Service has zero application (non-infrastructure) endpoints

The endpoint should also have the namespace:

 <endpoint address="uri" binding="wsHttpBinding" contract="Namespace.Interface" />

spring data jpa @query and pageable

I had the same issue - without Pageable method works fine.
When added as method parameter - doesn't work.

After playing with DB console and native query support came up to decision that method works like it should. However, only for upper case letters.
Logic of my application was that all names of entity starts from upper case letters.

Playing a little bit with it. And discover that IgnoreCase at method name do the "magic" and here is working solution:

public interface EmployeeRepository 
                            extends PagingAndSortingRepository<Employee, Integer> {

    Page<Employee> findAllByNameIgnoreCaseStartsWith(String name, Pageable pageable);

}

Where entity looks like:

@Data
@Entity
@Table(name = "tblEmployees")
public class Employee {

    @Id
    @Column(name = "empID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @NotEmpty
    @Size(min = 2, max = 20)
    @Column(name = "empName", length = 25)
    private String name;

    @Column(name = "empActive")
    private Boolean active;

    @ManyToOne
    @JoinColumn(name = "emp_dpID")
    private Department department;
}

Using python map and other functional tools

Here's the solution you're looking for:

>>> foos = [1.0, 2.0, 3.0, 4.0, 5.0]
>>> bars = [1, 2, 3]
>>> [(x, bars) for x in foos]
[(1.0, [1, 2, 3]), (2.0, [1, 2, 3]), (3.0, [1, 2, 3]), (4.0, [1, 2, 3]), (5.0, [
1, 2, 3])]

I'd recommend using a list comprehension (the [(x, bars) for x in foos] part) over using map as it avoids the overhead of a function call on every iteration (which can be very significant). If you're just going to use it in a for loop, you'll get better speeds by using a generator comprehension:

>>> y = ((x, bars) for x in foos)
>>> for z in y:
...     print z
...
(1.0, [1, 2, 3])
(2.0, [1, 2, 3])
(3.0, [1, 2, 3])
(4.0, [1, 2, 3])
(5.0, [1, 2, 3])

The difference is that the generator comprehension is lazily loaded.

UPDATE In response to this comment:

Of course you know, that you don't copy bars, all entries are the same bars list. So if you modify any one of them (including original bars), you modify all of them.

I suppose this is a valid point. There are two solutions to this that I can think of. The most efficient is probably something like this:

tbars = tuple(bars)
[(x, tbars) for x in foos]

Since tuples are immutable, this will prevent bars from being modified through the results of this list comprehension (or generator comprehension if you go that route). If you really need to modify each and every one of the results, you can do this:

from copy import copy
[(x, copy(bars)) for x in foos]

However, this can be a bit expensive both in terms of memory usage and in speed, so I'd recommend against it unless you really need to add to each one of them.

How to change Jquery UI Slider handle

The CSS class that can be changed to add a image to the JQuery slider handle is called ".ui-slider-horizontal .ui-slider-handle".

The following code shows a demo:

<!DOCTYPE html>
<html>
<head>
  <link type="text/css" href="http://jqueryui.com/latest/themes/base/ui.all.css" rel="stylesheet" />
  <script type="text/javascript" src="http://jqueryui.com/latest/jquery-1.3.2.js"></script>
  <script type="text/javascript" src="http://jqueryui.com/latest/ui/ui.core.js"></script>
  <script type="text/javascript" src="http://jqueryui.com/latest/ui/ui.slider.js"></script>
  <style type="text/css">
  .ui-slider-horizontal .ui-state-default {background: white url(http://stackoverflow.com/content/img/so/vote-arrow-down.png) no-repeat scroll 50% 50%;}
  </style>
  <script type="text/javascript">
  $(document).ready(function(){
    $("#slider").slider();
  });
  </script>
</head>
<body>
<div id="slider"></div>
</body>
</html>

I think registering a handle option was the old way of doing it and no longer supported in JQuery-ui 1.7.2?

Button button = findViewById(R.id.button) always resolves to null in Android Studio

The button code should be moved to the PlaceholderFragment() class. There you will call the layout fragment_main.xml in the onCreateView method. Like so

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_main, container, false);
    Button buttonClick = (Button) view.findViewById(R.id.button);
    buttonClick.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            onButtonClick((Button) view);
        }

    });

    return view;
}

How to get the indices list of all NaN value in numpy array?

Since x!=x returns the same boolean array with np.isnan(x) (because np.nan!=np.nan would return True), you could also write:

np.argwhere(x!=x)

However, I still recommend writing np.argwhere(np.isnan(x)) since it is more readable. I just try to provide another way to write the code in this answer.

How to change SmartGit's licensing option after 30 days of commercial use on ubuntu?

new 2021 hack for Mac:

First goto ~/Library/Preferences/SmartGit
Second delete whatever version do you have i have deleted the whole 20.1 version folder
Third open smart git

Unicode (UTF-8) reading and writing to files in Python

Actually, this worked for me for reading a file with UTF-8 encoding in Python 3.2:

import codecs
f = codecs.open('file_name.txt', 'r', 'UTF-8')
for line in f:
    print(line)

How do I get a list of locked users in an Oracle database?

This suits the requirement:

select username, account_status, EXPIRY_DATE from dba_users where 
username='<username>';

Output:

USERNAME        ACCOUNT_STATUS                   EXPIRY_DA
--------------------------------------------------------------------------------
SYSTEM          EXPIRED                          13-NOV-17

How to remove the bottom border of a box with CSS

Just add in: border-bottom: none;

#index-03 {
    position:absolute;
    border: .1px solid #900;
    border-bottom: none;
    left:0px;
    top:102px;
    width:900px;
    height:27px;
}

What is <scope> under <dependency> in pom.xml for?

The <scope> element can take 6 values: compile, provided, runtime, test, system and import.

This scope is used to limit the transitivity of a dependency, and also to affect the classpath used for various build tasks.

compile

This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.

provided

This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime. For example, when building a web application for the Java Enterprise Edition, you would set the dependency on the Servlet API and related Java EE APIs to scope provided because the web container provides those classes. This scope is only available on the compilation and test classpath, and is not transitive.

runtime

This scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath.

test

This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases.

system

This scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository.

import (only available in Maven 2.0.9 or later)

This scope is only used on a dependency of type pom in the section. It indicates that the specified POM should be replaced with the dependencies in that POM's section. Since they are replaced, dependencies with a scope of import do not actually participate in limiting the transitivity of a dependency.

To answer the second part of your question:

How can we use it for running test?

Note that the test scope allows to use dependencies only for the test phase.

Read the documentation for full details.

Getting Date or Time only from a DateTime Object

You can also use DateTime.Now.ToString("yyyy-MM-dd") for the date, and DateTime.Now.ToString("hh:mm:ss") for the time.

UIImageView aspect fit and center

I solved this problem like this.

setImage to UIImageView (with UIViewContentModeScaleAspectFit)
get imageSize (CGSize imageSize = imageView.image.size)
UIImageView resize. [imageView sizeThatFits:imageSize]
move position where you want.

I wanted to put UIView on the top center of UICollectionViewCell. so, I used this function.

- (void)setImageToCenter:(UIImageView *)imageView
{
    CGSize imageSize = imageView.image.size;
    [imageView sizeThatFits:imageSize];
    CGPoint imageViewCenter = imageView.center;
     imageViewCenter.x = CGRectGetMidX(self.contentView.frame);
    [imageView setCenter:imageViewCenter];
}

It works for me.

Clear image on picturebox

I had to add a Refresh() statement after the Image = null to make things work.

Execute stored procedure with an Output parameter?

How about this? It's extremely simplified:

The SPROC below has an output parameter of @ParentProductID
We want to select the value of the output of @ParentProductID into @MyParentProductID which is declared below.

Here's the Code:

declare @MyParentProductID int

exec p_CheckSplitProduct @ProductId = 4077, @ParentProductID =  @MyParentProductID output

select @MyParentProductID

Generic List - moving an item within the list

Simplest way:

list[newIndex] = list[oldIndex];
list.RemoveAt(oldIndex);

EDIT

The question isn't very clear ... Since we don't care where the list[newIndex] item goes I think the simplest way of doing this is as follows (with or without an extension method):

    public static void Move<T>(this List<T> list, int oldIndex, int newIndex)
    {
        T aux = list[newIndex];
        list[newIndex] = list[oldIndex];
        list[oldIndex] = aux;
    }

This solution is the fastest because it doesn't involve list insertions/removals.

Using RegEx in SQL Server

SELECT * from SOME_TABLE where NAME like '%[^A-Z]%'

Or some other expression instead of A-Z

Remove all files in a directory

os.remove will only remove a single file.

In order to remove with wildcards, you'll need to write your own routine that handles this.

There are quite a few suggested approaches listed on this forum page.

How to change values in a tuple?

Well, as Trufa has already shown, there are basically two ways of replacing a tuple's element at a given index. Either convert the tuple to a list, replace the element and convert back, or construct a new tuple by concatenation.

In [1]: def replace_at_index1(tup, ix, val):
   ...:     lst = list(tup)
   ...:     lst[ix] = val
   ...:     return tuple(lst)
   ...:

In [2]: def replace_at_index2(tup, ix, val):
   ...:     return tup[:ix] + (val,) + tup[ix+1:]
   ...:

So, which method is better, that is, faster?

It turns out that for short tuples (on Python 3.3), concatenation is actually faster!

In [3]: d = tuple(range(10))

In [4]: %timeit replace_at_index1(d, 5, 99)
1000000 loops, best of 3: 872 ns per loop

In [5]: %timeit replace_at_index2(d, 5, 99)
1000000 loops, best of 3: 642 ns per loop

Yet if we look at longer tuples, list conversion is the way to go:

In [6]: k = tuple(range(1000))

In [7]: %timeit replace_at_index1(k, 500, 99)
100000 loops, best of 3: 9.08 µs per loop

In [8]: %timeit replace_at_index2(k, 500, 99)
100000 loops, best of 3: 10.1 µs per loop

For very long tuples, list conversion is substantially better!

