Add Favicon to Website

This is not done in PHP. It's part of the <head> tags in a HTML page.
That icon is called a favicon. According to Wikipedia:

A favicon (short for favorites icon), also known as a shortcut icon, website icon, URL icon, or bookmark icon is a 16×16 or 32×32 pixel square icon associated with a particular website or webpage.
Adding it is easy. Just add an .ico image file that is either 16x16 pixels or 32x32 pixels. Then, in the web pages, add <link rel="shortcut icon" href="favicon.ico" type="image/x-icon"> to the <head> element.
You can easily generate favicons here.

Command to change the default home directory of a user

You can do it with:

/etc/passwd

Edit the user home directory and then move the required files and directories to it:

cp/mv -r /home/$user/.bash* /home/newdir

.bash_profile
.ssh/

Set the correct permission

chmod -R $user:$user /home/newdir/.bash*

Converting integer to binary in python

`numpy.binary_repr(num, width=None)` has a magic width argument

Relevant examples from the documentation linked above:

>>> np.binary_repr(3, width=4)
'0011'
The two’s complement is returned when the input number is negative and width is specified:
>>> np.binary_repr(-3, width=5)
'11101'

How can I get the iOS 7 default blue color programmatically?

The UIWindow.tintColor method wasn't working for me in iOS8 (it was still black), so I had to do this:

let b = UIButton.buttonWithType(UIButtonType.System) as UIButton
var color = b.titleColorForState(.Normal)

This gave the proper blue tint seen in a UIBarButtonItem

java.rmi.ConnectException: Connection refused to host: 127.0.1.1;

I had the same exact problem and my issue was that I had 2 IP addresses from 2 different networks configured in the etc/hosts as below.

10.xxx.x.xxx    localhost
192.xxx.x.xxx   localhost

This should be because there was a conflict as to which IP to be used for the other devices to reach the rmiregistry over the network.

Once I removed the extra-record that is not required, I was able to solve the issue.

So my etc/hosts file had only the following record.

10.xxx.x.xxx    localhost

How to stop and restart memcached server?

As root on CentOS 7:

systemctl start memcached
systemctl stop memcached
systemctl restart memcached

To tell the service to start at reboot (ex chkconfig):

systemctl enable memcached

To tell the service to not start at reboot:

systemctl disable memcached

Add days to JavaScript Date

Thanks Jason for your answer that works as expected, here is a mix from your code and the handy format of AnthonyWJones :

Date.prototype.addDays = function(days){
    var ms = new Date().getTime() + (86400000 * days);
    var added = new Date(ms);
    return added;
}

Pandas percentage of total with groupby

I realize there are already good answers here.

I nevertheless would like to contribute my own, because I feel for an elementary, simple question like this, there should be a short solution that is understandable at a glance.

It should also work in a way that I can add the percentages as a new column, leaving the rest of the dataframe untouched. Last but not least, it should generalize in an obvious way to the case in which there is more than one grouping level (e.g., state and country instead of only state).

The following snippet fulfills these criteria:

df['sales_ratio'] = df.groupby(['state'])['sales'].transform(lambda x: x/x.sum())

Note that if you're still using Python 2, you'll have to replace the x in the denominator of the lambda term by float(x).

Iterate over a Javascript associative array in sorted order

you could even prototype it onto object:

Object.prototype.iterateSorted = function(worker)
{
    var keys = [];
    for (var key in this)
    {
        if (this.hasOwnProperty(key))
            keys.push(key);
    }
    keys.sort();

    for (var i = 0; i < keys.length; i++)
    {
        worker(this[ keys[i] ]);
    }
}

and the usage:

var myObj = { a:1, b:2 };
myObj.iterateSorted(function(value)
{
    alert(value);
}

How to get a value from a Pandas DataFrame and not the index and object type

Use the values attribute to return the values as a np array and then use [0] to get the first value:

In [4]:
df.loc[df.Letters=='C','Letters'].values[0]

Out[4]:
'C'

EDIT

I personally prefer to access the columns using subscript operators:

df.loc[df['Letters'] == 'C', 'Letters'].values[0]

This avoids issues where the column names can have spaces or dashes - which mean that accessing using ..

C Program to find day of week given date

For Day of Week, years 2000 - 2099.

uint8_t rtc_DayOfWeek(uint8_t year, uint8_t month, uint8_t day)
{
    //static const uint8_t month_offset_table[] = {0, 3, 3, 6, 1, 4, 6, 2, 5, 0, 3, 5}; // Typical table.

    // Added 1 to Jan, Feb. Subtracted 1 from each instead of adding 6 in calc below.

    static const uint8_t month_offset_table[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};

    // Year is 0 - 99, representing years 2000 - 2099

    // Month starts at 0.

    // Day starts at 1.

    // Subtract 1 in calc for Jan, Feb, only in leap years.
    // Subtracting 1 from year has the effect of subtracting 2 in leap years, subtracting 1 otherwise.
    // Adding 1 for Jan, Feb in Month Table so calc ends up subtracting 1 for Jan, Feb, only in leap years.
    // All of this complication to avoid the check if it is a leap year.
    if (month < 2) {
        year--;
    }

    // Century constant is 6. Subtract 1 from Month Table, so difference is 7.

    // Sunday (0), Monday (1) ...

    return (day + month_offset_table[month] + year + (year >> 2)) % 7;

} /* end rtc_DayOfWeek() */

CSS: How to change colour of active navigation page menu

I think you are getting confused about what the a:active CSS selector does. This will only change the colour of your link when you click it (and only for the duration of the click i.e. how long your mouse button stays down). What you need to do is introduce a new class e.g. .selected into your CSS and when you select a link, update the selected menu item with new class e.g.

<div class="menuBar">
    <ul>
        <li class="selected"><a href="index.php">HOME</a></li>
        <li><a href="two.php">PORTFOLIO</a></li>
        ....
    </ul>
</div>

// specific CSS for your menu
div.menuBar li.selected a { color: #FF0000; } 
// more general CSS
li.selected a { color: #FF0000; }

You will need to update your template page to take in a selectedPage parameter.

Full path from file input using jQuery

You can't: It's a security feature in all modern browsers.

For IE8, it's off by default, but can be reactivated using a security setting:

When a file is selected by using the input type=file object, the value of the value property depends on the value of the "Include local directory path when uploading files to a server" security setting for the security zone used to display the Web page containing the input object.

The fully qualified filename of the selected file is returned only when this setting is enabled. When the setting is disabled, Internet Explorer 8 replaces the local drive and directory path with the string C:\fakepath\ in order to prevent inappropriate information disclosure.

In all other current mainstream browsers I know of, it is also turned off. The file name is the best you can get.

More detailed info and good links in this question. It refers to getting the value server-side, but the issue is the same in JavaScript before the form's submission.

java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener

This is surely Eclipse related issue. The thing which worked for me is creating a new server in eclipse server tab. Then run your application in this new server, it should work.

compare two files in UNIX

I got the solution by using comm

comm -23 file1 file2

will give you the desired output.

The files need to be sorted first anyway.

Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object

By mistake i tried to import Container and Content from react-native instead of native-base.

Error because of this line:

import { ActivityIndicator, RefreshControl,  StyleSheet, View, Keyboard, Container, Content } from 'react-native';

Below is the code fix:

import { ActivityIndicator, RefreshControl,  StyleSheet, View, Keyboard } from 'react-native';
import { Container, Content} from 'native-base';

What exactly does numpy.exp() do?

exp(x) = e^x where e= 2.718281(approx)

import numpy as np

ar=np.array([1,2,3])
ar=np.exp(ar)
print ar

outputs:

[ 2.71828183  7.3890561  20.08553692]

Comparison of DES, Triple DES, AES, blowfish encryption for data

AES is a symmetric cryptographic algorithm, while RSA is an asymmetric (or public key) cryptographic algorithm. Encryption and decryption is done with a single key in AES, while you use separate keys (public and private keys) in RSA. The strength of a 128-bit AES key is roughly equivalent to 2600-bits RSA key.

How to implement and do OCR in a C# project?

Here's one: (check out http://hongouru.blogspot.ie/2011/09/c-ocr-optical-character-recognition.html or http://www.codeproject.com/Articles/41709/How-To-Use-Office-2007-OCR-Using-C for more info)

using MODI;
static void Main(string[] args)
{
    DocumentClass myDoc = new DocumentClass();
    myDoc.Create(@"theDocumentName.tiff"); //we work with the .tiff extension
    myDoc.OCR(MiLANGUAGES.miLANG_ENGLISH, true, true);

    foreach (Image anImage in myDoc.Images)
    {
        Console.WriteLine(anImage.Layout.Text); //here we cout to the console.
    }
}

ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error

Your log indicates ClientAbortException, which occurs when your HTTP client drops the connection with the server and this happened before server could close the server socket Connection.

Postman: How to make multiple requests at the same time

Not sure if people are still looking for simple solutions to this, but you are able to run multiple instances of the "Collection Runner" in Postman. Just create a runner with some requests and click the "Run" button multiple times to bring up multiple instances.

Getting multiple values with scanf()

Yes.

int minx, miny, maxx,maxy;
do {
   printf("enter four integers: ");
} while (scanf("%d %d %d %d", &minx, &miny, &maxx, &maxy)!=4);

The loop is just to demonstrate that scanf returns the number of fields succesfully read (or EOF).

Sending and Receiving SMS and MMS in Android (pre Kit Kat Android 4.4)

I dont think there is any sdk support for sending mms in android. Look here Atleast I havent found yet. But a guy claimed to have it. Have a look at this post.

Send MMS from My application in android

Are there constants in JavaScript?

The const keyword is in the ECMAScript 6 draft but it thus far only enjoys a smattering of browser support: http://kangax.github.io/compat-table/es6/. The syntax is:

const CONSTANT_NAME = 0;

How to create a JPA query with LEFT OUTER JOIN

Write this;

 SELECT f from Student f LEFT JOIN f.classTbls s WHERE s.ClassName = 'abc'

Because your Student entity has One To Many relationship with ClassTbl entity.

How to make the 'cut' command treat same sequental delimiters as one?

Try:

tr -s ' ' <text.txt | cut -d ' ' -f4

From the tr man page:

-s, --squeeze-repeats   replace each input sequence of a repeated character
                        that is listed in SET1 with a single occurrence
                        of that character

Test or check if sheet exists

Some folk dislike this approach because of an "inappropriate" use of error handling, but I think it's considered acceptable in VBA... An alternative approach is to loop though all the sheets until you find a match.

Function WorksheetExists(shtName As String, Optional wb As Workbook) As Boolean
    Dim sht As Worksheet

    If wb Is Nothing Then Set wb = ThisWorkbook
    On Error Resume Next
    Set sht = wb.Sheets(shtName)
    On Error GoTo 0
    WorksheetExists = Not sht Is Nothing
End Function

How to match a substring in a string, ignoring case

There's another post here. Try looking at this.

BTW, you're looking for the .lower() method:

string1 = "hi"
string2 = "HI"
if string1.lower() == string2.lower():
    print "Equals!"
else:
    print "Different!"

SQL Server: IF EXISTS ; ELSE

EDIT

I want to add the reason that your IF statement seems to not work. When you do an EXISTS on an aggregate, it's always going to be true. It returns a value even if the ID doesn't exist. Sure, it's NULL, but its returning it. Instead, do this:

if exists(select 1 from table where id = 4)

and you'll get to the ELSE portion of your IF statement.

Now, here's a better, set-based solution:

update b
  set code = isnull(a.value, 123)
from #b b
left join (select id, max(value) from #a group by id) a
  on b.id = a.id
where
  b.id = yourid

This has the benefit of being able to run on the entire table rather than individual ids.

Closing a Userform with Unload Me doesn't work

It should also be noted that if you have buttons grouped together on your user form that it can link it to a different button in the group despite the one you intended being clicked.

What is a daemon thread in Java?

