Cannot use string offset as an array in php

I just want to explain my solving for the same problem.

my code before(given same error):

$arr2= ""; // this is the problem and solve by replace this $arr2 = array();
for($i=2;$i<count($arrdata);$i++){
    $rowx = explode(" ",$arrdata[$i]);
    $arr1= ""; // and this is too
    for($x=0;$x<count($rowx);$x++){
        if($rowx[$x]!=""){
            $arr1[] = $rowx[$x];
        }
    }
    $arr2[] = $arr1;
}
for($i=0;$i<count($arr2);$i++){
    $td .="<tr>";
    for($j=0;$j<count($hcol)-1;$j++){
        $td .= "<td style='border-right:0px solid #000'>".$arr2[$i][$j]."</td>"; //and it's($arr2[$i][$j]) give an error: Cannot use string offset as an array
    }
    $td .="</tr>";
}

my code after and solved it:

$arr2= array(); //change this from $arr2="";
for($i=2;$i<count($arrdata);$i++){
    $rowx = explode(" ",$arrdata[$i]);
    $arr1=array(); //and this
    for($x=0;$x<count($rowx);$x++){
        if($rowx[$x]!=""){
            $arr1[] = $rowx[$x];
        }
    }
    $arr2[] = $arr1;
}
for($i=0;$i<count($arr2);$i++){
    $td .="<tr>";
    for($j=0;$j<count($hcol)-1;$j++){
        $td .= "<td style='border-right:0px solid #000'>".$arr2[$i][$j]."</td>";
    }
    $td .="</tr>";
}

Thank's. Hope it's helped, and sorry if my english mess like boy's room :D

Java Webservice Client (Best way)

You can find some resources related to developing web services client using Apache axis2 here.

http://today.java.net/pub/a/today/2006/12/13/invoking-web-services-using-apache-axis2.html

Below posts gives good explanations about developing web services using Apache axis2.

http://www.ibm.com/developerworks/opensource/library/ws-webaxis1/

http://wso2.org/library/136

Converting Secret Key into a String and Vice Versa

You can convert the SecretKey to a byte array (byte[]), then Base64 encode that to a String. To convert back to a SecretKey, Base64 decode the String and use it in a SecretKeySpec to rebuild your original SecretKey.

For Java 8

SecretKey to String:

// create new key
SecretKey secretKey = KeyGenerator.getInstance("AES").generateKey();
// get base64 encoded version of the key
String encodedKey = Base64.getEncoder().encodeToString(secretKey.getEncoded());

String to SecretKey:

// decode the base64 encoded string
byte[] decodedKey = Base64.getDecoder().decode(encodedKey);
// rebuild key using SecretKeySpec
SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");

For Java 7 and before (including Android):

NOTE I: you can skip the Base64 encoding/decoding part and just store the byte[] in SQLite. That said, performing Base64 encoding/decoding is not an expensive operation and you can store strings in almost any DB without issues.

NOTE II: Earlier Java versions do not include a Base64 in one of the java.lang or java.util packages. It is however possible to use codecs from Apache Commons Codec, Bouncy Castle or Guava.

SecretKey to String:

// CREATE NEW KEY
// GET ENCODED VERSION OF KEY (THIS CAN BE STORED IN A DB)

    SecretKey secretKey;
    String stringKey;

    try {secretKey = KeyGenerator.getInstance("AES").generateKey();}
    catch (NoSuchAlgorithmException e) {/* LOG YOUR EXCEPTION */}

    if (secretKey != null) {stringKey = Base64.encodeToString(secretKey.getEncoded(), Base64.DEFAULT)}

String to SecretKey:

// DECODE YOUR BASE64 STRING
// REBUILD KEY USING SecretKeySpec

    byte[] encodedKey     = Base64.decode(stringKey, Base64.DEFAULT);
    SecretKey originalKey = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");

How do I remove a single breakpoint with GDB?

You can delete all breakpoints using

del <start_breakpoint_num> - <end_breakpoint_num>

To view the start_breakpoint_num and end_breakpoint_num use:

info break

How to define partitioning of DataFrame?

Use the DataFrame returned by:

yourDF.orderBy(account)

There is no explicit way to use partitionBy on a DataFrame, only on a PairRDD, but when you sort a DataFrame, it will use that in it's LogicalPlan and that will help when you need to make calculations on each Account.

I just stumbled upon the same exact issue, with a dataframe that I want to partition by account. I assume that when you say "want to have the data partitioned so that all of the transactions for an account are in the same Spark partition", you want it for scale and performance, but your code doesn't depend on it (like using mapPartitions() etc), right?

SQL exclude a column using SELECT * [except columnA] FROM tableA?

A colleage advised a good alternative:

Do SELECT INTO in your preceding query (where you generate or get the data from) into a table (which you will delete when done). This will create the structure for you.
Do a script as CREATE to new query window.
Remove the unwanted columns. Format the remaining columns into a 1 liner and paste as your column list.
Delete the table you created.

Done...

This helped us a lot.

Facebook page automatic "like" URL (for QR Code)

Have you tried using the fb:// protocol?

To have them like your page when they scan the qr code, it goes like this:

fb://page/(pageID)/addfan

If you need to get the pageID, replace "www" with "graph" in the Facebook url when you visit your page in a desktop browser and it will display the ID and other data.

Not only does this add them automatically, but it opens up the page in the FB app instead of the mobile browser.

As far as legality, I would assume as long as you put something like "Scan to like our page", you're in the clear. They know what they're getting into.

Scroll to element on click in Angular 4

You can scroll to any element ref on your view by using the code block below. Note that the target (elementref id) could be on any valid html tag.

On the view(html file)

<div id="target"> </div>
<button (click)="scroll()">Button</button>

on the .ts file,

scroll() {
   document.querySelector('#target').scrollIntoView({ behavior: 'smooth', block: 'center' });
}

How can I change an element's class with JavaScript?

The OP question was How can I change an element's class with JavaScript?

Modern browsers allow you to do this with one line of javascript:

document.getElementById('id').classList.replace('span1','span2')

The classList attribute provides a DOMTokenList which has a variety of methods. You can operate on an element's classList using simple manipulations like add(), remove() or replace(). Or get very sophisticated and manipulate classes like you would an object or Map with keys(), values(), entries()

Peter Boughton's answer is a great one but it's now over a decade old. All modern browsers now support DOMTokenList - see https://caniuse.com/#search=classList and even IE11 supports some DOMTokenList methods

.htaccess redirect http to https

In cases where the HTTPS/SSL connection is ended at the load balancer and all traffic is sent to instances on port 80, the following rule works to redirect non-secure traffic.

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

Ensure the mod_rewrite module is loaded.

How do I login and authenticate to Postgresql after a fresh install?

There are two methods you can use. Both require creating a user and a database.

By default psql connects to the database with the same name as the user. So there is a convention to make that the "user's database". And there is no reason to break that convention if your user only needs one database. We'll be using mydatabase as the example database name.

Using createuser and createdb, we can be explicit about the database name,
```
$ sudo -u postgres createuser -s $USER
$ createdb mydatabase
$ psql -d mydatabase
```
You should probably be omitting that entirely and letting all the commands default to the user's name instead.
```
$ sudo -u postgres createuser -s $USER
$ createdb
$ psql
```

Using the SQL administration commands, and connecting with a password over TCP

$ sudo -u postgres psql postgres

And, then in the psql shell

CREATE ROLE myuser LOGIN PASSWORD 'mypass';
CREATE DATABASE mydatabase WITH OWNER = myuser;

Then you can login,

$ psql -h localhost -d mydatabase -U myuser -p <port>

If you don't know the port, you can always get it by running the following, as the postgres user,

SHOW port;

Or,

$ grep "port =" /etc/postgresql/*/main/postgresql.conf

Sidenote: the `postgres` user

I suggest NOT modifying the postgres user.

It's normally locked from the OS. No one is supposed to "log in" to the operating system as postgres. You're supposed to have root to get to authenticate as postgres.
It's normally not password protected and delegates to the host operating system. This is a good thing. This normally means in order to log in as postgres which is the PostgreSQL equivalent of SQL Server's SA, you have to have write-access to the underlying data files. And, that means that you could normally wreck havoc anyway.
By keeping this disabled, you remove the risk of a brute force attack through a named super-user. Concealing and obscuring the name of the superuser has advantages.

Get unicode value of a character

char c = 'a';
String a = Integer.toHexString(c); // gives you---> a = "61"

Open files in 'rt' and 'wt' modes

The 'r' is for reading, 'w' for writing and 'a' is for appending.

The 't' represents text mode as apposed to binary mode.

Several times here on SO I've seen people using rt and wt modes for reading and writing files.

Edit: Are you sure you saw rt and not rb?

These functions generally wrap the fopen function which is described here:

http://www.cplusplus.com/reference/cstdio/fopen/

As you can see it mentions the use of b to open the file in binary mode.

The document link you provided also makes reference to this b mode:

Appending 'b' is useful even on systems that don’t treat binary and text files differently, where it serves as documentation.

How to Ping External IP from Java Android

I tried following code, which works for me.

private boolean executeCommand(){
        System.out.println("executeCommand");
        Runtime runtime = Runtime.getRuntime();
        try
        {
            Process  mIpAddrProcess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");
            int mExitValue = mIpAddrProcess.waitFor();
            System.out.println(" mExitValue "+mExitValue);
            if(mExitValue==0){
                return true;
            }else{
                return false;
            }
        }
        catch (InterruptedException ignore)
        {
            ignore.printStackTrace();
            System.out.println(" Exception:"+ignore);
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
            System.out.println(" Exception:"+e);
        }
        return false;
    }

Can Mockito capture arguments of a method called multiple times?

Since Mockito 2.0 there's also possibility to use static method Matchers.argThat(ArgumentMatcher). With the help of Java 8 it is now much cleaner and more readable to write:

verify(mockBar).doSth(argThat((arg) -> arg.getSurname().equals("OneSurname")));
verify(mockBar).doSth(argThat((arg) -> arg.getSurname().equals("AnotherSurname")));

If you're tied to lower Java version there's also not-that-bad:

verify(mockBar).doSth(argThat(new ArgumentMatcher<Employee>() {
        @Override
        public boolean matches(Object emp) {
            return ((Employee) emp).getSurname().equals("SomeSurname");
        }
    }));

Of course none of those can verify order of calls - for which you should use InOrder :

InOrder inOrder = inOrder(mockBar);

inOrder.verify(mockBar).doSth(argThat((arg) -> arg.getSurname().equals("FirstSurname")));
inOrder.verify(mockBar).doSth(argThat((arg) -> arg.getSurname().equals("SecondSurname")));

Please take a look at mockito-java8 project which makes possible to make calls such as:

verify(mockBar).doSth(assertArg(arg -> assertThat(arg.getSurname()).isEqualTo("Surname")));

How does one Display a Hyperlink in React Native App?

Just thought I'd share my hacky solution with anyone who's discovering this problem now with embedded links within a string. It attempts to inline the links by rendering it dynamically with what ever string is fed into it.

Please feel free to tweak it to your needs. It's working for our purposes as such:

This is an example of how https://google.com would appear.

View it on Gist:

https://gist.github.com/Friendly-Robot/b4fa8501238b1118caaa908b08eb49e2

import React from 'react';
import { Linking, Text } from 'react-native';

export default function renderHyperlinkedText(string, baseStyles = {}, linkStyles = {}, openLink) {
  if (typeof string !== 'string') return null;
  const httpRegex = /http/g;
  const wwwRegex = /www/g;
  const comRegex = /.com/g;
  const httpType = httpRegex.test(string);
  const wwwType = wwwRegex.test(string);
  const comIndices = getMatchedIndices(comRegex, string);
  if ((httpType || wwwType) && comIndices.length) {
    // Reset these regex indices because `comRegex` throws it off at its completion. 
    httpRegex.lastIndex = 0;
    wwwRegex.lastIndex = 0;
    const httpIndices = httpType ? 
      getMatchedIndices(httpRegex, string) : getMatchedIndices(wwwRegex, string);
    if (httpIndices.length === comIndices.length) {
      const result = [];
      let noLinkString = string.substring(0, httpIndices[0] || string.length);
      result.push(<Text key={noLinkString} style={baseStyles}>{ noLinkString }</Text>);
      for (let i = 0; i < httpIndices.length; i += 1) {
        const linkString = string.substring(httpIndices[i], comIndices[i] + 4);
        result.push(
          <Text
            key={linkString}
            style={[baseStyles, linkStyles]}
            onPress={openLink ? () => openLink(linkString) : () => Linking.openURL(linkString)}
          >
            { linkString }
          </Text>
        );
        noLinkString = string.substring(comIndices[i] + 4, httpIndices[i + 1] || string.length);
        if (noLinkString) {
          result.push(
            <Text key={noLinkString} style={baseStyles}>
              { noLinkString }
            </Text>
          );
        }
      }
      // Make sure the parent `<View>` container has a style of `flexWrap: 'wrap'`
      return result;
    }
  }
  return <Text style={baseStyles}>{ string }</Text>;
}

function getMatchedIndices(regex, text) {
  const result = [];
  let match;
  do {
    match = regex.exec(text);
    if (match) result.push(match.index);
  } while (match);
  return result;
}

Bootstrap collapse animation not smooth

Padding around the collapsing div must be 0

Set Locale programmatically

Hope this help(in onResume):

Locale locale = new Locale("ru");
Locale.setDefault(locale);
Configuration config = getBaseContext().getResources().getConfiguration();
config.locale = locale;
getBaseContext().getResources().updateConfiguration(config,
      getBaseContext().getResources().getDisplayMetrics());

Update date + one year in mysql

This post helped me today, but I had to experiment to do what I needed. Here is what I found.

Should you want to add more complex time periods, for example 1 year and 15 days, you can use

UPDATE tablename SET datefieldname = curdate() + INTERVAL 15 DAY + INTERVAL 1 YEAR;

I found that using DATE_ADD doesn't allow for adding more than one interval. And there is no YEAR_DAYS interval keyword, though there are others that combine time periods. If you are adding times, use now() rather than curdate().

How can I find where I will be redirected using cURL?

Lot's of regex here, despite the fact i really like them this way might be more stable to me:

$resultCurl=curl_exec($curl); //get curl result
//Optional line if you want to store the http status code
$headerHttpCode=curl_getinfo($curl,CURLINFO_HTTP_CODE);

//let's use dom and xpath
$dom = new \DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($resultCurl, LIBXML_HTML_NODEFDTD);
libxml_use_internal_errors(false);
$xpath = new \DOMXPath($dom);
$head=$xpath->query("/html/body/p/a/@href");

$newUrl=$head[0]->nodeValue;

The location part is a link in the HTML sent by apache. So Xpath is perfect to recover it.

jQuery has deprecated synchronous XMLHTTPRequest

It was mentioned as a comment by @henri-chan, but I think it deserves some more attention:

When you update the content of an element with new html using jQuery/javascript, and this new html contains <script> tags, those are executed synchronously and thus triggering this error. Same goes for stylesheets.