In [9]: m = tuple(range(1000000))

In [10]: %timeit replace_at_index1(m, 500000, 99)
10 loops, best of 3: 26.6 ms per loop

In [11]: %timeit replace_at_index2(m, 500000, 99)
10 loops, best of 3: 35.9 ms per loop

Also, performance of the concatenation method depends on the index at which we replace the element. For the list method, the index is irrelevant.

In [12]: %timeit replace_at_index1(m, 900000, 99)
10 loops, best of 3: 26.6 ms per loop

In [13]: %timeit replace_at_index2(m, 900000, 99)
10 loops, best of 3: 49.2 ms per loop

So: If your tuple is short, slice and concatenate. If it's long, do the list conversion!

Creating a new DOM element from an HTML string using built-in DOM methods or Prototype

No need for any tweak, you got a native API:

const toNodes = html =>
    new DOMParser().parseFromString(html, 'text/html').body.childNodes[0]

PostgreSQL Error: Relation already exists

You cannot create a table with a name that is identical to an existing table or view in the cluster. To modify an existing table, use ALTER TABLE (link), or to drop all data currently in the table and create an empty table with the desired schema, issue DROP TABLE before CREATE TABLE.

It could be that the sequence you are creating is the culprit. In PostgreSQL, sequences are implemented as a table with a particular set of columns. If you already have the sequence defined, you should probably skip creating it. Unfortunately, there's no equivalent in CREATE SEQUENCE to the IF NOT EXISTS construct available in CREATE TABLE. By the looks of it, you might be creating your schema unconditionally, anyways, so it's reasonable to use

DROP TABLE IF EXISTS csd_relationship;
DROP SEQUENCE IF EXISTS csd_relationship_csd_relationship_id_seq;

before the rest of your schema update; In case it isn't obvious, This will delete all of the data in the csd_relationship table, if there is any

Launching a website via windows commandline

Ok, The Windows 10 BatchFile is done works just like I had hoped. First press the windows key and R. Type mmc and Enter. In File Add SnapIn>Got to a specific Website and add it to the list. Press OK in the tab, and on the left side console root menu double click your site. Once it opens Add it to favourites. That should place it in C:\Users\user\AppData\Roaming\Microsoft\StartMenu\Programs\Windows Administrative Tools. I made a shortcut of this to a folder on the desktop. Right click the Shortcut and view the properties. In the Shortcut tab of the Properties click advanced and check the Run as Administrator. The Start in Location is also on the Shortcuts Tab you can add that to your batch file if you need. The Batch I made is as follows

@echo off
title Manage SiteEnviro
color 0a
:Clock
cls
echo Date:%date% Time:%time%
pause
cls
c:\WINDOWS\System32\netstat
c:\WINDOWS\System32\netstat -an
goto Greeting

:Greeting
cls
echo Open ShellSite
pause
cls
goto Manage SiteEnviro

:Manage SiteEnviro
"C:\Users\user\AppData\Roaming\Microsoft\Start Menu\Programs\Administrative Tools\YourCustomSavedMMC.msc"

You need to make a shortcut when you save this as a bat file and in the properties>shortcuts>advanced enable administrator access, can also set a keybind there and change the icon if you like. I probably did not need :Clock. The netstat commands can change to setting a hosted network or anything you want including nothing. Can Canscade websites in 1 mmc console and have more than 1 favourite added into the batch file.

Why is AJAX returning HTTP status code 0?

Same problem here when using <button onclick="">submit</button>. Then solved by using <input type="button" onclick="">

Python - How to concatenate to a string in a for loop?

That's not how you do it.

>>> ''.join(['first', 'second', 'other'])
'firstsecondother'

is what you want.

If you do it in a for loop, it's going to be inefficient as string "addition"/concatenation doesn't scale well (but of course it's possible):

>>> mylist = ['first', 'second', 'other']
>>> s = ""
>>> for item in mylist:
...    s += item
...
>>> s
'firstsecondother'

Callback when DOM is loaded in react.js

The below is what I came up with to wait for when the DOM is ready before trying to get a class using document.getElementsByClassName. I called this function from the componentDidMount() lifecycle method.

     changeIcon() {
            if (
                document.getElementsByClassName('YOURCLASSNAME')
                    .length > 0 &&
                document.getElementsByClassName('YOURCLASSNAME').length > 0
            ) {
                document.getElementsByClassName(
                    'YOURCLASSNAME'
                )[0].className = 'YOUR-NEW-CLASSNAME';
                document.getElementsByClassName(
                    'YOUR-OTHER-EXISTING-CLASSNAME'
                )[0].style.display = 'block';
            } else {
                setTimeout(this.changeIcon, 500);
            }
     }

HTTP GET in VBS

You haven't at time of writing described what you are going to do with the response or what its content type is. An answer already contains a very basic usage of MSXML2.XMLHTTP (I recommend the more explicit MSXML2.XMLHTTP.3.0 progID) however you may need to do different things with the response, it may not be text.

The XMLHTTP also has a responseBody property which is a byte array version of the reponse and there is a responseStream which is an IStream wrapper for the response.

Note that in a server-side requirement (e.g., VBScript hosted in ASP) you would use MSXML.ServerXMLHTTP.3.0 or WinHttp.WinHttpRequest.5.1 (which has a near identical interface).

Here is an example of using XmlHttp to fetch a PDF file and store it:-

Dim oXMLHTTP
Dim oStream

Set oXMLHTTP = CreateObject("MSXML2.XMLHTTP.3.0")

oXMLHTTP.Open "GET", "http://someserver/folder/file.pdf", False
oXMLHTTP.Send

If oXMLHTTP.Status = 200 Then
    Set oStream = CreateObject("ADODB.Stream")
    oStream.Open
    oStream.Type = 1
    oStream.Write oXMLHTTP.responseBody
    oStream.SaveToFile "c:\somefolder\file.pdf"
    oStream.Close
End If

Find stored procedure by name

You can use this query:

SELECT 
    ROUTINE_CATALOG AS DatabaseName ,
    ROUTINE_SCHEMA AS SchemaName,
    SPECIFIC_NAME AS SPName ,
    ROUTINE_DEFINITION AS SPBody ,
    CREATED AS CreatedDate,
    LAST_ALTERED AS LastModificationDate
FROM INFORMATION_SCHEMA.ROUTINES
WHERE 
    (ROUTINE_DEFINITION LIKE '%%')
    AND 
    (ROUTINE_TYPE='PROCEDURE')
    AND
    (SPECIFIC_NAME LIKE '%AssessmentToolDegreeDel')

As you can see, you can do search inside the body of Stored Procedure also.

What is the correct way to read a serial port using .NET framework?

    using System;
    using System.IO.Ports;
    using System.Threading;

    namespace SerialReadTest
    {
        class SerialRead
        {
            static void Main(string[] args)
            {
        Console.WriteLine("Serial read init");
        SerialPort port = new SerialPort("COM6", 115200, Parity.None, 8, StopBits.One);
        port.Open();
        while(true){
          Console.WriteLine(port.ReadLine());
        }

    }
}
}

Add a custom attribute to a Laravel / Eloquent model on load?

In my subscription model, I need to know the subscription is paused or not. here is how I did it

public function getIsPausedAttribute() {
    $isPaused = false;
    if (!$this->is_active) {
        $isPaused = true;
    }
}

then in the view template,I can use $subscription->is_paused to get the result.

The getIsPausedAttribute is the format to set a custom attribute,

and uses is_paused to get or use the attribute in your view.

Sending data from HTML form to a Python script in Flask

The form tag needs some attributes set:

action: The URL that the form data is sent to on submit. Generate it with url_for. It can be omitted if the same URL handles showing the form and processing the data.
method="post": Submits the data as form data with the POST method. If not given, or explicitly set to get, the data is submitted in the query string (request.args) with the GET method instead.
enctype="multipart/form-data": When the form contains file inputs, it must have this encoding set, otherwise the files will not be uploaded and Flask won't see them.

The input tag needs a name parameter.

Add a view to handle the submitted data, which is in request.form under the same key as the input's name. Any file inputs will be in request.files.

@app.route('/handle_data', methods=['POST'])
def handle_data():
    projectpath = request.form['projectFilepath']
    # your code
    # return a response

Set the form's action to that view's URL using url_for:

<form action="{{ url_for('handle_data') }}" method="post">
    <input type="text" name="projectFilepath">
    <input type="submit">
</form>

Can't install laravel installer via composer

zip extension is missing, You can avoid this error by simple running below command, It will take version by default

sudo apt-get install php-zip

In case you need any specific version, You need to mention a specific version of your php, Suppose I need to install X version of php-zip then the command will be.

sudo apt-get install phpX-zip

Replace X with your required version, In my case, it is X = 7.3

Error message "unreported exception java.io.IOException; must be caught or declared to be thrown"

Exceptions bubble up the stack. If a caller calls a method that throws a checked exception, like IOException, it must also either catch the exception, or itself throw it.

In the case of the first block:

filecontent()
{
    setGUI();
    setRegister();
    showfile();
    setTitle("FileData");
    setVisible(true);
    setSize(300, 300);

    /*
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent we)
            {
                System.exit(0);
            }
        });
    */
}

You would have to include a try catch block:

filecontent()
{
    setGUI();
    setRegister();
    try {
        showfile();
    }
    catch (IOException e) {
        // Do something here
    }
    setTitle("FileData");
    setVisible(true);
    setSize(300, 300);

    /*
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent we)
            {
                System.exit(0);
            }
        });
    */
}

In the case of the second:

public void actionPerformed(ActionEvent ae)
{
    if (ae.getSource() == submit)
    {
        showfile();
    }
}

You cannot throw IOException from this method as its signature is determined by the interface, so you must catch the exception within:

public void actionPerformed(ActionEvent ae)
{
    if(ae.getSource()==submit)
    {
        try {
            showfile();
        }
        catch (IOException e) {
            // Do something here
        }
    }
}

Remember, the showFile() method is throwing the exception; that's what the "throws" keyword indicates that the method may throw that exception. If the showFile() method is throwing, then whatever code calls that method must catch, or themselves throw the exception explicitly by including the same throws IOException addition to the method signature, if it's permitted.

