#Column oriented | Programs & Examples on Column oriented

How to Lock the data in a cell in excel using vba

You can first choose which cells you don't want to be protected (to be user-editable) by setting the Locked status of them to False:

Worksheets("Sheet1").Range("B2:C3").Locked = False

Then, you can protect the sheet, and all the other cells will be protected. The code to do this, and still allow your VBA code to modify the cells is:

Worksheets("Sheet1").Protect UserInterfaceOnly:=True

Call Worksheets("Sheet1").Protect(UserInterfaceOnly:=True)

How to scp in Python?

if you install putty on win32 you get an pscp (putty scp).

so you can use the os.system hack on win32 too.

(and you can use the putty-agent for key-managment)

sorry it is only a hack (but you can wrap it in a python class)

Can a PDF file's print dialog be opened with Javascript?

I use named action instead of javascript because javascript often is disabled, and if it isn't it gives a warning.

My web application creates a postscript file that then is converted with ghostscript to a pdf. I want it to print automatically because the user has already clicked on print inside my application. With the information about named actions from @DSimon above, I researched how to solve this. It all boils down to insert the string /Type /Action /S /Named /N /Print at the right place in the pdf.

I was thinking of writing a small utility, but it has to parse the pdf to find the root node, insert /OpenAction with a reference an object with the action, and recalculate the byte-offsets in xref.

But then I found out about pdfmark which is an extension to postscript to express, in postscript syntax, idioms that are converted to pdf by Adobes distiller or by ghostscript.

Since I'm already using ghostscript, all I have to do is append the following to the end of my postscript file:

%AUTOPRINT
[ /_objdef {PrintAction} /type /dict /OBJ pdfmark
[ {PrintAction} << /Type /Action /S /Named /N /Print >> /PUT pdfmark
[ {Catalog} << /OpenAction {PrintAction} >> /PUT pdfmark

and ghostscript will create the action, link it, and calculate the xref offsets. (In postscript % is a comment and PrintAction is my name for the object)

By looking at the PDF I see that it has created this:

1 0 obj
<</Type /Catalog /Pages 3 0 R
/OpenAction  9 0 R
/Metadata 10 0 R
>>
endobj

9 0 obj
<</S/Named
/Type/Action
/N/Print>>endobj

1 0 is object 1, revision 0, and 9 0 is object 9, revision 0. In the pdf-trailer is says that it is object 1 that is the root node. As you can see there is a reference from object 1, /OpenAction to run object 9 revision 0.

With ghostscript it's possible to convert a pdf to postscript (pdf2ps), append the text above, and convert it back to pdf with ps2pdf. It should be noted that meta-information about the pdf is lost in this conversion. I haven't searched more into this.

Need a good hex editor for Linux

wxHexEditor is the only GUI disk editor for linux. to google "wxhexeditor site:archive.getdeb.net" and download the .deb file to install

Receiving "fatal: Not a git repository" when attempting to remote add a Git repo

Happened to me when my client Smartgit put a newline in my .git/HEAD file. Deleting the empty line fixed it.

Bootstrap date time picker

In order to run the bootstrap date time picker you need to include Moment.js as well. Here is the working code sample in your case.

_x000D_

<!DOCTYPE html>_x000D_
    <html lang="en">_x000D_
    <head>_x000D_
      <meta charset="utf-8">_x000D_
      <meta name="viewport" content="width=device-width, initial-scale=1">_x000D_
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">_x000D_
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>_x000D_
      <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>_x000D_
    _x000D_
    _x000D_
      <!-- <link rel="stylesheet" type="text/css" href="css/bootstrap-datetimepicker.css"> -->_x000D_
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.15.1/moment.min.js"></script>_x000D_
      <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.43/css/bootstrap-datetimepicker.min.css"> _x000D_
      <link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.43/css/bootstrap-datetimepicker-standalone.css"> _x000D_
      <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.43/js/bootstrap-datetimepicker.min.js"></script>_x000D_
    _x000D_
    </head>_x000D_
    _x000D_
    _x000D_
    <body>_x000D_
    _x000D_
       <div class="container">_x000D_
          <div class="row">_x000D_
            <div class='col-sm-6'>_x000D_
                <div class="form-group">_x000D_
                    <div class='input-group date' id='datetimepicker1'>_x000D_
                        <input type='text' class="form-control" />_x000D_
                        <span class="input-group-addon">_x000D_
                            <span class="glyphicon glyphicon-calendar"></span>_x000D_
                        </span>_x000D_
                    </div>_x000D_
                </div>_x000D_
            </div>_x000D_
            <script type="text/javascript">_x000D_
                $(function () {_x000D_
                    $('#datetimepicker1').datetimepicker();_x000D_
                });_x000D_
            </script>_x000D_
          </div>_x000D_
       </div>_x000D_
    _x000D_
    _x000D_
    </body>_x000D_
    </html>

_x000D_

How can I test that a variable is more than eight characters in PowerShell?

Use the length property of the [String] type:

if ($dbUserName.length -gt 8) {
    Write-Output "Please enter more than 8 characters."
    $dbUserName = Read-Host "Re-enter database username"
}

Please note that you have to use -gt instead of > in your if condition. PowerShell uses the following comparison operators to compare values and test conditions:

-eq = equals
-ne = not equals
-lt = less than
-gt = greater than
-le = less than or equals
-ge = greater than or equals

React.js, wait for setState to finish before triggering a function?

setState() has an optional callback parameter that you can use for this. You only need to change your code slightly, to this:

// Form Input
this.setState(
  {
    originId: input.originId,
    destinationId: input.destinationId,
    radius: input.radius,
    search: input.search
  },
  this.findRoutes         // here is where you put the callback
);

Notice the call to findRoutes is now inside the setState() call, as the second parameter.
Without () because you are passing the function.

How to find a Java Memory Leak

Well, there's always the low tech solution of adding logging of the size of your maps when you modify them, then search the logs for which maps are growing beyond a reasonable size.

Return array from function

At a minimum, change this:

function BlockID() {
    var IDs = new Array();
        images['s'] = "Images/Block_01.png";
        images['g'] = "Images/Block_02.png";
        images['C'] = "Images/Block_03.png";
        images['d'] = "Images/Block_04.png";
    return IDs;
}

To this:

function BlockID() {
    var IDs = new Object();
        IDs['s'] = "Images/Block_01.png";
        IDs['g'] = "Images/Block_02.png";
        IDs['C'] = "Images/Block_03.png";
        IDs['d'] = "Images/Block_04.png";
    return IDs;
}

There are a couple fixes to point out. First, images is not defined in your original function, so assigning property values to it will throw an error. We correct that by changing images to IDs. Second, you want to return an Object, not an Array. An object can be assigned property values akin to an associative array or hash -- an array cannot. So we change the declaration of var IDs = new Array(); to var IDs = new Object();.

After those changes your code will run fine, but it can be simplified further. You can use shorthand notation (i.e., object literal property value shorthand) to create the object and return it immediately:

function BlockID() {
    return {
            "s":"Images/Block_01.png"
            ,"g":"Images/Block_02.png"
            ,"C":"Images/Block_03.png"
            ,"d":"Images/Block_04.png"
    };
}

C++ - how to find the length of an integer

Closed formula for the longest int (I used int here, but works for any signed integral type):

1 + (int) ceil((8*sizeof(int)-1) * log10(2))

Explanation:

                  sizeof(int)                 // number bytes in int
                8*sizeof(int)                 // number of binary digits (bits)
                8*sizeof(int)-1               // discount one bit for the negatives
               (8*sizeof(int)-1) * log10(2)   // convert to decimal, because:
                                              // 1 bit == log10(2) decimal digits
    (int) ceil((8*sizeof(int)-1) * log10(2))  // round up to whole digits
1 + (int) ceil((8*sizeof(int)-1) * log10(2))  // make room for the minus sign

For an int type of 4 bytes, the result is 11. An example of 4 bytes int with 11 decimal digits is: "-2147483648".

If you want the number of decimal digits of some int value, you can use the following function:

unsigned base10_size(int value)
{
    if(value == 0) {
        return 1u;
    }

    unsigned ret;
    double dval;
    if(value > 0) {
        ret = 0;
        dval = value;
    } else {
        // Make room for the minus sign, and proceed as if positive.
        ret = 1;
        dval = -double(value);
    }

    ret += ceil(log10(dval+1.0));

    return ret;
}

I tested this function for the whole range of int in g++ 9.3.0 for x86-64.

Failed to load the JNI shared Library (JDK)

One of the easy ways to resolve it is to copy the jre folder from installed the JDK into the Eclipse installation folder. Make sure that JDK you copy from is the same architecture as your Eclipse installation.

I had to configure my machine that way, because I run both Eclipse and Appcelerator Titanium Studio on my machine. The Studio needs 32-bit Java, while Eclipse needs 64-bit.

What do I use for a max-heap implementation in Python?

Following up to Isaac Turner's excellent answer, I'd like put an example based on K Closest Points to the Origin using max heap.

from math import sqrt
import heapq


class MaxHeapObj(object):
    def __init__(self, val):
        self.val = val.distance
        self.coordinates = val.coordinates

    def __lt__(self, other):
        return self.val > other.val

    def __eq__(self, other):
        return self.val == other.val

    def __str__(self):
        return str(self.val)


class MinHeap(object):
    def __init__(self):
        self.h = []

    def heappush(self, x):
        heapq.heappush(self.h, x)

    def heappop(self):
        return heapq.heappop(self.h)

    def __getitem__(self, i):
        return self.h[i]

    def __len__(self):
        return len(self.h)


class MaxHeap(MinHeap):
    def heappush(self, x):
        heapq.heappush(self.h, MaxHeapObj(x))

    def heappop(self):
        return heapq.heappop(self.h).val

    def peek(self):
        return heapq.nsmallest(1, self.h)[0].val

    def __getitem__(self, i):
        return self.h[i].val


class Point():
    def __init__(self, x, y):
        self.distance = round(sqrt(x**2 + y**2), 3)
        self.coordinates = (x, y)


def find_k_closest(points, k):
    res = [Point(x, y) for (x, y) in points]
    maxh = MaxHeap()

    for i in range(k):
        maxh.heappush(res[i])

    for p in res[k:]:
        if p.distance < maxh.peek():
            maxh.heappop()
            maxh.heappush(p)

    res = [str(x.coordinates) for x in maxh.h]
    print(f"{k} closest points from origin : {', '.join(res)}")


points = [(10, 8), (-2, 4), (0, -2), (-1, 0), (3, 5), (-2, 3), (3, 2), (0, 1)]
find_k_closest(points, 3)

Why isn't my Pandas 'apply' function referencing multiple columns working?

All of the suggestions above work, but if you want your computations to by more efficient, you should take advantage of numpy vector operations (as pointed out here).

import pandas as pd
import numpy as np


df = pd.DataFrame ({'a' : np.random.randn(6),
             'b' : ['foo', 'bar'] * 3,
             'c' : np.random.randn(6)})

Example 1: looping with pandas.apply():

%%timeit
def my_test2(row):
    return row['a'] % row['c']

df['Value'] = df.apply(my_test2, axis=1)

The slowest run took 7.49 times longer than the fastest. This could mean that an intermediate result is being cached. 1000 loops, best of 3: 481 µs per loop

Example 2: vectorize using pandas.apply():

%%timeit
df['a'] % df['c']

The slowest run took 458.85 times longer than the fastest. This could mean that an intermediate result is being cached. 10000 loops, best of 3: 70.9 µs per loop

Example 3: vectorize using numpy arrays:

%%timeit
df['a'].values % df['c'].values

The slowest run took 7.98 times longer than the fastest. This could mean that an intermediate result is being cached. 100000 loops, best of 3: 6.39 µs per loop

So vectorizing using numpy arrays improved the speed by almost two orders of magnitude.

A TypeScript GUID class?

There is an implementation in my TypeScript utilities based on JavaScript GUID generators.

Here is the code:

_x000D_

class Guid {_x000D_
  static newGuid() {_x000D_
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {_x000D_
      var r = Math.random() * 16 | 0,_x000D_
        v = c == 'x' ? r : (r & 0x3 | 0x8);_x000D_
      return v.toString(16);_x000D_
    });_x000D_
  }_x000D_
}_x000D_
_x000D_
// Example of a bunch of GUIDs_x000D_
for (var i = 0; i < 100; i++) {_x000D_
  var id = Guid.newGuid();_x000D_
  console.log(id);_x000D_
}

_x000D_

Please note the following:

C# GUIDs are guaranteed to be unique. This solution is very likely to be unique. There is a huge gap between "very likely" and "guaranteed" and you don't want to fall through this gap.

JavaScript-generated GUIDs are great to use as a temporary key that you use while waiting for a server to respond, but I wouldn't necessarily trust them as the primary key in a database. If you are going to rely on a JavaScript-generated GUID, I would be tempted to check a register each time a GUID is created to ensure you haven't got a duplicate (an issue that has come up in the Chrome browser in some cases).

SQL: set existing column as Primary Key in MySQL

Either run in SQL:

ALTER TABLE tableName
  ADD PRIMARY KEY (id)           ---or Drugid, whichever you want it to be PK

or use the PHPMyAdmin interface (Table Structure)

Laravel orderBy on a relationship

Using sortBy... could help.

$users = User::all()->with('rated')->get()->sortByDesc('rated.rating');

Stash just a single file

The best option is to stage everything but this file, and tell stash to keep the index with git stash save --keep-index, thus stashing your unstaged file:

$ git add .
$ git reset thefiletostash
$ git stash save --keep-index

As Dan points out, thefiletostash is the only one to be reset by the stash, but it also stashes the other files, so it's not exactly what you want.

How to decorate a class?

I'd agree inheritance is a better fit for the problem posed.

I found this question really handy though on decorating classes, thanks all.

Here's another couple of examples, based on other answers, including how inheritance affects things in Python 2.7, (and @wraps, which maintains the original function's docstring, etc.):

def dec(klass):
    old_foo = klass.foo
    @wraps(klass.foo)
    def decorated_foo(self, *args ,**kwargs):
        print('@decorator pre %s' % msg)
        old_foo(self, *args, **kwargs)
        print('@decorator post %s' % msg)
    klass.foo = decorated_foo
    return klass

@dec  # No parentheses
class Foo...

Often you want to add parameters to your decorator:

from functools import wraps

def dec(msg='default'):
    def decorator(klass):
        old_foo = klass.foo
        @wraps(klass.foo)
        def decorated_foo(self, *args ,**kwargs):
            print('@decorator pre %s' % msg)
            old_foo(self, *args, **kwargs)
            print('@decorator post %s' % msg)
        klass.foo = decorated_foo
        return klass
    return decorator

@dec('foo decorator')  # You must add parentheses now, even if they're empty
class Foo(object):
    def foo(self, *args, **kwargs):
        print('foo.foo()')

@dec('subfoo decorator')
class SubFoo(Foo):
    def foo(self, *args, **kwargs):
        print('subfoo.foo() pre')
        super(SubFoo, self).foo(*args, **kwargs)
        print('subfoo.foo() post')

@dec('subsubfoo decorator')
class SubSubFoo(SubFoo):
    def foo(self, *args, **kwargs):
        print('subsubfoo.foo() pre')
        super(SubSubFoo, self).foo(*args, **kwargs)
        print('subsubfoo.foo() post')

SubSubFoo().foo()

Outputs:

@decorator pre subsubfoo decorator
subsubfoo.foo() pre
@decorator pre subfoo decorator
subfoo.foo() pre
@decorator pre foo decorator
foo.foo()
@decorator post foo decorator
subfoo.foo() post
@decorator post subfoo decorator
subsubfoo.foo() post
@decorator post subsubfoo decorator

I've used a function decorator, as I find them more concise. Here's a class to decorate a class:

class Dec(object):

    def __init__(self, msg):
        self.msg = msg

    def __call__(self, klass):
        old_foo = klass.foo
        msg = self.msg
        def decorated_foo(self, *args, **kwargs):
            print('@decorator pre %s' % msg)
            old_foo(self, *args, **kwargs)
            print('@decorator post %s' % msg)
        klass.foo = decorated_foo
        return klass

A more robust version that checks for those parentheses, and works if the methods don't exist on the decorated class:

from inspect import isclass

def decorate_if(condition, decorator):
    return decorator if condition else lambda x: x

def dec(msg):
    # Only use if your decorator's first parameter is never a class
    assert not isclass(msg)

    def decorator(klass):
        old_foo = getattr(klass, 'foo', None)

        @decorate_if(old_foo, wraps(klass.foo))
        def decorated_foo(self, *args ,**kwargs):
            print('@decorator pre %s' % msg)
            if callable(old_foo):
                old_foo(self, *args, **kwargs)
            print('@decorator post %s' % msg)

        klass.foo = decorated_foo
        return klass

    return decorator

The assert checks that the decorator has not been used without parentheses. If it has, then the class being decorated is passed to the msg parameter of the decorator, which raises an AssertionError.

