2. [] indicates the pattern your are looking for on one specific character
  3. ^ indicates that you want every character NOT corresponding to what follows
  4. a-z matches any character between 'a' and 'z' included
  5. 0-9 matches any digit between '0' and '9' included (meaning any digit)
  6. - the '-' character
  7. g at the end is a special parameter saying that you do not want you regex to stop on the first character matching your pattern but to continue on the whole string

Then your expression is delimited by / before and after. So here you say "every character not being a letter, a digit or a '-' will be removed from the string".

minimize app to system tray

This is the method I use in my applications, it's fairly simple and self explanatory but I'm happy to give more details in answer to your comments.

    public Form1()
    {
        InitializeComponent();

        // When window state changed, trigger state update.
        this.Resize += SetMinimizeState;

        // When tray icon clicked, trigger window state change.       
        systemTrayIcon.Click += ToggleMinimizeState;
    }      

    // Toggle state between Normal and Minimized.
    private void ToggleMinimizeState(object sender, EventArgs e)
    {    
        bool isMinimized = this.WindowState == FormWindowState.Minimized;
        this.WindowState = (isMinimized) ? FormWindowState.Normal : FormWindowState.Minimized;
    }

    // Show/Hide window and tray icon to match window state.
    private void SetMinimizeState(object sender, EventArgs e)
    {    
        bool isMinimized = this.WindowState == FormWindowState.Minimized;

        this.ShowInTaskbar = !isMinimized;           
        systemTrayIcon.Visible = isMinimized;
        if (isMinimized) systemTrayIcon.ShowBalloonTip(500, "Application", "Application minimized to tray.", ToolTipIcon.Info);
    }

JList add/remove Item

The problem is

listModel.addElement(listaRosa.getSelectedValue());
listModel.removeElement(listaRosa.getSelectedValue());

you may be adding an element and immediatly removing it since both add and remove operations are on the same listModel.

Try

private void aggiungiTitolareButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                       

    DefaultListModel lm2 = (DefaultListModel) listaTitolari.getModel();
    DefaultListModel lm1  = (DefaultListModel) listaRosa.getModel();
    if(lm2 == null)
    {
        lm2 = new DefaultListModel();
        listaTitolari.setModel(lm2);
    }
    lm2.addElement(listaTitolari.getSelectedValue());
    lm1.removeElement(listaTitolari.getSelectedValue());        
}

OnChange event handler for radio button (INPUT type="radio") doesn't work as one value

Store the previous checked radio in a variable:
http://jsfiddle.net/dsbonev/C5S4B/

HTML

<input type="radio" name="myRadios" value="1" /> 1
<input type="radio" name="myRadios" value="2" /> 2
<input type="radio" name="myRadios" value="3" /> 3
<input type="radio" name="myRadios" value="4" /> 4
<input type="radio" name="myRadios" value="5" /> 5

JS

var changeHandler = (function initChangeHandler() {
    var previousCheckedRadio = null;

    var result = function (event) {
        var currentCheckedRadio = event.target;
        var name = currentCheckedRadio.name;

        if (name !== 'myRadios') return;

        //using radio elements previousCheckedRadio and currentCheckedRadio

        //storing radio element for using in future 'change' event handler
        previousCheckedRadio = currentCheckedRadio;
    };

    return result;
})();

document.addEventListener('change', changeHandler, false);

JS EXAMPLE CODE

var changeHandler = (function initChangeHandler() {
    var previousCheckedRadio = null;

    function logInfo(info) {
        if (!console || !console.log) return;

        console.log(info);
    }

    function logPrevious(element) {
        if (!element) return;

        var message = element.value + ' was unchecked';

        logInfo(message);
    }

    function logCurrent(element) {
        if (!element) return;

        var message = element.value + ' is checked';

        logInfo(message);
    }

    var result = function (event) {
        var currentCheckedRadio = event.target;
        var name = currentCheckedRadio.name;

        if (name !== 'myRadios') return;

        logPrevious(previousCheckedRadio);
        logCurrent(currentCheckedRadio);

        previousCheckedRadio = currentCheckedRadio;
    };

    return result;
})();

document.addEventListener('change', changeHandler, false);

What does "exec sp_reset_connection" mean in Sql Server Profiler?

Like the other answers said, sp_reset_connection indicates that connection pool is being reused. Be aware of one particular consequence!

Jimmy Mays' MSDN Blog said:

sp_reset_connection does NOT reset the transaction isolation level to the server default from the previous connection's setting.

UPDATE: Starting with SQL 2014, for client drivers with TDS version 7.3 or higher, the transaction isolation levels will be reset back to the default.

ref: SQL Server: Isolation level leaks across pooled connections

Here is some additional information:

What does sp_reset_connection do?

Data access API's layers like ODBC, OLE-DB and System.Data.SqlClient all call the (internal) stored procedure sp_reset_connection when re-using a connection from a connection pool. It does this to reset the state of the connection before it gets re-used, however nowhere is documented what things get reset. This article tries to document the parts of the connection that get reset.

sp_reset_connection resets the following aspects of a connection:

  • All error states and numbers (like @@error)

  • Stops all EC's (execution contexts) that are child threads of a parent EC executing a parallel query

  • Waits for any outstanding I/O operations that is outstanding

  • Frees any held buffers on the server by the connection

  • Unlocks any buffer resources that are used by the connection

  • Releases all allocated memory owned by the connection

  • Clears any work or temporary tables that are created by the connection

  • Kills all global cursors owned by the connection

  • Closes any open SQL-XML handles that are open

  • Deletes any open SQL-XML related work tables

  • Closes all system tables

  • Closes all user tables

  • Drops all temporary objects

  • Aborts open transactions

  • Defects from a distributed transaction when enlisted

  • Decrements the reference count for users in current database which releases shared database locks

  • Frees acquired locks

  • Releases any acquired handles

  • Resets all SET options to the default values

  • Resets the @@rowcount value

  • Resets the @@identity value

  • Resets any session level trace options using dbcc traceon()

  • Resets CONTEXT_INFO to NULL in SQL Server 2005 and newer [ not part of the original article ]

sp_reset_connection will NOT reset:

  • Security context, which is why connection pooling matches connections based on the exact connection string

  • Application roles entered using sp_setapprole, since application roles could not be reverted at all prior to SQL Server 2005. Starting in SQL Server 2005, app roles can be reverted, but only with additional information that is not part of the session. Before closing the connection, application roles need to be manually reverted via sp_unsetapprole using a "cookie" value that is captured when sp_setapprole is executed.

Note: I am including the list here as I do not want it to be lost in the ever transient web.

Submit form and stay on same page?

99% of the time I would use XMLHttpRequest or fetch for something like this. However, there's an alternative solution which doesn't require javascript...

You could include a hidden iframe on your page and set the target attribute of your form to point to that iframe.

<style>
  .hide { position:absolute; top:-1px; left:-1px; width:1px; height:1px; }
</style>

<iframe name="hiddenFrame" class="hide"></iframe>

<form action="receiver.pl" method="post" target="hiddenFrame">
  <input name="signed" type="checkbox">
  <input value="Save" type="submit">
</form>

There are very few scenarios where I would choose this route. Generally handling it with javascript is better because, with javascript you can...

  • gracefully handle errors (e.g. retry)
  • provide UI indicators (e.g. loading, processing, success, failure)
  • run logic before the request is sent, or run logic after the response is received.

Hard reset of a single file

You can use the following command:

git checkout HEAD -- my-file.txt

... which will update both the working copy of my-file.txt and its state in the index with that from HEAD.

-- basically means: treat every argument after this point as a file name. More details in this answer. Thanks to VonC for pointing this out.

Created Button Click Event c#

if your button is inside your form class:

buttonOk.Click += new EventHandler(your_click_method);

(might not be exactly EventHandler)

and in your click method:

this.Close();

If you need to show a message box:

MessageBox.Show("test");

Create a sample login page using servlet and JSP?

You're comparing the message with the empty string using ==.

First, your comparison is wrong because the message will be null (and not the empty string).

Second, it's wrong because Objects must be compared with equals() and not with ==.

Third, it's wrong because you should avoid scriptlets in JSP, and use the JSP EL, the JSTL, and other custom tags instead:

<c:id test="${!empty message}">
    <c:out value="${message}"/>
</c:if>

<button> vs. <input type="button" />. Which to use?

Quoting the Forms Page in the HTML manual:

Buttons created with the BUTTON element function just like buttons created with the INPUT element, but they offer richer rendering possibilities: the BUTTON element may have content. For example, a BUTTON element that contains an image functions like and may resemble an INPUT element whose type is set to "image", but the BUTTON element type allows content.

MVC Calling a view from a different controller

I'm not really sure if I got your question right. Maybe something like

public class CommentsController : Controller
{
    [HttpPost]
    public ActionResult WriteComment(CommentModel comment)
    {
        // Do the basic model validation and other stuff
        try
        {
            if (ModelState.IsValid )
            {
                 // Insert the model to database like:
                 db.Comments.Add(comment);
                 db.SaveChanges();

                 // Pass the comment's article id to the read action
                 return RedirectToAction("Read", "Articles", new {id = comment.ArticleID});
            }
        }
        catch ( Exception e )
        {
             throw e;
        }
        // Something went wrong
        return View(comment);

    }
}


public class ArticlesController : Controller
{
    // id is the id of the article
    public ActionResult Read(int id)
    {
        // Get the article from database by id
        var model = db.Articles.Find(id);
        // Return the view
        return View(model);
    }
}

Angular and Typescript: Can't find names - Error: cannot find name

add typing.d.ts in main folder of the application and over there declare the varible which you want to use every time

declare var System: any;
declare var require: any;

after declaring this in typing.d.ts, error for require will not come in the application..

This certificate has an invalid issuer Apple Push Services

You need to search the World from the top right search bar and delete the expired certificate. Make sure you selected Login and All items.

Enter image description here

List<Object> and List<?>

To answer your second question, yes, you can cast the List<?> as a List<Object> or a List<T> of any type, since the ? (Wildcard) parameter indicates that the list contains a homogenous collection of an any Object. However, there's no way to know at compile what the type is since it's part of the exported API only - meaning you can't see what's being inserted into the List<?>.

Here's how you would make the cast:

List<?> wildcardList = methodThatReturnsWildcardList();
// generates Unchecked cast compiler warning
List<Object> objectReference = (List<Object>)wildcardList;

In this case you can ignore the warning because in order for an object to be used in a generic class it must be a subtype of Object. Let's pretend that we're trying to cast this as a List<Integer> when it actually contains a collection of Strings.

// this code will compile safely
List<?> wildcardList = methodThatReturnsWildcardList();
List<Integer> integerReference = (List<Integer>)wildcardList;

// this line will throw an invalid cast exception for any type other than Integer
Integer myInteger = integerRefence.get(0);

Remember: generic types are erased at runtime. You won't know what the collection contains, but you can get an element and call .getClass() on it to determine its type.

Class objectClass = wildcardList.get(0).getClass();

Error Code: 1062. Duplicate entry '1' for key 'PRIMARY'

The problem is related with your file - you are trying to create a DB using a copy - at the top of your file you will find something like this:

CREATE DATABASE IF NOT EXISTS *THE_NAME_OF_YOUR_DB* DEFAULT CHARACTER SET latin1 COLLATE latin1_general_ci; USE *THE_NAME_OF_YOUR_DB*;

and I'm sure that you already have a DB with this name - IN THE SAME SERVER - please check. Just change the name OR ERASE THIS LINE!

git add remote branch

If the remote branch already exists then you can (probably) get away with..

git checkout branch_name

and git will automatically set up to track the remote branch with the same name on origin.