If the method is overriding a method signature defined in an interface or superclass that does not also declare that the method may throw that exception, you cannot declare it to throw an exception.

how to make UITextView height dynamic according to text length?

it's straight forward to do in programatic way. just follow these steps

add an observer to content length of textfield

[yourTextViewObject addObserver:self forKeyPath:@"contentSize" options:(NSKeyValueObservingOptionNew) context:NULL];

implement observer

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
UITextView *tv = object;

    //Center vertical alignment
    CGFloat topCorrect = ([tv bounds].size.height - [tv contentSize].height * [tv zoomScale])/2.0;
    topCorrect = ( topCorrect < 0.0 ? 0.0 : topCorrect );
    tv.contentOffset = (CGPoint){.x = 0, .y = -topCorrect};


    mTextViewHeightConstraint.constant = tv.contentSize.height;

    [UIView animateWithDuration:0.2 animations:^{

        [self.view layoutIfNeeded];
    }];

}

if you want to stop textviewHeight to increase after some time during typing then implement this and set textview delegate to self.

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if(range.length + range.location > textView.text.length)
    {
        return NO;
    }

    NSUInteger newLength = [textView.text length] + [text length] - range.length;

    return (newLength > 100) ? NO : YES;

}

Server returned HTTP response code: 400

Cannot read property 'addEventListener' of null

Add all event listeners when a window loads.Works like a charm no matter where you put script tags.

window.addEventListener("load", startup);

function startup() {

  document.getElementById("el").addEventListener("click", myFunc);
  document.getElementById("el2").addEventListener("input", myFunc);

}

myFunc(){}

ngModel cannot be used to register form controls with a parent formGroup directive

when you write formcontrolname Angular 2 do not accept. You have to write formControlName . it is about uppercase second words.

<input type="number" [(ngModel)]="myObject.name" formcontrolname="nameFormControl"/>

if the error still conitnue try to set form control for all of object(myObject) field.

between start <form> </form> for example: <form [formGroup]="myForm" (ngSubmit)="submitForm(myForm.value)"> set form control for all input field </form>.

Generating UNIQUE Random Numbers within a range

$len = 10;   // total number of numbers
$min = 100;  // minimum
$max = 999;  // maximum
$range = []; // initialize array
foreach (range(0, $len - 1) as $i) {
    while(in_array($num = mt_rand($min, $max), $range));
    $range[] = $num;
}
print_r($range);

I was interested to see how the accepted answer stacks up against mine. It's useful to note, a hybrid of both may be advantageous; in fact a function that conditionally uses one or the other depending on certain values:

# The accepted answer
function randRange1($min, $max, $count)
{
    $numbers = range($min, $max);
    shuffle($numbers);
    return array_slice($numbers, 0, $count);
}

# My answer
function randRange2($min, $max, $count)
{
    $range = array();
    while ($i++ < $count) {
        while(in_array($num = mt_rand($min, $max), $range));
        $range[] = $num;
    }
    return $range;
}

echo 'randRange1: small range, high count' . PHP_EOL;
$time = microtime(true);
randRange1(0, 9999, 5000);
echo (microtime(true) - $time) . PHP_EOL . PHP_EOL;

echo 'randRange2: small range, high count' . PHP_EOL;
$time = microtime(true);
randRange2(0, 9999, 5000);
echo (microtime(true) - $time) . PHP_EOL . PHP_EOL;

echo 'randRange1: high range, small count' . PHP_EOL;
$time = microtime(true);
randRange1(0, 999999, 6);
echo (microtime(true) - $time) . PHP_EOL . PHP_EOL;

echo 'randRange2: high range, small count' . PHP_EOL;
$time = microtime(true);
randRange2(0, 999999, 6);
echo (microtime(true) - $time) . PHP_EOL . PHP_EOL;

The results:

randRange1: small range, high count
0.019910097122192

randRange2: small range, high count
1.5043621063232

randRange1: high range, small count
2.4722430706024

randRange2: high range, small count
0.0001051425933837

If you're using a smaller range and a higher count of returned values, the accepted answer is certainly optimal; however as I had expected, larger ranges and smaller counts will take much longer with the accepted answer, as it must store every possible value in range. You even run the risk of blowing PHP's memory cap. A hybrid that evaluates the ratio between range and count, and conditionally chooses the generator would be the best of both worlds.

make div's height expand with its content

This problem arises when the Child elements of a Parent Div are floated. Here is the Latest Solution of the problem:

In your CSS file write the following class called .clearfix along with the pseudo selector :after

.clearfix:after {
    content: "";
    display: table;
    clear: both;
}

Then, in your HTML, add the .clearfix class to your parent Div. For example:

<div class="clearfix">
    <div></div>
    <div></div>
</div>

It should work always. You can call the class name as .group instead of .clearfix , as it will make the code more semantic. Note that, it is Not necessary to add the dot or even a space in the value of Content between the double quotation "". Also, overflow: auto; might solve the problem but it causes other problems like showing the scroll-bar and is not recommended.

Source: Blog of Lisa Catalano and Chris Coyier

iOS9 getting error “an SSL error has occurred and a secure connection to the server cannot be made”

I was getting below error on playback

finished with error [-1200] Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSErrorFailingURLStringKey=https://remote-abcabc-svc.an.abc.com:1935/abr/_definst_/smil:v2/video/492F2F82592F59EA74ABAA6B9D6E6F42/F6B1BD452132329FBACD32730862CAE0/091EAD80FE9BEDD52A2F33840CA3CBAC.v3.eng.smil/playlist.m3u8, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, _kCFStreamErrorDomainKey=3, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <692A1174-DA1C-4267-9560-9020A79F8458>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <692A1174-DA1C-4267-9560-9020A79F8458>

I made sure that I added entry in exception domains in plist file and NSAllowsArbitraryLoads is set to true and still I was seeing an error.

Then I realized that I am playing URL with https and not http.

I set video url to http and problem solved.

Vim and Ctags tips and tricks

I use vim in macos, and the original ctags doesn't work well, so I download newest and configure make make install it. I install ctgas in /usr/local/bin/ctags(to keep original one)

"taglist
let Tlist_Ctags_Cmd = "/usr/local/bin/ctags"
let Tlist_WinWidth = 50
map <leader>ta :TlistToggle<cr>
map <leader>bta :!/usr/local/bin/ctags -R .<CR>
set tags=tags;/
map <M-j> <C-]>
map <M-k> <C-T>

How to center-justify the last line of text in CSS?

You can also split the element into two via HTML + JS.

HTML:

<div class='justificator'>
Lorem Ipsum is simply dummy text of the printing and typesetting industry. 
Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, 
when an unknown printer took a galley of type and scrambled it to make a 
type specimen book.
</div>

JS:

function justify() {
    // Query for elements search
    let arr = document.querySelectorAll('.justificator');
    for (let current of arr) {
        let oldHeight = current.offsetHeight;
        // Stores cut part
        let buffer = '';

        if (current.innerText.lastIndexOf(' ') >= 0) {
            while (current.offsetHeight == oldHeight) {
                let lastIndex = current.innerText.lastIndexOf(' ');
                buffer = current.innerText.substring(lastIndex) + buffer;
                current.innerText = current.innerText.substring(0, lastIndex);
            }
            let sibling = current.cloneNode(true);
            sibling.innerText = buffer;
            sibling.classList.remove('justificator');
            // Center
            sibling.style['text-align'] = 'center';


            current.style['text-align'] = 'justify';
            // For devices that do support text-align-last
            current.style['text-align-last'] = 'justify';
            // Insert new element after current
            current.parentNode.insertBefore(sibling, current.nextSibling);
        }
    }
}
document.addEventListener("DOMContentLoaded", justify);

Here is an example with div and p tags

_x000D_

function justify() {_x000D_
    // Query for elements search_x000D_
    let arr = document.querySelectorAll('.justificator');_x000D_
    for (let current of arr) {_x000D_
        let oldHeight = current.offsetHeight;_x000D_
        // Stores cut part_x000D_
        let buffer = '';_x000D_
_x000D_
        if (current.innerText.lastIndexOf(' ') >= 0) {_x000D_
            while (current.offsetHeight == oldHeight) {_x000D_
                let lastIndex = current.innerText.lastIndexOf(' ');_x000D_
                buffer = current.innerText.substring(lastIndex) + buffer;_x000D_
                current.innerText = current.innerText.substring(0, lastIndex);_x000D_
            }_x000D_
            let sibling = current.cloneNode(true);_x000D_
            sibling.innerText = buffer;_x000D_
            sibling.classList.remove('justificator');_x000D_
            // Center_x000D_
            sibling.style['text-align'] = 'center';_x000D_
            // For devices that do support text-align-last_x000D_
            current.style['text-align-last'] = 'justify';_x000D_
            current.style['text-align'] = 'justify';_x000D_
            // Insert new element after current_x000D_
            current.parentNode.insertBefore(sibling, current.nextSibling);_x000D_
        }_x000D_
    }_x000D_
}_x000D_
justify();

_x000D_

p.justificator {_x000D_
    margin-bottom: 0px;_x000D_
}_x000D_
p.justificator + p {_x000D_
    margin-top: 0px;_x000D_
}

_x000D_

<div class='justificator'>_x000D_
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum._x000D_
</div>_x000D_
<p class='justificator'>It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum._x000D_
</p><p>Some other text</p>

_x000D_

_x000D_ Disadvantage: doesn't work when page width changes dynamically.