@decorate_if only applies the decorator if condition evaluates to True.

The getattr, callable test, and @decorate_if are used so that the decorator doesn't break if the foo() method doesn't exist on the class being decorated.

What does Docker add to lxc-tools (the userspace LXC tools)?

Dockers use images which are build in layers. This adds a lot in terms of portability, sharing, versioning and other features. These images are very easy to port or transfer and since they are in layers, changes in subsequent versions are added in form of layers over previous layers. So, while porting many a times you don't need to port the base layers. Dockers have containers which run these images with execution environment contained, they add changes as new layers providing easy version control.

Apart from that Docker Hub is a good registry with thousands of public images, where you can find images which have OS and other softwares installed. So, you can get a pretty good head start for your application.

Switching a DIV background image with jQuery

Mine is animated:

$(this).animate({
    opacity: 0
}, 100, function() {
    // Callback
    $(this).css("background-image", "url(" + new_img + ")").promise().done(function(){
        // Callback of the callback :)
        $(this).animate({
            opacity: 1
        }, 600)
    });    
});

HTTP headers in Websockets client API

Technically, you will be sending these headers through the connect function before the protocol upgrade phase. This worked for me in a nodejs project:

var WebSocketClient = require('websocket').client;
var ws = new WebSocketClient();
ws.connect(url, '', headers);

Count occurrences of a char in a string using Bash

I Would suggest the following:

var="any given string"
N=${#var}
G=${var//g/}
G=${#G}
(( G = N - G ))
echo "$G"

No call to any other program

Set start value for column with autoincrement

You need to set the Identity seed to that value:

CREATE TABLE orders
(
 id int IDENTITY(9586,1)
)

To alter an existing table:

ALTER TABLE orders ALTER COLUMN Id INT IDENTITY (9586, 1);

More info on CREATE TABLE (Transact-SQL) IDENTITY (Property)

Git: Pull from other remote

git pull is really just a shorthand for git pull <remote> <branchname>, in most cases it's equivalent to git pull origin master. You will need to add another remote and pull explicitly from it. This page describes it in detail:

http://help.github.com/forking/

Disable a textbox using CSS

**just copy paste this code and run you can see the textbox disabled **

<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title> 

<style>.container{float:left;width:200px;height:25px;position:relative;}
       .container input{float:left;width:200px;height:25px;}
       .overlay{display:block;width:208px;position:absolute;top:0px;left:0px;height:32px;} 
</style>
 </head>
<body>
      <div class="container">
       <input type="text" value="[email protected]" />
       <div class="overlay">
        </div>
       </div> 
</body>
</html>

Why and when to use angular.copy? (Deep Copy)

I would say angular.copy(source); in your situation is unnecessary if later on you do not use is it without a destination angular.copy(source, [destination]);.

If a destination is provided, all of its elements (for arrays) or properties (for objects) are deleted and then all elements/properties from the source are copied to it.

https://docs.angularjs.org/api/ng/function/angular.copy

How to create a responsive image that also scales up in Bootstrap 3

Bootstrap's responsive image class sets max-width to 100%. This limits its size, but does not force it to stretch to fill parent elements larger than the image itself. You'd have to use the width attribute to force upscaling.

http://getbootstrap.com/css/#images-responsive

Is there a simple way to delete a list element by value?

Overwrite the list by indexing everything except the elements you wish to remove

>>> s = [5,4,3,2,1]
>>> s[0:2] + s[3:]
[5, 4, 2, 1]

More generally,

>>> s = [5,4,3,2,1]
>>> i = s.index(3)
>>> s[:i] + s[i+1:]
[5, 4, 2, 1]

How to link 2 cell of excel sheet?

The simplest solution is to select the second cell, and press =. This will begin the fomula creation process. Now either type in the 1st cell reference (eg, A1) or click on the first cell and press enter. This should make the second cell reference the value of the first cell.

To read up more on different options for referencing see - This Article.

Javascript onclick hide div

Simple & Best way:

onclick="parentNode.remove()"

Deletes the complete parent from html

How to create a XML object from String in Java?

try something like

public static Document loadXML(String xml) throws Exception
{
   DocumentBuilderFactory fctr = DocumentBuilderFactory.newInstance();
   DocumentBuilder bldr = fctr.newDocumentBuilder();
   InputSource insrc = new InputSource(new StringReader(xml));
   return bldr.parse(insrc);
}

How to modify PATH for Homebrew?

open bash profile in textEdit

open -e .bash_profile

Edit file or paste in front of PATH export PATH=/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/bin:/usr/local/sbin:~/bin

save & close the file

*To open .bash_profile directly open textEdit > file > recent

How can I fix the form size in a C# Windows Forms application and not to let user change its size?

Minimal settings to prevent resize events

form1.FormBorderStyle = FormBorderStyle.FixedDialog;
form1.MaximizeBox = false;

Git with SSH on Windows

I fought with this problem for a few hours before stumbling on the obvious answer. The problem I had was I was using different ssh implementations between when I generated my keys and when I used git.

I used ssh-keygen from the command prompt to generate my keys and but when I tried "git clone ssh://..." I got the same results as you, a prompt for the password and the message "fatal: The remote end hung up unexpectedly".

Determine which ssh windows is using by executing the Windows "where" command.

C:\where ssh
C:\Program Files (x86)\Git\bin\ssh.exe

The second line tells you which exact program will be executed.

Next you need to determine which ssh that git is using. Find this by:

C:\set GIT_SSH
GIT_SSH=C:\Program Files\TortoiseSVN\bin\TortoisePlink.exe

And now you see the problem.

To correct this simply execute:

C:\set GIT_SSH=C:\Program Files (x86)\Git\bin\ssh.exe

To check if changes are applied:

C:\set GIT_SSH
GIT_SSH=C:\Program Files (x86)\Git\bin\ssh.exe

Now git will be able to use the keys that you generated earlier.

This fix is so far only for the current window. To fix it completely you need to change your environment variable.

Open Windows explorer
Right-click Computer and select Properties
Click Advanced System Settings link on the left
Click the Environment Variables... button
In the system variables section select the GIT_SSH variable and press the Edit... button
Update the variable value.
Press OK to close all windows

Now any future command windows you open will have the correct settings.

Hope this helps.

WELD-001408: Unsatisfied dependencies for type Customer with qualifiers @Default

Your Customer class has to be discovered by CDI as a bean. For that you have two options:

Put a bean defining annotation on it. As @Model is a stereotype it's why it does the trick. A qualifier like @Named is not a bean defining annotation, reason why it doesn't work
Change the bean discovery mode in your bean archive from the default "annotated" to "all" by adding a beans.xml file in your jar.

Keep in mind that @Named has only one usage : expose your bean to the UI. Other usages are for bad practice or compatibility with legacy framework.

How to check cordova android version of a cordova/phonegap project?

After upgrading the Application. I observed different Cordova versions.

Apache Cordova Cli version which is 6.0.0.
Cordova Android version which is 5.1.0.
Cordova IOS version which is 4.1.1.
Docs version is which is 6.0.0, shown on the Cordova Docs website.

Now i am confused, On which version basis, Google Dev Console is giving warning?

Please migrate your app(s) to Apache Cordova v.4.1.1 or higher as soon as possible and increment the version number of the upgraded APK. Beginning May 9, 2016, Google Play will block publishing of any new apps or updates that use pre-4.1.1 versions of Apache Cordova.

The vulnerabilities were addressed in Apache Cordova 4.1.1. If you’re using a 3rd party library that bundles Apache Cordova, you’ll need to upgrade it to a version that bundles Apache Cordova 4.1.1 or later.

And before upgrading. Our Application versions were these.

Apache Cordova Cli version which is 5.4.1.
Cordova Android version which is 4.1.1.
Cordova IOS version which is 3.9.1.
Docs version is which is 5.4.1, shown on the Cordova Docs website.

How much RAM is SQL Server actually using?

You should explore SQL Server\Memory Manager performance counters.

How to keep the console window open in Visual C++?

I include #include <conio.h> and then, add getch(); just before the return 0; line. That's what I learnt at school anyway. The methods mentioned above here are quite different I see.

Jboss server error : Failed to start service jboss.deployment.unit."jbpm-console.war"

I had a similar issue, my error was:

Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: java.lang.ClassNotFoundException:org.glassfish.jersey.servlet.ServletContainer from [Module "deployment.RESTful_Services_CRUD.war:main" from Service Module Loader]

I use jboss and glassfish so I changed the web.xml to the following:

<servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>

Instead of:

<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>

Hope this work for you.

How to print without newline or space?

You will notice that all the above answers are correct. But I wanted to make a shortcut to always writing the " end='' " parameter in the end.

You could define a function like

def Print(*args,sep='',end='',file=None,flush=False):
    print(*args,sep=sep,end=end,file=file,flush=flush)

It would accept all the number of parameters. Even it will accept all the other parameters like file, flush ,etc and with the same name.

How to redirect to logon page when session State time out is completed in asp.net mvc

One way is that In case of Session Expire, in every action you have to check its session and if it is null then redirect to Login page.

But this is very hectic method To over come this you need to create your own ActionFilterAttribute which will do this, you just need to add this attribute in every action method.

Here is the Class which overrides ActionFilterAttribute.

public class SessionExpireFilterAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            HttpContext ctx = HttpContext.Current;

            // check if session is supported
            CurrentCustomer objCurrentCustomer = new CurrentCustomer();
            objCurrentCustomer = ((CurrentCustomer)SessionStore.GetSessionValue(SessionStore.Customer));
            if (objCurrentCustomer == null)
            {
                // check if a new session id was generated
                filterContext.Result = new RedirectResult("~/Users/Login");
                return;
            }

            base.OnActionExecuting(filterContext);
        }
    }

Then in action just add this attribute like so:

[SessionExpire]
public ActionResult Index()
{
     return Index();
}

This will do you work.

How to make the python interpreter correctly handle non-ASCII characters in string operations?

Way too late for an answer, but the original string was in UTF-8 and '\xc2\xa0' is UTF-8 for NO-BREAK SPACE. Simply decode the original string as s.decode('utf-8') (\xa0 displays as a space when decoded incorrectly as Windows-1252 or latin-1:

Example (Python 3)

s = b'6\xc2\xa0918\xc2\xa0417\xc2\xa0712'
print(s.decode('latin-1')) # incorrectly decoded
u = s.decode('utf8') # correctly decoded
print(u)
print(u.replace('\N{NO-BREAK SPACE}','_'))
print(u.replace('\xa0','-')) # \xa0 is Unicode for NO-BREAK SPACE

Output

6Â 918Â 417Â 712
6 918 417 712
6_918_417_712
6-918-417-712

How to Pass data from child to parent component Angular

@Output() onDatePicked = new EventEmitter<any>();

Emit value on click:

public pickDate(date: any): void {
    this.onDatePicked.emit(date);
}

Listen for the events in your parent component's template:

<div>
    <calendar (onDatePicked)="doSomething($event)"></calendar>
</div>

and in the parent component:

public doSomething(date: any):void {
    console.log('Picked date: ', date);
}

It's also well explained in the official docs: Component interaction.

How to print matched regex pattern using awk?

If you know what column the text/pattern you're looking for (e.g. "yyy") is in, you can just check that specific column to see if it matches, and print it.

For example, given a file with the following contents, (called asdf.txt)

xxx yyy zzz

to only print the second column if it matches the pattern "yyy", you could do something like this:

awk '$2 ~ /yyy/ {print $2}' asdf.txt

Note that this will also match basically any line where the second column has a "yyy" in it, like these:

xxx yyyz zzz
xxx zyyyz

How do I convert a list of ascii values to a string in python?

You can use bytes(list).decode() to do this - and list(string.encode()) to get the values back.

How to set the min and max height or width of a Frame?

There is no single magic function to force a frame to a minimum or fixed size. However, you can certainly force the size of a frame by giving the frame a width and height. You then have to do potentially two more things: when you put this window in a container you need to make sure the geometry manager doesn't shrink or expand the window. Two, if the frame is a container for other widget, turn grid or pack propagation off so that the frame doesn't shrink or expand to fit its own contents.

Note, however, that this won't prevent you from resizing a window to be smaller than an internal frame. In that case the frame will just be clipped.

import Tkinter as tk

root = tk.Tk()
frame1 = tk.Frame(root, width=100, height=100, background="bisque")
frame2 = tk.Frame(root, width=50, height = 50, background="#b22222")

frame1.pack(fill=None, expand=False)
frame2.place(relx=.5, rely=.5, anchor="c")

root.mainloop()

Rails DB Migration - How To Drop a Table?

The simple and official way would be this:

  rails g migration drop_tablename

Now go to your db/migrate and look for your file which contains the drop_tablename as the filename and edit it to this.

    def change
      drop_table :table_name
    end

Then you need to run

    rake db:migrate

on your console.

Are there any Java method ordering conventions?

The more precise link to «Code Conventions»: «Class and Interface Declarations»

jQuery: Get the cursor position of text in input without browser specific code?

A warning about the Jquery Caret plugin.

It will conflict with the Masked Input plugin (or vice versa). Fortunately the Masked Input plugin includes a caret() function of its own, which you can use very similarly to the Caret plugin for your basic needs - $(element).caret().begin or .end

How to set specific Java version to Maven

Adding my two cents and explicitly providing the solution.

I have two JDKs installed on my Windows Machine - JDK 1.5 and JDK 1.6.

My default (and set to windows system environment variable) JAVA_HOME is set to JDK 1.5.

However, I have a maven project that I need to build (i.e., JBehave Tutorial's Etsy.com) using JDK 1.6.

My solution in this scenario (which worked!), is as suggested by @DanielBarbarian to set it in mvn.bat.

For some not familiar with window's batch file, I just basically added the set JAVA_HOME=<path_to_other_jdk> line after @REM ==== START VALIDATION ==== in mvn.bat (i.e., %MAVEN_HOME%\bin\mvn.bat):

@REM ==== START VALIDATION ====
set JAVA_HOME=C:\Program Files\Java\jdk1.6.0_45\jre
if not "%JAVA_HOME%" == "" goto OkJHome

Python try-else

Looking at Python reference it seems that else is executed after try when there's no exception. The optional else clause is executed if and when control flows off the end of the try clause. 2 Exceptions in the else clause are not handled by the preceding except clauses.