Let's talk only in code with working examples. I like russ's answer above but to remove any doubt I had, I enhanced it a little bit. I ran it twice, once with the worker thread set to deamon true (deamon thread) and another time set it to false (user thread). It confirms that the deamon thread ends when the main thread terminates.

public class DeamonThreadTest {

public static void main(String[] args) {

    new WorkerThread(false).start();    //set it to true and false and run twice.

    try {
        Thread.sleep(7500);
    } catch (InterruptedException e) {
        // handle here exception
    }

    System.out.println("Main Thread ending");
    }
   }

   class WorkerThread extends Thread {

    boolean isDeamon;

    public WorkerThread(boolean isDeamon) {
        // When false, (i.e. when it's a user thread),
        // the Worker thread continues to run.
        // When true, (i.e. when it's a daemon thread),
        // the Worker thread terminates when the main
        // thread terminates.
        this.isDeamon = isDeamon;
        setDaemon(isDeamon);
    }

    public void run() {
        System.out.println("I am a " + (isDeamon ? "Deamon Thread" : "User Thread (none-deamon)"));

        int counter = 0;

        while (counter < 10) {
            counter++;
            System.out.println("\tworking from Worker thread " + counter++);

            try {
                sleep(5000);
            } catch (InterruptedException e) {
                // handle exception here
            }
        }
        System.out.println("\tWorker thread ends. ");
    }
}



result when setDeamon(true)
=====================================
I am a Deamon Thread
    working from Worker thread 0
    working from Worker thread 1
Main Thread ending

Process finished with exit code 0


result when setDeamon(false)
=====================================
I am a User Thread (none-deamon)
    working from Worker thread 0
    working from Worker thread 1
Main Thread ending
    working from Worker thread 2
    working from Worker thread 3
    working from Worker thread 4
    working from Worker thread 5
    working from Worker thread 6
    working from Worker thread 7
    working from Worker thread 8
    working from Worker thread 9
    Worker thread ends. 

Process finished with exit code 0

JAX-RS / Jersey how to customize error handling?

There are several approaches to customize the error handling behavior with JAX-RS. Here are three of the easier ways.

The first approach is to create an Exception class that extends WebApplicationException.

Example:

public class NotAuthorizedException extends WebApplicationException {
     public NotAuthorizedException(String message) {
         super(Response.status(Response.Status.UNAUTHORIZED)
             .entity(message).type(MediaType.TEXT_PLAIN).build());
     }
}

And to throw this newly create Exception you simply:

@Path("accounts/{accountId}/")
    public Item getItem(@PathParam("accountId") String accountId) {
       // An unauthorized user tries to enter
       throw new NotAuthorizedException("You Don't Have Permission");
}

Notice, you don't need to declare the exception in a throws clause because WebApplicationException is a runtime Exception. This will return a 401 response to the client.

The second and easier approach is to simply construct an instance of the WebApplicationException directly in your code. This approach works as long as you don't have to implement your own application Exceptions.

Example:

@Path("accounts/{accountId}/")
public Item getItem(@PathParam("accountId") String accountId) {
   // An unauthorized user tries to enter
   throw new WebApplicationException(Response.Status.UNAUTHORIZED);
}

This code too returns a 401 to the client.

Of course, this is just a simple example. You can make the Exception much more complex if necessary, and you can generate what ever http response code you need to.

One other approach is to wrap an existing Exception, perhaps an ObjectNotFoundException with an small wrapper class that implements the ExceptionMapper interface annotated with a @Provider annotation. This tells the JAX-RS runtime, that if the wrapped Exception is raised, return the response code defined in the ExceptionMapper.

Nothing was returned from render. This usually means a return statement is missing. Or, to render nothing, return null

I ran into this error when running Jest tests. One of the components was being mocked in the setup file, so when I attempted to use the actual component in a test, I was getting very unexpected results.

jest.mock("components/MyComponent", () => ({ children }) => children);

Removing this mock (which wasn't actually needed) fixed my issue immediately.

Perhaps this will save you a few hours of research when you know you're returning from your component correctly.

how to specify new environment location for conda create

If you want to use the --prefix or -p arguments, but want to avoid having to use the environment's full path to activate it, you need to edit the .condarc config file before you create the environment.

The .condarc file is in the home directory; C:\Users\<user> on Windows. Edit the values under the envs_dirs key to include the custom path for your environment. Assuming the custom path is D:\envs, the file should end up looking something like this:

ssl_verify: true
channels:
  - defaults
envs_dirs:
  - C:\Users\<user>\Anaconda3\envs
  - D:\envs

Then, when you create a new environment on that path, its name will appear along with the path when you run conda env list, and you should be able to activate it using only the name, and not the full path.

Command line screenshot

In summary, if you edit .condarc to include D:\envs, and then run conda env create -p D:\envs\myenv python=x.x, then activate myenv (or source activate myenv on Linux) should work.

Hope that helps!

P.S. I stumbled upon this through trial and error. I think what happens is when you edit the envs_dirs key, conda updates ~\.conda\environments.txt to include the environments found in all the directories specified under the envs_dirs, so they can be accessed without using absolute paths.

Curl not recognized as an internal or external command, operable program or batch file

Method 1:\

add "C:\Program Files\cURL\bin" path into system variables Path right-click My Computer and click Properties >advanced > Environment Variables

Method 2: (if method 1 not work then)

simple open command prompt with "run as administrator"

HTML Image not displaying, while the src url works

My images were not getting displayed even after putting them in the correct folder, problem was they did not have the right permission, I changed the permission to read write execute. I used chmod 777 image.png. All worked then, images were getting displayed. :)

Check if process returns 0 with batch file

To check whether a process/command returned 0 or not, use the operators && == 0 or not == 0 ||:

Just add operator to your script:

execute_command && (

       echo\Return 0, with no execution error
) || (
        echo\Return non 0, something went wrong
     )

command && echo\Return 0 || echo\Return non 0

For details on Operators' behavior see: Conditional Execution || && ...

How to copy and paste code without rich text formatting?

From websites, using Firefox, I use the CopyPlainText extension.

How do I convert speech to text?

Dragon NaturallySpeaking seems to support MP3 input.

If you want an open source version (I think there are some Asterisk integration projects based on this one).

How to add background-image using ngStyle (angular2)?

You can use 2 methods:

Method 1

<div [ngStyle]="{'background-image': 'url(&quot;' + photo + '&quot;)'}"></div>

Method 2

<div [style.background-image]="'url(&quot;' + photo + '&quot;)'"></div>

Note: it is important to surround the URL with " char.

How to get the changes on a branch in Git

Similar to several answers like Alex V's and NDavis, but none of them are quite the same.

When already in the branch in question

Using:

git diff master...

Which combines several features:

it's super short
shows the actual changes

Update:

This should probably be git diff master, but also this shows the diff, not the commits as the question specified.

$_SERVER['HTTP_REFERER'] missing

Referer is not a compulsory header. It may or may not be there or could be modified/fictitious. Rely on it at your own risk. Anyways, you should wrap your call so you do not get an undefined index error:

$server = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : "";

Get current url in Angular

You can make use of location service available in @angular/common and via this below code you can get the location or current URL

import { Component, OnInit } from '@angular/core';
import { Location } from '@angular/common';
import { Router } from '@angular/router';

@Component({
  selector: 'app-top-nav',
  templateUrl: './top-nav.component.html',
  styleUrls: ['./top-nav.component.scss']
})
export class TopNavComponent implements OnInit {

  route: string;

  constructor(location: Location, router: Router) {
    router.events.subscribe((val) => {
      if(location.path() != ''){
        this.route = location.path();
      } else {
        this.route = 'Home'
      }
    });
  }

  ngOnInit() {
  }

}

here is the reference link from where I have copied thing to get location for my project. https://github.com/elliotforbes/angular-2-admin/blob/master/src/app/common/top-nav/top-nav.component.ts

How to resolve compiler warning 'implicit declaration of function memset'

Old question but I had similar issue and I solved it by adding

extern void* memset(void*, int, size_t);

or just

extern void* memset();

at the top of translation unit ( *.c file ).

Website screenshots

you can use cutycapt .

kwhtml is deprecated and show page like old browser.

Android Studio SDK location

create a new folder in your android studio parent directory folder. Name it sdk or whatever you want. Select that folder from the drop down list when asked. Thats what solves it for me.

How to fix a collation conflict in a SQL Server query?

You can resolve the issue by forcing the collation used in a query to be a particular collation, e.g. SQL_Latin1_General_CP1_CI_AS or DATABASE_DEFAULT. For example:

SELECT MyColumn
FROM FirstTable a
INNER JOIN SecondTable b
ON a.MyID COLLATE SQL_Latin1_General_CP1_CI_AS = 
b.YourID COLLATE SQL_Latin1_General_CP1_CI_AS

In the above query, a.MyID and b.YourID would be columns with a text-based data type. Using COLLATE will force the query to ignore the default collation on the database and instead use the provided collation, in this case SQL_Latin1_General_CP1_CI_AS.

Basically what's going on here is that each database has its own collation which "provides sorting rules, case, and accent sensitivity properties for your data" (from http://technet.microsoft.com/en-us/library/ms143726.aspx) and applies to columns with textual data types, e.g. VARCHAR, CHAR, NVARCHAR, etc. When two databases have differing collations, you cannot compare text columns with an operator like equals (=) without addressing the conflict between the two disparate collations.

Where and why do I have to put the "template" and "typename" keywords?

I am placing JLBorges's excellent response to a similar question verbatim from cplusplus.com, as it is the most succinct explanation I've read on the subject.

In a template that we write, there are two kinds of names that could be used - dependant names and non- dependant names. A dependant name is a name that depends on a template parameter; a non-dependant name has the same meaning irrespective of what the template parameters are.

For example:
template< typename T > void foo( T& x, std::string str, int count )
{
    // these names are looked up during the second phase
    // when foo is instantiated and the type T is known
    x.size(); // dependant name (non-type)
    T::instance_count ; // dependant name (non-type)
    typename T::iterator i ; // dependant name (type)
      
    // during the first phase, 
    // T::instance_count is treated as a non-type (this is the default)
    // the typename keyword specifies that T::iterator is to be treated as a type.

    // these names are looked up during the first phase
    std::string::size_type s ; // non-dependant name (type)
    std::string::npos ; // non-dependant name (non-type)
    str.empty() ; // non-dependant name (non-type)
    count ; // non-dependant name (non-type)
}
What a dependant name refers to could be something different for each different instantiation of the template. As a consequence, C++ templates are subject to "two-phase name lookup". When a template is initially parsed (before any instantiation takes place) the compiler looks up the non-dependent names. When a particular instantiation of the template takes place, the template parameters are known by then, and the compiler looks up dependent names.

During the first phase, the parser needs to know if a dependant name is the name of a type or the name of a non-type. By default, a dependant name is assumed to be the name of a non-type. The typename keyword before a dependant name specifies that it is the name of a type.

Summary

Use the keyword typename only in template declarations and definitions provided you have a qualified name that refers to a type and depends on a template parameter.

Auto increment in MongoDB to store sequence of Unique User ID

The best way I found to make this to my purpose was to increment from the max value you have in the field and for that, I used the following syntax:

maxObj = db.CollectionName.aggregate([
  {
    $group : { _id: '$item', maxValue: { $max: '$fieldName' } } 
  }
];
fieldNextValue = maxObj.maxValue + 1;

$fieldName is the name of your field, but without the $ sign.

CollectionName is the name of your collection.

The reason I am not using count() is that the produced value could meet an existing value.

The creation of an enforcing unique index could make it safer:

db.CollectionName.createIndex( { "fieldName": 1 }, { unique: true } )

Hive: Filtering Data between Specified Dates when Date is a String

Just like SQL, Hive supports BETWEEN operator for more concise statement:

SELECT *
  FROM your_table
  WHERE your_date_column BETWEEN '2010-09-01' AND '2013-08-31';

Why are empty catch blocks a bad idea?

You should never have an empty catch block. It is like hiding a mistake you know about. At the very least you should write out an exception to a log file to review later if you are pressed for time.

How can I clear the SQL Server query cache?

While the question is just a bit old, this might still help. I'm running into similar issues and using the option below has helped me. Not sure if this is a permanent solution, but it's fixing it for now.

OPTION (OPTIMIZE FOR UNKNOWN)

Then your query will be like this

select * from Table where Col = 'someval' OPTION (OPTIMIZE FOR UNKNOWN)

NUnit Unit tests not showing in Test Explorer with Test Adapter installed

If your test project is set to target a 64bit platform, the tests won't show up in the NUnit Test Adapter.