How to convert 2D float numpy array to 2D int numpy array?

Some numpy functions for how to control the rounding: rint, floor,trunc, ceil. depending how u wish to round the floats, up, down, or to the nearest int.

>>> x = np.array([[1.0,2.3],[1.3,2.9]])
>>> x
array([[ 1. ,  2.3],
       [ 1.3,  2.9]])
>>> y = np.trunc(x)
>>> y
array([[ 1.,  2.],
       [ 1.,  2.]])
>>> z = np.ceil(x)
>>> z
array([[ 1.,  3.],
       [ 2.,  3.]])
>>> t = np.floor(x)
>>> t
array([[ 1.,  2.],
       [ 1.,  2.]])
>>> a = np.rint(x)
>>> a
array([[ 1.,  2.],
       [ 1.,  3.]])

To make one of this in to int, or one of the other types in numpy, astype (as answered by BrenBern):

a.astype(int)
array([[1, 2],
       [1, 3]])

>>> y.astype(int)
array([[1, 2],
       [1, 2]])

How to make a simple popup box in Visual C#?

Try this:

string text = "My text that I want to display";
MessageBox.Show(text);

How to remove focus without setting focus to another control?

android:focusableInTouchMode="true"
android:focusable="true"
android:clickable="true"

Add them to your ViewGroup that includes your EditTextView. It works properly to my Constraint Layout. Hope this help

How to remove the arrow from a select element in Firefox

Would you accept minor changes to the html?

Something like putting a div tag containing the select tag.

Take a look.

PostgreSQL: Modify OWNER on all tables simultaneously in PostgreSQL

You can try the following in PostgreSQL 9

DO $$DECLARE r record;
BEGIN
    FOR r IN SELECT tablename FROM pg_tables WHERE schemaname = 'public'
    LOOP
        EXECUTE 'alter table '|| r.tablename ||' owner to newowner;';
    END LOOP;
END$$;

Is it possible to set the equivalent of a src attribute of an img tag in CSS?

You can define 2 images in your HTML code and use display: none; to decide which one will be visible.

Bash tool to get nth line from a file

sed -n '2p' < file.txt

will print 2nd line

sed -n '2011p' < file.txt

2011th line

sed -n '10,33p' < file.txt

line 10 up to line 33

sed -n '1p;3p' < file.txt

1st and 3th line

and so on...

For adding lines with sed, you can check this:

sed: insert a line in a certain position

JAVA_HOME is set to an invalid directory:

I am using using Ubuntu.

Problem for me solved by using sudo in terminal with the command.

How to access a mobile's camera from a web app?

AppMobi HTML5 SDK once promised access to native device functionality - including the camera - from an HTML5-based app, but is no longer Google-owned. Instead, try the HTML5-based answers in this post.

Size of character ('a') in C/C++

In C, the type of a character constant like 'a' is actually an int, with size of 4 (or some other implementation-dependent value). In C++, the type is char, with size of 1. This is one of many small differences between the two languages.

How do I accomplish an if/else in mustache.js?

You can define a helper in the view. However, the conditional logic is somewhat limited. Moxy-Stencil (https://github.com/dcmox/moxyscript-stencil) seems to address this with "parameterized" helpers, eg:

and in the view:

view.isActive = function (path: string){ return path === this.path ? "class='active'" : '' }

WCFTestClient The HTTP request is unauthorized with client authentication scheme 'Anonymous'

Try providing username and password in your client like below

client.ClientCredentials.UserName.UserName = @"Domain\username"; client.ClientCredentials.UserName.Password = "password";

How to set the LDFLAGS in CMakeLists.txt?

It depends a bit on what you want:

A) If you want to specify which libraries to link to, you can use find_library to find libs and then use link_directories and target_link_libraries to.

Of course, it is often worth the effort to write a good find_package script, which nicely adds "imported" libraries with add_library( YourLib IMPORTED ) with correct locations, and platform/build specific pre- and suffixes. You can then simply refer to 'YourLib' and use target_link_libraries.

B) If you wish to specify particular linker-flags, e.g. '-mthreads' or '-Wl,--export-all-symbols' with MinGW-GCC, you can use CMAKE_EXE_LINKER_FLAGS. There are also two similar but undocumented flags for modules, shared or static libraries:

CMAKE_MODULE_LINKER_FLAGS
CMAKE_SHARED_LINKER_FLAGS
CMAKE_STATIC_LINKER_FLAGS

Install .ipa to iPad with or without iTunes

How about iPhone Configuration Utility?

http://support.apple.com/kb/DL1465?viewlocale=en_US&locale=en_US

iPhone Configuration Utility lets you easily create, maintain, encrypt, and install configuration profiles, track and install provisioning profiles and authorized applications, and capture device information including console logs.

Install ipa files using Iphone configuration utility

Update:

Apple Configurator replaces iPhone Configuration Utility. With the the release of iOS 8, iPhone Configuration Utility is no longer supported or available for download. https://itunes.apple.com/gb/app/apple-configurator/id434433123

Best approach to remove time part of datetime in SQL Server

SELECT CAST(CAST(GETDATE() AS DATE) AS DATETIME)

Select from one table where not in another

Expanding on Sjoerd's anti-join, you can also use the easy to understand SELECT WHERE X NOT IN (SELECT) pattern.

SELECT pm.id FROM r2r.partmaster pm
WHERE pm.id NOT IN (SELECT pd.part_num FROM wpsapi4.product_details pd)

Note that you only need to use ` backticks on reserved words, names with spaces and such, not with normal column names.

On MySQL 5+ this kind of query runs pretty fast.
On MySQL 3/4 it's slow.

Make sure you have indexes on the fields in question
You need to have an index on pm.id, pd.part_num.

Determining Referer in PHP

The REFERER is sent by the client's browser as part of the HTTP protocol, and is therefore unreliable indeed. It might not be there, it might be forged, you just can't trust it if it's for security reasons.

If you want to verify if a request is coming from your site, well you can't, but you can verify the user has been to your site and/or is authenticated. Cookies are sent in AJAX requests so you can rely on that.

Tomcat is not running even though JAVA_HOME path is correct

Set Environment Variable ([Windows Key]+[Pause Key], switch to "Advanced", click "Environment Variables", in "System Variables" (lower list), click "New" (or "Edit" if you already have it),

name: JAVA_HOME

value: C:\PROGRA~1\Java\JDK16~1.0_3

for C:\Program Files\Java\jdk1.6.0_32

click "ok",

go to "path" in "system variables",

add ; at the end of the line (unless there is already one there),

add: C:\PROGRA~1\Java\JDK16~1.0_3\bin

click "ok" through all. -- restart your computer (advisable)

Align Bootstrap Navigation to Center

Thank you all for your help, I added this code and it seems it fixed the issue:

.navbar .navbar-nav {
    display: inline-block;
    float: none;
}

.navbar .navbar-collapse {
    text-align: center;
}

Source

Center content in responsive bootstrap navbar

Common HTTPclient and proxy

I had a similar problem with HttpClient version 4.

I couldn't connect to the server because of a SOCKS proxy error and I fixed it using the below configuration:

client.getParams().setParameter("socksProxyHost",proxyHost);
client.getParams().setParameter("socksProxyPort",proxyPort);

How to do encryption using AES in Openssl

I am trying to write a sample program to do AES encryption using Openssl.

This answer is kind of popular, so I'm going to offer something more up-to-date since OpenSSL added some modes of operation that will probably help you.

First, don't use AES_encrypt and AES_decrypt. They are low level and harder to use. Additionally, it's a software-only routine, and it will never use hardware acceleration, like AES-NI. Finally, its subject to endianess issues on some obscure platforms.

Instead, use the EVP_* interfaces. The EVP_* functions use hardware acceleration, like AES-NI, if available. And it does not suffer endianess issues on obscure platforms.

Second, you can use a mode like CBC, but the ciphertext will lack integrity and authenticity assurances. So you usually want a mode like EAX, CCM, or GCM. (Or you manually have to apply a HMAC after the encryption under a separate key.)

Third, OpenSSL has a wiki page that will probably interest you: EVP Authenticated Encryption and Decryption. It uses GCM mode.

Finally, here's the program to encrypt using AES/GCM. The OpenSSL wiki example is based on it.

