#Meta | Programs & Examples on Meta

What is "X-Content-Type-Options=nosniff"?

Description

Setting a server's X-Content-Type-Options HTTP response header to nosniff instructs browsers to disable content or MIME sniffing which is used to override response Content-Type headers to guess and process the data using an implicit content type. While this can be convenient in some scenarios, it can also lead to some attacks listed below. Configuring your server to return the X-Content-Type-Options HTTP response header set to nosniff will instruct browsers that support MIME sniffing to use the server-provided Content-Type and not interpret the content as a different content type.

Browser Support

The X-Content-Type-Options HTTP response header is supported in Chrome, Firefox and Edge as well as other browsers. The latest browser support is available on the Mozilla Developer Network (MDN) Browser Compatibility Table for X-Content-Type-Options:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options

Attacks Countered

MIME Confusion Attack enables attacks via user generated content sites by allowing users uploading malicious code that is then executed by browsers which will interpret the files using alternate content types, e.g. implicit application/javascript vs. explicit text/plain. This can result in a "drive-by download" attack which is a common attack vector for phishing. Sites that host user generated content should use this header to protect their users. This is mentioned by VeraCode and OWASP which says the following:

This reduces exposure to drive-by download attacks and sites serving user uploaded content that, by clever naming, could be treated by MSIE as executable or dynamic HTML files.
Unauthorized Hotlinking can also be enabled by Content-Type sniffing. By hotlinking to sites with resources for one purpose, e.g. viewing, apps can rely on content-type sniffing and generate a lot of traffic on sites for another purpose where it may be against their terms of service, e.g. GitHub displays JavaScript code for viewing, but not for execution:

Some pesky non-human users (namely computers) have taken to "hotlinking" assets via the raw view feature -- using the raw URL as the src for a <script> or <img> tag. The problem is that these are not static assets. The raw file view, like any other view in a Rails app, must be rendered before being returned to the user. This quickly adds up to a big toll on performance. In the past we've been forced to block popular content served this way because it put excessive strain on our servers.

How to use the 'og' (Open Graph) meta tag for Facebook share

Facebook uses what's called the Open Graph Protocol to decide what things to display when you share a link. The OGP looks at your page and tries to decide what content to show. We can lend a hand and actually tell Facebook what to take from our page.

The way we do that is with og:meta tags.

The tags look something like this -

  <meta property="og:title" content="Stuffed Cookies" />
  <meta property="og:image" content="http://fbwerks.com:8000/zhen/cookie.jpg" />
  <meta property="og:description" content="The Turducken of Cookies" />
  <meta property="og:url" content="http://fbwerks.com:8000/zhen/cookie.html">

You'll need to place these or similar meta tags in the <head> of your HTML file. Don't forget to substitute the values for your own!

For more information you can read all about how Facebook uses these meta tags in their documentation. Here is one of the tutorials from there - https://developers.facebook.com/docs/opengraph/tutorial/

Facebook gives us a great little tool to help us when dealing with these meta tags - you can use the Debugger to see how Facebook sees your URL, and it'll even tell you if there are problems with it.

One thing to note here is that every time you make a change to the meta tags, you'll need to feed the URL through the Debugger again so that Facebook will clear all the data that is cached on their servers about your URL.

Redirect from an HTML page

You don't need any JavaScript code for this. Write this in the <head> section of the HTML page:

<meta http-equiv="refresh" content="0; url=example.com" />

As soon as the page loads at 0 seconds, you can go to your page.

window.location (JS) vs header() (PHP) for redirection

The result is same for all options. Redirect.

<meta> in HTML:

Show content of your site, and next redirect user after a few (or 0) seconds.
Don't need JavaScript enabled.
Don't need PHP.

window.location in JS:

Javascript enabled needed.
Don't need PHP.
Show content of your site, and next redirect user after a few (or 0) seconds.
Redirect can be dependent on any conditions if (1 === 1) { window.location.href = 'http://example.com'; }.

header('Location:') in PHP:

Don't need JavaScript enabled.
PHP needed.
Redirect will be executed first, user never see what is after. header() must be the first command in php script, before output any other. If you try output some before header, will receive an Warning: Cannot modify header information - headers already sent

Auto refresh code in HTML using meta tags

It looks like you probably pasted this (or used a word processor like MS Word) using a kind of double-quotes that are not recognized by the browser. Please check that your code uses actual double-quotes like this one ", which is different from the following character: ”

Replace the meta tag with this one and try again:

<meta http-equiv="refresh" content="5" >

How can I get client information such as OS and browser

Your best bet is User-Agent header. You can get it like this in JSP or Servlet,

String userAgent = request.getHeader("User-Agent");

The header looks like this,

User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.13) Gecko/2009073021 Firefox/3.0.13

It provides detailed information on browser. However, it's pretty much free format so it's very hard to decipher every single one. You just need to figure out which browsers you will support and write parser for each one. When you try to identify the version of browser, always check newer version first. For example, IE6 user-agent may contain IE5 for backward compatibility. If you check IE5 first, IE6 will be categorized as IE5 also.

You can get a full list of all user-agent values from this web site,

http://www.user-agents.org/

With User-Agent, you can tell the exact version of the browser. You can get a pretty good idea on OS but you may not be able to distinguish between different versions of the same OS, for example, Windows NT and 2000 may use same User-Agent.

There is nothing about resolution. However, you can get this with Javascript on an AJAX call.

Getting title and meta tags from external website

get_meta_tags will help you with all but the title. To get the title just use a regex.

$url = 'http://some.url.com';
preg_match("/<title>(.+)<\/title>/siU", file_get_contents($url), $matches);
$title = $matches[1];

Hope that helps.

How do I get a plist as a Dictionary in Swift?

Here's the solution I found:

let levelBlocks = NSDictionary(contentsOfFile: NSBundle.mainBundle().pathForResource("LevelBlocks", ofType: "plist"))
let test: AnyObject = levelBlocks.objectForKey("Level1")
println(test) // Prints the value of test

I set the type of test to AnyObject to silence a warning about an unexpected inference that could occur.

Also, it has to be done in a class method.

To access and save a specific value of a known type:

let value = levelBlocks.objectForKey("Level1").objectForKey("amount") as Int
println(toString(value)) // Converts value to String and prints it

TypeError: 'NoneType' object has no attribute 'getitem'

move.CompleteMove() does not return a value (perhaps it just prints something). Any method that does not return a value returns None, and you have assigned None to self.values.

Here is an example of this:

>>> def hello(x):
...    print x*2
...
>>> hello('world')
worldworld
>>> y = hello('world')
worldworld
>>> y
>>>

You'll note y doesn't print anything, because its None (the only value that doesn't print anything on the interactive prompt).

How can I add C++11 support to Code::Blocks compiler?

The answer with screenshots (put the checkbox as in the second pic, then press OK):

Uninstall all installed gems, in OSX?

Rubygems >= 2.1.0

gem uninstall -aIx

a removes all versions
I ignores dependencies
x includes executables

Rubgems < 2.1.0

for i in `gem list --no-versions`; do gem uninstall -aIx $i; done

How to perform a for loop on each character in a string in Bash?

TEXT="hello world"
for i in {1..${#TEXT}}; do
   echo ${TEXT[i]}
done

where {1..N} is an inclusive range

${#TEXT} is a number of letters in a string

${TEXT[i]} - you can get char from string like an item from an array

The import org.junit cannot be resolved

you need to add Junit dependency in pom.xml file, it means you need to update with latest version.

<dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>

How to convert hex string to Java string?

First of all read in the data, then convert it to byte array:

 byte b = Byte.parseByte(str, 16);

and then use String constructor:

new String(byte[] bytes)

or if the charset is not system default then:

new String(byte[] bytes, String charsetName)

How to return an array from a function?

"how can i return a array in a c++ method and how must i declare it? int[] test(void); ??"

template <class X>
  class Array
{
  X     *m_data;
  int    m_size;
public:
    // there constructor, destructor, some methods
    int Get(X* &_null_pointer)
    {
        if(!_null_pointer)
        {
            _null_pointer = new X [m_size];
            memcpy(_null_pointer, m_data, m_size * sizeof(X));
            return m_size;
        }
       return 0;
    }
};

just for int

class IntArray
{
  int   *m_data;
  int    m_size;
public:
    // there constructor, destructor, some methods
    int Get(int* &_null_pointer)
    {
        if(!_null_pointer)
        {
            _null_pointer = new int [m_size];
            memcpy(_null_pointer, m_data, m_size * sizeof(int));
            return m_size;
        }
       return 0;
    }
};

example

Array<float> array;
float  *n_data = NULL;
int     data_size;
if(data_size = array.Get(n_data))
{     // work with array    }

delete [] n_data;

example for int

IntArray   array;
int       *n_data = NULL;
int        data_size;
if(data_size = array.Get(n_data))
{  // work with array  }

delete [] n_data;

Convert date to UTC using moment.js

This moment.utc(stringDate, format).toDate() worked for me.

This ~~moment.utc(date).toDate()~~ not.

wait() or sleep() function in jquery?

delay() will not do the job. The problem with delay() is it's part of the animation system, and only applies to animation queues.

What if you want to wait before executing something outside of animation??

Use this:

window.setTimeout(function(){
                 // do whatever you want to do     
                  }, 600);

What happens?: In this scenario it waits 600 miliseconds before executing the code specified within the curly braces.

This helped me a great deal once I figured it out and hope it will help you as well!

IMPORTANT NOTICE: 'window.setTimeout' happens asynchronously. Keep that in mind when writing your code!

How do I execute a command and get the output of the command within C++ using POSIX?

I'd use popen() (++waqas).

But sometimes you need reading and writing...

It seems like nobody does things the hard way any more.

(Assuming a Unix/Linux/Mac environment, or perhaps Windows with a POSIX compatibility layer...)

enum PIPE_FILE_DESCRIPTERS
{
  READ_FD  = 0,
  WRITE_FD = 1
};

enum CONSTANTS
{
  BUFFER_SIZE = 100
};

int
main()
{
  int       parentToChild[2];
  int       childToParent[2];
  pid_t     pid;
  string    dataReadFromChild;
  char      buffer[BUFFER_SIZE + 1];
  ssize_t   readResult;
  int       status;

  ASSERT_IS(0, pipe(parentToChild));
  ASSERT_IS(0, pipe(childToParent));

  switch (pid = fork())
  {
    case -1:
      FAIL("Fork failed");
      exit(-1);

    case 0: /* Child */
      ASSERT_NOT(-1, dup2(parentToChild[READ_FD], STDIN_FILENO));
      ASSERT_NOT(-1, dup2(childToParent[WRITE_FD], STDOUT_FILENO));
      ASSERT_NOT(-1, dup2(childToParent[WRITE_FD], STDERR_FILENO));
      ASSERT_IS(0, close(parentToChild [WRITE_FD]));
      ASSERT_IS(0, close(childToParent [READ_FD]));

      /*     file, arg0, arg1,  arg2 */
      execlp("ls", "ls", "-al", "--color");

      FAIL("This line should never be reached!!!");
      exit(-1);

    default: /* Parent */
      cout << "Child " << pid << " process running..." << endl;

      ASSERT_IS(0, close(parentToChild [READ_FD]));
      ASSERT_IS(0, close(childToParent [WRITE_FD]));

      while (true)
      {
        switch (readResult = read(childToParent[READ_FD],
                                  buffer, BUFFER_SIZE))
        {
          case 0: /* End-of-File, or non-blocking read. */
            cout << "End of file reached..."         << endl
                 << "Data received was ("
                 << dataReadFromChild.size() << "): " << endl
                 << dataReadFromChild                << endl;

            ASSERT_IS(pid, waitpid(pid, & status, 0));

            cout << endl
                 << "Child exit staus is:  " << WEXITSTATUS(status) << endl
                 << endl;

            exit(0);


          case -1:
            if ((errno == EINTR) || (errno == EAGAIN))
            {
              errno = 0;
              break;
            }
            else
            {
              FAIL("read() failed");
              exit(-1);
            }

          default:
            dataReadFromChild . append(buffer, readResult);
            break;
        }
      } /* while (true) */
  } /* switch (pid = fork())*/
}

You also might want to play around with select() and non-blocking reads.

fd_set          readfds;
struct timeval  timeout;

timeout.tv_sec  = 0;    /* Seconds */
timeout.tv_usec = 1000; /* Microseconds */

FD_ZERO(&readfds);
FD_SET(childToParent[READ_FD], &readfds);

switch (select (1 + childToParent[READ_FD], &readfds, (fd_set*)NULL, (fd_set*)NULL, & timeout))
{
  case 0: /* Timeout expired */
    break;

  case -1:
    if ((errno == EINTR) || (errno == EAGAIN))
    {
      errno = 0;
      break;
    }
    else
    {
      FAIL("Select() Failed");
      exit(-1);
    }

  case 1:  /* We have input */
    readResult = read(childToParent[READ_FD], buffer, BUFFER_SIZE);
    // However you want to handle it...
    break;

  default:
    FAIL("How did we see input on more than one file descriptor?");
    exit(-1);
}

Spring Data: "delete by" is supported?

Deprecated answer (Spring Data JPA <=1.6.x):

@Modifying annotation to the rescue. You will need to provide your custom SQL behaviour though.

public interface UserRepository extends JpaRepository<User, Long> {
    @Modifying
    @Query("delete from User u where u.firstName = ?1")
    void deleteUsersByFirstName(String firstName);
}

Update:

In modern versions of Spring Data JPA (>=1.7.x) query derivation for delete, remove and count operations is accessible.

public interface UserRepository extends CrudRepository<User, Long> {

    Long countByFirstName(String firstName);

    Long deleteByFirstName(String firstName);

    List<User> removeByFirstName(String firstName);

}

Ruby 'require' error: cannot load such file

Ruby 1.9 has removed the current directory from the load path, and so you will need to do a relative require on this file, as David Grayson says:

require_relative 'tokenizer'

There's no need to suffix it with .rb, as Ruby's smart enough to know that's what you mean anyway.

Detect if HTML5 Video element is playing

I just added that to the media object manually

let media = document.querySelector('.my-video');
media.isplaying = false;

...

if(media.isplaying) //do something

Then just toggle it when i hit play or pause.

Decoding JSON String in Java

Instead of downloading separate java files as suggested by Veer, you could just add this JAR file to your package.

To add the jar file to your project in Eclipse, do the following:

Right click on your project, click Build Path > Configure Build Path
Goto Libraries tab > Add External JARs
Locate the JAR file and add

Check if an element is present in a Bash array

You could do:

if [[ " ${arr[*]} " == *" d "* ]]; then
    echo "arr contains d"
fi

This will give false positives for example if you look for "a b" -- that substring is in the joined string but not as an array element. This dilemma will occur for whatever delimiter you choose.

The safest way is to loop over the array until you find the element:

array_contains () {
    local seeking=$1; shift
    local in=1
    for element; do
        if [[ $element == "$seeking" ]]; then
            in=0
            break
        fi
    done
    return $in
}

arr=(a b c "d e" f g)
array_contains "a b" "${arr[@]}" && echo yes || echo no    # no
array_contains "d e" "${arr[@]}" && echo yes || echo no    # yes

Here's a "cleaner" version where you just pass the array name, not all its elements

array_contains2 () { 
    local array="$1[@]"
    local seeking=$2
    local in=1
    for element in "${!array}"; do
        if [[ $element == "$seeking" ]]; then
            in=0
            break
        fi
    done
    return $in
}

array_contains2 arr "a b"  && echo yes || echo no    # no
array_contains2 arr "d e"  && echo yes || echo no    # yes

For associative arrays, there's a very tidy way to test if the array contains a given key: The -v operator

$ declare -A arr=( [foo]=bar [baz]=qux )
$ [[ -v arr[foo] ]] && echo yes || echo no
yes
$ [[ -v arr[bar] ]] && echo yes || echo no
no

See 6.4 Bash Conditional Expressions in the manual.