Bootstrap modal - close modal when "call to action" button is clicked

Use data-dismiss="modal". In the version of Bootstrap I am using v3.3.5, when data-dismiss="modal" is added to the desired button like shown below it calls my external Javascript (JQuery) function beautifully and magically closes the modal. Its soo Sweet, I was worried I would have to call some modal hide in another function and chain that to the real working function

 <a href="#" id="btnReleaseAll" class="btn btn-primary btn-default btn-small margin-right pull-right" data-dismiss="modal">Yes</a>

In some external script file, and in my doc ready there is of course a function for the click of that identifier ID

 $("#divExamListHeader").on('click', '#btnReleaseAll', function () {
               // Do DatabaseMagic Here for a call a MVC ActionResult

XSS filtering function in PHP

There are a number of ways hackers put to use for XSS attacks, PHP's built-in functions do not respond to all sorts of XSS attacks. Hence, functions such as strip_tags, filter_var, mysql_real_escape_string, htmlentities, htmlspecialchars, etc do not protect us 100%. You need a better mechanism, here is what is solution:

function xss_clean($data)
{
// Fix &entity\n;
$data = str_replace(array('&amp;','&lt;','&gt;'), array('&amp;amp;','&amp;lt;','&amp;gt;'), $data);
$data = preg_replace('/(&#*\w+)[\x00-\x20]+;/u', '$1;', $data);
$data = preg_replace('/(&#x*[0-9A-F]+);*/iu', '$1;', $data);
$data = html_entity_decode($data, ENT_COMPAT, 'UTF-8');

// Remove any attribute starting with "on" or xmlns
$data = preg_replace('#(<[^>]+?[\x00-\x20"\'])(?:on|xmlns)[^>]*+>#iu', '$1>', $data);

// Remove javascript: and vbscript: protocols
$data = preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2nojavascript...', $data);
$data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2novbscript...', $data);
$data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u', '$1=$2nomozbinding...', $data);

// Only works in IE: <span style="width: expression(alert('Ping!'));"></span>
$data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?expression[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
$data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?behaviour[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
$data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^>]*+>#iu', '$1>', $data);

// Remove namespaced elements (we do not need them)
$data = preg_replace('#</*\w+:\w[^>]*+>#i', '', $data);

do
{
    // Remove really unwanted tags
    $old_data = $data;
    $data = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $data);
}
while ($old_data !== $data);

// we are done...
return $data;
}

How to handle invalid SSL certificates with Apache HttpClient?

EasySSLProtocolSocketFactory was giving me problems so I ended up implementing my own ProtocolSocketFactory.

First you need to register it:

Protocol.registerProtocol("https", new Protocol("https", new TrustAllSSLSocketFactory(), 443));

HttpClient client = new HttpClient();
...

Then implement ProtocolSocketFactory:

class TrustAllSSLSocketFactory implements ProtocolSocketFactory {

    public static final TrustManager[] TRUST_ALL_CERTS = new TrustManager[]{
        new X509TrustManager() {
            public void checkClientTrusted(final X509Certificate[] certs, final String authType) {

            }

            public void checkServerTrusted(final X509Certificate[] certs, final String authType) {

            }

            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }
    };

    private TrustManager[] getTrustManager() {
        return TRUST_ALL_CERTS;
    }

    public Socket createSocket(final String host, final int port, final InetAddress clientHost,
                               final int clientPort) throws IOException {
        return getSocketFactory().createSocket(host, port, clientHost, clientPort);
    }

    @Override
    public Socket createSocket(final String host, final int port, final InetAddress localAddress,
                               final int localPort, final HttpConnectionParams params) throws IOException {
        return createSocket(host, port);
    }

    public Socket createSocket(final String host, final int port) throws IOException {
        return getSocketFactory().createSocket(host, port);
    }

    private SocketFactory getSocketFactory() throws UnknownHostException {
        TrustManager[] trustAllCerts = getTrustManager();

        try {
            SSLContext context = SSLContext.getInstance("SSL");
            context.init(null, trustAllCerts, new SecureRandom());

            final SSLSocketFactory socketFactory = context.getSocketFactory();
            HttpsURLConnection.setDefaultSSLSocketFactory(socketFactory);
            return socketFactory;
        } catch (NoSuchAlgorithmException | KeyManagementException exception) {
            throw new UnknownHostException(exception.getMessage());
        }
    }
}

Note: This is with HttpClient 3.1 and Java 8

remove script tag from HTML content

Use the PHP DOMDocument parser.

$doc = new DOMDocument();

// load the HTML string we want to strip
$doc->loadHTML($html);

// get all the script tags
$script_tags = $doc->getElementsByTagName('script');

$length = $script_tags->length;

// for each tag, remove it from the DOM
for ($i = 0; $i < $length; $i++) {
  $script_tags->item($i)->parentNode->removeChild($script_tags->item($i));
}

// get the HTML string back
$no_script_html_string = $doc->saveHTML();

This worked me me using the following HTML document:

<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>
            hey
        </title>
        <script>
            alert("hello");
        </script>
    </head>
    <body>
        hey
    </body>
</html>

Just bear in mind that the DOMDocument parser requires PHP 5 or greater.

Write lines of text to a file in R

What's about a simple writeLines()?

txt <- "Hallo\nWorld"
writeLines(txt, "outfile.txt")

txt <- c("Hallo", "World")
writeLines(txt, "outfile.txt")

SQL - Update multiple records in one query

INSERT INTO tablename
    (name, salary)
    VALUES 
        ('Bob', 1125),
        ('Jane', 1200),
        ('Frank', 1100),
        ('Susan', 1175),
        ('John', 1150)
        ON DUPLICATE KEY UPDATE salary = VALUES(salary);

How to get the current time in Python

datetime.now() returns the current time as a naive datetime object that represents time in the local timezone. That value may be ambiguous e.g., during DST transitions ("fall back"). To avoid ambiguity either UTC timezone should be used:

from datetime import datetime

utc_time = datetime.utcnow()
print(utc_time) # -> 2014-12-22 22:48:59.916417

Or a timezone-aware object that has the corresponding timezone info attached (Python 3.2+):

from datetime import datetime, timezone

now = datetime.now(timezone.utc).astimezone()
print(now) # -> 2014-12-23 01:49:25.837541+03:00

How to POST form data with Spring RestTemplate?

Your url String needs variable markers for the map you pass to work, like:

String url = "https://app.example.com/hr/email?{email}";

Or you could explicitly code the query params into the String to begin with and not have to pass the map at all, like:

String url = "https://app.example.com/hr/[email protected]";

How to get the PID of a process by giving the process name in Mac OS X ?

This solution matches the process name more strictly:

ps -Ac -o pid,comm | awk '/^ *[0-9]+ Dropbox$/ {print $1}'

This solution has the following advantages:

it ignores command line arguments like tail -f ~/Dropbox
it ignores processes inside a directory like ~/Dropbox/foo.sh
it ignores processes with names like ~/DropboxUID.sh

Difference between Xms and Xmx and XX:MaxPermSize

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

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

-Xmssize Specifies the initial heap size.

-Xmxsize Specifies the maximum heap size.

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

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

References:

How is the java memory pool divided?

What is perm space?

Java (JVM) Memory Model – Memory Management in Java

Java 7 SE Command Line Options

Java 7 HotSpot VM Options

Oracle Date - How to add years to date

Change value of input onchange?

You can't access your fieldname as a global variable. Use document.getElementById:

function updateInput(ish){
    document.getElementById("fieldname").value = ish;
}

and

onchange="updateInput(this.value)"

javascript change background color on click

You can sets the body's background colour using document.body.style.backgroundColor = "red"; so this can be put into a function that's called when the user clicks. The next part can be done by using document.getElementByID("divID").style.backgroundColor = "red"; window.setTimeout("yourFunction()",10000); which calls yourFunction in 10 seconds to change the colour back.

What is the iPad user agent?

(almost 10 years later...)

From iOS 13 the iPad's user agent has changed to Mac OS, for example:

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15

Delete a single record from Entity Framework?

Employer employer = context.Employers.First(x => x.EmployerId == 1);

context.Customers.DeleteObject(employer);
context.SaveChanges();

Convert IEnumerable to DataTable

Firstly you need to add a where T:class constraint - you can't call GetValue on value types unless they're passed by ref.

Secondly GetValue is very slow and gets called a lot.

To get round this we can create a delegate and call that instead:

MethodInfo method = property.GetGetMethod(true);
Delegate.CreateDelegate(typeof(Func<TClass, TProperty>), method );

The problem is that we don't know TProperty, but as usual on here Jon Skeet has the answer - we can use reflection to retrieve the getter delegate, but once we have it we don't need to reflect again:

public class ReflectionUtility
{
    internal static Func<object, object> GetGetter(PropertyInfo property)
    {
        // get the get method for the property
        MethodInfo method = property.GetGetMethod(true);

        // get the generic get-method generator (ReflectionUtility.GetSetterHelper<TTarget, TValue>)
        MethodInfo genericHelper = typeof(ReflectionUtility).GetMethod(
            "GetGetterHelper",
            BindingFlags.Static | BindingFlags.NonPublic);

        // reflection call to the generic get-method generator to generate the type arguments
        MethodInfo constructedHelper = genericHelper.MakeGenericMethod(
            method.DeclaringType,
            method.ReturnType);

        // now call it. The null argument is because it's a static method.
        object ret = constructedHelper.Invoke(null, new object[] { method });

        // cast the result to the action delegate and return it
        return (Func<object, object>) ret;
    }

    static Func<object, object> GetGetterHelper<TTarget, TResult>(MethodInfo method)
        where TTarget : class // target must be a class as property sets on structs need a ref param
    {
        // Convert the slow MethodInfo into a fast, strongly typed, open delegate
        Func<TTarget, TResult> func = (Func<TTarget, TResult>) Delegate.CreateDelegate(typeof(Func<TTarget, TResult>), method);

        // Now create a more weakly typed delegate which will call the strongly typed one
        Func<object, object> ret = (object target) => (TResult) func((TTarget) target);
        return ret;
    }
}

So now your method becomes:

public static DataTable ToDataTable<T>(this IEnumerable<T> items) 
    where T: class
{  
    // ... create table the same way

    var propGetters = new List<Func<T, object>>();
foreach (var prop in props)
    {
        Func<T, object> func = (Func<T, object>) ReflectionUtility.GetGetter(prop);
        propGetters.Add(func);
    }

    // Add the property values per T as rows to the datatable
    foreach (var item in items) 
    {  
        var values = new object[props.Length];  
        for (var i = 0; i < props.Length; i++) 
        {
            //values[i] = props[i].GetValue(item, null);   
            values[i] = propGetters[i](item);
        }    

        table.Rows.Add(values);  
    } 

    return table; 
}

You could further optimise it by storing the getters for each type in a static dictionary, then you will only have the reflection overhead once for each type.

nginx error:"location" directive is not allowed here in /etc/nginx/nginx.conf:76

The server directive has to be in the http directive. It should not be outside of it.

Incase if you need detailed information, refer this.

Is JavaScript guaranteed to be single-threaded?

Yes, although Internet Explorer 9 will compile your Javascript on a separate thread in preparation for execution on the main thread. This doesn't change anything for you as a programmer, though.

How to convert all text to lowercase in Vim

Usually Vu (or VU for uppercase) is enough to turn the whole line into lowercase as V already selects the whole line to apply the action against.

Tilda (~) changes the case of the individual letter, resulting in camel case or the similar.

It is really great how Vim has many many different modes to deal with various occasions and how those modes are neatly organized.

For instance, v - the true visual mode, and the related V - visual line, and Ctrl+Q - visual block modes (what allows you to select blocks, a great feature some other advanced editors also offer usually by holding the Alt key and selecting the text).

Raw SQL Query without DbSet - Entity Framework Core

You can also use QueryFirst. Like Dapper, this is totally outside EF. Unlike Dapper (or EF), you don't need to maintain the POCO, you edit your sql SQL in a real environment, and it's continually revalidated against the DB. Disclaimer: I'm the author of QueryFirst.

jquery - is not a function error

The problem arises when a different system grabs the $ variable. You have multiple $ variables being used as objects from multiple libraries, resulting in the error.

To solve it, use jQuery.noConflict just before your (function($){:

jQuery.noConflict();
(function($){
$.fn.pluginbutton = function (options) {
...

Why AVD Manager options are not showing in Android Studio

Usually this implies some Android setup issue with the project. Go to the "Resource Manager" tab where you will be able to click on "Add Android Module" and click on import gradle files. If the import fails, you will get error messages that you can work with

How do I add a Maven dependency in Eclipse?

On the top menu bar, open Window -> Show View -> Other
In the Show View window, open Maven -> Maven Repositories

In the window that appears, right-click on Global Repositories and select Go Into
Right-click on "central (http://repo.maven.apache.org/maven2)" and select "Rebuild Index"

Note that it will take very long to complete the download!!!