You know this is happening when you see (multiple) scripts or stylesheets being loaded as XHR in the console window. (firefox).

How to break out of the IF statement

I think I know why people would want this. "Run stuff if all conditions are true, otherwise run other stuff". And the conditions are too complicated to put into one if.

Just use a lambda!

if (new Func<bool>(() =>
{
    if (something1)
    {
        if (something2)
        {
            return true;
        }
    }
    return false;
})())
{
    //do stuff
}

MySQL Results as comma separated list

Now only I came across this situation and found some more interesting features around GROUP_CONCAT. I hope these details will make you feel interesting.

simple GROUP_CONCAT

SELECT GROUP_CONCAT(TaskName) 
FROM Tasks;

Result:

+------------------------------------------------------------------+
| GROUP_CONCAT(TaskName)                                           |
+------------------------------------------------------------------+
| Do garden,Feed cats,Paint roof,Take dog for walk,Relax,Feed cats |
+------------------------------------------------------------------+

GROUP_CONCAT with DISTINCT

SELECT GROUP_CONCAT(TaskName) 
FROM Tasks;

Result:

+------------------------------------------------------------------+
| GROUP_CONCAT(TaskName)                                           |
+------------------------------------------------------------------+
| Do garden,Feed cats,Paint roof,Take dog for walk,Relax,Feed cats |
+------------------------------------------------------------------+

GROUP_CONCAT with DISTINCT and ORDER BY

SELECT GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC) 
FROM Tasks;

Result:

+--------------------------------------------------------+
| GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC) |
+--------------------------------------------------------+
| Take dog for walk,Relax,Paint roof,Feed cats,Do garden |
+--------------------------------------------------------+

GROUP_CONCAT with DISTINCT and SEPARATOR

SELECT GROUP_CONCAT(DISTINCT TaskName SEPARATOR ' + ') 
FROM Tasks;

Result:

+----------------------------------------------------------------+
| GROUP_CONCAT(DISTINCT TaskName SEPARATOR ' + ')                |
+----------------------------------------------------------------+
| Do garden + Feed cats + Paint roof + Relax + Take dog for walk |
+----------------------------------------------------------------+

GROUP_CONCAT and Combining Columns

SELECT GROUP_CONCAT(TaskId, ') ', TaskName SEPARATOR ' ') 
FROM Tasks;

Result:

+------------------------------------------------------------------------------------+
| GROUP_CONCAT(TaskId, ') ', TaskName SEPARATOR ' ')                                 |
+------------------------------------------------------------------------------------+
| 1) Do garden 2) Feed cats 3) Paint roof 4) Take dog for walk 5) Relax 6) Feed cats |
+------------------------------------------------------------------------------------+

GROUP_CONCAT and Grouped Results Assume that the following are the results before using GROUP_CONCAT

+------------------------+--------------------------+
| ArtistName             | AlbumName                |
+------------------------+--------------------------+
| Iron Maiden            | Powerslave               |
| AC/DC                  | Powerage                 |
| Jim Reeves             | Singing Down the Lane    |
| Devin Townsend         | Ziltoid the Omniscient   |
| Devin Townsend         | Casualties of Cool       |
| Devin Townsend         | Epicloud                 |
| Iron Maiden            | Somewhere in Time        |
| Iron Maiden            | Piece of Mind            |
| Iron Maiden            | Killers                  |
| Iron Maiden            | No Prayer for the Dying  |
| The Script             | No Sound Without Silence |
| Buddy Rich             | Big Swing Face           |
| Michael Learns to Rock | Blue Night               |
| Michael Learns to Rock | Eternity                 |
| Michael Learns to Rock | Scandinavia              |
| Tom Jones              | Long Lost Suitcase       |
| Tom Jones              | Praise and Blame         |
| Tom Jones              | Along Came Jones         |
| Allan Holdsworth       | All Night Wrong          |
| Allan Holdsworth       | The Sixteen Men of Tain  |
+------------------------+--------------------------+

USE Music;
SELECT ar.ArtistName,
    GROUP_CONCAT(al.AlbumName)
FROM Artists ar
INNER JOIN Albums al
ON ar.ArtistId = al.ArtistId
GROUP BY ArtistName;

Result:

+------------------------+----------------------------------------------------------------------------+
| ArtistName             | GROUP_CONCAT(al.AlbumName)                                                 |
+------------------------+----------------------------------------------------------------------------+
| AC/DC                  | Powerage                                                                   |
| Allan Holdsworth       | All Night Wrong,The Sixteen Men of Tain                                    |
| Buddy Rich             | Big Swing Face                                                             |
| Devin Townsend         | Epicloud,Ziltoid the Omniscient,Casualties of Cool                         |
| Iron Maiden            | Somewhere in Time,Piece of Mind,Powerslave,Killers,No Prayer for the Dying |
| Jim Reeves             | Singing Down the Lane                                                      |
| Michael Learns to Rock | Eternity,Scandinavia,Blue Night                                            |
| The Script             | No Sound Without Silence                                                   |
| Tom Jones              | Long Lost Suitcase,Praise and Blame,Along Came Jones                       |
+------------------------+----------------------------------------------------------------------------+

iOS 10 - Changes in asking permissions of Camera, microphone and Photo Library causing application to crash

[UPDATED privacy keys list to iOS 13 - see below]

There is a list of all Cocoa Keys that you can specify in your Info.plist file:

https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html

(Xcode: Target -> Info -> Custom iOS Target Properties)

iOS already required permissions to access microphone, camera, and media library earlier (iOS 6, iOS 7), but since iOS 10 app will crash if you don't provide the description why you are asking for the permission (it can't be empty).

Privacy keys with example description:

Source

Alternatively, you can open Info.plist as source code:

Source

And add privacy keys like this:

<key>NSLocationAlwaysUsageDescription</key>
<string>${PRODUCT_NAME} always location use</string>

List of all privacy keys: [UPDATED to iOS 13]

NFCReaderUsageDescription
NSAppleMusicUsageDescription
NSBluetoothAlwaysUsageDescription
NSBluetoothPeripheralUsageDescription
NSCalendarsUsageDescription
NSCameraUsageDescription
NSContactsUsageDescription
NSFaceIDUsageDescription
NSHealthShareUsageDescription
NSHealthUpdateUsageDescription
NSHomeKitUsageDescription
NSLocationAlwaysUsageDescription
NSLocationUsageDescription
NSLocationWhenInUseUsageDescription
NSMicrophoneUsageDescription
NSMotionUsageDescription
NSPhotoLibraryAddUsageDescription
NSPhotoLibraryUsageDescription
NSRemindersUsageDescription
NSSiriUsageDescription
NSSpeechRecognitionUsageDescription
NSVideoSubscriberAccountUsageDescription

Update 2019:

In the last months, two of my apps were rejected during the review because the camera usage description wasn't specifying what I do with taken photos.

I had to change the description from ${PRODUCT_NAME} need access to the camera to take a photo to ${PRODUCT_NAME} need access to the camera to update your avatar even though the app context was obvious (user tapped on the avatar).

It seems that Apple is now paying even more attention to the privacy usage descriptions, and we should explain in details why we are asking for permission.

How to define static property in TypeScript interface

@duncan's solution above specifying new() for the static type works also with interfaces:

interface MyType {
    instanceMethod();
}

interface MyTypeStatic {
    new():MyType;
    staticMethod();
}

ORA-01652: unable to extend temp segment by 128 in tablespace SYSTEM: How to extend?

Each tablespace has one or more datafiles that it uses to store data.

The max size of a datafile depends on the block size of the database. I believe that, by default, that leaves with you with a max of 32gb per datafile.

To find out if the actual limit is 32gb, run the following:

select value from v$parameter where name = 'db_block_size';

Compare the result you get with the first column below, and that will indicate what your max datafile size is.

I have Oracle Personal Edition 11g r2 and in a default install it had an 8,192 block size (32gb per data file).

Block Sz   Max Datafile Sz (Gb)   Max DB Sz (Tb)

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

   2,048                  8,192          524,264

   4,096                 16,384        1,048,528

   8,192                 32,768        2,097,056

  16,384                 65,536        4,194,112

  32,768                131,072        8,388,224

You can run this query to find what datafiles you have, what tablespaces they are associated with, and what you've currrently set the max file size to (which cannot exceed the aforementioned 32gb):

select bytes/1024/1024 as mb_size,
       maxbytes/1024/1024 as maxsize_set,
       x.*
from   dba_data_files x

MAXSIZE_SET is the maximum size you've set the datafile to. Also relevant is whether you've set the AUTOEXTEND option to ON (its name does what it implies).

If your datafile has a low max size or autoextend is not on you could simply run:

alter database datafile 'path_to_your_file\that_file.DBF' autoextend on maxsize unlimited;

However if its size is at/near 32gb an autoextend is on, then yes, you do need another datafile for the tablespace:

alter tablespace system add datafile 'path_to_your_datafiles_folder\name_of_df_you_want.dbf' size 10m autoextend on maxsize unlimited;

How to fully clean bin and obj folders within Visual Studio?

For Visual Studio 2015 the MSBuild variables have changed a bit:

  <Target Name="SpicNSpan" AfterTargets="Clean"> <!-- common vars https://msdn.microsoft.com/en-us/library/c02as0cs.aspx?f=255&MSPPError=-2147217396 -->
         <RemoveDir Directories="$(TargetDir)" /> <!-- bin -->
         <RemoveDir Directories="$(SolutionDir).vs" /> <!-- .vs -->
         <RemoveDir Directories="$(ProjectDir)$(BaseIntermediateOutputPath)" /> <!-- obj -->
  </Target>

Notice that this snippet also wipes out the .vs folder from the root directory of your solution. You may want to comment out the associated line if you feel that removing the .vs folder is an overkill. I have it enabled because I noticed that in some third party projects it causes issues when files ala application.config exist inside the .vs folder.

Addendum:

If you are into optimizing the maintainability of your solutions you might want to take things one step further and place the above snippet into a separate file like so:

  <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
       <Target Name="SpicNSpan" AfterTargets="Clean"> <!-- common vars https://msdn.microsoft.com/en-us/library/c02as0cs.aspx?f=255&MSPPError=-2147217396 -->
            <RemoveDir Directories="$(TargetDir)" /> <!-- bin -->
            <RemoveDir Directories="$(SolutionDir).vs" /> <!-- .vs -->
            <RemoveDir Directories="$(ProjectDir)$(BaseIntermediateOutputPath)" /> <!-- obj -->
       </Target>
  </Project>

And then include this file at the very end of each and every one of your *.csproj files like so:

     [...]
     <Import Project="..\..\Tools\ExtraCleanup.targets"/>
  </Project>

This way you can enrich or fine-tune your extra-cleanup-logic centrally, in one place without going through the pains of manually editing each and every *.csproj file by hand every time you want to make an improvement.

How can I remove a key and its value from an associative array?

Using unset:

unset($array['key1'])

Preventing twitter bootstrap carousel from auto sliding on page load

--Use data-interval="false" to stop automatic slide --Use data-wrap="false" to stop circular slide

...

SQL Server : check if variable is Empty or NULL for WHERE clause

If you can use some dynamic query, you can use LEN . It will give false on both empty and null string. By this way you can implement the option parameter.

ALTER PROCEDURE [dbo].[psProducts] 
(@SearchType varchar(50))
AS
BEGIN
    SET NOCOUNT ON;

DECLARE @Query nvarchar(max) = N'
    SELECT 
        P.[ProductId],
        P.[ProductName],
        P.[ProductPrice],
        P.[Type]
    FROM [Product] P'
    -- if @Searchtype is not null then use the where clause
    SET @Query = CASE WHEN LEN(@SearchType) > 0 THEN @Query + ' WHERE p.[Type] = ' + ''''+ @SearchType + '''' ELSE @Query END   

    EXECUTE sp_executesql @Query
    PRINT @Query
END

Parsing ISO 8601 date in Javascript

The Date object handles 8601 as it's first parameter:

_x000D_

var d = new Date("2014-04-07T13:58:10.104Z");_x000D_
console.log(d.toString());

_x000D_

Exporting results of a Mysql query to excel?

The quick and dirty way I use to export mysql output to a file is

$ mysql <database_name> --tee=<file_path>

and then use the exported output (which you can find in <file_path>) wherever I want.

Note that this is the only way you have in order to avoid databases running using the secure-file-priv option, which prevents the usage of INTO OUTFILE suggested in the previous answers:

ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

Convert JavaScript String to be all lower case?

you can use the in built .toLowerCase() method on javascript strings. ex: var x = "Hello"; x.toLowerCase();

Force unmount of NFS-mounted directory

You might try a lazy unmount:

umount -l

Android: ProgressDialog.show() crashes with getApplicationContext

What I did to get around this was to create a base class for all my activities where I store global data. In the first activity, I saved the context in a variable in my base class like so:

Base Class

public static Context myucontext;

First Activity derived from the Base Class

mycontext = this

Then I use mycontext instead of getApplicationContext when creating dialogs.

AlertDialog alertDialog = new AlertDialog.Builder(mycontext).create();

Get the last three chars from any string - Java

You can use a substring

String word = "onetwotwoone"
int lenght = word.length(); //Note this should be function.
String numbers = word.substring(word.length() - 3);

Unable to create Android Virtual Device

Had to restart the Eclipse after completing the installation of ARM EABI v7a system image.

Best way to store data locally in .NET (C#)

I recommend XML reader/writer class for files because it is easily serialized.

Serialization in C#

Serialization (known as pickling in python) is an easy way to convert an object to a binary representation that can then be e.g. written to disk or sent over a wire.

It's useful e.g. for easy saving of settings to a file.

You can serialize your own classes if you mark them with [Serializable] attribute. This serializes all members of a class, except those marked as [NonSerialized].

The following is code to show you how to do this:

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;


namespace ConfigTest
{ [ Serializable() ]

    public class ConfigManager
    {
        private string windowTitle = "Corp";
        private string printTitle = "Inventory";

        public string WindowTitle
        {
            get
            {
                return windowTitle;
            }
            set
            {
                windowTitle = value;
            }
        }

        public string PrintTitle
        {
            get
            {
                return printTitle;
            }
            set
            {
                printTitle = value;
            }
        }
    }
}

You then, in maybe a ConfigForm, call your ConfigManager class and Serialize it!

public ConfigForm()
{
    InitializeComponent();
    cm = new ConfigManager();
    ser = new XmlSerializer(typeof(ConfigManager));
    LoadConfig();
}

private void LoadConfig()
{     
    try
    {
        if (File.Exists(filepath))
        {
            FileStream fs = new FileStream(filepath, FileMode.Open);
            cm = (ConfigManager)ser.Deserialize(fs);
            fs.Close();
        } 
        else
        {
            MessageBox.Show("Could not find User Configuration File\n\nCreating new file...", "User Config Not Found");
            FileStream fs = new FileStream(filepath, FileMode.CreateNew);
            TextWriter tw = new StreamWriter(fs);
            ser.Serialize(tw, cm);
            tw.Close();
            fs.Close();
        }    
        setupControlsFromConfig();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

After it has been serialized, you can then call the parameters of your config file using cm.WindowTitle, etc.