Function to calculate distance between two coordinates

I implemeneted this algorithm in typescript and ES6

export type Coordinate = {
  lat: number;
  lon: number;
};

get the distance between two points:

function getDistanceBetweenTwoPoints(cord1: Coordinate, cord2: Coordinate) {
  if (cord1.lat == cord2.lat && cord1.lon == cord2.lon) {
    return 0;
  }

  const radlat1 = (Math.PI * cord1.lat) / 180;
  const radlat2 = (Math.PI * cord2.lat) / 180;

  const theta = cord1.lon - cord2.lon;
  const radtheta = (Math.PI * theta) / 180;

  let dist =
    Math.sin(radlat1) * Math.sin(radlat2) +
    Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);

  if (dist > 1) {
    dist = 1;
  }

  dist = Math.acos(dist);
  dist = (dist * 180) / Math.PI;
  dist = dist * 60 * 1.1515;
  dist = dist * 1.609344; //convert miles to km
  
  return dist;
}

get the distance between an array of coordinates

export function getTotalDistance(coordinates: Coordinate[]) {
  coordinates = coordinates.filter((cord) => {
    if (cord.lat && cord.lon) {
      return true;
    }
  });
  
  let totalDistance = 0;

  if (!coordinates) {
    return 0;
  }

  if (coordinates.length < 2) {
    return 0;
  }

  for (let i = 0; i < coordinates.length - 2; i++) {
    if (
      !coordinates[i].lon ||
      !coordinates[i].lat ||
      !coordinates[i + 1].lon ||
      !coordinates[i + 1].lat
    ) {
      totalDistance = totalDistance;
    }
    totalDistance =
      totalDistance +
      getDistanceBetweenTwoPoints(coordinates[i], coordinates[i + 1]);
  }

  return totalDistance.toFixed(2);
}

Setting a property with an EventTrigger

Stopping the Storyboard can be done in the code behind, or the xaml, depending on where the need comes from.

If the EventTrigger is moved outside of the button, then we can go ahead and target it with another EventTrigger that will tell the storyboard to stop. When the storyboard is stopped in this manner it will not revert to the previous value.

Here I've moved the Button.Click EventTrigger to a surrounding StackPanel and added a new EventTrigger on the the CheckBox.Click to stop the Button's storyboard when the CheckBox is clicked. This lets us check and uncheck the CheckBox when it is clicked on and gives us the desired unchecking behavior from the button as well.

    <StackPanel x:Name="myStackPanel">

        <CheckBox x:Name="myCheckBox"
                  Content="My CheckBox" />

        <Button Content="Click to Uncheck"
                x:Name="myUncheckButton" />

        <Button Content="Click to check the box in code."
                Click="OnClick" />

        <StackPanel.Triggers>

            <EventTrigger RoutedEvent="Button.Click"
                          SourceName="myUncheckButton">
                <EventTrigger.Actions>
                    <BeginStoryboard x:Name="myBeginStoryboard">
                        <Storyboard x:Name="myStoryboard">
                            <BooleanAnimationUsingKeyFrames Storyboard.TargetName="myCheckBox"
                                                            Storyboard.TargetProperty="IsChecked">
                                <DiscreteBooleanKeyFrame KeyTime="00:00:00"
                                                         Value="False" />
                            </BooleanAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger.Actions>
            </EventTrigger>

            <EventTrigger RoutedEvent="CheckBox.Click"
                          SourceName="myCheckBox">
                <EventTrigger.Actions>
                    <StopStoryboard BeginStoryboardName="myBeginStoryboard" />
                </EventTrigger.Actions>
            </EventTrigger>

        </StackPanel.Triggers>
    </StackPanel>

To stop the storyboard in the code behind, we will have to do something slightly different. The third button provides the method where we will stop the storyboard and set the IsChecked property back to true through code.

We can't call myStoryboard.Stop() because we did not begin the Storyboard through the code setting the isControllable parameter. Instead, we can remove the Storyboard. To do this we need the FrameworkElement that the storyboard exists on, in this case our StackPanel. Once the storyboard is removed, we can once again set the IsChecked property with it persisting to the UI.

    private void OnClick(object sender, RoutedEventArgs e)
    {
        myStoryboard.Remove(myStackPanel);
        myCheckBox.IsChecked = true;
    }

BAT file to open CMD in current directory

Create a new file startCmdLine.bat in your directory and put this line in it

call cmd

That is it. Now double click on the .bat file. It works for me.

You can replace call with start, it will also work.

Carousel with Thumbnails in Bootstrap 3.0

@Skelly 's answer is correct. It won't let me add a comment (<50 rep)... but to answer your question on his answer: In the example he linked, if you add

col-xs-3

class to each of the thumbnails, like this:

class="col-md-3 col-xs-3"

then it should stay the way you want it when sized down to phone width.

How to use JavaScript regex over multiple lines?

Now there's the s (single line) modifier, that lets the dot matches new lines as well :) \s will also match new lines :D

Just add the s behind the slash

 /<pre.*?<\/pre>/gms

How do I pass multiple parameters into a function in PowerShell?

If you don't know (or care) how many arguments you will be passing to the function, you could also use a very simple approach like;

Code:

function FunctionName()
{
    Write-Host $args
}

That would print out all arguments. For example:

FunctionName a b c 1 2 3

Output

a b c 1 2 3

I find this particularly useful when creating functions that use external commands that could have many different (and optional) parameters, but relies on said command to provide feedback on syntax errors, etc.

Here is a another real-world example (creating a function to the tracert command, which I hate having to remember the truncated name);

Code:

Function traceroute
{
    Start-Process -FilePath "$env:systemroot\system32\tracert.exe" -ArgumentList $args -NoNewWindow
}

Defining a percentage width for a LinearLayout?

*You can use layout_weight properties. If you want to take 70% of parent width you must set child layout_width property value 0dp, like android:layout_width="0dp"*

Python datetime to string without microsecond component

As of Python 3.6+, the best way of doing this is by the new timespec argument for isoformat.

isoformat(timespec='seconds', sep=' ')

Usage:

>>> datetime.now().isoformat(timespec='seconds')
'2020-10-16T18:38:21'
>>> datetime.now().isoformat(timespec='seconds', sep=' ')
'2020-10-16 18:38:35'

How to get current time with jQuery

You may try like this:

new Date($.now());

Also using Javascript you can do like this:

_x000D_
_x000D_ 
var dt = new Date();_x000D_
var time = dt.getHours() + ":" + dt.getMinutes() + ":" + dt.getSeconds();_x000D_
document.write(time);
_x000D_
_x000D_
_x000D_

Using an array as needles in strpos

str_replace is considerably faster.

$find_letters = array('a', 'c', 'd');
$string = 'abcdefg';
$match = (str_replace($find_letters, '', $string) != $string);

Get a resource using getResource()

Instead of explicitly writing the class name you could use

this.getClass().getResource("/unibo/lsb/res/dice.jpg");

generate random string for div id

Here is the reusable function to generate the random IDs :

function revisedRandId() {
     return Math.random().toString(36).replace(/[^a-z]+/g, '').substr(2, 10);
}

// It will not start with the any number digit so it will be supported by CSS3

How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame

 
temp$quartile <- ceiling(sapply(temp$value,function(x) sum(x-temp$value>=0))/(length(temp$value)/4))

How to run Gulp tasks sequentially one after the other

I generated a node/gulp app using the generator-gulp-webapp Yeoman generator. It handled the "clean conundrum" this way (translating to the original tasks mentioned in the question):

gulp.task('develop', ['clean'], function () {
  gulp.start('coffee');
});

gradlew command not found?

Gradle wrapper needs to be built. Try running gradle wrapper --gradle-version 2.13 Remember to change 2.13 to your gradle version number. After running this command, you should see new scripts added to your project folder. You should be able to run the wrapper with ./gradlew build to build your code. Please refer to this guid for more information https://spring.io/guides/gs/gradle/.

Best way to encode text data for XML

System.XML handles the encoding for you, so you don't need a method like this.

How to get an object's properties in JavaScript / jQuery?

Scanning object for first intance of a determinated prop:

var obj = {a:'Saludos',
            b:{b_1:{b_1_1:'Como estas?',b_1_2:'Un gusto conocerte'}},
           d:'Hasta luego'
            }
function scan (element,list){
    var res;
    if (typeof(list) != 'undefined'){
        if (typeof(list) == 'object'){
            for(key in list){
               if (typeof(res) == 'undefined'){
                res = (key == element)?list[key]:scan(element,list[key]);
               }
            });
        }
    }
    return res;
}
console.log(scan('a',obj));

Getters \ setters for dummies

I've got one for you guys that might be a little ugly, but it does get'er done across platforms

function myFunc () {

var _myAttribute = "default";

this.myAttribute = function() {
    if (arguments.length > 0) _myAttribute = arguments[0];
    return _myAttribute;
}
}

this way, when you call

var test = new myFunc();
test.myAttribute(); //-> "default"
test.myAttribute("ok"); //-> "ok"
test.myAttribute(); //-> "ok"

If you really want to spice things up.. you can insert a typeof check:

if (arguments.length > 0 && typeof arguments[0] == "boolean") _myAttribute = arguments[0];
if (arguments.length > 0 && typeof arguments[0] == "number") _myAttribute = arguments[0];
if (arguments.length > 0 && typeof arguments[0] == "string") _myAttribute = arguments[0];

or go even crazier with the advanced typeof check: type.of() code at codingforums.com

How to Decrease Image Brightness in CSS

You can use css filters, below and example for web-kit. please look at this example: http://jsfiddle.net/m9sjdbx6/4/

    img { -webkit-filter: brightness(0.2);}

How to solve ADB device unauthorized in Android ADB host device?

Have you tried

adb kill-server
adb shell

Sometimes adb gets stuck and first killing adb server and then starting some command forces authorization window to pop-up.

Also please check adb client version on your phone. THis feature is supported from adb 1.0.31 as far as I remember.

Html.DropDownList - Disabled/Readonly

A tip that may be obvious to some but not others..

If you're using the HTML Helper based on DropDownListFor then your ID will be duplicated in the HiddenFor input. Therefore, you'll have duplicate IDs which is invalid in HTML and if you're using javascript to populate the HiddenFor and DropDownList then you'll have a problem.

The solution is to manually set the ID property in the htmlattributes array...

@Html.HiddenFor(model => model.Entity)

@Html.EnumDropDownListFor(
  model => model.Entity, 
  new { 
         @class = "form-control sharp", 
         onchange = "", 
         id =` "EntityDD", 
         disabled = "disabled" 
       }
)

How to solve java.lang.NullPointerException error?

A NullPointerException means that one of the variables you are passing is null, but the code tries to use it like it is not.

For example, If I do this:

Integer myInteger = null;
int n = myInteger.intValue();

The code tries to grab the intValue of myInteger, but since it is null, it does not have one: a null pointer exception happens.

What this means is that your getTask method is expecting something that is not a null, but you are passing a null. Figure out what getTask needs and pass what it wants!

How to use C++ in Go

As of go1.2+, cgo automatically incorporates and compiles C++ code:

http://golang.org/doc/go1.2#cgo_and_cpp

What is the difference between char, nchar, varchar, and nvarchar in SQL Server?

nchar requires more space than nvarchar.

eg,

A nchar(100) will always store 100 characters even if you only enter 5, the remaining 95 chars will be padded with spaces. Storing 5 characters in a nvarchar(100) will save 5 characters.