#include <openssl/evp.h>
#include <openssl/aes.h>
#include <openssl/err.h>
#include <string.h>   

int main(int arc, char *argv[])
{
    OpenSSL_add_all_algorithms();
    ERR_load_crypto_strings();     

    /* Set up the key and iv. Do I need to say to not hard code these in a real application? :-) */

    /* A 256 bit key */
    static const unsigned char key[] = "01234567890123456789012345678901";

    /* A 128 bit IV */
    static const unsigned char iv[] = "0123456789012345";

    /* Message to be encrypted */
    unsigned char plaintext[] = "The quick brown fox jumps over the lazy dog";

    /* Some additional data to be authenticated */
    static const unsigned char aad[] = "Some AAD data";

    /* Buffer for ciphertext. Ensure the buffer is long enough for the
     * ciphertext which may be longer than the plaintext, dependant on the
     * algorithm and mode
     */
    unsigned char ciphertext[128];

    /* Buffer for the decrypted text */
    unsigned char decryptedtext[128];

    /* Buffer for the tag */
    unsigned char tag[16];

    int decryptedtext_len = 0, ciphertext_len = 0;

    /* Encrypt the plaintext */
    ciphertext_len = encrypt(plaintext, strlen(plaintext), aad, strlen(aad), key, iv, ciphertext, tag);

    /* Do something useful with the ciphertext here */
    printf("Ciphertext is:\n");
    BIO_dump_fp(stdout, ciphertext, ciphertext_len);
    printf("Tag is:\n");
    BIO_dump_fp(stdout, tag, 14);

    /* Mess with stuff */
    /* ciphertext[0] ^= 1; */
    /* tag[0] ^= 1; */

    /* Decrypt the ciphertext */
    decryptedtext_len = decrypt(ciphertext, ciphertext_len, aad, strlen(aad), tag, key, iv, decryptedtext);

    if(decryptedtext_len < 0)
    {
        /* Verify error */
        printf("Decrypted text failed to verify\n");
    }
    else
    {
        /* Add a NULL terminator. We are expecting printable text */
        decryptedtext[decryptedtext_len] = '\0';

        /* Show the decrypted text */
        printf("Decrypted text is:\n");
        printf("%s\n", decryptedtext);
    }

    /* Remove error strings */
    ERR_free_strings();

    return 0;
}

void handleErrors(void)
{
    unsigned long errCode;

    printf("An error occurred\n");
    while(errCode = ERR_get_error())
    {
        char *err = ERR_error_string(errCode, NULL);
        printf("%s\n", err);
    }
    abort();
}

int encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *aad,
            int aad_len, unsigned char *key, unsigned char *iv,
            unsigned char *ciphertext, unsigned char *tag)
{
    EVP_CIPHER_CTX *ctx = NULL;
    int len = 0, ciphertext_len = 0;

    /* Create and initialise the context */
    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();

    /* Initialise the encryption operation. */
    if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL))
        handleErrors();

    /* Set IV length if default 12 bytes (96 bits) is not appropriate */
    if(1 != EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL))
        handleErrors();

    /* Initialise key and IV */
    if(1 != EVP_EncryptInit_ex(ctx, NULL, NULL, key, iv)) handleErrors();

    /* Provide any AAD data. This can be called zero or more times as
     * required
     */
    if(aad && aad_len > 0)
    {
        if(1 != EVP_EncryptUpdate(ctx, NULL, &len, aad, aad_len))
            handleErrors();
    }

    /* Provide the message to be encrypted, and obtain the encrypted output.
     * EVP_EncryptUpdate can be called multiple times if necessary
     */
    if(plaintext)
    {
        if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
            handleErrors();

        ciphertext_len = len;
    }

    /* Finalise the encryption. Normally ciphertext bytes may be written at
     * this stage, but this does not occur in GCM mode
     */
    if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len)) handleErrors();
    ciphertext_len += len;

    /* Get the tag */
    if(1 != EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, tag))
        handleErrors();

    /* Clean up */
    EVP_CIPHER_CTX_free(ctx);

    return ciphertext_len;
}

int decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *aad,
            int aad_len, unsigned char *tag, unsigned char *key, unsigned char *iv,
            unsigned char *plaintext)
{
    EVP_CIPHER_CTX *ctx = NULL;
    int len = 0, plaintext_len = 0, ret;

    /* Create and initialise the context */
    if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();

    /* Initialise the decryption operation. */
    if(!EVP_DecryptInit_ex(ctx, EVP_aes_256_gcm(), NULL, NULL, NULL))
        handleErrors();

    /* Set IV length. Not necessary if this is 12 bytes (96 bits) */
    if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, 16, NULL))
        handleErrors();

    /* Initialise key and IV */
    if(!EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv)) handleErrors();

    /* Provide any AAD data. This can be called zero or more times as
     * required
     */
    if(aad && aad_len > 0)
    {
        if(!EVP_DecryptUpdate(ctx, NULL, &len, aad, aad_len))
            handleErrors();
    }

    /* Provide the message to be decrypted, and obtain the plaintext output.
     * EVP_DecryptUpdate can be called multiple times if necessary
     */
    if(ciphertext)
    {
        if(!EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
            handleErrors();

        plaintext_len = len;
    }

    /* Set expected tag value. Works in OpenSSL 1.0.1d and later */
    if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, tag))
        handleErrors();

    /* Finalise the decryption. A positive return value indicates success,
     * anything else is a failure - the plaintext is not trustworthy.
     */
    ret = EVP_DecryptFinal_ex(ctx, plaintext + len, &len);

    /* Clean up */
    EVP_CIPHER_CTX_free(ctx);

    if(ret > 0)
    {
        /* Success */
        plaintext_len += len;
        return plaintext_len;
    }
    else
    {
        /* Verify failed */
        return -1;
    }
}

Uncaught SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>)

Remove this line from your code:

console.info(JSON.parse(scatterSeries));

What's the best strategy for unit-testing database-driven applications?

I'm always running tests against an in-memory DB (HSQLDB or Derby) for these reasons:

It makes you think which data to keep in your test DB and why. Just hauling your production DB into a test system translates to "I have no idea what I'm doing or why and if something breaks, it wasn't me!!" ;)
It makes sure the database can be recreated with little effort in a new place (for example when we need to replicate a bug from production)
It helps enormously with the quality of the DDL files.

The in-memory DB is loaded with fresh data once the tests start and after most tests, I invoke ROLLBACK to keep it stable. ALWAYS keep the data in the test DB stable! If the data changes all the time, you can't test.

The data is loaded from SQL, a template DB or a dump/backup. I prefer dumps if they are in a readable format because I can put them in VCS. If that doesn't work, I use a CSV file or XML. If I have to load enormous amounts of data ... I don't. You never have to load enormous amounts of data :) Not for unit tests. Performance tests are another issue and different rules apply.

How to change value of a request parameter in laravel

Try to:

$requestData = $request->all();
$requestData['img'] = $img;

Another way to do it:

$request->merge(['img' => $img]);

Thanks to @JoelHinz for this.

If you want to add or overwrite nested data:

$data['some']['thing'] = 'value';
$request->merge($data);

If you do not inject Request $request object, you can use the global request() helper or \Request:: facade instead of $request

How to insert a string which contains an "&"

SET SCAN OFF is obsolete http://download-uk.oracle.com/docs/cd/B10501_01/server.920/a90842/apc.htm

Circular gradient in android

Here is the complete xml with gradient, stoke & circular shape.

<?xml version="1.0" encoding="utf-8"?>

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" >

    <!-- You can use gradient with below attributes-->
    <gradient
        android:angle="90"
        android:centerColor="#555994"
        android:endColor="#b5b6d2"
        android:startColor="#555994"
        android:type="linear" />

    <!-- You can omit below tag if you don't need stroke -->
   <stroke android:color="#3b91d7" android:width="5dp"/>

    <!-- Set the same value for both width and height to get a circular shape -->
    <size android:width="200dp" android:height="200dp"/>


    <!--if you need only a single color filled shape-->
    <solid android:color="#e42828"/>


</shape>

Make div (height) occupy parent remaining height

My answer uses only CSS, and it does not use overflow:hidden or display:table-row. It requires that the first child really does have a given height, but in your question you state that only the second child need have its height not specified, so I believe you should find this acceptable.

html

<div id="container">
    <div id="up">Text<br />Text<br />Text<br /></div>
    <div id="down">Text<br />Text<br />Text<br /></div>
</div>

css

#container { width: 300px; height: 300px; border:1px solid red;}
#up { background: green; height: 63px; float:left; width: 100% }
#down { background:pink; padding-top: 63px; height: 100%; box-sizing: border-box; }

http://jsfiddle.net/S8g4E/288/

Is there a way I can capture my iPhone screen as a video?

You can use Lookback. It records your screen, face, voice and all gestures, and uploads them to your account on the web.

Here's a demo: https://lookback.io/watch/JK354d5jcEpA7CNkE

How to find the date of a day of the week from a date using PHP?

PHP Manual said :

w Numeric representation of the day of the week

You can therefore construct a date with mktime, and use in it date("w", $yourTime);

How to run a shell script at startup

Working with Python 3 microservices or shell; using Ubuntu Server 18.04 (Bionic Beaver) or Ubuntu 19.10 (Eoan Ermine) or Ubuntu 18.10 (Cosmic Cuttlefish) I always do like these steps, and it worked always too:

Creating a microservice called p example "brain_microservice1.service" in my case:
```
$ nano /lib/systemd/system/brain_microservice1.service
```

Inside this new service that you are in:

[Unit]
Description=brain_microservice_1
After=multi-user.target

[Service]
Type=simple
ExecStart=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices    /microservice_1.py -k start -DFOREGROUND
ExecStop=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices/microservice_1.py -k graceful-stop
ExecReload=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices/microservice_1.py -k graceful
PrivateTmp=true
LimitNOFILE=infinity
KillMode=mixed
Restart=on-failure
RestartSec=5s

[Install]
WantedBy=multi-user.target

Give the permissions:

$ chmod -X /lib/systemd/system/brain_microservice*
$ chmod -R 775 /lib/systemd/system/brain_microservice*

Give the execution permission then:
```
$ systemctl daemon-reload
```
Enable then, this will make then always start on startup
```
$ systemctl enable brain_microservice1.service
```
Then you can test it;

$ sudo reboot now
Finish = SUCCESS!!

This can be done with the same body script to run shell, react ... database startup script ... any kind os code ... hope this help u...

...