Dive into python has an example where, if I understand correctly, in try block they try to import a module, when that fails you get exception and bind default but when it works you have an option to go into else block and bind what is required (see link for the example and explanation).

If you tried to do work in catch block it might throw another exception - I guess that's where the else block comes handy.

Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener

If you are sure you haven't messed the jar, then please clean the project and perform mvn clean install. This should solve the problem.

Modulo operator in Python

In addition to the other answers, the fmod documentation has some interesting things to say on the subject:

math.fmod(x, y)

Return fmod(x, y), as defined by the platform C library. Note that the Python expression x % y may not return the same result. The intent of the C standard is that fmod(x, y) be exactly (mathematically; to infinite precision) equal to x - n*y for some integer n such that the result has the same sign as x and magnitude less than abs(y). Python’s x % y returns a result with the sign of y instead, and may not be exactly computable for float arguments. For example, fmod(-1e-100, 1e100) is -1e-100, but the result of Python’s -1e-100 % 1e100 is 1e100-1e-100, which cannot be represented exactly as a float, and rounds to the surprising 1e100. For this reason, function fmod() is generally preferred when working with floats, while Python’s x % y is preferred when working with integers.

<div style display="none" > inside a table not working

simply change <div> to <tbody>

<table id="authenticationSetting" style="display: none">
  <tbody id="authenticationOuterIdentityBlock" style="display: none;">
    <tr>
      <td class="orionSummaryHeader">
        <orion:message key="policy.wifi.enterprise.authentication.outeridentitity" />:</td>
      <td class="orionSummaryColumn">
        <orion:textbox id="authenticationOuterIdentity" size="30" />
      </td>
    </tr>
  </tbody>
</table>

Print to standard printer from Python?

This has only been tested on Windows:

You can do the following:

import os

os.startfile("C:/Users/TestFile.txt", "print")

This will start the file, in its default opener, with the verb 'print', which will print to your default printer.Only requires the os module which comes with the standard library

Xcode - iPhone - profile doesn't match any valid certificate-/private-key pair in the default keychain

your Apple developer certificate might have expired or else ur system date is greater than your account expiry date

Matching an empty input box using CSS

I'm wondered by answers we have clear attribute to get empty input boxes, take a look at this code

/*empty input*/
input:empty{
    border-color: red;
}
/*input with value*/
input:not(:empty){
    border-color: black;
}

UPDATE

input, select, textarea {
    border-color: @green;
    &:empty {
        border-color: @red;
    }
}

More over for having a great look in the validation

 input, select, textarea {
    &[aria-invalid="true"] {
        border-color: amber !important;
    }

    &[aria-invalid="false"], &.valid {
        border-color: green !important;
    }
}

add a string prefix to each value in a string column using Pandas

You can use pandas.Series.map :

df['col'].map('str{}'.format)

It will apply the word "str" before all your values.

How do I disable log messages from the Requests library?

import logging
urllib3_logger = logging.getLogger('urllib3')
urllib3_logger.setLevel(logging.CRITICAL)

In this way all the messages of level=INFO from urllib3 won't be present in the logfile.

So you can continue to use the level=INFO for your log messages...just modify this for the library you are using.

NGinx Default public www location?

The default Nginx directory on Debian is /var/www/nginx-default.

You can check the file: /etc/nginx/sites-enabled/default

and find

server {
        listen   80 default;
        server_name  localhost;

        access_log  /var/log/nginx/localhost.access.log;

        location / {
                root   /var/www/nginx-default;
                index  index.html index.htm;
        }

The root is the default location.

Bootstrap 3 .img-responsive images are not responsive inside fieldset in FireFox

add condition only firefox in your custom css file.

/* only Firefox */
@-moz-document url-prefix() {
   .img-responsive, .thumbnail>img, .thumbnail a>img, .carousel-inner>.item>img, .carousel-inner>.item>a>img {
      width: 100%;
   }
}

exception.getMessage() output with class name

I think you are wrapping your exception in another exception (which isn't in your code above). If you try out this code:

public static void main(String[] args) {
    try {
        throw new RuntimeException("Cannot move file");
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(null, "Error: " + ex.getMessage());
    }
}

...you will see a popup that says exactly what you want.

However, to solve your problem (the wrapped exception) you need get to the "root" exception with the "correct" message. To do this you need to create a own recursive method getRootCause:

public static void main(String[] args) {
    try {
        throw new Exception(new RuntimeException("Cannot move file"));
    } catch (Exception ex) {
        JOptionPane.showMessageDialog(null,
                                      "Error: " + getRootCause(ex).getMessage());
    }
}

public static Throwable getRootCause(Throwable throwable) {
    if (throwable.getCause() != null)
        return getRootCause(throwable.getCause());

    return throwable;
}

Note: Unwrapping exceptions like this however, sort of breaks the abstractions. I encourage you to find out why the exception is wrapped and ask yourself if it makes sense.

Inconsistent accessibility: property type is less accessible

Your Delivery class is internal (the default visibility for classes), however the property (and presumably the containing class) are public, so the property is more accessible than the Delivery class. You need to either make Delivery public, or restrict the visibility of the thelivery property.

iOS app with framework crashed on device, dyld: Library not loaded, Xcode 6 Beta

In my case the solution was to remove the compiled framework from the Embedded Binaries, which was a standalone project in the workspace, clean and rebuild it, and finally re-add to Embedded Binaries.

Most efficient way to get table row count

if you directly get get max number by writing select query then there may chance that your query will give wrong value. e.g. if your table has 5 records so your increment id will be 6 and if I delete record no 5 the your table has 4 records with max id is 4 in this case you will get 5 as next increment id. insted to that you can get info from mysql defination itself. by writing following code in php

<?
$tablename      = "tablename";
$next_increment     = 0;
$qShowStatus        = "SHOW TABLE STATUS LIKE '$tablename'";
$qShowStatusResult  = mysql_query($qShowStatus) or die ( "Query failed: " . mysql_error() . "<br/>" . $qShowStatus );

$row = mysql_fetch_assoc($qShowStatusResult);
$next_increment = $row['Auto_increment'];

echo "next increment number: [$next_increment]";
?>

Fatal error: Call to a member function prepare() on null

In ---- model: Add use Jenssegers\Mongodb\Eloquent\Model as Eloquent;

Change the class ----- extends Model to class ----- extends Eloquent

Exiting from python Command Line

When you type exit in the command line, it finds the variable with that name and calls __repr__ (or __str__) on it. Usually, you'd get a result like:

<function exit at 0x00B97FB0>

But they decided to redefine that function for the exit object to display a helpful message instead. Whether or not that's a stupid behavior or not, is a subjective question, but one possible reason why it doesn't "just exit" is:

Suppose you're looking at some code in a debugger, for instance, and one of the objects references the exit function. When the debugger tries to call __repr__ on that object to display that function to you, the program suddenly stops! That would be really unexpected, and the measures to counter that might complicate things further (for instance, even if you limit that behavior to the command line, what if you try to print some object that have exit as an attribute?)

what is the use of "response.setContentType("text/html")" in servlet

response.setContentType("text/html");

Above code would be include in "HTTP response" to inform the browser about the format of the response, so that the browser can interpret it.

Parsing JSON array with PHP foreach

You need to tell it which index in data to use, or double loop through all.

E.g., to get the values in the 4th index in the outside array.:

foreach($user->data[3]->values as $values)
{
     echo $values->value . "\n";
}

To go through all:

foreach($user->data as $mydata)
{
    foreach($mydata->values as $values) {
        echo $values->value . "\n";
    }

}

Difference between HashSet and HashMap?

Differences between HashSet and HashMap in Java

HashSet internally uses HashMap to store objects.when add(String) method called it calls HahsMap put(key,value) method where key=String object & value=new Object(Dummy).so it maintain no duplicates because keys are nothing but Value Object.

the Objects which are stored as key in Hashset/HashMap should override hashcode & equals contract.

Keys which are used to access/store value objects in HashMap should declared as Final because when it is modified Value object can't be located & returns null.

How to convert string to boolean in typescript Angular 4

Define extension: String+Extension.ts

interface String {
  toBoolean(): boolean
}

String.prototype.toBoolean = function (): boolean {
  switch (this) {
    case 'true':
    case '1':
    case 'on':
    case 'yes':
      return true
    default:
      return false
  }
}

And import in any file where you want to use it '@/path/to/String+Extension'

Close Window from ViewModel

System.Environment.Exit(0); in view model would work.

Call int() function on every list element?

If you are intending on passing those integers to a function or method, consider this example:

sum(int(x) for x in numbers)

This construction is intentionally remarkably similar to list comprehensions mentioned by adamk. Without the square brackets, it's called a generator expression, and is a very memory-efficient way of passing a list of arguments to a method. A good discussion is available here: Generator Expressions vs. List Comprehension

How does the compilation/linking process work?

On the standard front:

a translation unit is the combination of a source files, included headers and source files less any source lines skipped by conditional inclusion preprocessor directive.
the standard defines 9 phases in the translation. The first four correspond to preprocessing, the next three are the compilation, the next one is the instantiation of templates (producing instantiation units) and the last one is the linking.

In practice the eighth phase (the instantiation of templates) is often done during the compilation process but some compilers delay it to the linking phase and some spread it in the two.

How to pass Multiple Parameters from ajax call to MVC Controller

$.ajax({
  type: "POST",
  contentType: "application/json; charset=utf-8",
  url: "ChnagePassword.aspx/AutocompleteSuggestions",
  data: "{'searchstring':'" + request.term + "','st':'Arb'}",
  dataType: "json",
  success: function (data) {
     response($.map(data.d, function (item) {
         return { value: item }
     }))
  },
  error: function (result) {
      alert("Error");
  }
});

PDO closing connection

$conn=new PDO("mysql:host=$host;dbname=$dbname",$user,$pass);
    // If this is your connection then you have to assign null
    // to your connection variable as follows:
$conn=null;
    // By this way you can close connection in PDO.

Streaming via RTSP or RTP in HTML5

Chrome not implement support RTSP streaming. An important project to check it WebRTC.

"WebRTC is a free, open project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs"

Supported Browsers:

Chrome, Firefox and Opera.

Supported Mobile Platforms:

Android and IOS

http://www.webrtc.org/

How do I detect unsigned integer multiply overflow?

I see that a lot of people answered the question about overflow, but I wanted to address his original problem. He said the problem was to find a^b=c such that all digits are used without repeating. Ok, that's not what he asked in this post, but I'm still think that it was necessary to study the upper bound of the problem and conclude that he would never need to calculate or detect an overflow (note: I'm not proficient in math so I did this step by step, but the end result was so simple that this might have a simple formula).

The main point is that the upper bound that the problem requires for either a, b or c is 98.765.432. Anyway, starting by splitting the problem in the trivial and non trivial parts:

x⁰ == 1 (all permutations of 9, 8, 7, 6, 5, 4, 3, 2 are solutions)
x¹ == x (no solution possible)
0^b == 0 (no solution possible)
1^b == 1 (no solution possible)
a^b, a > 1, b > 1 (non trivial)

Now we just need to show that no other solution is possible and only the permutations are valid (and then the code to print them is trivial). We go back to the upper bound. Actually the upper bound is c = 98.765.432. It's the upper bound because it's the largest number with 8 digits (10 digits total minus 1 for each a and b). This upper bound is only for c because the bounds for a and b must be much lower because of the exponential growth, as we can calculate, varying b from 2 to the upper bound:

    9938.08^2 == 98765432
    462.241^3 == 98765432
    99.6899^4 == 98765432
    39.7119^5 == 98765432
    21.4998^6 == 98765432
    13.8703^7 == 98765432
    9.98448^8 == 98765432
    7.73196^9 == 98765432
    6.30174^10 == 98765432
    5.33068^11 == 98765432
    4.63679^12 == 98765432
    4.12069^13 == 98765432
    3.72429^14 == 98765432
    3.41172^15 == 98765432
    3.15982^16 == 98765432
    2.95305^17 == 98765432
    2.78064^18 == 98765432
    2.63493^19 == 98765432
    2.51033^20 == 98765432
    2.40268^21 == 98765432
    2.30883^22 == 98765432
    2.22634^23 == 98765432
    2.15332^24 == 98765432
    2.08826^25 == 98765432
    2.02995^26 == 98765432
    1.97741^27 == 98765432

Notice, for example the last line: it says that 1.97^27 ~98M. So, for example, 1^27 == 1 and 2^27 == 134.217.728 and that's not a solution because it has 9 digits (2 > 1.97 so it's actually bigger than what should be tested). As it can be seen, the combinations available for testing a and b are really small. For b == 14, we need to try 2 and 3. For b == 3, we start at 2 and stop at 462. All the results are granted to be less than ~98M.

Now just test all the combinations above and look for the ones that do not repeat any digits:

    ['0', '2', '4', '5', '6', '7', '8'] 84^2 = 7056
    ['1', '2', '3', '4', '5', '8', '9'] 59^2 = 3481
    ['0', '1', '2', '3', '4', '5', '8', '9'] 59^2 = 3481 (+leading zero)
    ['1', '2', '3', '5', '8'] 8^3 = 512
    ['0', '1', '2', '3', '5', '8'] 8^3 = 512 (+leading zero)
    ['1', '2', '4', '6'] 4^2 = 16
    ['0', '1', '2', '4', '6'] 4^2 = 16 (+leading zero)
    ['1', '2', '4', '6'] 2^4 = 16
    ['0', '1', '2', '4', '6'] 2^4 = 16 (+leading zero)
    ['1', '2', '8', '9'] 9^2 = 81
    ['0', '1', '2', '8', '9'] 9^2 = 81 (+leading zero)
    ['1', '3', '4', '8'] 3^4 = 81
    ['0', '1', '3', '4', '8'] 3^4 = 81 (+leading zero)
    ['2', '3', '6', '7', '9'] 3^6 = 729
    ['0', '2', '3', '6', '7', '9'] 3^6 = 729 (+leading zero)
    ['2', '3', '8'] 2^3 = 8
    ['0', '2', '3', '8'] 2^3 = 8 (+leading zero)
    ['2', '3', '9'] 3^2 = 9
    ['0', '2', '3', '9'] 3^2 = 9 (+leading zero)
    ['2', '4', '6', '8'] 8^2 = 64
    ['0', '2', '4', '6', '8'] 8^2 = 64 (+leading zero)
    ['2', '4', '7', '9'] 7^2 = 49
    ['0', '2', '4', '7', '9'] 7^2 = 49 (+leading zero)

None of them matches the problem (which can also be seen by the absence of '0', '1', ..., '9').

The example code that solves it follows. Also note that's written in Python, not because it needs arbitrary precision integers (the code doesn't calculate anything bigger than 98 million), but because we found out that the amount of tests is so small that we should use a high level language to make use of its built-in containers and libraries (also note: the code has 28 lines).

    import math

    m = 98765432
    l = []
    for i in xrange(2, 98765432):
        inv = 1.0/i
        r = m**inv
        if (r < 2.0): break
        top = int(math.floor(r))
        assert(top <= m)

        for j in xrange(2, top+1):
            s = str(i) + str(j) + str(j**i)
            l.append((sorted(s), i, j, j**i))
            assert(j**i <= m)

    l.sort()
    for s, i, j, ji in l:
        assert(ji <= m)
        ss = sorted(set(s))
        if s == ss:
            print '%s %d^%d = %d' % (s, i, j, ji)

        # Try with non significant zero somewhere
        s = ['0'] + s
        ss = sorted(set(s))
        if s == ss:
            print '%s %d^%d = %d (+leading zero)' % (s, i, j, ji)

ArrayList - How to modify a member of an object?

