#Static polymorphism | Programs & Examples on Static polymorphism

Negative matching using grep (match lines that do not contain foo)

grep -v is your friend:

grep --help | grep invert

-v, --invert-match select non-matching lines

Also check out the related -L (the complement of -l).

-L, --files-without-match only print FILE names containing no match

how to check if input field is empty

Try this

$.trim($("#spa").val()).length > 0

It will not treat any white space if any as a correct value

Get root password for Google Cloud Engine VM

I had the same problem. Even after updating the password using sudo passwd it was not working. I had to give "multiple" roles for my user through IAM & Admin Refer Screen Shot on IAM & Admin screen of google cloud

After that i restarted the VM. Then again changed the password and then it worked.

user1@sap-hanaexpress-public-1-vm:~> sudo passwd
New password: 
Retype new password: 
passwd: password updated successfully
user1@sap-hanaexpress-public-1-vm:~> su
Password: 
sap-hanaexpress-public-1-vm:/home/user1 # whoami
root
sap-hanaexpress-public-1-vm:/home/user1 #

ModalPopupExtender OK Button click event not firing?

It could also be that the button needs to have CausesValidation="false". That worked for me.

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

I am from .net background. However, java/c# are more/less same.

If you instantiate a non-primitive type (array in your case), it won't be null.
e.g. int[] numbers = new int[3];
In this case, the space is allocated & each of the element has a default value of 0.

It will be null, when you don't new it up.
e.g.

int[] numbers = null; // changed as per @Joachim's suggestion.
if (numbers == null)
{
   System.out.println("yes, it is null. Please new it up");
}

Correct way to use Modernizr to detect IE?

If you're looking for a JS version (using a combination of feature detection and UA sniffing) of what html5 boilerplate used to do:

var IE = (!! window.ActiveXObject && +(/msie\s(\d+)/i.exec(navigator.userAgent)[1])) || NaN;
if (IE < 9) {
    document.documentElement.className += ' lt-ie9' + ' ie' + IE;
}

Displaying files (e.g. images) stored in Google Drive on a website

If you want to view the file in the browser, it's also possible using a similar method to the one provided by rufo and Torxed:

https://drive.google.com/uc?export=view&id={fileId}

SQL Call Stored Procedure for each Row without using a cursor

This is a variation on the answers already provided, but should be better performing because it doesn't require ORDER BY, COUNT or MIN/MAX. The only disadvantage with this approach is that you have to create a temp table to hold all the Ids (the assumption is that you have gaps in your list of CustomerIDs).

That said, I agree with @Mark Powell though that, generally speaking, a set based approach should still be better.

DECLARE @tmp table (Id INT IDENTITY(1,1) PRIMARY KEY NOT NULL, CustomerID INT NOT NULL)
DECLARE @CustomerId INT 
DECLARE @Id INT = 0

INSERT INTO @tmp SELECT CustomerId FROM Sales.Customer

WHILE (1=1)
BEGIN
    SELECT @CustomerId = CustomerId, @Id = Id
    FROM @tmp
    WHERE Id = @Id + 1

    IF @@rowcount = 0 BREAK;

    -- call your sproc
    EXEC dbo.YOURSPROC @CustomerId;
END

ASP.Net 2012 Unobtrusive Validation with jQuery

In the Nuget Package manager search for AspNet.ScriptManager.jQuery instead of jquery. THat way you will not have to set the mappings yourself and the project will work with the click of a simple install.

Or disable the Unobtrusive Validation by adding this line to the Configuration tag of the web.config file in the project.

  <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />

Open button in new window?

If you strictly want to stick to using button,Then simply create an open window function as follows:

    <script>
function myfunction() {
    window.open("mynewpage.html");
}
</script>

Then in your html do the following with your button:

Join

So you would have something like this:

 <body>
    <script>
function joinfunction() {
    window.open("mynewpage.html");
}
</script>
<button  onclick="myfunction()" type="button" class="btn btn-default subs-btn">Join</button>

Android Pop-up message

Suppose you want to set a pop-up text box for clicking a button lets say bt whose id is button, then code using Toast will somewhat look like this:

Button bt;
bt = (Button) findViewById(R.id.button);
bt.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {            
Toast.makeText(getApplicationContext(),"The text you want to display",Toast.LENGTH_LONG)
}

Reading from memory stream to string

string result = Encoding.UTF8.GetString((stream as MemoryStream).ToArray());

What's an easy way to read random line from a file in Unix command line?

perlfaq5: How do I select a random line from a file? Here's a reservoir-sampling algorithm from the Camel Book:

perl -e 'srand; rand($.) < 1 && ($line = $_) while <>; print $line;' file

This has a significant advantage in space over reading the whole file in. You can find a proof of this method in The Art of Computer Programming, Volume 2, Section 3.4.2, by Donald E. Knuth.

Is there a way to specify how many characters of a string to print out using printf()?

In C++ it is easy.

std::copy(someStr.c_str(), someStr.c_str()+n, std::ostream_iterator<char>(std::cout, ""));

EDIT: It is also safer to use this with string iterators, so you don't run off the end. I'm not sure what happens with printf and string that are too short, but I'm guess this may be safer.

Using jQuery UI sortable with HTML tables

You can call sortable on a <tbody> instead of on the individual rows.

<table>
    <tbody>
        <tr> 
            <td>1</td>
            <td>2</td>
        </tr>
        <tr>
            <td>3</td>
            <td>4</td> 
        </tr>
        <tr>
            <td>5</td>
            <td>6</td>
        </tr>  
    </tbody>    
</table>?

<script>
    $('tbody').sortable();
</script>

_x000D_

$(function() {_x000D_
  $( "tbody" ).sortable();_x000D_
});

_x000D_

 _x000D_
table {_x000D_
    border-spacing: collapse;_x000D_
    border-spacing: 0;_x000D_
}_x000D_
td {_x000D_
    width: 50px;_x000D_
    height: 25px;_x000D_
    border: 1px solid black;_x000D_
}

_x000D_

 _x000D_
_x000D_
<link href="//code.jquery.com/ui/1.11.1/themes/smoothness/jquery-ui.css" rel="stylesheet">_x000D_
<script src="//code.jquery.com/jquery-1.11.1.js"></script>_x000D_
<script src="//code.jquery.com/ui/1.11.1/jquery-ui.js"></script>_x000D_
_x000D_
<table>_x000D_
    <tbody>_x000D_
        <tr>_x000D_
            <td>1</td>_x000D_
            <td>2</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>3</td>_x000D_
            <td>4</td>_x000D_
        </tr>_x000D_
        <tr> _x000D_
            <td>5</td>_x000D_
            <td>6</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>7</td>_x000D_
            <td>8</td>_x000D_
        </tr>_x000D_
        <tr>_x000D_
            <td>9</td> _x000D_
            <td>10</td>_x000D_
        </tr>  _x000D_
    </tbody>    _x000D_
</table>

_x000D_

How to SELECT WHERE NOT EXIST using LINQ?

First of all, I suggest to modify a bit your sql query:

 select * from shift 
 where shift.shiftid not in (select employeeshift.shiftid from employeeshift 
                             where employeeshift.empid = 57);

This query provides same functionality. If you want to get the same result with LINQ, you can try this code:

//Variable dc has DataContext type here
//Here we get list of ShiftIDs from employeeshift table
List<int> empShiftIds = dc.employeeshift.Where(p => p.EmpID = 57).Select(s => s.ShiftID).ToList();

//Here we get the list of our shifts
List<shift> shifts = dc.shift.Where(p => !empShiftIds.Contains(p.ShiftId)).ToList();

How to read and write into file using JavaScript?

If you are using JScript (Microsoft's Javascript) to do local scripting using WSH (NOT in a browser!) you can use Scripting.FileSystemObject to access the file system.

I think you can access that same object in IE if you turn a lot of security settings off, but that would be a very, very bad idea.

MSDN here

Example to use shared_ptr?

#include <memory>
#include <iostream>

class SharedMemory {
    public: 
        SharedMemory(int* x):_capture(x){}
        int* get() { return (_capture.get()); }
    protected:
        std::shared_ptr<int> _capture;
};

int main(int , char**){
    SharedMemory *_obj1= new SharedMemory(new int(10));
    SharedMemory *_obj2 = new SharedMemory(*_obj1);
    std::cout << " _obj1: " << *_obj1->get() << " _obj2: " << *_obj2->get()
    << std::endl;
    delete _obj2;

    std::cout << " _obj1: " << *_obj1->get() << std::endl;
    delete _obj1;
    std::cout << " done " << std::endl;
}

This is an example of shared_ptr in action. _obj2 was deleted but pointer is still valid. output is, ./test _obj1: 10 _obj2: 10 _obj2: 10 done

Get response from PHP file using AJAX

var data="your data";//ex data="id="+id;
      $.ajax({
       method : "POST",
       url : "file name",  //url: "demo.php"
       data : "data",
       success : function(result){
               //set result to div or target 
              //ex $("#divid).html(result)
        }
   });

boolean in an if statement

First off, the facts:

if (booleanValue)

Will satisfy the if statement for any truthy value of booleanValue including true, any non-zero number, any non-empty string value, any object or array reference, etc...

On the other hand:

if (booleanValue === true)

This will only satisfy the if condition if booleanValue is exactly equal to true. No other truthy value will satisfy it.

On the other hand if you do this:

if (someVar == true)

Then, what Javascript will do is type coerce true to match the type of someVar and then compare the two variables. There are lots of situations where this is likely not what one would intend. Because of this, in most cases you want to avoid == because there's a fairly long set of rules on how Javascript will type coerce two things to be the same type and unless you understand all those rules and can anticipate everything that the JS interpreter might do when given two different types (which most JS developers cannot), you probably want to avoid == entirely.

As an example of how confusing it can be:

_x000D_

var x;_x000D_
_x000D_
x = 0;_x000D_
console.log(x == true);   // false, as expected_x000D_
console.log(x == false);  // true as expected_x000D_
_x000D_
x = 1;_x000D_
console.log(x == true);   // true, as expected_x000D_
console.log(x == false);  // false as expected_x000D_
_x000D_
x = 2;_x000D_
console.log(x == true);   // false, ??_x000D_
console.log(x == false);  // false

_x000D_

For the value 2, you would think that 2 is a truthy value so it would compare favorably to true, but that isn't how the type coercion works. It is converting the right hand value to match the type of the left hand value so its converting true to the number 1 so it's comparing 2 == 1 which is certainly not what you likely intended.

So, buyer beware. It's likely best to avoid == in nearly all cases unless you explicitly know the types you will be comparing and know how all the possible types coercion algorithms work.

So, it really depends upon the expected values for booleanValue and how you want the code to work. If you know in advance that it's only ever going to have a true or false value, then comparing it explicitly with

if (booleanValue === true)

is just extra code and unnecessary and

if (booleanValue)

is more compact and arguably cleaner/better.

If, on the other hand, you don't know what booleanValue might be and you want to test if it is truly set to true with no other automatic type conversions allowed, then

if (booleanValue === true)

is not only a good idea, but required.

For example, if you look at the implementation of .on() in jQuery, it has an optional return value. If the callback returns false, then jQuery will automatically stop propagation of the event. In this specific case, since jQuery wants to ONLY stop propagation if false was returned, they check the return value explicity for === false because they don't want undefined or 0 or "" or anything else that will automatically type-convert to false to also satisfy the comparison.

For example, here's the jQuery event handling callback code:

ret = ( specialHandle || handleObj.handler ).apply( matched.elem, args );

if ( ret !== undefined ) {
     event.result = ret;
     if ( ret === false ) {
         event.preventDefault();
         event.stopPropagation();
     }
 }

You can see that jQuery is explicitly looking for ret === false.

But, there are also many other places in the jQuery code where a simpler check is appropriate given the desire of the code. For example:

// The DOM ready check for Internet Explorer
function doScrollCheck() {
    if ( jQuery.isReady ) {
        return;
    }
    ...

How does one capture a Mac's command key via JavaScript?

Here is how I did it in AngularJS

app = angular.module('MM_Graph')

class Keyboard
  constructor: ($injector)->
    @.$injector  = $injector
    @.$window    = @.$injector.get('$window')                             # get reference to $window and $rootScope objects
    @.$rootScope = @.$injector.get('$rootScope')

  on_Key_Down:($event)=>
    @.$rootScope.$broadcast 'keydown', $event                             # broadcast a global keydown event

    if $event.code is 'KeyS' and ($event.ctrlKey or $event.metaKey)       # detect S key pressed and either OSX Command or Window's Control keys pressed
      @.$rootScope.$broadcast '', $event                                  # broadcast keyup_CtrS event
      #$event.preventDefault()                                             # this should be used by the event listeners to prevent default browser behaviour

  setup_Hooks: ()=>
    angular.element(@.$window).bind "keydown", @.on_Key_Down              # hook keydown event in window (only called once per app load)
    @

app.service 'keyboard', ($injector)=>
  return new Keyboard($injector).setup_Hooks()

Facebook API "This app is in development mode"

I have the same problem while integrating the Facebook SDK for login.

I'm suggesting below approach for development mode > you can test all things if you are login with same account, which is used for 'developers.facebook.com' and if you want to use another accounts then you need to add Roles for that particular app, for that you can add developer or testers by using fid or facebook username.

Eg: - Select the particular app > Roles and then add developer or testers.

web-api POST body object always null

I've hit this problem so many times, but actually, it's quite straightforward to track down the cause.

Here's today's example. I was calling my POST service with an AccountRequest object, but when I put a breakpoint at the start of this function, the parameter value was always null. But why ?!

[ProducesResponseType(typeof(DocumentInfo[]), 201)]
[HttpPost]
public async Task<IActionResult> Post([FromBody] AccountRequest accountRequest)
{
    //  At this point...  accountRequest is null... but why ?!

    //  ... other code ... 
}

To identify the problem, change the parameter type to string, add a line to get JSON.Net to deserialize the object into the type you were expecting, and put a breakpoint on this line:

[ProducesResponseType(typeof(DocumentInfo[]), 201)]
[HttpPost]
public async Task<IActionResult> Post([FromBody] string ar)
{
    //  Put a breakpoint on the following line... what is the value of "ar" ?
    AccountRequest accountRequest = JsonConvert.DeserializeObject<AccountRequest>(ar);

    //  ... other code ...
}

Now, when you try this, if the parameter is still blank or null, then you simply aren't calling the service properly.

However, if the string does contain a value, then the DeserializeObject should point you towards the cause of the problem, and should also fail to convert your string into your desired format. But with the raw (string) data which it's trying to deserialize, you should now be able to see what's wrong with your parameter value.

(In my case, we were calling the service with an AccountRequest object which had been accidentally serialized twice !)

Javascript Get Values from Multiple Select Option Box

Here i am posting the answer just for reference which may become useful.