Once indexing is complete, Right-click on the project -> Maven -> Add Dependency and start typing the name of the project you want to import (such as "hibernate").

The search results will auto-fill in the "Search Results" box below.

How can I clear or empty a StringBuilder?

There are basically two alternatives, using setLength(0) to reset the StringBuilder or creating a new one in each iteration. Both can have pros and cons depending on the usage.

If you know the expected capacity of the StringBuilder beforehand, creating a new one each time should be just as fast as setting a new length. It will also help the garbage collector, since each StringBuilder will be relatively short-lived and the gc is optimized for that.

When you don't know the capacity, reusing the same StringBuilder might be faster. Each time you exceed the capacity when appending, a new backing array has to be allocated and the previous content has to be copied. By reusing the same StringBuilder, it will reach the needed capacity after some iterations and there won't be any copying thereafter.

SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. Cannot create an automatic instance

Breaking Changes to LocalDB: Applies to SQL 2014; take a look over this article and try to use (localdb)\mssqllocaldb as server name to connect to the LocalDB automatic instance, for example:

<connectionStrings>
  <add name="ProductsContext" connectionString="Data Source=(localdb)\mssqllocaldb; 
  ...

The article also mentions the use of 2012 SSMS to connect to the 2014 LocalDB. Which leads me to believe that you might have multiple versions of SQL installed - which leads me to point out this SO answer that suggests changing the default name of your LocalDB "instance" to avoid other version mismatch issues that might arise going forward; mentioned not as source of issue, but to raise awareness of potential clashes that multiple SQL version installed on a single dev machine might lead to ... and something to get in the habit of in order to avoid some.

Another thing worth mentioning - if you've gotten your instance in an unusable state due to tinkering with it to try and fix this problem, then it might be worth starting over - uninstall, reinstall - then try using the mssqllocaldb value instead of v12.0 and see if that corrects your issue.

Convert string to date in Swift

make global function

func convertDateFormat(inputDate: String) -> String {

     let olDateFormatter = DateFormatter()
     olDateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"

     let oldDate = olDateFormatter.date(from: inputDate)

     let convertDateFormatter = DateFormatter()
     convertDateFormatter.dateFormat = "MMM dd yyyy h:mm a"

     return convertDateFormatter.string(from: oldDate!)
}

Called function and pass value in it

get_OutputStr = convertDateFormat(inputDate: "2019-03-30T05:30:00+0000")

and here is output

Feb 25 2020 4:51 PM

Why is SQL server throwing this error: Cannot insert the value NULL into column 'id'?

In my case,

I was trying to update my model by making a foreign key required, but the database had "null" data in it already in some columns from previously entered data. So every time i run update-database...i got the error.

I SOLVED it by manually deleting from the database all rows that had null in the column i was making required.

How can I make an "are you sure" prompt in a Windows batchfile?

You can consider using a UI confirmation.

With yesnopopup.bat

@echo off

for /f "tokens=* delims=" %%# in ('yesnopopup.bat') do (
    set "result=%%#"
)

if /i result==no (
    echo user rejected the script
    exit /b 1
) 

echo continue

rem --- other commands --

the user will see the following and depending on the choice the script will continue:

with absolutely the same script you can use also iexpYNbutton.bat which will produce similar popup.

With buttons.bat you can try the following script:

@echo off

for /f "tokens=* delims=" %%# in ('buttons.bat "Yep!" "Nope!" ') do (
    set "result=%%#"
)

if /i result==2 (
    echo user rejected the script
    exit /b 1
) 

echo continue

rem --- other commands --

and the user will see:

Is there a JavaScript strcmp()?

Javascript doesn't have it, as you point out.

A quick search came up with:

function strcmp ( str1, str2 ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Waldo Malqui Silva
    // +      input by: Steve Hilder
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    revised by: gorthaur
    // *     example 1: strcmp( 'waldo', 'owald' );
    // *     returns 1: 1
    // *     example 2: strcmp( 'owald', 'waldo' );
    // *     returns 2: -1

    return ( ( str1 == str2 ) ? 0 : ( ( str1 > str2 ) ? 1 : -1 ) );
}

from http://kevin.vanzonneveld.net/techblog/article/javascript_equivalent_for_phps_strcmp/

Of course, you could just add localeCompare if needed:

if (typeof(String.prototype.localeCompare) === 'undefined') {
    String.prototype.localeCompare = function(str, locale, options) {
        return ((this == str) ? 0 : ((this > str) ? 1 : -1));
    };
}

And use str1.localeCompare(str2) everywhere, without having to worry wether the local browser has shipped with it. The only problem is that you would have to add support for locales and options if you care about that.

Concat a string to SELECT * MySql

You simply can't do that in SQL. You have to explicitly list the fields and concat each one:

SELECT CONCAT(field1, '/'), CONCAT(field2, '/'), ... FROM `socials` WHERE 1

If you are using an app, you can use SQL to read the column names, and then use your app to construct a query like above. See this stackoverflow question to find the column names: Get table column names in mysql?

php how to go one level up on dirname(FILE)

Try this

dirname(dirname( __ FILE__))

Edit: removed "./" because it isn't correct syntax. Without it, it works perfectly.

Codeigniter $this->db->order_by(' ','desc') result is not complete

Put from before where, and order_by on last:

$this->db->select('*');
$this->db->from('courses');
$this->db->where('tennant_id',$tennant_id);
$this->db->order_by("UPPER(course_name)","desc");

Or try BINARY:

ORDER BY BINARY course_name DESC;

You should add manually on codeigniter for binary sorting.

And set "course_name" character column.

If sorting is used on a character type column, normally the sort is conducted in a case-insensitive fashion.

What type of structure data in courses table?

If you frustrated you can put into array and return using PHP:

Use natcasesort for order in "natural order": (Reference: http://php.net/manual/en/function.natcasesort.php)

Your array from database as example: $array_db = $result_from_db:

$final_result = natcasesort($array_db);

print_r($final_result);

Remove Project from Android Studio

If you are trying to delete/cut as suggested by @Pacific P. Regmi and if you are getting "Folder in use" which won't let you to delete/cut make sure to close all the android studio instances.

Ruby String to Date Conversion

What is wrong with Date.parse method?

str = "Tue, 10 Aug 2010 01:20:19 -0400 (EDT)"
date = Date.parse str
=> #<Date: 4910837/2,0,2299161>
puts date
2010-08-10

It seems to work.

The only problem here is time zone. If you want date in UTC time zone, then it is better to use Time object, suppose we have string:

str = "Tue, 10 Aug 2010 01:20:19 +0400"
puts Date.parse str
2010-08-10
puts Date.parse(Time.parse(str).utc.to_s)
2010-08-09

I couldn't find simpler method to convert Time to Date.

Display / print all rows of a tibble (tbl_df)

i prefer to physically print my tables instead:

CONNECT_SERVER="https://196.168.1.1/"
CONNECT_API_KEY<-"hpphotosmartP9000:8273827"

data.frame = data.frame(1:1000, 1000:2)

connectServer <- Sys.getenv("CONNECT_SERVER")
apiKey <- Sys.getenv("CONNECT_API_KEY")

install.packages('print2print')

print2print::send2printer(connectServer, apiKey, data.frame)

How do I launch the Android emulator from the command line?

For one-click (BATCH file) launch, this is what I've done:

got the name of AVD from Android Studio -> Tools -> AVD Manager -> Click on Arrow Down and choose View Details ( for me it's Pixel_2_API_28, so change accordingly below)
create an start.bat file and put the following inside:

 c: 
 cd C:\Program Files (x86)\Android\android-sdk\emulator\ 
 emulator -avd Pixel_2_API_28

Explanations:

First line: for me was necessary because I am launching it from d:
Second line: for me was not working the tools\emulator
Third line: make sure you change the name of the AVD with yours (here Pixel_2_API_28)

Using:

launch start.bat from command line

How do I get Fiddler to stop ignoring traffic to localhost?

Windows XP:

Be sure to set to click the settings button for each of the items in the "Dial-up and Virtual Private Network settings" listbox in the "Connections" tab of the "Internet Options" control panel applet.

I noticed that Fiddler would stop using the "LAN settings" configuration once I connected to my VPN. Even if the traffic wasn't going through the VPN.

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at

session_start() must be at the top of your source, no html or other output befor!
your can only send session_start() one time
by this way if(session_status()!=PHP_SESSION_ACTIVE) session_start()

How to place object files in separate subdirectory

For anyone that is working with a directory style like this:

project
    > src
        > pkgA     
        > pkgB
        ...
    > bin
        > pkgA
        > pkgB
        ...

The following worked very well for me. I made this myself, using the GNU make manual as my main reference; this, in particular, was extremely helpful for my last rule, which ended up being the most important one for me.

My Makefile:

PROG := sim
CC := g++
ODIR := bin
SDIR := src
MAIN_OBJ := main.o
MAIN := main.cpp
PKG_DIRS := $(shell ls $(SDIR))
CXXFLAGS = -std=c++11 -Wall $(addprefix -I$(SDIR)/,$(PKG_DIRS)) -I$(BOOST_ROOT)
FIND_SRC_FILES = $(wildcard $(SDIR)/$(pkg)/*.cpp) 
SRC_FILES = $(foreach pkg,$(PKG_DIRS),$(FIND_SRC_FILES)) 
OBJ_FILES = $(patsubst $(SDIR)/%,$(ODIR)/%,\
$(patsubst %.cpp,%.o,$(filter-out $(SDIR)/main/$(MAIN),$(SRC_FILES))))

vpath %.h $(addprefix $(SDIR)/,$(PKG_DIRS))
vpath %.cpp $(addprefix $(SDIR)/,$(PKG_DIRS)) 
vpath $(MAIN) $(addprefix $(SDIR)/,main)

# main target
#$(PROG) : all
$(PROG) : $(MAIN) $(OBJ_FILES) 
    $(CC) $(CXXFLAGS) -o $(PROG) $(SDIR)/main/$(MAIN) 

# debugging
all : ; $(info $$PKG_DIRS is [${PKG_DIRS}])@echo Hello world

%.o : %.cpp
    $(CC) $(CXXFLAGS) -c $< -o $@

# This one right here, folks. This is the one.
$(OBJ_FILES) : $(ODIR)/%.o : $(SDIR)/%.h
    $(CC) $(CXXFLAGS) -c $< -o $@

# for whatever reason, clean is not being called...
# any ideas why???
.PHONY: clean

clean :
    @echo Build done! Cleaning object files...
    @rm -r $(ODIR)/*/*.o

By using $(SDIR)/%.h as a prerequisite for $(ODIR)/%.o, this forced make to look in source-package directories for source code instead of looking in the same folder as the object file.

I hope this helps some people. Let me know if you see anything wrong with what I've provided.

BTW: As you may see from my last comment, clean is not being called and I am not sure why. Any ideas?

How to stop mysqld

I did it with next command:

sudo killall mysqld

How to call a method defined in an AngularJS directive?

Assuming that the action button uses the same controller $scope as the directive, just define function updateMap on $scope inside the link function. Your controller can then call that function when the action button is clicked.

<div ng-controller="MyCtrl">
    <map></map>
    <button ng-click="updateMap()">call updateMap()</button>
</div>

app.directive('map', function() {
    return {
        restrict: 'E',
        replace: true,
        template: '<div></div>',
        link: function($scope, element, attrs) {
            $scope.updateMap = function() {
                alert('inside updateMap()');
            }
        }
    }
});

fiddle

As per @FlorianF's comment, if the directive uses an isolated scope, things are more complicated. Here's one way to make it work: add a set-fn attribute to the map directive which will register the directive function with the controller:

<map set-fn="setDirectiveFn(theDirFn)"></map>
<button ng-click="directiveFn()">call directive function</button>

scope: { setFn: '&' },
link: function(scope, element, attrs) {
    scope.updateMap = function() {
       alert('inside updateMap()');
    }
    scope.setFn({theDirFn: scope.updateMap});
}

function MyCtrl($scope) {
    $scope.setDirectiveFn = function(directiveFn) {
        $scope.directiveFn = directiveFn;
    };
}

fiddle

Java Process with Input/Output Stream

You have writer.close(); in your code. So bash receives EOF on its stdin and exits. Then you get Broken pipe when trying to read from the stdoutof the defunct bash.

Python: BeautifulSoup - get an attribute value based on the name attribute

6 years late to the party but I've been searching for how to extract an html element's tag attribute value, so for:

<span property="addressLocality">Ayr</span>

I want "addressLocality". I kept being directed back here, but the answers didn't really solve my problem.