Fixed. I was wrong: this only applies on element reassignment. I thought that the returned object wasn't referencing the new one.

It can be done.

Q: Why?
A: The get() method returns an object referencing the original one.

So, if you write myArrayList.get(15).itsVariable = 7
or
myArrayList.get(15).myMethod("My Value"),
you are actually assigning a value / using a method from the object referenced by the returned one (this means, the change is applied to the original object)

The only thing you can't do is myArrayList.get(15) = myNewElement. To do this you have to use list.set() method.

ASP.NET: HTTP Error 500.19 – Internal Server Error 0x8007000d

I understand that this error can occur because of many different reasons. In my case it was because I uninstalled WSUS service from Server Roles and the whole IIS went down. After doing a bit of research I found that uninstalling WSUS removes a few dlls which are used to do http compression. Since those dlls were missing and the IIS was still looking for them I did a reset using the following command in CMD:

appcmd set config -section:system.webServer/httpCompression /-[name='xpress']

Bingo! The problem is sorted now. Dont forget to run it as an administrator. You might also need to do "iisreset" as well. Just in case.

Hope it helps others. Cheers

php exec command (or similar) to not wait for result

I know this question has been answered but the answers i found here didn't work for my scenario ( or for Windows ).

I am using windows 10 laptop with PHP 7.2 in Xampp v3.2.4.

$command = 'php Cron.php send_email "'. $id .'"';
if ( substr(php_uname(), 0, 7) == "Windows" )
{
    //windows
    pclose(popen("start /B " . $command . " 1> temp/update_log 2>&1 &", "r"));
}
else
{
    //linux
    shell_exec( $command . " > /dev/null 2>&1 &" );
}

This worked perfectly for me.

I hope it will help someone with windows. Cheers.

Find the last element of an array while using a foreach loop in PHP

Another way to go is to remember the previous loop cycle result and use that as the end result:

    $result = $where = "";
    foreach ($conditions as $col => $val) {
        $result = $where .= $this->getAdapter()->quoteInto($col.' = ?', $val);
        $where .=  " AND ";
    }
    return $this->delete($result);

Running a command in a new Mac OS X Terminal window

Here's yet another take on it (also using AppleScript):

function newincmd() { 
   declare args 
   # escape single & double quotes 
   args="${@//\'/\'}" 
   args="${args//\"/\\\"}" 
   printf "%s" "${args}" | /usr/bin/pbcopy 
   #printf "%q" "${args}" | /usr/bin/pbcopy 
   /usr/bin/open -a Terminal 
   /usr/bin/osascript -e 'tell application "Terminal" to do script with command "/usr/bin/clear; eval \"$(/usr/bin/pbpaste)\""' 
   return 0 
} 

newincmd ls 

newincmd echo "hello \" world" 
newincmd echo $'hello \' world'

see: codesnippets.joyent.com/posts/show/1516

ASP.NET email validator regex

E-mail addresses are very difficult to verify correctly with a mere regex. Here is a pretty scary regex that supposedly implements RFC822, chapter 6, the specification of valid e-mail addresses.

Not really an answer, but maybe related to what you're trying to accomplish.

jquery, find next element by class

In this case you need to go up to the <tr> then use .next(), like this:

$(obj).closest('tr').next().find('.class');

Or if there may be rows in-between without the .class inside, you can use .nextAll(), like this:

$(obj).closest('tr').nextAll(':has(.class):first').find('.class');

Check array position for null/empty

If the array contains integers, the value cannot be NULL. NULL can be used if the array contains pointers.

SomeClass* myArray[2];
myArray[0] = new SomeClass();
myArray[1] = NULL;

if (myArray[0] != NULL) { // this will be executed }
if (myArray[1] != NULL) { // this will NOT be executed }

As http://en.cppreference.com/w/cpp/types/NULL states, NULL is a null pointer constant!

How to download fetch response in react as file

You can use these two libs to download files http://danml.com/download.html https://github.com/eligrey/FileSaver.js/#filesaverjs

example

//  for FileSaver
import FileSaver from 'file-saver';
export function exportRecordToExcel(record) {
      return ({fetch}) => ({
        type: EXPORT_RECORD_TO_EXCEL,
        payload: {
          promise: fetch('/records/export', {
            credentials: 'same-origin',
            method: 'post',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify(data)
          }).then(function(response) {
            return response.blob();
          }).then(function(blob) {
            FileSaver.saveAs(blob, 'nameFile.zip');
          })
        }
      });

//  for download 
let download = require('./download.min');
export function exportRecordToExcel(record) {
      return ({fetch}) => ({
        type: EXPORT_RECORD_TO_EXCEL,
        payload: {
          promise: fetch('/records/export', {
            credentials: 'same-origin',
            method: 'post',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify(data)
          }).then(function(response) {
            return response.blob();
          }).then(function(blob) {
            download (blob);
          })
        }
      });

CSS - How to Style a Selected Radio Buttons Label?

Here's an accessible solution

_x000D_

label {_x000D_
  position: relative;_x000D_
}_x000D_
_x000D_
label input {_x000D_
  position: absolute;_x000D_
  opacity: 0;_x000D_
}_x000D_
_x000D_
label:focus-within {_x000D_
  outline: 1px solid orange;_x000D_
}

_x000D_

<div class="radio-toolbar">_x000D_
  <label><input type="radio" value="all" checked>All</label>_x000D_
  <label><input type="radio" value="false">Open</label>_x000D_
  <label><input type="radio" value="true">Archived</label>_x000D_
</div>

_x000D_

How to prettyprint a JSON file?

The json module already implements some basic pretty printing with the indent parameter that specifies how many spaces to indent by:

>>> import json
>>>
>>> your_json = '["foo", {"bar":["baz", null, 1.0, 2]}]'
>>> parsed = json.loads(your_json)
>>> print(json.dumps(parsed, indent=4, sort_keys=True))
[
    "foo", 
    {
        "bar": [
            "baz", 
            null, 
            1.0, 
            2
        ]
    }
]

To parse a file, use json.load():

with open('filename.txt', 'r') as handle:
    parsed = json.load(handle)

mcrypt is deprecated, what is the alternative?

I was able to translate my Crypto object

Get a copy of php with mcrypt to decrypt the old data. I went to http://php.net/get/php-7.1.12.tar.gz/from/a/mirror, compiled it, then added the ext/mcrypt extension (configure;make;make install). I think I had to add the extenstion=mcrypt.so line to the php.ini as well. A series of scripts to build intermediate versions of the data with all data unencrypted.

Build a public and private key for openssl

openssl genrsa -des3 -out pkey.pem 2048
(set a password)
openssl rsa -in pkey.pem -out pkey-pub.pem -outform PEM -pubout

To Encrypt (using public key) use openssl_seal. From what I've read, openssl_encrypt using an RSA key is limited to 11 bytes less than the key length (See http://php.net/manual/en/function.openssl-public-encrypt.php comment by Thomas Horsten)
```
$pubKey = openssl_get_publickey(file_get_contents('./pkey-pub.pem'));
openssl_seal($pwd, $sealed, $ekeys, [ $pubKey ]);
$encryptedPassword = base64_encode($sealed);
$key = base64_encode($ekeys[0]);
```

You could probably store the raw binary.

To Decrypt (using private key)

$passphrase="passphrase here";
$privKey = openssl_get_privatekey(file_get_contents('./pkey.pem'), $passphrase);
// I base64_decode() from my db columns
openssl_open($encryptedPassword, $plain, $key, $privKey);
echo "<h3>Password=$plain</h3>";

P.S. You can't encrypt the empty string ("")

P.P.S. This is for a password database not for user validation.

How can I store the result of a system command in a Perl variable?

Using backtick or qx helps, thanks everybody for the answers. However, I found that if you use backtick or qx, the output contains trailing newline and I need to remove that. So I used chomp.

chomp($host = `hostname`);
chomp($domain = `domainname`);
$fqdn = $host.".".$domain;

More information here: http://irouble.blogspot.in/2011/04/perl-chomp-backticks.html

Difference between break and continue statement

The break statement breaks out of the loop (the next statement to be executed is the first one after the closing brace), while continue starts the loop over at the next iteration.

How to configure encoding in Maven?

If you combine the answers above, finally a pom.xml that configured for UTF-8 should seem like that.

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>YOUR_COMPANY</groupId>
    <artifactId>YOUR_APP</artifactId>
    <version>1.0.0-SNAPSHOT</version>

    <properties>
        <project.java.version>1.8</project.java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>

    <dependencies>
        <!-- Your dependencies -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>${project.java.version}</source>
                    <target>${project.java.version}</target>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.0.2</version>
                <configuration>
                    <encoding>${project.build.sourceEncoding}</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Unable to Resolve Module in React Native App

In my case I needed to import using an extended file path

i.e:

WRONG: import MyComponent from "componentFolder/myComponent";

RIGHT: import MyComponent from "../myAppFolder/componentFolder/myComponent";

Both of these showed no Typescript errors, but only the bottom one worked.

array of string with unknown size

Is there a specific reason why you need to use an array? If you don't know the size before hand you might want to use List<String>

List<String> list = new List<String>();

list.Add("Hello");
list.Add("world");
list.Add("!");

Console.WriteLine(list[2]);

Will give you an output of

MSDN - List(T) for more information

Get single listView SelectedItem

I do this like that:

if (listView1.SelectedItems.Count > 0)
{
     var item = listView1.SelectedItems[0];
     //rest of your logic
}

Display images in asp.net mvc

Make sure you image is a relative path such as:

@Url.Content("~/Content/images/myimage.png")

MVC4

<img src="~/Content/images/myimage.png" />

You could convert the byte[] into a Base64 string on the fly.

string base64String = Convert.ToBase64String(imageBytes);

<img src="@String.Format("data:image/png;base64,{0}", base64string)" />

CSS: Change image src on img:hover

There is another simple way using HTML and CSS only!

Just wrap your <img> tag with div like so:

<div class="image-wrapper">
    <img src="http://dummyimage.com/100x100/000/fff">
</div>

Then, in your CSS file hide the img and set the background image for the wrapping div element:

.image-wrapper:hover {
    background-image: url(http://dummyimage.com/100x100/eb00eb/fff);
    background-size: contain;
    background-repeat: no-repeat;
}

.image-wrapper:hover img {
    display: none;
}

Et voilà!

How to capture and save an image using custom camera in Android?

Following Snippet will help you

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.vogella.cameara.api"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="15" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name="de.vogella.camera.api.MakePhotoActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:id="@+id/captureFront"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:onClick="onClick"
        android:text="Make Photo" />

</RelativeLayout>

PhotoHandler.java

package org.sample;

import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

public class PhotoHandler implements PictureCallback {

    private final Context context;

    public PhotoHandler(Context context) {
        this.context = context;
    }

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {

        File pictureFileDir = getDir();

        if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {

            Log.d(Constants.DEBUG_TAG, "Can't create directory to save image.");
            Toast.makeText(context, "Can't create directory to save image.",
                    Toast.LENGTH_LONG).show();
            return;

        }

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
        String date = dateFormat.format(new Date());
        String photoFile = "Picture_" + date + ".jpg";

        String filename = pictureFileDir.getPath() + File.separator + photoFile;

        File pictureFile = new File(filename);

        try {
            FileOutputStream fos = new FileOutputStream(pictureFile);
            fos.write(data);
            fos.close();
            Toast.makeText(context, "New Image saved:" + photoFile,
                    Toast.LENGTH_LONG).show();
        } catch (Exception error) {
            Log.d(Constants.DEBUG_TAG, "File" + filename + "not saved: "
                    + error.getMessage());
            Toast.makeText(context, "Image could not be saved.",
                    Toast.LENGTH_LONG).show();
        }
    }

    private File getDir() {
        File sdDir = Environment
          .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        return new File(sdDir, "CameraAPIDemo");
    }
}

MakePhotoActivity.java

package org.sample;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.CameraInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import de.vogella.cameara.api.R;

public class MakePhotoActivity extends Activity {
    private final static String DEBUG_TAG = "MakePhotoActivity";
    private Camera camera;
    private int cameraId = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // do we have a camera?
        if (!getPackageManager()
                .hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
            Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG)
                    .show();
        } else {
            cameraId = findFrontFacingCamera();
            camera = Camera.open(cameraId);
            if (cameraId < 0) {
                Toast.makeText(this, "No front facing camera found.",
                        Toast.LENGTH_LONG).show();
            }
        }
    }

    public void onClick(View view) {
        camera.takePicture(null, null,
                new PhotoHandler(getApplicationContext()));
    }

    private int findFrontFacingCamera() {
        int cameraId = -1;
        // Search for the front facing camera
        int numberOfCameras = Camera.getNumberOfCameras();
        for (int i = 0; i < numberOfCameras; i++) {
            CameraInfo info = new CameraInfo();
            Camera.getCameraInfo(i, info);
            if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
                Log.d(DEBUG_TAG, "Camera found");
                cameraId = i;
                break;
            }
        }
        return cameraId;
    }

    @Override
    protected void onPause() {
        if (camera != null) {
            camera.release();
            camera = null;
        }
        super.onPause();
    }

}

How do I compare a value to a backslash?

If message.value[] is string:

if message.value[0] in ('/', '\'):
    do_stuff()

If it not str

Class type check in TypeScript

4.19.4 The instanceof operator

The instanceof operator requires the left operand to be of type Any, an object type, or a type parameter type, and the right operand to be of type Any or a subtype of the 'Function' interface type. The result is always of the Boolean primitive type.

So you could use

mySprite instanceof Sprite;

Note that this operator is also in ActionScript but it shouldn't be used there anymore:

The is operator, which is new for ActionScript 3.0, allows you to test whether a variable or expression is a member of a given data type. In previous versions of ActionScript, the instanceof operator provided this functionality, but in ActionScript 3.0 the instanceof operator should not be used to test for data type membership. The is operator should be used instead of the instanceof operator for manual type checking, because the expression x instanceof y merely checks the prototype chain of x for the existence of y (and in ActionScript 3.0, the prototype chain does not provide a complete picture of the inheritance hierarchy).

TypeScript's instanceof shares the same problems. As it is a language which is still in its development I recommend you to state a proposal of such facility.

FlutterError: Unable to load asset

I had the same error when trying to add an image to a module inside a larger project turns out the Image.asset widget takes a packages parameter that you can specify, after specifying it worked just fine

How to create an instance of System.IO.Stream stream

System.IO.Stream stream = new System.IO.MemoryStream();

UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in range(128)

Add line below at the beginning of your script ( or as second line):

# -*- coding: utf-8 -*-

That's definition of python source code encoding. More info in PEP 263.

How do I configure php to enable pdo and include mysqli on CentOS?

You might just have to install the packages.

yum install php-pdo php-mysqli

After they're installed, restart Apache.

httpd restart

apachectl restart

How to create EditText accepts Alphabets only in android?

Put code edittext xml file,

   android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

How to get the focused element with jQuery?

// Get the focused element:
var $focused = $(':focus');

// No jQuery:
var focused = document.activeElement;

// Does the element have focus:
var hasFocus = $('foo').is(':focus');

// No jQuery:
elem === elem.ownerDocument.activeElement;

Which one should you use? quoting the jQuery docs:

As with other pseudo-class selectors (those that begin with a ":"), it is recommended to precede :focus with a tag name or some other selector; otherwise, the universal selector ("*") is implied. In other words, the bare $(':focus') is equivalent to $('*:focus'). If you are looking for the currently focused element, $( document.activeElement ) will retrieve it without having to search the whole DOM tree.