Java SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'") gives timezone as IST

tl;dr

The other Answers are outmoded as of Java 8.

Instant                           // Represent a moment in UTC. 
.parse( "2013-09-29T18:46:19Z" )  // Parse text in standard ISO 8601 format where the `Z` means UTC, pronounces “Zulu”.
.atZone(                          // Adjust from UTC to a time zone. 
    ZoneId.of( "Asia/Kolkata" )
)                                 // Returns a `ZonedDateTime` object.

ISO 8601

Your string format happens to comply with the ISO 8601 standard. This standard defines sensible formats for representing various date-time values as text.

java.time

The old java.util.Date/.Calendar and java.text.SimpleDateFormat classes have been supplanted by the java.time framework built into Java 8 and later. See Tutorial. Avoid the old classes as they have proven to be poorly designed, confusing, and troublesome.

Part of the poor design in the old classes has bitten you, where the toString method applies the JVM's current default time zone when generating a text representation of the date-time value that is actually in UTC (GMT); well-intentioned but confusing.

The java.time classes use ISO 8601 formats by default when parsing/generating textual representations of date-time values. So no need to specify a parsing pattern.

An Instant is a moment on the timeline in UTC.

Instant instant = Instant.parse( "2013-09-29T18:46:19Z" );

You can apply a time zone as needed to produce a ZonedDateTime object.

ZoneId zoneId = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt = instant.atZone( zoneId );

How many spaces will Java String.trim() remove?

One very important thing is that a string made entirely of "white spaces" will return a empty string.

if a string sSomething = "xxxxx", where x stand for white spaces, sSomething.trim() will return an empty string.

if a string sSomething = "xxAxx", where x stand for white spaces, sSomething.trim() will return A.

if sSomething ="xxSomethingxxxxAndSomethingxElsexxx", sSomething.trim() will return SomethingxxxxAndSomethingxElse, notice that the number of x between words is not altered.

If you want a neat packeted string combine trim() with regex as shown in this post: How to remove duplicate white spaces in string using Java?.

Order is meaningless for the result but trim() first would be more efficient. Hope it helps.

Breaking a list into multiple columns in Latex

By combining the multicol package and enumitem package packages it is easy to define environments that are multi-column analogues of the enumerate and itemize environments:

\documentclass{article}
\usepackage{enumitem}
\usepackage{multicol}

\newlist{multienum}{enumerate}{1}
\setlist[multienum]{
    label=\alph*),
    before=\begin{multicols}{2},
    after=\end{multicols}
}

\newlist{multiitem}{itemize}{1}
\setlist[multiitem]{
    label=\textbullet,
    before=\begin{multicols}{2},
    after=\end{multicols}
}

\begin{document}

  \textsf{Two column enumerate}
  \begin{multienum}
    \item item 1
    \item item 2
    \item item 3
    \item item 4
    \item item 5
    \item item 6
  \end{multienum}

  \textsf{Two column itemize}
  \begin{multiitem}
    \item item 1
    \item item 2
    \item item 3
    \item item 4
    \item item 5
    \item item 6
  \end{multiitem}

\end{document}

The output is what you would hope for:

Set div height equal to screen size

use

 $(document).height()

property and set to the div from script and set

  overflow=auto

for scrolling

file path Windows format to java format

Just check

in MacOS

File directory = new File("/Users/sivo03/eclipse-workspace/For4DC/AutomationReportBackup/"+dir);
File directoryApache = new File("/Users/sivo03/Automation/apache-tomcat-9.0.22/webapps/AutomationReport/"+dir);

and same we use in windows

File directory = new File("C:\\Program Files (x86)\\Jenkins\\workspace\\BrokenLinkCheckerALL\\AutomationReportBackup\\"+dir);
File directoryApache = new File("C:\\Users\\Admin\\Downloads\\Automation\\apache-tomcat-9.0.26\\webapps\\AutomationReports\\"+dir);

use double backslash instead of single frontslash

so no need any converter tool just use find and replace

"C:\Documents and Settings\Manoj\Desktop" to "C:\\Documents and Settings\\Manoj\\Desktop"

Git: How to return from 'detached HEAD' state

I had this edge case, where I checked out a previous version of the code in which my file directory structure was different:

git checkout 1.87.1                                    
warning: unable to unlink web/sites/default/default.settings.php: Permission denied
... other warnings ...
Note: checking out '1.87.1'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. 
Example:

  git checkout -b <new-branch-name>

HEAD is now at 50a7153d7... Merge branch 'hotfix/1.87.1'

In a case like this you may need to use --force (when you know that going back to the original branch and discarding changes is a safe thing to do).

git checkout master did not work:

$ git checkout master
error: The following untracked working tree files would be overwritten by checkout:
web/sites/default/default.settings.php
... other files ...

git checkout master --force (or git checkout master -f) worked:

git checkout master -f
Previous HEAD position was 50a7153d7... Merge branch 'hotfix/1.87.1'
Switched to branch 'master'
Your branch is up-to-date with 'origin/master'.

PHP order array by date?

You don't need to convert your dates to timestamp before the sorting, but it's a good idea though because it will take more time to sort without it.

$data = array(
    array(
        "title" => "Another title",
        "date"  => "Fri, 17 Jun 2011 08:55:57 +0200"
    ),
    array(
        "title" => "My title",
        "date"  => "Mon, 16 Jun 2010 06:55:57 +0200"
    )
);

function sortFunction( $a, $b ) {
    return strtotime($a["date"]) - strtotime($b["date"]);
}
usort($data, "sortFunction");
var_dump($data);

Changing PowerShell's default output encoding to UTF-8

To be short, use:

write-output "your text" | out-file -append -encoding utf8 "filename"

Programmatically create a UIView with color gradient

My solution is to create UIView subclass with CAGradientLayer accessible as a readonly property. This will allow you to customize your gradient how you want and you don't need to handle layout changes yourself. Subclass implementation:

@interface GradientView : UIView

@property (nonatomic, readonly) CAGradientLayer *gradientLayer;

@end

@implementation GradientView

+ (Class)layerClass
{
    return [CAGradientLayer class];
}

- (CAGradientLayer *)gradientLayer
{
    return (CAGradientLayer *)self.layer;
}

@end

Usage:

self.iconBackground = [GradientView new];
[self.background addSubview:self.iconBackground];
self.iconBackground.gradientLayer.colors = @[(id)[UIColor blackColor].CGColor, (id)[UIColor whiteColor].CGColor];
self.iconBackground.gradientLayer.startPoint = CGPointMake(1.0f, 1.0f);
self.iconBackground.gradientLayer.endPoint = CGPointMake(0.0f, 0.0f);

How to embed images in html email

Here is a way to get a string variable without having to worry about the coding.

If you have Mozilla Thunderbird, you can use it to fetch the html image code for you.

I wrote a little tutorial here, complete with a screenshot (it's for powershell, but that doesn't matter for this):

powershell email with html picture showing red x

And again:

How to embed images in email

Conditionally change img src based on model data

<ul>
  <li ng-repeat=interface in interfaces>
       <img src='green-checkmark.png' ng-show="interface=='UP'" />
       <img src='big-black-X.png' ng-show="interface=='DOWN'" />
  </li>
</ul>

Clicking the back button twice to exit an activity

you can even make it more simple, and without using a hander, only do this =)

Long firstClick = 1L;
Long secondClick = 0L;

@Override
public void onBackPressed() {
secondClick = System.currentTimeMillis();
    if ((secondClick - firstClick) / 1000 < 2) {
          super.onBackPressed();
    } else {
          firstClick = System.currentTimeMillis();
          Toast.makeText(MainActivity.this, "click BACK again to exit", Toast.LENGTH_SHORT).show();
        }
 }

How to get the current logged in user Id in ASP.NET Core

For .NET Core 2.0 Only The following is required to fetch the UserID of the logged-in User in a Controller class:

var userId = this.User.FindFirstValue(ClaimTypes.NameIdentifier);

var userId = HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier);

e.g.

contact.OwnerID = this.User.FindFirstValue(ClaimTypes.NameIdentifier);

Hide text using css

h1 {
    text-indent: -3000px; 
    line-height: 3000px;
    background-image: url(/LOGO.png);
    height: 100px; width:  600px;  /* height and width are a must */

}

How to get build time stamp from Jenkins build variables?

Generate environment variables from script (Unix script) :

echo "BUILD_DATE=$(date +%F-%T)"

Status bar and navigation bar appear over my view's bounds in iOS 7

Steps For Hide the status bar in iOS 7:

1.Go to your application info.plist file.

2.And Set, View controller-based status bar appearance : Boolean NO

Hope i solved the status bar issue.....

How to setup Tomcat server in Netbeans?

While installing Netbeans itself, you will get an option which servers needs to be installed and integrated with Netbeans. First screen itself will show.

Another option is to reinstall Netbeans by closing all the open projects.

iptables LOG and DROP in one rule

for china GFW:

sudo iptables -I INPUT -s 173.194.0.0/16 -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s 173.194.0.0/16 -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

sudo iptables -I INPUT -s 64.233.0.0/16 -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s 64.233.0.0/16 -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

sudo iptables -I INPUT -s 74.125.0.0/16 -p tcp --tcp-flags RST RST -j DROP
sudo iptables -I INPUT -s 74.125.0.0/16 -p tcp --tcp-flags RST RST -j LOG --log-prefix "drop rst"

Should I use the Reply-To header when sending emails as a service to others?

Here is worked for me:

Subject: SomeSubject
From:Company B (me)
Reply-to:Company A
To:Company A's customers

When should I use a struct rather than a class in C#?

My rule is

1, Always use class;

2, If there is any performance issue, I try to change some class to struct depending on the rules which @IAbstract mentioned, and then do a test to see if these changes can improve performance.

Java - How to find the redirected url of a url?

Have a look at the HttpURLConnection class API documentation, especially setInstanceFollowRedirects().

Split string in Lua?

Depending on the use case, this could be useful. It cuts all text either side of the flags:

b = "This is a string used for testing"

--Removes unwanted text
c = (b:match("a([^/]+)used"))

print (c)

Output:

string

Asynchronous Requests with Python requests

Note

The below answer is not applicable to requests v0.13.0+. The asynchronous functionality was moved to grequests after this question was written. However, you could just replace requests with grequests below and it should work.

I've left this answer as is to reflect the original question which was about using requests < v0.13.0.

To do multiple tasks with async.map asynchronously you have to:

Define a function for what you want to do with each object (your task)
Add that function as an event hook in your request
Call async.map on a list of all the requests / actions

Example:

from requests import async
# If using requests > v0.13.0, use
# from grequests import async

urls = [
    'http://python-requests.org',
    'http://httpbin.org',
    'http://python-guide.org',
    'http://kennethreitz.com'
]

# A simple task to do to each response object
def do_something(response):
    print response.url

# A list to hold our things to do via async
async_list = []

for u in urls:
    # The "hooks = {..." part is where you define what you want to do
    # 
    # Note the lack of parentheses following do_something, this is
    # because the response will be used as the first argument automatically
    action_item = async.get(u, hooks = {'response' : do_something})

    # Add the task to our list of things to do via async
    async_list.append(action_item)

# Do our list of things to do via async
async.map(async_list)

How to recover closed output window in netbeans?

in Netbeans 7.4 try Window -> Output OR Ctrl + 4

What is FCM token in Firebase?

FirebaseInstanceIdService is now deprecated. you should get the Token in the onNewToken method in the FirebaseMessagingService.

Check out the docs

Access non-numeric Object properties by index?

var obj = {
    'key1':'value',
    '2':'value',
    'key 1':'value'
}

console.log(obj.key1)
console.log(obj['key1'])
console.log(obj['2'])
console.log(obj['key 1'])

// will not work
console.log(obj.2)

Edit:

"I'm specifically looking to target the index, just like the first example - if it's possible."

Actually the 'index' is the key. If you want to store the position of a key you need to create a custom object to handle this.

Android: Get checked checkbox values

MySQL query finding values in a comma separated string

The classic way would be to add commas to the left and right:

select * from shirts where CONCAT(',', colors, ',') like '%,1,%'

But find_in_set also works:

select * from shirts where find_in_set('1',colors) <> 0

How can I get the full object in Node.js's console.log(), rather than '[Object]'?

You can use JSON.stringify, and get some nice indentation as well as perhaps easier to remember syntax.

console.log(JSON.stringify(myObject, null, 4));

{
    "a": "a",
    "b": {
        "c": "c",
        "d": {
            "e": "e",
            "f": {
                "g": "g",
                "h": {
                    "i": "i"
                }
            }
        }
    }
}

The third argument sets the indentation level, so you can adjust that as desired.

More detail here if needed:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

send mail to multiple receiver with HTML mailto

"There are no safe means of assigning multiple recipients to a single mailto: link via HTML. There are safe, non-HTML, ways of assigning multiple recipients from a mailto: link."

http://www.sightspecific.com/~mosh/www_faq/multrec.html

For a quick fix to your problem, change your ; to a comma , and eliminate the spaces between email addresses

<a href='mailto:[email protected],[email protected]'>Email Us</a>

Pythonic way to combine FOR loop and IF statement

You can use generator expressions like this:

gen = (x for x in xyz if x not in a)

for x in gen:
    print x

Passing parameters in rails redirect_to

Just append them to the options:

redirect_to controller: 'thing', action: 'edit', id: 3, something: 'else'

Would yield /thing/3/edit?something=else

Matching special characters and letters in regex

Try this regex:

/^[\w&.-]+$/

Also you can use test.

if ( pattern.test( qry ) ) {
  // valid
}

Assigning strings to arrays of characters

Note that you can still do:

s[0] = 'h';
s[1] = 'e';
s[2] = 'l';
s[3] = 'l';
s[4] = 'o';
s[5] = '\0';

How do I run a Python script on my web server?

Very simply, you can rename your Python script to "pythonscript.cgi". Post that in your cgi-bin directory, add the appropriate permissions and browse to it.

This is a great link you can start with.

Here's another good one.

Hope that helps.

EDIT (09/12/2015): The second link has long been removed. Replaced it with one that provides information referenced from the original.

How to stop VBA code running?

Add another button called "CancelButton" that sets a flag, and then check for that flag.

If you have long loops in the "stuff" then check for it there too and exit if it's set. Use DoEvents inside long loops to ensure that the UI works.