Escape double quote in grep

The problem is that you aren't correctly escaping the input string, try:

echo "\"member\":\"time\"" | grep -e "member\""

Alternatively, you can use unescaped double quotes within single quotes:

echo '"member":"time"' | grep -e 'member"'

It's a matter of preference which you find clearer, although the second approach prevents you from nesting your command within another set of single quotes (e.g. ssh 'cmd').

TypeError: document.getElementbyId is not a function

Case sensitive: document.getElementById (notice the capital B).

Where is Python language used?

With a few exceptions, Python is used pretty much wherever a programmer who knows Python wants to focus on solving a problem instead of struggling with implementation details. You'll find it in games, web applications, network servers, scientific computing, media tools, application scripting, etc. (There's a somewhat old list of some organizations that use it here.) People who know it well tend to love it because it strikes a very rare balance of conciseness and clarity, and (perhaps to a lesser extent) because it has a rich set of useful libraries.

Some places where Python isn't used as much:

  • Web browser scripts (because browsers implement JavaScript, not Python, though there are ways around that)
  • Large GUI applications (perhaps because good GUI bindings are relatively new)
  • Graphics engines (for performance reasons, but note that Python is sometimes used for the controlling logic that makes use of a graphics engine)
  • Small embedded devices (although some folks have had success with compact, stripped-down and special-purpose implementations of Python, and we're starting to see python tools for building applications on smart phones and tablets.)

Sort an Array by keys based on another Array?
  • sort as requested
  • save for int-keys (because of array_replace)
  • don't return keys are not existing in inputArray
  • (optionally) filter keys no existing in given keyList

Code:

 /**
 * sort keys like in key list
 * filter: remove keys are not listed in keyList
 * ['c'=>'red', 'd'=>'2016-12-29'] = sortAndFilterKeys(['d'=>'2016-12-29', 'c'=>'red', 'a'=>3 ]], ['c', 'd', 'z']){
 *
 * @param array $inputArray
 * @param string[]|int[] $keyList
 * @param bool $removeUnknownKeys
 * @return array
 */
static public function sortAndFilterKeys($inputArray, $keyList, $removeUnknownKeys=true){
    $keysAsKeys = array_flip($keyList);
    $result = array_replace($keysAsKeys, $inputArray); // result = sorted keys + values from input + 
    $result = array_intersect_key($result, $inputArray); // remove keys are not existing in inputArray 
    if( $removeUnknownKeys ){
        $result = array_intersect_key($result, $keysAsKeys); // remove keys are not existing in keyList 
    }
    return $result;
}

Stop all active ajax requests in jQuery

I had some problems with andy's code, but it gave me some great ideas. First problem was that we should pop off any jqXHR objects that successfully complete. I also had to modify the abortAll function. Here is my final working code:

$.xhrPool = [];
$.xhrPool.abortAll = function() {
            $(this).each(function(idx, jqXHR) {
                        jqXHR.abort();
                        });
};
$.ajaxSetup({
    beforeSend: function(jqXHR) {
            $.xhrPool.push(jqXHR);
            }
});
$(document).ajaxComplete(function() {
            $.xhrPool.pop();
            });

I didn't like the ajaxComplete() way of doing things. No matter how I tried to configure .ajaxSetup it did not work.

CustomErrors mode="Off"

If you're still getting that page, it's likely that it's blowing up before getting past the Web.Config

Make sure that ASP.Net has permissions it needs to things like the .Net Framework folders, the IIS Metabase, etc. Do you have any way of checking that ASP.Net is installed correctly and associated in IIS correctly?

Edit: After Greg's comment it occured to me I assumed that what you posted was your entire very minimal web.config, is there more to it? If so can you post the entire web.config?

Add horizontal scrollbar to html table

 
//Representation of table
<div class="search-table-outter">
<table class="table table-responsive search-table inner">
</table>
</div>

//Css to make Horizontal Dropdown

<style>

    .search-table{table-layout: auto; margin:40px auto 0px auto; }
    .search-table, td, th {
        border-collapse: collapse;
    }
th{padding:20px 7px; font-size:15px; color:#444;}
td{padding:5px 10px; height:35px;}
    .search-table-outter { overflow-x: scroll; }
th, td { min-width: 200px; }


</style>

How to set background image in Java?

Firstly create a new class that extends the WorldView class. I called my new class Background. So in this new class import all the Java packages you will need in order to override the paintBackground method. This should be:

import city.soi.platform.*;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.ImageObserver;
import javax.swing.ImageIcon;
import java.awt.geom.AffineTransform;

Next after the class name make sure that it says extends WorldView. Something like this:

public class Background extends WorldView

Then declare the variables game of type Game and an image variable of type Image something like this:

private Game game;
private Image image;

Then in the constructor of this class make sure the game of type Game is in the signature of the constructor and that in the call to super you will have to initialise the WorldView, initialise the game and initialise the image variables, something like this:

super(game.getCurrentLevel().getWorld(), game.getWidth(), game.getHeight());
this.game = game;
bg = (new ImageIcon("lol.png")).getImage();

Then you just override the paintBackground method in exactly the same way as you did when overriding the paint method in the Player class. Just like this:

public void paintBackground(Graphics2D g)
{
float x = getX();
float y = getY();
AffineTransform transform = AffineTransform.getTranslateInstance(x,y);
g.drawImage(bg, transform, game.getView());
}

Now finally you have to declare a class level reference to the new class you just made in the Game class and initialise this in the Game constructor, something like this:

private Background image;

And in the Game constructor:
image = new Background(this);

Lastly all you have to do is add the background to the frame! That's the thing I'm sure we were all missing. To do that you have to do something like this after the variable frame has been declared:

frame.add(image);

Make sure you add this code just before frame.pack();. Also make sure you use a background image that isn't too big!

Now that's it! Ive noticed that the game engines can handle JPEG and PNG image formats but could also support others. Even though this helps include a background image in your game, it is not perfect! Because once you go to the next level all your platforms and sprites are invisible and all you can see is your background image and any JLabels/Jbuttons you have included in the game.

How to write LDAP query to test if user is member of a group?

I would add one more thing to Marc's answer: The memberOf attribute can't contain wildcards, so you can't say something like "memberof=CN=SPS*", and expect it to find all groups that start with "SPS".

How to show validation message below each textbox using jquery?

You could put static elements after the fields and show them, or you could inject the validation message dynamically. See the below example for how to inject dynamically.

This example also follows the best practice of setting focus to the blank field so user can easily correct the issue.

Note that you could easily genericize this to work with any label & field (for required fields anyway), instead of my example which specifically codes each validation.

Your fiddle is updated, see here: jsfiddle

The code:

$('form').on('submit', function (e) {
    var focusSet = false;
    if (!$('#email').val()) {
        if ($("#email").parent().next(".validation").length == 0) // only add if not added
        {
            $("#email").parent().after("<div class='validation' style='color:red;margin-bottom: 20px;'>Please enter email address</div>");
        }
        e.preventDefault(); // prevent form from POST to server
        $('#email').focus();
        focusSet = true;
    } else {
        $("#email").parent().next(".validation").remove(); // remove it
    }
    if (!$('#password').val()) {
        if ($("#password").parent().next(".validation").length == 0) // only add if not added
        {
            $("#password").parent().after("<div class='validation' style='color:red;margin-bottom: 20px;'>Please enter password</div>");
        }
        e.preventDefault(); // prevent form from POST to server
        if (!focusSet) {
            $("#password").focus();
        }
    } else {
        $("#password").parent().next(".validation").remove(); // remove it
    }
});

The CSS:

    .validation
    {
      color: red;
      margin-bottom: 20px;
    }

How to remove text from a string?

Performance

Today 2021.01.14 I perform tests on MacOs HighSierra 10.13.6 on Chrome v87, Safari v13.1.2 and Firefox v84 for chosen solutions.

Results

For all browsers

  • solutions Ba, Cb, and Db are fast/fastest for long strings
  • solutions Ca, Da are fast/fastest for short strings
  • solutions Ab and E are slow for long strings
  • solutions Ba, Bb and F are slow for short strings

enter image description here

Details

I perform 2 tests cases:

  • short string - 10 chars - you can run it HERE
  • long string - 1 000 000 chars - you can run it HERE

Below snippet presents solutions Aa Ab Ba Bb Ca Cb Da Db E F

_x000D_
_x000D_ 
// https://stackoverflow.com/questions/10398931/how-to-strToRemove-text-from-a-string

// https://stackoverflow.com/a/10398941/860099
function Aa(str,strToRemove) {
  return str.replace(strToRemove,'');
}

// https://stackoverflow.com/a/63362111/860099
function Ab(str,strToRemove) {
  return str.replaceAll(strToRemove,'');
}

// https://stackoverflow.com/a/23539019/860099
function Ba(str,strToRemove) {
  let re = strToRemove.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // regexp escape char
  return str.replace(new RegExp(re),'');
}

// https://stackoverflow.com/a/63362111/860099
function Bb(str,strToRemove) {
  let re = strToRemove.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // regexp escape char
  return str.replaceAll(new RegExp(re,'g'),'');
}

// https://stackoverflow.com/a/27098801/860099
function Ca(str,strToRemove) {
  let start = str.indexOf(strToRemove);
  return str.slice(0,start) + str.slice(start+strToRemove.length, str.length);
}

// https://stackoverflow.com/a/27098801/860099
function Cb(str,strToRemove) {
  let start = str.search(strToRemove);
  return str.slice(0,start) + str.slice(start+strToRemove.length, str.length);
}

// https://stackoverflow.com/a/23181792/860099
function Da(str,strToRemove) {
  let start = str.indexOf(strToRemove);
  return str.substr(0, start) + str.substr(start + strToRemove.length);
}

// https://stackoverflow.com/a/23181792/860099
function Db(str,strToRemove) {
  let start = str.search(strToRemove);
  return str.substr(0, start) + str.substr(start + strToRemove.length);
}

// https://stackoverflow.com/a/49857431/860099
function E(str,strToRemove) {
  return str.split(strToRemove).join('');
}

// https://stackoverflow.com/a/45406624/860099
function F(str,strToRemove) {
    var n = str.search(strToRemove);
    while (str.search(strToRemove) > -1) {
        n = str.search(strToRemove);
        str = str.substring(0, n) + str.substring(n + strToRemove.length, str.length);
    }
    return str;
}


let str = "data-123";
let strToRemove = "data-";

[Aa,Ab,Ba,Bb,Ca,Cb,Da,Db,E,F].map( f=> console.log(`${f.name.padEnd(2,' ')} ${f(str,strToRemove)}`));
_x000D_ 
This shippet only presents functions used in performance tests - it not perform tests itself!
_x000D_
_x000D_
_x000D_

And here are example results for chrome

enter image description here

Find column whose name contains a specific string

Getting name and subsetting based on Start, Contains, and Ends:

# from: https://stackoverflow.com/questions/21285380/find-column-whose-name-contains-a-specific-string
# from: https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.str.contains.html
# from: https://cmdlinetips.com/2019/04/how-to-select-columns-using-prefix-suffix-of-column-names-in-pandas/
# from: https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.filter.html




import pandas as pd



data = {'spike_starts': [1,2,3], 'ends_spike_starts': [4,5,6], 'ends_spike': [7,8,9], 'not': [10,11,12]}
df = pd.DataFrame(data)



print("\n")
print("----------------------------------------")
colNames_contains = df.columns[df.columns.str.contains(pat = 'spike')].tolist() 
print("Contains")
print(colNames_contains)



print("\n")
print("----------------------------------------")
colNames_starts = df.columns[df.columns.str.contains(pat = '^spike')].tolist() 
print("Starts")
print(colNames_starts)



print("\n")
print("----------------------------------------")
colNames_ends = df.columns[df.columns.str.contains(pat = 'spike$')].tolist() 
print("Ends")
print(colNames_ends)



print("\n")
print("----------------------------------------")
df_subset_start = df.filter(regex='^spike',axis=1)
print("Starts")
print(df_subset_start)



print("\n")
print("----------------------------------------")
df_subset_contains = df.filter(regex='spike',axis=1)
print("Contains")
print(df_subset_contains)



print("\n")
print("----------------------------------------")
df_subset_ends = df.filter(regex='spike$',axis=1)
print("Ends")
print(df_subset_ends)

How to transfer some data to another Fragment?