Remove old Fragment from fragment manager

I had the same issue. I came up with a simple solution. Use fragment .replace instead of fragment .add. Replacing fragment doing the same thing as adding fragment and then removing it manually.

getFragmentManager().beginTransaction().replace(fragment).commit();

instead of

getFragmentManager().beginTransaction().add(fragment).commit();

Check if event exists on element

To check for events on an element:

var events = $._data(element, "events")

Note that this will only work with direct event handlers, if you are using $(document).on("event-name", "jq-selector", function() { //logic }), you will want to see the getEvents function at the bottom of this answer

For example:

 var events = $._data(document.getElementById("myElemId"), "events")

 var events = $._data($("#myElemId")[0], "events")

Full Example:

<html>
    <head>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
        <script>
            $(function() {
                $("#textDiv").click(function() {
                    //Event Handling
                });
                var events = $._data(document.getElementById('textDiv'), "events");
                var hasEvents = (events != null);
            });
        </script>
    </head>
    <body>
        <div id="textDiv">Text</div>
    </body>
</html>

A more complete way to check, that includes dynamic listeners, installed with $(document).on

function getEvents(element) {
    var elemEvents = $._data(element, "events");
    var allDocEvnts = $._data(document, "events");
    for(var evntType in allDocEvnts) {
        if(allDocEvnts.hasOwnProperty(evntType)) {
            var evts = allDocEvnts[evntType];
            for(var i = 0; i < evts.length; i++) {
                if($(element).is(evts[i].selector)) {
                    if(elemEvents == null) {
                        elemEvents = {};
                    }
                    if(!elemEvents.hasOwnProperty(evntType)) {
                        elemEvents[evntType] = [];
                    }
                    elemEvents[evntType].push(evts[i]);
                }
            }
        }
    }
    return elemEvents;
}

Example usage:

getEvents($('#myElemId')[0])

Where is Python language used?

Python started as a scripting language for Linux like Perl but less cryptic. Now it is used for both web and desktop applications and is available on Windows too. Desktop GUI APIs like GTK have their Python implementations and Python based web frameworks like Django are preferred by many over PHP et al. for web applications.

And by the way,

What can you do with PHP that you can't do with ASP or JSP?
What can you do with Java that you can't do with C++?

an attempt was made to access a socket in a way forbbiden by its access permissions. why?

Most likely the socket is held by some process. Use netstat -o to find which one.

Android: Quit application when press back button

try this

Intent a = new Intent(Intent.ACTION_MAIN);
a.addCategory(Intent.CATEGORY_HOME);
a.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(a);

How to remove newlines from beginning and end of a string?

For anyone else looking for answer to the question when dealing with different linebreaks:

string.replaceAll("(\n|\r|\r\n)$", ""); // Java 7
string.replaceAll("\\R$", "");          // Java 8

This should remove exactly the last line break and preserve all other whitespace from string and work with Unix (\n), Windows (\r\n) and old Mac (\r) line breaks: https://stackoverflow.com/a/20056634, https://stackoverflow.com/a/49791415. "\\R" is matcher introduced in Java 8 in Pattern class: https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html

This passes these tests:

// Windows:
value = "\r\n test \r\n value \r\n";
assertEquals("\r\n test \r\n value ", value.replaceAll("\\R$", ""));

// Unix:
value = "\n test \n value \n";
assertEquals("\n test \n value ", value.replaceAll("\\R$", ""));

// Old Mac:
value = "\r test \r value \r";
assertEquals("\r test \r value ", value.replaceAll("\\R$", ""));

ComboBox SelectedItem vs SelectedValue

If we want to bind to a dictionary ie

  <ComboBox SelectedValue="{Binding Pathology, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
                              ItemsSource="{x:Static RnxGlobal:CLocalizedEnums.PathologiesValues}" DisplayMemberPath="Value" SelectedValuePath="Key"
                              Margin="{StaticResource SmallMarginLeftBottom}"/>

then SelectedItem will not work whilist SelectedValue will

PHPMailer character encoding issues

Sorry for being late on the party. Depending on your server configuration, You may be required to specify character strictly with lowercase letters utf-8, otherwise it will be ignored. Try this if you end up here searching for solutions and none of answers above helps:

$mail->CharSet = "UTF-8";

should be replaced with:

$mail->CharSet = "utf-8";

vertical alignment of text element in SVG

The alignment-baseline property is what you're looking for it can take the following values

auto | baseline | before-edge | text-before-edge | 
middle | central | after-edge | text-after-edge | 
ideographic | alphabetic | hanging | mathematical | 
inherit

Description from w3c

This property specifies how an object is aligned with respect to its parent. This property specifies which baseline of this element is to be aligned with the corresponding baseline of the parent. For example, this allows alphabetic baselines in Roman text to stay aligned across font size changes. It defaults to the baseline with the same name as the computed value of the alignment-baseline property. That is, the position of "ideographic" alignment-point in the block-progression-direction is the position of the "ideographic" baseline in the baseline-table of the object being aligned.

W3C Source

Unfortunately, although this is the "correct" way of achieving what you're after it would appear Firefox have not implemented a lot of the presentation attributes for the SVG Text Module ('SVG in Firefox' MDN Documentation)

Day Name from Date in JS

Not the best method, use an array instead. This is just an alternative method.

http://www.w3schools.com/jsref/jsref_getday.asp

var date = new Date();
var day = date.getDay();

You should really use google before you post here.

Since other people posted the array method I'll show you an alternative way using a switch statement.

switch(day) {
    case 0:
        day = "Sunday";
        break;
    case 1:
        day = "Monday";
        break;

    ... rest of cases

    default:
        // do something
        break;
}

The above works, however, the array is the better alternative. You may also use if() statements however a switch statement would be much cleaner then several if's.

PHP - concatenate or directly insert variables in string

Either one is fine. Use the one that has better visibility for you. And speaking of visibility you can also check out printf.

Are vectors passed to functions by value or by reference in C++

A vector is functionally same as an array. But, to the language vector is a type, and int is also a type. To a function argument, an array of any type (including vector[]) is treated as pointer. A vector<int> is not same as int[] (to the compiler). vector<int> is non-array, non-reference, and non-pointer - it is being passed by value, and hence it will call copy-constructor.

So, you must use vector<int>& (preferably with const, if function isn't modifying it) to pass it as a reference.

Verifying that a string contains only letters in C#

You can loop on the chars of string and check using the Char Method IsLetter but you can also do a trick using String method IndexOfAny to search other charaters that are not suppose to be in the string.

How do I get a human-readable file size in bytes abbreviation using .NET?

I use the Long extension method below to convert to a human readable size string. This method is the C# implementation of the Java solution of this same question posted on Stack Overflow, here.

/// <summary>
/// Convert a byte count into a human readable size string.
/// </summary>
/// <param name="bytes">The byte count.</param>
/// <param name="si">Whether or not to use SI units.</param>
/// <returns>A human readable size string.</returns>
public static string ToHumanReadableByteCount(
    this long bytes
    , bool si
)
{
    var unit = si
        ? 1000
        : 1024;

    if (bytes < unit)
    {
        return $"{bytes} B";
    }

    var exp = (int) (Math.Log(bytes) / Math.Log(unit));

    return $"{bytes / Math.Pow(unit, exp):F2} " +
           $"{(si ? "kMGTPE" : "KMGTPE")[exp - 1] + (si ? string.Empty : "i")}B";
}

Java :Add scroll into text area

Try adding these two lines to your code. I hope it will work. It worked for me :)

display.setLineWrap(true);
display.setWrapStyleWord(true);

Picture of output is shown below

How to apply color in Markdown?

While Markdown doesn't support color, if you don't need too many, you could always sacrifice some of the supported styles and redefine the related tag using CSS to make it color, and also remove the formatting, or not.

Example:

// resets
s { text-decoration:none; } //strike-through
em { font-style: normal; font-weight: bold; } //italic emphasis


// colors
s { color: green }
em { color: blue }

Then in your markdown text

~~This is green~~
_this is blue_

Difference between Static methods and Instance methods

Static methods, variables belongs to the whole class, not just an object instance. A static method, variable is associated with the class as a whole rather than with specific instances of a class. Each object will share a common copy of the static methods, variables. There is only one copy per class, no matter how many objects are created from it.

Recommended way to embed PDF in HTML?

You can use the relative location of the saved pdf like this:

Example1

<embed src="example.pdf" width="1000" height="800" frameborder="0" allowfullscreen>

Example2

<iframe src="example.pdf" style="width:1000px; height:800px;" frameborder="0" allowfullscreen></iframe>

How do I create a unique constraint that also allows nulls?

You can create an INSTEAD OF trigger to check for specific conditions and error if they are met. Creating an index can be costly on larger tables.

Here's an example:

CREATE TRIGGER PONY.trg_pony_unique_name ON PONY.tbl_pony
 INSTEAD OF INSERT, UPDATE
 AS
BEGIN
 IF EXISTS(
    SELECT TOP (1) 1 
    FROM inserted i
    GROUP BY i.pony_name
    HAVING COUNT(1) > 1     
    ) 
     OR EXISTS(
    SELECT TOP (1) 1 
    FROM PONY.tbl_pony t
    INNER JOIN inserted i
    ON i.pony_name = t.pony_name
    )
    THROW 911911, 'A pony must have a name as unique as s/he is. --PAS', 16;
 ELSE
    INSERT INTO PONY.tbl_pony (pony_name, stable_id, pet_human_id)
    SELECT pony_name, stable_id, pet_human_id
    FROM inserted
 END

How can I get double quotes into a string literal?

Thankfully, with C++11 there is also the more pleasing approach of using raw string literals.

printf("She said \"time flies like an arrow, but fruit flies like a banana\".");

Becomes:

printf(R"(She said "time flies like an arrow, but fruit flies like a banana".)");

With respect to the addition of brackets after the opening quote, and before the closing quote, note that they can be almost any combination of up to 16 characters, helping avoid the situation where the combination is present in the string itself. Specifically:

any member of the basic source character set except: space, the left parenthesis (, the right parenthesis ), the backslash , and the control characters representing horizontal tab, vertical tab, form feed, and newline" (N3936 §2.14.5 [lex.string] grammar) and "at most 16 characters" (§2.14.5/2)

How much clearer it makes this short strings might be debatable, but when used on longer formatted strings like HTML or JSON, it's unquestionably far clearer.

How to create a unique index on a NULL column?

Pretty sure you can't do that, as it violates the purpose of uniques.