<!DOCTYPE html>
<html>
<head>
<script>
function show()
{
     var InvForm = document.forms.form;
     var SelBranchVal = "";
     var x = 0;
     for (x=0;x<InvForm.kb.length;x++)
         {
            if(InvForm.kb[x].selected)
            {
             //alert(InvForm.kb[x].value);
             SelBranchVal = InvForm.kb[x].value + "," + SelBranchVal ;
            }
         }
         alert(SelBranchVal);
}
</script>
</head>
<body>
<form name="form">
<select name="kb" id="kb" onclick="show();" multiple>
<option value="India">India</option>
<option selected="selected" value="US">US</option>
<option value="UK">UK</option>
<option value="Japan">Japan</option>
</select>
<!--input type="submit" name="cmdShow" value="Customize Fields"
 onclick="show();" id="cmdShow" /-->
</form>
</body>
</html>

how to check for special characters php

preg_match('/'.preg_quote('^\'£$%^&*()}{@#~?><,@|-=-_+-¬', '/').'/', $string);

How to Solve the XAMPP 1.7.7 - PHPMyAdmin - MySQL Error #2002 in Ubuntu

Open config.default.php file under phpmyadmin/libraries/
Find $cfg['Servers'][$i]['host'] = 'localhost'; Change to $cfg['Servers'][$i]['host'] = '127.0.0.1';
refresh your phpmyadmin page, login

Is there a pretty print for PHP?

    <?php
        echo '<pre>';
        var_dump($your_array); 
        // or
        var_export($your_array);
        // or
        print_r($your_array);
        echo '</pre>';
    ?>

Or Use external libraries like REF: https://github.com/digitalnature/php-ref

How to create a fixed sidebar layout with Bootstrap 4?

I used this in my code:

<div class="sticky-top h-100">
    <nav id="sidebar" class="vh-100">
        ....

this cause your sidebar height become 100% and fixed at top.

How do you change the value inside of a textfield flutter?

The problem with just setting

_controller.text = "New value";

is that the cursor will be repositioned to the beginning (in material's TextField). Using

_controller.text = "Hello";
_controller.selection = TextSelection.fromPosition(
    TextPosition(offset: _controller.text.length),
);
setState(() {});

is not efficient since it rebuilds the widget more than it's necessary (when setting the text property and when calling setState).

I believe the best way is to combine everything into one simple command:

final _newValue = "New value";
_controller.value = TextEditingValue(
      text: _newValue,
      selection: TextSelection.fromPosition(
        TextPosition(offset: _newValue.length),
      ),
    );

It works properly for both Material and Cupertino Textfields.

Create array of regex matches

(4castle's answer is better than the below if you can assume Java >= 9)

You need to create a matcher and use that to iteratively find matches.

 import java.util.regex.Matcher;
 import java.util.regex.Pattern;

 ...

 List<String> allMatches = new ArrayList<String>();
 Matcher m = Pattern.compile("your regular expression here")
     .matcher(yourStringHere);
 while (m.find()) {
   allMatches.add(m.group());
 }

After this, allMatches contains the matches, and you can use allMatches.toArray(new String[0]) to get an array if you really need one.

You can also use MatchResult to write helper functions to loop over matches since Matcher.toMatchResult() returns a snapshot of the current group state.

For example you can write a lazy iterator to let you do

for (MatchResult match : allMatches(pattern, input)) {
  // Use match, and maybe break without doing the work to find all possible matches.
}

by doing something like this:

public static Iterable<MatchResult> allMatches(
      final Pattern p, final CharSequence input) {
  return new Iterable<MatchResult>() {
    public Iterator<MatchResult> iterator() {
      return new Iterator<MatchResult>() {
        // Use a matcher internally.
        final Matcher matcher = p.matcher(input);
        // Keep a match around that supports any interleaving of hasNext/next calls.
        MatchResult pending;

        public boolean hasNext() {
          // Lazily fill pending, and avoid calling find() multiple times if the
          // clients call hasNext() repeatedly before sampling via next().
          if (pending == null && matcher.find()) {
            pending = matcher.toMatchResult();
          }
          return pending != null;
        }

        public MatchResult next() {
          // Fill pending if necessary (as when clients call next() without
          // checking hasNext()), throw if not possible.
          if (!hasNext()) { throw new NoSuchElementException(); }
          // Consume pending so next call to hasNext() does a find().
          MatchResult next = pending;
          pending = null;
          return next;
        }

        /** Required to satisfy the interface, but unsupported. */
        public void remove() { throw new UnsupportedOperationException(); }
      };
    }
  };
}

With this,

for (MatchResult match : allMatches(Pattern.compile("[abc]"), "abracadabra")) {
  System.out.println(match.group() + " at " + match.start());
}

yields

a at 0
b at 1
a at 3
c at 4
a at 5
a at 7
b at 8
a at 10

VBA check if object is set

The (un)safe way to do this - if you are ok with not using option explicit - is...

Not TypeName(myObj) = "Empty"

This also handles the case if the object has not been declared. This is useful if you want to just comment out a declaration to switch off some behaviour...

Dim myObj as Object
Not TypeName(myObj) = "Empty"  '/ true, the object exists - TypeName is Object

'Dim myObj as Object
Not TypeName(myObj) = "Empty"  '/ false, the object has not been declared

This works because VBA will auto-instantiate an undeclared variable as an Empty Variant type. It eliminates the need for an auxiliary Boolean to manage the behaviour.

Logical operator in a handlebars.js {{#if}} conditional

In Ember.js you can use inline if helper in if block helper. It can replace || logical operator, for example:

{{#if (if firstCondition firstCondition secondCondition)}}
  (firstCondition || (or) secondCondition) === true
{{/if}}

Not able to change TextField Border Color

The best and most effective solution is just adding theme in your main class and add input decoration like these.

theme: ThemeData(
    inputDecorationTheme: InputDecorationTheme(
        border: OutlineInputBorder(
           borderSide: BorderSide(color: Colors.pink)
        )
    ),
)

C++ callback using class member

What you want to do is to make an interface which handles this code and all your classes implement the interface.

class IEventListener{
public:
   void OnEvent(int x) = 0;  // renamed Callback to OnEvent removed the instance, you can add it back if you want.
};


class MyClass :public IEventListener
{
    ...
    void OnEvent(int x); //typically such a function is NOT static. This wont work if it is static.
};

class YourClass :public IEventListener
{

Note that for this to work the "Callback" function is non static which i believe is an improvement. If you want it to be static, you need to do it as JaredC suggests with templates.

Handle Guzzle exception and get HTTP body

None of the above responses are working for error that has no body but still has some describing text. For me, it was SSL certificate problem: unable to get local issuer certificate error. So I looked right into the code, because doc does't really say much, and did this (in Guzzle 7.1):

try {
    // call here
} catch (\GuzzleHttp\Exception\RequestException $e) {
    if ($e->hasResponse()) {
        $response = $e->getResponse();
        // message is in $response->getReasonPhrase()
    } else {
        $response = $e->getHandlerContext();
        if (isset($response['error'])) {
            // message is in $response['error']
        } else {
            // Unknown error occured!
        }
    }
}

How can I start an Activity from a non-Activity class?

Once you have obtained the context in your onTap() you can also do:

Intent myIntent = new Intent(mContext, theNewActivity.class);
mContext.startActivity(myIntent);

How to append elements at the end of ArrayList in Java?

Here is the syntax, along with some other methods you might find useful:

    //add to the end of the list
    stringList.add(random);

    //add to the beginning of the list
    stringList.add(0,  random);

    //replace the element at index 4 with random
    stringList.set(4, random);

    //remove the element at index 5
    stringList.remove(5);

    //remove all elements from the list
    stringList.clear();

Execution Failed for task :app:compileDebugJavaWithJavac in Android Studio

This is because your $JAVA_HOME is not set. If you are using a Mac:

export JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.8.0_65.jdk/Contents/Home" in .bash_profile

c# how to add byte to byte array

Simple, just use the code below, as I do:

        public void AppendSpecifiedBytes(ref byte[] dst, byte[] src)
    {
        // Get the starting length of dst
        int i = dst.Length;
        // Resize dst so it can hold the bytes in src
        Array.Resize(ref dst, dst.Length + src.Length);
        // For each element in src
        for (int j = 0; j < src.Length; j++)
        {
            // Add the element to dst
            dst[i] = src[j];
            // Increment dst index
            i++;
        }
    }

    // Appends src byte to the dst array
    public void AppendSpecifiedByte(ref byte[] dst, byte src)
    {
        // Resize dst so that it can hold src
        Array.Resize(ref dst, dst.Length + 1);
        // Add src to dst
        dst[dst.Length - 1] = src;
    }

web.xml is missing and <failOnMissingWebXml> is set to true

It doesn't make sense to create a web.xml just elcipse wants it, even there is no need. This is the case if you have servlet conatiner embedded or living without xml cfg like spring-boot does. The you just diable JavaEE (useless stuff) in eclipse on project level or global

Eclipse/STS>Windows>Preferences>JavaEE>Doclet>Webdoclet> "uncheck" DeploymentDescriptor > OK

How to check if a "lateinit" variable has been initialized?

There is a lateinit improvement in Kotlin 1.2 that allows to check the initialization state of lateinit variable directly:

lateinit var file: File    

if (this::file.isInitialized) { ... }

See the annoucement on JetBrains blog or the KEEP proposal.

UPDATE: Kotlin 1.2 has been released. You can find lateinit enhancements here:

cast class into another class or convert class to another

You could change your class structure to:

public class maincs : sub1
{
   public int d; 
}

public class sub1
{
   public int a;
   public int b;
   public int c;
}

Then you could keep a list of sub1 and cast some of them to mainc.

What is the method for converting radians to degrees?

x rads in degrees - > x*180/pi
x degrees in rads -> x*pi/180

I guess if you wanted to make a function for this [in PHP]:

function convert($type, $num) {
    if ($type == "rads") {
          $result = $num*180/pi();
        }

    if ($type == "degs") {
          $result = $num*pi()/180;
        }

    return $result;
  }

Yes, that could probably be written better.

C# version of java's synchronized keyword?

static object Lock = new object();

lock (Lock) 
{
// do stuff
}

Why is semicolon allowed in this python snippet?

Python uses the ; as a separator, not a terminator. You can also use them at the end of a line, which makes them look like a statement terminator, but this is legal only because blank statements are legal in Python -- a line that contains a semicolon at the end is two statements, the second one blank.

Chrome & Safari Error::Not allowed to load local resource: file:///D:/CSS/Style.css

The solution is already answered here above (long ago).

But the implicit question "why does it work in FF and IE but not in Chrome and Safari" is found in the error text "Not allowed to load local resource": Chrome and Safari seem to use a more strict implementation of sandboxing (for security reasons) than the other two (at this time 2011).

This applies for local access. In a (normal) server environment (apache ...) the file would simply not have been found.

How to format strings using printf() to get equal length in the output

Additionally, if you want the flexibility of choosing the width, you can choose between one of the following two formats (with or without truncation):

int width = 30;
// No truncation uses %-*s
printf( "%-*s %s\n", width, "Starting initialization...", "Ok." );
// Output is "Starting initialization...     Ok."

// Truncated to the specified width uses %-.*s
printf( "%-.*s %s\n", width, "Starting initialization...", "Ok." );
// Output is "Starting initialization... Ok."

Making an image act like a button

You could implement a JavaScript block which contains a function with your needs.

<div style="position: absolute; left: 10px; top: 40px;"> 
    <img src="logg.png" width="114" height="38" onclick="DoSomething();" />
</div>

Remove the last three characters from a string

Easy. text = text.remove(text.length - 3). I subtracted 3 because the Remove function removes all items from that index to the end of the string which is text.length. So if I subtract 3 then I get the string with 3 characters removed from it.

You can generalize this to removing a characters from the end of the string, like this:

text = text.remove(text.length - a)

So what I did was the same logic. The remove function removes all items from its inside to the end of the string which is the length of the text. So if I subtract a from the length of the string that will give me the string with a characters removed.

So it doesn't just work for 3, it works for all positive integers, except if the length of the string is less than or equal to a, in that case it will return a negative number or 0.

Sass nth-child nesting

You're trying to do &(2), &(4) which won't work

#romtest {
  .detailed {
    th {
      &:nth-child(2) {//your styles here}
      &:nth-child(4) {//your styles here}
      &:nth-child(6) {//your styles here}
      }
  }
}

How to use onClick() or onSelect() on option tag in a JSP page?

 <div class="form-group">
         <script type="text/javascript"> 
              function activa(){                                                            
                 if(v==0)
                     document.formulario.vr_negativo.disabled = true; 
                 else if(v==1)
                      document.formulario.vr_negativo.disabled = true; 
                 else if(v==2)
                      document.formulario.vr_negativo.disabled = true; 
                 else if(v==3)
                      document.formulario.vr_negativo.disabled = true; 
                 else if(v==4)
                      document.formulario.vr_negativo.disabled = true; 
                 else if(v==5)
                      document.formulario.vr_negativo.disabled = true; 
                 else if(v==6)
                      document.formulario.vr_negativo.disabled = false;}                                                   
        </script> 
        <label>&iquest;Qu&eacute; tipo de veh&iacute;culo est&aacute; buscando?</label>
        <form name="formulario" id="formulario">
          <select name="lista" id="lista" onclick="activa(this.value)"> 
              <option value="0">Vehiculo para la familia</option> 
              <option value="1">Vehiculo para el trabajo</option> 
              <option value="2">Camioneta Familiar</option> 
              <option value="3">Camioneta de Carga</option> 
              <option value="4">Vehiculo servicio Publico</option>
              <option value="5">Vehiculo servicio Privado</option>
              <option value="6">Otro</option>
          </select> 
          <br />
          <input type="text" id="form vr_negativo" class="form-control input-xlarge" name="vr_negativo"/>
        </form>
  </div>

"cannot resolve symbol R" in Android Studio

You can delete one of your layout files (does not matter which one), after that you need to build project. Project will build and after that you need to return your layout file by CTRL + Z. In my case, if I tried to build my project before deleting of layout file, it did not help me. But this way is ok.

How to define two fields "unique" as couple

There is a simple solution for you called unique_together which does exactly what you want.

For example:

class MyModel(models.Model):
  field1 = models.CharField(max_length=50)
  field2 = models.CharField(max_length=50)

  class Meta:
    unique_together = ('field1', 'field2',)

And in your case:

class Volume(models.Model):
  id = models.AutoField(primary_key=True)
  journal_id = models.ForeignKey(Journals, db_column='jid', null=True, verbose_name = "Journal")
  volume_number = models.CharField('Volume Number', max_length=100)
  comments = models.TextField('Comments', max_length=4000, blank=True)

  class Meta:
    unique_together = ('journal_id', 'volume_number',)

Where is my m2 folder on Mac OS X Mavericks

It's in your home folder but it's hidden by default.

Typing the below commands in the terminal made it visible for me (only the .m2 folder that is, not all the other hidden folders).

> mv ~/.m2 ~/m2
> ln -s ~/m2 ~/.m2

Source

Setting new value for an attribute using jQuery

It is working you have to check attr after assigning value

LiveDemo

$('#amount').attr( 'datamin','1000');

alert($('#amount').attr( 'datamin'));?