Bool Cancel
Private Sub CancelButton_OnClick()
    Cancel=True
End Sub
...
Private Sub SomeVBASub
    Cancel=False
    DoStuff
    If Cancel Then Exit Sub
    DoAnotherStuff
    If Cancel Then Exit Sub
    AndFinallyDothis
End Sub

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in

This error comes when there is error in your query syntax check field names table name, mean check your query syntax.

Could not install packages due to an EnvironmentError: [WinError 5] Access is denied:

run the same command using '--user'

Rails 2.3.4 Persisting Model on Validation Failure

In your controller, render the new action from your create action if validation fails, with an instance variable, @car populated from the user input (i.e., the params hash). Then, in your view, add a logic check (either an if block around the form or a ternary on the helpers, your choice) that automatically sets the value of the form fields to the params values passed in to @car if car exists. That way, the form will be blank on first visit and in theory only be populated on re-render in the case of error. In any case, they will not be populated unless @car is set.

How to schedule a stored procedure in MySQL

If you're open to out-of-the-DB solution: You could set up a cron job that runs a script that will itself call the procedure.

How to append a date in batch files

If you know your regional settings won't change you can do it as follows:

if your short date format is dd/MM/yyyy:

SET MYDATE=%DATE:~3,2%%DATE:~0,2%%DATE:~8,4%
if your short date format is MM/dd/yyyy:

SET MYDATE=%DATE:~0,2%%DATE:~3,2%%DATE:~8,4%

But there's no general way to do it that's independent of your regional settings.

I would not recommend relying on regional settings for anything that's going to be used in a production environment. Instead you should consider using another scripting language - PowerShell, VBScript, ...

For example, if you create a VBS file yyyymmdd.vbs in the same directory as your batch file with the following contents:

' yyyymmdd.vbs - outputs the current date in the format yyyymmdd
Function Pad(Value, PadCharacter, Length)
    Pad = Right(String(Length,PadCharacter) & Value, Length)
End Function

Dim Today
Today = Date
WScript.Echo Pad(Year(Today), "0", 4) & Pad(Month(Today), "0", 2) & Pad(Day(Today), "0", 2)

then you will be able to call it from your batch file thus:

FOR /F %%i IN ('cscript "%~dp0yyyymmdd.vbs" //Nologo') do SET MYDATE=%%i
echo %MYDATE%

Of course there will eventually come a point where rewriting your batch file in a more powerful scripting language will make more sense than mixing it with VBScript in this way.

SQL Server table creation date query

For 2005 up, you can use

SELECT
        [name]
       ,create_date
       ,modify_date
FROM
        sys.tables

I think for 2000, you need to have enabled auditing.

MySQL Server has gone away when importing large sql file

I got same issue with

$image_base64 = base64_encode(file_get_contents($_FILES['file']['tmp_name']) );
$image = 'data:image/jpeg;base64,'.$image_base64;
$query = "insert into images(image) values('".$image."')";
mysqli_query($con,$query);

In \xampp\mysql\bin\my.ini file of phpmyadmin we get only

[mysqldump]
max_allowed_packet=110M

which is just for mysqldump -u root -p dbname . I resolved my issue by replacing above code with

max_allowed_packet=110M
[mysqldump]
max_allowed_packet=110M

How to write LaTeX in IPython Notebook?

I came across this problem some day using colab. And I find the most painless way is just running this code before printing. Everything works like charm then.

from IPython.display import Math, HTML

def load_mathjax_in_cell_output():
  display(HTML("<script src='https://www.gstatic.com/external_hosted/"
               "mathjax/latest/MathJax.js?config=default'></script>"))
get_ipython().events.register('pre_run_cell', load_mathjax_in_cell_output)
import sympy as sp
sp.init_printing()

The result looks like this:

How do I find out if first character of a string is a number?

Regular expressions are very strong but expensive tool. It is valid to use them for checking if the first character is a digit but it is not so elegant :) I prefer this way:

public boolean isLeadingDigit(final String value){
    final char c = value.charAt(0);
    return (c >= '0' && c <= '9');
}

How to extract string following a pattern with grep, regex or perl

Since you need to match content without including it in the result (must match name=" but it's not part of the desired result) some form of zero-width matching or group capturing is required. This can be done easily with the following tools:

Perl

With Perl you could use the n option to loop line by line and print the content of a capturing group if it matches:

perl -ne 'print "$1\n" if /name="(.*?)"/' filename

GNU grep

If you have an improved version of grep, such as GNU grep, you may have the -P option available. This option will enable Perl-like regex, allowing you to use \K which is a shorthand lookbehind. It will reset the match position, so anything before it is zero-width.

grep -Po 'name="\K.*?(?=")' filename

The o option makes grep print only the matched text, instead of the whole line.

Vim - Text Editor

Another way is to use a text editor directly. With Vim, one of the various ways of accomplishing this would be to delete lines without name= and then extract the content from the resulting lines:

:v/.*name="\v([^"]+).*/d|%s//\1

Standard grep

If you don't have access to these tools, for some reason, something similar could be achieved with standard grep. However, without the look around it will require some cleanup later:

grep -o 'name="[^"]*"' filename

A note about saving results

In all of the commands above the results will be sent to stdout. It's important to remember that you can always save them by piping it to a file by appending:

> result

to the end of the command.

What is the purpose of using -pedantic in GCC/G++ compiler?

I use it all the time in my coding.

The -ansi flag is equivalent to -std=c89. As noted, it turns off some extensions of GCC. Adding -pedantic turns off more extensions and generates more warnings. For example, if you have a string literal longer than 509 characters, then -pedantic warns about that because it exceeds the minimum limit required by the C89 standard. That is, every C89 compiler must accept strings of length 509; they are permitted to accept longer, but if you are being pedantic, it is not portable to use longer strings, even though a compiler is permitted to accept longer strings and, without the pedantic warnings, GCC will accept them too.

PHP code is not being executed, instead code shows on the page

php7 :

sudo a2enmod proxy_fcgi setenvif
sudo a2enconf php7.0-fpm
sudo service apache2 restart

Creating files and directories via Python

    import os
    os.mkdir('directory name') #### this command for creating directory
    os.mknod('file name') #### this for creating files
    os.system('touch filename') ###this is another method for creating file by using unix commands in os modules

How do you read a CSV file and display the results in a grid in Visual Basic 2010?

Consider this CodeProject article/project: LINQ TO CSV.

It will enable you to create a custom class that is shaped like your .csv file's columns. You'd then consume the CSV and bind to your DataGridView.

Dim cc As new CsvContext()
Dim inputFileDescription As New CsvFileDescription() With { _
    .SeparatorChar = ","C, _
    .FirstLineHasColumnNames = True _
}

Dim products As IEnumerable(Of Product) = _
     cc.Read(Of Product)("products.csv", inputFileDescription)

' query from CSV, load into a new class of your own   
Dim productsByName = From p In products
    Select New CustomDisplayClass With _
       {.Name = p.Name, .SomeDate = p.SomeDate, .Price = p.Price}, _        
    Order By p.Name


myDataGridView1.DataSource = products
myDataGridView1.DataBind()

How do I get the difference between two Dates in JavaScript?

In JavaScript, dates can be transformed to the number of milliseconds since the epoc by calling the getTime() method or just using the date in a numeric expression.

So to get the difference, just subtract the two dates.

To create a new date based on the difference, just pass the number of milliseconds in the constructor.

var oldBegin = ...
var oldEnd = ...
var newBegin = ...

var newEnd = new Date(newBegin + oldEnd - oldBegin);

This should just work

EDIT: Fixed bug pointed by @bdukes

EDIT:

For an explanation of the behavior, oldBegin, oldEnd, and newBegin are Date instances. Calling operators + and - will trigger Javascript auto casting and will automatically call the valueOf() prototype method of those objects. It happens that the valueOf() method is implemented in the Date object as a call to getTime().

So basically: date.getTime() === date.valueOf() === (0 + date) === (+date)

How to identify unused CSS definitions from multiple CSS files in a project

I have just found this site – http://unused-css.com/

Looks good but I would need to thoroughly check its outputted 'clean' css before uploading it to any of my sites.

Also as with all these tools I would need to check it didn't strip id's and classes with no style but are used as JavaScript selectors.

The below content is taken from http://unused-css.com/ so credit to them for recommending other solutions:

Latish Sehgal has written a windows application to find and remove unused CSS classes. I haven't tested it but from the description, you have to provide the path of your html files and one CSS file. The program will then list the unused CSS selectors. From the screenshot, it looks like there is no way to export this list or download a new clean CSS file. It also looks like the service is limited to one CSS file. If you have multiple files you want to clean, you have to clean them one by one.

Dust-Me Selectors is a Firefox extension (for v1.5 or later) that finds unused CSS selectors. It extracts all the selectors from all the stylesheets on the page you're viewing, then analyzes that page to see which of those selectors are not used. The data is then stored so that when testing subsequent pages, selectors can be crossed off the list as they're encountered. This tool is supposed to be able to spider a whole website but I unfortunately could make it work. Also, I don't believe you can configure and download the CSS file with the styles removed.

Topstyle is a windows application including a bunch of tools to edit CSS. I haven't tested it much but it looks like it has the ability to removed unused CSS selectors. This software costs 80 USD.

Liquidcity CSS cleaner is a php script that uses regular expressions to check the styles of one page. It will tell you the classes that aren't available in the HTML code. I haven't tested this solution.

Deadweight is a CSS coverage tool. Given a set of stylesheets and a set of URLs, it determines which selectors are actually used and lists which can be "safely" deleted. This tool is a ruby module and will only work with rails website. The unused selectors have to be manually removed from the CSS file.

Helium CSS is a javascript tool for discovering unused CSS across many pages on a web site. You first have to install the javascript file to the page you want to test. Then, you have to call a helium function to start the cleaning.

UnusedCSS.com is web application with an easy to use interface. Type the url of a site and you will get a list of CSS selectors. For each selector, a number indicates how many times a selector is used. This service has a few limitations. The @import statement is not supported. You can't configure and download the new clean CSS file.

CSSESS is a bookmarklet that helps you find unused CSS selectors on any site. This tool is pretty easy to use but it won't let you configure and download clean CSS files. It will only list unused CSS files.

Implementation difference between Aggregation and Composition in Java

The difference is that any composition is an aggregation and not vice versa.

Let's set the terms. The Aggregation is a metaterm in the UML standard, and means BOTH composition and shared aggregation, simply named shared. Too often it is named incorrectly "aggregation". It is BAD, for composition is an aggregation, too. As I understand, you mean "shared".

Further from UML standard:

composite - Indicates that the property is aggregated compositely, i.e., the composite object has responsibility for the existence and storage of the composed objects (parts).

So, University to cathedras association is a composition, because cathedra doesn't exist out of University (IMHO)

Precise semantics of shared aggregation varies by application area and modeler.

I.e., all other associations can be drawn as shared aggregations, if you are only following to some principles of yours or of somebody else. Also look here.

Bootstrap Align Image with text

You have two choices, either correct your markup so that it uses correct elements and utilizes the Bootstrap grid system:

_x000D_

@import url('http://getbootstrap.com/dist/css/bootstrap.css');

_x000D_

<div class="container">_x000D_
     <h1>About Me</h1>_x000D_
    <div class="row">_x000D_
        <div class="col-md-4">_x000D_
            <div class="imgAbt">_x000D_
                <img width="220" height="220" src="img/me.jpg" />_x000D_
            </div>_x000D_
        </div>_x000D_
        <div class="col-md-8">_x000D_
            <p>Lots of text here...With the four tiers of grids available you're bound to run into issues where, at certain breakpoints, your columns don't clear quite right as one is taller than the other. To fix that, use a combination of a .clearfix and o</p>_x000D_
        </div>_x000D_
    </div>_x000D_
</div>

_x000D_

Or, if you wish the text to closely wrap the image, change your markup to:

_x000D_

@import url('http://getbootstrap.com/dist/css/bootstrap.css');

_x000D_

<div class="container">_x000D_
    <h1>About Me</h1>_x000D_
    <div class="row">_x000D_
        <div class="col-md-12">_x000D_
            <img style='float:left;width:200px;height:200px; margin-right:10px;' src="img/me.jpg" />_x000D_
            <p>Lots of text here...With the four tiers of grids available you're bound to run into issues where, at certain breakpoints, your columns don't clear quite right as one is taller than the other. To fix that, use a combination of a .clearfix and o</p>_x000D_
        </div>_x000D_
    </div>

_x000D_

How to change the Spyder editor background to dark?

hey there go to GITHUB link here(https://github.com/joonro/Spyder-Color-Themes) do as the page says u can get the stunning tomorrow night theme

How do I group Windows Form radio buttons?

Look at placing your radio buttons in a GroupBox.

How to determine when a Git branch was created?

very simple

In the address bar of your web browser, type the following URL and press the Enter key to retrieve information of a GitHub repository.

https://api.github.com/repos/{:owner}/{:repository}

Note! In the URL above, replace the {:owner} and {:repository} parts with the values that can be found in the URL of the GitHub repository for which you want to know the creation date. For example, if the URL of the repository is https://github.com/ArthurGareginyan/batch-rename/, then the URL of it’s information will be https://api.github.com/repos/ArthurGareginyan/batch-rename.

output:

How to disable registration new users in Laravel

In Laravel 5.5

Working on a similar issue and setting the middleware argument from guest to 'auth' seemed like a more elegant solution.

Edit File: app->http->Controllers->Auth->RegisterController.php

public function __construct()
{
     //replace this
     //$this->middleware('guest');

     //with this argument.
       $this->middleware('auth');
}

I could be wrong though...but it seems more slick than editing the routing with more lines and less shity than simply redirecting the page...at least in this instance, wanting to lock down the registration for guests.

How to create number input field in Flutter?

You can specify the number as keyboardType for the TextField using:

keyboardType: TextInputType.number

Check my main.dart file

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new MaterialApp(
      home: new HomePage(),
      theme: new ThemeData(primarySwatch: Colors.blue),
    );
  }
}

class HomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return new HomePageState();
  }
}

class HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      backgroundColor: Colors.white,
      body: new Container(
          padding: const EdgeInsets.all(40.0),
          child: new Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          new TextField(
            decoration: new InputDecoration(labelText: "Enter your number"),
            keyboardType: TextInputType.number,
            inputFormatters: <TextInputFormatter>[
    FilteringTextInputFormatter.digitsOnly
], // Only numbers can be entered
          ),
        ],
      )),
    );
  }
}

Change Input to Upper Case

I couldn't find the text-uppercase in Bootstrap referred to in one of the answers. No matter, I created it;

.text-uppercase {
  text-transform: uppercase;
}

This displays text in uppercase, but the underlying data is not transformed in this way. So in jquery I have;

$(".text-uppercase").keyup(function () {
    this.value = this.value.toLocaleUpperCase();
});

This will change the underlying data wherever you use the text-uppercase class.