How I managed to do it eventually:

>>> from bs4 import BeautifulSoup as bs

>>> soup = bs('<span property="addressLocality">Ayr</span>', 'html.parser')
>>> my_attributes = soup.find().attrs
>>> my_attributes
{u'property': u'addressLocality'}

As it's a dict, you can then also use keys and 'values'

>>> my_attributes.keys()
[u'property']
>>> my_attributes.values()
[u'addressLocality']

Hopefully it helps someone else!

CSS selector - element with a given child

I agree that it is not possible in general.

The only thing CSS3 can do (which helped in my case) is to select elements that have no children:

table td:empty
{
   background-color: white;
}

Or have any children (including text):

table td:not(:empty)
{
   background-color: white;
}

Check if String contains only letters

Or if you are using Apache Commons, [StringUtils.isAlpha()].

UITextField text change event

Swift 4 Version

Using Key-Value Observing Notify objects about changes to the properties of other objects.

var textFieldObserver: NSKeyValueObservation?

textFieldObserver = yourTextField.observe(\.text, options: [.new, .old]) { [weak self] (object, changeValue) in
  guard let strongSelf = self else { return }
  print(changeValue)
}

Static extension methods

In short, no, you can't.

Long answer, extension methods are just syntactic sugar. IE:

If you have an extension method on string let's say:

public static string SomeStringExtension(this string s)
{
   //whatever..
}

When you then call it:

myString.SomeStringExtension();

The compiler just turns it into:

ExtensionClass.SomeStringExtension(myString);

So as you can see, there's no way to do that for static methods.

And another thing just dawned on me: what would really be the point of being able to add static methods on existing classes? You can just have your own helper class that does the same thing, so what's really the benefit in being able to do:

Bool.Parse(..)

vs.

Helper.ParseBool(..);

Doesn't really bring much to the table...

How do you simulate Mouse Click in C#?

Some controls, like Button in System.Windows.Forms, have a "PerformClick" method to do just that.

What's the difference between using CGFloat and float?

As others have said, CGFloat is a float on 32-bit systems and a double on 64-bit systems. However, the decision to do that was inherited from OS X, where it was made based on the performance characteristics of early PowerPC CPUs. In other words, you should not think that float is for 32-bit CPUs and double is for 64-bit CPUs. (I believe, Apple's ARM processors were able to process doubles long before they went 64-bit.) The main performance hit of using doubles is that they use twice the memory and therefore might be slower if you are doing a lot of floating point operations.

Catch multiple exceptions at once?

This is a classic problem every C# developer faces eventually.

Let me break your question into 2 questions. The first,

Can I catch multiple exceptions at once?

In short, no.

Which leads to the next question,

How do I avoid writing duplicate code given that I can't catch multiple exception types in the same catch() block?

Given your specific sample, where the fall-back value is cheap to construct, I like to follow these steps:

Initialize WebId to the fall-back value.
Construct a new Guid in a temporary variable.
Set WebId to the fully constructed temporary variable. Make this the final statement of the try{} block.

So the code looks like:

try
{
    WebId = Guid.Empty;
    Guid newGuid = new Guid(queryString["web"]);
    // More initialization code goes here like 
    // newGuid.x = y;
    WebId = newGuid;
}
catch (FormatException) {}
catch (OverflowException) {}

If any exception is thrown, then WebId is never set to the half-constructed value, and remains Guid.Empty.

If constructing the fall-back value is expensive, and resetting a value is much cheaper, then I would move the reset code into its own function:

try
{
    WebId = new Guid(queryString["web"]);
    // More initialization code goes here.
}
catch (FormatException) {
    Reset(WebId);
}
catch (OverflowException) {
    Reset(WebId);
}

How do you detect/avoid Memory leaks in your (Unmanaged) code?

I've been using DevStudio for far too many years now and it always amazes me just how many programmers don't know about the memory analysis tools that are available in the debug run time libraries. Here's a few links to get started with:

Tracking Heap Allocation Requests - specifically the section on Unique Allocation Request Numbers

_CrtSetDbgFlag

_CrtSetBreakAlloc

Of course, if you're not using DevStudio then this won't be particularly helpful.

The transaction manager has disabled its support for remote/network transactions

I was having this issue with a linked server in SSMS while trying to create a stored procedure.

On the linked server, I changed the server option "Enable Promotion on Distributed Transaction" to False.

Screenshot of Server Options

Convert int to string?

string s = "" + 2;

and you can do nice things like:

string s = 2 + 2 + "you"

The result will be:

"4 you"

How does a Java HashMap handle different objects with the same hash code?

Each Entry object represents key-value pair. Field next refers to other Entry object if a bucket has more than 1 Entry.

Sometimes it might happen that hashCodes for 2 different objects are the same. In this case 2 objects will be saved in one bucket and will be presented as LinkedList. The entry point is more recently added object. This object refers to other object with next field and so one. Last entry refers to null. When you create HashMap with default constructor

Array is gets created with size 16 and default 0.75 load balance.

enter image description here

(Source)

How do I rotate a picture in WinForms

This solution assumes that you want to draw the image in a picture box and that the image orientation will follow the mouse movements over this picture box. No image is assigned to the picture box. Instead I'm getting the image from a project resource.

private float _angle;

public Form1()
{
    InitializeComponent();
}

private void PictureBox_MouseMove(object sender, MouseEventArgs e)
{
    (float centerX, float centerY) = GetCenter(pictureBox1.ClientRectangle);
    _angle = (float)(Math.Atan2(e.Y - centerY, e.X - centerX) * 180.0 / Math.PI);
    pictureBox1.Invalidate(); // Triggers redrawing
}

private void PictureBox_Paint(object sender, PaintEventArgs e)
{
    Bitmap image = Properties.Resources.ExampleImage;
    float scale = (float)pictureBox1.Width / image.Width;

    (float centerX, float centerY) = GetCenter(e.ClipRectangle);

    e.Graphics.TranslateTransform(centerX, centerY);
    e.Graphics.RotateTransform(_angle);
    e.Graphics.TranslateTransform(-centerX, -centerY);
    e.Graphics.ScaleTransform(scale, scale);
    e.Graphics.DrawImage(image, 0, 0);
}

// Uses C# 7.0 value tuples / .NET Framework 4.7.
// For previous versions, return a PointF instead.
private static (float, float) GetCenter(Rectangle rect)
{
    float centerX = (rect.Left + rect.Right) * 0.5f;
    float centerY = (rect.Top + rect.Bottom) * 0.5f;
    return (centerX, centerY);
}

Make sure to to select the mouse event handlers PictureBox_MouseMove and PictureBox_Paint in properties window of the picture box for these events, after you copy/pasted this code into the form.

Note: You could also use a simple Panel or any other control, like a label; however, the PictureBox has the advantage to use double buffering by default, which eliminates flickering.

How do I parse JSON into an int?

I use a combination of json.get() and instanceof to read in values that might be either integers or integer strings.

These three test cases illustrate:

int val;
Object obj;
JSONObject json = new JSONObject();
json.put("number", 1);
json.put("string", "10");
json.put("other", "tree");

obj = json.get("number");
val = (obj instanceof Integer) ? (int) obj : (int) Integer.parseInt((String) obj);
System.out.println(val);

obj = json.get("string");
val = (obj instanceof Integer) ? (int) obj : (int) Integer.parseInt((String) obj);
System.out.println(val);

try {
    obj = json.get("other");
    val = (obj instanceof Integer) ? (int) obj : (int) Integer.parseInt((String) obj);
} catch (Exception e) {
    // throws exception
}

Omitting the second expression when using the if-else shorthand

What you have is a fairly unusual use of the ternary operator. Usually it is used as an expression, not a statement, inside of some other operation, e.g.:

var y = (x == 2 ? "yes" : "no");

So, for readability (because what you are doing is unusual), and because it avoids the "else" that you don't want, I would suggest:

if (x==2) doSomething();

PHP: cannot declare class because the name is already in use

Another option to include_once or require_once is to use class autoloading. http://php.net/manual/en/language.oop5.autoload.php

Async image loading from url inside a UITableView cell - image changes to wrong image while scrolling

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
        MyCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];

        cell.poster.image = nil; // or cell.poster.image = [UIImage imageNamed:@"placeholder.png"];

        NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://myurl.com/%@.jpg", self.myJson[indexPath.row][@"movieId"]]];

        NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            if (data) {
                UIImage *image = [UIImage imageWithData:data];
                if (image) {
                    dispatch_async(dispatch_get_main_queue(), ^{
                        MyCell *updateCell = (id)[tableView cellForRowAtIndexPath:indexPath];
                        if (updateCell)
                            updateCell.poster.image = image;
                    });
                }
            }
        }];
        [task resume];

        return cell;
    }

INNER JOIN same table

I think the problem is in your JOIN condition.

SELECT user.user_fname,
       user.user_lname,
       parent.user_fname,
       parent.user_lname
FROM users AS user
JOIN users AS parent 
  ON parent.user_id = user.user_parent_id
WHERE user.user_id = $_GET[id]

Edit: You should probably use LEFT JOIN if there are users with no parents.

Update a submodule to the latest commit

Single line version

git submodule foreach "(git checkout master; git pull; cd ..; git add '$path'; git commit -m 'Submodule Sync')"

fatal: Not a git repository (or any of the parent directories): .git

The command has to be entered in the directory of the repository. The error is complaining that your current directory isn't a git repo

Are you in the right directory? Does typing ls show the right files?
Have you initialized the repository yet? Typed git init? (git-init documentation)

Either of those would cause your error.

How do I access the $scope variable in browser's console using AngularJS?

I agree the best is Batarang with it's $scope after selecting an object (it's the same as angular.element($0).scope() or even shorter with jQuery: $($0).scope() (my favorite))

Also, if like me you have you main scope on the body element, a $('body').scope() works fine.

Resource files not found from JUnit test cases

You know that Maven is based on the Convention over Configuration pardigm? so you shouldn't configure things which are the defaults.

All that stuff represents the default in Maven. So best practice is don't define it it's already done.

    <directory>target</directory>
    <outputDirectory>target/classes</outputDirectory>
    <testOutputDirectory>target/test-classes</testOutputDirectory>
    <sourceDirectory>src/main/java</sourceDirectory>
    <testSourceDirectory>src/test/java</testSourceDirectory>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
        </resource>
    </resources>
    <testResources>
        <testResource>
            <directory>src/test/resources</directory>
        </testResource>
    </testResources>

How to convert date to string and to date again?

try this:

 String DATE_FORMAT_NOW = "yyyy-MM-dd";
 Date date = new Date();
 SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
 String stringDate = sdf.format(date );
    try {
        Date date2 = sdf.parse(stringDate);
    } catch(ParseException e){
     //Exception handling
    } catch(Exception e){
     //handle exception
    }

Bundler::GemNotFound: Could not find rake-10.3.2 in any of the sources

I think rake must be preinstalled if you want work with bundler. Try to install rake via 'gem install' and then run 'bundle install' again:

gem install rake && bundle install

If you are using rvm ( http://rvm.io ) rake is installed by default...

Build Maven Project Without Running Unit Tests

Run following command:

mvn clean install -DskipTests=true

Javascript: How to generate formatted easy-to-read JSON straight from an object?

JSON.stringify takes more optional arguments.

Try:

 JSON.stringify({a:1,b:2,c:{d:1,e:[1,2]}}, null, 4); // Indented 4 spaces
 JSON.stringify({a:1,b:2,c:{d:1,e:[1,2]}}, null, "\t"); // Indented with tab

From:

How can I beautify JSON programmatically?

Should work in modern browsers, and it is included in json2.js if you need a fallback for browsers that don't support the JSON helper functions. For display purposes, put the output in a <pre> tag to get newlines to show.

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified

your dependency based on data is trying to find their respective entities which one has not been created, comments the dependencies based on data and runs the app again.

<!-- <dependency> -->
        <!-- <groupId>org.springframework.boot</groupId> -->
        <!-- <artifactId>spring-boot-starter-data-jpa</artifactId> -->
        <!-- </dependency> -->

how to get current datetime in SQL?

SYSDATETIME() 2007-04-30 13:10:02.0474381
SYSDATETIMEOFFSET()2007-04-30 13:10:02.0474381 -07:00
SYSUTCDATETIME() 2007-04-30 20:10:02.0474381
CURRENT_TIMESTAMP 2007-04-30 13:10:02.047 +
GETDATE() 2007-04-30 13:10:02.047 
GETUTCDATE() 2007-04-30 20:10:02.047

I guess NOW() doesn't work sometime and gives error 'NOW' is not a recognized built-in function name.