How can I setup & run PhantomJS on Ubuntu?

For Ubuntu, download the suitable file from http://phantomjs.org/download.html. CD to the downloaded folder. Then:

sudo tar xvf phantomjs-1.9.0-linux-x86_64.tar.bz2
sudo mv phantomjs-1.9.0-linux-x86_64 /usr/local/share/phantomjs
sudo ln -s /usr/local/share/phantomjs/bin/phantomjs /usr/bin/phantomjs

Make sure to replace the file name in these commands with the file you have downloaded.

How do I add the contents of an iterable to a set?

Use list comprehension.

Short circuiting the creation of iterable using a list for example :)

>>> x = [1, 2, 3, 4]
>>> 
>>> k = x.__iter__()
>>> k
<listiterator object at 0x100517490>
>>> l = [y for y in k]
>>> l
[1, 2, 3, 4]
>>> 
>>> z = Set([1,2])
>>> z.update(l)
>>> z
set([1, 2, 3, 4])
>>>

[Edit: missed the set part of question]

Is it possible to import a whole directory in sass using @import?

You might want to retain source order then you can just use this.

@import
  'foo',
  'bar';

I prefer this.

Rails: FATAL - Peer authentication failed for user (PG::Error)

This is the most foolproof way to get your rails app working with postgres in the development environment in Ubuntu 13.10.

1) Create rails app with postgres YAML and 'pg' gem in the Gemfile:

$ rails new my_application -d postgresql

2) Give it some CRUD functionality. If you're just seeing if postgres works, create a scaffold:

$ rails g scaffold cats name:string age:integer colour:string

3) As of rails 4.0.1 the -d postgresql option generates a YAML that doesn't include a host parameter. I found I needed this. Edit the development section and create the following parameters:

encoding: UTF-8
host: localhost
database: my_application_development
username: thisismynewusername
password: thisismynewpassword

Note the database parameter is for a database that doesn't exit yet, and the username and password are credentials for a role that doesn't exist either. We'll create those later on!

This is how config/database.yml should look (no shame in copypasting :D ):

development:
  adapter: postgresql
  pool: 5
  # these are our new parameters
  encoding: UTF-8
  database: my_application_development
  host: localhost
  username: thisismynewusername
  password: thisismynewpassword

test:
  # this won't work 
  adapter: postgresql
  encoding: unicode
  database: my_application_test
  pool: 5
  username: my_application
  password:

production:
  # this won't work 
  adapter: postgresql
  encoding: unicode
  database: my_application_production
  pool: 5
  username: my_application
  password:

4) Start the postgres shell with this command:

$ psql

4a) You may get this error if your current user (as in your computer user) doesn't have a corresponding administration postgres role.

psql: FATAL:  role "your_username" does not exist

Now I've only installed postgres once, so I may be wrong here, but I think postgres automatically creates an administration role with the same credentials as the user you installed postgres as.

4b) So this means you need to change to the user that installed postgres to use the psql command and start the shell:

$ sudo su postgres

And then run

$ psql

5) You'll know you're in the postgres shell because your terminal will look like this:

$ psql
psql (9.1.10)
Type "help" for help.

postgres=#

6) Using the postgresql syntax, let's create the user we specified in config/database.yml's development section:

postgres=# CREATE ROLE thisismynewusername WITH LOGIN PASSWORD 'thisismynewpassword';

Now, there's some subtleties here so let's go over them.

The role's username, thisismynewusername, does not have quotes of any kind around it
Specify the keyword LOGIN after the WITH. If you don't, the role will still be created, but it won't be able to log in to the database!
The role's password, thisismynewpassword, needs to be in single quotes. Not double quotes.
Add a semi colon on the end ;)

You should see this in your terminal:

postgres=#
CREATE ROLE
postgres=#

That means, "ROLE CREATED", but postgres' alerts seem to adopt the same imperative conventions of git hub.

7) Now, still in the postgres shell, we need to create the database with the name we set in the YAML. Make the user we created in step 6 its owner:

postgres=# CREATE DATABASE my_application_development OWNER thisismynewusername;

You'll know if you were successful because you'll get the output:

CREATE DATABASE

8) Quit the postgres shell:

\q

9) Now the moment of truth:

$ RAILS_ENV=development rake db:migrate

If you get this:

==  CreateCats: migrating =================================================
-- create_table(:cats)
   -> 0.0028s
==  CreateCats: migrated (0.0028s) ========================================

Congratulations, postgres is working perfectly with your app.

9a) On my local machine, I kept getting a permission error. I can't remember it exactly, but it was an error along the lines of

Can't access the files. Change permissions to 666.

Though I'd advise thinking very carefully about recursively setting write privaledges on a production machine, locally, I gave my whole app read write privileges like this:

9b) Climb up one directory level:

$ cd ..

9c) Set the permissions of the my_application directory and all its contents to 666:

$ chmod -R 0666 my_application

9d) And run the migration again:

$ RAILS_ENV=development rake db:migrate

==  CreateCats: migrating =================================================
-- create_table(:cats)
   -> 0.0028s
==  CreateCats: migrated (0.0028s) ========================================

Some tips and tricks if you muck up

Try these before restarting all of these steps:

The mynewusername user doesn't have privileges to CRUD to the my_app_development database? Drop the database and create it again with mynewusername as the owner:

1) Start the postgres shell:

$ psql

2) Drop the my_app_development database. Be careful! Drop means utterly delete!

postgres=# DROP DATABASE my_app_development;

3) Recreate another my_app_development and make mynewusername the owner:

postgres=# CREATE DATABASE my_application_development OWNER mynewusername;

4) Quit the shell:

postgres=# \q

The mynewusername user can't log into the database? Think you wrote the wrong password in the YAML and can't quite remember the password you entered using the postgres shell? Simply alter the role with the YAML password:

1) Open up your YAML, and copy the password to your clipboard:

 development:
      adapter: postgresql
      pool: 5
      # these are our new parameters
      encoding: UTF-8
      database: my_application_development
      host: localhost
      username: thisismynewusername
      password: musthavebeenverydrunkwheniwrotethis

2) Start the postgres shell:

$ psql

3) Update mynewusername's password. Paste in the password, and remember to put single quotes around it:

postgres=# ALTER ROLE mynewusername PASSWORD `musthavebeenverydrunkwheniwrotethis`;

4) Quit the shell:

postgres=# \q

Trying to connect to localhost via a database viewer such as Dbeaver, and don't know what your postgres user's password is? Change it like this:

1) Run passwd as a superuser:

$ sudo passwd postgres

2) Enter your accounts password for sudo (nothing to do with postgres):

[sudo] password for starkers: myaccountpassword

3) Create the postgres account's new passwod:

Enter new UNIX password: databasesarefun
Retype new UNIX password: databasesarefun
passwd: password updated successfully

Getting this error message?:

Run `$ bin/rake db:create db:migrate` to create your database
$ rake db:create db:migrate
PG::InsufficientPrivilege: ERROR:  permission denied to create database

4) You need to give your user the ability to create databases. From the psql shell:

ALTER ROLE thisismynewusername WITH CREATEDB

Searching a string in eclipse workspace

Press Ctrl+shift+L and type your string

SQLite error 'attempt to write a readonly database' during insert?

For me the issue was SELinux enforcement rather than permissions. The "read only database" error went away once I disabled enforcement, following the suggestion made by Steve V. in a comment on the accepted answer.

echo 0 >/selinux/enforce

Upon running this command, everything worked as intended (CentOS 6.3).

The specific issue I had encountered was during setup of Graphite. I had triple-checked that the apache user owned and could write to both my graphite.db and its parent directory. But until I "fixed" SELinux, all I got was a stack trace to the effect of: DatabaseError: attempt to write a readonly database

How to import classes defined in init.py

Yes, it is possible. You might also want to define __all__ in __init__.py files. It's a list of modules that will be imported when you do

from lib import *

C++: Rounding up to the nearest multiple of a number

int roundUp(int numToRound, int multiple)
{
  return (multiple ? (((numToRound+multiple-1) / multiple) * multiple) : numToRound);
}

and for your ~/.bashrc:

roundup()
{
  echo $(( ${2} ? ((${1}+${2}-1)/${2})*${2} : ${1} ))
}

How are echo and print different in PHP?

I think print() is slower than echo.

I like to use print() only for situations like:

 echo 'Doing some stuff... ';
 foo() and print("ok.\n") or print("error: " . getError() . ".\n");

Single Form Hide on Startup

Override OnVisibleChanged in Form

protected override void OnVisibleChanged(EventArgs e)
{
    this.Visible = false;

    base.OnVisibleChanged(e);
}

You can add trigger if you may need to show it at some point

public partial class MainForm : Form
{
public bool hideForm = true;
...
public MainForm (bool hideForm)
    {
        this.hideForm = hideForm;
        InitializeComponent();
    }
...
protected override void OnVisibleChanged(EventArgs e)
    {
        if (this.hideForm)
            this.Visible = false;

        base.OnVisibleChanged(e);
    }
...
}

Comparison of full text search engine - Lucene, Sphinx, Postgresql, MySQL?

Just my two cents to this very old question. I would highly recommend taking a look at ElasticSearch.

Elasticsearch is a search server based on Lucene. It provides a distributed, multitenant-capable full-text search engine with a RESTful web interface and schema-free JSON documents. Elasticsearch is developed in Java and is released as open source under the terms of the Apache License.

The advantages over other FTS (full text search) Engines are:

RESTful interface
Better scalability
Large community
Built by Lucene developers
Extensive documentation
There are many open source libraries available (including Django)

We are using this search engine at our project and very happy with it.

m2e lifecycle-mapping not found

I was having the same issue, where:

No marketplace entries found to handle build-helper-maven-plugin:1.8:add-source in Eclipse. Please see Help for more information.

and clicking the Window > Preferences > Maven > Discovery > open catalog button would report no connection.

Updating from 7u40 to 7u45 on Centos 6.4 and OSX fixes the issue.

How do I make a burn down chart in Excel?

Say your data set is in Columns A and B of the first sheet.

On Insert ribbon, pick chart type as "Line with Markers"
Right-click on chart, "Select Data...". Select your data in columns without column labels, so your data range would be something like =Sheet1!$A$2:$B$5.
Profit! I mean you're done :-) You might want to change 'Series1' label Excel generates with an actual book name, you can do so in the above "Select Data" dialog.

You can do this with multiple books too - as long as their "pages remaining" data points are tracked on the same dates (e.g. Book2 data would be in Column C, etc...) Books will be represented by additional series.

Change URL parameters

You can use this my library to do the job: https://github.com/Mikhus/jsurl

var url = new Url('site.fwx?position=1&archiveid=5000&columns=5&rows=20&sorting=ModifiedTimeAsc');
url.query.rows = 10;
alert( url);

Android + Pair devices via bluetooth programmatically

Edit: I have just explained logic to pair here. If anybody want to go with the complete code then see my another answer. I have answered here for logic only but I was not able to explain properly, So I have added another answer in the same thread.

Try this to do pairing:

If you are able to search the devices then this would be your next step

ArrayList<BluetoothDevice> arrayListBluetoothDevices = NEW ArrayList<BluetoothDevice>;

I am assuming that you have the list of Bluetooth devices added in the arrayListBluetoothDevices:

BluetoothDevice bdDevice;
bdDevice = arrayListBluetoothDevices.get(PASS_THE_POSITION_TO_GET_THE_BLUETOOTH_DEVICE);

Boolean isBonded = false;
try {
isBonded = createBond(bdDevice);
if(isBonded)
{
    Log.i("Log","Paired");
}
} catch (Exception e) 
{
    e.printStackTrace(); 
}

The createBond() method:

public boolean createBond(BluetoothDevice btDevice)  
    throws Exception  
    { 
        Class class1 = Class.forName("android.bluetooth.BluetoothDevice");
        Method createBondMethod = class1.getMethod("createBond");  
        Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);  
        return returnValue.booleanValue();  
    }

Add this line into your Receiver in the ACTION_FOUND

if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                    mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
                    arrayListBluetoothDevices.add(device);
                }

Select first empty cell in column F starting from row 1. (without using offset )

Public Sub SelectFirstBlankCell()
    Dim sourceCol As Integer, rowCount As Integer, currentRow As Integer
    Dim currentRowValue As String

    sourceCol = 6   'column F has a value of 6
    rowCount = Cells(Rows.Count, sourceCol).End(xlUp).Row

    'for every row, find the first blank cell and select it
    For currentRow = 1 To rowCount
        currentRowValue = Cells(currentRow, sourceCol).Value
        If IsEmpty(currentRowValue) Or currentRowValue = "" Then
            Cells(currentRow, sourceCol).Select
        End If
    Next
End Sub

If any column contains more than one empty cell continuously then this code will not work properly

How to add to an existing hash in Ruby

If you have a hash, you can add items to it by referencing them by key:

hash = { }
hash[:a] = 'a'
hash[:a]
# => 'a'

Here, like [ ] creates an empty array, { } will create a empty hash.

Arrays have zero or more elements in a specific order, where elements may be duplicated. Hashes have zero or more elements organized by key, where keys may not be duplicated but the values stored in those positions can be.

Hashes in Ruby are very flexible and can have keys of nearly any type you can throw at it. This makes it different from the dictionary structures you find in other languages.

It's important to keep in mind that the specific nature of a key of a hash often matters:

hash = { :a => 'a' }

# Fetch with Symbol :a finds the right value
hash[:a]
# => 'a'

# Fetch with the String 'a' finds nothing
hash['a']
# => nil

# Assignment with the key :b adds a new entry
hash[:b] = 'Bee'

# This is then available immediately
hash[:b]
# => "Bee"

# The hash now contains both keys
hash
# => { :a => 'a', :b => 'Bee' }

Ruby on Rails confuses this somewhat by providing HashWithIndifferentAccess where it will convert freely between Symbol and String methods of addressing.

You can also index on nearly anything, including classes, numbers, or other Hashes.

hash = { Object => true, Hash => false }

hash[Object]
# => true

hash[Hash]
# => false

hash[Array]
# => nil

Hashes can be converted to Arrays and vice-versa:

# Like many things, Hash supports .to_a
{ :a => 'a' }.to_a
# => [[:a, "a"]]

# Hash also has a handy Hash[] method to create new hashes from arrays
Hash[[[:a, "a"]]]
# => {:a=>"a"}

When it comes to "inserting" things into a Hash you may do it one at a time, or use the merge method to combine hashes:

{ :a => 'a' }.merge(:b => 'b')
# {:a=>'a',:b=>'b'}

Note that this does not alter the original hash, but instead returns a new one. If you want to combine one hash into another, you can use the merge! method:

hash = { :a => 'a' }

# Returns the result of hash combined with a new hash, but does not alter
# the original hash.
hash.merge(:b => 'b')
# => {:a=>'a',:b=>'b'}

# Nothing has been altered in the original
hash
# => {:a=>'a'}

# Combine the two hashes and store the result in the original
hash.merge!(:b => 'b')
# => {:a=>'a',:b=>'b'}

# Hash has now been altered
hash
# => {:a=>'a',:b=>'b'}

Like many methods on String and Array, the ! indicates that it is an in-place operation.

What are the differences between LDAP and Active Directory?

Active directory is a directory service provider, where you can add new user to a directory, remove or modify, specify privilages, assign policy etc. Its just like a phone directory where every person have a unique contact number. Every thing in AD(Active Directory) are considered as Objects and every object is given a Unique ID.(similar to a unique contact number in a phone directory.

Ldap is a protocol specially designed for directory service providers. Windows server OS uses AD as a directory server, AIX which is a UNIX version by IBM uses Tivoli directory server. Both of them uses LDAP protocol for interacting with directory.

Apart from protocol there are LDAP servers, LDAP browsers too.