The answer is:

document.activeElement

And if you want a jQuery object wrapping the element:

$(document.activeElement)

post ajax data to PHP and return data

 $.ajax({
            type: "POST",
            data: {data:the_id},
            url: "http://localhost/test/index.php/data/count_votes",
            success: function(data){
               //data will contain the vote count echoed by the controller i.e.  
                 "yourVoteCount"
              //then append the result where ever you want like
              $("span#votes_number").html(data); //data will be containing the vote count which you have echoed from the controller

                }
            });

in the controller

$data = $_POST['data'];  //$data will contain the_id
//do some processing
echo "yourVoteCount";

Clarification

i think you are confusing

{data:the_id}

with

success:function(data){

both the data are different for your own clarity sake you can modify it as

success:function(vote_count){
$(span#someId).html(vote_count);

How can I check if char* variable points to empty string?

Give it a chance:

Try getting string via function gets(string) then check condition as if(string[0] == '\0')

error: (-215) !empty() in function detectMultiScale

Please do not copy paste the content of xml file, because once you paste it to notepad it will be saved a s text file. So directly download the file from the given source.

Simple example of threading in C++

#include <thread>
#include <iostream>
#include <vector>
using namespace std;

void doSomething(int id) {
    cout << id << "\n";
}

/**
 * Spawns n threads
 */
void spawnThreads(int n)
{
    std::vector<thread> threads(n);
    // spawn n threads:
    for (int i = 0; i < n; i++) {
        threads[i] = thread(doSomething, i + 1);
    }

    for (auto& th : threads) {
        th.join();
    }
}

int main()
{
    spawnThreads(10);
}

WPF loading spinner

use an enum type to indicate your ViewModel's State

public enum ViewModeType
{
    Default, 
    Busy
    //etc.
}

then in your ViewModels Base class use a property

public ViewModeType ViewMode
{
    get { return this.viewMode; }
    set
    {
        if (this.viewMode != value)
        {
            this.viewMode = value;
                            //You should notify property changed here
        }
    }
}

and in view trigger the ViewMode and if it is busy show busyindicator:

<Trigger Property="ViewMode" Value="Busy">
    <!-- Show BusyIndicator -->
</Trigger>

Is there any standard for JSON API response format?

For what it's worth I do this differently. A successful call just has the JSON objects. I don't need a higher level JSON object that contains a success field indicating true and a payload field that has the JSON object. I just return the appropriate JSON object with a 200 or whatever is appropriate in the 200 range for the HTTP status in the header.

However, if there is an error (something in the 400 family) I return a well-formed JSON error object. For example, if the client is POSTing a User with an email address and phone number and one of these is malformed (i.e. I cannot insert it into my underlying database) I will return something like this:

{
  "description" : "Validation Failed"
  "errors" : [ {
    "field" : "phoneNumber",
    "message" : "Invalid phone number."
  } ],
}

Important bits here are that the "field" property must match the JSON field exactly that could not be validated. This allows clients to know exactly what went wrong with their request. Also, "message" is in the locale of the request. If both the "emailAddress" and "phoneNumber" were invalid then the "errors" array would contain entries for both. A 409 (Conflict) JSON response body might look like this:

{
  "description" : "Already Exists"
  "errors" : [ {
    "field" : "phoneNumber",
    "message" : "Phone number already exists for another user."
  } ],
}

With the HTTP status code and this JSON the client has all they need to respond to errors in a deterministic way and it does not create a new error standard that tries to complete replace HTTP status codes. Note, these only happen for the range of 400 errors. For anything in the 200 range I can just return whatever is appropriate. For me it is often a HAL-like JSON object but that doesn't really matter here.

The one thing I thought about adding was a numeric error code either in the the "errors" array entries or the root of the JSON object itself. But so far we haven't needed it.

Loop through an array of strings in Bash?

Surprised that nobody's posted this yet -- if you need the indices of the elements while you're looping through the array, you can do this:

arr=(foo bar baz)

for i in ${!arr[@]}
do
    echo $i "${arr[i]}"
done

Output:

0 foo
1 bar
2 baz

I find this a lot more elegant than the "traditional" for-loop style (for (( i=0; i<${#arr[@]}; i++ ))).

(${!arr[@]} and $i don't need to be quoted because they're just numbers; some would suggest quoting them anyway, but that's just personal preference.)

How to convert from []byte to int in Go Programming

var bs []byte
value, _ := strconv.ParseInt(string(bs), 10, 64)

How can I round down a number in Javascript?

You can try to use this function if you need to round down to a specific number of decimal places

function roundDown(number, decimals) {
    decimals = decimals || 0;
    return ( Math.floor( number * Math.pow(10, decimals) ) / Math.pow(10, decimals) );
}

examples

alert(roundDown(999.999999)); // 999
alert(roundDown(999.999999, 3)); // 999.999
alert(roundDown(999.999999, -1)); // 990

How to slice a Pandas Data Frame by position?

I can see at least three options:

df[:10]

2. Using head

df.head(10)

For negative values of n, this function returns all rows except the last n rows, equivalent to df[:-n] [Source].

3. Using iloc

df.iloc[:10]

Failed to execute 'atob' on 'Window'

you don't need to pass the entire encoded string to atob method, you need to split the encoded string and pass the required string to atob method

_x000D_

const token= "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJob3NzYW0iLCJUb2tlblR5cGUiOiJCZWFyZXIiLCJyb2xlIjoiQURNSU4iLCJpc0FkbWluIjp0cnVlLCJFbXBsb3llZUlkIjoxLCJleHAiOjE2MTI5NDA2NTksImlhdCI6MTYxMjkzNzA1OX0.8f0EeYbGyxt9hjggYW1vR5hMHFVXL4ZvjTA6XgCCAUnvacx_Dhbu1OGh8v5fCsCxXQnJ8iAIZDIgOAIeE55LUw"
console.log(atob(token.split(".")[1]));

_x000D_

Initializing an Array of Structs in C#

Change const to static readonly and initialise it like this

static readonly MyStruct[] MyArray = new[] {
    new MyStruct { label = "a", id = 1 },
    new MyStruct { label = "b", id = 5 },
    new MyStruct { label = "q", id = 29 }
};

Get ASCII value at input word

A char is actually a numeric datatype - you can add one to an int, for example. It's an unsigned short (16 bits). In that regard you can just cast the output to, say, an int to get the numeric value.

However you need to think a little more about what it is you're asking - not all characters are ASCII values. What output do you expect for â, for example, or ??

Moreover, why do you want this? In this day and age you ought to be thinking about Unicode, not ASCII. If you let people know what your goal is, and how you intend to use this returned value, we can almost certainly let you know of a better way to achieve it.

How to install plugin for Eclipse from .zip

Add to Criffan's answer,

2.for valid Eclipse Plugin .zip file, you have two method to install it (1) auto install

In here when you are trying to install the plugin,sometimes it will give an error like Dialog appears when trying to add plugin

we have to un tick group Items by Category in the details tab.Then it will work well.

set default schema for a sql query

Another way of adding schema dynamically or if you want to change it to something else

DECLARE @schema AS VARCHAR(256) = 'dbo.'
--User can also use SELECT SCHEMA_NAME() to get the default schema name


DECLARE @ID INT

declare @SQL nvarchar(max) = 'EXEC ' + @schema +'spSelectCaseBookingDetails @BookingID = '  + CAST(@ID AS NVARCHAR(10))

No need to cast @ID if it is nvarchar or varchar

execute (@SQL)

Checkout one file from Subversion

If you want to view readme.txt in your repository without checking it out:

$ svn cat http://svn.red-bean.com/repos/test/readme.txt
This is a README file. You should read this.

Tip: If your working copy is out of date (or you have local modifications) and you want to see the HEAD revision of a file in your working copy, svn cat will automatically fetch the HEAD revision when you give it a path:

$ cat foo.c
This file is in my local working copy and has changes that I've made.

$ svn cat foo.c
Latest revision fresh from the repository!

Source

C++ Cout & Cin & System "Ambiguous"

This kind of thing doesn't just magically happen on its own; you changed something! In industry we use version control to make regular savepoints, so when something goes wrong we can trace back the specific changes we made that resulted in that problem.

Since you haven't done that here, we can only really guess. In Visual Studio, Intellisense (the technology that gives you auto-complete dropdowns and those squiggly red lines) works separately from the actual C++ compiler under the bonnet, and sometimes gets things a bit wrong.

In this case I'd ask why you're including both cstdlib and stdlib.h; you should only use one of them, and I recommend the former. They are basically the same header, a C header, but cstdlib puts them in the namespace std in order to "C++-ise" them. In theory, including both wouldn't conflict but, well, this is Microsoft we're talking about. Their C++ toolchain sometimes leaves something to be desired. Any time the Intellisense disagrees with the compiler has to be considered a bug, whichever way you look at it!

Anyway, your use of using namespace std (which I would recommend against, in future) means that std::system from cstdlib now conflicts with system from stdlib.h. I can't explain what's going on with std::cout and std::cin.

Try removing #include <stdlib.h> and see what happens.

If your program is building successfully then you don't need to worry too much about this, but I can imagine the false positives being annoying when you're working in your IDE.

How to programmatically tell if a Bluetooth device is connected?

In my use case I only wanted to see if a Bluetooth headset is connected for a VoIP app. The following solution worked for me:

public static boolean isBluetoothHeadsetConnected() {
    BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    return mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()
            && mBluetoothAdapter.getProfileConnectionState(BluetoothHeadset.HEADSET) == BluetoothHeadset.STATE_CONNECTED;
}

Of course you'll need the Bluetooth permission:

<uses-permission android:name="android.permission.BLUETOOTH" />

Chrome: console.log, console.debug are not working

In my case preserve logs do the trick. I did everything to show the logs, but it goes away. I checked it and it works,

How to run a SQL query on an Excel table?

You can experiment with the native DB driver for Excel in language/platform of your choice. In Java world, you can try with http://code.google.com/p/sqlsheet/ which provides a JDBC driver for working with Excel sheets directly. Similarly, you can get drivers for the DB technology for other platforms.

However, I can guarantee that you will soon hit a wall with the number of features these wrapper libraries provide. Better way will be to use Apache HSSF/POI or similar level of library but it will need more coding effort.

React component not re-rendering on state change

In my case, I was calling this.setState({}) correctly, but I my function wasn't bound to this, so it wasn't working. Adding .bind(this) to the function call or doing this.foo = this.foo.bind(this) in the constructor fixed it.

How to copy directories with spaces in the name

There's no need to add space before closing quote if path doesn't contain trailing backslash, so following command should work:

robocopy "C:\Source Path" "C:\Destination Path" /option1 /option2...

But, following will not work:

robocopy "C:\Source Path\" "C:\Destination Path\" /option1 /option2...

This is due to the escaping issue that is described here:

The \ escape can cause problems with quoted directory paths that contain a trailing backslash because the closing quote " at the end of the line will be escaped \".

How to view the assembly behind the code using Visual C++?

The earlier version of this answer (a "hack" for rextester.com) is mostly redundant now that http://gcc.godbolt.org/ provides CL 19 RC for ARM, x86, and x86-64 (targeting the Windows calling convention, unlike gcc, clang, and icc on that site).

The Godbolt compiler explorer is designed for nicely formatting compiler asm output, removing the "noise" of directives, so I'd highly recommend using it to look at asm for simple functions that take args and return a value (so they won't be optimized away).

For a while, CL was available on http://gcc.beta.godbolt.org/ but not the main site, but now it's on both.

To get MSVC asm output from the http://rextester.com/l/cpp_online_compiler_visual online compiler: Add /FAs to the command line options. Have your program find its own path and work out the path to the .asm and dump it. Or run a disassembler on the .exe.

e.g. http://rextester.com/OKI40941

#include <string>
#include <boost/filesystem.hpp>
#include <Windows.h>

using namespace std;

static string my_exe(void){
    char buf[MAX_PATH];
    DWORD tmp = GetModuleFileNameA( NULL, // self
                                  buf, MAX_PATH);
    return buf;
}

int main() {
    string dircmd = "dir ";
    boost::filesystem::path p( my_exe() );
    //boost::filesystem::path dir = p.parent_path();

    // transform c:\foo\bar\1234\a.exe 
    // into      c:\foo\bar\1234\1234.asm
    p.remove_filename();
    system ( (dircmd + p.string()).c_str() );

    auto subdir = p.end();      // pointing at one-past the end
    subdir--;                   // pointing at the last directory name
    p /= *subdir;               // append the last dir name as a filename
    p.replace_extension(".asm");
    system ( (string("type ") + p.string()).c_str() );
//    std::cout << "Hello, world!\n";
}

... code of functions you want to see the asm for goes here ...

type is the DOS version of cat. I didn't want to include more code that would make it harder to find the functions I wanted to see the asm for. (Although using std::string and boost run counter to those goals! Some C-style string manipulation that makes more assumptions about the string it's processing (and ignores max-length safety / allocation by using a big buffer) on the result of GetModuleFileNameA would be much less total machine code.)

IDK why, but cout << p.string() << endl only shows the basename (i.e. the filename, without the directories), even though printing its length shows it's not just the bare name. (Chromium48 on Ubuntu 15.10). There's probably some backslash-escape processing at some point in cout, or between the program's stdout and the web browser.

How to display a range input slider vertically

_x000D_

.container {_x000D_
    border: 3px solid #eee;_x000D_
    margin: 10px;_x000D_
    padding: 10px;_x000D_
    float: left;_x000D_
    text-align: center;_x000D_
    max-width: 20%_x000D_
}_x000D_
_x000D_
input[type=range].range {_x000D_
    cursor: pointer;_x000D_
    width: 100px !important;_x000D_
    -webkit-appearance: none;_x000D_
    z-index: 200;_x000D_
    width: 50px;_x000D_
    border: 1px solid #e6e6e6;_x000D_
    background-color: #e6e6e6;_x000D_
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#e6e6e6), to(#d2d2d2));_x000D_
    background-image: -webkit-linear-gradient(right, #e6e6e6, #d2d2d2);_x000D_
    background-image: -moz-linear-gradient(right, #e6e6e6, #d2d2d2);_x000D_
    background-image: -ms-linear-gradient(right, #e6e6e6, #d2d2d2);_x000D_
    background-image: -o-linear-gradient(right, #e6e6e6, #d2d2d2)_x000D_
}_x000D_
_x000D_
input[type=range].range:focus {_x000D_
    border: 0 !important;_x000D_
    outline: 0 !important_x000D_
}_x000D_
_x000D_
input[type=range].range::-webkit-slider-thumb {_x000D_
    -webkit-appearance: none;_x000D_
    width: 10px;_x000D_
    height: 10px;_x000D_
    background-color: #555;_x000D_
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(#4ddbff), to(#0cf));_x000D_
    background-image: -webkit-linear-gradient(right, #4ddbff, #0cf);_x000D_
    background-image: -moz-linear-gradient(right, #4ddbff, #0cf);_x000D_
    background-image: -ms-linear-gradient(right, #4ddbff, #0cf);_x000D_
    background-image: -o-linear-gradient(right, #4ddbff, #0cf)_x000D_
}_x000D_
_x000D_
input[type=range].round {_x000D_
    -webkit-border-radius: 20px;_x000D_
    -moz-border-radius: 20px;_x000D_
    border-radius: 20px_x000D_
}_x000D_
_x000D_
input[type=range].round::-webkit-slider-thumb {_x000D_
    -webkit-border-radius: 5px;_x000D_
    -moz-border-radius: 5px;_x000D_
    -o-border-radius: 5px_x000D_
}_x000D_
_x000D_
.vertical-lowest-first {_x000D_
    -webkit-transform: rotate(90deg);_x000D_
    -moz-transform: rotate(90deg);_x000D_
    -o-transform: rotate(90deg);_x000D_
    -ms-transform: rotate(90deg);_x000D_
    transform: rotate(90deg)_x000D_
}_x000D_
_x000D_
.vertical-heighest-first {_x000D_
    -webkit-transform: rotate(270deg);_x000D_
    -moz-transform: rotate(270deg);_x000D_
    -o-transform: rotate(270deg);_x000D_
    -ms-transform: rotate(270deg);_x000D_
    transform: rotate(270deg)_x000D_
}

_x000D_

<div class="container" style="margin-left: 0px">_x000D_
    <br><br>_x000D_
    <input class="range vertical-lowest-first" type="range" min="0" max="1" step="0.1" value="1">_x000D_
    <br><br><br>_x000D_
</div>_x000D_
_x000D_
<div class="container">_x000D_
    <br><br>_x000D_
    <input class="range vertical-heighest-first" type="range" min="0" max="1" step="0.1" value="1">_x000D_
    <br><br><br>_x000D_
</div>_x000D_
_x000D_
_x000D_
<div class="container">_x000D_
    <br><br>_x000D_
    <input class="range vertical-lowest-first round" type="range" min="0" max="1" step="0.1" value="1">_x000D_
    <br><br><br>_x000D_
</div>_x000D_
_x000D_
_x000D_
<div class="container" style="margin-right: 0px">_x000D_
    <br><br>_x000D_
    <input class="range vertical-heighest-first round" type="range" min="0" max="1" step="0.1" value="1">_x000D_
    <br><br><br>_x000D_
</div>

_x000D_

Source: http://twiggle-web-design.com/tutorials/Custom-Vertical-Input-Range-CSS3.html

Clone Object without reference javascript

If you use an = statement to assign a value to a var with an object on the right side, javascript will not copy but reference the object.