From Activity Class:

Send the data using bundle arguments to the fragment and load the fragment

   Fragment fragment = new myFragment();
   Bundle bundle = new Bundle();
   bundle.putString("pName", personName);
   bundle.putString("pEmail", personEmail);
   bundle.putString("pId", personId);
   fragment.setArguments(bundle);

   getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
                    fragment).commit();

From myFragment Class:

Get the arguments from the bundle and set them to xml

    Bundle arguments = getArguments();
    String personName = arguments.getString("pName");
    String personEmail = arguments.getString("pEmail");
    String personId = arguments.getString("pId");

    nameTV = v.findViewById(R.id.name);
    emailTV = v.findViewById(R.id.email);
    idTV = v.findViewById(R.id.id);

    nameTV.setText("Name: "+ personName);
    emailTV.setText("Email: "+ personEmail);
    idTV.setText("ID: "+ personId);

WooCommerce return product object by id

Another easy way is to use the WC_Product_Factory class and then call function get_product(ID)

http://docs.woothemes.com/wc-apidocs/source-class-WC_Product_Factory.html#16-63

sample:

// assuming the list of product IDs is are stored in an array called IDs;
$_pf = new WC_Product_Factory();  
foreach ($IDs as $id) {

    $_product = $_pf->get_product($id);

    // from here $_product will be a fully functional WC Product object, 
    // you can use all functions as listed in their api
}

You can then use all the function calls as listed in their api: http://docs.woothemes.com/wc-apidocs/class-WC_Product.html

I cannot access tomcat admin console?

For me, it just was that service console restart didn't work after tomcat ran into an error. Only stop/start brought it back.

'const string' vs. 'static readonly string' in C#

You can change the value of a static readonly string only in the static constructor of the class or a variable initializer, whereas you cannot change the value of a const string anywhere.

How do I move an existing Git submodule within a Git repository?

In my case, I wanted to move a submodule from one directory into a subdirectory, e.g. "AFNetworking" -> "ext/AFNetworking". These are the steps I followed:

  1. Edit .gitmodules changing submodule name and path to be "ext/AFNetworking"
  2. Move submodule's git directory from ".git/modules/AFNetworking" to ".git/modules/ext/AFNetworking"
  3. Move library from "AFNetworking" to "ext/AFNetworking"
  4. Edit ".git/modules/ext/AFNetworking/config" and fix the [core] worktree line. Mine changed from ../../../AFNetworking to ../../../../ext/AFNetworking
  5. Edit "ext/AFNetworking/.git" and fix gitdir. Mine changed from ../.git/modules/AFNetworking to ../../git/modules/ext/AFNetworking
  6. git add .gitmodules
  7. git rm --cached AFNetworking
  8. git submodule add -f <url> ext/AFNetworking

Finally, I saw in the git status:

matt$ git status
# On branch ios-master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#   modified:   .gitmodules
#   renamed:    AFNetworking -> ext/AFNetworking

Et voila. The above example doesn't change the directory depth, which makes a big difference to the complexity of the task, and doesn't change the name of the submodule (which may not really be necessary, but I did it to be consistent with what would happen if I added a new module at that path.)

How to exclude 0 from MIN formula Excel

Not entirely sure what you want here, but if you want to discount blank cells in the range and pass over zeros then this would do it; if a little contrived:

=MIN(IF(A1:E1=0,MAX(A1:E1),A1:E1))

With Ctrl+Shift+Enter as an array.

What I'm doing here is replacing zeros with the maximum value in the list.

FromBody string parameter is giving null

You are on the right track.

On your header set

Content-Type: application/x-www-form-urlencoded

The body of the POST request should be =test and nothing else. For unknown/variable strings you have to URL encode the value so that way you do not accidentally escape with an input character.

See also POST string to ASP.NET Web Api application - returns null

How to get parameter on Angular2 route in Angular way?

As of Angular 6+, this is handled slightly differently than in previous versions. As @BeetleJuice mentions in the answer above, paramMap is new interface for getting route params, but the execution is a bit different in more recent versions of Angular. Assuming this is in a component:

private _entityId: number;

constructor(private _route: ActivatedRoute) {
    // ...
}

ngOnInit() {
    // For a static snapshot of the route...
    this._entityId = this._route.snapshot.paramMap.get('id');

    // For subscribing to the observable paramMap...
    this._route.paramMap.pipe(
        switchMap((params: ParamMap) => this._entityId = params.get('id'))
    );

    // Or as an alternative, with slightly different execution...
    this._route.paramMap.subscribe((params: ParamMap) =>  {
        this._entityId = params.get('id');
    });
}

I prefer to use both because then on direct page load I can get the ID param, and also if navigating between related entities the subscription will update properly.

Source in Angular Docs

Convert String to Uri

If you are using Kotlin and Kotlin android extensions, then there is a beautiful way of doing this.

val uri = myUriString.toUri()

To add Kotlin extensions (KTX) to your project add the following to your app module's build.gradle

  repositories {
    google()
}

dependencies {
    implementation 'androidx.core:core-ktx:1.0.0-rc01'
}

Get value of a string after last slash in JavaScript

Jquery:

var afterDot = value.substr(value.lastIndexOf('_') + 1);

Javascript:

var myString = 'asd/f/df/xc/asd/test.jpg'
var parts    = myString.split('/');
var answer   = parts[parts.length - 1];
console.log(answer);

Replace '_' || '/' to your own need

How to check if a specified key exists in a given S3 bucket using Java

This java code checks if the key (file) exists in s3 bucket.

public static boolean isExistS3(String accessKey, String secretKey, String bucketName, String file) {

    // Amazon-s3 credentials
    AWSCredentials myCredentials = new BasicAWSCredentials(accessKey, secretKey); 
    AmazonS3Client s3Client = new AmazonS3Client(myCredentials); 

    ObjectListing objects = s3Client.listObjects(new ListObjectsRequest().withBucketName(bucketName).withPrefix(file));

    for (S3ObjectSummary objectSummary: objects.getObjectSummaries()) {
        if (objectSummary.getKey().equals(file)) {
            return true;
        }
    }
    return false;
}

Can a relative sitemap url be used in a robots.txt?

Google crawlers are not smart enough, they can't crawl relative URLs, that's why it's always recommended to use absolute URL's for better crawlability and indexability.

Therefore, you can not use this variation

> sitemap: /sitemap.xml

Recommended syntax is

Sitemap: https://www.yourdomain.com/sitemap.xml

Note:

  • Don't forgot to capitalise the first letter in "sitemap"
  • Don't forgot to put space after "Sitemap:"

Extracting an attribute value with beautifulsoup

I am using this with Beautifulsoup 4.8.1 to get the value of all class attributes of certain elements:

from bs4 import BeautifulSoup

html = "<td class='val1'/><td col='1'/><td class='val2' />"

bsoup = BeautifulSoup(html, 'html.parser')

for td in bsoup.find_all('td'):
    if td.has_attr('class'):
        print(td['class'][0])

Its important to note that the attribute key retrieves a list even when the attribute has only a single value.

how to select rows based on distinct values of A COLUMN only

I am not sure about your DBMS. So, I created a temporary table in Redshift and from my experience, I think this query should return what you are looking for:

select min(Id), distinct MailId, EmailAddress, Name
    from yourTableName
    group by MailId, EmailAddress, Name

I see that I am using a GROUP BY clause but you still won't have two rows against any particular MailId.

How can I open a Shell inside a Vim Window?

I am currently using tmux.

Installation: sudo apt-get install tmux Run it: tmux

Ctrl + b followed by Ctr + % : it splits your terminal window in two vertical halves.

Ctrl + "arrow left | arrow right" : moves between terminals.

DynamoDB vs MongoDB NoSQL

With 500k documents, there is no reason to scale whatsoever. A typical laptop with an SSD and 8GB of ram can easily do 10s of millions of records, so if you are trying to pick because of scaling your choice doesn't really matter. I would suggest you pick what you like the most, and perhaps where you can find the most online support with.

How to update Pandas from Anaconda and is it possible to use eclipse with this last

Simply type conda update pandas in your preferred shell (on Windows, use cmd; if Anaconda is not added to your PATH use the Anaconda prompt). You can of course use Eclipse together with Anaconda, but you need to specify the Python-Path (the one in the Anaconda-Directory). See this document for a detailed instruction.

Assign a class name to <img> tag instead of write it in css file?

It's just more versatile if you give it a class name as the style you specify will only apply to that class name. But if you exactly know every .column img and want to style that in the same way, there's no reason why you can't use that selector.

The performance difference, if any, is negligible these days.

Python logging: use milliseconds in time format

The simplest way I found was to override default_msec_format:

formatter = logging.Formatter('%(asctime)s')
formatter.default_msec_format = '%s.%03d'

HTML table with fixed headers and a fixed column?

Working example of link posted by pranav:

http://jsbin.com/nolanole/1/edit?html,js,output

FYI: Tested in IE 6, 7, & 8 (compatibility mode on or off), FF 3 & 3.5, Chrome 2. Not screen-reader-friendly (headers aren't part of content table).

EDIT 5/5/14: moved example to jsBin. This is old, but amazingly still works in current Chrome, IE, and Firefox (though IE and Firefox might require some adjustments to row heights).

get url content PHP

Use cURL,

Check if you have it via phpinfo();

And for the code:

function getHtml($url, $post = null) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
    if(!empty($post)) {
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    } 
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

Why does multiplication repeats the number several times?

It's the difference between strings and integers. See:

>>> "1" * 9
'111111111'

>>> 1 * 9
9

How to stop/cancel 'git log' command in terminal?

You can hit the key q (for quit) and it should take you to the prompt.

Please see this link.

"OverflowError: Python int too large to convert to C long" on windows but not mac

You'll get that error once your numbers are greater than sys.maxsize:

>>> p = [sys.maxsize]
>>> preds[0] = p
>>> p = [sys.maxsize+1]
>>> preds[0] = p
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OverflowError: Python int too large to convert to C long

You can confirm this by checking:

>>> import sys
>>> sys.maxsize
2147483647

To take numbers with larger precision, don't pass an int type which uses a bounded C integer behind the scenes. Use the default float:

>>> preds = np.zeros((1, 3))

The HTTP request is unauthorized with client authentication scheme 'Ntlm' The authentication header received from the server was 'NTLM'

I had exactly the same issue last week - WCF program behaves strangely on one server - why?

For me the solution was rather simple. Sharepoint has its own set of permissions. My client tried to log on as a user that wasn't explicitly given access to the webservice through Sharepoint's administration panel.

I added the user to Sharepoint's whitelist and bang - it just worked.

Even if that isn't the issue, please note that

The HTTP request is unauthorized with client authentication scheme ‘Ntlm’. The authentication header received from the server was ‘NTLM’.

Means (in English) that you simply don't have permission. Your protocol is probably right - your user just doesn't have permissions.

dropping infinite values from dataframes in pandas?