Convert milliseconds to date (in Excel)

Converting your value in milliseconds to days is simply (MsValue / 86,400,000)

We can get 1/1/1970 as numeric value by DATE(1970,1,1)

= (MsValueCellReference / 86400000) + DATE(1970,1,1)

Using your value of 1271664970687 and formatting it as dd/mm/yyyy hh:mm:ss gives me a date and time of 19/04/2010 08:16:11

How do you roll back (reset) a Git repository to a particular commit?

When you say the 'GUI Tool', I assume you're using Git For Windows.

IMPORTANT, I would highly recommend creating a new branch to do this on if you haven't already. That way your master can remain the same while you test out your changes.

With the GUI you need to 'roll back this commit' like you have with the history on the right of your view. Then you will notice you have all the unwanted files as changes to commit on the left. Now you need to right click on the grey title above all the uncommited files and select 'disregard changes'. This will set your files back to how they were in this version.

Makefiles with source files in different directories

I think it's better to point out that using Make (recursive or not) is something that usually you may want to avoid, because compared to today tools, it's difficult to learn, maintain and scale.

It's a wonderful tool but it's direct use should be considered obsolete in 2010+.

Unless, of course, you're working in a special environment i.e. with a legacy project etc.

Use an IDE, CMake or, if you're hard cored, the Autotools.

(edited due to downvotes, ty Honza for pointing out)

What's the best way to loop through a set of elements in JavaScript?

I think you have two alternatives. For dom elements such as jQuery and like frameworks give you a good method of iteration. The second approach is the for loop.

How to get thread id of a pthread in linux c program?

You can also write in this manner and it does the same. For eg:

for(int i=0;i < total; i++)
{
    pthread_join(pth[i],NULL);
    cout << "SUM of thread id " << pth[i] << " is " << args[i].sum << endl;
}

This program sets up an array of pthread_t and calculate sum on each. So it is printing the sum of each thread with thread id.

Keras input explanation: input_shape, units, batch_size, dim, etc

Input Dimension Clarified:

Not a direct answer, but I just realized the word Input Dimension could be confusing enough, so be wary:

It (the word dimension alone) can refer to:

a) The dimension of Input Data (or stream) such as # N of sensor axes to beam the time series signal, or RGB color channel (3): suggested word=> "InputStream Dimension"

b) The total number /length of Input Features (or Input layer) (28 x 28 = 784 for the MINST color image) or 3000 in the FFT transformed Spectrum Values, or

"Input Layer / Input Feature Dimension"

c) The dimensionality (# of dimension) of the input (typically 3D as expected in Keras LSTM) or (#RowofSamples, #of Senors, #of Values..) 3 is the answer.

"N Dimensionality of Input"

d) The SPECIFIC Input Shape (eg. (30,50,50,3) in this unwrapped input image data, or (30, 250, 3) if unwrapped Keras:

Keras has its input_dim refers to the Dimension of Input Layer / Number of Input Feature

model = Sequential()
model.add(Dense(32, input_dim=784))  #or 3 in the current posted example above
model.add(Activation('relu'))

In Keras LSTM, it refers to the total Time Steps

The term has been very confusing, is correct and we live in a very confusing world!!

I find one of the challenge in Machine Learning is to deal with different languages or dialects and terminologies (like if you have 5-8 highly different versions of English, then you need to very high proficiency to converse with different speakers). Probably this is the same in programming languages too.

Why maven? What are the benefits?

I've never come across point 2? Can you explain why you think this affects deployment in any way. If anything maven allows you to structure your projects in a modularised way that actually allows hot fixes for bugs in a particular tier, and allows independent development of an API from the remainder of the project for example.

It is possible that you are trying to cram everything into a single module, in which case the problem isn't really maven at all, but the way you are using it.

ListView inside ScrollView is not scrolling on Android

You cannot add a ListView in a scroll View, as list view also scolls and there would be a synchonization problem between listview scroll and scroll view scoll. You can make a CustomList View and add this method into it.

@Override 
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*
     * Prevent parent controls from stealing our events once we've gotten a touch down
     */
    if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
        ViewParent p = getParent();
        if (p != null) {
            p.requestDisallowInterceptTouchEvent(true);
        }
    }
    return false;
}

Creating virtual directories in IIS express

@Be.St.'s aprroach is true, but incomplete. I'm just copying his explanation with correcting the incorrect part.

IIS express configuration is managed by applicationhost.config.
You can find it in

Users\<username>\Documents\IISExpress\config folder.

Inside you can find the sites section that hold a section for each IIS Express configured site.

Add (or modify) a site section like this:

<site name="WebSiteWithVirtualDirectory" id="20">
   <application path="/" applicationPool="Clr4IntegratedAppPool">
     <virtualDirectory path="/" physicalPath="c:\temp\website1" />
     <virtualDirectory path="/OffSiteStuff" physicalPath="d:\temp\SubFolderApp" />
   </application>
   <bindings>
      <binding protocol="http" bindingInformation="*:1132:localhost" />
   </bindings>
</site>

Instead of adding a new application block, you should just add a new virtualDirectory element to the application parent element.

Edit - Visual Studio 2015

If you're looking for the applicationHost.config file and you're using VS2015 you'll find it in:

[solution_directory]/.vs/config/applicationHost.config

How can I output leading zeros in Ruby?

If the maximum number of digits in the counter is known (e.g., n = 3 for counters 1..876), you can do

str = "file_" + i.to_s.rjust(n, "0")

Can you have multiple $(document).ready(function(){ ... }); sections?

It's legal, but sometimes it cause undesired behaviour. As an Example I used the MagicSuggest library and added two MagicSuggest inputs in a page of my project and used seperate document ready functions for each initializations of inputs. The very first Input initialization worked, but not the second one and also not giving any error, Second Input didn't show up. So, I always recommend to use one Document Ready Function.

The most accurate way to check JS object's type?

var o = ...
var proto =  Object.getPrototypeOf(o);
proto === SomeThing;

Keep a handle on the prototype you expect the object to have, then compare against it.

for example

var o = "someString";
var proto =  Object.getPrototypeOf(o);
proto === String.prototype; // true

Run a Java Application as a Service on Linux

Linux service init script are stored into /etc/init.d. You can copy and customize /etc/init.d/skeleton file, and then call

service [yourservice] start|stop|restart

see http://www.ralfebert.de/blog/java/debian_daemon/. Its for Debian (so, Ubuntu as well) but fit more distribution.

How to compute the similarity between two text documents?

Here's a little app to get you started...

import difflib as dl

a = file('file').read()
b = file('file1').read()

sim = dl.get_close_matches

s = 0
wa = a.split()
wb = b.split()

for i in wa:
    if sim(i, wb):
        s += 1

n = float(s) / float(len(wa))
print '%d%% similarity' % int(n * 100)

ORA-01950: no privileges on tablespace 'USERS'

You cannot insert data because you have a quota of 0 on the tablespace. To fix this, run

ALTER USER <user> quota unlimited on <tablespace name>;

ALTER USER <user> quota 100M on <tablespace name>;

as a DBA user (depending on how much space you need / want to grant).

What is the best java image processing library/approach?

I'm not a Java guy, but OpenCV is great for my needs. Not sure if it fits yours. Here's a Java port, I think: http://docs.opencv.org/2.4/doc/tutorials/introduction/desktop_java/java_dev_intro.html

What does "select count(1) from table_name" on any database tables mean?

Difference between count(*) and count(1) in oracle?

count(*) means it will count all records i.e each and every cell BUT

count(1) means it will add one pseudo column with value 1 and returns count of all records

Why am I getting InputMismatchException?

Instead of using a dot, like: 1.2, try to input like this: 1,2.

How do I finish the merge after resolving my merge conflicts?

How do I finish the merge after resolving my merge conflicts?

With Git 2.12 (Q1 2017), you will have the more natural command:

git merge --continue

See commit c7d227d (15 Dec 2016) by Jeff King (peff).
See commit 042e290, commit c261a87, commit 367ff69 (14 Dec 2016) by Chris Packham (cpackham).
^{(Merged by Junio C Hamano -- gitster -- in commit 05f6e1b, 27 Dec 2016)}

See 2.12 release notes.

merge: add '--continue' option as a synonym for 'git commit'

Teach 'git merge' the --continue option which allows 'continuing' a merge by completing it.
The traditional way of completing a merge after resolving conflicts is to use 'git commit'.
Now with commands like 'git rebase' and 'git cherry-pick' having a '--continue' option adding such an option to 'git merge' presents a consistent UI.

Does the Java &= operator apply & or &&?

i came across a similar situation using booleans where I wanted to avoid calling b() if a was already false.

This worked for me:

a &= a && b()

A completely free agile software process tool

You can check out https://kanbanflow.com It's free for now because it's in beta and they say there is no time limit. It behaves very similar to AgileZen

I second the google doc, or you could use an online collaborative board that multiple people can edit.

Or you can host a more robust excel doc in skydrive from MS. I haven't tried that yet.

Mura.ly is another one that I am playing with currently. It has unlimited collaborators, though I think you would probably have to invite them everytime?? with a free account.

Hope that helps!

What is EOF in the C programming language?

EOF means end of file. It's a sign that the end of a file is reached, and that there will be no data anymore.

Edit:

I stand corrected. In this case it's not an end of file. As mentioned, it is passed when CTRL+d (linux) or CTRL+z (windows) is passed.

How to make CSS width to fill parent?

So after research the following is discovered:

For a div#bar setting display:block; width: auto; causes the equivalent of outerWidth:100%;

For a table#bar you need to wrap it in a div with the rules stated below. So your structure becomes:

<div id="foo">
 <div id="barWrap" style="border....">
  <table id="bar" style="width: 100%; border: 0; padding: 0; margin: 0;">

This way the table takes up the parent div 100%, and #barWrap is used to add borders/margin/padding to the #bar table. Note that you will need to set the background of the whole thing in #barWrap and have #bar's background be transparent or the same as #barWrap.

For textarea#bar and input#bar you need to do the same thing as table#bar, the down side is that by removing the borders you stop native widget rendering of the input/textarea and the #barWrap's borders will look a bit different than everything else, so you will probably have to style all your inputs this way.

What exactly does the "u" do? "git push -u origin master" vs "git push origin master"

The key is "argument-less git-pull". When you do a git pull from a branch, without specifying a source remote or branch, git looks at the branch.<name>.merge setting to know where to pull from. git push -u sets this information for the branch you're pushing.

To see the difference, let's use a new empty branch:

$ git checkout -b test

First, we push without -u:

$ git push origin test
$ git pull
You asked me to pull without telling me which branch you
want to merge with, and 'branch.test.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull(1) for details.

If you often merge with the same branch, you may want to
use something like the following in your configuration file:

    [branch "test"]
    remote = <nickname>
    merge = <remote-ref>

    [remote "<nickname>"]
    url = <url>
    fetch = <refspec>

See git-config(1) for details.

Now if we add -u:

$ git push -u origin test
Branch test set up to track remote branch test from origin.
Everything up-to-date
$ git pull
Already up-to-date.

Note that tracking information has been set up so that git pull works as expected without specifying the remote or branch.

Update: Bonus tips:

As Mark mentions in a comment, in addition to git pull this setting also affects default behavior of git push. If you get in the habit of using -u to capture the remote branch you intend to track, I recommend setting your push.default config value to upstream.
git push -u <remote> HEAD will push the current branch to a branch of the same name on <remote> (and also set up tracking so you can do git push after that).

Running multiple AsyncTasks at the same time -- not possible?

This allows for parallel execution on all android versions with API 4+ (Android 1.6+):

@TargetApi(Build.VERSION_CODES.HONEYCOMB) // API 11
void startMyTask(AsyncTask asyncTask) {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        asyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
    else
        asyncTask.execute(params);
}

This is a summary of Arhimed's excellent answer.

Please make sure you use API level 11 or higher as your project build target. In Eclipse, that is Project > Properties > Android > Project Build Target. This will not break backward compatibility to lower API levels. Don't worry, you will get Lint errors if your accidentally use features introduced later than minSdkVersion. If you really want to use features introduced later than minSdkVersion, you can suppress those errors using annotations, but in that case, you need take care about compatibility yourself. This is exactly what happened in the code snippet above.

Send and receive messages through NSNotificationCenter in Objective-C?

There is also the possibility of using blocks:

NSOperationQueue *mainQueue = [NSOperationQueue mainQueue];
[[NSNotificationCenter defaultCenter] 
     addObserverForName:@"notificationName" 
     object:nil
     queue:mainQueue
     usingBlock:^(NSNotification *notification)
     {
          NSLog(@"Notification received!");
          NSDictionary *userInfo = notification.userInfo;

          // ...
     }];

Apple's documentation

How to set the JSTL variable value in javascript?

As an answer I say No. You can only get values from jstl to javascript. But u can display the user name using javascript itself. Best ways are here. To display user name, if u have html like

<div id="uName"></div>

You can display user name as follows.

var val1 = document.getElementById('userName').value;
document.getElementById('uName').innerHTML = val1;

To get data from jstl to your javascript :

var userName = '<c:out value="${user}"/>';

here ${user} is the data you get as response(from backend).

Asigning number/array length

var arrayLength = <c:out value="${details.size()}"/>;

Advanced

function advanced(){
    var values = new Array();
    <c:if test="${empty details.users}">
       values.push("No user found"); 
    </c:if>         

    <c:if test="${!empty details.users}">
        <c:forEach var="user" items="${details.users}" varStatus="stat">
            values.push("${user.name}");   
        </c:forEach>
    </:c:if>
    alert("values[0] "+values[0]);

});

get all the images from a folder in php

//path to the directory to search/scan
        $directory = "";
         //echo "$directory"
        //get all files in a directory. If any specific extension needed just have to put the .extension
        //$local = glob($directory . "*"); 
        $local = glob("" . $directory . "{*.jpg,*.gif,*.png}", GLOB_BRACE);
        //print each file name
        echo "<ul>";

        foreach($local as $item)
        {
        echo '<li><a href="'.$item.'">'.$item.'</a></li>';
        }

        echo "</ul>";

How to change a table name using an SQL query?

In MySQL :-

RENAME TABLE `Stu Table` TO `Stu Table_10`

'Class' does not contain a definition for 'Method'

There are three possibilities:

1) If you are referring old DLL then it cant be used. So you have refer new DLL

2) If you are using it in different namespace and trying to use the other namespace's dll then it wont refer this method.

3) You may need to rebuild the project

I think third option might be the cause for you. Please post more information in order to understand exact problem of yours.

Is a GUID unique 100% of the time?

The Answer of "Is a GUID is 100% unique?" is simply "No" .

If You want 100% uniqueness of GUID then do following.
1. generate GUID
2. check if that GUID is Exist in your table column where you are looking for uniquensess
3. if exist then goto step 1 else step 4
4. use this GUID as unique.

Resetting a multi-stage form with jQuery

here is my solution, which also works with the new html5 input-types:

/**
 * removes all value attributes from input/textarea/select-fields the element with the given css-selector
 * @param {string} ele css-selector of the element | #form_5
 */
function clear_form_elements(ele) {
    $(ele).find(':input').each(function() {
        switch (this.type) {
            case 'checkbox':
            case 'radio':
                this.checked = false;
            default:
                $(this).val('');
                break;
        }
    });
}

Converting Array to List

where stateb is List'' bucket is a two dimensional array

statesb= IntStream.of(bucket[j-1]).boxed().collect(Collectors.toList());

with import java.util.stream.IntStream;

see https://examples.javacodegeeks.com/core-java/java8-convert-array-list-example/

How do I remove blue "selected" outline on buttons?

This is an issue in the Chrome family and has been there forever.

A bug has been raised https://bugs.chromium.org/p/chromium/issues/detail?id=904208

It can be shown here: https://codepen.io/anon/pen/Jedvwj as soon as you add a border to anything button-like (say role="button" has been added to a tag for example) Chrome messes up and sets the focus state when you click with your mouse. You should see that outline only on keyboard tab-press.

I highly recommend using this fix: https://github.com/wicg/focus-visible.