Hope it helps!!! Thank You. https://docs.microsoft.com/en-us/sql/t-sql/functions/getdate-transact-sql

How to convert a byte array to its numeric value (Java)?

If this is an 8-bytes numeric value, you can try:

BigInteger n = new BigInteger(byteArray);

If this is an UTF-8 character buffer, then you can try:

BigInteger n = new BigInteger(new String(byteArray, "UTF-8"));

How do I read any request header in PHP

PHP 7: Null Coalesce Operator

//$http = 'SCRIPT_NAME';
$http = 'X_REQUESTED_WITH';
$http = strtoupper($http);
$header = $_SERVER['HTTP_'.$http] ?? $_SERVER[$http] ?? NULL;

if(is_null($header)){
    die($http. ' Not Found');
}
echo $header;

How to replace local branch with remote branch entirely in Git?

The ugly but simpler way: delete your local folder, and clone the remote repository again.

How to compare two java objects

You need to implement the equals() method in your MyClass.

The reason that == didn't work is this is checking that they refer to the same instance. Since you did new for each, each one is a different instance.

The reason that equals() didn't work is because you didn't implement it yourself yet. I believe it's default behavior is the same thing as ==.

Note that you should also implement hashcode() if you're going to implement equals() because a lot of java.util Collections expect that.

Deep copy of a dict in python

A simpler (in my view) solution is to create a new dictionary and update it with the contents of the old one:

my_dict={'a':1}

my_copy = {}

my_copy.update( my_dict )

my_dict['a']=2

my_dict['a']
Out[34]: 2

my_copy['a']
Out[35]: 1

The problem with this approach is it may not be 'deep enough'. i.e. is not recursively deep. good enough for simple objects but not for nested dictionaries. Here is an example where it may not be deep enough:

my_dict1={'b':2}

my_dict2={'c':3}

my_dict3={ 'b': my_dict1, 'c':my_dict2 }

my_copy = {}

my_copy.update( my_dict3 )

my_dict1['b']='z'

my_copy
Out[42]: {'b': {'b': 'z'}, 'c': {'c': 3}}

By using Deepcopy() I can eliminate the semi-shallow behavior, but I think one must decide which approach is right for your application. In most cases you may not care, but should be aware of the possible pitfalls... final example:

import copy

my_copy2 = copy.deepcopy( my_dict3 )

my_dict1['b']='99'

my_copy2
Out[46]: {'b': {'b': 'z'}, 'c': {'c': 3}}

How do I import a namespace in Razor View Page?

"using MyNamespace" works in MVC3 RTM. Hope this helps.

keytool error bash: keytool: command not found

If the jre is installed on your machine properly then look for keytool in jre or in jre/bin

to find where jre is installed, use this

sudo find / -name jre
Then look for keytool in path_to_jre or in path_to_jre/bin
cd to keytool location
then run ./keytool
Make sure to add the the path to $PATH by

export PATH=$PATH:location_to_keytool
To make sure you got it right after this, run

where keytool
for future edit you bash or zshrc file and source it

Change One Cell's Data in mysql

try this.

UPDATE `database_name`.`table_name` SET `column_name`='value' WHERE `id`='1';

Finding element in XDocument?

The Elements() method returns an IEnumerable<XElement> containing all child elements of the current node. For an XDocument, that collection only contains the Root element. Therefore the following is required:

var query = from c in xmlFile.Root.Elements("Band")
            select c;

How to define multiple CSS attributes in jQuery?

Try this

$(element).css({
    "propertyName1":"propertyValue1",
    "propertyName2":"propertyValue2"
})

Finding which process was killed by Linux OOM killer

Try this so you don't need to worry about where your logs are:

dmesg -T | egrep -i 'killed process'

-T - readable timestamps

Zoom to fit all markers in Mapbox or Leaflet

You have an array of L.Marker:

let markers = [marker1, marker2, marker3]

let latlngs = markers.map(marker => marker.getLatLng())

let latlngBounds = L.latLngBounds(latlngs)

map.fitBounds(latlngBounds)
// OR with a smooth animation
// map.flyToBounds(latlngBounds)

How to force a checkbox and text on the same line?

http://jsbin.com/etozop/2/edit

put a div wrapper with WIDTH :

  <p><fieldset style="width:60px;">
   <div style="border:solid 1px red;width:80px;">
    <input type="checkbox" id="a">
    <label for="a">a</label>
    <input type="checkbox" id="b">

    <label for="b">b</label>
   </div>

    <input type="checkbox" id="c">
    <label for="c">c</label>
</fieldset></p>

a name could be " john winston ono lennon" which is very long... so what do you want to do? (youll never know the length)... you could make a function that wraps after x chars like : "john winston o...."

str_replace with array

If the text is a simple markup and has existing anchors, stage the existing anchor tags first, swap out the urls, then replace the staged markers.

$text = '
Lorem Ipsum is simply dummy text found by searching http://google.com/?q=lorem in your <a href=https://www.mozilla.org/en-US/firefox/>Firefox</a>,
<a href="https://www.apple.com/safari/">Safari</a>, or https://www.google.com/chrome/ browser.

Link replacements will first stage existing anchor tags, replace each with a marker, then swap out the remaining links.
Links should be properly encoded.  If links are not separated from surrounding content like a trailing "." period then they it will be included in the link.
Links that are not encoded properly may create a problem, so best to use this when you know the text you are processing is not mixed HTML.

Example: http://google.com/i,m,complicate--d/index.html
Example: https://www.google.com/chrome/?123&t=123
Example: http://google.com/?q='. urlencode('<a href="http://google.com">http://google.com</a>') .'
';

// Replace existing links with a marker
$linkStore = array();
$text = preg_replace_callback('/(<a.*?a>)/', function($match) use (&$linkStore){ $key = '__linkStore'.count($linkStore).'__'; $linkStore[$key] = $match[0]; return $key; }, $text);

// Replace remaining URLs with an anchor tag
$text = preg_replace_callback("/(http|https|ftp|ftps)\:\/\/[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(\/\S*)?/", function($match) use (&$linkStore){ return '<a href="'. $match[0] .'">'. $match[0] .'</a>'; }, $text);

// Replace link markers with original
$text = str_replace(array_keys($linkStore), array_values($linkStore), $text);

echo '<pre>'.$text;

How to select top n rows from a datatable/dataview in ASP.NET

I just used Midhat's answer but appended CopyToDataTable() on the end.

The code below is an extension to the answer that I used to quickly enable some paging.

int pageNum = 1;
int pageSize = 25;

DataTable dtPage = dt.Rows.Cast<System.Data.DataRow>().Skip((pageNum - 1) * pageSize).Take(pageSize).CopyToDataTable();

What does "restore purchases" in In-App purchases mean?

You typically restore purchases with this code:

[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];

It will reinvoke -paymentQueue:updatedTransactions on the observer(s) for the purchased items. This is useful for users who reinstall the app after deletion or install it on a different device.

Not all types of In-App purchases can be restored.

In Java 8 how do I transform a Map<K,V> to another Map<K,V> using a lambda?

If you use Guava (v11 minimum) in your project you can use Maps::transformValues.

Map<String, Column> newColumnMap = Maps.transformValues(
  originalColumnMap,
  Column::new // equivalent to: x -> new Column(x) 
)

Note: The values of this map are evaluated lazily. If the transformation is expensive you can copy the result to a new map like suggested in the Guava docs.

To avoid lazy evaluation when the returned map doesn't need to be a view, copy the returned map into a new map of your choosing.

What does "Could not find or load main class" mean?

If this issue is Eclipse-related:

Try adding the project to your class path.

See the below image:

This method worked for me.

Test if remote TCP port is open from a shell script

nmap-ncat to test for local port that is not already in use

availabletobindon() {
  port="$1"
  nc -w 2 -i 1 localhost "$port" 2>&1 | grep -v -q 'Idle timeout expired'
  return "$?"
}

Hot to get all form elements values using jQuery?

The answer already been accepted, I just write a short technique for the same purpose.

var fieldPair = '';
$(":input").each(function(){
fieldPair += $(this).attr("name") + ':' + $(this).val() + ';';
});

console.log(fieldPair);

How to select specific form element in jQuery?

I know the question is about setting a input but just in case if you want to set a combobox then (I search net for it and didn't find anything and this place seems a right place to guide others)

If you had a form with ID attribute set (e.g. frm1) and you wanted to set a specific specific combobox, with no ID set but name attribute set (e.g. district); then use

_x000D_

$("#frm1 select[name='district'] option[value='NWFP']").attr('selected', true);

_x000D_

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>_x000D_
    <form id="frm1">_x000D_
        <select name="district">_x000D_
            <option value="" disabled="" selected="" hidden="">Area ...</option>_x000D_
            <option value="NWFP">NWFP</option>_x000D_
            <option value="FATA">FATA</option>_x000D_
        </select>_x000D_
    </form>

_x000D_

How to send a simple email from a Windows batch file?

If you can't follow Max's suggestion of installing Blat (or any other utility) on your server, then perhaps your server already has software installed that can send emails.

I know that both Oracle and SqlServer have the capability to send email. You might have to work with your DBA to get that feature enabled and/or get the privilege to use it. Of course I can see how that might present its own set of problems and red tape. Assuming you can access the feature, it is fairly simple to have a batch file login to a database and send mail.

A batch file can easily run a VBScript via CSCRIPT. A quick google search finds many links showing how to send email with VBScript. The first one I happened to look at was http://www.activexperts.com/activmonitor/windowsmanagement/adminscripts/enterprise/mail/. It looks straight forward.

Can Google Chrome open local links?

I've just came across the same problem and found the chrome extension Open IE.
That's the only one what works for me (Chrome V46 & V52). The only disadvantefge is, that you need to install an additional program, means you need admin rights.

Hide strange unwanted Xcode logs

Please find the below steps.

Select Product => Scheme => Edit Scheme or use shortcut : CMD + <
Select the Run option from left side.
On Environment Variables section, add the variable OS_ACTIVITY_MODE = disable

For more information please find the below GIF representation.

How do I get Month and Date of JavaScript in 2 digit format?

Tip from MDN :

function date_locale(thisDate, locale) {
  if (locale == undefined)
    locale = 'fr-FR';
  // set your default country above (yes, I'm french !)
  // then the default format is "dd/mm/YYY"

  if (thisDate == undefined) {
    var d = new Date();
  } else {
    var d = new Date(thisDate);
  }
  return d.toLocaleDateString(locale);
}

var thisDate = date_locale();
var dayN = thisDate.slice(0, 2);
var monthN = thisDate.slice(3, 5);
console.log(dayN);
console.log(monthN);

http://jsfiddle.net/v4qcf5x6/

Append a Lists Contents to another List C#

GlobalStrings.AddRange(localStrings);

That works.

Documentation: List<T>.AddRange(IEnumerable<T>).

Making a <button> that's a link in HTML

<a href="#"><button>Link Text</button></a>

You asked for a link that looks like a button, so use a link and a button :-) This will preserve default browser button styling. The button by itself does nothing, but clicking it activates its parent link.

Demo:

_x000D_

<a href="http://stackoverflow.com"><button>Link Text</button></a>

_x000D_

How do I remove duplicate items from an array in Perl?

The variable @array is the list with duplicate elements

%seen=();
@unique = grep { ! $seen{$_} ++ } @array;

How to do something before on submit?

make sure the submit button is not of type "submit", make it a button. Then use the onclick event to trigger some javascript. There you can do whatever you want before you actually post your data.

C# int to enum conversion

I'm pretty sure you can do explicit casting here.

foo f = (foo)value;

So long as you say the enum inherits(?) from int, which you have.

enum foo : int

EDIT Yes it turns out that by default, an enums underlying type is int. You can however use any integral type except char.

You can also cast from a value that's not in the enum, producing an invalid enum. I suspect this works by just changing the type of the reference and not actually changing the value in memory.

enum (C# Reference)
Enumeration Types (C# Programming Guide)

select the TOP N rows from a table

you can also check this link

SELECT * FROM master_question WHERE 1 ORDER BY question_id ASC LIMIT 20

for more detail click here

Leverage browser caching, how on apache or .htaccess?

This is what I use to control headers/caching, I'm not an Apache pro, so let me know if there is room for improvement, but I know that this has been working well on all of my sites for some time now.