The above solution will modify the infs that are not in the target columns. To remedy that,

lst = [np.inf, -np.inf]
to_replace = {v: lst for v in ['col1', 'col2']}
df.replace(to_replace, np.nan)

How can I mock an ES6 module import using Jest?

The question is already answered, but you can resolve it like this:

File dependency.js

const doSomething = (x) => x
export default doSomething;

File myModule.js

import doSomething from "./dependency";

export default (x) => doSomething(x * 2);

File myModule.spec.js

jest.mock('../dependency');
import doSomething from "../dependency";
import myModule from "../myModule";

describe('myModule', () => {
  it('calls the dependency with double the input', () => {
    doSomething.mockImplementation((x) => x * 10)

    myModule(2);

    expect(doSomething).toHaveBeenCalledWith(4);
    console.log(myModule(2)) // 40
  });
});

Spring Boot - How to log all requests and responses with exceptions in single place?

Here is how I do it in spring data rest by using org.springframework.web.util.ContentCachingRequestWrapper and org.springframework.web.util.ContentCachingResponseWrapper

/**
 * Doogies very cool HTTP request logging
 *
 * There is also {@link org.springframework.web.filter.CommonsRequestLoggingFilter}  but it cannot log request method
 * And it cannot easily be extended.
 *
 * https://mdeinum.wordpress.com/2015/07/01/spring-framework-hidden-gems/
 * http://stackoverflow.com/questions/8933054/how-to-read-and-copy-the-http-servlet-response-output-stream-content-for-logging
 */
public class DoogiesRequestLogger extends OncePerRequestFilter {

  private boolean includeResponsePayload = true;
  private int maxPayloadLength = 1000;

  private String getContentAsString(byte[] buf, int maxLength, String charsetName) {
    if (buf == null || buf.length == 0) return "";
    int length = Math.min(buf.length, this.maxPayloadLength);
    try {
      return new String(buf, 0, length, charsetName);
    } catch (UnsupportedEncodingException ex) {
      return "Unsupported Encoding";
    }
  }

  /**
   * Log each request and respponse with full Request URI, content payload and duration of the request in ms.
   * @param request the request
   * @param response the response
   * @param filterChain chain of filters
   * @throws ServletException
   * @throws IOException
   */
  @Override
  protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {

    long startTime = System.currentTimeMillis();
    StringBuffer reqInfo = new StringBuffer()
     .append("[")
     .append(startTime % 10000)  // request ID
     .append("] ")
     .append(request.getMethod())
     .append(" ")
     .append(request.getRequestURL());

    String queryString = request.getQueryString();
    if (queryString != null) {
      reqInfo.append("?").append(queryString);
    }

    if (request.getAuthType() != null) {
      reqInfo.append(", authType=")
        .append(request.getAuthType());
    }
    if (request.getUserPrincipal() != null) {
      reqInfo.append(", principalName=")
        .append(request.getUserPrincipal().getName());
    }

    this.logger.debug("=> " + reqInfo);

    // ========= Log request and response payload ("body") ========
    // We CANNOT simply read the request payload here, because then the InputStream would be consumed and cannot be read again by the actual processing/server.
    //    String reqBody = DoogiesUtil._stream2String(request.getInputStream());   // THIS WOULD NOT WORK!
    // So we need to apply some stronger magic here :-)
    ContentCachingRequestWrapper wrappedRequest = new ContentCachingRequestWrapper(request);
    ContentCachingResponseWrapper wrappedResponse = new ContentCachingResponseWrapper(response);

    filterChain.doFilter(wrappedRequest, wrappedResponse);     // ======== This performs the actual request!
    long duration = System.currentTimeMillis() - startTime;

    // I can only log the request's body AFTER the request has been made and ContentCachingRequestWrapper did its work.
    String requestBody = this.getContentAsString(wrappedRequest.getContentAsByteArray(), this.maxPayloadLength, request.getCharacterEncoding());
    if (requestBody.length() > 0) {
      this.logger.debug("   Request body:\n" +requestBody);
    }

    this.logger.debug("<= " + reqInfo + ": returned status=" + response.getStatus() + " in "+duration + "ms");
    if (includeResponsePayload) {
      byte[] buf = wrappedResponse.getContentAsByteArray();
      this.logger.debug("   Response body:\n"+getContentAsString(buf, this.maxPayloadLength, response.getCharacterEncoding()));
    }

    wrappedResponse.copyBodyToResponse();  // IMPORTANT: copy content of response back into original response

  }


}

Visual Studio Code - Target of URI doesn't exist 'package:flutter/material.dart'

Basically

  1. Check for correct indentation of your package in dependencies
  2. if your editor supports, it automatically runs -> flutter pub get
  3. Either way -> open terminal-> flutter pub get or flutter packages get
  4. check .packages file, see if your package is present else reinstall package
  5. Most important : Restart your IDE (Visual studio or Android Studio)

Start debugging your project

Most probably , your errors will be fixed by then

Hope it works for you

How to center a navigation bar with CSS or HTML?

 
#nav ul {
    display: inline-block;
    list-style-type: none;
}

It should work, I tested it in your site.

enter image description here

python: create list of tuples from lists

You're looking for the zip builtin function. From the docs:

>>> x = [1, 2, 3]
>>> y = [4, 5, 6]
>>> zipped = zip(x, y)
>>> zipped
[(1, 4), (2, 5), (3, 6)]

Including a groovy script in another groovy

As of Groovy 2.2 it is possible to declare a base script class with the new @BaseScript AST transform annotation.

Example:

file MainScript.groovy:

abstract class MainScript extends Script {
    def meaningOfLife = 42
}

file test.groovy:

import groovy.transform.BaseScript
@BaseScript MainScript mainScript

println "$meaningOfLife" //works as expected

JUnit 5: How to assert an exception is thrown?

I think this is an even simpler example

List<String> emptyList = new ArrayList<>();
Optional<String> opt2 = emptyList.stream().findFirst();
assertThrows(NoSuchElementException.class, () -> opt2.get());

Calling get() on an optional containing an empty ArrayList will throw a NoSuchElementException. assertThrows declares the expected exception and provides a lambda supplier (takes no arguments and returns a value).

Thanks to @prime for his answer which I hopefully elaborated on.

How to load Spring Application Context

Add this at the start of main

ApplicationContext context = new ClassPathXmlApplicationContext("path/to/applicationContext.xml");

JobLauncher launcher=(JobLauncher)context.getBean("launcher");
Job job=(Job)context.getBean("job");

//Get as many beans you want
//Now do the thing you were doing inside test method
StopWatch sw = new StopWatch();
sw.start();
launcher.run(job, jobParameters);
sw.stop();
//initialize the log same way inside main
logger.info(">>> TIME ELAPSED:" + sw.prettyPrint());

using where and inner join in mysql

Try this:

SELECT Locations.Name, Schools.Name
FROM Locations
INNER JOIN School_Locations ON School_Locations.Locations_Id = Locations.Id
INNER JOIN Schools ON School.Id = Schools_Locations.School_Id
WHERE Locations.Type = "coun"

You can join Locations to School_Locations and then School_Locations to School. This forms a set of all related Locations and Schools, which you can then widdle down using the WHERE clause to those whose Location is of type "coun."

Detect a finger swipe through JavaScript on the iPhone and Android

I merged a few of the answers here into a script that uses CustomEvent to fire swiped events in the DOM. Add the 0.7k swiped-events.min.js script to your page and listen for swiped events:

swiped

document.addEventListener('swiped', function(e) {
    console.log(e.target); // the element that was swiped
    console.log(e.detail.dir); // swiped direction
});

swiped-left

document.addEventListener('swiped-left', function(e) {
    console.log(e.target); // the element that was swiped
});

swiped-right

document.addEventListener('swiped-right', function(e) {
    console.log(e.target); // the element that was swiped
});

swiped-up

document.addEventListener('swiped-up', function(e) {
    console.log(e.target); // the element that was swiped
});

swiped-down

document.addEventListener('swiped-down', function(e) {
    console.log(e.target); // the element that was swiped
});

You can also attach directly to an element:

document.getElementById('myBox').addEventListener('swiped-down', function(e) {
    console.log(e.target); // the element that was swiped
});

Optional config

You can specify the following attributes to tweak how swipe interaction functions in your page (these are optional).

<div data-swipe-threshold="10"
     data-swipe-timeout="1000"
     data-swipe-ignore="false">
      Swiper, get swiping!
</div>

To set defaults application wide, set config attributes on topmost element:

<body data-swipe-threshold="100" data-swipe-timeout="250">
    <div>Swipe me</div>
    <div>or me</div>
</body>

Source code is available on Github

What does $ mean before a string?

the $ sign in the string is for definition of interpolation string that is a feature in C# to interpolate the string is a "true string" that might contain interpolated expressions

for further information this is the source of the answer and example: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated

How to remove an element slowly with jQuery?

If you need to hide and then remove the element use the remove method inside the callback function of hide method.

This should work

$target.hide("slow", function(){ $(this).remove(); })

Efficient way to Handle ResultSet in Java

A couple of things to enhance the other answers. First, you should never return a HashMap, which is a specific implementation. Return instead a plain old java.util.Map. But that's actually not right for this example, anyway. Your code only returns the last row of the ResultSet as a (Hash)Map. You instead want to return a List<Map<String,Object>>. Think about how you should modify your code to do that. (Or you could take Dave Newton's suggestion).

Dependency Walker reports IESHIMS.DLL and WER.DLL missing?

ieshims.dll is an artefact of Vista/7 where a shim DLL is used to proxy certain calls (such as CreateProcess) to handle protected mode IE, which doesn't exist on XP, so it is unnecessary. wer.dll is related to Windows Error Reporting and again is probably unused on Windows XP which has a slightly different error reporting system than Vista and above.

I would say you shouldn't need either of them to be present on XP and would normally be delay loaded anyway.

Angular 4 - Observable catch error

With angular 6 and rxjs 6 Observable.throw(), Observable.off() has been deprecated instead you need to use throwError

ex : 

return this.http.get('yoururl')
  .pipe(
    map(response => response.json()),
    catchError((e: any) =>{
      //do your processing here
      return throwError(e);
    }),
  );

DateDiff to output hours and minutes

In case someone is still searching for a query to display the difference in hr min and sec format: (This will display the difference in this format: 2 hr 20 min 22 secs)

SELECT
CAST(DATEDIFF(minute, StartDateTime, EndDateTime)/ 60 as nvarchar(20)) + ' hrs ' + CAST(DATEDIFF(second, StartDateTime, EndDateTime)/60 as nvarchar(20)) + ' mins' +          CAST(DATEDIFF(second, StartDateTime, EndDateTime)% 60 as nvarchar(20))  + ' secs'

OR can be in the format as in the question:

CAST(DATEDIFF(minute, StartDateTime, EndDateTime)/ 60 as nvarchar(20)) + ':' + CAST(DATEDIFF(second, StartDateTime, EndDateTime)/60 as nvarchar(20))

How to delete a row from GridView?

hi how to delete from datagridview

1.make query delete by id
2.type 

tabletableadaptor.delete
query(datagridwiewX1.selectedrows[0].cell[0].value.tostring);

Python Dictionary Comprehension

 
>>> {i:i for i in range(1, 11)}
{1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 10: 10}

Customizing Bootstrap CSS template

Use LESS with Bootstrap...

Here are the Bootstrap docs for how to use LESS

(they have moved since previous answers)

How to create unit tests easily in eclipse

Check out this discussion [How to automatically generate junits?]

If you are starting new and its a java application then Spring ROO looks very interesting too!

Hope that helps.