Just do the following

npm install --save focus-visible

Add the script to your html:

<script src="/node_modules/focus-visible/dist/focus-visible.min.js"></script>

or import into your main entry file if using webpack or something similar:

import 'focus-visible/dist/focus-visible.min';

then put this in your css file:

// hide the focus indicator if element receives focus via mouse, but show on keyboard focus (on tab).
.js-focus-visible :focus:not(.focus-visible) {
  outline: none;
}

// Define a strong focus indicator for keyboard focus.
// If you skip this then the browser's default focus indicator will display instead
// ideally use outline property for those users using windows high contrast mode
.js-focus-visible .focus-visible {
  outline: magenta auto 5px;
}

You can just set:

button:focus {outline:0;}

but if you have a large number of users, you're disadvantaging those who cannot use mice or those who just want to use their keyboard for speed.

Use StringFormat to add a string to a WPF XAML binding

In xaml

<TextBlock Text="{Binding CelsiusTemp}" />

In ViewModel, this way setting the value also works:

 public string CelsiusTemp
        {
            get { return string.Format("{0}°C", _CelsiusTemp); }
            set
            {
                value = value.Replace("°C", "");
              _CelsiusTemp = value;
            }
        }

Best way to list files in Java, sorted by Date Modified?

What's about similar approach, but without boxing to the Long objects:

File[] files = directory.listFiles();

Arrays.sort(files, new Comparator<File>() {
    public int compare(File f1, File f2) {
        return Long.compare(f1.lastModified(), f2.lastModified());
    }
});

wampserver doesn't go green - stays orange

Make a Ctrl+Alt+Suppr in order to see if no other Apache version is ever runing on your computer. It was the case for me, I just stop them and the light pass green!

Cheers!

Long Press in JavaScript?

Most elegant and clean is a jQuery plugin: https://github.com/untill/jquery.longclick/, also available as packacke: https://www.npmjs.com/package/jquery.longclick.

In short, you use it like so:

$( 'button').mayTriggerLongClicks().on( 'longClick', function() { your code here } );

The advantage of this plugin is that, in contrast to some of the other answers here, click events are still possible. Note also that a long click occurs, just like a long tap on a device, before mouseup. So, that's a feature.

Keyboard shortcuts in WPF

Documenting this answer for others, as there is a much simpler way to do this that is rarely referenced, and doesn't require touching the XAML at all.

To link a keyboard shortcut, in the Window constructor simply add a new KeyBinding to the InputBindings collection. As the command, pass in your arbitrary command class that implements ICommand. For the execute method, simply implement whatever logic you need. In my example below, my WindowCommand class takes a delegate that it will execute whenever invoked. When I construct the new WindowCommand to pass in with my binding, I simply indicate in my initializer, the method that I want the WindowCommand to execute.

You can use this pattern to come up with your own quick keyboard shortcuts.

public YourWindow() //inside any WPF Window constructor
{
   ...
   //add this one statement to bind a new keyboard command shortcut
   InputBindings.Add(new KeyBinding( //add a new key-binding, and pass in your command object instance which contains the Execute method which WPF will execute
      new WindowCommand(this)
      {
         ExecuteDelegate = TogglePause //REPLACE TogglePause with your method delegate
      }, new KeyGesture(Key.P, ModifierKeys.Control)));
   ...
}

Create a simple WindowCommand class which takes an execution delegate to fire off any method set on it.

public class WindowCommand : ICommand
{
    private MainWindow _window;

    //Set this delegate when you initialize a new object. This is the method the command will execute. You can also change this delegate type if you need to.
    public Action ExecuteDelegate { get; set; }

    //You don't have to add a parameter that takes a constructor. I've just added one in case I need access to the window directly.
    public WindowCommand(MainWindow window)
    {
        _window = window;
    }

    //always called before executing the command, mine just always returns true
    public bool CanExecute(object parameter)
    {
        return true; //mine always returns true, yours can use a new CanExecute delegate, or add custom logic to this method instead.
    }

    public event EventHandler CanExecuteChanged; //i'm not using this, but it's required by the interface

    //the important method that executes the actual command logic
    public void Execute(object parameter)
    {
        if (ExecuteDelegate != null)
        {
            ExecuteDelegate();
        }
        else
        {
            throw new InvalidOperationException();
        }
    }
}

Error in strings.xml file in Android

You may be able to use unicode equivalent both apostrophe and other characters which are not supported in xml string. Apostrophe's equivalent is "\u0027" .

Difference between Activity and FragmentActivity

A FragmentActivity is a subclass of Activity that was built for the Android Support Package.

The FragmentActivity class adds a couple new methods to ensure compatibility with older versions of Android, but other than that, there really isn't much of a difference between the two. Just make sure you change all calls to getLoaderManager() and getFragmentManager() to getSupportLoaderManager() and getSupportFragmentManager() respectively.

How to use (install) dblink in PostgreSQL?

On linux, find dblink.sql, then execute in the postgresql console something like this to create all required functions:

\i /usr/share/postgresql/8.4/contrib/dblink.sql

you might need to install the contrib packages: sudo apt-get install postgresql-contrib

Getting data-* attribute for onclick event for an html element

You can achieve this $(identifier).data('id') using jquery,

    <script type="text/javascript">

        function goDoSomething(identifier){     
            alert("data-id:"+$(identifier).data('id')+", data-option:"+$(identifier).data('option'));               
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this);">
           Click to do something
    </a>

javascript : You can use getAttribute("attributename") if want to use javascript tag,

    <script type="text/javascript">

        function goDoSomething(d){
            alert(d.getAttribute("data-id"));
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this);">
           Click to do something
    </a>

Or:

    <script type="text/javascript">

        function goDoSomething(data_id, data_option){       

            alert("data-id:"+data_id+", data-option:"+data_option);
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this.getAttribute('data-id'), this.getAttribute('data-option'));">
           Click to do something
    </a>

How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and Keychain (Linux)

PPK ? OpenSSH RSA with PuttyGen & Docker.

Private key:

docker run --rm -v $(pwd):/app zinuzoid/puttygen private.ppk -O private-openssh -o my-openssh-key

Public key:

docker run --rm -v $(pwd):/app zinuzoid/puttygen private.ppk -L -o my-openssh-key.pub

How to add and remove classes in Javascript without jQuery

When you remove RegExp from the equation you leave a less "friendly" code, but it still can be done with the (much) less elegant way of split().

function removeClass(classString, toRemove) {
    classes = classString.split(' ');
    var out = Array();
    for (var i=0; i<classes.length; i++) {
        if (classes[i].length == 0) // double spaces can create empty elements
            continue;
        if (classes[i] == toRemove) // don't include this one
            continue;
        out.push(classes[i])
    }
    return out.join(' ');
}

This method is a lot bigger than a simple replace() but at least it can be used on older browsers. And in case the browser doesn't even support the split() command it's relatively easy to add it using prototype.

How to parse a String containing XML in Java and retrieve the value of the root node?

One of the above answer states to convert XML String to bytes which is not needed. Instead you can can use InputSource and supply it with StringReader.

String xmlStr = "<message>HELLO!</message>";
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = db.parse(new InputSource(new StringReader(xmlStr)));
System.out.println(doc.getFirstChild().getNodeValue());

How can I display a tooltip message on hover using jQuery?

Following will work like a charm (assuming you have div/span/table/tr/td/etc with "id"="myId")

    $("#myId").hover(function() {
        $(this).css('cursor','pointer').attr('title', 'This is a hover text.');
    }, function() {
        $(this).css('cursor','auto');
    });

As a complimentary, .css('cursor','pointer') will change the mouse pointer on hover.

C# "as" cast vs classic cast

using as will return null if not a valid cast which allows you to do other things besides wrapping the cast in a try/catch. I hate classic cast. I always use as cast if i'm not sure. Plus, exceptions are expensive. Null checks are not.

memcpy() vs memmove()

C11 standard draft

The C11 N1570 standard draft says:

7.24.2.1 "The memcpy function":

2 The memcpy function copies n characters from the object pointed to by s2 into the object pointed to by s1. If copying takes place between objects that overlap, the behavior is undefined.

7.24.2.2 "The memmove function":

2 The memmove function copies n characters from the object pointed to by s2 into the object pointed to by s1. Copying takes place as if the n characters from the object pointed to by s2 are first copied into a temporary array of n characters that does not overlap the objects pointed to by s1 and s2, and then the n characters from the temporary array are copied into the object pointed to by s1

Therefore, any overlap on memcpy leads to undefined behavior, and anything can happen: bad, nothing or even good. Good is rare though :-)

memmove however clearly says that everything happens as if an intermediate buffer is used, so clearly overlaps are OK.

C++ std::copy is more forgiving however, and allows overlaps: Does std::copy handle overlapping ranges?

What is the difference between static_cast<> and C style casting?

static_cast checks at compile time that conversion is not between obviously incompatible types. Contrary to dynamic_cast, no check for types compatibility is done at run time. Also, static_cast conversion is not necessarily safe.

static_cast is used to convert from pointer to base class to pointer to derived class, or between native types, such as enum to int or float to int.

The user of static_cast must make sure that the conversion is safe.

The C-style cast does not perform any check, either at compile or at run time.

Maven Unable to locate the Javac Compiler in:

If you we are doing all above steps that may be confused and our problem is just missing tools.jre so just add tools.jre by the following steps and problem is solved.

Step 1 : In eclipse go to Windows -> preferences

Step 2 : Java -> Installed JREs (Double click on it)

Step 3 : Click Edit button -> Click Add External JARs

Step 4 : Now select tools.jar path

now apply changes and it works fine.

Here is screenshoot

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

Here is a beautiful and minimalist way to go

(num > 1 && num < 5) ? first_case_method() 
                     : System.out.println("testing case 1 to 5")
                     : (num > 5 && num < 7)  ? System.out.println("testing case 5 to 7") 
                     : (num > 7 && num < 8)  ? System.out.println("testing case 7 to 8") 
                     : (num > 8 && num < 9)  ? System.out.println("testing case 8 to 9") 
                     : ... 
                     : System.out.println("default");

"Press Any Key to Continue" function in C

You don't say what system you're using, but as you already have some answers that may or may not work for Windows, I'll answer for POSIX systems.

In POSIX, keyboard input comes through something called a terminal interface, which by default buffers lines of input until Return/Enter is hit, so as to deal properly with backspace. You can change that with the tcsetattr call:

#include <termios.h>

struct termios info;
tcgetattr(0, &info);          /* get current terminal attirbutes; 0 is the file descriptor for stdin */
info.c_lflag &= ~ICANON;      /* disable canonical mode */
info.c_cc[VMIN] = 1;          /* wait until at least one keystroke available */
info.c_cc[VTIME] = 0;         /* no timeout */
tcsetattr(0, TCSANOW, &info); /* set immediately */

Now when you read from stdin (with getchar(), or any other way), it will return characters immediately, without waiting for a Return/Enter. In addition, backspace will no longer 'work' -- instead of erasing the last character, you'll read an actual backspace character in the input.

Also, you'll want to make sure to restore canonical mode before your program exits, or the non-canonical handling may cause odd effects with your shell or whoever invoked your program.

center aligning a fixed position div

A solution using flex box; fully responsive:

parent_div {
    position: fixed;
    width: 100%;
    display: flex;
    justify-content: center;
}

child_div {
    /* whatever you want */
}

Use Font Awesome Icon in Placeholder

I added both text and icon together in a placeholder.

placeholder="Edit &nbsp; &#xf040;"

CSS :

font-family: FontAwesome,'Merriweather Sans', sans-serif;

Python + Django page redirect

Beware. I did this on a development server and wanted to change it later.

Firefox 5 'caching' 301 redirects

I had to clear my caches to change it. In order to avoid this head-scratching in the future, I was able to make it temporary like so:

from django.views.generic import RedirectView

url(r'^source$', RedirectView.as_view(permanent=False, 
                                      url='/dest/')),

jquery get height of iframe content when loaded

This is my ES6 friendly no-jquery take

document.querySelector('iframe').addEventListener('load', function() {
    const iframeBody = this.contentWindow.document.body;
    const height = Math.max(iframeBody.scrollHeight, iframeBody.offsetHeight);
    this.style.height = `${height}px`;
});

Does Python have an ordered set?

Implementations on PyPI

While others have pointed out that there is no built-in implementation of an insertion-order preserving set in Python (yet), I am feeling that this question is missing an answer which states what there is to be found on PyPI.

There are the packages:

ordered-set (Python based)
orderedset (Cython based)
collections-extended
boltons (under iterutils.IndexedSet, Python-based)
oset (last updated in 2012)

Some of these implementations are based on the recipe posted by Raymond Hettinger to ActiveState which is also mentioned in other answers here.

Some differences

ordered-set (version 1.1)
advantage: O(1) for lookups by index (e.g. my_set[5])
oset (version 0.1.3)
advantage: O(1) for remove(item)
disadvantage: apparently O(n) for lookups by index

Both implementations have O(1) for add(item) and __contains__(item) (item in my_set).

Rails 4: before_filter vs. before_action

As we can see in ActionController::Base, before_action is just a new syntax for before_filter.

However all before_filters syntax are deprecated in Rails 5.0 and will be removed in Rails 5.1

How can I convert comma separated string into a List<int>

What is the difference between JavaScript and ECMAScript?

I think a little history lesson is due.

JavaScript was originally named Mocha and changed to Livescript but ultimately became JavaScript.

It's important to note that JavaScript came before ECMAscript and the history will tell you why.

To start from the beginning, JavaScript derived its name from Java and initially Brendan Eich (the creator of JS) was asked to develop a language that resembled Java for the web for Netscape.

Eich, however decided that Java was too complicated with all its rules and so set out to create a simpler language that even a beginner could code in. This is evident in such things like the relaxing of the need to have a semicolon.

After the language was complete, the marketing team of Netscape requested Sun to allow them to name it JavaScript as a marketing stunt and hence why most people who have never used JavaScript think it's related to Java.

About a year or two after JavaScript's release in the browser, Microsoft's IE took the language and started making its own implementations such as JScript. At the same time, IE was dominating the market and not long after Netscape had to shut its project.

Before Netscape went down, they decided to start a standard that would guide the path of JavaScript, named ECMAScript.

ECMAScript had a few releases and in 1999 they released their last version (ECMAScript 3) before they went into hibernation for the next 10 years. During this 10 years, Microsoft dominated the scenes but at the same time they weren't improving their product and hence Firefox was born (led by Eich) and a whole heap of other browsers such as Chrome, Opera.

ECMAScript released its 5th Edition in 2009 (the 4th edition was abandoned) with features such as strict mode. Since then, ECMAScript has gained a lot of momentum and is scheduled to release its 6th Edition in a few months from now with the biggest changes its had thus far.

You can use a list of features for ECMAScript 6 here http://kangax.github.io/es5-compat-table/es6/ and also the browser support. You can even start writing Ecmascript 6 like you do with CoffeeScript and use a compiler to compile down to Ecmascript 5.

Whether ECMAScript is the language and JavaScript is a dialect is arguable, but not important. If you continue to think like this it might confuse you. There is no compiler out there that would run ECMAScript, and I believe JavaScript is considered the Language which implements a standard called ECMAScript.

There are also other noticeable languages that implement ECMAScript such as ActionScript (used for Flash)

urllib2.HTTPError: HTTP Error 403: Forbidden

NSE website has changed and the older scripts are semi-optimum to current website. This snippet can gather daily details of security. Details include symbol, security type, previous close, open price, high price, low price, average price, traded quantity, turnover, number of trades, deliverable quantities and ratio of delivered vs traded in percentage. These conveniently presented as list of dictionary form.