You can use lodash's clone method

var obj = {a: 25, b: 50, c: 75};
var A = _.clone(obj);

Or lodash's cloneDeep method if your object has multiple object levels

var obj = {a: 25, b: {a: 1, b: 2}, c: 75};
var A = _.cloneDeep(obj);

Or lodash's merge method if you mean to extend the source object

var obj = {a: 25, b: {a: 1, b: 2}, c: 75};
var A = _.merge({}, obj, {newkey: "newvalue"});

Or you can use jQuerys extend method:

var obj = {a: 25, b: 50, c: 75};
var A = $.extend(true,{},obj);

Here is jQuery 1.11 extend method's source code :

jQuery.extend = jQuery.fn.extend = function() {
    var src, copyIsArray, copy, name, options, clone,
        target = arguments[0] || {},
        i = 1,
        length = arguments.length,
        deep = false;

    // Handle a deep copy situation
    if ( typeof target === "boolean" ) {
        deep = target;

        // skip the boolean and the target
        target = arguments[ i ] || {};
        i++;
    }

    // Handle case when target is a string or something (possible in deep copy)
    if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
        target = {};
    }

    // extend jQuery itself if only one argument is passed
    if ( i === length ) {
        target = this;
        i--;
    }

    for ( ; i < length; i++ ) {
        // Only deal with non-null/undefined values
        if ( (options = arguments[ i ]) != null ) {
            // Extend the base object
            for ( name in options ) {
                src = target[ name ];
                copy = options[ name ];

                // Prevent never-ending loop
                if ( target === copy ) {
                    continue;
                }

                // Recurse if we're merging plain objects or arrays
                if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
                    if ( copyIsArray ) {
                        copyIsArray = false;
                        clone = src && jQuery.isArray(src) ? src : [];

                    } else {
                        clone = src && jQuery.isPlainObject(src) ? src : {};
                    }

                    // Never move original objects, clone them
                    target[ name ] = jQuery.extend( deep, clone, copy );

                // Don't bring in undefined values
                } else if ( copy !== undefined ) {
                    target[ name ] = copy;
                }
            }
        }
    }

    // Return the modified object
    return target;
};

Check if array is empty or null

As long as your selector is actually working, I see nothing wrong with your code that checks the length of the array. That should do what you want. There are a lot of ways to clean up your code to be simpler and more readable. Here's a cleaned up version with notes about what I cleaned up.

var album_text = [];

$("input[name='album_text[]']").each(function() {
    var value = $(this).val();
    if (value) {
        album_text.push(value);
    }
});
if (album_text.length === 0) {
    $('#error_message').html("Error");
}

else {
  //send data
}

Some notes on what you were doing and what I changed.

$(this) is always a valid jQuery object so there's no reason to ever check if ($(this)). It may not have any DOM objects inside it, but you can check that with $(this).length if you need to, but that is not necessary here because the .each() loop wouldn't run if there were no items so $(this) inside your .each() loop will always be something.
It's inefficient to use $(this) multiple times in the same function. Much better to get it once into a local variable and then use it from that local variable.
It's recommended to initialize arrays with [] rather than new Array().
if (value) when value is expected to be a string will both protect from value == null, value == undefined and value == "" so you don't have to do if (value && (value != "")). You can just do: if (value) to check for all three empty conditions.
if (album_text.length === 0) will tell you if the array is empty as long as it is a valid, initialized array (which it is here).

What are you trying to do with this selector $("input[name='album_text[]']")?

Reverse order of foreach list items

You can use usort function to create own sorting rules

Numpy - Replace a number with NaN

A[A==NDV]=numpy.nan

A==NDV will produce a boolean array that can be used as an index for A

Adding three months to a date in PHP

I assume by "didn't work" you mean that it's giving you a timestamp instead of the formatted date, because you were doing it correctly:

$effectiveDate = strtotime("+3 months", strtotime($effectiveDate)); // returns timestamp
echo date('Y-m-d',$effectiveDate); // formatted version

How to get a particular date format ('dd-MMM-yyyy') in SELECT query SQL Server 2008 R2

select CONVERT(NVARCHAR, SYSDATETIME(), 106) AS [DD-MON-YYYY]

or else

select REPLACE(CONVERT(NVARCHAR,GETDATE(), 106), ' ', '-')

both works fine

Apply CSS rules to a nested class inside a div

You use

#main_text .title {
  /* Properties */
}

If you just put a space between the selectors, styles will apply to all children (and children of children) of the first. So in this case, any child element of #main_text with the class name title. If you use > instead of a space, it will only select the direct child of the element, and not children of children, e.g.:

#main_text > .title {
  /* Properties */
}

Either will work in this case, but the first is more typically used.

jQuery get the rendered height of an element?

I use this to get the height of an element (returns float):

document.getElementById('someDiv').getBoundingClientRect().height

It also works when you use the virtual DOM. I use it in Vue like this:

this.$refs['some-ref'].getBoundingClientRect().height

For a Vue component:

this.$refs['some-ref'].$el.getBoundingClientRect().height

No default constructor found; nested exception is java.lang.NoSuchMethodException with Spring MVC?

You must have to define no-args or default constructor if you are creating your own constructor.

You can read why default or no argument constructor is required.

why-default-or-no-argument-constructor-java-class.html

Open URL in Java to get the content

I found this question while Googling. Note that if you just want to make use of the URI's content via something like a string, consider using Apache's IOUtils.toString() method.

For example, a sample line of code could be:

String pageContent = IOUtils.toString("http://maps.google.at/maps?saddr=4714&daddr=Marchtrenk&hl=de", Charset.UTF_8);

How to calculate a mod b in Python?

I don't think you're fully grasping modulo. a % b and a mod b are just two different ways to express modulo. In this case, python uses %. No, 15 mod 4 is not 1, 15 % 4 == 15 mod 4 == 3.

Negative regex for Perl string pattern match

If my understanding is correct then you want to match any line which has Clinton and Reagan, in any order, but not Bush. As suggested by Stuck, here is a version with lookahead assertions:

#!/usr/bin/perl

use strict;
use warnings;

my $regex = qr/
    (?=.*clinton)  
    (?!.*bush) 
    .*reagan       
    /ix;

while (<DATA>) {
    chomp;
    next unless (/$regex/);
    print $_, "\n";
}


__DATA__
shouldn't match - reagan came first, then clinton, finally bush
first match - first two: reagan and clinton
second match - first two reverse: clinton and reagan
shouldn't match - last two: clinton and bush
shouldn't match - reverse: bush and clinton
shouldn't match - and then came obama, along comes mary
shouldn't match - to clinton with perl

Results

first match - first two: reagan and clinton
second match - first two reverse: clinton and reagan

as desired it matches any line which has Reagan and Clinton in any order.

You may want to try reading how lookahead assertions work with examples at http://www252.pair.com/comdog/mastering_perl/Chapters/02.advanced_regular_expressions.html

they are very tasty :)

How to use SearchView in Toolbar Android

Implementing the SearchView without the use of the menu.xml file and open through button

In your Activity we need to use the method of the onCreateOptionsMenumethod in which we will programmatically inflate the SearchView

private MenuItem searchMenu;
private String mSearchString="";

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        SearchManager searchManager = (SearchManager) StoreActivity.this.getSystemService(Context.SEARCH_SERVICE);


        SearchView mSearchView = new SearchView(getSupportActionBar().getThemedContext());
        mSearchView.setQueryHint(getString(R.string.prompt_search)); /// YOUR HINT MESSAGE
        mSearchView.setMaxWidth(Integer.MAX_VALUE);

        searchMenu = menu.add("searchMenu").setVisible(false).setActionView(mSearchView);
        searchMenu.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW);


        assert searchManager != null;
        mSearchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
        mSearchView.setIconifiedByDefault(false);

        SearchView.OnQueryTextListener queryTextListener = new SearchView.OnQueryTextListener() {
            public boolean onQueryTextChange(String newText) {
                mSearchString = newText;

                return true;
            }

            public boolean onQueryTextSubmit(String query) {
                mSearchString = query;

                searchMenu.collapseActionView();


                return true;
            }
        };

        mSearchView.setOnQueryTextListener(queryTextListener);


        return true;
    }

And in your Activity class, you can open the SearchView on any button click on toolbar like below

YOUR_BUTTON.setOnClickListener(view -> {

            searchMenu.expandActionView();

        });

Remove URL parameters without refreshing page

Better solution :

window.history.pushState(null, null, window.location.pathname);

Android - Set text to TextView

This should do the trick:

TextView.setText("test");

In JPA 2, using a CriteriaQuery, how to count results

You can also use Projections:

ProjectionList projection = Projections.projectionList();
projection.add(Projections.rowCount());
criteria.setProjection(projection);

Long totalRows = (Long) criteria.list().get(0);

Learning Regular Expressions

The most important part is the concepts. Once you understand how the building blocks work, differences in syntax amount to little more than mild dialects. A layer on top of your regular expression engine's syntax is the syntax of the programming language you're using. Languages such as Perl remove most of this complication, but you'll have to keep in mind other considerations if you're using regular expressions in a C program.

If you think of regular expressions as building blocks that you can mix and match as you please, it helps you learn how to write and debug your own patterns but also how to understand patterns written by others.

Start simple

Conceptually, the simplest regular expressions are literal characters. The pattern N matches the character 'N'.

Regular expressions next to each other match sequences. For example, the pattern Nick matches the sequence 'N' followed by 'i' followed by 'c' followed by 'k'.

If you've ever used grep on Unix—even if only to search for ordinary looking strings—you've already been using regular expressions! (The re in grep refers to regular expressions.)

Order from the menu

Adding just a little complexity, you can match either 'Nick' or 'nick' with the pattern [Nn]ick. The part in square brackets is a character class, which means it matches exactly one of the enclosed characters. You can also use ranges in character classes, so [a-c] matches either 'a' or 'b' or 'c'.

The pattern . is special: rather than matching a literal dot only, it matches any character^†. It's the same conceptually as the really big character class [-.?+%$A-Za-z0-9...].

Think of character classes as menus: pick just one.

Helpful shortcuts

Using . can save you lots of typing, and there are other shortcuts for common patterns. Say you want to match a digit: one way to write that is [0-9]. Digits are a frequent match target, so you could instead use the shortcut \d. Others are \s (whitespace) and \w (word characters: alphanumerics or underscore).

The uppercased variants are their complements, so \S matches any non-whitespace character, for example.

Once is not enough

From there, you can repeat parts of your pattern with quantifiers. For example, the pattern ab?c matches 'abc' or 'ac' because the ? quantifier makes the subpattern it modifies optional. Other quantifiers are

* (zero or more times)
+ (one or more times)
{n} (exactly n times)
{n,} (at least n times)
{n,m} (at least n times but no more than m times)

Putting some of these blocks together, the pattern [Nn]*ick matches all of

ick
Nick
nick
Nnick
nNick
nnick
(and so on)

The first match demonstrates an important lesson: * always succeeds! Any pattern can match zero times.

A few other useful examples:

[0-9]+ (and its equivalent \d+) matches any non-negative integer
\d{4}-\d{2}-\d{2} matches dates formatted like 2019-01-01

Grouping

A quantifier modifies the pattern to its immediate left. You might expect 0abc+0 to match '0abc0', '0abcabc0', and so forth, but the pattern immediately to the left of the plus quantifier is c. This means 0abc+0 matches '0abc0', '0abcc0', '0abccc0', and so on.

To match one or more sequences of 'abc' with zeros on the ends, use 0(abc)+0. The parentheses denote a subpattern that can be quantified as a unit. It's also common for regular expression engines to save or "capture" the portion of the input text that matches a parenthesized group. Extracting bits this way is much more flexible and less error-prone than counting indices and substr.

Alternation

Earlier, we saw one way to match either 'Nick' or 'nick'. Another is with alternation as in Nick|nick. Remember that alternation includes everything to its left and everything to its right. Use grouping parentheses to limit the scope of |, e.g., (Nick|nick).

For another example, you could equivalently write [a-c] as a|b|c, but this is likely to be suboptimal because many implementations assume alternatives will have lengths greater than 1.

Escaping

Although some characters match themselves, others have special meanings. The pattern \d+ doesn't match backslash followed by lowercase D followed by a plus sign: to get that, we'd use \\d\+. A backslash removes the special meaning from the following character.

Greediness

Regular expression quantifiers are greedy. This means they match as much text as they possibly can while allowing the entire pattern to match successfully.

For example, say the input is

"Hello," she said, "How are you?"

You might expect ".+" to match only 'Hello,' and will then be surprised when you see that it matched from 'Hello' all the way through 'you?'.

To switch from greedy to what you might think of as cautious, add an extra ? to the quantifier. Now you understand how $(.+?)$, the example from your question works. It matches the sequence of a literal left-parenthesis, followed by one or more characters, and terminated by a right-parenthesis.

If your input is '(123) (456)', then the first capture will be '123'. Non-greedy quantifiers want to allow the rest of the pattern to start matching as soon as possible.

(As to your confusion, I don't know of any regular-expression dialect where ((.+?)) would do the same thing. I suspect something got lost in transmission somewhere along the way.)

Anchors

Use the special pattern ^ to match only at the beginning of your input and $ to match only at the end. Making "bookends" with your patterns where you say, "I know what's at the front and back, but give me everything between" is a useful technique.

Say you want to match comments of the form

-- This is a comment --

you'd write ^--\s+(.+)\s+--$.

Build your own

Regular expressions are recursive, so now that you understand these basic rules, you can combine them however you like.