Mod_expires

http://httpd.apache.org/docs/2.2/mod/mod_expires.html

This module controls the setting of the Expires HTTP header and the max-age directive of the Cache-Control HTTP header in server responses. The expiration date can set to be relative to either the time the source file was last modified, or to the time of the client access.

These HTTP headers are an instruction to the client about the document's validity and persistence. If cached, the document may be fetched from the cache rather than from the source until this time has passed. After that, the cache copy is considered "expired" and invalid, and a new copy must be obtained from the source.

# BEGIN Expires
<ifModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 1 seconds"
ExpiresByType text/html "access plus 1 seconds"
ExpiresByType image/gif "access plus 2592000 seconds"
ExpiresByType image/jpeg "access plus 2592000 seconds"
ExpiresByType image/png "access plus 2592000 seconds"
ExpiresByType text/css "access plus 604800 seconds"
ExpiresByType text/javascript "access plus 216000 seconds"
ExpiresByType application/x-javascript "access plus 216000 seconds"
</ifModule>
# END Expires

Mod_headers

http://httpd.apache.org/docs/2.2/mod/mod_headers.html

This module provides directives to control and modify HTTP request and response headers. Headers can be merged, replaced or removed.

# BEGIN Caching
<ifModule mod_headers.c>
<filesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=2592000, public"
</filesMatch>
<filesMatch "\.(css)$">
Header set Cache-Control "max-age=604800, public"
</filesMatch>
<filesMatch "\.(js)$">
Header set Cache-Control "max-age=216000, private"
</filesMatch>
<filesMatch "\.(xml|txt)$">
Header set Cache-Control "max-age=216000, public, must-revalidate"
</filesMatch>
<filesMatch "\.(html|htm|php)$">
Header set Cache-Control "max-age=1, private, must-revalidate"
</filesMatch>
</ifModule>
# END Caching

Cannot use Server.MapPath

Firt add a reference to System.web, if you don't have. Do that in the References folder.

You can then use Hosting.HostingEnvironment.MapPath(path);

Web Reference vs. Service Reference

If I understand your question right:

To add a .net 2.0 Web Service Reference instead of a WCF Service Reference, right-click on your project and click 'Add Service Reference.'

Then click "Advanced.." at the bottom left of the dialog.

Then click "Add Web Reference.." on the bottom left of the next dialog.

Now you can add a regular SOAP web reference like you are looking for.

How to remove all the punctuation in a string? (Python)

import string

asking = "".join(l for l in asking if l not in string.punctuation)

filter with string.punctuation.

Windows: XAMPP vs WampServer vs EasyPHP vs alternative

I'm using EasyPHP in making my Thesis about Content Management System. So far, this tool is very good and easy to use.

What is the Python 3 equivalent of "python -m SimpleHTTPServer"

In addition to Petr's answer, if you want to bind to a specific interface instead of all the interfaces you can use -b or --bind flag.

python -m http.server 8000 --bind 127.0.0.1

The above snippet should do the trick. 8000 is the port number. 80 is used as the standard port for HTTP communications.

Create Test Class in IntelliJ

Use @Test annotation on one of the test methods or annotate your test class with @RunWith(JMockit.class) if using jmock. Intellij should identify that as test class & enable navigation. Also make sure junit plugin is enabled.

Intersect Two Lists in C#

public static List<T> ListCompare<T>(List<T> List1 , List<T> List2 , string key )
{
    return List1.Select(t => t.GetType().GetProperty(key).GetValue(t))
                .Intersect(List2.Select(t => t.GetType().GetProperty(key).GetValue(t))).ToList();
}

System.Net.WebException HTTP status code

By using the null-conditional operator (?.) you can get the HTTP status code with a single line of code:

 HttpStatusCode? status = (ex.Response as HttpWebResponse)?.StatusCode;

The variable status will contain the HttpStatusCode. When the there is a more general failure like a network error where no HTTP status code is ever sent then status will be null. In that case you can inspect ex.Status to get the WebExceptionStatus.

If you just want a descriptive string to log in case of a failure you can use the null-coalescing operator (??) to get the relevant error:

string status = (ex.Response as HttpWebResponse)?.StatusCode.ToString()
    ?? ex.Status.ToString();

If the exception is thrown as a result of a 404 HTTP status code the string will contain "NotFound". On the other hand, if the server is offline the string will contain "ConnectFailure" and so on.

(And for anybody that wants to know how to get the HTTP substatus code. That is not possible. It is a Microsoft IIS concept that is only logged on the server and never sent to the client.)

scale fit mobile web content using viewport meta tag

Adding style="width:100%;max-width:640px" to the image tag will scale it up to the viewport width, i.e. for larger windows it will look fixed width.

jQuery / Javascript code check, if not undefined

I like this:

if (wlocation !== undefined)

But if you prefer the second way wouldn't be as you posted. It would be:

if (typeof wlocation  !== "undefined")

How do you uninstall the package manager "pip", if installed from source?

That way you haven't installed pip, you installed just the easy_install i.e. setuptools.

First you should remove all the packages you installed with easy_install using (see uninstall):

easy_install -m PackageName

This includes pip if you installed it using easy_install pip.

After this you remove the setuptools following the instructions from here:

If setuptools package is found in your global site-packages directory, you may safely remove the following file/directory:

setuptools-*.egg

If setuptools is installed in some other location such as the user site directory (eg: ~/.local, ~/Library/Python or %APPDATA%), then you may safely remove the following files:

pkg_resources.py
easy_install.py
setuptools/
setuptools-*.egg-info/

How do I update a GitHub forked repository?

The "Pull" app is an automatic set-up-and-forget solution. It will sync the default branch of your fork with the upstream repository.

Visit the URL, click the green "Install" button and select the repositories where you want to enable automatic synchronization.

The branch is updated once per hour directly on GitHub, on your local machine you need to pull the master branch to ensure that your local copy is in sync.

What XML parser should I use in C++?

Reading input files by line using read command in shell scripting skips last line

Use while loop like this:

while IFS= read -r line || [ -n "$line" ]; do
  echo "$line"
done <file

Or using grep with while loop:

while IFS= read -r line; do
  echo "$line"
done < <(grep "" file)

Using grep . instead of grep "" will skip the empty lines.

Note:

Using IFS= keeps any line indentation intact.
You should almost always use the -r option with read.
Don't read lines with for
File without a newline at the end isn't a standard unix text file.

What are WSDL, SOAP and REST?

Some clear explanations (for SOAP and WSDL) can be found here as well.

Difference between a SOAP message and a WSDL?

Accessing Redux state in an action creator?

There are differing opinions on whether accessing state in action creators is a good idea:

Redux creator Dan Abramov feels that it should be limited: "The few use cases where I think it’s acceptable is for checking cached data before you make a request, or for checking whether you are authenticated (in other words, doing a conditional dispatch). I think that passing data such as state.something.items in an action creator is definitely an anti-pattern and is discouraged because it obscured the change history: if there is a bug and items are incorrect, it is hard to trace where those incorrect values come from because they are already part of the action, rather than directly computed by a reducer in response to an action. So do this with care."
Current Redux maintainer Mark Erikson says it's fine and even encouraged to use getState in thunks - that's why it exists. He discusses the pros and cons of accessing state in action creators in his blog post Idiomatic Redux: Thoughts on Thunks, Sagas, Abstraction, and Reusability.

If you find that you need this, both approaches you suggested are fine. The first approach does not require any middleware:

import store from '../store';

export const SOME_ACTION = 'SOME_ACTION';
export function someAction() {
  return {
    type: SOME_ACTION,
    items: store.getState().otherReducer.items,
  }
}

However you can see that it relies on store being a singleton exported from some module. We don’t recommend that because it makes it much harder to add server rendering to your app because in most cases on the server you’ll want to have a separate store per request. So while technically this approach works, we don’t recommend exporting a store from a module.

This is why we recommend the second approach:

export const SOME_ACTION = 'SOME_ACTION';
export function someAction() {
  return (dispatch, getState) => {
    const {items} = getState().otherReducer;

    dispatch(anotherAction(items));
  }
}

It would require you to use Redux Thunk middleware but it works fine both on the client and on the server. You can read more about Redux Thunk and why it’s necessary in this case here.

Ideally, your actions should not be “fat” and should contain as little information as possible, but you should feel free to do what works best for you in your own application. The Redux FAQ has information on splitting logic between action creators and reducers and times when it may be useful to use getState in an action creator.

Laravel - check if Ajax request

Those who prefer to use laravel helpers they can check if a request is ajax using laravel request() helper.

if(request()->ajax())
   // code

Set drawable size programmatically

To use

textView.setCompoundDrawablesWithIntrinsicBounds()

Your minSdkVersion should be 17 in build.gradle

    defaultConfig {
    applicationId "com.example..."
    minSdkVersion 17
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"
}

To change drawable size:

    TextView v = (TextView)findViewById(email);
    Drawable dr = getResources().getDrawable(R.drawable.signup_mail);
    Bitmap bitmap = ((BitmapDrawable) dr).getBitmap();
    Drawable d = new BitmapDrawable(getResources(), Bitmap.createScaledBitmap(bitmap, 80, 80, true));

    //setCompoundDrawablesWithIntrinsicBounds (image to left, top, right, bottom)
    v.setCompoundDrawablesWithIntrinsicBounds(d,null,null,null);

Adding value labels on a matplotlib bar chart

If you want to just label the data points above the bar, you could use plt.annotate()

My code:

import numpy as np
import matplotlib.pyplot as plt

n = [1,2,3,4,5,]
s = [i**2 for i in n]
line = plt.bar(n,s)
plt.xlabel('Number')
plt.ylabel("Square")

for i in range(len(s)):
    plt.annotate(str(s[i]), xy=(n[i],s[i]), ha='center', va='bottom')

plt.show()

By specifying a horizontal and vertical alignment of 'center' and 'bottom' respectively one can get centered annotations.

Why do people write #!/usr/bin/env python on the first line of a Python script?

It tells the interpreter which version of python to run the program with when you have multiple versions of python.

scrollIntoView Scrolls just too far

If it's about 10px, then I guess you could simply manually adjust the containing div's scroll offset like that:

el.scrollIntoView(true);
document.getElementById("containingDiv").scrollTop -= 10;

C# - Multiple generic types in one list

Following leppie's answer, why not make MetaData an interface:

public interface IMetaData { }

public class Metadata<DataType> : IMetaData where DataType : struct
{
    private DataType mDataType;
}

How to make layout with View fill the remaining space?

use a Relativelayout to wrap LinearLayout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:round="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:orientation="vertical">
    <Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:text="&lt;"/>
    <TextView
        android:layout_width = "fill_parent"
        android:layout_height = "wrap_content"
        android:layout_weight = "1"/>
    <Button
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:text="&gt;"/>

</LinearLayout>

</RelativeLayout>`

Get JavaScript object from array of objects by value of property

If you are looking for a single result, rather than an array, may I suggest reduce?

Here is a solution in plain 'ole javascript that returns a matching object if one exists, or null if not.

var result = arr.reduce(function(prev, curr) { return (curr.b === 6) ? curr : prev; }, null);

How to use workbook.saveas with automatic Overwrite

To split the difference of opinion

I prefer:

   xls.DisplayAlerts = False    
   wb.SaveAs fullFilePath, AccessMode:=xlExclusive, ConflictResolution:=xlLocalSessionChanges
   xls.DisplayAlerts = True

The program can’t start because MSVCR71.dll is missing from your computer. Try reinstalling the program to fix this program

I found this error occurred when I was using the wrong version of Java. When I changed my environment from Java 7 down to Java 6 the error no longer appeared.

(The MSVCR71.DLL file is in the JDK 6 bin directory, where JDK 7 has MSVCR100.DLL.)

How to sort a dataframe by multiple column(s)

I learned about order with the following example which then confused me for a long time:

set.seed(1234)

ID        = 1:10
Age       = round(rnorm(10, 50, 1))
diag      = c("Depression", "Bipolar")
Diagnosis = sample(diag, 10, replace=TRUE)

data = data.frame(ID, Age, Diagnosis)

databyAge = data[order(Age),]
databyAge

The only reason this example works is because order is sorting by the vector Age, not by the column named Age in the data frame data.

To see this create an identical data frame using read.table with slightly different column names and without making use of any of the above vectors:

my.data <- read.table(text = '

  id age  diagnosis
   1  49 Depression
   2  50 Depression
   3  51 Depression
   4  48 Depression
   5  50 Depression
   6  51    Bipolar
   7  49    Bipolar
   8  49    Bipolar
   9  49    Bipolar
  10  49 Depression

', header = TRUE)

The above line structure for order no longer works because there is no vector named age:

databyage = my.data[order(age),]

The following line works because order sorts on the column age in my.data.

databyage = my.data[order(my.data$age),]

I thought this was worth posting given how confused I was by this example for so long. If this post is not deemed appropriate for the thread I can remove it.