Python 3.X version with requests and BeautifulSoup

from requests import get
from csv import DictReader
from bs4 import BeautifulSoup as Soup
from datetime import date
from io import StringIO 

SECURITY_NAME="3MINDIA" # Change this to get quote for another stock
START_DATE= date(2017, 1, 1) # Start date of stock quote data DD-MM-YYYY
END_DATE= date(2017, 9, 14)  # End date of stock quote data DD-MM-YYYY


BASE_URL = "https://www.nseindia.com/products/dynaContent/common/productsSymbolMapping.jsp?symbol={security}&segmentLink=3&symbolCount=1&series=ALL&dateRange=+&fromDate={start_date}&toDate={end_date}&dataType=PRICEVOLUMEDELIVERABLE"




def getquote(symbol, start, end):
    start = start.strftime("%-d-%-m-%Y")
    end = end.strftime("%-d-%-m-%Y")

    hdr = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',
         'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
         'Referer': 'https://cssspritegenerator.com',
         'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
         'Accept-Encoding': 'none',
         'Accept-Language': 'en-US,en;q=0.8',
         'Connection': 'keep-alive'}

    url = BASE_URL.format(security=symbol, start_date=start, end_date=end)
    d = get(url, headers=hdr)
    soup = Soup(d.content, 'html.parser')
    payload = soup.find('div', {'id': 'csvContentDiv'}).text.replace(':', '\n')
    csv = DictReader(StringIO(payload))
    for row in csv:
        print({k:v.strip() for k, v in row.items()})


 if __name__ == '__main__':
     getquote(SECURITY_NAME, START_DATE, END_DATE)

Besides this is relatively modular and ready to use snippet.

Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error

Also could be that you're missing to link against a Binary Library, check Build Phases in your Targes add required libraries and then Product > Clean Product > Build

That must work too!

How to get a value of an element by name instead of ID

Only one thing more: when you´re using the "crasis variable assignment" you need to use double cotes too AND you do not need to use the "input" word!:

valInput  = $(`[name="${inputNameHere}"]`).val();

How can I add reflection to a C++ application?

You can achieve cool static reflection features for structs with BOOST_HANA_DEFINE_STRUCT from the Boost::Hana library.
Hana is quite versatile, not only for the usecase you have in mind but for a lot of template metaprogramming.

Copying PostgreSQL database to another server

Run this command with database name, you want to backup, to take dump of DB.

 pg_dump -U {user-name} {source_db} -f {dumpfilename.sql}

 eg. pg_dump -U postgres mydbname -f mydbnamedump.sql

Now scp this dump file to remote machine where you want to copy DB.

eg. scp mydbnamedump.sql user01@remotemachineip:~/some/folder/

On remote machine run following command in ~/some/folder to restore the DB.

 psql -U {user-name} -d {desintation_db}-f {dumpfilename.sql}

 eg. psql -U postgres -d mynewdb -f mydbnamedump.sql

Recreate the default website in IIS

I suppose you want to publish and access your applications/websites from LAN; probably as virtual directories under the default website.The steps could vary depending on your IIS version, but basically it comes down to these steps:

Restore your "Default Website" Website :

create a new website
set "Default Website" as its name
In the Binding section (bottom panel), enter your local IP address in the "IP Address" edit.
Keep the "Host" edit empty

that's it: now whenever you type your local ip address in your browser, you will get the website you just added. Now if you want to access any of your other webapplications/websites from LAN, just add a virtual application under your default website pointing to the directory containing your published application/website. Now you can type : http://yourLocalIPAddress/theNameOfYourApplication to access it from your LAN.

Removing an activity from the history stack

Try this:

intent.addFlags(Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY)

it is API Level 1, check the link.

Java random numbers using a seed

That's the principle of a Pseudo-RNG. The numbers are not really random. They are generated using a deterministic algorithm, but depending on the seed, the sequence of generated numbers vary. Since you always use the same seed, you always get the same sequence.

Parse v. TryParse

The TryParse method allows you to test whether something is parseable. If you try Parse as in the first instance with an invalid int, you'll get an exception while in the TryParse, it returns a boolean letting you know whether the parse succeeded or not.

As a footnote, passing in null to most TryParse methods will throw an exception.

Bad File Descriptor with Linux Socket write() Bad File Descriptor C

In general, when "Bad File Descriptor" is encountered, it means that the socket file descriptor you passed into the API is not valid, which has multiple possible reasons:

The fd is already closed somewhere.
The fd has a wrong value, which is inconsistent with the value obtained from socket() api

How to sort an object array by date property?

With ES6 arrow functions, you can further write just one line of concise code (excluding variable declaration).

Eg.:

_x000D_

var isDescending = true; //set to false for ascending
console.log(["8/2/2020","8/1/2020","8/13/2020", "8/2/2020"].sort((a,b) => isDescending ? new Date(b).getTime() - new Date(a).getTime() : new Date(a).getTime() - new Date(b).getTime()));

_x000D_

Since time does not exists with the above dates, the Date object will consider following default time for sorting:

00:00:00

The code will work for both ascending and descending sort. Just change the value of isDescending variable as required.

How to pop an alert message box using PHP?

You can use DHP to do this. It is absolutely simple and it is fast than script. Just write alert('something'); It is not programing language it is something like a lit bit jquery. You need require dhp.php in the top and in the bottom require dhpjs.php. For now it is not open source but when it is you can use it. It is our programing language ;)

setHintTextColor() in EditText

Inside Layout Xml File We can Change Color of Hint.....

android:textColorHint="@android:color/*****"

you can replace * with color or color code.

How can I check if string contains characters & whitespace, not just whitespace?

Instead of checking the entire string to see if there's only whitespace, just check to see if there's at least one character of non whitespace:

if (/\S/.test(myString)) {
    // string is not empty and not just whitespace
}

Convert array into csv

Add some improvements based on accepted answer.

PHP 7.0 Strict typing
PHP 7.0 Type declaration and Return type declaration
Enclosure \r, \n, \t
Don't enclosure empty string even $encloseAll is TRUE

/**
  * Formats a line (passed as a fields array) as CSV and returns the CSV as a string.
  * Adapted from https://www.php.net/manual/en/function.fputcsv.php#87120
  */
function arrayToCsv(array $fields, string $delimiter = ';', string $enclosure = '"', bool $encloseAll = false, bool $nullToMysqlNull = false): string {

    $delimiter_esc = preg_quote($delimiter, '/');
    $enclosure_esc = preg_quote($enclosure, '/');

    $output = [];
    foreach ($fields as $field) {
        if ($field === null && $nullToMysqlNull) {
            $output[] = 'NULL';
            continue;
        }
        // Enclose fields containing $delimiter, $enclosure or whitespace, newline
        $field = strval($field);
        if (strlen($field) && ($encloseAll || preg_match("/(?:${delimiter_esc}|${enclosure_esc}|\s|\r|\n|\t)/", $field))) {
            $output[] = $enclosure . str_replace($enclosure, $enclosure . $enclosure, $field) . $enclosure;
        } else {
            $output[] = $field;
        }
    }

    return implode($delimiter, $output);

}

Android widget: How to change the text of a button

//text button:

<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" text button" />

// color text button:

<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="text button" 
        android:textColor="@android:color/color text"/>

// background button

<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="text button" 
        android:textColor="@android:color/white"
        android:background="@android:color/ background button"/>

// text size button

<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="text button" 
        android:textColor="@android:color/white"
        android:background="@android:color/black"
        android:textSize="text size"/>

How do I prevent a Gateway Timeout with FastCGI on Nginx

If you use unicorn.

Look at top on your server. Unicorn likely is using 100% of CPU right now. There are several reasons of this problem.

You should check your HTTP requests, some of their can be very hard.
Check unicorn's version. May be you've updated it recently, and something was broken.

Android: how to hide ActionBar on certain activities

This works for me! Put this in your Activity in manifests

<activity
   // ...
   android:theme="@style/Theme.AppCompat.Light.NoActionBar"
   // ...
   </activity>

You can also make your custom theme in styles.xml like this:

<style name="Theme.MyCustomTheme" parent="@style/Theme.AppCompat.Light.NoActionBar">
        <item name = "android:windowActionBar">false</item>
        <item name = "android:windowNoTitle">true</item>
        // more custom...
    </style>

Hope this help.

How do I increase the RAM and set up host-only networking in Vagrant?

You can modify various VM properties by adding the following configuration (see the Vagrant docs for a bit more info):

  # Configure VM Ram usage
  config.vm.customize [
                        "modifyvm", :id,
                        "--name", "Test_Environment",
                        "--memory", "1024"
                      ]

You can obtain the properties that you want to change from the documents for VirtualBox command-line options:

http://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm

The vagrant documentation has the section on how to change IP address:

Vagrant::Config.run do |config|
  config.vm.network :hostonly, "192.168.50.4"
end

Also you can restructure the configuration like this, ending is do with end without nesting it. This is simpler.

config.vm.define :web do |web_config|
    web_config.vm.box = "lucid32"
    web_config.vm.forward_port 80, 8080
end
web_config.vm.provision :puppet do |puppet|
    puppet.manifests_path = "manifests"
    puppet.manifest_file = "lucid32.pp"
end

Finding Variable Type in JavaScript

Here is the Complete solution.

You can also use it as a Helper class in your Projects.

_x000D_

"use strict";_x000D_
/**_x000D_
 * @description Util file_x000D_
 * @author Tarandeep Singh_x000D_
 * @created 2016-08-09_x000D_
 */_x000D_
_x000D_
window.Sys = {};_x000D_
_x000D_
Sys = {_x000D_
  isEmptyObject: function(val) {_x000D_
    return this.isObject(val) && Object.keys(val).length;_x000D_
  },_x000D_
  /** This Returns Object Type */_x000D_
  getType: function(val) {_x000D_
    return Object.prototype.toString.call(val);_x000D_
  },_x000D_
  /** This Checks and Return if Object is Defined */_x000D_
  isDefined: function(val) {_x000D_
    return val !== void 0 || typeof val !== 'undefined';_x000D_
  },_x000D_
  /** Run a Map on an Array **/_x000D_
  map: function(arr, fn) {_x000D_
    var res = [],_x000D_
      i = 0;_x000D_
    for (; i < arr.length; ++i) {_x000D_
      res.push(fn(arr[i], i));_x000D_
    }_x000D_
    arr = null;_x000D_
    return res;_x000D_
  },_x000D_
  /** Checks and Return if the prop is Objects own Property */_x000D_
  hasOwnProp: function(obj, val) {_x000D_
    return Object.prototype.hasOwnProperty.call(obj, val);_x000D_
  },_x000D_
  /** Extend properties from extending Object to initial Object */_x000D_
  extend: function(newObj, oldObj) {_x000D_
    if (this.isDefined(newObj) && this.isDefined(oldObj)) {_x000D_
      for (var prop in oldObj) {_x000D_
        if (this.hasOwnProp(oldObj, prop)) {_x000D_
          newObj[prop] = oldObj[prop];_x000D_
        }_x000D_
      }_x000D_
      return newObj;_x000D_
    } else {_x000D_
      return newObj || oldObj || {};_x000D_
    }_x000D_
  }_x000D_
};_x000D_
_x000D_
// This Method will create Multiple functions in the Sys object that can be used to test type of_x000D_
['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Object', 'Array', 'Undefined']_x000D_
.forEach(_x000D_
  function(name) {_x000D_
    Sys['is' + name] = function(obj) {_x000D_
      return toString.call(obj) == '[object ' + name + ']';_x000D_
    };_x000D_
  }_x000D_
);

_x000D_

<h1>Use the Helper JavaScript Methods..</h1>_x000D_
<code>use: if(Sys.isDefined(jQuery){console.log("O Yeah... !!");}</code>

_x000D_

For Exportable CommonJs Module or RequireJS Module....

"use strict";

/*** Helper Utils ***/

/**
 * @description Util file :: From Vault
 * @author Tarandeep Singh
 * @created 2016-08-09
 */

var Sys = {};

Sys = {
    isEmptyObject: function(val){
        return this.isObject(val) && Object.keys(val).length;
    },
    /** This Returns Object Type */
    getType: function(val){
        return Object.prototype.toString.call(val);
    },
    /** This Checks and Return if Object is Defined */
    isDefined: function(val){
        return val !== void 0 || typeof val !== 'undefined';
    },
    /** Run a Map on an Array **/
    map: function(arr,fn){
        var res = [], i=0;
        for( ; i<arr.length; ++i){
            res.push(fn(arr[i], i));
        }
        arr = null;
        return res;
    },
    /** Checks and Return if the prop is Objects own Property */
    hasOwnProp: function(obj, val){
        return Object.prototype.hasOwnProperty.call(obj, val);
    },
    /** Extend properties from extending Object to initial Object */
    extend: function(newObj, oldObj){
        if(this.isDefined(newObj) && this.isDefined(oldObj)){
            for(var prop in oldObj){
                if(this.hasOwnProp(oldObj, prop)){
                    newObj[prop] = oldObj[prop];
                }
            }
            return newObj;
        }else {
            return newObj || oldObj || {};
        }
    }
};

/**
 * This isn't Required but just makes WebStorm color Code Better :D
 * */
Sys.isObject
    = Sys.isArguments
    = Sys.isFunction
    = Sys.isString
    = Sys.isArray
    = Sys.isUndefined
    = Sys.isDate
    = Sys.isNumber
    = Sys.isRegExp
    = "";

/** This Method will create Multiple functions in the Sys object that can be used to test type of **/

['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Object', 'Array', 'Undefined']
    .forEach(
        function(name) {
            Sys['is' + name] = function(obj) {
                return toString.call(obj) == '[object ' + name + ']';
            };
        }
    );


module.exports = Sys;

Currently in Use on a public git repo. Github Project

Now you can import this Sys code in a Sys.js file. then you can use this Sys object functions to find out the type of JavaScript Objects

you can also check is Object is Defined or type is Function or the Object is Empty... etc.

Sys.isObject
Sys.isArguments
Sys.isFunction
Sys.isString
Sys.isArray
Sys.isUndefined
Sys.isDate
Sys.isNumber
Sys.isRegExp

For Example

var m = function(){};
Sys.isObject({});
Sys.isFunction(m);
Sys.isString(m);

console.log(Sys.isDefined(jQuery));

EditText, inputType values (xml)

You can use the properties tab in eclipse to set various values.

here are all the possible values

none
text
textCapCharacters
textCapWords
textCapSentences
textAutoCorrect
textAutoComplete
textMultiLine
textImeMultiLine
textNoSuggestions
textUri
textEmailAddress
textEmailSubject
textShortMessage
textLongMessage
textPersonName
textPostalAddress
textPassword
textVisiblePassword
textWebEditText
textFilter
textPhonetic
textWebEmailAddress
textWebPassword
number
numberSigned
numberDecimal
numberPassword
phone
datetime
date
time

Check here for explanations: http://developer.android.com/reference/android/widget/TextView.html#attr_android:inputType

When should I use Write-Error vs. Throw? Terminating vs. non-terminating errors

How do I pipe or redirect the output of curl -v?

The following worked for me:

Put your curl statement in a script named abc.sh

Now run:

sh abc.sh 1>stdout_output 2>stderr_output

You will get your curl's results in stdout_output and the progress info in stderr_output.

Eclipse reported "Failed to load JNI shared library"

First, ensure that your version of Eclipse and JDK match, either both 64-bit or both 32-bit (you can't mix-and-match 32-bit with 64-bit).

Second, the -vm argument in eclipse.ini should point to the java executable. See http://wiki.eclipse.org/Eclipse.ini for examples.

If you're unsure of what version (64-bit or 32-bit) of Eclipse you have installed, you can determine that a few different ways. See How to find out if an installed Eclipse is 32 or 64 bit version?

Response.Redirect with POST instead of Get?

In PHP, you can send POST data with cURL. Is there something comparable for .NET?

Yes, HttpWebRequest, see my post below.

Building a complete online payment gateway like Paypal

What you're talking about is becoming a payment service provider. I have been there and done that. It was a lot easier about 10 years ago than it is now, but if you have a phenomenal amount of time, money and patience available, it is still possible.