Tools for writing and debugging regexes:

RegExr (for JavaScript)
Perl: YAPE: Regex Explain
Regex Coach (engine backed by CL-PPCRE)
RegexPal (for JavaScript)
Regular Expressions Online Tester
Regex Buddy
Regex 101 (for PCRE, JavaScript, Python, Golang)
Visual RegExp
Expresso (for .NET)
Rubular (for Ruby)
Regular Expression Library (Predefined Regexes for common scenarios)
Txt2RE
Regex Tester (for JavaScript)
Regex Storm (for .NET)
Debuggex (visual regex tester and helper)

Books

Mastering Regular Expressions, the 2nd Edition, and the 3rd edition.
Regular Expressions Cheat Sheet
Regex Cookbook
Teach Yourself Regular Expressions

Free resources

Footnote

†: The statement above that . matches any character is a simplification for pedagogical purposes that is not strictly true. Dot matches any character except newline, "\n", but in practice you rarely expect a pattern such as .+ to cross a newline boundary. Perl regexes have a /s switch and Java Pattern.DOTALL, for example, to make . match any character at all. For languages that don't have such a feature, you can use something like [\s\S] to match "any whitespace or any non-whitespace", in other words anything.

Multiple Forms or Multiple Submits in a Page?

Best practice: one form per product is definitely the way to go.

Benefits:

It will save you the hassle of having to parse the data to figure out which product was clicked
It will reduce the size of data being posted

In your specific situation

If you only ever intend to have one form element, in this case a submit button, one form for all should work just fine.

My recommendation Do one form per product, and change your markup to something like:

<form method="post" action="">
    <input type="hidden" name="product_id" value="123">
    <button type="submit" name="action" value="add_to_cart">Add to Cart</button>
</form>

This will give you a much cleaner and usable POST. No parsing. And it will allow you to add more parameters in the future (size, color, quantity, etc).

Note: There's no technical benefit to using <button> vs. <input>, but as a programmer I find it cooler to work with action=='add_to_cart' than action=='Add to Cart'. Besides, I hate mixing presentation with logic. If one day you decide that it makes more sense for the button to say "Add" or if you want to use different languages, you could do so freely without having to worry about your back-end code.

How to start/stop/restart a thread in Java?

Once a thread stops you cannot restart it. However, there is nothing stopping you from creating and starting a new thread.

Option 1: Create a new thread rather than trying to restart.

Option 2: Instead of letting the thread stop, have it wait and then when it receives notification you can allow it to do work again. This way the thread never stops and will never need to be restarted.

Edit based on comment:

To "kill" the thread you can do something like the following.

yourThread.setIsTerminating(true); // tell the thread to stop
yourThread.join(); // wait for the thread to stop

How do I create a MongoDB dump of my database?

use "path" for windows else it gives the error as: positional arguments not allowed

Why do I have to define LD_LIBRARY_PATH with an export every time I run my application?

You can just put this all on one line:

LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/path/to/library" ./sync_test

Should make things a little easier, even if it doesn't change anything fundamental

Convert spark DataFrame column to python list

Let's create the dataframe in question

df_test = spark.createDataFrame(
    [
        (1, 5),
        (2, 9),
        (3, 3),
        (4, 1),
    ],
    ['mvv', 'count']
)
df_test.show()

Which gives

+---+-----+
|mvv|count|
+---+-----+
|  1|    5|
|  2|    9|
|  3|    3|
|  4|    1|
+---+-----+

and then apply rdd.flatMap(f).collect() to get the list

test_list = df_test.select("mvv").rdd.flatMap(list).collect()
print(type(test_list))
print(test_list)

which gives

<type 'list'>
[1, 2, 3, 4]

Change the project theme in Android Studio?

Note : This answer is now out-of-date. This changes the theme in "preview" only as @imjohnking and @john-ktejik pointed out. As @Shahzeb mentioned, theme can modified in res>values>styles

Android Studio 0.8.2 provides a slightly easier way to change the theme. In the preview window, you can select the theme of "Holo.Light.DarkActionBar" by clicking on the theme combo box just above the phone. enter image description here

Or do a ctrl + click on the @style/AppTheme in the Android manifest file. It will open styles.xml file where you can change the parent attribute of the style tag.

Theme.Holo for a "dark" theme.
Theme.Holo.Light for a "light" theme.

When using the Support Library, you must instead use the Theme.AppCompat themes:

Theme.AppCompat for the "dark" theme.
Theme.AppCompat.Light for the "light" theme.
Theme.AppCompat.Light.DarkActionBar for the light theme with a dark action bar.

Source http://forums.udacity.com/questions/100200635/choosing-theme-in-android-studio-08x

The Network Adapter could not establish the connection when connecting with Oracle DB

I had similar problem before. But this was resolved when I started using hostname instead of IP address in my connection string.

How to implement custom JsonConverter in JSON.NET to deserialize a List of base class objects?

Using the standard CustomCreationConverter, I was struggling to work how to generate the correct type (Person or Employee), because in order to determine this you need to analyse the JSON and there is no built in way to do this using the Create method.

I found a discussion thread pertaining to type conversion and it turned out to provide the answer. Here is a link: Type converting.

What's required is to subclass JsonConverter, overriding the ReadJson method and creating a new abstract Create method which accepts a JObject.

The JObject class provides a means to load a JSON object and provides access to the data within this object.

The overridden ReadJson method creates a JObject and invokes the Create method (implemented by our derived converter class), passing in the JObject instance.

This JObject instance can then be analysed to determine the correct type by checking existence of certain fields.

Example

string json = "[{
        \"Department\": \"Department1\",
        \"JobTitle\": \"JobTitle1\",
        \"FirstName\": \"FirstName1\",
        \"LastName\": \"LastName1\"
    },{
        \"Department\": \"Department2\",
        \"JobTitle\": \"JobTitle2\",
        \"FirstName\": \"FirstName2\",
        \"LastName\": \"LastName2\"
    },
        {\"Skill\": \"Painter\",
        \"FirstName\": \"FirstName3\",
        \"LastName\": \"LastName3\"
    }]";

List<Person> persons = 
    JsonConvert.DeserializeObject<List<Person>>(json, new PersonConverter());

...

public class PersonConverter : JsonCreationConverter<Person>
{
    protected override Person Create(Type objectType, JObject jObject)
    {
        if (FieldExists("Skill", jObject))
        {
            return new Artist();
        }
        else if (FieldExists("Department", jObject))
        {
            return new Employee();
        }
        else
        {
            return new Person();
        }
    }

    private bool FieldExists(string fieldName, JObject jObject)
    {
        return jObject[fieldName] != null;
    }
}

public abstract class JsonCreationConverter<T> : JsonConverter
{
    /// <summary>
    /// Create an instance of objectType, based properties in the JSON object
    /// </summary>
    /// <param name="objectType">type of object expected</param>
    /// <param name="jObject">
    /// contents of JSON object that will be deserialized
    /// </param>
    /// <returns></returns>
    protected abstract T Create(Type objectType, JObject jObject);

    public override bool CanConvert(Type objectType)
    {
        return typeof(T).IsAssignableFrom(objectType);
    }

    public override bool CanWrite
    {
        get { return false; }
    }

    public override object ReadJson(JsonReader reader, 
                                    Type objectType, 
                                     object existingValue, 
                                     JsonSerializer serializer)
    {
        // Load JObject from stream
        JObject jObject = JObject.Load(reader);

        // Create target object based on JObject
        T target = Create(objectType, jObject);

        // Populate the object properties
        serializer.Populate(jObject.CreateReader(), target);

        return target;
    }
}

Inject service in app.config

Easiest way: $injector = angular.element(document.body).injector()

Then use that to run invoke() or get()

How to call javascript from a href?

another way is :

<a href="javascript:void(0);" onclick="alert('testing')">

Mongoose, Select a specific field with find

DB Data

[
  {
    "_id": "70001",
    "name": "peter"
  },
  {
    "_id": "70002",
    "name": "john"
  },
  {
    "_id": "70003",
    "name": "joseph"
  }
]

Query

db.collection.find({},
{
  "_id": 0,
  "name": 1
}).exec((Result)=>{
    console.log(Result);
})

Output:

[
  {
    "name": "peter"
  },
  {
    "name": "john"
  },
  {
    "name": "joseph"
  }
]

Working sample playground

link

Assign result of dynamic sql to variable

You should try this while getting SEQUENCE value in a variable from the dynamic table.

DECLARE @temp table (#temp varchar (MAX));
DECLARE @SeqID nvarchar(150);
DECLARE @Name varchar(150); 

SET @Name = (Select Name from table)
SET @SeqID = 'SELECT NEXT VALUE FOR '+ @Name + '_Sequence'
insert @temp exec (@SeqID)

SET @SeqID = (select * from @temp )
PRINT @SeqID

Result:

(1 row(s) affected)
 1

Why can't a text column have a default value in MySQL?

I normally run sites on Linux, but I also develop on a local Windows machine. I've run into this problem many times and just fixed the tables when I encountered the problems. I installed an app yesterday to help someone out and of course ran into the problem again. So, I decided it was time to figure out what was going on - and found this thread. I really don't like the idea of changing the sql_mode of the server to an earlier mode (by default), so I came up with a simple (me thinks) solution.

This solution would of course require developers to wrap their table creation scripts to compensate for the MySQL issue running on Windows. You'll see similar concepts in dump files. One BIG caveat is that this could/will cause problems if partitioning is used.

// Store the current sql_mode
mysql_query("set @orig_mode = @@global.sql_mode");

// Set sql_mode to one that won't trigger errors...
mysql_query('set @@global.sql_mode = "MYSQL40"');

/**
 * Do table creations here...
 */

// Change it back to original sql_mode
mysql_query('set @@global.sql_mode = @orig_mode');

That's about it.

java get file size efficiently

From GHad's benchmark, there are a few issue people have mentioned:

1>Like BalusC mentioned: stream.available() is flowed in this case.

Because available() returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.

So 1st to remove the URL this approach.

2>As StuartH mentioned - the order the test run also make the cache difference, so take that out by run the test separately.

Now start test:

When CHANNEL one run alone:

CHANNEL sum: 59691, per Iteration: 238.764

When LENGTH one run alone:

LENGTH sum: 48268, per Iteration: 193.072

So looks like the LENGTH one is the winner here:

@Override
public long getResult() throws Exception {
    File me = new File(FileSizeBench.class.getResource(
            "FileSizeBench.class").getFile());
    return me.length();
}

Check if instance is of a type

c.getType() == typeOf(TForm)

How to change href attribute using JavaScript after opening the link in a new window?

Is there any downside of leveraging mousedown listener to modify the href attribute with a new URL location and then let the browser figures out where it should redirect to?

It's working fine so far for me. Would like to know what the limitations are with this approach?

// Simple code snippet to demonstrate the said approach
const a = document.createElement('a');
a.textContent = 'test link';
a.href = '/haha';
a.target = '_blank';
a.rel = 'noopener';

a.onmousedown = () => {
  a.href = '/lol';
};

document.body.appendChild(a);
}

Common sources of unterminated string literal

You might try running the script through JSLint.

Is this the proper way to do boolean test in SQL?

I personally prefer using char(1) with values 'Y' and 'N' for databases that don't have a native type for boolean. Letters are more user frendly than numbers which assume that those reading it will now that 1 corresponds to true and 0 corresponds to false.

'Y' and 'N' also maps nicely when using (N)Hibernate.

C++, How to determine if a Windows Process is running?

You can use GetExitCodeProcess. It will return STILL_ACTIVE (259) if the process is still running (or if it happened to exit with that exit code :( ).

Bootstrap 3, 4 and 5 .container-fluid with grid adding unwanted padding

In the new alpha versions they've introduced utility spacing classes. The structure can then be tweaked if you use them in a clever way.

Spacing utility classes

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-4 col-md-3 pl-0">…</div>
        <div class="col-sm-4 col-md-3">…</div>
        <div class="col-sm-4 col-md-3">…</div>
        <div class="col-sm-4 col-md-3 pr-0">…</div>
    </div>
</div>

pl-0 and pr-0 will remove leading and trailing padding from the columns. One issue left is the embedded rows of a column, as they still have negative margin. In this case:

<div class="col-sm-12 col-md-6 pl-0">
    <div class="row ml-0">
</div>

Version differences

Also note the utility spacing classes were changed since version 4.0.0-alpha.4. Before they were separated by 2 dashes e.g. => p-x-0 and p-l-0 and so on ...

To stay on topic for the version 3: This is what I use on Bootstrap 3 projects and include the compass setup, for this particular spacing utility, into bootstrap-sass (version 3) or bootstrap (version 4.0.0-alpha.3) with double dashes or bootstrap (version 4.0.0-alpha.4 and up) with single dashes.

Also, latest version(s) go up 'till 5 times a ratio (ex: pt-5 padding-top 5) instead of only 3.

Compass

$grid-breakpoints: (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px) !default;

@import "../scss/mixins/breakpoints"; // media-breakpoint-up, breakpoint-infix
@import "../scss/utilities/_spacing.scss";

CSS output

You can ofcourse always copy/paste the padding spacing classes only from a generated css file.

.p-0 { padding: 0 !important; }
.pt-0 { padding-top: 0 !important; }
.pr-0 { padding-right: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.pl-0 { padding-left: 0 !important; }
.px-0 { padding-right: 0 !important; padding-left: 0 !important; }
.py-0 { padding-top: 0 !important; padding-bottom: 0 !important; }
.p-1 { padding: 0.25rem !important; }
.pt-1 { padding-top: 0.25rem !important; }
.pr-1 { padding-right: 0.25rem !important; }
.pb-1 { padding-bottom: 0.25rem !important; }
.pl-1 { padding-left: 0.25rem !important; }
.px-1 { padding-right: 0.25rem !important; padding-left: 0.25rem !important; }
.py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.pt-2 { padding-top: 0.5rem !important; }
.pr-2 { padding-right: 0.5rem !important; }
.pb-2 { padding-bottom: 0.5rem !important; }
.pl-2 { padding-left: 0.5rem !important; }
.px-2 { padding-right: 0.5rem !important; padding-left: 0.5rem !important; }
.py-2 { padding-top: 0.5rem !important; padding-bottom: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.pt-3 { padding-top: 1rem !important; }
.pr-3 { padding-right: 1rem !important; }
.pb-3 { padding-bottom: 1rem !important; }
.pl-3 { padding-left: 1rem !important; }
.px-3 { padding-right: 1rem !important; padding-left: 1rem !important; }
.py-3 { padding-top: 1rem !important; padding-bottom: 1rem !important; }
.p-4 { padding: 1.5rem !important; }
.pt-4 { padding-top: 1.5rem !important; }
.pr-4 { padding-right: 1.5rem !important; }
.pb-4 { padding-bottom: 1.5rem !important; }
.pl-4 { padding-left: 1.5rem !important; }
.px-4 { padding-right: 1.5rem !important; padding-left: 1.5rem !important; }
.py-4 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }
.p-5 { padding: 3rem !important; }
.pt-5 { padding-top: 3rem !important; }
.pr-5 { padding-right: 3rem !important; }
.pb-5 { padding-bottom: 3rem !important; }
.pl-5 { padding-left: 3rem !important; }
.px-5 { padding-right: 3rem !important; padding-left: 3rem !important; }
.py-5 { padding-top: 3rem !important; padding-bottom: 3rem !important; }

How are cookies passed in the HTTP protocol?

Cookies are passed as HTTP headers, both in the request (client -> server), and in the response (server -> client).

Gradle: Could not determine java version from '11.0.2'

As distributionUrl is still pointing to older version, upgrade wrapper using:

gradle wrapper --gradle-version 5.1.1

Note: Use gradle and not gradlew

Automating running command on Linux from Windows using PuTTY

You can create a putty session, and auto load the script on the server, when starting the session:

putty -load "sessionName"

At remote command, point to the remote script.

jquery $.each() for objects

Basically you need to do two loops here. The one you are doing already is iterating each element in the 0th array element.