Automatically run %matplotlib inline in IPython Notebook

In your ipython_config.py file, search for the following lines

# c.InteractiveShellApp.matplotlib = None

and

# c.InteractiveShellApp.pylab = None

and uncomment them. Then, change None to the backend that you're using (I use 'qt4') and save the file. Restart IPython, and matplotlib and pylab should be loaded - you can use the dir() command to verify which modules are in the global namespace.

npm ERR! registry error parsing json - While trying to install Cordova for Ionic Framework in Windows 8

I had similar problem. I r?n npm cache clear, closed android SDK manager(which was open before) and re-ran npm install -g cordova and that was enough to solve the problem.

How to replace an entire line in a text file by line number

Not the greatest, but this should work:

sed -i 'Ns/.*/replacement-line/' file.txt

where N should be replaced by your target line number. This replaces the line in the original file. To save the changed text in a different file, drop the -i option:

sed 'Ns/.*/replacement-line/' file.txt > new_file.txt

Javascript set img src

Instances of the image constructor are not meant to be used anywhere. You simply set the src, and the image preloads...and that's it, show's over. You can discard the object and move on.

document["pic1"].src = "XXXX/YYYY/search.png";

is what you should be doing. You can still use the image constructor, and perform the second action in the onload handler of your searchPic. This ensures the image is loaded before you set the src on the real img object.

Like so:

function LoadImages() {
    searchPic = new Image();
    searchPic.onload=function () {
        document["pic1"].src = "XXXX/YYYY/search.png";
    }
    searchPic.src = "XXXX/YYYY/search.png"; // This is correct and the path is correct
}

PHP Email sending BCC

You have $headers .= '...'; followed by $headers = '...';; the second line is overwriting the first.

Just put the $headers .= "Bcc: $emailList\r\n"; say after the Content-type line and it should be fine.

On a side note, the To is generally required; mail servers might mark your message as spam otherwise.

$headers  = "From: [email protected]\r\n" .
  "X-Mailer: php\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
$headers .= "Bcc: $emailList\r\n";

How to prevent scrollbar from repositioning web page?

Simply setting the width of your container element like this will do the trick

width: 100vw;

This will make that element ignore the scrollbar and it works with background color or images.

How to make a class property?

def _create_type(meta, name, attrs):
    type_name = f'{name}Type'
    type_attrs = {}
    for k, v in attrs.items():
        if type(v) is _ClassPropertyDescriptor:
            type_attrs[k] = v
    return type(type_name, (meta,), type_attrs)


class ClassPropertyType(type):
    def __new__(meta, name, bases, attrs):
        Type = _create_type(meta, name, attrs)
        cls = super().__new__(meta, name, bases, attrs)
        cls.__class__ = Type
        return cls


class _ClassPropertyDescriptor(object):
    def __init__(self, fget, fset=None):
        self.fget = fget
        self.fset = fset

    def __get__(self, obj, owner):
        if self in obj.__dict__.values():
            return self.fget(obj)
        return self.fget(owner)

    def __set__(self, obj, value):
        if not self.fset:
            raise AttributeError("can't set attribute")
        return self.fset(obj, value)

    def setter(self, func):
        self.fset = func
        return self


def classproperty(func):
    return _ClassPropertyDescriptor(func)



class Bar(metaclass=ClassPropertyType):
    __bar = 1

    @classproperty
    def bar(cls):
        return cls.__bar

    @bar.setter
    def bar(cls, value):
        cls.__bar = value

bar = Bar()
assert Bar.bar==1
Bar.bar=2
assert bar.bar==2
nbar = Bar()
assert nbar.bar==2

Loaded nib but the 'view' outlet was not set

If you're using a custom init method, check that you're returning something valid. I ran into a piece of code that crashed on something like this:

- (id)init {
   self = [super init];
   if (self) {
      CustomController *controller = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass(className) owner:self options:nil];
   } return self;
}

In another class, the controller was created like so:

CustomController *controller = [[CustomController alloc] init];

The problem is that in the init method, self hasn't changed and should look like this instead:

- (id)init {
   self = [super init];
   if (self) {
      CustomController *controller = [[NSBundle mainBundle] loadNibNamed:NSStringFromClass(className) owner:self options:nil];
      [controller viewDidLoad];
      self = controller;
   } return self;
}

Is a view faster than a simple query?

In SQL Server at least, Query plans are stored in the plan cache for both views and ordinary SQL queries, based on query/view parameters. For both, they are dropped from the cache when they have been unused for a long enough period and the space is needed for some other newly submitted query. After which, if the same query is issued, it is recompiled and the plan is put back into the cache. So no, there is no difference, given that you are reusing the same SQL query and the same view with the same frequency.

Obviously, in general, a view, by it's very nature (That someone thought it was to be used often enough to make it into a view) is generally more likely to be "reused" than any arbitrary SQL statement.

Pad a number with leading zeros in JavaScript

For fun, instead of using a loop to create the extra zeros:

function zeroPad(n,length){
  var s=n+"",needed=length-s.length;
  if (needed>0) s=(Math.pow(10,needed)+"").slice(1)+s;
  return s;
}

Convert a Python list with strings all to lowercase or uppercase

If your purpose is to matching with another string by converting in one pass, you can use str.casefold() as well.

This is useful when you have non-ascii characters and matching with ascii versions(eg: maße vs masse).Though str.lower or str.upper fails in such cases, str.casefold() will pass. This is available in Python 3 and the idea is discussed in detail with the answer https://stackoverflow.com/a/31599276/4848659.

>>>str="Hello World";
>>>print(str.lower());
hello world
>>>print(str.upper());
HELLO WOLRD
>>>print(str.casefold());
hello world

How to embed a PDF?

<iframe src="http://docs.google.com/gview?url=http://domain.com/pdf.pdf&embedded=true" 
style="width:600px; height:500px;" frameborder="0"></iframe>

Google docs allows you to embed PDFs, Microsoft Office Docs, and other applications by just linking to their services with an iframe. Its user-friendly, versatile, and attractive.

Create Table from View

Select 
    MonthEndDate MED,  
    SUM(GrossBalance/1000000) GrossBalance,
    PortfolioRename PR 
into 
    testDynamic 
from 
    Risk_PortfolioOverview  
    Group By MonthEndDate, PortfolioRename

Converting a sentence string to a string array of words in Java

I already did post this answer somewhere, i will do it here again. This version doesn't use any major inbuilt method. You got the char array, convert it into a String. Hope it helps!

import java.util.Scanner;

public class SentenceToWord 
{
    public static int getNumberOfWords(String sentence)
    {
        int counter=0;
        for(int i=0;i<sentence.length();i++)
        {
            if(sentence.charAt(i)==' ')
            counter++;
        }
        return counter+1;
    }

    public static char[] getSubString(String sentence,int start,int end) //method to give substring, replacement of String.substring() 
    {
        int counter=0;
        char charArrayToReturn[]=new char[end-start];
        for(int i=start;i<end;i++)
        {
            charArrayToReturn[counter++]=sentence.charAt(i);
        }
        return charArrayToReturn;
    }

    public static char[][] getWordsFromString(String sentence)
    {
        int wordsCounter=0;
        int spaceIndex=0;
        int length=sentence.length();
        char wordsArray[][]=new char[getNumberOfWords(sentence)][]; 
        for(int i=0;i<length;i++)
        {
            if(sentence.charAt(i)==' ' || i+1==length)
            {
            wordsArray[wordsCounter++]=getSubString(sentence, spaceIndex,i+1); //get each word as substring
            spaceIndex=i+1; //increment space index
            }
        }
        return  wordsArray; //return the 2 dimensional char array
    }


    public static void main(String[] args) 
    {
    System.out.println("Please enter the String");
    Scanner input=new Scanner(System.in);
    String userInput=input.nextLine().trim();
    int numOfWords=getNumberOfWords(userInput);
    char words[][]=new char[numOfWords+1][];
    words=getWordsFromString(userInput);
    System.out.println("Total number of words found in the String is "+(numOfWords));
    for(int i=0;i<numOfWords;i++)
    {
        System.out.println(" ");
        for(int j=0;j<words[i].length;j++)
        {
        System.out.print(words[i][j]);//print out each char one by one
        }
    }
    }

}

In Powershell what is the idiomatic way of converting a string to an int?

You can use the -as operator. If casting succeed you get back a number:

$numberAsString -as [int]

How do I register a DLL file on Windows 7 64-bit?

Type regsvr32 name.dll into the Command Prompt (executed in elevated mode!) and press "Enter." Note that name.dll should be replaced with the name of the DLL that you want to register. For example, if you want to register the iexplore.dll, type regsvr32 iexplore.dll.

Spring Boot access static resources missing scr/main/resources

Because java.net.URL is not adequate for handling all kinds of low level resources, Spring introduced org.springframework.core.io.Resource. To access resources, we can use @Value annotation or ResourceLoader class. @Autowired private ResourceLoader resourceLoader;

@Override public void run(String... args) throws Exception {

    Resource res = resourceLoader.getResource("classpath:thermopylae.txt");

    Map<String, Integer> words =  countWords.getWordsCount(res);

    for (String key : words.keySet()) {

        System.out.println(key + ": " + words.get(key));
    }
}

Best way to get value from Collection by index

In general, there is no good way, as Collections are not guaranteed to have fixed indices. Yes, you can iterate through them, which is how toArray (and other functions) work. But the iteration order isn't necessarily fixed, and if you're trying to index into a general Collection, you're probably doing something wrong. It would make more sense to index into a List.

Detect IF hovering over element with jQuery

You can filter your elment from all hovered elements. Problematic code:

element.filter(':hover')

Save code:

jQuery(':hover').filter(element)

To return boolean:

jQuery(':hover').filter(element).length===0

bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

Blank parameter will result in a warning for best available.
soup = BeautifulSoup(html)

---------------/UserWarning: No parser was explicitly specified, so I'm using the best available HTML parser for this system ("html5lib"). This usually isn't a problem, but if you run this code on another system, or in a different virtual environment, it may use a different parser and behave differently.----------------------/

python --version Python 3.7.7

PyCharm 19.3.4 CE

C# - Insert a variable number of spaces into a string? (Formatting an output file)

I agree with Justin, and the WhiteSpace CHAR can be referenced using ASCII codes here Character number 32 represents a white space, Therefore:

string.Empty.PadRight(totalLength, (char)32);

An alternative approach: Create all spaces manually within a custom method and call it:

private static string GetSpaces(int totalLength)
    {
        string result = string.Empty;
        for (int i = 0; i < totalLength; i++)
        {
            result += " ";
        }
        return result;
    }

And call it in your code to create white spaces: GetSpaces(14);

Hiding elements in responsive layout?

In boostrap 4.1 (run snippet because I copied whole table code from Bootstrap documentation):

_x000D_

.fixed_headers {_x000D_
  width: 750px;_x000D_
  table-layout: fixed;_x000D_
  border-collapse: collapse;_x000D_
}_x000D_
.fixed_headers th {_x000D_
  text-decoration: underline;_x000D_
}_x000D_
.fixed_headers th,_x000D_
.fixed_headers td {_x000D_
  padding: 5px;_x000D_
  text-align: left;_x000D_
}_x000D_
.fixed_headers td:nth-child(1),_x000D_
.fixed_headers th:nth-child(1) {_x000D_
  min-width: 200px;_x000D_
}_x000D_
.fixed_headers td:nth-child(2),_x000D_
.fixed_headers th:nth-child(2) {_x000D_
  min-width: 200px;_x000D_
}_x000D_
.fixed_headers td:nth-child(3),_x000D_
.fixed_headers th:nth-child(3) {_x000D_
  width: 350px;_x000D_
}_x000D_
.fixed_headers thead {_x000D_
  background-color: #333;_x000D_
  color: #FDFDFD;_x000D_
}_x000D_
.fixed_headers thead tr {_x000D_
  display: block;_x000D_
  position: relative;_x000D_
}_x000D_
.fixed_headers tbody {_x000D_
  display: block;_x000D_
  overflow: auto;_x000D_
  width: 100%;_x000D_
  height: 300px;_x000D_
}_x000D_
.fixed_headers tbody tr:nth-child(even) {_x000D_
  background-color: #DDD;_x000D_
}_x000D_
.old_ie_wrapper {_x000D_
  height: 300px;_x000D_
  width: 750px;_x000D_
  overflow-x: hidden;_x000D_
  overflow-y: auto;_x000D_
}_x000D_
.old_ie_wrapper tbody {_x000D_
  height: auto;_x000D_
}

_x000D_

<table class="fixed_headers">_x000D_
  <thead>_x000D_
    <tr>_x000D_
      <th>Screen Size</th>_x000D_
      <th>Class</th>_x000D_
    </tr>_x000D_
  </thead>_x000D_
  <tbody>_x000D_
    <tr>_x000D_
      <td>Hidden on all</td>_x000D_
      <td><code class="highlighter-rouge">.d-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Hidden only on xs</td>_x000D_
      <td><code class="highlighter-rouge">.d-none .d-sm-block</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Hidden only on sm</td>_x000D_
      <td><code class="highlighter-rouge">.d-sm-none .d-md-block</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Hidden only on md</td>_x000D_
      <td><code class="highlighter-rouge">.d-md-none .d-lg-block</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Hidden only on lg</td>_x000D_
      <td><code class="highlighter-rouge">.d-lg-none .d-xl-block</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Hidden only on xl</td>_x000D_
      <td><code class="highlighter-rouge">.d-xl-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible on all</td>_x000D_
      <td><code class="highlighter-rouge">.d-block</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible only on xs</td>_x000D_
      <td><code class="highlighter-rouge">.d-block .d-sm-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible only on sm</td>_x000D_
      <td><code class="highlighter-rouge">.d-none .d-sm-block .d-md-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible only on md</td>_x000D_
      <td><code class="highlighter-rouge">.d-none .d-md-block .d-lg-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible only on lg</td>_x000D_
      <td><code class="highlighter-rouge">.d-none .d-lg-block .d-xl-none</code></td>_x000D_
    </tr>_x000D_
    <tr>_x000D_
      <td>Visible only on xl</td>_x000D_
      <td><code class="highlighter-rouge">.d-none .d-xl-block</code></td>_x000D_
    </tr>_x000D_
  </tbody>_x000D_
</table>

_x000D_

https://getbootstrap.com/docs/4.1/utilities/display/#hiding-elements

Netbeans - Error: Could not find or load main class

You can solve it in these steps

Right-click on the project in the left toolbar.
Click on properties.
Click on Run
Click the browse button on the right side.(select your main class)
Click ok

JavaScript: Alert.Show(message) From ASP.NET Code-behind

Try this method:

public static void Show(string message) 
{                
    string cleanMessage = message.Replace("'", "\'");                               
    Page page = HttpContext.Current.CurrentHandler as Page; 
    string script = string.Format("alert('{0}');", cleanMessage);
    if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert")) 
    {
        page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, true /* addScriptTags */);
    } 
}

In Vb.Net

Public Sub Show(message As String)
    Dim cleanMessage As String = message.Replace("'", "\'")
    Dim page As Page = HttpContext.Current.CurrentHandler
    Dim script As String = String.Format("alert('{0}');", cleanMessage)
    If (page IsNot Nothing And Not page.ClientScript.IsClientScriptBlockRegistered("alert")) Then
        page.ClientScript.RegisterClientScriptBlock(page.GetType(), "alert", script, True) ' /* addScriptTags */
    End If
End Sub

Installing R with Homebrew

As of 2017 / Brew 1.3.2 @ macOS Sierra 10.12.6 all you have to do is:

$ brew install r

You don't even need to tap homebrew/science since r is now a part of core formulae for the Homebrew (homebrew-core).