You will need to contact an acquiring bank. You didnt say what region of the world you are in, but by this I dont mean a local bank branch. Each major bank will generally have a separate card acquiring arm. So here in the UK we have (eg) Natwest bank, which uses Streamline (or Worldpay) as its acquiring arm. In total even though we have scores of major banks, they all end up using one of five or so card acquirers.

Happily, all UK card acquirers use a standard protocol for communication of authorisation requests, and end of day settlement. You will find minor quirks where some acquiring banks support some features and have slightly different syntax, but the differences are fairly minor. The UK standards are published by the Association for Payment Clearing Services (APACS) (which is now known as the UKPA). The standards are still commonly referred to as APACS 30 (authorization) and APACS 29 (settlement), but are now formally known as APACS 70 (books 1 through 7).

Although the APACS standard is widely supported across the UK (Amex and Discover accept messages in this format too) it is not used in other countries - each country has it's own - for example: Carte Bancaire in France, CartaSi in Italy, Sistema 4B in Spain, Dankort in Denmark etc. An effort is under way to unify the protocols across Europe - see EPAS.org

Communicating with the acquiring bank can be done a number of ways. Again though, it will depend on your region. In the UK (and most of Europe) we have one communications gateway that provides connectivity to all the major acquirers, they are called TNS and there are dozens of ways of communicating through them to the acquiring bank, from dialup 9600 baud modems, ISDN, HTTPS, VPN or dedicated line. Ultimately the authorisation request will be converted to X25 protocol, which is the protocol used by these acquiring banks when communicating with each other.

In summary then: it all depends on your region.

Contact a major bank and try to get through to their card acquiring arm.
Explain that you're setting up as a payment service provider, and request details on comms format for authorization requests and end of day settlement files
Set up a test merchant account and develop auth/settlement software and go through the accreditation process. Most acquirers help you through this process for free, but when you want to register as an accredited PSP some will request a fee.
you will need to comply with some regulations too, for example you may need to register as a payment institution

Once you are registered and accredited you'll then be able to accept customers and set up merchant accounts on behalf of the bank/s you're accredited against (bearing in mind that each acquirer will generally support multiple banks). Rinse and repeat with other acquirers as you see necessary.

Beyond that you have lots of other issues, mainly dealing with PCI-DSS. Thats a whole other topic and there are already some q&a's on this site regarding that. Like I say, its a phenomenal undertaking - most likely a multi-year project even for a reasonably sized team, but its certainly possible.

Print array to a file

Just use print_r ; ) Read the documentation:

If you would like to capture the output of print_r(), use the return parameter. When this parameter is set to TRUE, print_r() will return the information rather than print it.

So this is one possibility:

$fp = fopen('file.txt', 'w');
fwrite($fp, print_r($array, TRUE));
fclose($fp);

How to select a schema in postgres when using psql?

if playing with psql inside docker exec it like this:

docker exec -e "PGOPTIONS=--search_path=<your_schema>" -it docker_pg psql -U user db_name

How to hide axes and gridlines in Matplotlib (python)

# Hide grid lines
ax.grid(False)

# Hide axes ticks
ax.set_xticks([])
ax.set_yticks([])
ax.set_zticks([])

Note, you need matplotlib>=1.2 for set_zticks() to work.

How to send/receive SOAP request and response using C#?

The urls are different.

http://localhost/AccountSvc/DataInquiry.asmx

vs.

/acctinqsvc/portfolioinquiry.asmx

Resolve this issue first, as if the web server cannot resolve the URL you are attempting to POST to, you won't even begin to process the actions described by your request.

You should only need to create the WebRequest to the ASMX root URL, ie: http://localhost/AccountSvc/DataInquiry.asmx, and specify the desired method/operation in the SOAPAction header.

The SOAPAction header values are different.

http://localhost/AccountSvc/DataInquiry.asmx/ + methodName

vs.

http://tempuri.org/GetMyName

You should be able to determine the correct SOAPAction by going to the correct ASMX URL and appending ?wsdl

There should be a <soap:operation> tag underneath the <wsdl:operation> tag that matches the operation you are attempting to execute, which appears to be GetMyName.

There is no XML declaration in the request body that includes your SOAP XML.

You specify text/xml in the ContentType of your HttpRequest and no charset. Perhaps these default to us-ascii, but there's no telling if you aren't specifying them!

The SoapUI created XML includes an XML declaration that specifies an encoding of utf-8, which also matches the Content-Type provided to the HTTP request which is: text/xml; charset=utf-8

Hope that helps!

how to get a list of dates between two dates in java

This is simple solution for get a list of dates

import java.io.*;
import java.util.*;
import java.text.SimpleDateFormat;  
public class DateList
{

public static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

 public static void main (String[] args) throws java.lang.Exception
 {

    Date dt = new Date();
    System.out.println(dt);

        List<Date> dates = getDates("2017-01-01",dateFormat.format(new Date()));
        //IF you don't want to reverse then remove Collections.reverse(dates);
         Collections.reverse(dates);
        System.out.println(dates.size());
    for(Date date:dates)
    {
        System.out.println(date);
    }
 }
 public static List<Date> getDates(String fromDate, String toDate)
 {
    ArrayList<Date> dates = new ArrayList<Date>();

    try {

        Calendar fromCal = Calendar.getInstance();
        fromCal.setTime(dateFormat .parse(fromDate));

        Calendar toCal = Calendar.getInstance();
        toCal.setTime(dateFormat .parse(toDate));

        while(!fromCal.after(toCal))
        {
            dates.add(fromCal.getTime());
            fromCal.add(Calendar.DATE, 1);
        }


    } catch (Exception e) {
        System.out.println(e);
    }
    return dates;
 }
}

Delete all rows in an HTML table

Just Clear the table body.

$("#tblbody").html("");

How to get the next auto-increment id in mysql

You can get the next auto-increment value by doing:

SHOW TABLE STATUS FROM tablename LIKE Auto_increment
/*or*/
SELECT `auto_increment` FROM INFORMATION_SCHEMA.TABLES
WHERE table_name = 'tablename'

Note that you should not use this to alter the table, use an auto_increment column to do that automatically instead.
The problem is that last_insert_id() is retrospective and can thus be guaranteed within the current connection.
This baby is prospective and is therefore not unique per connection and cannot be relied upon.
Only in a single connection database would it work, but single connection databases today have a habit of becoming multiple connection databases tomorrow.

See: SHOW TABLE STATUS

Convert array to JSON

I made it that way:

if I have:

var jsonArg1 = new Object();
    jsonArg1.name = 'calc this';
    jsonArg1.value = 3.1415;
var jsonArg2 = new Object();
    jsonArg2.name = 'calc this again';
    jsonArg2.value = 2.73;

var pluginArrayArg = new Array();
    pluginArrayArg.push(jsonArg1);
    pluginArrayArg.push(jsonArg2);

to convert pluginArrayArg (which is pure javascript array) into JSON array:

var jsonArray = JSON.parse(JSON.stringify(pluginArrayArg))

Token Authentication vs. Cookies

A typical web app is mostly stateless, because of its request/response nature. The HTTP protocol is the best example of a stateless protocol. But since most web apps need state, in order to hold the state between server and client, cookies are used such that the server can send a cookie in every response back to the client. This means the next request made from the client will include this cookie and will thus be recognized by the server. This way the server can maintain a session with the stateless client, knowing mostly everything about the app's state, but stored in the server. In this scenario at no moment does the client hold state, which is not how Ember.js works.

In Ember.js things are different. Ember.js makes the programmer's job easier because it holds indeed the state for you, in the client, knowing at every moment about its state without having to make a request to the server asking for state data.

However, holding state in the client can also sometimes introduce concurrency issues that are simply not present in stateless situations. Ember.js, however, deals also with these issues for you; specifically ember-data is built with this in mind. In conclusion, Ember.js is a framework designed for stateful clients.

Ember.js does not work like a typical stateless web app where the session, the state and the corresponding cookies are handled almost completely by the server. Ember.js holds its state completely in Javascript (in the client's memory, and not in the DOM like some other frameworks) and does not need the server to manage the session. This results in Ember.js being more versatile in many situations, e.g. when your app is in offline mode.

Obviously, for security reasons, it does need some kind of token or unique key to be sent to the server everytime a request is made in order to be authenticated. This way the server can look up the send token (which was initially issued by the server) and verify if it's valid before sending a response back to the client.

In my opinion, the main reason why to use an authentication token instead of cookies as stated in Ember Auth FAQ is primarily because of the nature of the Ember.js framework and also because it fits more with the stateful web app paradigm. Therefore the cookie mechanism is not the best approach when building an Ember.js app.

I hope my answer will give more meaning to your question.

No 'Access-Control-Allow-Origin' header is present on the requested resource—when trying to get data from a REST API

In my case, web server prevented "OPTIONS" method

Check your web server for the options method

apache : https://www-01.ibm.com/support/docview.wss?uid=ibm10735209
webtier : 4.4.6 Disabling the Options Method https://docs.oracle.com/cd/E23943_01/web.1111/e10144/getstart.htm#HSADM174
nginx : https://medium.com/@hariomvashisth/cors-on-nginx-be38dd0e19df

I'm using "webtier"

/www/webtier/domains/[domainname]/config/fmwconfig/components/OHS/VCWeb1/httpd.conf

<IfModule mod_rewrite.c>
  RewriteEngine on
  RewriteCond %{REQUEST_METHOD} ^OPTIONS
  RewriteRule .* . [F]
</IfModule>

change to

<IfModule mod_rewrite.c>
  RewriteEngine off
  RewriteCond %{REQUEST_METHOD} ^OPTIONS
  RewriteRule .* . [F]
</IfModule>

Android Fragment onAttach() deprecated

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    Activity activity = context instanceof Activity ? (Activity) context : null;
}

PostgreSQL - fetch the row which has the Max value for a column

Actaully there's a hacky solution for this problem. Let's say you want to select the biggest tree of each forest in a region.

SELECT (array_agg(tree.id ORDER BY tree_size.size)))[1]
FROM tree JOIN forest ON (tree.forest = forest.id)
GROUP BY forest.id

When you group trees by forests there will be an unsorted list of trees and you need to find the biggest one. First thing you should do is to sort the rows by their sizes and select the first one of your list. It may seems inefficient but if you have millions of rows it will be quite faster than the solutions that includes JOIN's and WHERE conditions.

BTW, note that ORDER_BY for array_agg is introduced in Postgresql 9.0

Redirecting from HTTP to HTTPS with PHP

You can always use

header('Location: https://www.domain.com/cart_save/');

to redirect to the save URL.

But I would recommend to do it by .htaccess and the Apache rewrite rules.

PHP JSON String, escape Double Quotes for JS output

Use json_encode($json_array, JSON_HEX_QUOT); since php 5.3: http://php.net/manual/en/json.constants.php

Select current element in jQuery

To select the sibling, you'd need something like:

$(this).next();

So, Shog9's comment is not correct. First of all, you'd need to name the variable "clicked" outside of the div click function, otherwise, it is lost after the click occurs.

var clicked;

$("div a").click(function(){
   clicked = $(this).next();
   // Do what you need to do to the newly defined click here
});

// But you can also access the "clicked" element here

How to empty the content of a div

This method works best to me:

Element.prototype.remove = function() {
    this.parentElement.removeChild(this);
}
NodeList.prototype.remove = HTMLCollection.prototype.remove = function() {
    for(var i = this.length - 1; i >= 0; i--) {
        if(this[i] && this[i].parentElement) {
            this[i].parentElement.removeChild(this[i]);
        }
    }
}

To use it we can deploy like this:

document.getElementsByID('DIV_Id').remove();

document.getElementsByClassName('DIV_Class').remove();

Why I can't change directories using "cd"?

The cd in your script technically worked as it changed the directory of the shell that ran the script, but that was a separate process forked from your interactive shell.

A Posix-compatible way to solve this problem is to define a shell procedure rather than a shell-invoked command script.

jhome () {
  cd /home/tree/projects/java
}

You can just type this in or put it in one of the various shell startup files.

Add attribute 'checked' on click jquery

$( this ).attr( 'checked', 'checked' )

just attr( 'checked' ) will return the value of $( this )'s checked attribute. To set it, you need that second argument. Based on <input type="checkbox" checked="checked" />

Edit:

Based on comments, a more appropriate manipulation would be:

$( this ).attr( 'checked', true )

And a straight javascript method, more appropriate and efficient:

this.checked = true;

Thanks @Andy E for that.

When would you use the different git merge strategies?

I'm not familiar with resolve, but I've used the others:

Recursive

Recursive is the default for non-fast-forward merges. We're all familiar with that one.

Octopus

I've used octopus when I've had several trees that needed to be merged. You see this in larger projects where many branches have had independent development and it's all ready to come together into a single head.

An octopus branch merges multiple heads in one commit as long as it can do it cleanly.

For illustration, imagine you have a project that has a master, and then three branches to merge in (call them a, b, and c).

A series of recursive merges would look like this (note that the first merge was a fast-forward, as I didn't force recursion):

However, a single octopus merge would look like this:

commit ae632e99ba0ccd0e9e06d09e8647659220d043b9
Merge: f51262e... c9ce629... aa0f25d...

Ours

Ours == I want to pull in another head, but throw away all of the changes that head introduces.

This keeps the history of a branch without any of the effects of the branch.

(Read: It is not even looked at the changes between those branches. The branches are just merged and nothing is done to the files. If you want to merge in the other branch and every time there is the question "our file version or their version" you can use git merge -X ours)

Subtree

Subtree is useful when you want to merge in another project into a subdirectory of your current project. Useful when you have a library you don't want to include as a submodule.

Access-Control-Allow-Origin Multiple Origin Domains?

There is one disadvantage you should be aware of: As soon as you out-source files to a CDN (or any other server which doesn't allow scripting) or if your files are cached on a proxy, altering response based on 'Origin' request header will not work.

Android Bitmap to Base64 String

Try this, first scale your image to required width and height, just pass your original bitmap, required width and required height to the following method and get scaled bitmap in return:

For example: Bitmap scaledBitmap = getScaledBitmap(originalBitmap, 250, 350);

private Bitmap getScaledBitmap(Bitmap b, int reqWidth, int reqHeight)
{
    int bWidth = b.getWidth();
    int bHeight = b.getHeight();

    int nWidth = bWidth;
    int nHeight = bHeight;

    if(nWidth > reqWidth)
    {
        int ratio = bWidth / reqWidth;
        if(ratio > 0)
        {
            nWidth = reqWidth;
            nHeight = bHeight / ratio;
        }
    }

    if(nHeight > reqHeight)
    {
        int ratio = bHeight / reqHeight;
        if(ratio > 0)
        {
            nHeight = reqHeight;
            nWidth = bWidth / ratio;
        }
    }

    return Bitmap.createScaledBitmap(b, nWidth, nHeight, true);
}

Now just pass your scaled bitmap to the following method and get base64 string in return:

For example: String base64String = getBase64String(scaledBitmap);

private String getBase64String(Bitmap bitmap)
{
    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);

    byte[] imageBytes = baos.toByteArray();

    String base64String = Base64.encodeToString(imageBytes, Base64.NO_WRAP);

    return base64String;
}

To decode the base64 string back to bitmap image:

byte[] decodedByteArray = Base64.decode(base64String, Base64.NO_WRAP);
Bitmap decodedBitmap = BitmapFactory.decodeByteArray(decodedByteArray, 0, decodedString.length);

C++ passing an array pointer as a function argument

This is another method . Passing array as a pointer to the function
void generateArray(int *array,  int size) {
    srand(time(0));
    for (int j=0;j<size;j++)
        array[j]=(0+rand()%9);
}

int main(){
    const int size=5;
    int a[size];
    generateArray(a, size);
    return 0;
}

Embed an External Page Without an Iframe?

Question is good, but the answer is : it depends on that.

If the other webpage doesn't contain any form or text, for example you can use the CURL method to pickup the exact content and after then showing on your page. YOu can do it without using an iframe.

But, if the page what you want to embed contains for example a form it will not work correctly , because the form handling is on that site.