How can I convert an MDB (Access) file to MySQL (or plain SQL file)?

OSX users can follow by Nicolay77 or mikkom that uses the mdbtools utility. You can install it via Homebrew. Just have your homebrew installed and then go

$ homebrew install mdbtools

Then create one of the scripts described by the guys and use it. I've used mikkom's one, converted all my mdb files into sql.

$ ./to_mysql.sh myfile.mdb > myfile.sql

(which btw contains more than 1 table)

Complete list of reasons why a css file might not be working

Firefox can reject a stylesheet if it is not served with a content type of "text/css". (This is separate from the 'type="text/css"' declaration in the HTML.)

How do I make UITableViewCell's ImageView a fixed size even when the image is smaller

This solution essentially draws the image as 'aspect fit' within the given rect.

CGSize itemSize = CGSizeMake(80, 80);
UIGraphicsBeginImageContextWithOptions(itemSize, NO, UIScreen.mainScreen.scale);
UIImage *image = cell.imageView.image;

CGRect imageRect;
if(image.size.height > image.size.width) {
    CGFloat width = itemSize.height * image.size.width / image.size.height;
    imageRect = CGRectMake((itemSize.width - width) / 2, 0, width, itemSize.height);
} else {
    CGFloat height = itemSize.width * image.size.height / image.size.width;
    imageRect = CGRectMake(0, (itemSize.height - height) / 2, itemSize.width, height);
}

[cell.imageView.image drawInRect:imageRect];
cell.imageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

POSTing JSON to URL via WebClient in C#

The question is already answered but I think I've found the solution that is simpler and more relevant to the question title, here it is:

var cli = new WebClient();
cli.Headers[HttpRequestHeader.ContentType] = "application/json";
string response = cli.UploadString("http://some/address", "{some:\"json data\"}");

PS: In the most of .net implementations, but not in all WebClient is IDisposable, so of cource it is better to do 'using' or 'Dispose' on it. However in this particular case it is not really necessary.

How do I search for files in Visual Studio Code?

Is it possible to disable floating headers in UITableView with UITableViewStylePlain?

WARNING: this solution implements a reserved API method. This could prevent the app from being approved by Apple for distribution on the AppStore.

I've described the private methods that turns of section headers floating in my blog

Basically, you just need to subclass UITableView and return NO in two of its methods:

- (BOOL)allowsHeaderViewsToFloat;
- (BOOL)allowsFooterViewsToFloat;

grep for special characters in Unix

A related note

To grep for carriage return, namely the \r character, or 0x0d, we can do this:

grep -F $'\r' application.log

Alternatively, use printf, or echo, for POSIX compatibility

grep -F "$(printf '\r')" application.log

And we can use hexdump, or less to see the result:

$ printf "a\rb" | grep -F $'\r' | hexdump -c
0000000   a  \r   b  \n

Regarding the use of $'\r' and other supported characters, see Bash Manual > ANSI-C Quoting:

Words of the form $'string' are treated specially. The word expands to string, with backslash-escaped characters replaced as specified by the ANSI C standard

Scrollable Menu with Bootstrap - Menu expanding its container when it should not

Do everything in the inline of UL tag

<ul class="dropdown-menu scrollable-menu" role="menu" style="height: auto;max-height: 200px; overflow-x: hidden;">
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
                <li><a href="#">Something else here</a></li>
                <li><a href="#">Action</a></li>
                ..
                <li><a href="#">Action</a></li>
                <li><a href="#">Another action</a></li>
            </ul>

What does functools.wraps do?

Prerequisite: You must know how to use decorators and specially with wraps. This comment explains it a bit clear or this link also explains it pretty well.
Whenever we use For eg: @wraps followed by our own wrapper function. As per the details given in this link , it says that

functools.wraps is convenience function for invoking update_wrapper() as a function decorator, when defining a wrapper function.

It is equivalent to partial(update_wrapper, wrapped=wrapped, assigned=assigned, updated=updated).

So @wraps decorator actually gives a call to functools.partial(func[,*args][, **keywords]).

The functools.partial() definition says that

The partial() is used for partial function application which “freezes” some portion of a function’s arguments and/or keywords resulting in a new object with a simplified signature. For example, partial() can be used to create a callable that behaves like the int() function where the base argument defaults to two:

>>> from functools import partial
>>> basetwo = partial(int, base=2)
>>> basetwo.__doc__ = 'Convert base 2 string to an int.'
>>> basetwo('10010')
18

Which brings me to the conclusion that, @wraps gives a call to partial() and it passes your wrapper function as a parameter to it. The partial() in the end returns the simplified version i.e the object of what's inside the wrapper function and not the wrapper function itself.

How to create temp table using Create statement in SQL Server?

Same thing, Just start the table name with # or ##:

CREATE TABLE #TemporaryTable          -- Local temporary table - starts with single #
(
    Col1 int,
    Col2 varchar(10)
    ....
);

CREATE TABLE ##GlobalTemporaryTable   -- Global temporary table - note it starts with ##.
(
    Col1 int,
    Col2 varchar(10)
    ....
);

Temporary table names start with # or ## - The first is a local temporary table and the last is a global temporary table.

Here is one of many articles describing the differences between them.

How to get Python requests to trust a self signed SSL certificate?

try:

r = requests.post(url, data=data, verify='/path/to/public_key.pem')

The developers of this app have not set up this app properly for Facebook Login?

after a lot of tries, I've read in other topics which someone said "delete all your apps and create it again". I did that but, as you can imagine, a new App will create a new Application ID on Facebook's page.

So, even after all the "set public things" it didn't work because the application ID was wrong in my code due to the creation of a new App on Facebook developer page.

So, as AndrewSmiley said above, you should remeber to update that in your app @strings

Most efficient way to reverse a numpy array

In order to have it working with negative numbers and a long list you can do the following:

b = numpy.flipud(numpy.array(a.split(),float))

Where flipud is for 1d arra

Command failed due to signal: Segmentation fault: 11

I actually screwed up Core Data entities a bit while porting from Swift 2.0 to 1.2 (don't ask why) I deleted all the entity classes and recreated them again. I got lots of error messages then and when I fixed them all the project built successfully.

How to install PIP on Python 3.6?

Yes, Python3.6 installs PIP but it is unreachable as it is installed. There is no code which will invoke it as it is! I have been at it for more than a week and I read every single advice given, without success!

Finally, I tested going to the pip directory and upgrading the installed version:

root@bx:/usr/local/lib/python3.6/site-packages # python -m pip install --upgrade pip

That command created a PIP which now works properly from any location on my FreeBSD server!

Clearly, the tools installed simply do not work, as installed with Python3.6. The only way to run them is to invoke Python and the desired python files as you can see in the command issued. Once the update is called, however, the new PIP works globally without having to invoke Python3.6...

Two-way SSL clarification

Both certificates should exist prior to the connection. They're usually created by Certification Authorities (not necessarily the same). (There are alternative cases where verification can be done differently, but some verification will need to be made.)

The server certificate should be created by a CA that the client trusts (and following the naming conventions defined in RFC 6125).

The client certificate should be created by a CA that the server trusts.

It's up to each party to choose what it trusts.

There are online CA tools that will allow you to apply for a certificate within your browser and get it installed there once the CA has issued it. They need not be on the server that requests client-certificate authentication.

The certificate distribution and trust management is the role of the Public Key Infrastructure (PKI), implemented via the CAs. The SSL/TLS client and servers and then merely users of that PKI.

When the client connects to a server that requests client-certificate authentication, the server sends a list of CAs it's willing to accept as part of the client-certificate request. The client is then able to send its client certificate, if it wishes to and a suitable one is available.

The main advantages of client-certificate authentication are:

The private information (the private key) is never sent to the server. The client doesn't let its secret out at all during the authentication.
A server that doesn't know a user with that certificate can still authenticate that user, provided it trusts the CA that issued the certificate (and that the certificate is valid). This is very similar to the way passports are used: you may have never met a person showing you a passport, but because you trust the issuing authority, you're able to link the identity to the person.

You may be interested in Advantages of client certificates for client authentication? (on Security.SE).

AngularJS - Value attribute on an input text box is ignored when there is a ng-model used?

This is a slight modification to the earlier answers...

There is no need for $parse

angular.directive('input', [function () {
  'use strict';

  var directiveDefinitionObject = {
    restrict: 'E',
    require: '?ngModel',
    link: function postLink(scope, iElement, iAttrs, ngModelController) {
      if (iAttrs.value && ngModelController) {
        ngModelController.$setViewValue(iAttrs.value);
      }
    }
  };

  return directiveDefinitionObject;
}]);

How to check for the type of a template parameter?

In C++17, we can use variants.

To use std::variant, you need to include the header:

#include <variant>

After that, you may add std::variant in your code like this:

using Type = std::variant<Animal, Person>;

template <class T>
void foo(Type type) {
    if (std::is_same_v<type, Animal>) {
        // Do stuff...
    } else {
        // Do stuff...
    }
}

Change the color of glyphicons to blue in some- but not at all places using Bootstrap 2

The icon will adopt the color from value of the color css property of it's parent.

You can either add this directly to the style:

<span class="glyphicon glyphicon-user" style="color:blue"></span>

Or you can add it as a class to your icon and then set the font color to it in CSS

HTML

<span class="glyphicon glyphicon-search"></span>
<span class="glyphicon glyphicon-user blue"></span>
<span class="glyphicon glyphicon-trash"></span>

CSS

.blue {
    color: blue;
}

This fiddle has an example.

Capitalize words in string

This solution dose not use regex, supports accented characters and also supported by almost every browser.

function capitalizeIt(str) {
    if (str && typeof(str) === "string") {
        str = str.split(" ");    
        for (var i = 0, x = str.length; i < x; i++) {
            if (str[i]) {
                str[i] = str[i][0].toUpperCase() + str[i].substr(1);
            }
        }
        return str.join(" ");
    } else {
        return str;
    }
}

Usage:

console.log(capitalizeIt('çao 2nd inside Javascript programme'));

Output:

Çao 2nd Inside Javascript Programme

How do I install g++ for Fedora?

Just make a sample 'Hello World' Program and try to compile it using "g++ sam.cpp" in terminal, and it will ask you if you wish to download the g++ package. Press y to install.

How can I create a Java 8 LocalDate from a long Epoch time in Milliseconds?

You can start with Instant.ofEpochMilli(long):

LocalDate date =
  Instant.ofEpochMilli(startDateLong)
  .atZone(ZoneId.systemDefault())
  .toLocalDate();

How to change color in circular progress bar?

You can change your progressbar colour using the code below:

progressBar.getProgressDrawable().setColorFilter(
    getResources().getColor(R.color.your_color), PorterDuff.Mode.SRC_IN);

MySQL: how to get the difference between two timestamps in seconds

How about "TIMESTAMPDIFF":

SELECT TIMESTAMPDIFF(SECOND,'2009-05-18','2009-07-29') from `post_statistics`

https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html#function_timestampdiff

Guzzle 6: no more json() method for responses

Adding ->getContents() doesn't return jSON response, instead it returns as text.

You can simply use json_decode

catch specific HTTP error in python

Python 3

from urllib.error import HTTPError

Python 2

from urllib2 import HTTPError

Just catch HTTPError, handle it, and if it's not Error 404, simply use raise to re-raise the exception.

See the Python tutorial.

e.g. complete example for Pyhton 2

import urllib2
from urllib2 import HTTPError
try:
   urllib2.urlopen("some url")
except HTTPError as err:
   if err.code == 404:
       <whatever>
   else:
       raise

Sorting JSON by values

Here's a multiple-level sort method. I'm including a snippet from an Angular JS module, but you can accomplish the same thing by scoping the sort keys objects such that your sort function has access to them. You can see the full module at Plunker.

$scope.sortMyData = function (a, b)
{
  var retVal = 0, key;
  for (var i = 0; i < $scope.sortKeys.length; i++)
  {
    if (retVal !== 0)
    {
      break;
    }
    else
    {
      key = $scope.sortKeys[i];
      if ('asc' === key.direction)
      {
        retVal = (a[key.field] < b[key.field]) ? -1 : (a[key.field] > b[key.field]) ? 1 : 0;
      }
      else
      {
        retVal = (a[key.field] < b[key.field]) ? 1 : (a[key.field] > b[key.field]) ? -1 : 0;
      }
    }
  }
  return retVal;
};

How can I pad a value with leading zeros?

Yet another version :

function zPad(s,n){
    return (new Array(n+1).join('0')+s).substr(-Math.max(n,s.toString().length));
}

Styling a input type=number

UPDATE 17/03/2017

Original solution won't work anymore. The spinners are part of shadow dom. For now just to hide in chrome use:

_x000D_

input[type=number]::-webkit-inner-spin-button {_x000D_
  -webkit-appearance: none;_x000D_
}

_x000D_

<input type="number" />

_x000D_

or to always show:

_x000D_

input[type=number]::-webkit-inner-spin-button {_x000D_
  opacity: 1;_x000D_
}

_x000D_

<input type="number" />

_x000D_

~~You can try the following but keep in mind that works only for Chrome:~~

_x000D_
_x000D_
input[type=number]::-webkit-inner-spin-button { _x000D_ -webkit-appearance: none;_x000D_ cursor:pointer;_x000D_ display:block;_x000D_ width:8px;_x000D_ color: #333;_x000D_ text-align:center;_x000D_ position:relative;_x000D_ }_x000D_ _x000D_ input[type=number]::-webkit-inner-spin-button:before,_x000D_ input[type=number]::-webkit-inner-spin-button:after {_x000D_ content: "^";_x000D_ position:absolute;_x000D_ right: 0;_x000D_ }_x000D_ _x000D_ input[type=number]::-webkit-inner-spin-button:before {_x000D_ top:0px;_x000D_ }_x000D_ _x000D_ input[type=number]::-webkit-inner-spin-button:after {_x000D_ bottom:0px;_x000D_ -webkit-transform: rotate(180deg);_x000D_ }
_x000D_
<input type="number" />
_x000D_
_x000D_
_x000D_

Toolbar Navigation Hamburger Icon missing

Replace the default Up-arrow with your own drawable

getSupportActionBar().setHomeAsUpIndicator(R.drawable.hamburger);

What are the possible values of the Hibernate hbm2ddl.auto configuration and what do they do

If you don't want to use Strings in your app and are looking for predefined constants have a look at org.hibernate.cfg.AvailableSettings class included in the Hibernate JAR, where you'll find a constant for all possible settings. In your case for example:

/**
 * Auto export/update schema using hbm2ddl tool. Valid values are <tt>update</tt>,
 * <tt>create</tt>, <tt>create-drop</tt> and <tt>validate</tt>.
 */
String HBM2DDL_AUTO = "hibernate.hbm2ddl.auto";

How do I create a readable diff of two spreadsheets using git diff?