You have programs: [ {...}, {...} ] so programs[0] is { "name":"zonealarm", "price":"500" } So your loop is just going over that.

You could do an outer loop over the array

$.each(data.programs, function(index) {

    // then loop over the object elements
    $.each(data.programs[index], function(key, value) {
        console.log(key + ": " + value);
    }

}

Difference between natural join and inner join

SQL is not faithful to the relational model in many ways. The result of a SQL query is not a relation because it may have columns with duplicate names, 'anonymous' (unnamed) columns, duplicate rows, nulls, etc. SQL doesn't treat tables as relations because it relies on column ordering etc.

The idea behind NATURAL JOIN in SQL is to make it easier to be more faithful to the relational model. The result of the NATURAL JOIN of two tables will have columns de-duplicated by name, hence no anonymous columns. Similarly, UNION CORRESPONDING and EXCEPT CORRESPONDING are provided to address SQL's dependence on column ordering in the legacy UNION syntax.

However, as with all programming techniques it requires discipline to be useful. One requirement for a successful NATURAL JOIN is consistently named columns, because joins are implied on columns with the same names (it is a shame that the syntax for renaming columns in SQL is verbose but the side effect is to encourage discipline when naming columns in base tables and VIEWs :)

Note a SQL NATURAL JOIN is an equi-join**, however this is no bar to usefulness. Consider that if NATURAL JOIN was the only join type supported in SQL it would still be relationally complete.

While it is indeed true that any NATURAL JOIN may be written using INNER JOIN and projection (SELECT), it is also true that any INNER JOIN may be written using product (CROSS JOIN) and restriction (WHERE); further note that a NATURAL JOIN between tables with no column names in common will give the same result as CROSS JOIN. So if you are only interested in results that are relations (and why ever not?!) then NATURAL JOIN is the only join type you need. Sure, it is true that from a language design perspective shorthands such as INNER JOIN and CROSS JOIN have their value, but also consider that almost any SQL query can be written in 10 syntactically different, but semantically equivalent, ways and this is what makes SQL optimizers so very hard to develop.

Here are some example queries (using the usual parts and suppliers database) that are semantically equivalent:

SELECT *
  FROM S NATURAL JOIN SP;

-- Must disambiguate and 'project away' duplicate SNO attribute
SELECT S.SNO, SNAME, STATUS, CITY, PNO, QTY
  FROM S INNER JOIN SP 
          USING (SNO);                        

-- Alternative projection
SELECT S.*, PNO, QTY
  FROM S INNER JOIN SP 
          ON S.SNO = SP.SNO;

-- Same columns, different order == equivalent?!
SELECT SP.*, S.SNAME, S.STATUS, S.CITY
  FROM S INNER JOIN SP 
      ON S.SNO = SP.SNO;

-- 'Old school'
SELECT S.*, PNO, QTY
  FROM S, SP 
 WHERE S.SNO = SP.SNO;

** Relational natural join is not an equijoin, it is a projection of one. – philipxy

setup android on eclipse but don't know SDK directory

ADT Plugin (UNSUPPORTED)

The Eclipse ADT plugin is no longer supported, as per this announcement in June 2015.

The Eclipse ADT plugin has many known bugs and potential security bugs that will not be fixed.

You should immediately switch to use Android Studio, the official IDE for Android.

For help transitioning your projects, read Migrate to Android Studio.

Get index of element as child relative to parent

Delegate and Live are easy to use but if you won't have any more li:s added dynamically you could use event delagation with normal bind/click as well. There should be some performance gain using this method since the DOM won't have to be monitored for new matching elements. Haven't got any actual numbers but it makes sense :)

$("#wizard").click(function (e) {
    var source = $(e.target);
    if(source.is("li")){
        // alert index of li relative to ul parent
        alert(source.index());
    }
});

You could test it at jsFiddle: http://jsfiddle.net/jimmysv/4Sfdh/1/

Remove Style on Element

Use javascript

But it depends on what you are trying to do. If you just want to change the height and width, I suggest this:

{
document.getElementById('sample_id').style.height = '150px';
document.getElementById('sample_id').style.width = '150px';


}

TO totally remove it, remove the style, and then re-set the color:

getElementById('sample_id').removeAttribute("style");
document.getElementById('sample_id').style.color = 'red';

Of course, no the only question that remains is on which event you want this to happen.

How to set downloading file name in ASP.NET Web API

You need to set the Content-Disposition header on the HttpResponseMessage:

HttpResponseMessage response = new HttpResponseMessage();
response.StatusCode = HttpStatusCode.OK;
response.Content = new StreamContent(result);
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
    FileName = "foo.txt"
};

How do I remove objects from an array in Java?

You can always do:

int i, j;
for (i = j = 0; j < foo.length; ++j)
  if (!"a".equals(foo[j])) foo[i++] = foo[j];
foo = Arrays.copyOf(foo, i);

Difference between id and name attributes in HTML

There is no literal difference between an id and name.

name is identifier and is used in http request sent by browser to server as a variable name associated with data contained in the value attribute of element.

The id on the other hand is a unique identifier for browser, client side and JavaScript.Hence form needs an id while its elements need a name.

id is more specifically used in adding attributes to unique elements.In DOM methods,Id is used in Javascript for referencing the specific element you want your action to take place on.

For example:

<html>
<body>

<h1 id="demo"></h1>

<script>
document.getElementById("demo").innerHTML = "Hello World!";
</script>
</body>
</html>

Same can be achieved by name attribute, but it's preferred to use id in form and name for small form elements like the input tag or select tag.

html cellpadding the left side of a cell

I choose to use both methods. Cellpadding on the table as a fallback in case the inline style doesn't stick and inline style for most clients.

_x000D_

<table cellpadding="5">_x000D_
  <tr>_x000D_
    <td style='padding:5px 10px 5px 5px'>Content</td>_x000D_
    <td style='padding:5px 10px 5px 5px'>Content</td>_x000D_
  </tr>_x000D_
</table>

_x000D_

Most efficient solution for reading CLOB to String, and String to CLOB in Java?

If you really must use only standard libraries, then you just have to expand on Omar's solution a bit. (Apache's IOUtils is basically just a set of convenience methods which saves on a lot of coding)

You are already able to get the input stream through clobObject.getAsciiStream()

You just have to "manually transfer" the characters to the StringWriter:

InputStream in = clobObject.getAsciiStream();
Reader read = new InputStreamReader(in);
StringWriter write = new StringWriter();

int c = -1;
while ((c = read.read()) != -1)
{
    write.write(c);
}
write.flush();
String s = write.toString();

Bear in mind that

If your clob contains more character than would fit a string, this won't work.
Wrap the InputStreamReader and StringWriter with BufferedReader and BufferedWriter respectively for better performance.

check all socket opened in linux OS

/proc/net/tcp -a list of open tcp sockets

/proc/net/udp -a list of open udp sockets

/proc/net/raw -a list all the 'raw' sockets

These are the files, use cat command to view them. For example:

cat /proc/net/tcp

You can also use the lsof command.

lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them.

How to get script of SQL Server data?

SqlPubWiz.exe (for me, it's in C:\Program Files (x86)\Microsoft SQL Server\90\Tools\Publishing\1.2>)

Run it with no arguments for a wizard. Give it arguments to run on commandline.

SqlPubWiz.exe script -C "<ConnectionString>" <OutputFile>

How to copy to clipboard in Vim?

Shift+Ctrl+C if you are in graphical mode of Linux, but first you need to select what you need to copy.

Where and how is the _ViewStart.cshtml layout file linked?

From ScottGu's blog:

Starting with the ASP.NET MVC 3 Beta release, you can now add a file called _ViewStart.cshtml (or _ViewStart.vbhtml for VB) underneath the \Views folder of your project:

The _ViewStart file can be used to define common view code that you want to execute at the start of each View’s rendering. For example, we could write code within our _ViewStart.cshtml file to programmatically set the Layout property for each View to be the SiteLayout.cshtml file by default:

Because this code executes at the start of each View, we no longer need to explicitly set the Layout in any of our individual view files (except if we wanted to override the default value above).

Important: Because the _ViewStart.cshtml allows us to write code, we can optionally make our Layout selection logic richer than just a basic property set. For example: we could vary the Layout template that we use depending on what type of device is accessing the site – and have a phone or tablet optimized layout for those devices, and a desktop optimized layout for PCs/Laptops. Or if we were building a CMS system or common shared app that is used across multiple customers we could select different layouts to use depending on the customer (or their role) when accessing the site.

This enables a lot of UI flexibility. It also allows you to more easily write view logic once, and avoid repeating it in multiple places.

Also see this.

In a more general sense this ability of MVC framework to "know" about _Viewstart.cshtml is called "Coding by convention".

Convention over configuration (also known as coding by convention) is a software design paradigm which seeks to decrease the number of decisions that developers need to make, gaining simplicity, but not necessarily losing flexibility. The phrase essentially means a developer only needs to specify unconventional aspects of the application. For example, if there's a class Sale in the model, the corresponding table in the database is called “sales” by default. It is only if one deviates from this convention, such as calling the table “products_sold”, that one needs to write code regarding these names.

Wikipedia

There's no magic to it. Its just been written into the core codebase of the MVC framework and is therefore something that MVC "knows" about. That why you don't find it in the .config files or elsewhere; it's actually in the MVC code. You can however override to alter or null out these conventions.

Creating a segue programmatically

For controllers that are in the storyboard.

jhilgert00 is this what you were looking for?

-(IBAction)nav_goHome:(id)sender {
UIViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:@"HomeController"];
[self.navigationController pushViewController: myController animated:YES];

}

OR...

[self performSegueWithIdentifier:@"loginMainSegue" sender:self];

Using 'make' on OS X

You will have to install the "Developer Tools" that are provided as optional packages in OS X installation disks.

How to multiply individual elements of a list with a number?

You can use built-in map function:

result = map(lambda x: x * P, S)

or list comprehensions that is a bit more pythonic:

result = [x * P for x in S]

How to play .mp4 video in videoview in android?

In Kotlin you can do as

 val videoView = findViewById<VideoView>(R.id.videoView)

       // If url is from raw
   /* val url = "android.resource://" + packageName
        .toString() + "/" + R.raw.video*/

    // If url is from network
    val url = "http://www.servername.com/projects/projectname/videos/1361439400.mp4"

    val video =
        Uri.parse(url)
    videoView.setVideoURI(video)
    videoView.setOnPreparedListener{
        videoView.start()
    }

What is the difference between the kernel space and the user space?

By Sunil Yadav, on Quora:

The Linux Kernel refers to everything that runs in Kernel mode and is made up of several distinct layers. At the lowest layer, the Kernel interacts with the hardware via the HAL. At the middle level, the UNIX Kernel is divided into 4 distinct areas. The first of the four areas handles character devices, raw and cooked TTY and terminal handling. The second area handles network device drivers, routing protocols and sockets. The third area handles disk device drivers, page and buffer caches, file system, virtual memory, file naming and mapping. The fourth and last area handles process dispatching, scheduling, creation and termination as well as signal handling. Above all this we have the top layer of the Kernel which includes system calls, interrupts and traps. This level serves as the interface to each of the lower level functions. A programmer uses the various system calls and interrupts to interact with the features of the operating system.

Capture keyboardinterrupt in Python without try-except

If someone is in search for a quick minimal solution,

import signal

# The code which crashes program on interruption

signal.signal(signal.SIGINT, call_this_function_if_interrupted)

# The code skipped if interrupted

Could not load file or assembly 'xxx' or one of its dependencies. An attempt was made to load a program with an incorrect format

if while In visual studio with IIS express working and when published failed try this:

How to send UTF-8 email?

You can add header "Content-Type: text/html; charset=UTF-8" to your message body.

$headers = "Content-Type: text/html; charset=UTF-8";

If you use native mail() function $headers array will be the 4th parameter mail($to, $subject, $message, $headers)

If you user PEAR Mail::factory() code will be:

$smtp = Mail::factory('smtp', $params);

$mail = $smtp->send($to, $headers, $body);

Difference between / and /* in servlet mapping url pattern

Perhaps you need to know how urls are mapped too, since I suffered 404 for hours. There are two kinds of handlers handling requests. BeanNameUrlHandlerMapping and SimpleUrlHandlerMapping. When we defined a servlet-mapping, we are using SimpleUrlHandlerMapping. One thing we need to know is these two handlers share a common property called alwaysUseFullPath which defaults to false.

false here means Spring will not use the full path to mapp a url to a controller. What does it mean? It means when you define a servlet-mapping:

<servlet-mapping>
    <servlet-name>viewServlet</servlet-name>
    <url-pattern>/perfix/*</url-pattern>
</servlet-mapping>

the handler will actually use the * part to find the controller. For example, the following controller will face a 404 error when you request it using /perfix/api/feature/doSomething

@Controller()
@RequestMapping("/perfix/api/feature")
public class MyController {
    @RequestMapping(value = "/doSomething", method = RequestMethod.GET) 
    @ResponseBody
    public String doSomething(HttpServletRequest request) {
        ....
    }
}

It is a perfect match, right? But why 404. As mentioned before, default value of alwaysUseFullPath is false, which means in your request, only /api/feature/doSomething is used to find a corresponding Controller, but there is no Controller cares about that path. You need to either change your url to /perfix/perfix/api/feature/doSomething or remove perfix from MyController base @RequestingMapping.

Does Python SciPy need BLAS?

Try using

sudo apt-get install python3-scipy

Invalid application path

I also had this error.

My IIS Website has a Default Website with three (3) application directories below it.

I had each of my 3 application directories configured correctly to use .NET Framework v2.0 in the Application Pools.

Edit Application Pool

However, the Default Website never was configured. I didn't think it was necessary since all of my apps were contained within it.

My IIS Server's default configuration is .NET Framework v4.0, so I changed that to .NET v2.0:

Edit Default App Pool

After I did that, I no longer received the same error message.

Now, I see this:

Result

I hope this information helps others.

How to read xml file contents in jQuery and display in html elements?

Simply you can read XML file as dataType: "xml", it will retuen xml object already parsed. you can use it as jquery object and find anything or loop throw it…etc.

$(document).ready(function(){
   $.ajax({
    type: "GET" ,
    url: "sampleXML.xml" ,
    dataType: "xml" ,
    success: function(xml) {

    //var xmlDoc = $.parseXML( xml );   <------------------this line
    //if single item
    var person = $(xml).find('person').text();  

    //but if it's multible items then loop
    $(xml).find('person').each(function(){
     $("#temp").append('<li>' + $(this).text() + '</li>');  
    }); 
    }       
});
});

jQuery docs for parseXML

How do I implement a callback in PHP?

With PHP 5.3, you can now do this:

function doIt($callback) { $callback(); }

doIt(function() {
    // this will be done
});

Finally a nice way to do it. A great addition to PHP, because callbacks are awesome.

Using numpy to build an array of all combinations of two arrays

itertools.combinations is in general the fastest way to get combinations from a Python container (if you do in fact want combinations, i.e., arrangements WITHOUT repetitions and independent of order; that's not what your code appears to be doing, but I can't tell whether that's because your code is buggy or because you're using the wrong terminology).

If you want something different than combinations perhaps other iterators in itertools, product or permutations, might serve you better. For example, it looks like your code is roughly the same as:

for val in itertools.product(np.arange(0, 1, 0.1), repeat=6):
    print F(val)

All of these iterators yield tuples, not lists or numpy arrays, so if your F is picky about getting specifically a numpy array you'll have to accept the extra overhead of constructing or clearing and re-filling one at each step.

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