Is there a way to access an iteration-counter in Java's for-each loop?

For situations where I only need the index occasionally, like in a catch clause, I will sometimes use indexOf.

for(String s : stringArray) {
  try {
    doSomethingWith(s);
  } catch (Exception e) {
    LOGGER.warn("Had some kind of problem with string " +
      stringArray.indexOf(s) + ": " + s, e);
  }
}

Cannot create PoolableConnectionFactory (Io exception: The Network Adapter could not establish the connection)

I had the same error and ended up solving it by upgrading my Oracle ojdbc driver to a version compatible with the Oracle database version

How do you implement a class in C?

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <uchar.h>

/**
 * Define Shape class
 */
typedef struct Shape Shape;
struct Shape {
    /**
     * Variables header...
     */
    double width, height;

    /**
     * Functions header...
     */
    double (*area)(Shape *shape);
};

/**
 * Functions
 */
double calc(Shape *shape) {
        return shape->width * shape->height;
}

/**
 * Constructor
 */
Shape _Shape() {
    Shape s;

    s.width = 1;
    s.height = 1;

    s.area = calc;

    return s;
}

/********************************************/

int main() {
    Shape s1 = _Shape();
    s1.width = 5.35;
    s1.height = 12.5462;

    printf("Hello World\n\n");

    printf("User.width = %f\n", s1.width);
    printf("User.height = %f\n", s1.height);
    printf("User.area = %f\n\n", s1.area(&s1));

    printf("Made with \xe2\x99\xa5 \n");

    return 0;
};

Read lines from a text file but skip the first two lines

May be I am oversimplifying?

Just add the following code:

Open sFileName For Input as iFileNum
Line Input #iFileNum, dummy1
Line Input #iFileNum, dummy2
........

Sundar

Explicitly set column value to null SQL Developer

Use Shift+Del.

More info: Shift+Del combination key set a field to null when you filled a field by a value and you changed your decision and you want to make it null. It is useful and I amazed from the other answers that give strange solutions.

Xcode 6.1 Missing required architecture X86_64 in file

The first thing you should make sure is that your static library has all architectures. When you do a lipo -info myStaticLibrary.a on terminal - you should see armv7 armv7s i386 x86_64 arm64 architectures for your fat binary.
To accomplish that, I am assuming that you're making a universal binary - add the following to your architecture settings of static library project -

enter image description here

So, you can see that I have to manually set the Standard architectures (including 64-bit) (armv7, armv7s, arm64) of the static library project.

enter image description here

Alternatively, since the normal $ARCHS_STANDARD now includes 64-bit. You can also do $(ARCHS_STANDARD) and armv7s. Check lipo -info without it, and you'll figure out the missing architectures. Here's the screenshot for all architectures -

enter image description here

For your reference implementation (project using static library). The default settings should work fine -

Update 12/03/14 Xcode 6 Standard architectures exclude armv7s.

So, armv7s is not needed? Yes. It seems that the general differences between armv7 and armv7s instruction sets are minor. So if you choose not to include armv7s, the targeted armv7 machine code still runs fine on 32 bit A6 devices, and hardly one will notice performance gap. Source

If there is a smarter way for Xcode 6.1+ (iOS 8.1 and above) - please share.

Use of PUT vs PATCH methods in REST API real life scenarios

TLDR - Dumbed Down Version

PUT => Set all new attributes for an existing resource.

PATCH => Partially update an existing resource (not all attributes required).

How to configure static content cache per folder and extension in IIS7?

You can do it on a per file basis. Use the path attribute to include the filename

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <location path="YourFileNameHere.xml">
        <system.webServer>
            <staticContent>
                <clientCache cacheControlMode="DisableCache" />
            </staticContent>
        </system.webServer>
    </location>
</configuration>

How do I use regex in a SQLite query?

UPDATE TableName
 SET YourField = ''
WHERE YourField REGEXP 'YOUR REGEX'

And :

SELECT * from TableName
 WHERE YourField REGEXP 'YOUR REGEX'

How do I insert a drop-down menu for a simple Windows Forms app in Visual Studio 2008?

You can use a ComboBox with its ComboBoxStyle (appears as DropDownStyle in later versions) set to DropDownList. See: http://msdn.microsoft.com/en-us/library/system.windows.forms.comboboxstyle.aspx

How to use absolute path in twig functions

From Symfony2 documentation: Absolute URLs for assets were introduced in Symfony 2.5.

If you need absolute URLs for assets, you can set the third argument (or the absolute argument) to true:

Example:

<img src="{{ asset('images/logo.png', absolute=true) }}" alt="Symfony!" />

log4j:WARN No appenders could be found for logger in web.xml

In my case the solution was easy. You don't need to declare anything in your web.xml.

Because your project is a web application, the config file should be on WEB-INF/classes after deployment. I advise you to create a Java resource folder (src/main/resources) to do that (best pratice). Another approach is to put the config file in your src/main/java.

Beware with the configuration file name. If you are using XML, the file name is log4j.xml, otherwise log4j.properties.

Returning a value from callback function in Node.js

I am facing small trouble in returning a value from callback function in Node.js

This is not a "small trouble", it is actually impossible to "return" a value in the traditional sense from an asynchronous function.

Since you cannot "return the value" you must call the function that will need the value once you have it. @display_name already answered your question, but I just wanted to point out that the return in doCall is not returning the value in the traditional way. You could write doCall as follow:

function doCall(urlToCall, callback) {
    urllib.request(urlToCall, { wd: 'nodejs' }, function (err, data, response) {                              
        var statusCode = response.statusCode;
        finalData = getResponseJson(statusCode, data.toString());
        // call the function that needs the value
        callback(finalData);
        // we are done
        return;
    });
}

Line callback(finalData); is what calls the function that needs the value that you got from the async function. But be aware that the return statement is used to indicate that the function ends here, but it does not mean that the value is returned to the caller (the caller already moved on.)

Can scrapy be used to scrape dynamic content from websites that are using AJAX?

Webkit based browsers (like Google Chrome or Safari) has built-in developer tools. In Chrome you can open it Menu->Tools->Developer Tools. The Network tab allows you to see all information about every request and response:

enter image description here

In the bottom of the picture you can see that I've filtered request down to XHR - these are requests made by javascript code.

Tip: log is cleared every time you load a page, at the bottom of the picture, the black dot button will preserve log.

After analyzing requests and responses you can simulate these requests from your web-crawler and extract valuable data. In many cases it will be easier to get your data than parsing HTML, because that data does not contain presentation logic and is formatted to be accessed by javascript code.

Firefox has similar extension, it is called firebug. Some will argue that firebug is even more powerful but I like the simplicity of webkit.

How to resize Image in Android?

//photo is bitmap image

Bitmap btm00 = Utils.getResizedBitmap(photo, 200, 200);

 setimage.setImageBitmap(btm00);

  And in Utils class :

public static Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
    int width = bm.getWidth();
    int height = bm.getHeight();
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;
    Matrix matrix = new Matrix();
    // RESIZE THE BIT MAP
    matrix.postScale(scaleWidth, scaleHeight);
    // RECREATE THE NEW BITMAP
    Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height,
            matrix, false);
    return resizedBitmap;
}

What is “the inverse side of the association” in a bidirectional JPA OneToMany/ManyToOne association?

The entity which has the table with foreign key in the database is the owning entity and the other table, being pointed at, is the inverse entity.

How to set default value for column of new created table from select statement in 11g

The reason is that CTAS (Create table as select) does not copy any metadata from the source to the target table, namely

no primary key
no foreign keys
no grants
no indexes
...

To achieve what you want, I'd either

use dbms_metadata.get_ddl to get the complete table structure, replace the table name with the new name, execute this statement, and do an INSERT afterward to copy the data
or keep using CTAS, extract the not null constraints for the source table from user_constraints and add them to the target table afterwards

Linq select object from list depending on objects attribute

Of course!

Use FirstOrDefault() to select the first object which matches the condition:

Answer answer = Answers.FirstOrDefault(a => a.Correct);

Otherwise use Where() to select a subset of your list:

var answers = Answers.Where(a => a.Correct);

How to execute mongo commands through shell scripts?

mongo db_name --eval "db.user_info.find().forEach(function(o) {print(o._id);})"

How to create a windows service from java app

it's simple as you have to put shortcut in

Windows 7 C:\users\All Users\Start Menu\Programs\Startup(Admin) or User home directory(%userProfile%)

Windows 10 : In Run shell:startup

in it's property -> shortcut -> target - > java.exe -jar D:\..\runJar.jar

NOTE: This will run only after you login

With Admin Right

sc create serviceName binpath= "java.exe -jar D:\..\runJar.jar" Will create windows service

if you get timeout use cmd /c D:\JAVA7~1\jdk1.7.0_51\bin\java.exe -jar d:\jenkins\jenkins.war but even with this you'll get timeout but in background java.exe will be started. Check in task manager

NOTE: This will run at windows logon start-up(before sign-in, Based on service 'Startup Type')

Detailed explanation of creating windows service

AngularJs .$setPristine to reset form

DavidLn's answer has worked well for me in the past. But it doesn't capture all of setPristine's functionality, which tripped me up this time. Here is a fuller shim:

var form_set_pristine = function(form){
    // 2013-12-20 DF TODO: remove this function on Angular 1.1.x+ upgrade
    // function is included natively

    if(form.$setPristine){
        form.$setPristine();
    } else {
        form.$pristine = true;
        form.$dirty = false;
        angular.forEach(form, function (input, key) {
            if (input.$pristine)
                input.$pristine = true;
            if (input.$dirty) {
                input.$dirty = false;
            }
        });
    }
};

How do I bind a WPF DataGrid to a variable number of columns?

I managed to make it possible to dynamically add a column using just a line of code like this:

MyItemsCollection.AddPropertyDescriptor(
    new DynamicPropertyDescriptor<User, int>("Age", x => x.Age));

Regarding to the question, this is not a XAML-based solution (since as mentioned there is no reasonable way to do it), neither it is a solution which would operate directly with DataGrid.Columns. It actually operates with DataGrid bound ItemsSource, which implements ITypedList and as such provides custom methods for PropertyDescriptor retrieval. In one place in code you can define "data rows" and "data columns" for your grid.

If you would have:

IList<string> ColumnNames { get; set; }
//dict.key is column name, dict.value is value
Dictionary<string, string> Rows { get; set; }

you could use for example:

var descriptors= new List<PropertyDescriptor>();
//retrieve column name from preprepared list or retrieve from one of the items in dictionary
foreach(var columnName in ColumnNames)
    descriptors.Add(new DynamicPropertyDescriptor<Dictionary, string>(ColumnName, x => x[columnName]))
MyItemsCollection = new DynamicDataGridSource(Rows, descriptors)

and your grid using binding to MyItemsCollection would be populated with corresponding columns. Those columns can be modified (new added or existing removed) at runtime dynamically and grid will automatically refresh it's columns collection.

DynamicPropertyDescriptor mentioned above is just an upgrade to regular PropertyDescriptor and provides strongly-typed columns definition with some additional options. DynamicDataGridSource would otherwise work just fine event with basic PropertyDescriptor.

Swift alert view with OK and Cancel: which button tapped?

If you are using iOS8, you should be using UIAlertController — UIAlertView is deprecated.

Here is an example of how to use it:

var refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.Alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
  print("Handle Ok logic here")
  }))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in
  print("Handle Cancel Logic here")
  }))

presentViewController(refreshAlert, animated: true, completion: nil)

As you can see the block handlers for the UIAlertAction handle the button presses. A great tutorial is here (although this tutorial is not written using swift): http://hayageek.com/uialertcontroller-example-ios/

Swift 3 update:

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
    print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
    print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

Swift 5 update:

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
      print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
      print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

Swift 5.3 update:

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertController.Style.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
      print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
      print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

How to show the text on a ImageButton?

Here is the solution

<LinearLayout
    android:id="@+id/buttons_line1"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <ImageButton
        android:id="@+id/btn_mute"
        android:src="@drawable/btn_mute"
        android:background="@drawable/circle_gray"
        android:layout_width="60dp"
        android:layout_height="60dp"/>
    <ImageButton
        android:id="@+id/btn_keypad"
        android:layout_marginLeft="50dp"
        android:src="@drawable/btn_dialpad"
        android:background="@drawable/circle_gray"
        android:layout_width="60dp"
        android:layout_height="60dp"/>
    <ImageButton
        android:id="@+id/btn_speaker"
        android:layout_marginLeft="50dp"
        android:src="@drawable/btn_speaker"
        android:background="@drawable/circle_gray"
        android:layout_width="60dp"
        android:layout_height="60dp"/>
</LinearLayout>
<LinearLayout
    android:layout_below="@+id/buttons_line1"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:layout_marginTop="10dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView
        android:text="mute"
        android:clickable="false"
        android:textAlignment="center"
        android:textColor="@color/Grey"
        android:layout_width="60dp"
        android:layout_height="wrap_content"/>
    <TextView
        android:text="keypad"
        android:clickable="false"
        android:layout_marginLeft="50dp"
        android:textAlignment="center"
        android:textColor="@color/Grey"
        android:layout_width="60dp"
        android:layout_height="wrap_content"/>
    <TextView
        android:text="speaker"
        android:clickable="false"
        android:layout_marginLeft="50dp"
        android:textAlignment="center"
        android:textColor="@color/Grey"
        android:layout_width="60dp"
        android:layout_height="wrap_content"/>
</LinearLayout>

Python: Number of rows affected by cursor.execute("SELECT ...)

when using count(*) the result is {'count(*)': 9}

-- where 9 represents the number of rows in the table, for the instance.

So, in order to fetch the just the number, this worked in my case, using mysql 8.

cursor.fetchone()['count(*)']

call javascript function onchange event of dropdown list

Your code is working just fine, you have to declare javscript method before DOM ready.

your working example

Most pythonic way to delete a file which may not exist

A more pythonic way would be:

try:
    os.remove(filename)
except OSError:
    pass

Although this takes even more lines and looks very ugly, it avoids the unnecessary call to os.path.exists() and follows the python convention of overusing exceptions.

It may be worthwhile to write a function to do this for you:

import os, errno

def silentremove(filename):
    try:
        os.remove(filename)
    except OSError as e: # this would be "except OSError, e:" before Python 2.6
        if e.errno != errno.ENOENT: # errno.ENOENT = no such file or directory
            raise # re-raise exception if a different error occurred

Composer: file_put_contents(./composer.json): failed to open stream: Permission denied

For me, in Ubuntu 18.04. I needed to chown inside ~/.config/composer/

E.g.

sudo chown -R $USER ~/.config/composer

Then global commands work.

Binding a WPF ComboBox to a custom list

I had what at first seemed to be an identical problem, but it turned out to be due to an NHibernate/WPF compatibility issue. The problem was caused by the way WPF checks for object equality. I was able to get my stuff to work by using the object ID property in the SelectedValue and SelectedValuePath properties.

<ComboBox Name="CategoryList"
          DisplayMemberPath="CategoryName"
          SelectedItem="{Binding Path=CategoryParent}"
          SelectedValue="{Binding Path=CategoryParent.ID}"
          SelectedValuePath="ID">

See the blog post from Chester, The WPF ComboBox - SelectedItem, SelectedValue, and SelectedValuePath with NHibernate, for details.

What are the ways to sum matrix elements in MATLAB?

For very large matrices using sum(sum(A)) can be faster than sum(A(:)):

>> A = rand(20000);
>> tic; B=sum(A(:)); toc; tic; C=sum(sum(A)); toc
Elapsed time is 0.407980 seconds.
Elapsed time is 0.322624 seconds.

'printf' vs. 'cout' in C++

Two points not otherwise mentioned here that I find significant:

1) cout carries a lot of baggage if you're not already using the STL. It adds over twice as much code to your object file as printf. This is also true for string, and this is the major reason I tend to use my own string library.

2) cout uses overloaded << operators, which I find unfortunate. This can add confusion if you're also using the << operator for its intended purpose (shift left). I personally don't like to overload operators for purposes tangential to their intended use.