We faced the exact same issue in our co. Our tests output excel workbooks. Binary diff was not an option. So we rolled out our own simple command line tool. Check out the ExcelCompare project. Infact this allows us to automate our tests quite nicely. Patches / Feature requests quite welcome!

Javascript ajax call on page onload

You can use jQuery to do that for you.

 $(document).ready(function() {
   // put Ajax here.
 });

Check it here:

http://docs.jquery.com/Tutorials:Introducing_%24%28document%29.ready%28%29

Android: How to add R.raw to project?

(With reference to Android Studio)

Create a new directory in res folder. Make sure to create new "Android Resource Directory" and not new "Directory".

Then ensure that there is at least one valid file in it. It should show up now.

How to select first and last TD in a row?

You can use the following snippet:

  tr td:first-child {text-decoration: underline;}
  tr td:last-child {color: red;}

Using the following pseudo classes:

:first-child means "select this element if it is the first child of its parent".

:last-child means "select this element if it is the last child of its parent".

Only element nodes (HTML tags) are affected, these pseudo-classes ignore text nodes.

Bootstrap fixed header and footer with scrolling body-content area in fluid-container

Another option would be using flexbox.

While it's not supported by IE8 and IE9, you could consider:

Not minding about those old IE versions
Providing a fallback
Using a polyfill

Despite some additional browser-specific style prefixing would be necessary for full cross-browser support, you can see the basic usage either on this fiddle and on the following snippet:

_x000D_

html {_x000D_
  height: 100%;_x000D_
}_x000D_
html body {_x000D_
  height: 100%;_x000D_
  overflow: hidden;_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
}_x000D_
html body .container-fluid.body-content {_x000D_
  width: 100%;_x000D_
  overflow-y: auto;_x000D_
}_x000D_
header {_x000D_
    background-color: #4C4;_x000D_
    min-height: 50px;_x000D_
    width: 100%;_x000D_
}_x000D_
footer {_x000D_
    background-color: #4C4;_x000D_
    min-height: 30px;_x000D_
    width: 100%;_x000D_
}

_x000D_

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<header></header>_x000D_
<div class="container-fluid body-content">_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
  Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>Lorem Ipsum<br/>_x000D_
</div>_x000D_
<footer></footer>

_x000D_

How to remove all MySQL tables from the command-line without DROP database permissions?

The @Devart's version is correct, but here are some improvements to avoid having error. I've edited the @Devart's answer, but it was not accepted.

SET FOREIGN_KEY_CHECKS = 0;
SET GROUP_CONCAT_MAX_LEN=32768;
SET @tables = NULL;
SELECT GROUP_CONCAT('`', table_name, '`') INTO @tables
  FROM information_schema.tables
  WHERE table_schema = (SELECT DATABASE());
SELECT IFNULL(@tables,'dummy') INTO @tables;

SET @tables = CONCAT('DROP TABLE IF EXISTS ', @tables);
PREPARE stmt FROM @tables;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET FOREIGN_KEY_CHECKS = 1;

This script will not raise error with NULL result in case when you already deleted all tables in the database by adding at least one nonexistent - "dummy" table.

And it fixed in case when you have many tables.

And This small change to drop all view exist in the Database

SET FOREIGN_KEY_CHECKS = 0;
SET GROUP_CONCAT_MAX_LEN=32768;
SET @views = NULL;
SELECT GROUP_CONCAT('`', TABLE_NAME, '`') INTO @views
  FROM information_schema.views
  WHERE table_schema = (SELECT DATABASE());
SELECT IFNULL(@views,'dummy') INTO @views;

SET @views = CONCAT('DROP VIEW IF EXISTS ', @views);
PREPARE stmt FROM @views;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET FOREIGN_KEY_CHECKS = 1;

It assumes that you run the script from Database you want to delete. Or run this before:

USE REPLACE_WITH_DATABASE_NAME_YOU_WANT_TO_DELETE;

Thank you to Steve Horvath to discover the issue with backticks.

Determining type of an object in ruby

I would say "Yes". As "Matz" had said something like this in one of his talks, "Ruby objects have no types." Not all of it but the part that he is trying to get across to us. Why would anyone have said "Everything is an Object" then? To add he said "Data has Types not objects".

So we might enjoy this.

https://www.youtube.com/watch?v=1l3U1X3z0CE

But Ruby doesn't care to much about the type of object just the class. We use classes not types. All data then has a class.

12345.class

'my string'.class

They may also have ancestors

Object.ancestors

They also have meta classes but I'll save you the details on that.

Once you know the class then you'll be able to lookup what methods you may use for it. That's where the "data type" is needed. If you really want to get into details the look up...

"The Ruby Object Model"

This is the term used for how Ruby handles objects. It's all internal so you don't really see much of this but it's nice to know. But that's another topic.

Yes! The class is the data type. Objects have classes and data has types. So if you know about data bases then you know there are only a finite set of types.

text blocks numbers

Use jquery to set value of div tag

try this function $('div.total-title').text('test');

Android: how to parse URL String with spaces to URI object?

I wrote this function:

public static String encode(@NonNull String uriString) {
    if (TextUtils.isEmpty(uriString)) {
        Assert.fail("Uri string cannot be empty!");
        return uriString;
    }
    // getQueryParameterNames is not exist then cannot iterate on queries
    if (Build.VERSION.SDK_INT < 11) {
        return uriString;
    }

    // Check if uri has valid characters
    // See https://tools.ietf.org/html/rfc3986
    Pattern allowedUrlCharacters = Pattern.compile("([A-Za-z0-9_.~:/?\\#\\[\\]@!$&'()*+,;" +
            "=-]|%[0-9a-fA-F]{2})+");
    Matcher matcher = allowedUrlCharacters.matcher(uriString);
    String validUri = null;
    if (matcher.find()) {
        validUri = matcher.group();
    }
    if (TextUtils.isEmpty(validUri) || uriString.length() == validUri.length()) {
        return uriString;
    }

    // The uriString is not encoded. Then recreate the uri and encode it this time
    Uri uri = Uri.parse(uriString);
    Uri.Builder uriBuilder = new Uri.Builder()
            .scheme(uri.getScheme())
            .authority(uri.getAuthority());
    for (String path : uri.getPathSegments()) {
        uriBuilder.appendPath(path);
    }
    for (String key : uri.getQueryParameterNames()) {
        uriBuilder.appendQueryParameter(key, uri.getQueryParameter(key));
    }
    String correctUrl = uriBuilder.build().toString();
    return correctUrl;
}

How can I add an item to a SelectList in ASP.net MVC

Okay I like clean code so I made this an extension method

static public class SelectListHelper
{
    static public SelectList Add(this SelectList list, string text, string value = "", ListPosition listPosition = ListPosition.First)
    {
        if (string.IsNullOrEmpty(value))
        {
            value = text;
        }
        var listItems = list.ToList();
        var lp = (int)listPosition;
        switch (lp)
        {
            case -1:
                lp = list.Count();
                break;
            case -2:
                lp = list.Count() / 2;
                break;
            case -3:
                var random = new Random();
                lp = random.Next(0, list.Count());
                break;
        }
        listItems.Insert(lp, new SelectListItem { Value = value, Text = text });
        list = new SelectList(listItems, "Value", "Text");
        return list;
    }

    public enum ListPosition
    {
        First = 0,
        Last = -1,
        Middle = -2,
        Random = -3
    }
}

Usage (by example):

var model = new VmRoutePicker
    {
     Routes =
     new SelectList(_dataSource.Routes.Select(r => r.RouteID).Distinct())
     };                                     
  model.Routes = model.Routes.Add("All", "All", SelectListHelper.ListPosition.Random);
//or
  model.Routes = model.Routes.Add("All");

Get timezone from DateTime

There is a public domain TimeZone library for .NET. Really useful. It will answer your needs.

Solving the general-case timezone problem is harder than you think.

socket programming multiple client to one server

For every client you need to start separate thread. Example:

public class ThreadedEchoServer {

    static final int PORT = 1978;

    public static void main(String args[]) {
        ServerSocket serverSocket = null;
        Socket socket = null;

        try {
            serverSocket = new ServerSocket(PORT);
        } catch (IOException e) {
            e.printStackTrace();

        }
        while (true) {
            try {
                socket = serverSocket.accept();
            } catch (IOException e) {
                System.out.println("I/O error: " + e);
            }
            // new thread for a client
            new EchoThread(socket).start();
        }
    }
}

and

public class EchoThread extends Thread {
    protected Socket socket;

    public EchoThread(Socket clientSocket) {
        this.socket = clientSocket;
    }

    public void run() {
        InputStream inp = null;
        BufferedReader brinp = null;
        DataOutputStream out = null;
        try {
            inp = socket.getInputStream();
            brinp = new BufferedReader(new InputStreamReader(inp));
            out = new DataOutputStream(socket.getOutputStream());
        } catch (IOException e) {
            return;
        }
        String line;
        while (true) {
            try {
                line = brinp.readLine();
                if ((line == null) || line.equalsIgnoreCase("QUIT")) {
                    socket.close();
                    return;
                } else {
                    out.writeBytes(line + "\n\r");
                    out.flush();
                }
            } catch (IOException e) {
                e.printStackTrace();
                return;
            }
        }
    }
}

You can also go with more advanced solution, that uses NIO selectors, so you will not have to create thread for every client, but that's a bit more complicated.

ASP.NET MVC3 - textarea with @Html.EditorFor

Declare in your Model with

  [DataType(DataType.MultilineText)]
  public string urString { get; set; }

Then in .cshtml can make use of editor as below. you can make use of @cols and @rows for TextArea size

     @Html.EditorFor(model => model.urString, new { htmlAttributes = new { @class = "",@cols = 35, @rows = 3 } })

Thanks !

Change bar plot colour in geom_bar with ggplot2 in r

If you want all the bars to get the same color (fill), you can easily add it inside geom_bar.

ggplot(data=df, aes(x=c1+c2/2, y=c3)) + 
geom_bar(stat="identity", width=c2, fill = "#FF6666")

Add fill = the_name_of_your_var inside aes to change the colors depending of the variable :

c4 = c("A", "B", "C")
df = cbind(df, c4)
ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2)

Use scale_fill_manual() if you want to manually the change of colors.

ggplot(data=df, aes(x=c1+c2/2, y=c3, fill = c4)) + 
geom_bar(stat="identity", width=c2) + 
scale_fill_manual("legend", values = c("A" = "black", "B" = "orange", "C" = "blue"))

How to get the index of a maximum element in a NumPy array along one axis

There is argmin() and argmax() provided by numpy that returns the index of the min and max of a numpy array respectively.

Say e.g for 1-D array you'll do something like this

_x000D_

import numpy as np

a = np.array([50,1,0,2])

print(a.argmax()) # returns 0
print(a.argmin()) # returns 2

_x000D_

And similarly for multi-dimensional array

_x000D_

import numpy as np

a = np.array([[0,2,3],[4,30,1]])

print(a.argmax()) # returns 4
print(a.argmin()) # returns 0

_x000D_

Note that these will only return the index of the first occurrence.

What does it mean to write to stdout in C?

@K Scott Piel wrote a great answer here, but I want to add one important point.

Note that the stdout stream is usually line-buffered, so to ensure the output is actually printed and not just left sitting in the buffer waiting to be written you must flush the buffer by either ending your printf statement with a \n

Ex:

printf("hello world\n");

printf("hello world"); 
printf("\n");

or similar, OR you must call fflush(stdout); after your printf call.

Ex:

printf("hello world"); 
fflush(stdout);

How to shrink/purge ibdata1 file in MySQL

In a new version of mysql-server recipes above will crush "mysql" database. In old version it works. In new some tables switches to table type INNODB, and by doing so you will damage them. The easiest way is to:

dump all you databases
uninstall mysql-server,
add in remained my.cnf:

    [mysqld]
    innodb_file_per_table=1

erase all in /var/lib/mysql
install mysql-server
restore users and databases

How Can I Override Style Info from a CSS Class in the Body of a Page?

Either use the style attribute to add CSS inline on your divs, e.g.:

<div style="color:red"> ... </div>

... or create your own style sheet and reference it after the existing stylesheet then your style sheet should take precedence.

... or add a <style> element in the <head> of your HTML with the CSS you need, this will take precedence over an external style sheet.

You can also add !important after your style values to override other styles on the same element.

Update

Use one of my suggestions above and target the span of class style21, rather than the containing div. The style you are applying on the containing div will not be inherited by the span as it's color is set in the style sheet.

Links in <select> dropdown options

You can use this code:

<select id="menu" name="links" size="1" onchange="window.location.href=this.value;">
    <option value="URL">Book</option>
    <option value="URL">Pen</option>
    <option value="URL">Read</option>
    <option value="URL">Apple</option>
</select>

A good Sorted List for Java

It seems that you want a list structure with very fast removal and random access by index (not by key) times. An ArrayList gives you the latter and a HashMap or TreeMap give you the former.

There is one structure in Apache Commons Collections that may be what you are looking for, the TreeList. The JavaDoc specifies that it is optimized for quick insertion and removal at any index in the list. If you also need generics though, this will not help you.

Keras model.summary() result - Understanding the # of Parameters

The number of parameters is 7850 because with every hidden unit you have 784 input weights and one weight of connection with bias. This means that every hidden unit gives you 785 parameters. You have 10 units so it sums up to 7850.

The role of this additional bias term is really important. It significantly increases the capacity of your model. You can read details e.g. here Role of Bias in Neural Networks.

What is __gxx_personality_v0 for?

I had this error once and I found out the origin:

I was using a gcc compiler and my file was called CLIENT.C despite I was doing a C program and not a C++ program.

gcc recognizes the .C extension as C++ program and .c extension as C program (be careful to the small c and big C).

So I renamed my file CLIENT.c program and it worked.

Apply jQuery datepicker to multiple instances

In my case, I had not given my <input> elements any ID, and was using a class to apply the datepicker as in SeanJA's answer, but the datepicker was only being applied to the first one. I discovered that JQuery was automatically adding an ID and it was the same one in all of the elements, which explained why only the first was getting datepickered.

IOException: Too many open files

You can handle the fds yourself. The exec in java returns a Process object. Intermittently check if the process is still running. Once it has completed close the processes STDERR, STDIN, and STDOUT streams (e.g. proc.getErrorStream.close()). That will mitigate the leaks.

How to make a Java thread wait for another thread's output?

Requirement ::

To wait execution of next thread until previous finished.

Next thread must not start until previous thread stops, irrespective of time consumption.

It must be simple and easy to use.

Answer ::

@See java.util.concurrent.Future.get() doc.

future.get() Waits if necessary for the computation to complete, and then retrieves its result.