It will also install all dependencies automatically:

==> Installing dependencies for r: gmp, mpfr, libmpc, isl, gcc

There are two additional options you might want to know:

--with-java
Build with java support
--with-openblas
Build with openblas support

How to get list of all installed packages along with version in composer?

If you want to install Symfony2.2, you can see the complete change in your composer.json on the Symfony blog.

Just update your file according to that and run composer update after that. That will install all new dependencies and Symfony2.2 on your project.

If you don't want to update to Symfony2.2, but have dependency errors, you should post these, so we can help you further.

How to import a CSS file in a React Component

You need to use css-loader when creating bundle with webpack.

Install it:

npm install css-loader --save-dev

And add it to loaders in your webpack configs:

module.exports = {
  module: {
    loaders: [
      { test: /\.css$/, loader: "style-loader!css-loader" },
      // ...
    ]
  }
};

After this, you will be able to include css files in js.

How to open adb and use it to send commands

You should find it in :

C:\Users\User Name\AppData\Local\Android\sdk\platform-tools

Add that to path, or change directory to there. The command sqlite3 is also there.

In the terminal you can type commands like

adb logcat //for logs
adb shell // for android shell

jQuery count child elements

pure js

selected.children[0].children.length;

_x000D_

let num = selected.children[0].children.length;_x000D_
_x000D_
console.log(num);

_x000D_

<div id="selected">_x000D_
  <ul>_x000D_
    <li>29</li>_x000D_
    <li>16</li>_x000D_
    <li>5</li>_x000D_
    <li>8</li>_x000D_
    <li>10</li>_x000D_
    <li>7</li>_x000D_
  </ul>_x000D_
</div>

_x000D_

How do search engines deal with AngularJS applications?

As of now Google has changed their AJAX crawling proposal.

Times have changed. Today, as long as you're not blocking Googlebot from crawling your JavaScript or CSS files, we are generally able to render and understand your web pages like modern browsers.

tl;dr: [Google] are no longer recommending the AJAX crawling proposal [Google] made back in 2009.

Round to at most 2 decimal places (only if necessary)

You could also override the Math.round function to do the rounding correct and add a parameter for decimals and use it like: Math.round(Number, Decimals). Keep in mind that this overrides the built in component Math.round and giving it another property then it original is.

var round = Math.round;
Math.round = function (value, decimals) {
  decimals = decimals || 0;
  return Number(round(value + 'e' + decimals) + 'e-' + decimals);
}

Then you can simply use it like this:

Math.round(1.005, 2);

https://jsfiddle.net/k5tpq3pd/3/

Difference between applicationContext.xml and spring-servlet.xml in Spring Framework

Application contexts provide a means for resolving text messages, including support for i18n of those messages. Application contexts provide a generic way to load file resources, such as images. Application contexts can publish events to beans that are registered as listeners. Certain operations on the container or beans in the container, which have to be handled in a programmatic fashion with a bean factory, can be handled declaratively in an application context. ResourceLoader support: Spring’s Resource interface us a flexible generic abstraction for handling low-level resources. An application context itself is a ResourceLoader, Hence provides an application with access to deployment-specific Resource instances. MessageSource support: The application context implements MessageSource, an interface used to obtain localized messages, with the actual implementation being pluggable

set the iframe height automatically

If the sites are on separate domains, the calling page can't access the height of the iframe due to cross-browser domain restrictions. If you have access to both sites, you may be able to use the [document domain hack].1 Then anroesti's links should help.

How to copy the first few lines of a giant file, and add a line of text at the end of it using some Linux commands?

I am assuming what you are trying to achieve is to insert a line after the first few lines of of a textfile.

head -n10 file.txt >> newfile.txt
echo "your line >> newfile.txt
tail -n +10 file.txt >> newfile.txt

If you don't want to rest of the lines from the file, just skip the tail part.

How to align form at the center of the page in html/css

I would just use table and not the form. Its done by using margin.

table {
  margin: 0 auto;
}

also try using something like

table td {
    padding-bottom: 5px;
}

instead of <br />

and also your input should end with /> e.g:

<input type="password" name="cpwd" />

How to add data into ManyToMany field?

There's a whole page of the Django documentation devoted to this, well indexed from the contents page.

As that page states, you need to do:

my_obj.categories.add(fragmentCategory.objects.get(id=1))

my_obj.categories.create(name='val1')

Detect rotation of Android phone in the browser with JavaScript

you can try the solution, compatible with all browser.

Following is orientationchange compatibility pic: therefore, I author a orientaionchange polyfill, it is a based on @media attribute to fix orientationchange utility library——orientationchange-fix

window.addEventListener('orientationchange', function(){
 if(window.neworientation.current === 'portrait|landscape'){
    // do something……
 } else {
    // do something……
 }
}, false);

Java BigDecimal: Round to the nearest whole value

You can use setScale() to reduce the number of fractional digits to zero. Assuming value holds the value to be rounded:

BigDecimal scaled = value.setScale(0, RoundingMode.HALF_UP);
System.out.println(value + " -> " + scaled);

Using round() is a bit more involved as it requires you to specify the number of digits to be retained. In your examples this would be 3, but this is not valid for all values:

BigDecimal rounded = value.round(new MathContext(3, RoundingMode.HALF_UP));
System.out.println(value + " -> " + rounded);

(Note that BigDecimal objects are immutable; both setScale and round will return a new object.)

Syntax for creating a two-dimensional array in Java

We can declare a two dimensional array and directly store elements at the time of its declaration as:

int marks[][]={{50,60,55,67,70},{62,65,70,70,81},{72,66,77,80,69}};

Here int represents integer type elements stored into the array and the array name is 'marks'. int is the datatype for all the elements represented inside the "{" and "}" braces because an array is a collection of elements having the same data type.

Coming back to our statement written above: each row of elements should be written inside the curly braces. The rows and the elements in each row should be separated by a commas.

Now observe the statement: you can get there are 3 rows and 5 columns, so the JVM creates 3 * 5 = 15 blocks of memory. These blocks can be individually referred ta as:

marks[0][0]  marks[0][1]  marks[0][2]  marks[0][3]  marks[0][4]
marks[1][0]  marks[1][1]  marks[1][2]  marks[1][3]  marks[1][4]
marks[2][0]  marks[2][1]  marks[2][2]  marks[2][3]  marks[2][4]

NOTE:
If you want to store n elements then the array index starts from zero and ends at n-1. Another way of creating a two dimensional array is by declaring the array first and then allotting memory for it by using new operator.

int marks[][];           // declare marks array
marks = new int[3][5];   // allocate memory for storing 15 elements

By combining the above two we can write:

int marks[][] = new int[3][5];

How to get Git to clone into current directory

To be sure that you could clone the repo, go to any temporary directory and clone the project there:

git clone ssh://[email protected]/home/user/private/repos/project_hub.git

This will clone your stuff into a project_hub directory.

Once the cloning has finished, you could move this directory wherever you want:

mv project_hub /path/to/new/location

This is safe and doesn't require any magical stuff around.

Project vs Repository in GitHub

In general, on GitHub, 1 repository = 1 project. For example: https://github.com/spring-projects/spring-boot . But it isn't a hard rule.

1 repository = many projects. For example: https://github.com/donhuvy/java_examples

1 projects = many repositories. For example: https://github.com/zendframework/zendframework (1 project named Zend Framework 3 has 61 + 1 = 62 repositories, don't believe? let count Zend Frameworks' modules + main repository)

I totally agree with @Brandon Ibbotson's comment:

A GitHub repository is just a "directory" where folders and files can exist.

How would I check a string for a certain letter in Python?

in keyword allows you to loop over a collection and check if there is a member in the collection that is equal to the element.

In this case string is nothing but a list of characters:

dog = "xdasds"
if "x" in dog:
     print "Yes!"

You can check a substring too:

>>> 'x' in "xdasds"
True
>>> 'xd' in "xdasds"
True
>>> 
>>> 
>>> 'xa' in "xdasds"
False

Think collection:

>>> 'x' in ['x', 'd', 'a', 's', 'd', 's']
True
>>>

You can also test the set membership over user defined classes.

For user-defined classes which define the __contains__ method, x in y is true if and only if y.__contains__(x) is true.

Save and retrieve image (binary) from SQL Server using Entity Framework 6

Convert the image to a byte[] and store that in the database.

Add this column to your model:

public byte[] Content { get; set; }

Then convert your image to a byte array and store that like you would any other data:

public byte[] ImageToByteArray(System.Drawing.Image imageIn)
{
    using(var ms = new MemoryStream())
    {
        imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);

        return ms.ToArray();
    }
}

public Image ByteArrayToImage(byte[] byteArrayIn)
{
     using(var ms = new MemoryStream(byteArrayIn))
     {
         var returnImage = Image.FromStream(ms);

         return returnImage;
     }
}

Source: Fastest way to convert Image to Byte array

var image = new ImageEntity()
{
   Content = ImageToByteArray(image)
};

_context.Images.Add(image);
_context.SaveChanges();

When you want to get the image back, get the byte array from the database and use the ByteArrayToImage and do what you wish with the Image

This stops working when the byte[] gets to big. It will work for files under 100Mb

How to push JSON object in to array using javascript

var postdata = {created_at: "2017-03-14T01:00:32Z", entry_id: 33358, field1: "4", field2: "4", field3: "0"};

var data = [];
data.push(postdata);

console.log(data);

How do I make a Git commit in the past?

In my case, while using the --date option, my git process crashed. May be I did something terrible. And as a result some index.lock file appeared. So I manually deleted the .lock files from .git folder and executed, for all modified files to be commited in passed dates and it worked this time. Thanx for all the answers here.

git commit --date="`date --date='2 day ago'`" -am "update"

Git submodule head 'reference is not a tree' error

To sync the git repo with the submodule's head, in case that is really what you want, I found that removing the submodule and then readding it avoids the tinkering with the history. Unfortunately removing a submodule requires hacking rather than being a single git command, but doable.

Steps I followed to remove the submodule, inspired by https://gist.github.com/kyleturner/1563153:

Run git rm --cached
Delete the relevant lines from the .gitmodules file.
Delete the relevant section from .git/config.
Delete the now untracked submodule files.
Remove directory .git/modules/

Again, this can be useful if all you want is to point at the submodule's head again, and you haven't complicated things by needing to keep the local copy of the submodule intact. It assumes you have the submodule "right" as its own repo, wherever the origin of it is, and you just want to get back to properly including it as a submodule.

Note: always make a full copy of your project before engaging in these kinds of manipulation or any git command beyond simple commit or push. I'd advise that with all other answers as well, and as a general git guideline.

How to set IntelliJ IDEA Project SDK

For IntelliJ IDEA 2017.2 I did the following to fix this issue: Go to your project structure Now go to SDKs under platform settings and click the green add button. Add your JDK path. In my case it was this path C:\Program Files\Java\jdk1.8.0_144 Now Just go Project under Project settings and select the project SDK.

Strip off URL parameter with PHP

In a different thread Justin suggests that the fastest way is to use strtok()

 $url = strtok($url, '?');

See his full answer with speed tests as well here: https://stackoverflow.com/a/1251650/452515

Append TimeStamp to a File Name

For Current date and time as the name for a file on the file system. Now call the string.Format method, and combine it with DateTime.Now, for a method that outputs the correct string based on the date and time.

using System;
using System.IO;

class Program
{
    static void Main()
    {
        //
        // Write file containing the date with BIN extension
        //
        string n = string.Format("text-{0:yyyy-MM-dd_hh-mm-ss-tt}.bin",
            DateTime.Now);
        File.WriteAllText(n, "abc");
    }
}

Output :

C:\Users\Fez\Documents\text-2020-01-08_05-23-13-PM.bin

"text-{0:yyyy-MM-dd_hh-mm-ss-tt}.bin"

text- The first part of the output required Files will all start with text-

{0: Indicates that this is a string placeholder The zero indicates the index of the parameters inserted here

yyyy- Prints the year in four digits followed by a dash This has a "year 10000" problem

MM- Prints the month in two digits

dd_ Prints the day in two digits followed by an underscore

hh- Prints the hour in two digits

mm- Prints the minute, also in two digits

ss- As expected, it prints the seconds

tt Prints AM or PM depending on the time of day

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

Had this same problem. Turned out mysqld had stopped running (I'm on Mac OSX). I restarted it and the error went away.

I figured out that mysqld was not running largely because of this link: http://dev.mysql.com/doc/refman/5.6/en/can-not-connect-to-server.html

Notice the first tip!

android splash screen sizes for ldpi,mdpi, hdpi, xhdpi displays ? - eg : 1024X768 pixels for ldpi

Splash screen sizes for Android

and at the same time for Cordova (a.k.a Phonegap), React-Native and all other development platforms

Format : 9-Patch PNG (recommended)

Dimensions

 - LDPI:
    - Portrait: 200x320px
    - Landscape: 320x200px
 - MDPI:
    - Portrait: 320x480px
    - Landscape: 480x320px
 - HDPI:
    - Portrait: 480x800px
    - Landscape: 800x480px
 - XHDPI:
    - Portrait: 720px1280px
    - Landscape: 1280x720px
 - XXHDPI
    - Portrait: 960x1600px
    - Landscape: 1600x960px
 - XXXHDPI 
    - Portrait: 1280x1920px
    - Landscape: 1920x1280px

Note: Preparing XXXHDPI is not needed and also maybe XXHDPI size too because of the repeating areas of 9-patch images. On the other hand, if only Portrait sizes are used the App size could be more less. More pictures mean more space is need.

Pay attention

I think there is no an exact size for the all devices. I use Xperia Z 5". If you develop a crossplatform-webview app you should consider a lot of things (whether screen has softkey navigation buttons or not, etc). Therefore, I think there is only one suitable solution. The solution is to prepare a 9-patch splash screen (find How to design a new splash screen heading below).

Create splash screens for the above screen sizes as 9-patch. Give names your files with .9.png suffixes
Add the lines below into your config.xml file
Add the splash screen plugin if it's needed.
Run your project.

That's it!