Bottom line: I'll use cout (and string) if I'm already using the STL. Otherwise, I tend to avoid it.

What causes java.lang.IncompatibleClassChangeError?

If this is a record of possible occurences of this error then:

I just got this error on WAS (8.5.0.1), during the CXF (2.6.0) loading of the spring (3.1.1_release) configuration where a BeanInstantiationException rolled up a CXF ExtensionException, rolling up a IncompatibleClassChangeError. The following snippet shows the gist of the stack trace:

Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.apache.cxf.bus.spring.SpringBus]: Constructor threw exception; nested exception is org.apache.cxf.bus.extension.ExtensionException
            at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)
            at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:76)
            at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:990)
            ... 116 more
Caused by: org.apache.cxf.bus.extension.ExtensionException
            at org.apache.cxf.bus.extension.Extension.tryClass(Extension.java:167)
            at org.apache.cxf.bus.extension.Extension.getClassObject(Extension.java:179)
            at org.apache.cxf.bus.extension.ExtensionManagerImpl.activateAllByType(ExtensionManagerImpl.java:138)
            at org.apache.cxf.bus.extension.ExtensionManagerBus.<init>(ExtensionManagerBus.java:131)
            [etc...]
            at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
            ... 118 more

Caused by: java.lang.IncompatibleClassChangeError: 
org.apache.neethi.AssertionBuilderFactory
            at java.lang.ClassLoader.defineClassImpl(Native Method)
            at java.lang.ClassLoader.defineClass(ClassLoader.java:284)
            [etc...]
            at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:586)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:658)
            at org.apache.cxf.bus.extension.Extension.tryClass(Extension.java:163)
            ... 128 more

In this case, the solution was to change the classpath order of the module in my war file. That is, open up the war application in the WAS console under and select the client module(s). In the module configuration, set the class-loading to be "parent last".

This is found in the WAS console:

Applicatoins -> Application Types -> WebSphere Enterprise Applications
Click link representing your application (war)
Click "Manage Modules" under "Modules" section
Click link for the underlying module(s)
Change "Class loader order" to be "(parent last)".

Comparing Class Types in Java

As said earlier, your code will work unless you have the same classes loaded on two different class loaders. This might happen in case you need multiple versions of the same class in memory at the same time, or you are doing some weird on the fly compilation stuff (as I am).

In this case, if you want to consider these as the same class (which might be reasonable depending on the case), you can match their names to compare them.

public static boolean areClassesQuiteTheSame(Class<?> c1, Class<?> c2) {
  // TODO handle nulls maybe?
  return c1.getCanonicalName().equals(c2.getCanonicalName());
}

Keep in mind that this comparison will do just what it does: compare class names; I don't think you will be able to cast from one version of a class to the other, and before looking into reflection, you might want to make sure there's a good reason for your classloader mess.

How can I use a custom font in Java?

If you include a font file (otf, ttf, etc.) in your package, you can use the font in your application via the method described here:

Oracle Java SE 6: java.awt.Font

There is a tutorial available from Oracle that shows this example:

try {
     GraphicsEnvironment ge = 
         GraphicsEnvironment.getLocalGraphicsEnvironment();
     ge.registerFont(Font.createFont(Font.TRUETYPE_FONT, new File("A.ttf")));
} catch (IOException|FontFormatException e) {
     //Handle exception
}

I would probably wrap this up in some sort of resource loader though as to not reload the file from the package every time you want to use it.

An answer more closely related to your original question would be to install the font as part of your application's installation process. That process will depend on the installation method you choose. If it's not a desktop app you'll have to look into the links provided.

How to run vbs as administrator from vbs?

`My vbs file path :

D:\QTP Practice\Driver\Testany.vbs'

objShell = CreateObject("Shell.Application")

objShell.ShellExecute "cmd.exe","/k echo test", "", "runas", 1

set x=createobject("wscript.shell")

wscript.sleep(2000)

x.sendkeys "CD\"&"{ENTER}"&"cd D:"&"{ENTER}"&"cd "&"QTP Practice\Driver"&"{ENTER}"&"Testany.vbs"&"{ENTER}"

--from google search and some tuning, working for me

Speed up rsync with Simultaneous/Concurrent File Transfers?

Updated answer (Jan 2020)

xargs is now the recommended tool to achieve parallel execution. It's pre-installed almost everywhere. For running multiple rsync tasks the command would be:

ls /srv/mail | xargs -n1 -P4 -I% rsync -Pa % myserver.com:/srv/mail/

This will list all folders in /srv/mail, pipe them to xargs, which will read them one-by-one and and run 4 rsync processes at a time. The % char replaces the input argument for each command call.

Original answer using parallel:

ls /srv/mail | parallel -v -j8 rsync -raz --progress {} myserver.com:/srv/mail/{}

How can I access localhost from another computer in the same network?

You need to find what your local network's IP of that computer is. Then other people can access to your site by that IP.

You can find your local network's IP by go to Command Prompt or press Windows + R then type in ipconfig. It will give out some information and your local IP should look like 192.168.1.x.

Confused about UPDLOCK, HOLDLOCK

UPDLOCK is used when you want to lock a row or rows during a select statement for a future update statement. The future update might be the very next statement in the transaction.

Other sessions can still see the data. They just cannot obtain locks that are incompatiable with the UPDLOCK and/or HOLDLOCK.

You use UPDLOCK when you wan to keep other sessions from changing the rows you have locked. It restricts their ability to update or delete locked rows.

You use HOLDLOCK when you want to keep other sessions from changing any of the data you are looking at. It restricts their ability to insert, update, or delete the rows you have locked. This allows you to run the query again and see the same results.

c++ exception : throwing std::string

All these work:

#include <iostream>
using namespace std;

//Good, because manual memory management isn't needed and this uses
//less heap memory (or no heap memory) so this is safer if
//used in a low memory situation
void f() { throw string("foo"); }

//Valid, but avoid manual memory management if there's no reason to use it
void g() { throw new string("foo"); }

//Best.  Just a pointer to a string literal, so no allocation is needed,
//saving on cleanup, and removing a chance for an allocation to fail.
void h() { throw "foo"; }

int main() {
  try { f(); } catch (string s) { cout << s << endl; }
  try { g(); } catch (string* s) { cout << *s << endl; delete s; }
  try { h(); } catch (const char* s) { cout << s << endl; }
  return 0;
}

You should prefer h to f to g. Note that in the least preferable option you need to free the memory explicitly.

jQuery: Check if special characters exists in string

var specialChars = "<>@!#$%^&*()_+[]{}?:;|'\"\\,./~`-="
var check = function(string){
    for(i = 0; i < specialChars.length;i++){
        if(string.indexOf(specialChars[i]) > -1){
            return true
        }
    }
    return false;
}

if(check($('#Search').val()) == false){
    // Code that needs to execute when none of the above is in the string
}else{
    alert('Your search string contains illegal characters.');
}

getting integer values from textfield

As You're getting values from textfield as jTextField3.getText();.

As it is a textField it will return you string format as its format says:

String getText()

      Returns the text contained in this TextComponent.

So, convert your String to Integer as:

int jml = Integer.parseInt(jTextField3.getText());

instead of directly setting

   int jml = jTextField3.getText();

Show dialog from fragment?

 public void showAlert(){


     AlertDialog.Builder alertDialog = new AlertDialog.Builder(getActivity());
     LayoutInflater inflater = getActivity().getLayoutInflater();
     View alertDialogView = inflater.inflate(R.layout.test_dialog, null);
     alertDialog.setView(alertDialogView);

     TextView textDialog = (TextView) alertDialogView.findViewById(R.id.text_testDialogMsg);
     textDialog.setText(questionMissing);

     alertDialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
         public void onClick(DialogInterface dialog, int which) {
             dialog.cancel();
         }
     });
     alertDialog.show();

}

where .test_dialog is of xml custom

Check if decimal value is null

A decimal will always have some default value. If you need to have a nullable type decimal, you can use decimal?. Then you can do myDecimal.HasValue

Creating a file only if it doesn't exist in Node.js

Todo this in a single system call you can use the fs-extra npm module. After this the file will have been created as well as the directory it is to be placed in.

const fs = require('fs-extra');
const file = '/tmp/this/path/does/not/exist/file.txt'
fs.ensureFile(file, err => {
    console.log(err) // => null
});

Another way is to use ensureFileSync which will do the same thing but synchronous.

const fs = require('fs-extra');
const file = '/tmp/this/path/does/not/exist/file.txt'
fs.ensureFileSync(file)

cURL POST command line on WINDOWS RESTful service

Another Alternative for the command line that is easier than fighting with quotation marks is to put the json into a file, and use the @ prefix of curl parameters, e.g. with the following in json.txt:

{ "syncheader" : {
    "servertimesync" : "20131126121749",
    "deviceid" : "testDevice"
  }
}

then in my case I issue:

curl localhost:9000/sync -H "Content-type:application/json" -X POST -d @json.txt

Keeps the json more readable too.

Algorithm to randomly generate an aesthetically-pleasing color palette

You could average the RGB values of random colors with those of a constant color:

(example in Java)

public Color generateRandomColor(Color mix) {
    Random random = new Random();
    int red = random.nextInt(256);
    int green = random.nextInt(256);
    int blue = random.nextInt(256);

    // mix the color
    if (mix != null) {
        red = (red + mix.getRed()) / 2;
        green = (green + mix.getGreen()) / 2;
        blue = (blue + mix.getBlue()) / 2;
    }

    Color color = new Color(red, green, blue);
    return color;
}

Mixing random colors with white (255, 255, 255) creates neutral pastels by increasing the lightness while keeping the hue of the original color. These randomly generated pastels usually go well together, especially in large numbers.

Here are some pastel colors generated using the above method:

First

You could also mix the random color with a constant pastel, which results in a tinted set of neutral colors. For example, using a light blue creates colors like these:

Second

Going further, you could add heuristics to your generator that take into account complementary colors or levels of shading, but it all depends on the impression you want to achieve with your random colors.

Some additional resources:

Laravel 5.2 - Use a String as a Custom Primary Key for Eloquent Table becomes 0

This was added to the upgrade documentation on Dec 29, 2015, so if you upgraded before then you probably missed it.

When fetching any attribute from the model it checks if that column should be cast as an integer, string, etc.

By default, for auto-incrementing tables, the ID is assumed to be an integer in this method:

https://github.com/laravel/framework/blob/5.2/src/Illuminate/Database/Eloquent/Model.php#L2790

So the solution is:

class UserVerification extends Model
{
    protected $primaryKey = 'your_key_name'; // or null

    public $incrementing = false;

    // In Laravel 6.0+ make sure to also set $keyType
    protected $keyType = 'string';
}

Copy files without overwrite

I just want to clarify something from my own testing.

@Hydrargyrum wrote:

/XN excludes existing files newer than the copy in the source directory. Robocopy normally overwrites those.
/XO excludes existing files older than the copy in the source directory. Robocopy normally overwrites those.

This is actually backwards. XN does "eXclude Newer" files but it excludes files that are newer than the copy in the destination directory. XO does "eXclude Older", but it excludes files that are older than the copy in the destination directory.

Of course do your own testing as always.

Fill SVG path element with a background-image

You can do it by making the background into a pattern:

<defs>
  <pattern id="img1" patternUnits="userSpaceOnUse" width="100" height="100">
    <image href="wall.jpg" x="0" y="0" width="100" height="100" />
  </pattern>
</defs>

Adjust the width and height according to your image, then reference it from the path like this:

<path d="M5,50
         l0,100 l100,0 l0,-100 l-100,0
         M215,100
         a50,50 0 1 1 -100,0 50,50 0 1 1 100,0
         M265,50
         l50,100 l-100,0 l50,-100
         z"
  fill="url(#img1)" />

Working example

What is a View in Oracle?

A View in Oracle and in other database systems is simply the representation of a SQL statement that is stored in memory so that it can easily be re-used. For example, if we frequently issue the following query

SELECT customerid, customername FROM customers WHERE countryid='US';

To create a view use the CREATE VIEW command as seen in this example

CREATE VIEW view_uscustomers
AS
SELECT customerid, customername FROM customers WHERE countryid='US';

This command creates a new view called view_uscustomers. Note that this command does not result in anything being actually stored in the database at all except for a data dictionary entry that defines this view. This means that every time you query this view, Oracle has to go out and execute the view and query the database data. We can query the view like this:

SELECT * FROM view_uscustomers WHERE customerid BETWEEN 100 AND 200;

And Oracle will transform the query into this:

SELECT * 
FROM (select customerid, customername from customers WHERE countryid='US') 
WHERE customerid BETWEEN 100 AND 200

Benefits of using Views

Commonality of code being used. Since a view is based on one common set of SQL, this means that when it is called it’s less likely to require parsing.
Security. Views have long been used to hide the tables that actually contain the data you are querying. Also, views can be used to restrict the columns that a given user has access to.
Predicate pushing

You can find advanced topics in this article about "How to Create and Manage Views in Oracle."

How do I fix an "Invalid license data. Reinstall is required." error in Visual C# 2010 Express?

My prolem: -VS works fine, but when I create new Solution Setup and Deployment it make Setup file but when I run this Setup file, it say: "Invalid license data. Reinstall is required." -subinacl do not work.

My PC: -OS:Windows 7 64bit. -Visual Studio 2012

My way: -Close Visual Studio -Run regedit. -Pull down HKEY_CLASSES_ROOT -Looking for Licenses -Right click on Licenses -> click Permissions... -> click Addvanced -> click User you want edit -> click Edit -> choose This key and subkey -> check all Allow: Full Control, Query Value, SetValue, Create Subkey, Enumerate Subkeys, Notyfy, Create Link, Delete, Write DAC, Write Owner, Read Control... -> check Apply these permissions to objects... -> click OK -> click OK -> click OK -> Close Registry Edit -Start VS -Hope this help

How to return a value from pthread threads in C?

if you're uncomfortable with returning addresses and have just a single variable eg. an integer value to return, you can even typecast it into (void *) before passing it, and then when you collect it in the main, again typecast it into (int). You have the value without throwing up ugly warnings.

Why does ASP.NET webforms need the Runat="Server" attribute?

HTML elements in ASP.NET files are, by default, treated as text. To make these elements programmable, add a runat="server" attribute to the HTML element. This attribute indicates that the element should be treated as a server control.

Read MS Exchange email in C#

The currently preferred (Exchange 2013 and 2016) API is EWS. It is purely HTTP based and can be accessed from any language, but there are .Net and Java specific libraries.

You can use EWSEditor to play with the API.
Extended MAPI. This is the native API used by Outlook. It ends up using the MSEMS Exchange MAPI provider, which can talk to Exchange using RPC (Exchange 2013 no longer supports it) or RPC-over-HTTP (Exchange 2007 or newer) or MAPI-over-HTTP (Exchange 2013 and newer).

The API itself can only be accessed from unmanaged C++ or Delphi. You can also use Redemption (any language) - its RDO family of objects is an Extended MAPI wrapper. To use Extended MAPI, you need to install either Outlook or the standalone (Exchange) version of MAPI (on extended support, and it does not support Unicode PST and MSG files and cannot access Exchange 2016). Extended MAPI can be used in a service.

You can play with the API using OutlookSpy or MFCMAPI.
Outlook Object Model - not Exchange specific, but it allows access to all data available in Outlook on the machine where the code runs. Cannot be used in a service.
Exchange Active Sync. Microsoft no longer invests any significant resources into this protocol.
Outlook used to install CDO 1.21 library (it wraps Extended MAPI), but it had been deprecated by Microsoft and no longer receives any updates.
There used to be a third-party .Net MAPI wrapper called MAPI33, but it is no longer being developed or supported.
WebDAV - deprecated.
Collaborative Data Objects for Exchange (CDOEX) - deprecated.
Exchange OLE DB Provider (EXOLEDB) - deprecated.

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