Break promise chain and call a function based on the step in the chain where it is broken (rejected)

When rejecting you should pass an rejection error, then wrap step error handlers in a function that checks whether the rejection should be processed or "rethrown" until the end of the chain :

// function mocking steps
function step(i) {
    i++;
    console.log('step', i);
    return q.resolve(i);
}

// function mocking a failing step
function failingStep(i) {
    i++;
    console.log('step '+ i + ' (will fail)');
    var e = new Error('Failed on step ' + i);
    e.step = i;
    return q.reject(e);
}

// error handler
function handleError(e){
    if (error.breakChain) {
        // handleError has already been called on this error
        // (see code bellow)
        log('errorHandler: skip handling');
        return q.reject(error);
    }
    // firs time this error is past to the handler
    console.error('errorHandler: caught error ' + error.message);
    // process the error 
    // ...
    //
    error.breakChain = true;
    return q.reject(error);
}

// run the steps, will fail on step 4
// and not run step 5 and 6
// note that handleError of step 5 will be called
// but since we use that error.breakChain boolean
// no processing will happen and the error will
// continue through the rejection path until done(,)

  step(0) // 1
  .catch(handleError)
  .then(step) // 2
  .catch(handleError)
  .then(step) // 3
  .catch(handleError)
  .then(failingStep)  // 4 fail
  .catch(handleError)
  .then(step) // 5
  .catch(handleError)
  .then(step) // 6
  .catch(handleError)
  .done(function(){
      log('success arguments', arguments);
  }, function (error) {
      log('Done, chain broke at step ' + error.step);
  });

What you'd see on the console :

step 1
step 2
step 3
step 4 (will fail)
errorHandler: caught error 'Failed on step 4'
errorHandler: skip handling
errorHandler: skip handling
Done, chain broke at step 4

Here is some working code https://jsfiddle.net/8hzg5s7m/3/

If you have specific handling for each step, your wrapper could be something like:

/*
 * simple wrapper to check if rejection
 * has already been handled
 * @param function real error handler
 */
function createHandler(realHandler) {
    return function(error) {
        if (error.breakChain) {
            return q.reject(error);
        }
        realHandler(error);
        error.breakChain = true;
        return q.reject(error);    
    }
}

then your chain

step1()
.catch(createHandler(handleError1Fn))
.then(step2)
.catch(createHandler(handleError2Fn))
.then(step3)
.catch(createHandler(handleError3Fn))
.done(function(){
    log('success');
}, function (error) {
    log('Done, chain broke at step ' + error.step);
});

How to add background image for input type="button"?

If this is a submit button, use <input type="image" src="..." ... />.

http://www.htmlcodetutorial.com/forms/_INPUT_TYPE_IMAGE.html

If you want to specify the image with CSS, you'll have to use type="submit".

Get sum of MySQL column in PHP

 
$result=mysql_query("SELECT SUM(column) AS total_value FROM table name WHERE column='value'");
$result=mysql_result($result,0,0);

Pandas DataFrame: replace all values in a column, based on condition

You need to select that column:

In [41]:
df.loc[df['First Season'] > 1990, 'First Season'] = 1
df

Out[41]:
                 Team  First Season  Total Games
0      Dallas Cowboys          1960          894
1       Chicago Bears          1920         1357
2   Green Bay Packers          1921         1339
3      Miami Dolphins          1966          792
4    Baltimore Ravens             1          326
5  San Franciso 49ers          1950         1003

So the syntax here is:

df.loc[<mask>(here mask is generating the labels to index) , <optional column(s)> ]

You can check the docs and also the 10 minutes to pandas which shows the semantics

EDIT

If you want to generate a boolean indicator then you can just use the boolean condition to generate a boolean Series and cast the dtype to int this will convert True and False to 1 and 0 respectively:

In [43]:
df['First Season'] = (df['First Season'] > 1990).astype(int)
df

Out[43]:
                 Team  First Season  Total Games
0      Dallas Cowboys             0          894
1       Chicago Bears             0         1357
2   Green Bay Packers             0         1339
3      Miami Dolphins             0          792
4    Baltimore Ravens             1          326
5  San Franciso 49ers             0         1003

How to find whether MySQL is installed in Red Hat?

If you're looking for the RPM.

rpm -qa | grep MySQL

Most of it's data is stored in /var/lib/mysql so that's another good place to look.

If it is installed

which mysql

will give you the location of the binary.

You could also do an

updatedb

and a 

locate mysql

to find any mysql files.

How can I suppress column header output for a single SQL statement?

Invoke mysql with the -N (the alias for -N is --skip-column-names) option:

mysql -N ...
use testdb;
select * from names;

+------+-------+
|    1 | pete  |
|    2 | john  |
|    3 | mike  |
+------+-------+
3 rows in set (0.00 sec)

Credit to ErichBSchulz for pointing out the -N alias.

To remove the grid (the vertical and horizontal lines) around the results use -s (--silent). Columns are separated with a TAB character.

mysql -s ...
use testdb;
select * from names;

id  name
1   pete
2   john
3   mike

To output the data with no headers and no grid just use both -s and -N.

mysql -sN ...

Where is database .bak file saved from SQL Server Management Studio?

As said by Faiyaz, to get default backup location for the instance, you cannot get it into msdb, but you have to look into Registry. You can get it in T-SQL in using xp_instance_regread stored procedure like this:

EXEC  master.dbo.xp_instance_regread 
      N'HKEY_LOCAL_MACHINE', N'SOFTWARE\Microsoft\\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQLServer',N'BackupDirectory'

The double backslash (\\) is because the spaces into that key name part (Microsoft SQL Server). The "MSSQL12.MSSQLSERVER" part is for default instance name for SQL 2014. You have to adapt to put your own instance name (look into Registry).

Iterating through array - java

Using java 8 Stream API could simplify your job.

public static boolean inArray(int[] array, int check) {
    return Stream.of(array).anyMatch(i -> i == check);
}

It's just you have the overhead of creating a new Stream from Array, but this gives exposure to use other Stream API. In your case you may not want to create new method for one-line operation, unless you wish to use this as utility. Hope this helps!

Is quitting an application frowned upon?

This debate boils down to the age-old question of whether the developers know best or whether the user knows best. Professional designers in all areas of human factors struggle with this every day.

Ted has made a point in that one of the most downloaded apps on the Market is the 'App Killer'. People get a bit of extra serotonin when they quit applications. They're used to it with a desktop/laptop. It keeps things moving fast. It keeps the processor cool and the fan from turning on. It uses less power.

When you consider that a mobile device is a much smaller ship, then you can especially appreciate their incentive to 'throw overboard what you no longer need'. Now the developers of Android have reasoned that the OS knows best and that quitting an app is antique. I wholeheartedly support this.

However, I also believe that you should not frustrate the user, even if that frustration is borne out of their own ignorance. Because of that, I conclude that having a 'Quit' option is good design, even if it is mostly a placebo button that does nothing more than close a View.

How can I perform a reverse string search in Excel without using VBA?

Imagine the string could be reversed. Then it is really easy. Instead of working on the string:

"My little cat" (1)

you work with

"tac elttil yM" (2)

With =LEFT(A1;FIND(" ";A1)-1) in A2 you get "My" with (1) and "tac" with (2), which is reversed "cat", the last word in (1).

There are a few VBAs around to reverse a string. I prefer the public VBA function ReverseString.

Install the above as described. Then with your string in A1, e.g., "My little cat" and this function in A2:

=ReverseString(LEFT(ReverseString(A1);IF(ISERROR(FIND(" ";A1));
  LEN(A1);(FIND(" ";ReverseString(A1))-1))))

you'll see "cat" in A2.

The method above assumes that words are separated by blanks. The IF clause is for cells containing single words = no blanks in cell. Note: TRIM and CLEAN the original string are useful as well. In principle it reverses the whole string from A1 and simply finds the first blank in the reversed string which is next to the last (reversed) word (i.e., "tac "). LEFT picks this word and another string reversal reconstitutes the original order of the word (" cat"). The -1 at the end of the FIND statement removes the blank.

The idea is that it is easy to extract the first(!) word in a string with LEFT and FINDing the first blank. However, for the last(!) word the RIGHT function is the wrong choice when you try to do that because unfortunately FIND does not have a flag for the direction you want to analyse your string.

Therefore the whole string is simply reversed. LEFT and FIND work as normal but the extracted string is reversed. But his is no big deal once you know how to reverse a string. The first ReverseString statement in the formula does this job.

Creating and returning Observable from Angular 2 Service

Notice that you're using Observable#map to convert the raw Response object your base Observable emits to a parsed representation of the JSON response.

If I understood you correctly, you want to map again. But this time, converting that raw JSON to instances of your Model. So you would do something like:

http.get('api/people.json')
  .map(res => res.json())
  .map(peopleData => peopleData.map(personData => new Person(personData)))

So, you started with an Observable that emits a Response object, turned that into an observable that emits an object of the parsed JSON of that response, and then turned that into yet another observable that turned that raw JSON into an array of your models.

taking input of a string word by word

Put the line in a stringstream and extract word by word back:

#include <iostream>
#include <sstream>
using namespace std;

int main()
{
    string t;
    getline(cin,t);

    istringstream iss(t);
    string word;
    while(iss >> word) {
        /* do stuff with word */
    }
}

Of course, you can just skip the getline part and read word by word from cin directly.

And here you can read why is using namespace std considered bad practice.

What is best way to start and stop hadoop ecosystem, with command line?

start-all.sh & stop-all.sh : Used to start and stop hadoop daemons all at once. Issuing it on the master machine will start/stop the daemons on all the nodes of a cluster. Deprecated as you have already noticed.

start-dfs.sh, stop-dfs.sh and start-yarn.sh, stop-yarn.sh : Same as above but start/stop HDFS and YARN daemons separately on all the nodes from the master machine. It is advisable to use these commands now over start-all.sh & stop-all.sh

hadoop-daemon.sh namenode/datanode and yarn-deamon.sh resourcemanager : To start individual daemons on an individual machine manually. You need to go to a particular node and issue these commands.

Use case : Suppose you have added a new DN to your cluster and you need to start the DN daemon only on this machine,

bin/hadoop-daemon.sh start datanode

Note : You should have ssh enabled if you want to start all the daemons on all the nodes from one machine.

Hope this answers your query.

Merge / convert multiple PDF files into one PDF

If you want to join all PDF files in a directory with Ghostscript, you can use find to do just that. Here's an example

find . -name '*.pdf' -exec gs -o -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress -sOutputFile=../out.pdf {} +

Will find all pdf in current directory, and create out.pdf in parent directory. Might be useful if they're looking for a quick way for do an entire directory with ghostscript.

PHP, display image with Header()

Browsers make their best guess with the data they receive. This works for markup (which Websites often get wrong) and other media content. A program that receives a file can often figure out what its received regardless of the MIME content type it's been told.

This isn't something you should rely on however. It's recommended you always use the correct MIME content.

How can I ping a server port with PHP?

 
function ping($ip){
    $output = shell_exec("ping $ip");
    var_dump($output);
}
ping('127.0.0.1');

UPDATE: If you pass an hardcoded IP (like in this example and most of the real-case scenarios), this function can be enough.

But since some users seem to be very concerned about safety, please remind to never pass user generated inputs to the shell_exec function: If the IP comes from an untrusted source, at least check it with a filter before using it.

How to overwrite the previous print to stdout in python?

I had the same question before visiting this thread. For me the sys.stdout.write worked only if I properly flush the buffer i.e.

for x in range(10):
    sys.stdout.write('\r'+str(x))
    sys.stdout.flush()

Without flushing, the result is printed only at the end out the script

How print out the contents of a HashMap<String, String> in ascending order based on its values?