However, this person seems to have a decent work around: http://sqlservercodebook.blogspot.com/2008/04/multiple-null-values-in-unique-index-in.html

Rounding float in Ruby

you can use this for rounding to a precison..

//to_f is for float

salary= 2921.9121
puts salary.to_f.round(2) // to 2 decimal place                   

puts salary.to_f.round() // to 3 decimal place

NULL or BLANK fields (ORACLE)

First, you know that "blank" and "null" are two COMPLETELY DIFFERENT THINGS? Correct?

Second: in most programming languages, "" means an "empty string". A zero-length string. No characters in it.

SQL doesn't necessarily work like that. If I define a column "name char(5)", then a "blank" name will be " " (5 spaces).

It sounds like you might want something like this:

select count(*) from my_table where Length(trim(my_column)) = 0;

"Trim()" is one of many Oracle functions you can use in PL/SQL. It's documented here:

http://www.techonthenet.com/oracle/functions/trim.php

'Hope that helps!

Pointer vs. Reference

If you have a parameter where you may need to indicate the absence of a value, it's common practice to make the parameter a pointer value and pass in NULL.

A better solution in most cases (from a safety perspective) is to use boost::optional. This allows you to pass in optional values by reference and also as a return value.

// Sample method using optional as input parameter
void PrintOptional(const boost::optional<std::string>& optional_str)
{
    if (optional_str)
    {
       cout << *optional_str << std::endl;
    }
    else
    {
       cout << "(no string)" << std::endl;
    }
}

// Sample method using optional as return value
boost::optional<int> ReturnOptional(bool return_nothing)
{
    if (return_nothing)
    {
       return boost::optional<int>();
    }

    return boost::optional<int>(42);
}

How to change DataTable columns order

This is based off of "default locale"'s answer but it will remove invalid column names prior to setting ordinal. This is because if you accidentally send an invalid column name then it would fail and if you put a check to prevent it from failing then the index would be wrong since it would skip indices wherever an invalid column name was passed in.

public static class DataTableExtensions
{
    /// <summary>
    /// SetOrdinal of DataTable columns based on the index of the columnNames array. Removes invalid column names first.
    /// </summary>
    /// <param name="table"></param>
    /// <param name="columnNames"></param>
    /// <remarks> http://stackoverflow.com/questions/3757997/how-to-change-datatable-colums-order</remarks>
    public static void SetColumnsOrder(this DataTable dtbl, params String[] columnNames)
    {
        List<string> listColNames = columnNames.ToList();

        //Remove invalid column names.
        foreach (string colName in columnNames)
        {
            if (!dtbl.Columns.Contains(colName))
            {
                listColNames.Remove(colName);
            }
        }

        foreach (string colName in listColNames)
        {
            dtbl.Columns[colName].SetOrdinal(listColNames.IndexOf(colName));
        }
}

Java Timestamp - How can I create a Timestamp with the date 23/09/2007?

According to the API the constructor which would accept year, month, and so on is deprecated. Instead you should use the Constructor which accepts a long. You could use a Calendar implementation to construct the date you want and access the time-representation as a long, for example with the getTimeInMillis method.

Format certain floating dataframe columns into percentage in pandas

As suggested by @linqu you should not change your data for presentation. Since pandas 0.17.1, (conditional) formatting was made easier. Quoting the documentation:

You can apply conditional formatting, the visual styling of a DataFrame depending on the data within, by using the DataFrame.style property. This is a property that returns a pandas.Styler object, which has useful methods for formatting and displaying DataFrames.

For your example, that would be (the usual table will show up in Jupyter):

df.style.format({
    'var1': '{:,.2f}'.format,
    'var2': '{:,.2f}'.format,
    'var3': '{:,.2%}'.format,
})

What is the correct way to restore a deleted file from SVN?

The problem with doing an svn merge as suggested by Sean Bright is that is reintroduces other changes made in the same revision as the deletion. An svn copy is a more targeted operation that will only affect the deleted files.

Using Tortoise SVN you can resurrect a file that has been deleted from your working copy directory and from later SVN revisions, via a svn copy as follows:

Browse to the working copy folder that previously contained the file.
Right click on the folder in Explorer, go to TortoiseSVN -> Show log.
Right click on the revision number just prior to the revision that deleted the file and select "Browse repository".
Right click on the deleted file and select "Copy to working copy..." and save.

The deleted file will now be in the working copy folder. To re-add it back to SVN, right click on the restored file and select SVN Commit.

NB: This method will preserve the previous history of the restored file, however to see the prior history in the TortoiseSVN log you need to make sure "Stop on copy/rename" is unchecked in the Log messages dialog.

Get list from pandas dataframe column or row?

If your column will only have one value something like pd.series.tolist() will produce an error. To guarantee that it will work for all cases, use the code below:

(
    df
        .filter(['column_name'])
        .values
        .reshape(1, -1)
        .ravel()
        .tolist()
)

Difference between F5, Ctrl + F5 and click on refresh button?

I did small research regarding this topic and found different behavior for the browsers:

enter image description here

See my blog post "Behind refresh button" for more details.

Get file size before uploading

Best solution working on all browsers ;)

function GetFileSize(fileid) {
    try {
        var fileSize = 0;
        // for IE
        if(checkIE()) { //we could use this $.browser.msie but since it's deprecated, we'll use this function
            // before making an object of ActiveXObject, 
            // please make sure ActiveX is enabled in your IE browser
            var objFSO = new ActiveXObject("Scripting.FileSystemObject");
            var filePath = $("#" + fileid)[0].value;
            var objFile = objFSO.getFile(filePath);
            var fileSize = objFile.size; //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        // for FF, Safari, Opeara and Others
        else {
            fileSize = $("#" + fileid)[0].files[0].size //size in b
            fileSize = fileSize / 1048576; //size in mb 
        }
        alert("Uploaded File Size is" + fileSize + "MB");
    }
    catch (e) {
        alert("Error is :" + e);
    }
}

from http://www.dotnet-tricks.com/Tutorial/jquery/HHLN180712-Get-file-size-before-upload-using-jquery.html

UPDATE : We'll use this function to check if it's IE browser or not

function checkIE() {
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf("MSIE ");

    if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)){  
        // If Internet Explorer, return version number
        alert(parseInt(ua.substring(msie + 5, ua.indexOf(".", msie))));
    } else {
        // If another browser, return 0
        alert('otherbrowser');
    }

    return false;
}

How to add new column to an dataframe (to the front not end)?

Add column "a"

> df["a"] <- 0
> df
  b c d a
1 1 2 3 0
2 1 2 3 0
3 1 2 3 0

Sort by column using colum name

> df <- df[c('a', 'b', 'c', 'd')]
> df
  a b c d
1 0 1 2 3
2 0 1 2 3
3 0 1 2 3

Or sort by column using index

> df <- df[colnames(df)[c(4,1:3)]]
> df
  a b c d
1 0 1 2 3
2 0 1 2 3
3 0 1 2 3

How to produce a range with step n in bash? (generate a sequence of numbers with increments)

Pure Bash, without an extra process:

for (( COUNTER=0; COUNTER<=10; COUNTER+=2 )); do
    echo $COUNTER
done

retrieve data from db and display it in table in php .. see this code whats wrong with it?

In your while statement just replace mysql_fetch_row with mysql_fetch_array or mysql_fetch_assoc... whichever works...

what is an illegal reflective access

If you want to go with the add-open option, here's a command to find which module provides which package ->

java --list-modules | tr @ " " | awk '{ print $1 }' | xargs -n1 java -d

the name of the module will be shown with the @ while the name of the packages without it

NOTE: tested with JDK 11

IMPORTANT: obviously is better than the provider of the package does not do the illegal access

Syntax error on print with Python 3

Because in Python 3, print statement has been replaced with a print() function, with keyword arguments to replace most of the special syntax of the old print statement. So you have to write it as

print("Hello World")

But if you write this in a program and someone using Python 2.x tries to run it, they will get an error. To avoid this, it is a good practice to import print function:

from __future__ import print_function

Now your code works on both 2.x & 3.x.

Check out below examples also to get familiar with print() function.

Old: print "The answer is", 2*2
New: print("The answer is", 2*2)

Old: print x,           # Trailing comma suppresses newline
New: print(x, end=" ")  # Appends a space instead of a newline

Old: print              # Prints a newline
New: print()            # You must call the function!

Old: print >>sys.stderr, "fatal error"
New: print("fatal error", file=sys.stderr)

Old: print (x, y)       # prints repr((x, y))
New: print((x, y))      # Not the same as print(x, y)!

Source: What’s New In Python 3.0?

How to get a product's image in Magento?

(string)Mage::helper('catalog/image')->init($product, 'image');

this will give you image url, even if image hosted on CDN.

How do you compare structs for equality in C?

C provides no language facilities to do this - you have to do it yourself and compare each structure member by member.

How to get elements with multiple classes

html

<h2 class="example example2">A heading with class="example"</h2>

javascritp code

var element = document.querySelectorAll(".example.example2");
element.style.backgroundColor = "green";

The querySelectorAll() method returns all elements in the document that matches a specified CSS selector(s), as a static NodeList object.

The NodeList object represents a collection of nodes. The nodes can be accessed by index numbers. The index starts at 0.

also learn more about https://www.w3schools.com/jsref/met_document_queryselectorall.asp

== Thank You ==

How to rename with prefix/suffix?

In my case I have a group of files which needs to be renamed before I can work with them. Each file has its own role in group and has its own pattern.