Cordova specific code
To be added lines into the config.xml for 9-patch splash screens

<preference name="SplashScreen" value="screen" />
<preference name="SplashScreenDelay" value="6000" />
<platform name="android">
    <splash src="res/screen/android/ldpi.9.png" density="ldpi"/>
    <splash src="res/screen/android/mdpi.9.png" density="mdpi"/>
    <splash src="res/screen/android/hdpi.9.png" density="hdpi"/>
    <splash src="res/screen/android/xhdpi.9.png" density="xhdpi"/> 
</platform>

To be added lines into the config.xml when using non-9-patch splash screens

<platform name="android">
    <splash src="res/screen/android/splash-land-hdpi.png" density="land-hdpi"/>
    <splash src="res/screen/android/splash-land-ldpi.png" density="land-ldpi"/>
    <splash src="res/screen/android/splash-land-mdpi.png" density="land-mdpi"/>
    <splash src="res/screen/android/splash-land-xhdpi.png" density="land-xhdpi"/>

    <splash src="res/screen/android/splash-port-hdpi.png" density="port-hdpi"/>
    <splash src="res/screen/android/splash-port-ldpi.png" density="port-ldpi"/>
    <splash src="res/screen/android/splash-port-mdpi.png" density="port-mdpi"/>
    <splash src="res/screen/android/splash-port-xhdpi.png" density="port-xhdpi"/>
</platform>

How to design a new splash screen

I would describe a simple way to create proper splash screen using this way. Assume we're designing a 1280dp x 720dp - xhdpi (x-large) screen. I've written for the sake of example the below;

In Photoshop: File -> New in new dialog window set your screens

Width: 720 Pixels Height: 1280 Pixels

I guess the above sizes mean Resolution is 320 Pixels/Inch. But to ensure you can change resolution value to 320 in your dialog window. In this case Pixels/Inch = DPI

Congratulations... You have a 720dp x 1280dp splash screen template.

How to generate a 9-patch splash screen

After you designed your splash screen, if you want to design 9-Patch splash screen, you should insert 1 pixel gap for every side. For this reason you should increase +2 pixel your canvas size's width and height ( now your image sizes are 722 x 1282 ).

I've left the blank 1 pixel gap at every side as directed the below.
Changing the canvas size by using Photoshop:
- Open a splash screen png file in Photoshop
- Click onto the lock icon next to the 'Background' name in the Layers field (to leave blank instead of another color like white) if there is like the below:

- Change the canvas size from Image menu ( Width: 720 pixels to 722 pixels and Height: 1280 pixels to 1282 pixels). Now, should see 1 pixel gap at every side of the splash screen image.

Then you can use C:\Program Files (x86)\Android\android-studio\sdk\tools\draw9patch.bat to convert a 9-patch file. For that open your splash screen on draw9patch app. You should define your logo and expandable areas. Notice the black line the following example splash screen. The black line's thickness is just 1 px ;) Left and Top sides black lines define your splash screen's must display area. Exactly as your designed. Right and Bottom lines define the addable and removable area (automatically repeating areas).

Just do that: Zoom your image's top edge on draw9patch application. Click and drag your mouse to draw line. And press shift + click and drag your mouse to erase line.

Sample 9-patch design

If you develop a cross-platform app (like Cordova/PhoneGap) you can find the following address almost all mabile OS splash screen sizes. Click for Windows Phone, WebOS, BlackBerry, Bada-WAC and Bada splash screen sizes.

https://github.com/phonegap/phonegap/wiki/App-Splash-Screen-Sizes

And if you need IOS, Android etc. app icon sizes you can visit here.

IOS

Format : PNG (recommended)

Dimensions

 - Tablet (iPad)
   - Non-Retina (1x)
     - Portrait: 768x1024px
     - Landscape: 1024x768px
   - Retina (2x)
     - Portrait: 1536x2048px
     - Landscape: 2048x1536px
 - Handheld (iPhone, iPod)
   - Non-Retina (1x)
     - Portrait: 320x480px
     - Landscape: 480x320px
   - Retina (2x)
     - Portrait: 640x960px
     - Landscape: 960x640px
 - iPhone 5 Retina (2x)
   - Portrait: 640x1136px
   - Landscape: 1136x640px
 - iPhone 6 (2x)
   - Portrait: 750x1334px
   - Landscape: 1334x750px
 - iPhone 6 Plus (3x)
   - Portrait: 1242x2208px
   - Landscape: 2208x1242px

How do I query using fields inside the new PostgreSQL JSON datatype?

Postgres 9.2

I quote Andrew Dunstan on the pgsql-hackers list:

At some stage there will possibly be some json-processing (as opposed to json-producing) functions, but not in 9.2.

Doesn't prevent him from providing an example implementation in PLV8 that should solve your problem.

Postgres 9.3

Offers an arsenal of new functions and operators to add "json-processing".

The manual on new JSON functionality.
The Postgres Wiki on new features in pg 9.3.
@Will posted a link to a blog demonstrating the new operators in a comments below.

The answer to the original question in Postgres 9.3:

SELECT *
FROM   json_array_elements(
  '[{"name": "Toby", "occupation": "Software Engineer"},
    {"name": "Zaphod", "occupation": "Galactic President"} ]'
  ) AS elem
WHERE elem->>'name' = 'Toby';

Advanced example:

Query combinations with nested array of records in JSON datatype

For bigger tables you may want to add an expression index to increase performance:

Index for finding an element in a JSON array

Postgres 9.4

Adds jsonb (b for "binary", values are stored as native Postgres types) and yet more functionality for both types. In addition to expression indexes mentioned above, jsonb also supports GIN, btree and hash indexes, GIN being the most potent of these.

The manual on json and jsonb data types and functions.
The Postgres Wiki on JSONB in pg 9.4

The manual goes as far as suggesting:

In general, most applications should prefer to store JSON data as jsonb, unless there are quite specialized needs, such as legacy assumptions about ordering of object keys.

Bold emphasis mine.

Performance benefits from general improvements to GIN indexes.

Postgres 9.5

Complete jsonb functions and operators. Add more functions to manipulate jsonb in place and for display.

Major good news in the release notes of Postgres 9.5.

PostgreSQL naming conventions

Regarding tables names, case, etc, the prevalent convention is:

SQL keywords: UPPER CASE
names (identifiers): lower_case_with_underscores

For example:

UPDATE my_table SET name = 5;

This is not written in stone, but the bit about identifiers in lower case is highly recommended, IMO. Postgresql treats identifiers case insensitively when not quoted (it actually folds them to lowercase internally), and case sensitively when quoted; many people are not aware of this idiosyncrasy. Using always lowercase you are safe. Anyway, it's acceptable to use camelCase or PascalCase (or UPPER_CASE), as long as you are consistent: either quote identifiers always or never (and this includes the schema creation!).

I am not aware of many more conventions or style guides. Surrogate keys are normally made from a sequence (usually with the serial macro), it would be convenient to stick to that naming for those sequences if you create them by hand (tablename_colname_seq).

See also some discussion here, here and (for general SQL) here, all with several related links.

Note: Postgresql 10 introduced identity columns as an SQL-compliant replacement for serial.

Calculate age given the birth date in the format YYYYMMDD

I think that could be simply like that:

function age(dateString){
    let birth = new Date(dateString);
    let now = new Date();
    let beforeBirth = ((() => {birth.setDate(now.getDate());birth.setMonth(now.getMonth()); return birth.getTime()})() < birth.getTime()) ? 0 : 1;
    return now.getFullYear() - birth.getFullYear() - beforeBirth;
}

age('09/20/1981');
//35

Works also with a timestamp

age(403501000000)
//34

Choose File Dialog

Adding to the mix: the OI File Manager has a public api registered at openintents.org

http://www.openintents.org/filemanager

http://www.openintents.org/action/org-openintents-action-pick-file/

Open-Source Examples of well-designed Android Applications?

Source Code for Remote for VLC - VLC Remote

Angular 2: Get Values of Multiple Checked Checkboxes

Here's a simple way using ngModel (final Angular 2)

<!-- my.component.html -->

<div class="form-group">
    <label for="options">Options:</label>
    <div *ngFor="let option of options">
        <label>
            <input type="checkbox"
                   name="options"
                   value="{{option.value}}"
                   [(ngModel)]="option.checked"/>
            {{option.name}}
        </label>
    </div>
</div>

// my.component.ts

@Component({ moduleId:module.id, templateUrl:'my.component.html'})

export class MyComponent {
  options = [
    {name:'OptionA', value:'1', checked:true},
    {name:'OptionB', value:'2', checked:false},
    {name:'OptionC', value:'3', checked:true}
  ]

  get selectedOptions() { // right now: ['1','3']
    return this.options
              .filter(opt => opt.checked)
              .map(opt => opt.value)
  }
}

Determining the current foreground application from a background task or service

I combined two solutions in one method and it works for me for API 24 and for API 21. Others I didn't test.

The code in Kotlin:

private fun isAppInForeground(context: Context): Boolean {
    val appProcessInfo = ActivityManager.RunningAppProcessInfo()
    ActivityManager.getMyMemoryState(appProcessInfo)
    if (appProcessInfo.importance == IMPORTANCE_FOREGROUND ||
            appProcessInfo.importance == IMPORTANCE_VISIBLE) {
        return true
    } else if (appProcessInfo.importance == IMPORTANCE_TOP_SLEEPING ||
            appProcessInfo.importance == IMPORTANCE_BACKGROUND) {
        return false
    }

    val am = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
    val foregroundTaskInfo = am.getRunningTasks(1)[0]
    val foregroundTaskPackageName = foregroundTaskInfo.topActivity.packageName
    return foregroundTaskPackageName.toLowerCase() == context.packageName.toLowerCase()
}

and in Manifest

<!-- Check whether app in background or foreground -->
<uses-permission android:name="android.permission.GET_TASKS" />

Python memory leaks

You should specially have a look on your global or static data (long living data).

When this data grows without restriction, you can also get troubles in Python.

The garbage collector can only collect data, that is not referenced any more. But your static data can hookup data elements that should be freed.

Another problem can be memory cycles, but at least in theory the Garbage collector should find and eliminate cycles -- at least as long as they are not hooked on some long living data.

What kinds of long living data are specially troublesome? Have a good look on any lists and dictionaries -- they can grow without any limit. In dictionaries you might even don't see the trouble coming since when you access dicts, the number of keys in the dictionary might not be of big visibility to you ...

Converting a Pandas GroupBy output from Series to DataFrame

The key is to use the reset_index() method.

Use:

import pandas

df1 = pandas.DataFrame( { 
    "Name" : ["Alice", "Bob", "Mallory", "Mallory", "Bob" , "Mallory"] , 
    "City" : ["Seattle", "Seattle", "Portland", "Seattle", "Seattle", "Portland"] } )

g1 = df1.groupby( [ "Name", "City"] ).count().reset_index()

Now you have your new dataframe in g1:

Bigger Glyphicons

If you are using bootstrap 3, use tag, like this <small><span class="glyphicon glyphicon-send"></span></small> It works perfect for Bootstrap 3.
You can even use multiple <small> tags to set the size more smaller.
Code:
<small><small><span class="glyphicon glyphicon-send"></span></small></small>

Temporary table in SQL server causing ' There is already an object named' error

In Azure Data warehouse also this occurs sometimes, because temporary tables created for a user session.. I got the same issue fixed by reconnecting the database,

JQuery Number Formatting

Putting this http://www.mredkj.com/javascript/numberFormat.html and $('.number').formatNumber(); concept together, you may use the following line of code;

e.g. <td class="number">1172907.50</td> will be formatted like <td class="number">1,172,907.50</td>

$('.number').text(function () { 
    var str = $(this).html() + ''; 
    x = str.split('.'); 
    x1 = x[0]; x2 = x.length > 1 ? '.' + x[1] : ''; 
    var rgx = /(\d+)(\d{3})/; 
    while (rgx.test(x1)) { 
        x1 = x1.replace(rgx, '$1' + ',' + '$2'); 
    } 
    $(this).html(x1 + x2); 
});

PHPMyAdmin Default login password

If it was installed with plesk (not sure if it's just that, or on the phpmyadmin side: It changes the root user to admin.

How to sort strings in JavaScript

var str = ['v','a','da','c','k','l']
var b = str.join('').split('').sort().reverse().join('')
console.log(b)

print highest value in dict with key

just :

 mydict = {'A':4,'B':10,'C':0,'D':87}
 max(mydict.items(), key=lambda x: x[1])

android - listview get item view by position

You can get only visible View from ListView because row views in ListView are reuseable. If you use mListView.getChildAt(0) you get first visible view. This view is associated with item from adapter at position mListView.getFirstVisiblePosition().

Is there a java setting for disabling certificate validation?

In addition to the answers above. You can do it programmatically by implementing the TrustManager:

TrustManager[] trustAllCerts = new TrustManager[] {
        new X509TrustManager() {
          public java.security.cert.X509Certificate[] getAcceptedIssuers() {
           return null;
          }
          @Override
          public void checkClientTrusted(X509Certificate[] arg0, String arg1)
           throws CertificateException {}

          @Override
          public void checkServerTrusted(X509Certificate[] arg0, String arg1)
            throws CertificateException {}
          }
     };

  SSLContext sc=null;
  try {
   sc = SSLContext.getInstance("SSL");
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  }
  try {
   sc.init(null, trustAllCerts, new java.security.SecureRandom());
  } catch (KeyManagementException e) {
   e.printStackTrace();
  }
  HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
  // Create all-trusting host name verifier
  HostnameVerifier validHosts = new HostnameVerifier() {
  @Override
  public boolean verify(String arg0, SSLSession arg1) {
   return true;
  }
  };
  // All hosts will be valid
  HttpsURLConnection.setDefaultHostnameVerifier(validHosts);

However this is not a good practice for production.

This example on How to disable SSL certificat validation in Java contains a utility class you can copy in your project.

Set Locale programmatically

Add a helper class with the following method:

public class LanguageHelper {
    public static final void setAppLocale(String language, Activity activity) {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            Resources resources = activity.getResources();
            Configuration configuration = resources.getConfiguration();
            configuration.setLocale(new Locale(language));
            activity.getApplicationContext().createConfigurationContext(configuration);
        } else {
            Locale locale = new Locale(language);
            Locale.setDefault(locale);
            Configuration config = activity.getResources().getConfiguration();
            config.locale = locale;
            activity.getResources().updateConfiguration(config,
                    activity.getResources().getDisplayMetrics());
        }

    }
}

And call it in your startup activity, like MainActivity.java:

public void onCreate(Bundle savedInstanceState) {
    ...
    LanguageHelper.setAppLocale("fa", this);
    ...
}

Oracle Add 1 hour in SQL

Use an interval:

select some_date_column + interval '1' hour 
from your_table;

Formatting Phone Numbers in PHP

Assuming that your phone numbers always have this exact format, you can use this snippet:

$from = "+11234567890";
$to = sprintf("%s-%s-%s",
              substr($from, 2, 3),
              substr($from, 5, 3),
              substr($from, 8));

How to read all files in a folder from Java?

import java.io.File;


public class ReadFilesFromFolder {
  public static File folder = new File("C:/Documents and Settings/My Documents/Downloads");
  static String temp = "";

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("Reading files under the folder "+ folder.getAbsolutePath());
    listFilesForFolder(folder);
  }

  public static void listFilesForFolder(final File folder) {

    for (final File fileEntry : folder.listFiles()) {
      if (fileEntry.isDirectory()) {
        // System.out.println("Reading files under the folder "+folder.getAbsolutePath());
        listFilesForFolder(fileEntry);
      } else {
        if (fileEntry.isFile()) {
          temp = fileEntry.getName();
          if ((temp.substring(temp.lastIndexOf('.') + 1, temp.length()).toLowerCase()).equals("txt"))
            System.out.println("File= " + folder.getAbsolutePath()+ "\\" + fileEntry.getName());
        }

      }
    }
  }
}

Git push error: "origin does not appear to be a git repository"

my case was a little different - unintentionally I have changed owner of git repository (project.git directory in my case), changing owner back to the git user helped

File uploading with Express 4.0: req.files undefined

1) Make sure that your file is really sent from the client side. For example you can check it in Chrome Console: screenshot

2) Here is the basic example of NodeJS backend:

const express = require('express');
const fileUpload = require('express-fileupload');
const app = express();

app.use(fileUpload()); // Don't forget this line!

app.post('/upload', function(req, res) {
   console.log(req.files);
   res.send('UPLOADED!!!');
});

How to send a compressed archive that contains executables so that Google's attachment filter won't reject it

Try this:

tar -czf my.tar.gz dir/

But are you sure you are not compressing some .exe file or something? Maybe the problem is not with te compression, but with the files you are compressing?

correct configuration for nginx to localhost?