You aren't going to be able to do this from the HashMap class alone.

I would take the Map<String, String> codes, construct a reverse map of TreeMap<String, String> reversedMap where you map the values of the codes Map to the keys (this would require your original Map to have a one-to-one mapping from key-to-value). Since the TreeMap provides Iterators which returns entries in ascending key order, this will give you the value/key combination of the first map in the order (sorted by values) you desire.

Map<String, String> reversedMap = new TreeMap<String, String>(codes);

//then you just access the reversedMap however you like...
for (Map.Entry entry : reversedMap.entrySet()) {
    System.out.println(entry.getKey() + ", " + entry.getValue());
}

There are several collections libraries (commons-collections, Google Collections, etc) which have similar bidirectional Map implementations.

Open Source Javascript PDF viewer

You can use the Google Docs PDF-viewing widget, if you don't mind having them host the "application" itself.

I had more suggestions, but stack overflow only lets me post one hyperlink as a new user, sorry.

How to apply a CSS filter to a background image

Of course, this is not a CSS-solution, but you can use the CDN Proton with filter:

body {
    background: url('https://i0.wp.com/IMAGEURL?w=600&filter=blurgaussian&smooth=1');
}

It is from https://developer.wordpress.com/docs/photon/api/#filter

Quickly create a large file on a Linux system

One approach: if you can guarantee unrelated applications won't use the files in a conflicting manner, just create a pool of files of varying sizes in a specific directory, then create links to them when needed.

For example, have a pool of files called:

  • /home/bigfiles/512M-A
  • /home/bigfiles/512M-B
  • /home/bigfiles/1024M-A
  • /home/bigfiles/1024M-B

Then, if you have an application that needs a 1G file called /home/oracle/logfile, execute a "ln /home/bigfiles/1024M-A /home/oracle/logfile".

If it's on a separate filesystem, you will have to use a symbolic link.

The A/B/etc files can be used to ensure there's no conflicting use between unrelated applications.

The link operation is about as fast as you can get.

how to dynamically add options to an existing select in vanilla javascript

Use the document.createElement function and then add it as a child of your select.

var newOption = document.createElement("option");
newOption.text = 'the options text';
newOption.value = 'some value if you want it';
daySelect.appendChild(newOption);

Select folder dialog WPF

Only such dialog is FileDialog. Its part of WinForms, but its actually only wrapper around WinAPI standard OS file dialog. And I don't think it is ugly, its actually part of OS, so it looks like OS it is run on.

Other way, there is nothing to help you with. You either need to look for 3rd party implementation, either free (and I don't think there are any good) or paid.

Add CSS3 transition expand/collapse

http://jsfiddle.net/Bq6eK/215/

I did not modify your code for this solution, I wrote my own instead. My solution isn't quite what you asked for, but maybe you could build on it with existing knowledge. I commented the code as well so you know what exactly I'm doing with the changes.

As a solution to "avoid setting the height in JavaScript", I just made 'maxHeight' a parameter in the JS function called toggleHeight. Now it can be set in the HTML for each div of class expandable.

I'll say this up front, I'm not super experienced with front-end languages, and there's an issue where I need to click the 'Show/hide' button twice initially before the animation starts. I suspect it's an issue with focus.

The other issue with my solution is that you can actually figure out what the hidden text is without pressing the show/hide button just by clicking in the div and dragging down, you can highlight the text that's not visible and paste it to a visible space.

My suggestion for a next step on top of what I've done is to make it so that the show/hide button changes dynamically. I think you can figure out how to do that with what you already seem to know about showing and hiding text with JS.

How can I inspect element in an Android browser?

Chrome on Android makes it possible to use the Chrome developer tools on the desktop to inspect the HTML that was loaded from the Chrome application on the Android device.

See: https://developers.google.com/chrome-developer-tools/docs/remote-debugging

How do I REALLY reset the Visual Studio window layout?

Note: if you have vs2010 and vs2008 and you want to reset the 2008, you will need to specify in command line the whole path. like this:

"C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\devenv.exe" /resetsettings

If you don't specify the path (like devenv.exe /resetsettings), it will reset the latest version of Visual studio installed on your computer.

Adjust width of input field to its input

Why not using just css? 

<div id="wrapper">
  <input onkeyup="keyup(event)">
  <div id="ghost"></div>
</div>

_x000D_
_x000D_ 
function keyup(e) {_x000D_
 document.getElementById('ghost').innerText = e.target.value;_x000D_
}
_x000D_ 
#wrapper {_x000D_
  position: relative;_x000D_
  min-width: 30px;_x000D_
  display: inline-block;_x000D_
}_x000D_
_x000D_
input {_x000D_
  position: absolute;_x000D_
  left:0;_x000D_
  right:0;_x000D_
  border:1px solid blue;_x000D_
  width: 100%;_x000D_
}_x000D_
_x000D_
#ghost {_x000D_
  color: transparent;_x000D_
}
_x000D_ 
<div id="wrapper">_x000D_
  <input onkeyup="keyup(event)">_x000D_
  <div id="ghost"></div>_x000D_
</div>
_x000D_
_x000D_
_x000D_ 

wrapper {
  position: relative;
  min-width: 30px;
  border: 1px solid red;
  display: inline-block;
}

input {
  position: absolute;
  left:0;
  right:0;
  width: 100%;
}

#ghost {
  color: transparent;
}

this code was introduced by @Iain Todd to and I thought I should share it

flutter corner radius with transparent background

As of May 1st 2019, use BottomSheetTheme.

MaterialApp(
    theme: ThemeData(
      // Draw all modals with a white background and top rounded corners
      bottomSheetTheme: BottomSheetThemeData(
        backgroundColor: Colors.white,
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.vertical(top: Radius.circular(10))
        )
      )
    ),

Introduced recently, using a theme to control the sheets style should be the most best to this problem.

If you want to theme different bottom sheets differently, include a new Theme object in the appropriate subtree to override the bottom sheet theme just for that area.

If for some reason you'd still like to override the theme manually when launching a bottom sheet, showBottomSheet and showModalBottomSheet now have a backgroundColor parameter. Use it like this:

 showModalBottomSheet(
    backgroundColor: Colors.transparent,
    context: context,
    builder: (c) {return NavSheet();},
  );

Using the theme allows bottom sheets to be re-used regardless of the app / app's current theme, and has none of the negative side effects of setting canvas color as mentioned.

How do I keep Python print from adding newlines or spaces?

 
import sys

sys.stdout.write('h')
sys.stdout.flush()

sys.stdout.write('m')
sys.stdout.flush()

You need to call sys.stdout.flush() because otherwise it will hold the text in a buffer and you won't see it.

Calculating Page Load Time In JavaScript

It is hard to make a good timing, because the performance.dominteractive is miscalulated (anyway an interesting link for timing developers).

When dom is parsed it still may load and execute deferred scripts. And inline scripts waiting for css (css blocking dom) has to be loaded also until DOMContentloaded. So it is not yet parsed?

And we have readystatechange event where we can look at readyState that unfortunately is missing "dom is parsed" that happens somewhere between "loaded" and "interactive".

Everything becomes problematic when even not the Timing API gives us a time when dom stoped parsing HTML and starting The End process. This standard say the first point has to be that "interactive" fires precisely after dom parsed! Both Chrome and FF has implemented it when document has finished loading sometime after it has parsed. They seem to (mis)interpret the standars as parsing continues beyond deferred scripts executed while people misinterpret DOMContentLoaded as something hapen before defered executing and not after. Anyway...

My recommendation for you is to read about? Navigation Timing API. Or go the easy way and choose a oneliner of these, or run all three and look in your browsers console ...

  document.addEventListener('readystatechange', function() { console.log("Fiered '" + document.readyState + "' after " + performance.now() + " ms"); });

  document.addEventListener('DOMContentLoaded', function() { console.log("Fiered DOMContentLoaded after " + performance.now() + " ms"); }, false);

  window.addEventListener('load', function() { console.log("Fiered load after " + performance.now() + " ms"); }, false);

The time is in milliseconds after document started. I have verified with Navigation? Timing API.

To get seconds for exampe from the time you did var ti = performance.now() you can do parseInt(performance.now() - ti) / 1000

Instead of that kind of performance.now() subtractions the code get little shorter by User Timing API where you set marks in your code and measure between marks.

Resize a large bitmap file to scaled output file on Android

I don't know if my solution is best practice, but I achieved loading a bitmap with my desired scaling by using the inDensity and inTargetDensity options. inDensity is 0 initially when not loading a drawable resource, so this approach is for loading non resource images.

The variables imageUri, maxImageSideLength and context are parameters of my method. I posted only the method implementation without the wrapping AsyncTask for clarity.

            ContentResolver resolver = context.getContentResolver();
            InputStream is;
            try {
                is = resolver.openInputStream(imageUri);
            } catch (FileNotFoundException e) {
                Log.e(TAG, "Image not found.", e);
                return null;
            }
            Options opts = new Options();
            opts.inJustDecodeBounds = true;
            BitmapFactory.decodeStream(is, null, opts);

            // scale the image
            float maxSideLength = maxImageSideLength;
            float scaleFactor = Math.min(maxSideLength / opts.outWidth, maxSideLength / opts.outHeight);
            // do not upscale!
            if (scaleFactor < 1) {
                opts.inDensity = 10000;
                opts.inTargetDensity = (int) ((float) opts.inDensity * scaleFactor);
            }
            opts.inJustDecodeBounds = false;

            try {
                is.close();
            } catch (IOException e) {
                // ignore
            }
            try {
                is = resolver.openInputStream(imageUri);
            } catch (FileNotFoundException e) {
                Log.e(TAG, "Image not found.", e);
                return null;
            }
            Bitmap bitmap = BitmapFactory.decodeStream(is, null, opts);
            try {
                is.close();
            } catch (IOException e) {
                // ignore
            }

            return bitmap;

What does the regex \S mean in JavaScript?

I believe it means 'anything but a whitespace character'.

DataTables fixed headers misaligned with columns in wide tables

The code below worked. Corrected the issue on I.E 9.0 atleast. Hope this helps

var oTable =  $('#tblList').dataTable({
    "sScrollY": "320px",
    "bScrollCollapse": true,
    });

    setTimeout(function(){
        oTable.fnAdjustColumnSizing();
    },10);

LINQ to read XML

Here are a couple of complete working examples that build on the @bendewey & @dommer examples. I needed to tweak each one a bit to get it to work, but in case another LINQ noob is looking for working examples, here you go:

//bendewey's example using data.xml from OP
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

class loadXMLToLINQ1
{
    static void Main( )
    {
        //Load xml
        XDocument xdoc = XDocument.Load(@"c:\\data.xml"); //you'll have to edit your path

        //Run query
        var lv1s = from lv1 in xdoc.Descendants("level1")
           select new 
           { 
               Header = lv1.Attribute("name").Value,
               Children = lv1.Descendants("level2")
            };

        StringBuilder result = new StringBuilder(); //had to add this to make the result work
        //Loop through results
        foreach (var lv1 in lv1s)
        {
            result.AppendLine("  " + lv1.Header);
            foreach(var lv2 in lv1.Children)
            result.AppendLine("    " + lv2.Attribute("name").Value);
        }
        Console.WriteLine(result.ToString()); //added this so you could see the output on the console
    }
}

And next:

//Dommer's example, using data.xml from OP
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

class loadXMLToLINQ
{
static void Main( )
    {
        XElement rootElement = XElement.Load(@"c:\\data.xml"); //you'll have to edit your path
        Console.WriteLine(GetOutline(0, rootElement));  
    }

static private string GetOutline(int indentLevel, XElement element)
    {
        StringBuilder result = new StringBuilder();
        if (element.Attribute("name") != null)
        {
            result = result.AppendLine(new string(' ', indentLevel * 2) + element.Attribute("name").Value);
        }
        foreach (XElement childElement in element.Elements())
        {
            result.Append(GetOutline(indentLevel + 1, childElement));
        }
        return result.ToString();
    }
}

These both compile & work in VS2010 using csc.exe version 4.0.30319.1 and give the exact same output. Hopefully these help someone else who's looking for working examples of code.