Job Done!! See example below

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.junit.Test;

public class ThreadTest {

    public void print(String m) {
        System.out.println(m);
    }

    public class One implements Callable<Integer> {

        public Integer call() throws Exception {
            print("One...");
            Thread.sleep(6000);
            print("One!!");
            return 100;
        }
    }

    public class Two implements Callable<String> {

        public String call() throws Exception {
            print("Two...");
            Thread.sleep(1000);
            print("Two!!");
            return "Done";
        }
    }

    public class Three implements Callable<Boolean> {

        public Boolean call() throws Exception {
            print("Three...");
            Thread.sleep(2000);
            print("Three!!");
            return true;
        }
    }

    /**
     * @See java.util.concurrent.Future.get() doc
     *      <p>
     *      Waits if necessary for the computation to complete, and then
     *      retrieves its result.
     */
    @Test
    public void poolRun() throws InterruptedException, ExecutionException {
        int n = 3;
        // Build a fixed number of thread pool
        ExecutorService pool = Executors.newFixedThreadPool(n);
        // Wait until One finishes it's task.
        pool.submit(new One()).get();
        // Wait until Two finishes it's task.
        pool.submit(new Two()).get();
        // Wait until Three finishes it's task.
        pool.submit(new Three()).get();
        pool.shutdown();
    }
}

Output of this program ::

One...
One!!
Two...
Two!!
Three...
Three!!

You can see that takes 6sec before finishing its task which is greater than other thread. So Future.get() waits until the task is done.

If you don't use future.get() it doesn't wait to finish and executes based time consumption.

Good Luck with Java concurrency.

How to calculate the sum of the datatable column in asp.net?

To calculate the sum of a column in a DataTable use the DataTable.Compute method.

Example of usage from the linked MSDN article:

DataTable table = dataSet.Tables["YourTableName"];

// Declare an object variable.
object sumObject;
sumObject = table.Compute("Sum(Amount)", string.Empty);

Display the result in your Total Amount Label like so:

lblTotalAmount.Text = sumObject.ToString();

Python For loop get index

Use the enumerate() function to generate the index along with the elements of the sequence you are looping over:

for index, w in enumerate(loopme):
    print "CURRENT WORD IS", w, "AT CHARACTER", index

How do I reference the input of an HTML <textarea> control in codebehind?

You are not using a .NET control for your text area. Either add runat="server" to the HTML TextArea control or use a .NET control:

Try this:

<asp:TextBox id="TextArea1" TextMode="multiline" Columns="50" Rows="5" runat="server" />

Then reference it in your codebehind:

message.Body = TextArea1.Text;

What does the 'b' character do in front of a string literal?

The answer to the question is that, it does:

data.encode()

and in order to decode it(remove the b, because sometimes you don't need it)

use:

data.decode()

MySQL & Java - Get id of the last inserted value (JDBC)

Wouldn't you just change:

numero = stmt.executeUpdate(query);

to:

numero = stmt.executeUpdate(query, Statement.RETURN_GENERATED_KEYS);

Take a look at the documentation for the JDBC Statement interface.

Update: Apparently there is a lot of confusion about this answer, but my guess is that the people that are confused are not reading it in the context of the question that was asked. If you take the code that the OP provided in his question and replace the single line (line 6) that I am suggesting, everything will work. The numero variable is completely irrelevant and its value is never read after it is set.

How do I monitor all incoming http requests?

Using Wireshark..

I have not tried this: http://wiki.wireshark.org/CaptureSetup/Loopback

If that works, you could then filter for http/http contains GET/http contains POST traffic.

You might have to run two Wireshark instances, one capturing local, and one capturing remote. I'm not sure.

Xcode 4: create IPA file instead of .xcarchive

I went threw the same problem. None of the answers above worked for me, but i ended finding the solution on my own. The ipa file wasn't created because there was library files (libXXX.a) in Target-> Build Phases -> Copy Bundle with resources

Hope it will help someone :)

Is <div style="width: ;height: ;background: "> CSS?

Yes, it is called Inline CSS, Here you styling the div using some height, width, and background.

Here the example:

<div style="width:50px;height:50px;background color:red">

You can achieve same using Internal or External CSS

2.Internal CSS:

  <head>
    <style>
    div {
    height:50px;
    width:50px;
    background-color:red;
    foreground-color:white;
    }
    </style>
  </head>
  <body>
    <div></div>
  </body>

3.External CSS:

<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div></div>
</body>

style.css /external css file/

 div {
        height:50px;
        width:50px;
        background-color:red;
    }

Error: Can't set headers after they are sent to the client

This error happens when you send 2 responses. For example :

if(condition A)
{ 

      res.render('Profile', {client:client_});

}

if (condition B){

      res.render('Profile', {client:client_});
    }
  }

Imagine if for some reason condition A and B are true so in the second render you'll get that error

What character represents a new line in a text area

By HTML specifications, browsers are required to canonicalize line breaks in user input to CR LF (\r\n), and I don’t think any browser gets this wrong. Reference: clause 17.13.4 Form content types in the HTML 4.01 spec.

In HTML5 drafts, the situation is more complicated, since they also deal with the processes inside a browser, not just the data that gets sent to a server-side form handler when the form is submitted. According to them (and browser practice), the textarea element value exists in three variants:

the raw value as entered by the user, unnormalized; it may contain CR, LF, or CR LF pair;
the internal value, called “API value”, where line breaks are normalized to LF (only);
the submission value, where line breaks are normalized to CR LF pairs, as per Internet conventions.

Difference between array_map, array_walk and array_filter

From the documentation,

bool array_walk ( array &$array , callback $funcname [, mixed $userdata ] ) <-return bool

array_walk takes an array and a function F and modifies it by replacing every element x with F(x).

array array_map ( callback $callback , array $arr1 [, array $... ] )<-return array

array_map does the exact same thing except that instead of modifying in-place it will return a new array with the transformed elements.

array array_filter ( array $input [, callback $callback ] )<-return array

array_filter with function F, instead of transforming the elements, will remove any elements for which F(x) is not true

What is the most efficient/quickest way to loop through rows in VBA (excel)?

If you are just looping through 10k rows in column A, then dump the row into a variant array and then loop through that.

You can then either add the elements to a new array (while adding rows when needed) and using Transpose() to put the array onto your range in one move, or you can use your iterator variable to track which row you are on and add rows that way.

Dim i As Long
Dim varray As Variant

varray = Range("A2:A" & Cells(Rows.Count, "A").End(xlUp).Row).Value

For i = 1 To UBound(varray, 1)
    ' do stuff to varray(i, 1)
Next

Here is an example of how you could add rows after evaluating each cell. This example just inserts a row after every row that has the word "foo" in column A. Not that the "+2" is added to the variable i during the insert since we are starting on A2. It would be +1 if we were starting our array with A1.

Sub test()

Dim varray As Variant
Dim i As Long

varray = Range("A2:A10").Value

'must step back or it'll be infinite loop
For i = UBound(varray, 1) To LBound(varray, 1) Step -1
    'do your logic and evaluation here
    If varray(i, 1) = "foo" Then
       'not how to offset the i variable 
       Range("A" & i + 2).EntireRow.Insert
    End If
Next

End Sub

Cannot install packages using node package manager in Ubuntu

Here's another approach I use since I like n for easy switching between node versions.

On a new Ubuntu system, first install the 'system' node:

curl -sL https://deb.nodesource.com/setup | sudo bash -

Then install n module globally:

npm install -g n

Since the system node was installed first (above), the alternatives system can be used to cleanly point to the node provided by n. First make sure the alternatives system has nothing for node:

update-alternatives --remove-all node

Then add the node provided by n:

update-alternatives --install /usr/bin/node node /usr/local/bin/node 1

Next add node provided by the system (the one that was installed with curl):

update-alternatives --install /usr/bin/node node /usr/bin/nodejs 2

Now select the node provided by n using the interactive menu (select /usr/local/bin/node from the menu presented by the following command):

update-alternatives --config node

Finally, since /usr/local/bin usually has a higher precedence in PATH than /usr/bin, the following alias must be created (enter in your .bashrc or .zshrc) if the alternatives system node is to be effective; otherwise the node installed with n in /usr/local/bin takes always precedence:

alias node='/usr/bin/node'

Now you can easily switch between node versions with n <desired node version number>.

How to define an enum with string value?

We can't define enumeration as string type. The approved types for an enum are byte, sbyte, short, ushort, int, uint, long, or ulong.

If you need more details on enumeration please follow below link,that link will help you to understand enumeration. Enumeration

@narendras1414

How to find the size of integer array

If array is static allocated:

size_t size = sizeof(arr) / sizeof(int);

if array is dynamic allocated(heap):

int *arr = malloc(sizeof(int) * size);

where variable size is a dimension of the arr.

MySQL Multiple Joins in one query?

You can simply add another join like this:

SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename
FROM dashboard_data 
    INNER JOIN dashboard_messages 
        ON dashboard_message_id = dashboard_messages.id
    INNER JOIN images
        ON dashboard_messages.image_id = images.image_id

However be aware that, because it is an INNER JOIN, if you have a message without an image, the entire row will be skipped. If this is a possibility, you may want to do a LEFT OUTER JOIN which will return all your dashboard messages and an image_filename only if one exists (otherwise you'll get a null)

SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename
FROM dashboard_data 
    INNER JOIN dashboard_messages 
        ON dashboard_message_id = dashboard_messages.id
    LEFT OUTER JOIN images
        ON dashboard_messages.image_id = images.image_id

How do I send an HTML email?

If you are using Google app engine/Java, then use the following...

MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(SENDER_EMAIL_ADDRESS, "Admin"));
msg.addRecipient(Message.RecipientType.TO,
                 new InternetAddress(toAddress, "user");

msg.setSubject(subject,"UTF-8");

Multipart mp = new MimeMultipart();
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(message, "text/html");
mp.addBodyPart(htmlPart);
msg.setContent(mp);
Transport.send(msg);

How to ignore PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException?

Set validateTLSCertificates property to false for your JSoup command.

Jsoup.connect("https://google.com/").validateTLSCertificates(false).get();

Check if starting characters of a string are alphabetical in T-SQL

You don't need to use regex, LIKE is sufficient:

WHERE my_field LIKE '[a-zA-Z][a-zA-Z]%'

Assuming that by "alphabetical" you mean only latin characters, not anything classified as alphabetical in Unicode.

Note - if your collation is case sensitive, it's important to specify the range as [a-zA-Z]. [a-z] may exclude A or Z. [A-Z] may exclude a or z.

Find in Files: Search all code in Team Foundation Server

Team Foundation Server 2015 (on-premises) and Visual Studio Team Services (cloud version) include built-in support for searching across all your code and work items.

You can do simple string searches like foo, boolean operations like foo OR bar or more complex language-specific things like class:WebRequest

You can read more about it here: https://www.visualstudio.com/en-us/docs/search/overview

Location of GlassFish Server Logs

tail -f /path/to/glassfish/domains/YOURDOMAIN/logs/server.log

You can also upload log from admin console : http://yoururl:4848

enter image description here

How to put a jar in classpath in Eclipse?

As of rev 17 of the Android Developer Tools, the correct way to add a library jar when.using the tools and Eclipse is to create a directory called libs on the same level as your src and assets directories and then drop the jar in there. Nothing else.required, the tools take care of all the rest for you automatically.

How to round a floating point number up to a certain decimal place?

Here is a simple function to do this for you:

def precision(num,x):
    return "{0:.xf}".format(round(num))

Here, num is the decimal number. x is the decimal up to where you want to round a floating number.

The advantage over other implementation is that it can fill zeros at the right end of the decimal to make a deciaml number up to x decimal places.

Example 1:

precision(10.2, 9)

will return

10.200000000 (up to 9 decimal points)

Example 2:

precision(10.2231, 2)

will return

10.22 (up to two decimal points)

Java - Get a list of all Classes loaded in the JVM

There are multiple answers to this question, partly due to ambiguous question - the title is talking about classes loaded by the JVM, whereas the contents of the question says "may or may not be loaded by the JVM".

Assuming that OP needs classes that are loaded by the JVM by a given classloader, and only those classes - my need as well - there is a solution (elaborated here) that goes like this:

import java.net.URL;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Vector;

public class CPTest {

    private static Iterator list(ClassLoader CL)
        throws NoSuchFieldException, SecurityException,
        IllegalArgumentException, IllegalAccessException {
        Class CL_class = CL.getClass();
        while (CL_class != java.lang.ClassLoader.class) {
            CL_class = CL_class.getSuperclass();
        }
        java.lang.reflect.Field ClassLoader_classes_field = CL_class
                .getDeclaredField("classes");
        ClassLoader_classes_field.setAccessible(true);
        Vector classes = (Vector) ClassLoader_classes_field.get(CL);
        return classes.iterator();
    }

    public static void main(String args[]) throws Exception {
        ClassLoader myCL = Thread.currentThread().getContextClassLoader();
        while (myCL != null) {
            System.out.println("ClassLoader: " + myCL);
            for (Iterator iter = list(myCL); iter.hasNext();) {
                System.out.println("\t" + iter.next());
            }
            myCL = myCL.getParent();
        }
    }

}

One of the neat things about it is that you can choose an arbitrary classloader you want to check. It is however likely to break should internals of classloader class change, so it is to be used as one-off diagnostic tool.

How to remove text before | character in notepad++

Please use regex to remove anything before |

example

dsfdf | fdfsfsf
dsdss|gfghhghg
dsdsds |dfdsfsds

Use find and replace in notepad++

find: .+(\|) replace: \1

output

| fdfsfsf
|gfghhghg
|dfdsfsds

How do I change the database name using MySQL?

Another way to rename the database or taking an image of the database is by using the reverse engineering option in the database tab. It will create an ER diagram for the database. Rename the schema there.

After that, go to the File menu and go to export and forward engineer the database.

Then you can import the database.

How can I find last row that contains data in a specific column?

You should use the .End(xlup) but instead of using 65536 you might want to use:

sheetvar.Rows.Count

That way it works for Excel 2007 which I believe has more than 65536 rows

Printing Lists as Tabular Data

There are some light and useful python packages for this purpose:

1. tabulate: https://pypi.python.org/pypi/tabulate

from tabulate import tabulate
print(tabulate([['Alice', 24], ['Bob', 19]], headers=['Name', 'Age']))

Name      Age
------  -----
Alice      24
Bob        19

tabulate has many options to specify headers and table format.

print(tabulate([['Alice', 24], ['Bob', 19]], headers=['Name', 'Age'], tablefmt='orgtbl'))

| Name   |   Age |
|--------+-------|
| Alice  |    24 |
| Bob    |    19 |

2. PrettyTable: https://pypi.python.org/pypi/PrettyTable

from prettytable import PrettyTable
t = PrettyTable(['Name', 'Age'])
t.add_row(['Alice', 24])
t.add_row(['Bob', 19])
print(t)

+-------+-----+
|  Name | Age |
+-------+-----+
| Alice |  24 |
|  Bob  |  19 |
+-------+-----+

PrettyTable has options to read data from csv, html, sql database. Also you are able to select subset of data, sort table and change table styles.