Fundamentally you hadn't declare location which is what nginx uses to bind URL with resources.

 server {
            listen       80;
            server_name  localhost;

            access_log  logs/localhost.access.log  main;

            location / {
                root /var/www/board/public;
                index index.html index.htm index.php;
            }
       }

The difference between sys.stdout.write and print?

print is just a thin wrapper that formats the inputs (modifiable, but by default with a space between args and newline at the end) and calls the write function of a given object. By default this object is sys.stdout, but you can pass a file using the "chevron" form. For example:

print >> open('file.txt', 'w'), 'Hello', 'World', 2+3

See: https://docs.python.org/2/reference/simple_stmts.html?highlight=print#the-print-statement

In Python 3.x, print becomes a function, but it is still possible to pass something other than sys.stdout thanks to the fileargument.

print('Hello', 'World', 2+3, file=open('file.txt', 'w'))

See https://docs.python.org/3/library/functions.html#print

In Python 2.6+, print is still a statement, but it can be used as a function with

from __future__ import print_function

Update: Bakuriu commented to point out that there is a small difference between the print function and the print statement (and more generally between a function and a statement).

In case of an error when evaluating arguments:

print "something", 1/0, "other" #prints only something because 1/0 raise an Exception

print("something", 1/0, "other") #doesn't print anything. The function is not called

How to completely uninstall Visual Studio 2010?

Update April 2016 - for VS2013+

Microsoft started to address the issue in late 2015 by releasing VisualStudioUninstaller.

They abandoned the solution for a while; however work has begun again again as of April 2016.

There has finally been an official release for this uninstaller in April 2016 which is described as being "designed to cleanup/scorch all Preview/RC/RTM releases of Visual Studio 2013, Visual Studio 2015 and Visual Studio vNext".

Original Answer - for VS2010, VS2012

Note that the following two solutions still leave traces (such as registry files) and can't really be considered a 'clean' uninstall (see the final section of the answer for a completely clean solution).

Solution 1 - for: VS 2010

There's an uninstaller provided by Microsoft called the Visual Studio 2010 Uninstall Utility. It comes with three options:

Default (VS2010_Uninstall-RTM.ENU.exe)
Full (VS2010_Uninstall-RTM.ENU.exe /full)
Complete (VS2010_Uninstall-RTM.ENU.exe /full /netfx)

The above link explains the uninstaller in greater detail - I recommend reading the comments on the article before using it as some have noted problems (and workarounds) when service packs are installed. Afterwards, use something like CCleaner to remove the leftover registry files.

Here is the link to the download page of the VS2010 UU.

Solution 2 - for: VS 2010, VS 2012

Microsoft provide an uninstall /force feature that removes most remnants of either VS2010 or VS2012 from your computer.

MSDN: How to uninstall Visual Studio 2010/2012. From the link:

Warning: Running this command may remove some packages even if they are still in use like those listed in Optional shared packages.

Download the setup application you used to originally install Visual Studio 2012. If you installed from media, please insert that media.

Open a command prompt. Click Run on the Start menu (Start + R). Type cmd and press OK (Enter).

Type in the full path to the setup application and pass the following command line switches: /uninstall /force Example: D:\vs_ultimate.exe /uninstall /force

Click the Uninstall button and follow the prompts.

Afterwards, use something like CCleaner to remove the leftover registry files.

A completely clean uninstall?

Sadly, the only (current) way to achieve this is to follow dnLL's advice in their answer and perform a complete operating system reinstall. Then, in future, you could use Visual Studio inside a Virtual Machine instead and not have to worry about these issues again.

List comprehension vs map

map may be microscopically faster in some cases (when you're NOT making a lambda for the purpose, but using the same function in map and a listcomp). List comprehensions may be faster in other cases and most (not all) pythonistas consider them more direct and clearer.

An example of the tiny speed advantage of map when using exactly the same function:

$ python -mtimeit -s'xs=range(10)' 'map(hex, xs)'
100000 loops, best of 3: 4.86 usec per loop
$ python -mtimeit -s'xs=range(10)' '[hex(x) for x in xs]'
100000 loops, best of 3: 5.58 usec per loop

An example of how performance comparison gets completely reversed when map needs a lambda:

$ python -mtimeit -s'xs=range(10)' 'map(lambda x: x+2, xs)'
100000 loops, best of 3: 4.24 usec per loop
$ python -mtimeit -s'xs=range(10)' '[x+2 for x in xs]'
100000 loops, best of 3: 2.32 usec per loop

Get value from hashmap based on key to JSTL

could you please try below code

<c:forEach var="hash" items="${map['key']}">
        <option><c:out value="${hash}"/></option>
  </c:forEach>

How to check a string against null in java?

With Java 7 you can use

if (Objects.equals(foo, null)) {
    ...
}

which will return true if both parameters are null.

Certificate is trusted by PC but not by Android

I had the same error because I didn't issued a Let's Encrypt cert for the www.my-domain.com, only for my-domain.com

Issuing also for the www. and configuring the vhost to load certificates for www.my-domain.com before redirecting to https://my-domain.com did the trick.

WHERE IS NULL, IS NOT NULL or NO WHERE clause depending on SQL Server parameter value

Here is how you can solve this using a single WHERE clause:

WHERE (@myParm = value1 AND MyColumn IS NULL)
OR  (@myParm = value2 AND MyColumn IS NOT NULL)
OR  (@myParm = value3)

A naïve usage of the CASE statement does not work, by this I mean the following:

SELECT Field1, Field2 FROM MyTable
WHERE CASE @myParam
    WHEN value1 THEN MyColumn IS NULL
    WHEN value2 THEN MyColumn IS NOT NULL
    WHEN value3 THEN TRUE
END

It is possible to solve this using a case statement, see onedaywhen's answer

Chrome disable SSL checking for sites?

In my case I was developing an ASP.Net MVC5 web app and the certificate errors on my local dev machine (IISExpress certificate) started becoming a practical concern once I started working with service workers. Chrome simply wouldn't register my service worker because of the certificate error.

I did, however, notice that during my automated Selenium browser tests, Chrome seem to just "ignore" all these kinds of problems (e.g. the warning page about an insecure site), so I asked myself the question: How is Selenium starting Chrome for running its tests, and might it also solve the service worker problem?

Using Process Explorer on Windows, I was able to find out the command-line arguments with which Selenium is starting Chrome:

"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disable-background-networking --disable-client-side-phishing-detection --disable-default-apps --disable-hang-monitor --disable-popup-blocking --disable-prompt-on-repost --disable-sync --disable-web-resources --enable-automation --enable-logging --force-fieldtrials=SiteIsolationExtensions/Control --ignore-certificate-errors --log-level=0 --metrics-recording-only --no-first-run --password-store=basic --remote-debugging-port=12207 --safebrowsing-disable-auto-update --test-type=webdriver --use-mock-keychain --user-data-dir="C:\Users\Sam\AppData\Local\Temp\some-non-existent-directory" data:,

There are a bunch of parameters here that I didn't end up doing necessity-testing for, but if I run Chrome this way, my service worker registers and works as expected.

The only one that does seem to make a difference is the --user-data-dir parameter, which to make things work can be set to a non-existent directory (things won't work if you don't provide the parameter).

Hope that helps someone else with a similar problem. I'm using Chrome 60.0.3112.90.

Where to find 64 bit version of chromedriver.exe for Selenium WebDriver?

There is no separate chromedriver binary for Windows 64 bit. Chromedriver 32 bit binary works for both 32 as well as 64 bit versions of Windows. As of today, you can find the latest version of chromedriver Windows binary at https://chromedriver.storage.googleapis.com/2.25/chromedriver_win32.zip

Storyboard - refer to ViewController in AppDelegate

Have a look at the documentation for -[UIStoryboard instantiateViewControllerWithIdentifier:]. This allows you to instantiate a view controller from your storyboard using the identifier that you set in the IB Attributes Inspector:

enter image description here

EDITED to add example code:

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                         bundle: nil];

MyViewController *controller = (MyViewController*)[mainStoryboard 
                    instantiateViewControllerWithIdentifier: @"<Controller ID>"];

string in namespace std does not name a type

You need to add:

#include <string>

In your header file.

How do I get the calling method name and type using reflection?

You can use it by using the StackTrace and then you can get reflective types from that.

StackTrace stackTrace = new StackTrace();           // get call stack
StackFrame[] stackFrames = stackTrace.GetFrames();  // get method calls (frames)

StackFrame callingFrame = stackFrames[1];
MethodInfo method = callingFrame.GetMethod();
Console.Write(method.Name);
Console.Write(method.DeclaringType.Name);

How to insert logo with the title of a HTML page?

Yes you right and I just want to make it understandable for complete beginners.

Create favicon.ico file you want to be shown next to your url in browsers tab. You can do that online. I used http://www.prodraw.net/favicon/generator.php it worked juts fine.
Save generated ico file in your web site root directory /images (yourwebsite/images) under the name favicon.ico.
Copy this tag <link rel="shortcut icon" href="images/favicon.ico" /> and past it without any changes in between <head> opening and </head> closing tag.
Save changes in your html file and reload your browser.

CSS word-wrapping in div

Or simply use

word-wrap: break-word;

supported in IE 5.5+, Firefox 3.5+, and WebKit browsers such as Chrome and Safari.

"Uncaught TypeError: a.indexOf is not a function" error when opening new foundation project

I'm using jQuery 3.3.1 and I received the same error, in my case, the URL was an Object vs a string.

What happened was, that I took URL = window.location - which returned an object. Once I've changed it into window.location.href - it worked w/o the e.indexOf error.

How to increase Bootstrap Modal Width?

If you want to keep the modal responsive use % of width instead of pixels. You can do it in-line (see below) or with CSS.

<div class="modal fade" id="phpModal" role="dialog">
            <div class="modal-dialog modal-lg" style="width:80%;">
                <div class="modal-content">
                    <div class="modal-header">
                        <button type="button" class="close" data-dismiss="modal">&times;</button>
                        <h4 class="modal-title">HERE YOU TITLE</h4>
                    </div>
                    <div class="modal-body helpModal phpModal">
                        HERE YOUR CONTENT
                    </div>
                </div>
            </div>
        </div>

If you use CSS, you can even do different % for modal-sm and modal-lg.

Converting a date in MySQL from string field

SELECT STR_TO_DATE(dateString, '%d/%m/%y') FROM yourTable...

Where should I put <script> tags in HTML markup?

If you still care a lot about support and performance in IE<10, it's best to ALWAYS make your script tags the last tags of your HTML body. That way, you're certain that the rest of the DOM has been loaded and you won't block and rendering.
If you don't care too much anymore about IE<10, you might want to put your scripts in the head of your document and use defer to ensure they only run after your DOM has been loaded (<script type="text/javascript" src="path/to/script1.js" defer></script>). If you still want your code to work in IE<10, don't forget to wrap your code in a window.onload even, though!

Creating an empty bitmap and drawing though canvas in Android

Do not use Bitmap.Config.ARGB_8888

Instead use int w = WIDTH_PX, h = HEIGHT_PX;

Bitmap.Config conf = Bitmap.Config.ARGB_4444; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);

// ready to draw on that bitmap through that canvas

ARGB_8888 can land you in OutOfMemory issues when dealing with more bitmaps or large bitmaps. Or better yet, try avoiding usage of ARGB option itself.

How to use the PRINT statement to track execution as stored procedure is running?

I'm sure you can use RAISERROR ... WITH NOWAIT

If you use severity 10 it's not an error. This also provides some handy formatting eg %s, %i and you can use state too to track where you are.

laravel collection to array

Use collect($comments_collection).

Else, try json_encode($comments_collection) to convert to json.

How do I make a redirect in PHP?

1. Using header, a built-in PHP function

a) Simple redirect without parameters

<?php
   header('Location: index.php');
?>

b) Redirect with GET parameters

<?php
      $id = 2;
      header("Location: index.php?id=$id&msg=succesfully redirect");
  ?>

2. Redirect with JavaScript in PHP

a) Simple redirect without parameters

<?php
     echo "<script>location.href='index.php';</script>";
 ?>

b) Redirect with GET parameters

<?php
     $id = 2;
     echo "<script>location.href='index.php?id=$id&msg=succesfully redirect';</script>";
   ?>

Utility of HTTP header "Content-Type: application/force-download" for mobile?

Content-Type: application/force-download means "I, the web server, am going to lie to you (the browser) about what this file is so that you will not treat it as a PDF/Word Document/MP3/whatever and prompt the user to save the mysterious file to disk instead". It is a dirty hack that breaks horribly when the client doesn't do "save to disk".

Use the correct mime type for whatever media you are using (e.g. audio/mpeg for mp3).

Use the Content-Disposition: attachment; etc etc header if you want to encourage the client to download it instead of following the default behaviour.

How can I check if a string is null or empty in PowerShell?

Personally, I do not accept a whitespace ($STR3) as being 'not empty'.

When a variable that only contains whitespaces is passed onto a parameter, it will often error that the parameters value may not be '$null', instead of saying it may not be a whitespace, some remove commands might remove a root folder instead of a subfolder if the subfolder name is a "white space", all the reason not to accept a string containing whitespaces in many cases.

I find this is the best way to accomplish it:

$STR1 = $null
IF ([string]::IsNullOrWhitespace($STR1)){'empty'} else {'not empty'}

Empty

$STR2 = ""
IF ([string]::IsNullOrWhitespace($STR2)){'empty'} else {'not empty'}

Empty

$STR3 = " "
IF ([string]::IsNullOrWhitespace($STR3)){'empty !! :-)'} else {'not Empty :-('}

Empty!! :-)

$STR4 = "Nico"
IF ([string]::IsNullOrWhitespace($STR4)){'empty'} else {'not empty'}

Not empty

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

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

Ordering by specific field value first

This works for me using Postgres 9+:

SELECT *
FROM your_table
ORDER BY name = 'core' DESC, priority DESC

Does calling clone() on an array also clone its contents?