EDIT: May 13, 2014

Below is a generalized way of sorting a data frame by every column without specifying column names. The code below shows how to sort from left to right or by right to left. This works if every column is numeric. I have not tried with a character column added.

I found the do.call code a month or two ago in an old post on a different site, but only after extensive and difficult searching. I am not sure I could relocate that post now. The present thread is the first hit for ordering a data.frame in R. So, I thought my expanded version of that original do.call code might be useful.

set.seed(1234)

v1  <- c(0,0,0,0, 0,0,0,0, 1,1,1,1, 1,1,1,1)
v2  <- c(0,0,0,0, 1,1,1,1, 0,0,0,0, 1,1,1,1)
v3  <- c(0,0,1,1, 0,0,1,1, 0,0,1,1, 0,0,1,1)
v4  <- c(0,1,0,1, 0,1,0,1, 0,1,0,1, 0,1,0,1)

df.1 <- data.frame(v1, v2, v3, v4) 
df.1

rdf.1 <- df.1[sample(nrow(df.1), nrow(df.1), replace = FALSE),]
rdf.1

order.rdf.1 <- rdf.1[do.call(order, as.list(rdf.1)),]
order.rdf.1

order.rdf.2 <- rdf.1[do.call(order, rev(as.list(rdf.1))),]
order.rdf.2

rdf.3 <- data.frame(rdf.1$v2, rdf.1$v4, rdf.1$v3, rdf.1$v1) 
rdf.3

order.rdf.3 <- rdf.1[do.call(order, as.list(rdf.3)),]
order.rdf.3

How do I select an element with its name attribute in jQuery?

it's very simple getting a name:

$('[name=elementname]');

Resource:

http://www.electrictoolbox.com/jquery-form-elements-by-name/ (google search: get element by name jQuery - first result)

java.lang.NoClassDefFoundError: org/json/JSONObject

Add json jar to your classpath

or use java -classpath json.jar ClassName

refer this

How can I check if two segments intersect?

Checking if line segments intersect is very easy with Shapely library using intersects method:

from shapely.geometry import LineString

line = LineString([(0, 0), (1, 1)])
other = LineString([(0, 1), (1, 0)])
print(line.intersects(other))
# True

line = LineString([(0, 0), (1, 1)])
other = LineString([(0, 1), (1, 2)])
print(line.intersects(other))
# False

Are there any standard exit status codes in Linux?

'1' >>> Catchall for general errors

'2' >>> Misuse of shell builtins (according to Bash documentation)

'126'>>> Command invoked cannot execute

'127'>>>"command not found"

'128'>>> Invalid argument to exit

'128+n'>>>Fatal error signal "n"

'130'>>> Script terminated by Control-C

'255'>>>Exit status out of range

This is for bash. However, for other applications, there are different exit codes.

Android-Studio upgraded from 0.1.9 to 0.2.0 causing gradle build errors now

Solution for me without reinstalling or creating a new project:

Step 1: Change line in build.gradle from:

dependencies {
    classpath 'com.android.tools.build:gradle:0.4'
}

dependencies {
    classpath 'com.android.tools.build:gradle:0.5.+'
}

Note: for newer versions of gradle you may need to change it to 0.6.+ instead.

Step 2: In the <YourProject>.iml file, delete the entire<component name="FacetManager">[...]</component> tag.

Step 3 (Maybe not necessary): In the Android SDK manager, install (if not already installed) Android Support Repository under Extras.

Info found here

Toolbar Navigation Hamburger Icon missing

in onCreate():

    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();
    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.open, R.string.close) {
        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            supportInvalidateOptionsMenu();
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            supportInvalidateOptionsMenu();
        }
    };
    drawerLayout.setDrawerListener(drawerToggle);


    drawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Backstack.get(MainActivity.this).goBack();
        }
    });
    //actionBar.setHomeAsUpIndicator(R.drawable.ic_menu);
    //getSupportActionBar().setDisplayHomeAsUpEnabled(false);
    actionBar.setDisplayHomeAsUpEnabled(false);
    actionBar.setHomeButtonEnabled(true);

And when setting up UP navigation:

private void setupViewsForKey(Key key) {
    if(key.shouldShowUp()) {
        drawerToggle.setDrawerIndicatorEnabled(false);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
    else {
        getSupportActionBar().setDisplayHomeAsUpEnabled(false);
        drawerToggle.setDrawerIndicatorEnabled(true);
    }
    drawerToggle.syncState();

ImportError: No module named 'bottle' - PyCharm

The settings are changed for PyCharm 5+.

Go to File > Default Settings
In left sidebar, click Default Project > Project Interpreter
At bottom of window, click + to install or - to uninstall.
If we click +, a new window opens where we can decrease the results by entering the package name/keyword.
Install the package.
Go to File > Invalidate caches/restart and click Invalidate and Restart to apply changes and restart PyCharm.

Settings

Install package

Can I do Android Programming in C++, C?

Yes, you can program Android apps in C++ (for the most part), using the Native Development Kit (NDK), although Java is the primary/preferred language for programming Android, and your C++ code will likely have to interface with Java components, and you'll likely need to read and understand the documentation for Java components, as well. Therefore, I'd advise you to use Java unless you have some existing C++ code base that you need to port and that isn't practical to rewrite in Java.

Java is very similar to C++, I don't think you will have any problems picking it up... going from C++ to Java is incredibly easy; going from Java to C++ is a little more difficult, though not terrible. Java for C++ Programmers does a pretty good job at explaining the differences. Writing your Android code in Java will be more idiomatic and will also make the development process easier for you (as the tooling for the Java Android SDK is significantly better than the corresponding NDK tooling)

In terms of setup, Google provides the Android Studio IDE for both Java and C++ Android development (with Gradle as the build system), but you are free to use whatever IDE or build system you want so long as, under the hood, you are using the Android SDK / NDK to produce the final outputs.

How to set a cron job to run every 3 hours

Change Minute to be 0. That's it :)

Note: you can check your "crons" in http://cronchecker.net/

Example

MongoDB Data directory /data/db not found

MongoDB needs data directory to store data. Default path is /data/db

When you start MongoDB engine, it searches this directory which is missing in your case. Solution is create this directory and assign rwx permission to user.

If you want to change the path of your data directory then you should specify it while starting mongod server like,

mongod --dbpath /data/<path> --port <port no>

This should help you start your mongod server with custom path and port.

Passing variables, creating instances, self, The mechanics and usage of classes: need explanation

So here is a simple example of how to use classes: Suppose you are a finance institute. You want your customer's accounts to be managed by a computer. So you need to model those accounts. That is where classes come in. Working with classes is called object oriented programming. With classes you model real world objects in your computer. So, what do we need to model a simple bank account? We need a variable that saves the balance and one that saves the customers name. Additionally, some methods to in- and decrease the balance. That could look like:

class bankaccount():
    def __init__(self, name, money):
        self.name = name
        self.money = money

    def earn_money(self, amount):
        self.money += amount

    def withdraw_money(self, amount):
        self.money -= amount

    def show_balance(self):
        print self.money

Now you have an abstract model of a simple account and its mechanism. The def __init__(self, name, money) is the classes' constructor. It builds up the object in memory. If you now want to open a new account you have to make an instance of your class. In order to do that, you have to call the constructor and pass the needed parameters. In Python a constructor is called by the classes's name:

spidermans_account = bankaccount("SpiderMan", 1000)

If Spiderman wants to buy M.J. a new ring he has to withdraw some money. He would call the withdraw method on his account:

spidermans_account.withdraw_money(100)

If he wants to see the balance he calls:

spidermans_account.show_balance()

The whole thing about classes is to model objects, their attributes and mechanisms. To create an object, instantiate it like in the example. Values are passed to classes with getter and setter methods like `earn_money()´. Those methods access your objects variables. If you want your class to store another object you have to define a variable for that object in the constructor.

Create tap-able "links" in the NSAttributedString of a UILabel?

I'd strongly recommend using a library that automatically detects URLs in text and converts them to links. Try:

TTTAttributedLabel (pod)
ZSWTappableLabel (pod).

Both are under MIT license.

Using margin / padding to space <span> from the rest of the <p>

JSFiddle

HTML:

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsa omnis obcaecati dolore reprehenderit praesentium. Nisi eius deleniti voluptates quis esse deserunt magni eum commodi nostrum facere pariatur sed eos voluptatum?

</p><span class="small-text">George Nelson 1955</span>

CSS:

p       {font-size:24px; font-weight: 300; -webkit-font-smoothing: subpixel-antialiased;}
p span  {font-size:16px; font-style: italic; margin-top:50px;}

.small-text{
font-size: 12px;
font-style: italic;
}

Best way to check for "empty or null value"

Checking for the length of the string also works and is compact:

where length(stringexpression) > 0;

Invisible characters - ASCII

Other answers are correct -- whether a character is invisible or not depends on what font you use. This seems to be a pretty good list to me of characters that are truly invisible (not even space). It contains some chars that the other lists are missing.

            '\u2060', // Word Joiner
            '\u2061', // FUNCTION APPLICATION
            '\u2062', // INVISIBLE TIMES
            '\u2063', // INVISIBLE SEPARATOR
            '\u2064', // INVISIBLE PLUS
            '\u2066', // LEFT - TO - RIGHT ISOLATE
            '\u2067', // RIGHT - TO - LEFT ISOLATE
            '\u2068', // FIRST STRONG ISOLATE
            '\u2069', // POP DIRECTIONAL ISOLATE
            '\u206A', // INHIBIT SYMMETRIC SWAPPING
            '\u206B', // ACTIVATE SYMMETRIC SWAPPING
            '\u206C', // INHIBIT ARABIC FORM SHAPING
            '\u206D', // ACTIVATE ARABIC FORM SHAPING
            '\u206E', // NATIONAL DIGIT SHAPES
            '\u206F', // NOMINAL DIGIT SHAPES
            '\u200B', // Zero-Width Space
            '\u200C', // Zero Width Non-Joiner
            '\u200D', // Zero Width Joiner
            '\u200E', // Left-To-Right Mark
            '\u200F', // Right-To-Left Mark
            '\u061C', // Arabic Letter Mark
            '\uFEFF', // Byte Order Mark
            '\u180E', // Mongolian Vowel Separator
            '\u00AD'  // soft-hyphen

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

Below code will return the days left from today to futures date.

Dependencies: jQuery and MomentJs.

var getDaysLeft = function (date) {
  var today = new Date();
  var daysLeftInMilliSec = Math.abs(new Date(moment(today).format('YYYY-MM-DD')) - new Date(date));
  var daysLeft = daysLeftInMilliSec / (1000 * 60 * 60 * 24);   
  return daysLeft;
};

getDaysLeft('YYYY-MM-DD');

Android: disabling highlight on listView click

Nothing helps me but this:

transparent_drawable.xml:

<?xml version="1.0" encoding="utf-8"?>    
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#00000000"/>
</shape>

layout.xml:

android:listSelector="@drawable/transparent_drawable"

Abort trap 6 error in C

Try this:

void drawInitialNim(int num1, int num2, int num3){
    int board[3][50] = {0}; // This is a local variable. It is not possible to use it after returning from this function. 

    int i, j, k;

    for(i=0; i<num1; i++)
        board[0][i] = 'O';
    for(i=0; i<num2; i++)
        board[1][i] = 'O';
    for(i=0; i<num3; i++)
        board[2][i] = 'O';

    for (j=0; j<3;j++) {
        for (k=0; k<50; k++) {
            if(board[j][k] != 0)
                printf("%c", board[j][k]);
        }
        printf("\n");
    }
}

java.sql.SQLException: - ORA-01000: maximum open cursors exceeded

Did you set autocommit=true? If not try this:

{ //method try starts  
    String sql = "INSERT into TblName (col1, col2) VALUES(?, ?)";
    Connection conn = obj.getConnection()
    pStmt = conn.prepareStatement(sql);

    for (String language : additionalLangs) {
        pStmt.setLong(1, subscriberID);
        pStmt.setInt(2, Integer.parseInt(language));
        pStmt.execute();
        conn.commit();
    }
} //method/try ends { 
    //finally starts
    pStmt.close()
} //finally ends

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