3. texttable: https://pypi.python.org/pypi/texttable

from texttable import Texttable
t = Texttable()
t.add_rows([['Name', 'Age'], ['Alice', 24], ['Bob', 19]])
print(t.draw())

+-------+-----+
| Name  | Age |
+=======+=====+
| Alice | 24  |
+-------+-----+
| Bob   | 19  |
+-------+-----+

with texttable you can control horizontal/vertical align, border style and data types.

4. termtables: https://github.com/nschloe/termtables

import termtables as tt

string = tt.to_string(
    [["Alice", 24], ["Bob", 19]],
    header=["Name", "Age"],
    style=tt.styles.ascii_thin_double,
    # alignment="ll",
    # padding=(0, 1),
)
print(string)

+-------+-----+
| Name  | Age |
+=======+=====+
| Alice | 24  |
+-------+-----+
| Bob   | 19  |
+-------+-----+

with texttable you can control horizontal/vertical align, border style and data types.

Other options:

terminaltables Easily draw tables in terminal/console applications from a list of lists of strings. Supports multi-line rows.
asciitable Asciitable can read and write a wide range of ASCII table formats via built-in Extension Reader Classes.

How do I disable orientation change on Android?

In the AndroidManifest.xml file, for each activity you want to lock add the last screenOrientation line:

android:label="@string/app_name"
android:name=".Login"
android:screenOrientation="portrait" >

Or android:screenOrientation="landscape".

Make Error 127 when running trying to compile code

Error 127 means one of two things:

file not found: the path you're using is incorrect. double check that the program is actually in your $PATH, or in this case, the relative path is correct -- remember that the current working directory for a random terminal might not be the same for the IDE you're using. it might be better to just use an absolute path instead.
ldso is not found: you're using a pre-compiled binary and it wants an interpreter that isn't on your system. maybe you're using an x86_64 (64-bit) distro, but the prebuilt is for x86 (32-bit). you can determine whether this is the answer by opening a terminal and attempting to execute it directly. or by running file -L on /bin/sh (to get your default/native format) and on the compiler itself (to see what format it is).

if the problem is (2), then you can solve it in a few diff ways:

get a better binary. talk to the vendor that gave you the toolchain and ask them for one that doesn't suck.
see if your distro can install the multilib set of files. most x86_64 64-bit distros allow you to install x86 32-bit libraries in parallel.
build your own cross-compiler using something like crosstool-ng.
you could switch between an x86_64 & x86 install, but that seems a bit drastic ;).

postgresql - replace all instances of a string within text field

Here is an example that replaces all instances of 1 or more white space characters in a column with an underscore using regular expression -

select distinct on (pd)
regexp_replace(rndc.pd, '\\s+', '_','g') as pd
from rndc14_ndc_mstr rndc;

Auto margins don't center image in page

there is a alternative to margin-left:auto; margin-right: auto; or margin:0 auto; for the ones that use position:absolute; this is how:
you set the left position of the element to 50% (left:50%;) but that will not center it correctly in order for the element to be centered correctly you need to give it a margin of minus half of it`s width, that will center your element perfectly

here is an example: http://jsfiddle.net/35ERq/3/

Where to change the value of lower_case_table_names=2 on windows xampp

Try adding/editing lower_case_table_names = 2 in my.ini or my.cnf

Python idiom to return first item or None

my_list[0] if len(my_list) else None

Get date from input form within PHP

    <?php
if (isset($_POST['birthdate'])) {
    $timestamp = strtotime($_POST['birthdate']); 
    $date=date('d',$timestamp);
    $month=date('m',$timestamp);
    $year=date('Y',$timestamp);
}
?>

Capturing image from webcam in java?

I used Webcam Capture API...u can download from this http://webcam-capture.sarxos.pl/

        webcam = Webcam.getDefault();
        webcam.open();

        if (webcam.isOpen()) { //if web cam open 
            BufferedImage image = webcam.getImage();
            JLabel imageLbl = new JLabel();
            imageLbl.setSize(640, 480);             //show captured image
            imageLbl.setIcon(new ImageIcon(image));

            int showConfirmDialog = JOptionPane.showConfirmDialog(null, imageLbl, "Image Viewer", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, new ImageIcon(""));

            if (showConfirmDialog == JOptionPane.YES_OPTION) {
                JFileChooser chooser = new JFileChooser();
                chooser.setDialogTitle("Save Image");
                chooser.setFileFilter(new FileNameExtensionFilter("IMAGES ONLY", "png", "jpeg", "jpg")); //this file extentions are shown
                int showSaveDialog = chooser.showSaveDialog(this);
                if (showSaveDialog == 0) {                  //if pressed 'Save' button
                    String filePath = chooser.getCurrentDirectory().toString().replace("\\", "/");
                    String fileName = chooser.getSelectedFile().getName(); //get user entered file name to save
                    ImageIO.write(image, "PNG", new File(filePath + "/" + fileName + ".png"));

                }
            }
        }

How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly?

def nans(df): return df[df.isnull().any(axis=1)]

then when ever you need it you can type:

nans(your_dataframe)

JAVA How to remove trailing zeros from a double

Use DecimalFormat

  double answer = 5.0;
   DecimalFormat df = new DecimalFormat("###.#");
  System.out.println(df.format(answer));

Encoding as Base64 in Java

Apache Commons has a nice implementation of Base64. You can do this as simply as:

// Encrypt data on your side using BASE64
byte[] bytesEncoded = Base64.encodeBase64(str .getBytes());
System.out.println("ecncoded value is " + new String(bytesEncoded));

// Decrypt data on other side, by processing encoded data
byte[] valueDecoded= Base64.decodeBase64(bytesEncoded );
System.out.println("Decoded value is " + new String(valueDecoded));

You can find more details about base64 encoding at Base64 encoding using Java and JavaScript.

fork: retry: Resource temporarily unavailable

This is commonly caused by running out of file descriptors.

There is the systems total file descriptor limit, what do you get from the command:

sysctl fs.file-nr

This returns counts of file descriptors:

<in_use> <unused_but_allocated> <maximum>

To find out what a users file descriptor limit is run the commands:

sudo su - <username>
ulimit -Hn

To find out how many file descriptors are in use by a user run the command:

sudo lsof -u <username> 2>/dev/null | wc -l

So now if you are having a system file descriptor limit issue you will need to edit your /etc/sysctl.conf file and add, or modify it it already exists, a line with fs.file-max and set it to a value large enough to deal with the number of file descriptors you need and reboot.

fs.file-max = 204708

How do you synchronise projects to GitHub with Android Studio?

In Android Studio 0.8.2 , you have the same option (ie Share on GitHub). If you want to find it, you can use ctrl+shift+a and enter github in the input text.

How can I hide/show a div when a button is clicked?

The following solution is:

briefest. Somewhat similar to here. It's also minimal: The table in the DIV is orthogonal to your question.
fastest: getElementById is called once at the outset. This may or may not suit your purposes.
It uses pure JavaScript (i.e. without JQuery).
It uses a button. Your taste may vary.
extensible: it's ready to add more DIVs, sharing the code.

_x000D_

mydiv = document.getElementById("showmehideme");_x000D_
_x000D_
function showhide(d) {_x000D_
    d.style.display = (d.style.display !== "none") ? "none" : "block";_x000D_
}

_x000D_

#mydiv { background-color: #ddd; }

_x000D_

<button id="button" onclick="showhide(mydiv)">Show/Hide</button>_x000D_
<div id="showmehideme">_x000D_
    This div will show and hide on button click._x000D_
</div>

_x000D_

Dropping connected users in Oracle database

Do a query:

SELECT * FROM v$session s;

Find your user and do the next query (with appropriate parameters):

ALTER SYSTEM KILL SESSION '<SID>, <SERIAL>';

DIVs inside another DIV inside another DIV with CSS

How to Correctly handle Weak Self in Swift Blocks with Arguments

[Closure and strong reference cycles]

As you know Swift's closure can capture the instance. It means that you are able to use self inside a closure. Especially escaping closure^[About] can create a strong reference cycle^[About]. By the way you have to explicitly use self inside escaping closure.

Swift closure has Capture List feature which allows you to avoid such situation and break a reference cycle because do not have a strong reference to captured instance. Capture List element is a pair of weak/unowned and a reference to class or variable.

For example

class A {
    private var completionHandler: (() -> Void)!
    private var completionHandler2: ((String) -> Bool)!
    
    func nonescapingClosure(completionHandler: () -> Void) {
        print("Hello World")
    }
    
    func escapingClosure(completionHandler: @escaping () -> Void) {
        self.completionHandler = completionHandler
    }
    
    func escapingClosureWithPArameter(completionHandler: @escaping (String) -> Bool) {
        self.completionHandler2 = completionHandler
    }
}

class B {
    var variable = "Var"
    
    func foo() {
        let a = A()
        
        //nonescapingClosure
        a.nonescapingClosure {
            variable = "nonescapingClosure"
        }
        
        //escapingClosure
        //strong reference cycle
        a.escapingClosure {
            self.variable = "escapingClosure"
        }
        
        //Capture List - [weak self]
        a.escapingClosure {[weak self] in
            self?.variable = "escapingClosure"
        }
        
        //Capture List - [unowned self]
        a.escapingClosure {[unowned self] in
            self.variable = "escapingClosure"
        }
        
        //escapingClosureWithPArameter
        a.escapingClosureWithPArameter { [weak self] (str) -> Bool in
            self?.variable = "escapingClosureWithPArameter"
            return true
        }
    }
}

weak - more preferable, use it when it is possible
unowned - use it when you are sure that lifetime of instance owner is bigger than closure

[weak vs unowned]

How to get the difference between two arrays of objects in JavaScript

JavaScript has Maps, that provide O(1) insertion and lookup time. Therefore this can be solved in O(n) (and not O(n²) as all the other answers do). For that, it is necessary to generate a unique primitive (string / number) key for each object. One could JSON.stringify, but that's quite error prone as the order of elements could influence equality:

 JSON.stringify({ a: 1, b: 2 }) !== JSON.stringify({ b: 2, a: 1 })

Therefore, I'd take a delimiter that does not appear in any of the values and compose a string manually:

const toHash = value => value.value + "@" + value.display;

Then a Map gets created. When an element exists already in the Map, it gets removed, otherwise it gets added. Therefore only the elements that are included odd times (meaning only once) remain. This will only work if the elements are unique in each array:

const entries = new Map();

for(const el of [...firstArray, ...secondArray]) {
  const key = toHash(el);
  if(entries.has(key)) {
    entries.delete(key);
  } else {
    entries.set(key, el);
  }
}

const result = [...entries.values()];

_x000D_

const firstArray = [_x000D_
    { value: "0", display: "Jamsheer" },_x000D_
    { value: "1", display: "Muhammed" },_x000D_
    { value: "2", display: "Ravi" },_x000D_
    { value: "3", display: "Ajmal" },_x000D_
    { value: "4", display: "Ryan" }_x000D_
]_x000D_
_x000D_
const secondArray = [_x000D_
    { value: "0", display: "Jamsheer" },_x000D_
    { value: "1", display: "Muhammed" },_x000D_
    { value: "2", display: "Ravi" },_x000D_
    { value: "3", display: "Ajmal" },_x000D_
];_x000D_
_x000D_
const toHash = value => value.value + "@" + value.display;_x000D_
_x000D_
const entries = new Map();_x000D_
_x000D_
for(const el of [...firstArray, ...secondArray]) {_x000D_
  const key = toHash(el);_x000D_
  if(entries.has(key)) {_x000D_
    entries.delete(key);_x000D_
  } else {_x000D_
    entries.set(key, el);_x000D_
  }_x000D_
}_x000D_
  _x000D_
const result = [...entries.values()];_x000D_
_x000D_
console.log(result);

_x000D_

Programs & Examples On #Tcldevkit

Cannot use string offset as an array in php

Java Webservice Client (Best way)

Converting Secret Key into a String and Vice Versa

For Java 8

For Java 7 and before (including Android):

How do I remove a single breakpoint with GDB?

How to define partitioning of DataFrame?

SQL exclude a column using SELECT * [except columnA] FROM tableA?

Facebook page automatic "like" URL (for QR Code)

Scroll to element on click in Angular 4

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.htaccess redirect http to https

How do I login and authenticate to Postgresql after a fresh install?

Sidenote: the postgres user

Get unicode value of a character

Open files in 'rt' and 'wt' modes

How to Ping External IP from Java Android

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How does one Display a Hyperlink in React Native App?

Bootstrap collapse animation not smooth

Set Locale programmatically

Update date + one year in mysql

How can I find where I will be redirected using cURL?

jQuery has deprecated synchronous XMLHTTPRequest

How to break out of the IF statement

MySQL Results as comma separated list

iOS 10 - Changes in asking permissions of Camera, microphone and Photo Library causing application to crash

Update 2019:

How to define static property in TypeScript interface

ORA-01652: unable to extend temp segment by 128 in tablespace SYSTEM: How to extend?

How to fully clean bin and obj folders within Visual Studio?

How can I remove a key and its value from an associative array?

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SQL Server : check if variable is Empty or NULL for WHERE clause

Parsing ISO 8601 date in Javascript

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Force unmount of NFS-mounted directory

Android: ProgressDialog.show() crashes with getApplicationContext

Get the last three chars from any string - Java

Unable to create Android Virtual Device

Best way to store data locally in .NET (C#)

Java SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'") gives timezone as IST

tl;dr

ISO 8601

java.time

How many spaces will Java String.trim() remove?

Breaking a list into multiple columns in Latex

Set div height equal to screen size

file path Windows format to java format

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Changing PowerShell's default output encoding to UTF-8

Programmatically create a UIView with color gradient

How to embed images in html email

Conditionally change img src based on model data

Clicking the back button twice to exit an activity

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Hide text using css

How to get build time stamp from Jenkins build variables?

Status bar and navigation bar appear over my view's bounds in iOS 7

How to setup Tomcat server in Netbeans?

iptables LOG and DROP in one rule

Should I use the Reply-To header when sending emails as a service to others?

When should I use a struct rather than a class in C#?

Java - How to find the redirected url of a url?

Split string in Lua?

Asynchronous Requests with Python requests

Note

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What is FCM token in Firebase?

Access non-numeric Object properties by index?

Android: Get checked checkbox values

MySQL query finding values in a comma separated string

How can I get the full object in Node.js's console.log(), rather than '[Object]'?

send mail to multiple receiver with HTML mailto

Pythonic way to combine FOR loop and IF statement

Passing parameters in rails redirect_to

Matching special characters and letters in regex

Sidenote: the `postgres` user

Other answers don't mention this command is named `workbench.action.quickOpen`.