The clone is a shallow copy of the array.

This test code prints:

[1, 2] / [1, 2]
[100, 200] / [100, 2]

because the MutableInteger is shared in both arrays as objects[0] and objects2[0], but you can change the reference objects[1] independently from objects2[1].

import java.util.Arrays;                                                                                                                                 

public class CloneTest {                                                                                                                                 
    static class MutableInteger {                                                                                                                        
        int value;                                                                                                                                       
        MutableInteger(int value) {                                                                                                                      
            this.value = value;                                                                                                                          
        }                                                                                                                                                
        @Override                                                                                                                                        
        public String toString() {                                                                                                                       
            return Integer.toString(value);                                                                                                              
        }                                                                                                                                                
    }                                                                                                                                                    
    public static void main(String[] args) {                                                                                                             
        MutableInteger[] objects = new MutableInteger[] {
                new MutableInteger(1), new MutableInteger(2) };                                                
        MutableInteger[] objects2 = objects.clone();                                                                                                     
        System.out.println(Arrays.toString(objects) + " / " + 
                            Arrays.toString(objects2));                                                                
        objects[0].value = 100;                                                                                                                          
        objects[1] = new MutableInteger(200);                                                                                                            
        System.out.println(Arrays.toString(objects) + " / " + 
                            Arrays.toString(objects2));                                                               
    }                                                                                                                                                    
}

Using Python String Formatting with Lists

print s % tuple(x)

instead of

print s % (x)

Running an outside program (executable) in Python?

The simplest way is:

import os
os.startfile("C:\Documents and Settings\flow_model\flow.exe")

It works; I tried it.

Dilemma: when to use Fragments vs Activities:

You are free to use one of those.
Basically, you have to evaluate which is the best one to your app. Think about how you will manage the business flow and how to store/manage data preferences.

Think about, how Fragments store garbage data. When you implement the fragment, you have a activity root to fill with fragment(s). So, if your trying to implement a lot of activities with too much fragments, you have to consider performance on your app, coz you're manipulating (coarsely speaks) two context lifecycle, remember the complexity.

Remember: should I use fragments? Why shouldn't I?

regards.

Why are #ifndef and #define used in C++ header files?

#ifndef <token>
/* code */
#else
/* code to include if the token is defined */
#endif

#ifndef checks whether the given token has been #defined earlier in the file or in an included file; if not, it includes the code between it and the closing #else or, if no #else is present, #endif statement. #ifndef is often used to make header files idempotent by defining a token once the file has been included and checking that the token was not set at the top of that file.

#ifndef _INCL_GUARD
#define _INCL_GUARD
#endif

Failed to execute 'createObjectURL' on 'URL':

This error is caused because the function createObjectURL is deprecated for Google Chrome

I changed this:

video.src=vendorUrl.createObjectURL(stream);
video.play();

to this:

video.srcObject=stream;
video.play();

This worked for me.

How stable is the git plugin for eclipse?

Github blog spoke yesterday about Egit plugin:

http://freshmeat.net/projects/jgit/

curl posting with header application/x-www-form-urlencoded

<?php
//
// A very simple PHP example that sends a HTTP POST to a remote site
//

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,"http://xxxxxxxx.xxx/xx/xx");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
            "dispnumber=567567567&extension=6");
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));


// receive server response ...
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$server_output = curl_exec ($ch);

curl_close ($ch);

// further processing ....
if ($server_output == "OK") { ... } else { ... }

?>

Skip a submodule during a Maven build

The notion of multi-module projects is there to service the needs of codependent segments of a project. Such a client depends on the services which in turn depends on say EJBs or data-access routines. You could group your continuous integration (CI) tests in this manner. I would rationalize that by saying that the CI tests need to be in lock-step with application logic changes.

Suppose your project is structured as:

project-root
  |
  + --- ci
  |
  + --- client
  |
  + --- server

The project-root/pom.xml defines modules

<modules>
  <module>ci</module>
  <module>client</module>
  <module>server</module>
</modules>

The ci/pom.xml defines profiles such as:

... 
<profiles>
  <profile>
    <id>default</id>
    <activation>
      <activeByDefault>true</activeByDefault>
    </activation>
    <plugin>
       <artifactId>maven-surefire-plugin</artifactId>
       <configuration>
         <skip>true</skip>
       </configuration>
     </plugin>
  </profile>
  <profile>
    <id>CI</id>
    <plugin>
       <artifactId>maven-surefire-plugin</artifactId>
       <configuration>
         <skip>false</skip>
       </configuration>
     </plugin>
  </profile>
</profiles>

This will result in Maven skipping tests in this module except when the profile named CI is active. Your CI server must be instructed to execute mvn clean package -P CI. The Maven web site has an in-depth explanation of the profiling mechanism.

How to generate a random alpha-numeric string

I don't really like any of these answers regarding a "simple" solution :S

I would go for a simple ;), pure Java, one liner (entropy is based on random string length and the given character set):

public String randomString(int length, String characterSet) {
    return IntStream.range(0, length).map(i -> new SecureRandom().nextInt(characterSet.length())).mapToObj(randomInt -> characterSet.substring(randomInt, randomInt + 1)).collect(Collectors.joining());
}

@Test
public void buildFiveRandomStrings() {
    for (int q = 0; q < 5; q++) {
        System.out.println(randomString(10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")); // The character set can basically be anything
    }
}

Or (a bit more readable old way)

public String randomString(int length, String characterSet) {
    StringBuilder sb = new StringBuilder(); // Consider using StringBuffer if needed
    for (int i = 0; i < length; i++) {
        int randomInt = new SecureRandom().nextInt(characterSet.length());
        sb.append(characterSet.substring(randomInt, randomInt + 1));
    }
    return sb.toString();
}

@Test
public void buildFiveRandomStrings() {
    for (int q = 0; q < 5; q++) {
        System.out.println(randomString(10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")); // The character set can basically be anything
    }
}

But on the other hand you could also go with UUID which has a pretty good entropy:

UUID.randomUUID().toString().replace("-", "")

.gitignore is ignored by Git

My issue was (as OP suggested) a corrupt .gitignore file. I didn't believe that it was and ignored the possibility until everything else failed. The corruption didn't show up in vi, but there were two bytes on the start of the file that caused the .gitignore file to be ignored. For me, these only showed up when I typed cat .gitignore, which showed:

??# Built application files
*.apk
*.ap_

# ...

I have no idea how these ended up there, but recreating the file fixed the issue. A hex analysis of the corrupt file showed the following:

user@dev ~/project/myproject $ xxd -b .gitignore
00000000: 11111111 11111110 00100011 00000000 00100000 00000000  ..#. .
00000006: 01000010 00000000 01110101 00000000 01101001 00000000  B.u.i.

How to check the first character in a string in Bash or UNIX shell?

$ foo="/some/directory/file"
$ [ ${foo:0:1} == "/" ] && echo 1 || echo 0
1
$ foo="[email protected]:/some/directory/file"
$ [ ${foo:0:1} == "/" ] && echo 1 || echo 0
0

Android get Current UTC time

System.currentTimeMillis() does give you the number of milliseconds since January 1, 1970 00:00:00 UTC. The reason you see local times might be because you convert a Date instance to a string before using it. You can use DateFormats to convert Dates to Strings in any timezone:

DateFormat df = DateFormat.getTimeInstance();
df.setTimeZone(TimeZone.getTimeZone("gmt"));
String gmtTime = df.format(new Date());

Also see this related question.

How to check whether a select box is empty using JQuery/Javascript

One correct way to get selected value would be

var selected_value = $('#fruit_name').val()

And then you should do

if(selected_value) { ... }

Angular2 dynamic change CSS property

You don't have any example code but I assume you want to do something like this?

@View({
directives: [NgClass],
styles: [`
    .${TodoModel.COMPLETED}  {
        text-decoration: line-through;
    }
    .${TodoModel.STARTED} {
        color: green;
    }
`],
template: `<div>
                <span [ng-class]="todo.status" >{{todo.title}}</span>
                <button (click)="todo.toggle()" >Toggle status</button>
            </div>`
})

You assign ng-class to a variable which is dynamic (a property of a model called TodoModel as you can guess).

todo.toggle() is changing the value of todo.status and there for the class of the input is changing.

This is an example for class name but actually you could do the same think for css properties.

I hope this is what you meant.

This example is taken for the great egghead tutorial here.

onclick="javascript:history.go(-1)" not working in Chrome

Try this dude,

<button onclick="goBack()">Go Back 2 Pages</button>
<script>
  function goBack() {
    window.history.go(-2);
  }
</script>

How to search for occurrences of more than one space between words in a line

Here is my solution

[^0-9A-Z,\n]

This will remove all the digits, commas and new lines but select the middle space such as data set of

20171106,16632 ESCG0000018SB
20171107,280 ESCG0000018SB
20171106,70476 ESCG0000018SB

What tool can decompile a DLL into C++ source code?

I think a C++ DLL is a machine code file. Therefore decompiling will only result in assembler code. If you can read that and create C++ from that you're good to go.

TextView Marquee not working

android:focusable="true" and android:focusableInTouchMode="true" are essential....

Because I tested all others without these lines and the result was no marquee. When I add these it started to marquee..

How to get current class name including package name in Java?

use this.getClass().getName() to get packageName.className and use this.getClass().getSimpleName() to get only class name

Getting first and last day of the current month

string firstdayofyear = new DateTime(DateTime.Now.Year, 1, 1).ToString("MM-dd-yyyy");
string lastdayofyear = new DateTime(DateTime.Now.Year, 12, 31).ToString("MM-dd-yyyy");
string firstdayofmonth = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).ToString("MM-dd-yyyy");
string lastdayofmonth = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1).AddMonths(1).AddDays(-1).ToString("MM-dd-yyyy");

Best practices when running Node.js with port 80 (Ubuntu / Linode)

Give Safe User Permission To Use Port 80

Remember, we do NOT want to run your applications as the root user, but there is a hitch: your safe user does not have permission to use the default HTTP port (80). You goal is to be able to publish a website that visitors can use by navigating to an easy to use URL like http://ip:port/

Unfortunately, unless you sign on as root, you’ll normally have to use a URL like http://ip:port - where port number > 1024.

A lot of people get stuck here, but the solution is easy. There a few options but this is the one I like. Type the following commands:

sudo apt-get install libcap2-bin
sudo setcap cap_net_bind_service=+ep `readlink -f \`which node\``

Now, when you tell a Node application that you want it to run on port 80, it will not complain.

Check this reference link

How are "mvn clean package" and "mvn clean install" different?

package will add packaged jar or war to your target folder, We can check it when, we empty the target folder (using mvn clean) and then run mvn package.
install will do all the things that package does, additionally it will add packaged jar or war in local repository as well. We can confirm it by checking in your .m2 folder.

HTTP POST Returns Error: 417 "Expectation Failed."

Another way -

Add these lines to your application config file configuration section:

<system.net>
    <settings>
        <servicePointManager expect100Continue="false" />
    </settings>
</system.net>

Javascript seconds to minutes and seconds

The Following function will help you to get Days , Hours , Minutes , seconds

toDDHHMMSS(inputSeconds){
        const Days = Math.floor( inputSeconds / (60 * 60 * 24) );
        const Hour = Math.floor((inputSeconds % (60 * 60 * 24)) / (60 * 60));
        const Minutes = Math.floor(((inputSeconds % (60 * 60 * 24)) % (60 * 60)) / 60 );
        const Seconds = Math.floor(((inputSeconds % (60 * 60 * 24)) % (60 * 60)) % 60 );
        let ddhhmmss  = '';
        if (Days > 0){
            ddhhmmss += Days + ' Day ';
        }
        if (Hour > 0){
            ddhhmmss += Hour + ' Hour ';
        }

        if (Minutes > 0){
            ddhhmmss += Minutes + ' Minutes ';
        }

        if (Seconds > 0){
            ddhhmmss += Seconds + ' Seconds ';
        }
        return ddhhmmss;
    }
alert( toDDHHMMSS(2000));

Switch php versions on commandline ubuntu 16.04

You can use the below script to switch between PHP version easily I have included phpize configuration too.

https://github.com/anilkumararumulla/switch-php-version

Download the script file and run

sh switch.sh

Find number of decimal places in decimal value regardless of culture

And here's another way, use the type SqlDecimal which has a scale property with the count of the digits right of the decimal. Cast your decimal value to SqlDecimal and then access Scale.

((SqlDecimal)(decimal)yourValue).Scale

How to enable copy paste from between host machine and virtual machine in vmware, virtual machine is ubuntu

Here is a small hint that I hope might be useful to other poor saps that experienced the same issue as I did.

My Setup: Host: Windows 7 Enterprise - build 7601 SP 1 VM: VMware® Workstation 12 Player 12.1.1 build-3770994 (free) Guest: Fedora release 23

I naively failed to install open-vm-tools-desktop. I say naively because I had no idea such a thing existed, nor do I understand why instructions to install open-vm-tools do not (or at least where I read them, do not) include mentions of this package.

Installing open-vm-tools on its own appears to be nearly useless - the desktop package makes the copy and paste function - probably the single most important function of VMTools - work.

So, there you go. Install open-vm-tools-desktop, and copy-paste should work

How to convert an array into an object using stdClass()

One of the easiest solution is

$objectData = (object) $arrayData

toBe(true) vs toBeTruthy() vs toBeTrue()

What I do when I wonder something like the question asked here is go to the source.

toBe()

expect().toBe() is defined as:

function toBe() {
  return {
    compare: function(actual, expected) {
      return {
        pass: actual === expected
      };
    }
  };
}

It performs its test with === which means that when used as expect(foo).toBe(true), it will pass only if foo actually has the value true. Truthy values won't make the test pass.

toBeTruthy()

expect().toBeTruthy() is defined as:

function toBeTruthy() {
  return {
    compare: function(actual) {
      return {
        pass: !!actual
      };
    }
  };
}

Type coercion

A value is truthy if the coercion of this value to a boolean yields the value true. The operation !! tests for truthiness by coercing the value passed to expect to a boolean. Note that contrarily to what the currently accepted answer implies, == true is not a correct test for truthiness. You'll get funny things like

> "hello" == true
false
> "" == true
false
> [] == true
false
> [1, 2, 3] == true
false

Whereas using !! yields:

> !!"hello"
true
> !!""
false
> !![1, 2, 3]
true
> !![] 
true

(Yes, empty or not, an array is truthy.)

toBeTrue()

expect().toBeTrue() is part of Jasmine-Matchers (which is registered on npm as jasmine-expect after a later project registered jasmine-matchers first).

expect().toBeTrue() is defined as:

function toBeTrue(actual) {
  return actual === true ||
    is(actual, 'Boolean') &&
    actual.valueOf();
}

The difference with expect().toBeTrue() and expect().toBe(true) is that expect().toBeTrue() tests whether it is dealing with a Boolean object. expect(new Boolean(true)).toBe(true) would fail whereas expect(new Boolean(true)).toBeTrue() would pass. This is because of this funny thing:

> new Boolean(true) === true
false
> new Boolean(true) === false
false

At least it is truthy:

> !!new Boolean(true)
true

Which is best suited for use with `elem.isDisplayed()`?