EDIT: added @eglasius' example as well since it became useful to me:

//@eglasius example, still using data.xml from OP
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

class loadXMLToLINQ2
{
    static void Main( )
    {
        StringBuilder result = new StringBuilder(); //needed for result below
        XDocument xdoc = XDocument.Load(@"c:\\deg\\data.xml"); //you'll have to edit your path
        var lv1s = xdoc.Root.Descendants("level1"); 
        var lvs = lv1s.SelectMany(l=>
             new string[]{ l.Attribute("name").Value }
             .Union(
                 l.Descendants("level2")
                 .Select(l2=>"   " + l2.Attribute("name").Value)
              )
            );
        foreach (var lv in lvs)
        {
           result.AppendLine(lv);
        }
        Console.WriteLine(result);//added this so you could see the result
    }
}

How to play a notification sound on websites?

Play cross browser compatible notifications

As adviced by @Tim Tisdall from this post , Check Howler.js Plugin.

Browsers like chrome disables javascript execution when minimized or inactive for performance improvements. But This plays notification sounds even if browser is inactive or minimized by the user.

  var sound =new Howl({
                     src: ['../sounds/rings.mp3','../sounds/rings.wav','../sounds/rings.ogg',
                           '../sounds/rings.aiff'],
                     autoplay: true,
                     loop: true
                    });

               sound.play();

Hope helps someone.

How do I set a Windows scheduled task to run in the background?

As noted by Mattias Nordqvist in the comments below, you can also select the radio button option "Run whether user is logged on or not". When saving the task, you will be prompted once for the user password. bambams noted that this wouldn't grant System permissions to the process, and also seems to hide the command window.

It's not an obvious solution, but to make a Scheduled Task run in the background, change the User running the task to "SYSTEM", and nothing will appear on your screen.

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Jquery button click() function is not working

You need to use a delegated event handler, as the #add elements dynamically appended won't have the click event bound to them. Try this:

$("#buildyourform").on('click', "#add", function() {
    // your code...
});

Also, you can make your HTML strings easier to read by mixing line quotes:

var fieldWrapper = $('<div class="fieldwrapper" name="field' + intId + '" id="field' + intId + '"/>');

Or even supplying the attributes as an object:

var fieldWrapper = $('<div></div>', { 
    'class': 'fieldwrapper',
    'name': 'field' + intId,
    'id': 'field' + intId
});

Compare string with all values in list

In Python you may use the in operator. You can do stuff like this:

>>> "c" in "abc"
True

Taking this further, you can check for complex structures, like tuples:

>>> (2, 4, 8) in ((1, 2, 3), (2, 4, 8))
True

Setting up a JavaScript variable from Spring model by using Thymeleaf

Another way to do it is to create a dynamic javascript returned by a java controller like it is written here in the thymeleaf forum: http://forum.thymeleaf.org/Can-I-use-th-inline-for-a-separate-javascript-file-td4025766.html

One way to handle this is to create a dynamic javascript file with the URLs embedded in it. Here are the steps (if you are using Spring MVC)

@RequestMapping(path = {"/dynamic.js"}, method = RequestMethod.GET, produces = "application/javascript")
@ResponseStatus(value = HttpStatus.OK)
@ResponseBody
public String dynamicJS(HttpServletRequest request) {

        return "Your javascript code....";

}

Passing an array as an argument to a function in C

If you want to pass a single-dimension array as an argument in a function, you would have to declare a formal parameter in one of following three ways and all three declaration methods produce similar results because each tells the compiler that an integer pointer is going to be received.

int func(int arr[], ...){
    .
    .
    .
}

int func(int arr[SIZE], ...){
    .
    .
    .
}

int func(int* arr, ...){
    .
    .
    .
}

So, you are modifying the original values.

Thanks !!!

Can Android do peer-to-peer ad-hoc networking?

Support for peer to peer WiFi networking is available since API level 14.

How can I open two pages from a single click without using JavaScript?

it is working perfectly by only using html 

<p><a href="#"onclick="window.open('http://google.com');window.open('http://yahoo.com');">Click to open Google and Yahoo</a></p>

How do I show my global Git configuration?

On Linux-based systems you can view/edit a configuration file by

vi/vim/nano .git/config

Make sure you are inside the Git init folder.

If you want to work with --global config, it's

vi/vim/nano .gitconfig

on /home/userName

This should help with editing: https://help.github.com/categories/setup/

Is it possible to CONTINUE a loop from an exception?

Notice you can use WHEN exception THEN NULL the same way as you would use WHEN exception THEN continue. Example:

    DECLARE
        extension_already_exists  EXCEPTION;
        PRAGMA EXCEPTION_INIT(extension_already_exists, -20007);
        l_hidden_col_name  varchar2(32);
    BEGIN
        FOR t IN (  SELECT table_name, cast(extension as varchar2(200)) ext
                    FROM all_stat_extensions
                    WHERE owner='{{ prev_schema }}'
                      and droppable='YES'
                    ORDER BY 1
                 )
        LOOP
            BEGIN
                l_hidden_col_name := dbms_stats.create_extended_stats('{{ schema }}', t.table_name, t.ext);
            EXCEPTION
                WHEN extension_already_exists THEN NULL;   -- ignore exception and go to next loop iteration
            END;
        END LOOP;
    END;

jquery, selector for class within id

Just use the plain ol' class selector.

$('#my_id .my_class')

It doesn't matter if the element also has other classes. It has the .my_class class, and it's somewhere inside #my_id, so it will match that selector.

Regarding performance

According to the jQuery selector performance documentation, it's faster to use the two selectors separately, like this:

$('#my_id').find('.my_class')

Here's the relevant part of the documentation:

ID-Based Selectors

// Fast:
$( "#container div.robotarm" );

// Super-fast:
$( "#container" ).find( "div.robotarm" );

The .find() approach is faster because the first selection is handled without going through the Sizzle selector engine – ID-only selections are handled using document.getElementById(), which is extremely fast because it is native to the browser.

Selecting by ID or by class alone (among other things) invokes browser-supplied functions like document.getElementById() which are quite rapid, whereas using a descendent selector invokes the Sizzle engine as mentioned which, although fast, is slower than the suggested alternative.

how to write an array to a file Java

If you're okay with Apache commons lib

outputWriter.write(ArrayUtils.join(array, ","));

CKEditor automatically strips classes from div

I found that switching to use full html instead of filtered html (below the editor in the Text Format dropdown box) is what fixed this problem for me. Otherwise the style would disappear.

HTTP Status 405 - Request method 'POST' not supported (Spring MVC)

The problem is that your controller expect a parameter hasId=false or hasId=true, but you are not passing that. Your hidden field has the id hasId but is passed as hasCustomerName, so no mapping matches.

Either change the path of the hidden field to hasId or the mapping parameter to expect hasCustomerName=true or hasCustomerName=false.

How to hide a mobile browser's address bar?

I know this is old, but I have to add this in here..

And while this is not a full answer, it is an 'IN ADDITION TO'

The address bar will not disappear if you're NOT using https.

ALSO

If you are using https and the address bar still won't hide, you might have some https errors in your webpage (such as certain images being served from a non-https location.)

Hope this helps..

Unrecognized SSL message, plaintext connection? Exception

I've got similar error using camel-mail component to send e-mails by gmail smtp.

The solution was changing from TLS port (587) to SSL port (465) as below:

<route id="sendMail">
  <from uri="jason:toEmail"/>
  <convertBodyTo type="java.lang.String"/>
  <setHeader headerName="Subject"><constant>Something</constant></setHeader>
  <to uri="smtps://smtp.gmail.com:[email protected]&amp;password=mypw&amp;[email protected]&amp;debugMode=true&amp;mail.smtp.starttls.enable=true"/>
</route>

Select multiple columns from a table, but group by one

mysql GROUP_CONCAT function could help https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html#function_group-concat

SELECT ProductID, GROUP_CONCAT(DISTINCT ProductName) as Names, SUM(OrderQuantity)
FROM OrderDetails GROUP BY ProductID

This would return:

ProductID     Names          OrderQuantity
1001          red            5
1002          red,black      6
1003          orange         8
1004          black,orange   15

Similar idea as the one @Urs Marian here posted https://stackoverflow.com/a/38779277/906265

How do I correctly use "Not Equal" in MS Access?

In Access, you will probably find a Join is quicker unless your tables are very small:

SELECT DISTINCT Table1.Column1
FROM Table1 
LEFT JOIN Table2
ON Table1.Column1 = Table2.Column1  
WHERE Table2.Column1 Is Null

This will exclude from the list all records with a match in Table2.

How to use ClassLoader.getResources() correctly?

This is the simplest wat to get the File object to which a certain URL object is pointing at:

File file=new File(url.toURI());

Now, for your concrete questions:

  • finding all resources in the META-INF "directory":

You can indeed get the File object pointing to this URL

Enumeration<URL> en=getClass().getClassLoader().getResources("META-INF");
if (en.hasMoreElements()) {
    URL metaInf=en.nextElement();
    File fileMetaInf=new File(metaInf.toURI());

    File[] files=fileMetaInf.listFiles();
    //or 
    String[] filenames=fileMetaInf.list();
}
  • all resources named bla.xml (recursivly)

In this case, you'll have to do some custom code. Here is a dummy example:

final List<File> foundFiles=new ArrayList<File>();

FileFilter customFilter=new FileFilter() {
    @Override
    public boolean accept(File pathname) {

        if(pathname.isDirectory()) {
            pathname.listFiles(this);
        }
        if(pathname.getName().endsWith("bla.xml")) {
            foundFiles.add(pathname);
            return true;
        }
        return false;
    }

};      
//rootFolder here represents a File Object pointing the root forlder of your search 
rootFolder.listFiles(customFilter);

When the code is run, you'll get all the found ocurrences at the foundFiles List.

Find all files in a folder

First off; best practice would be to get the users Desktop folder with

string path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

Then you can find all the files with something like

string[] files = Directory.GetFiles(path, "*.txt", SearchOption.AllDirectories);

Note that with the above line you will find all files with a .txt extension in the Desktop folder of the logged in user AND all subfolders.

Then you could copy or move the files by enumerating the above collection like

// For copying...
foreach (string s in files)
{
   File.Copy(s, "C:\newFolder\newFilename.txt");
}

// ... Or for moving
foreach (string s in files)
{
   File.Move(s, "C:\newFolder\newFilename.txt");
}

Please note that you will have to include the filename in your Copy() (or Move()) operation. So you would have to find a way to determine the filename of at least the extension you are dealing with and not name all the files the same like what would happen in the above example.

With that in mind you could also check out the DirectoryInfo and FileInfo classes. These work in similair ways, but you can get information about your path-/filenames, extensions, etc. more easily

Check out these for more info:

http://msdn.microsoft.com/en-us/library/system.io.directory.aspx

http://msdn.microsoft.com/en-us/library/ms143316.aspx

http://msdn.microsoft.com/en-us/library/system.io.file.aspx