Ultimately Protractor hands off this request to Selenium. The documentation states that the value produced by .isDisplayed() is a promise that resolves to a boolean. I would take it at face value and use .toBeTrue() or .toBe(true). If I found a case where the implementation returns truthy/falsy values, I would file a bug report.

How to reverse a 'rails generate'

It's worth mentioning the -p flag here ("p" for pretend).

If you add this to the command it will simply do a "test" run and show you what files will be deleted without actually deleting them.

$ rails d controller welcome -p

  remove  app/controllers/welcome_controller.rb
  invoke  erb
  remove    app/views/welcome
  invoke  test_unit
  remove    test/controllers/welcome_controller_test.rb
  invoke  helper
  remove    app/helpers/welcome_helper.rb
  invoke    test_unit
  remove      test/helpers/welcome_helper_test.rb
  invoke  assets
  invoke    coffee
  remove      app/assets/javascripts/welcome.js.coffee
  invoke    scss
  remove      app/assets/stylesheets/welcome.css.scss

If you're happy with it, run the command again without the -p flag.

android.content.res.Resources$NotFoundException: String resource ID #0x0

You can do it. this is a easy way.

txtTopicNo.setText(10+"");

Query to convert from datetime to date mysql

syntax of date_format:

SELECT date_format(date_born, '%m/%d/%Y' ) as my_date FROM date_tbl

    '%W %D %M %Y %T'    -> Wednesday 5th May 2004 23:56:25
    '%a %b %e %Y %H:%i' -> Wed May 5 2004 23:56
    '%m/%d/%Y %T'       -> 05/05/2004 23:56:25
    '%d/%m/%Y'          -> 05/05/2004
    '%m-%d-%y'          -> 04-08-13

How would you implement an LRU cache in Java?

Have a look at ConcurrentSkipListMap. It should give you log(n) time for testing and removing an element if it is already contained in the cache, and constant time for re-adding it.

You'd just need some counter etc and wrapper element to force ordering of the LRU order and ensure recent stuff is discarded when the cache is full.

PHP cURL vs file_get_contents

In addition to this, due to some recent website hacks we had to secure our sites more. In doing so, we discovered that file_get_contents failed to work, where curl still would work.

Not 100%, but I believe that this php.ini setting may have been blocking the file_get_contents request.

; Disable allow_url_fopen for security reasons
allow_url_fopen = 0

Either way, our code now works with curl.

How to change the current URL in javascript?

This is more robust:

mi = location.href.split(/(\d+)/);
no = mi.length - 2;
os = mi[no];
mi[no]++;
if ((mi[no] + '').length < os.length) mi[no] = os.match(/0+/) + mi[no];
location.href = mi.join('');

When the URL has multiple numbers, it will change the last one:

http://mywebsite.com/8815/1.html

It supports numbers with leading zeros:

http://mywebsite.com/0001.html

Example

What is EOF in the C programming language?

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

Edit:

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

Python module for converting PDF to text

The PDFMiner package has changed since codeape posted.

EDIT (again):

PDFMiner has been updated again in version 20100213

You can check the version you have installed with the following:

>>> import pdfminer
>>> pdfminer.__version__
'20100213'

Here's the updated version (with comments on what I changed/added):

def pdf_to_csv(filename):
    from cStringIO import StringIO  #<-- added so you can copy/paste this to try it
    from pdfminer.converter import LTTextItem, TextConverter
    from pdfminer.pdfparser import PDFDocument, PDFParser
    from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter

    class CsvConverter(TextConverter):
        def __init__(self, *args, **kwargs):
            TextConverter.__init__(self, *args, **kwargs)

        def end_page(self, i):
            from collections import defaultdict
            lines = defaultdict(lambda : {})
            for child in self.cur_item.objs:
                if isinstance(child, LTTextItem):
                    (_,_,x,y) = child.bbox                   #<-- changed
                    line = lines[int(-y)]
                    line[x] = child.text.encode(self.codec)  #<-- changed

            for y in sorted(lines.keys()):
                line = lines[y]
                self.outfp.write(";".join(line[x] for x in sorted(line.keys())))
                self.outfp.write("\n")

    # ... the following part of the code is a remix of the 
    # convert() function in the pdfminer/tools/pdf2text module
    rsrc = PDFResourceManager()
    outfp = StringIO()
    device = CsvConverter(rsrc, outfp, codec="utf-8")  #<-- changed 
        # becuase my test documents are utf-8 (note: utf-8 is the default codec)

    doc = PDFDocument()
    fp = open(filename, 'rb')
    parser = PDFParser(fp)       #<-- changed
    parser.set_document(doc)     #<-- added
    doc.set_parser(parser)       #<-- added
    doc.initialize('')

    interpreter = PDFPageInterpreter(rsrc, device)

    for i, page in enumerate(doc.get_pages()):
        outfp.write("START PAGE %d\n" % i)
        interpreter.process_page(page)
        outfp.write("END PAGE %d\n" % i)

    device.close()
    fp.close()

    return outfp.getvalue()

Edit (yet again):

Here is an update for the latest version in pypi, 20100619p1. In short I replaced LTTextItem with LTChar and passed an instance of LAParams to the CsvConverter constructor.

def pdf_to_csv(filename):
    from cStringIO import StringIO  
    from pdfminer.converter import LTChar, TextConverter    #<-- changed
    from pdfminer.layout import LAParams
    from pdfminer.pdfparser import PDFDocument, PDFParser
    from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter

    class CsvConverter(TextConverter):
        def __init__(self, *args, **kwargs):
            TextConverter.__init__(self, *args, **kwargs)

        def end_page(self, i):
            from collections import defaultdict
            lines = defaultdict(lambda : {})
            for child in self.cur_item.objs:
                if isinstance(child, LTChar):               #<-- changed
                    (_,_,x,y) = child.bbox                   
                    line = lines[int(-y)]
                    line[x] = child.text.encode(self.codec)

            for y in sorted(lines.keys()):
                line = lines[y]
                self.outfp.write(";".join(line[x] for x in sorted(line.keys())))
                self.outfp.write("\n")

    # ... the following part of the code is a remix of the 
    # convert() function in the pdfminer/tools/pdf2text module
    rsrc = PDFResourceManager()
    outfp = StringIO()
    device = CsvConverter(rsrc, outfp, codec="utf-8", laparams=LAParams())  #<-- changed
        # becuase my test documents are utf-8 (note: utf-8 is the default codec)

    doc = PDFDocument()
    fp = open(filename, 'rb')
    parser = PDFParser(fp)       
    parser.set_document(doc)     
    doc.set_parser(parser)       
    doc.initialize('')

    interpreter = PDFPageInterpreter(rsrc, device)

    for i, page in enumerate(doc.get_pages()):
        outfp.write("START PAGE %d\n" % i)
        if page is not None:
            interpreter.process_page(page)
        outfp.write("END PAGE %d\n" % i)

    device.close()
    fp.close()

    return outfp.getvalue()

EDIT (one more time):

Updated for version 20110515 (thanks to Oeufcoque Penteano!):

def pdf_to_csv(filename):
    from cStringIO import StringIO  
    from pdfminer.converter import LTChar, TextConverter
    from pdfminer.layout import LAParams
    from pdfminer.pdfparser import PDFDocument, PDFParser
    from pdfminer.pdfinterp import PDFResourceManager, PDFPageInterpreter

    class CsvConverter(TextConverter):
        def __init__(self, *args, **kwargs):
            TextConverter.__init__(self, *args, **kwargs)

        def end_page(self, i):
            from collections import defaultdict
            lines = defaultdict(lambda : {})
            for child in self.cur_item._objs:                #<-- changed
                if isinstance(child, LTChar):
                    (_,_,x,y) = child.bbox                   
                    line = lines[int(-y)]
                    line[x] = child._text.encode(self.codec) #<-- changed

            for y in sorted(lines.keys()):
                line = lines[y]
                self.outfp.write(";".join(line[x] for x in sorted(line.keys())))
                self.outfp.write("\n")

    # ... the following part of the code is a remix of the 
    # convert() function in the pdfminer/tools/pdf2text module
    rsrc = PDFResourceManager()
    outfp = StringIO()
    device = CsvConverter(rsrc, outfp, codec="utf-8", laparams=LAParams())
        # becuase my test documents are utf-8 (note: utf-8 is the default codec)

    doc = PDFDocument()
    fp = open(filename, 'rb')
    parser = PDFParser(fp)       
    parser.set_document(doc)     
    doc.set_parser(parser)       
    doc.initialize('')

    interpreter = PDFPageInterpreter(rsrc, device)

    for i, page in enumerate(doc.get_pages()):
        outfp.write("START PAGE %d\n" % i)
        if page is not None:
            interpreter.process_page(page)
        outfp.write("END PAGE %d\n" % i)

    device.close()
    fp.close()

    return outfp.getvalue()

X-UA-Compatible is set to IE=edge, but it still doesn't stop Compatibility Mode

For Nginx,

add_header "X-UA-Compatible" "IE=Edge,chrome=1";

ref : https://github.com/h5bp/server-configs/commit/a5b0a8f736d68f7de27cdcb202e32975a74bd2c5

Return Type for jdbcTemplate.queryForList(sql, object, classType)

queryForList returns a List of LinkedHashMap objects.

You need to cast it first like this:


    List list = jdbcTemplate.queryForList(...);
    for (Object o : list) {
       Map m = (Map) o;
       ...
    }

Adjust width of input field to its input

Based off Michael's answer, I have created my own version of this using jQuery. I think it is a cleaner/shorter version of most answers here and it seems to get the job done.

I am doing the same thing as most of the people here by using a span to write the input text into then getting the width. Then I am setting the width when the actions keyup and blur are called.

Here is a working codepen. This codepen shows how this can be used with multiple input fields.

HTML Structure:

<input type="text" class="plain-field" placeholder="Full Name">
<span style="display: none;"></span>

jQuery:

function resizeInputs($text) {
    var text = $text.val().replace(/\s+/g, ' '),
        placeholder = $text.attr('placeholder'),
        span = $text.next('span');
        span.text(placeholder);
    var width = span.width();

    if(text !== '') {
        span.text(text);
    var width = span.width();
    }

    $text.css('width', width + 5);
};

The function above gets the inputs value, trims the extra spaces and sets the text into the span to get the width. If there is no text, it instead gets the placeholder and enters that into the span instead. Once it enters the text into the span it then sets the width of the input. The + 5 on the width is because without that the input gets cut off a tiny bit in the Edge Browser.

$('.plain-field').each(function() {
    var $text = $(this);
    resizeInputs($text);
});

$('.plain-field').on('keyup blur', function() {
    var $text = $(this);
    resizeInputs($text);
});

$('.plain-field').on('blur', function() {
    var $text = $(this).val().replace(/\s+/g, ' ');
    $(this).val($text);
});

If this could be improved please let me know as this is the cleanest solution I could come up with.

Java Class that implements Map and keeps insertion order?

You can maintain a Map (for fast lookup) and List (for order) but a LinkedHashMap may be the simplest. You can also try a SortedMap e.g. TreeMap, which an have any order you specify.

Use of for_each on map elements

From what I remembered, C++ map can return you an iterator of keys using map.begin(), you can use that iterator to loop over all the keys until it reach map.end(), and get the corresponding value: C++ map

Programs & Examples On #Static polymorphism

Negative matching using grep (match lines that do not contain foo)

how to check if input field is empty

Get root password for Google Cloud Engine VM

ModalPopupExtender OK Button click event not firing?

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

Correct way to use Modernizr to detect IE?

Displaying files (e.g. images) stored in Google Drive on a website

SQL Call Stored Procedure for each Row without using a cursor

ASP.Net 2012 Unobtrusive Validation with jQuery

Open button in new window?

Android Pop-up message

Reading from memory stream to string

What's an easy way to read random line from a file in Unix command line?

Is there a way to specify how many characters of a string to print out using printf()?

Using jQuery UI sortable with HTML tables

How to SELECT WHERE NOT EXIST using LINQ?

How to read and write into file using JavaScript?

Example to use shared_ptr?

Get response from PHP file using AJAX

boolean in an if statement

How does one capture a Mac's command key via JavaScript?

Facebook API "This app is in development mode"

web-api POST body object always null

Javascript Get Values from Multiple Select Option Box

how to check for special characters php

How to Solve the XAMPP 1.7.7 - PHPMyAdmin - MySQL Error #2002 in Ubuntu

Is there a pretty print for PHP?

How to create a fixed sidebar layout with Bootstrap 4?

How do you change the value inside of a textfield flutter?

Create array of regex matches

VBA check if object is set

Logical operator in a handlebars.js {{#if}} conditional

Not able to change TextField Border Color

C++ callback using class member

Handle Guzzle exception and get HTTP body

How can I start an Activity from a non-Activity class?

How to append elements at the end of ArrayList in Java?

Execution Failed for task :app:compileDebugJavaWithJavac in Android Studio

c# how to add byte to byte array

web.xml is missing and <failOnMissingWebXml> is set to true

How to check if a "lateinit" variable has been initialized?

cast class into another class or convert class to another

What is the method for converting radians to degrees?

C# version of java's synchronized keyword?

Why is semicolon allowed in this python snippet?

Chrome & Safari Error::Not allowed to load local resource: file:///D:/CSS/Style.css

How to format strings using printf() to get equal length in the output

Making an image act like a button

Remove the last three characters from a string

Sass nth-child nesting

How to use onClick() or onSelect() on option tag in a JSP page?

"cannot resolve symbol R" in Android Studio

How to define two fields "unique" as couple

Where is my m2 folder on Mac OS X Mavericks

Setting new value for an attribute using jQuery

Automatically run %matplotlib inline in IPython Notebook

npm ERR! registry error parsing json - While trying to install Cordova for Ionic Framework in Windows 8

How to replace an entire line in a text file by line number

Javascript set img src

PHP Email sending BCC

How to prevent scrollbar from repositioning web page?

How to make a class property?

Loaded nib but the 'view' outlet was not set

Is a view faster than a simple query?

Pad a number with leading zeros in JavaScript

Convert a Python list with strings all to lowercase or uppercase

How to embed a PDF?

Create Table from View

Converting a sentence string to a string array of words in Java

In Powershell what is the idiomatic way of converting a string to an int?

How do I register a DLL file on Windows 7 64-bit?

Spring Boot access static resources missing scr/main/resources

Best way to get value from Collection by index

Detect IF hovering over element with jQuery

bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

C# - Insert a variable number of spaces into a string? (Formatting an output file)

Hiding elements in responsive layout?

Netbeans - Error: Could not find or load main class

JavaScript: Alert.Show(message) From ASP.NET Code-behind