As result I have a list of rename commands like this:

f=`ls *canctn[0-9]*`   ;  mv $f  CNLC.$f
f=`ls *acustb[0-9]*`   ;  mv $f  CATB.$f
f=`ls *accusgtb[0-9]*` ;  mv $f  CATB.$f
f=`ls *acus[0-9]*`     ;  mv $f  CAUS.$f

Try this also :

f=MyFileName; mv $f {pref1,pref2}$f{suf1,suf2}

This will produce all combinations with prefixes and suffixes:

pref1.MyFileName.suf1
...
pref2.MyFileName.suf2

Another way to solve same problem is to create mapping array and add corespondent prefix for each file type as shown below:

#!/bin/bash
unset masks
typeset -A masks
masks[ip[0-9]]=ip
masks[iaf_usg[0-9]]=ip_usg
masks[ipusg[0-9]]=ip_usg
...
for fileMask in ${!masks[*]}; 
do  
registryEntry="${masks[$fileMask]}";
fileName=*${fileMask}*
[ -e ${fileName} ] &&  mv ${fileName} ${registryEntry}.${fileName}  
done

how to change language for DataTable

for Arabic language

 var table = $('#my_table')
                .DataTable({
                 "columns":{//......}
                 "language": 
                        {
                            "sProcessing": "???? ???????...",
                            "sLengthMenu": "???? _MENU_ ??????",
                            "sZeroRecords": "?? ???? ??? ??? ?????",
                            "sInfo": "????? _START_ ??? _END_ ?? ??? _TOTAL_ ????",
                            "sInfoEmpty": "???? 0 ??? 0 ?? ??? 0 ???",
                            "sInfoFiltered": "(?????? ?? ????? _MAX_ ?????)",
                            "sInfoPostFix": "",
                            "sSearch": "????:",
                            "sUrl": "",
                            "oPaginate": {
                                "sFirst": "?????",
                                "sPrevious": "??????",
                                "sNext": "??????",
                                "sLast": "??????"
                            }
                        }
                });

Ref: https://datatables.net/plug-ins/i18n/Arabic

Author: Ossama Khayat

Ajax - 500 Internal Server Error

I fixed an error like this changing the places of the routes in routes.php, for example i had something like this:

Route::resource('Mensajes', 'MensajeriaController');
Route::get('Mensajes/modificar', 'MensajeriaController@modificarEstado');

and then I put it like this:

Route::get('Mensajes/modificar', 'MensajeriaController@modificarEstado');
Route::resource('Mensajes', 'MensajeriaController');

Server Error in '/' Application. ASP.NET

This wont necessarily fix the problem...but it will tell you what the real problem is.
Its currently trying to use a custom error page that doesn't exist.
If you add this line to Web.config (under system.web tag) it should give you the real error.

<system.web>
    <!-- added line -->
    <customErrors mode="Off"/>
    <!-- added  line -->
</system.web>

using batch echo with special characters

Here's one more approach by using SET and FOR /F

@echo off

set "var=<?xml version="1.0" encoding="utf-8" ?>"

for /f "tokens=1* delims==" %%a in ('set var') do echo %%b

and you can beautify it like:

@echo off
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
set "print{[=for /f "tokens=1* delims==" %%a in ('set " & set "]}=') do echo %%b"
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::


set "xml_line.1=<?xml version="1.0" encoding="utf-8" ?>"
set "xml_line.2=<root>"
set "xml_line.3=</root>"

%print{[% xml_line %]}%

textarea character limit

I found a good solution that uses the maxlength attribute if the browser supports it, and falls back to an unobtrusive javascript pollyfill in unsupporting browsers.

Thanks to @Dan Tello's comment I fixed it up so it works in IE7+ as well:

HTML:

<textarea maxlength="50" id="text">This textarea has a character limit of 50.</textarea>

Javascript:

function maxLength(el) {    
    if (!('maxLength' in el)) {
        var max = el.attributes.maxLength.value;
        el.onkeypress = function () {
            if (this.value.length >= max) return false;
        };
    }
}

maxLength(document.getElementById("text"));

Demo

There is no such thing as a minlength attribute in HTML5.
For the following input types: number, range, date, datetime, datetime-local, month, time, and week (which aren't fully supported yet) use the min and max attributes.

How to download videos from youtube on java?

Regarding the format (mp4 or flv) decide which URL you want to use. Then use this tutorial to download the video and save it into a local directory.

<DIV> inside link (<a href="">) tag

I would just format two different a-tags with a { display: block; height: 15px; width: 40px; } . This way you don't even need the div-tags...

Oracle SQL: Use sequence in insert with Select Statement

Assuming that you want to group the data before you generate the key with the sequence, it sounds like you want something like

INSERT INTO HISTORICAL_CAR_STATS (
    HISTORICAL_CAR_STATS_ID, 
    YEAR,
    MONTH, 
    MAKE,
    MODEL,
    REGION,
    AVG_MSRP,
    CNT) 
SELECT MY_SEQ.nextval,
       year,
       month,
       make,
       model,
       region,
       avg_msrp,
       cnt
  FROM (SELECT '2010' year,
               '12' month,
               'ALL' make,
               'ALL' model,
               REGION,
               sum(AVG_MSRP*COUNT)/sum(COUNT) avg_msrp,
               sum(cnt) cnt
          FROM HISTORICAL_CAR_STATS
         WHERE YEAR = '2010' 
           AND MONTH = '12'
           AND MAKE != 'ALL' 
         GROUP BY REGION)

Most pythonic way to delete a file which may not exist

Something like this? Takes advantage of short-circuit evaluation. If the file does not exist, the whole conditional cannot be true, so python will not bother evaluation the second part.

os.path.exists("gogogo.php") and os.remove("gogogo.php")

Vertical Text Direction

rotation, like you did, is the way to go - but note that not all browsers support that. if you wan't to get a cross-browser solution, you'll have to generate pictures for that.

Difference between Hashing a Password and Encrypting it

Hashing algorithms are usually cryptographic in nature, but the principal difference is that encryption is reversible through decryption, and hashing is not.

An encryption function typically takes input and produces encrypted output that is the same, or slightly larger size.

A hashing function takes input and produces a typically smaller output, typically of a fixed size as well.

While it isn't possible to take a hashed result and "dehash" it to get back the original input, you can typically brute-force your way to something that produces the same hash.

In other words, if a authentication scheme takes a password, hashes it, and compares it to a hashed version of the requires password, it might not be required that you actually know the original password, only its hash, and you can brute-force your way to something that will match, even if it's a different password.

Hashing functions are typically created to minimize the chance of collisions and make it hard to just calculate something that will produce the same hash as something else.

ESLint Parsing error: Unexpected token

I solved this issue by First, installing babel-eslint using npm

npm install babel-eslint --save-dev

Secondly, add this configuration in .eslintrc file

{
   "parser":"babel-eslint"
}

Enable the display of line numbers in Visual Studio

For me, line numbers wouldn't appear in the editor until I added the option under both the "all languages" pane, and the language I was working under (C# etc)... screen capture showing editor options

Breaking out of a for loop in Java

break; is what you need to break out of any looping statement like for, while or do-while.

In your case, its going to be like this:-

for(int x = 10; x < 20; x++) {
         // The below condition can be present before or after your sysouts, depending on your needs.
         if(x == 15){
             break; // A unlabeled break is enough. You don't need a labeled break here.
         }
         System.out.print("value of x : " + x );
         System.out.print("\n");
}

Laravel: Get Object From Collection By Attribute

You can use filter, like so:

$desired_object = $food->filter(function($item) {
    return $item->id == 24;
})->first();

filter will also return a Collection, but since you know there will be only one, you can call first on that Collection.

You don't need the filter anymore (or maybe ever, I don't know this is almost 4 years old). You can just use first:

$desired_object = $food->first(function($item) {
    return $item->id == 24;
});

Global keyboard capture in C# application

If a global hotkey would suffice, then RegisterHotKey would do the trick

How to insert default values in SQL table?

CREATE PROC SP_EMPLOYEE                             --By Using TYPE parameter and CASE  in Stored procedure
(@TYPE INT)
AS
BEGIN
IF @TYPE=1
BEGIN
SELECT DESIGID,DESIGNAME FROM GP_DESIGNATION
END
IF @TYPE=2
BEGIN
SELECT ID,NAME,DESIGNAME,
case D.ISACTIVE when 'Y' then 'ISACTIVE' when 'N' then 'INACTIVE' else 'not' end as ACTIVE
 FROM GP_EMPLOYEEDETAILS ED 
  JOIN  GP_DESIGNATION D ON ED.DESIGNATION=D.DESIGID
END
END

WCF ServiceHost access rights

Another solution is to use the address

http://localhost:8732/Design_Time_Addresses/YOUR_ADDRESS .

.NET Framework (3.5) automatically register this address (http://*:8732/Design_Time_Addresses) for debugging scope. This is useful when you need to host services inside visual studio for debugging or testing. Don't use this on production...

Replace part of a string in Python?

You can easily use .replace() as also previously described. But it is also important to keep in mind that strings are immutable. Hence if you do not assign the change you are making to a variable, then you will not see any change. Let me explain by;

    >>stuff = "bin and small"
    >>stuff.replace('and', ',')
    >>print(stuff)
    "big and small" #no change

To observe the change you want to apply, you can assign same or another variable;

    >>stuff = "big and small"
    >>stuff = stuff.replace("and", ",")   
    >>print(stuff)
    'big, small'

When to use Spring Security`s antMatcher()?

I'm updating my answer...

antMatcher() is a method of HttpSecurity, it doesn't have anything to do with authorizeRequests(). Basically, http.antMatcher() tells Spring to only configure HttpSecurity if the path matches this pattern.

The authorizeRequests().antMatchers() is then used to apply authorization to one or more paths you specify in antMatchers(). Such as permitAll() or hasRole('USER3'). These only get applied if the first http.antMatcher() is matched.

How to get IntPtr from byte[] in C#

Here's a twist on @user65157's answer (+1 for that, BTW):

I created an IDisposable wrapper for the pinned object:

class AutoPinner : IDisposable
{
   GCHandle _pinnedArray;
   public AutoPinner(Object obj)
   {
      _pinnedArray = GCHandle.Alloc(obj, GCHandleType.Pinned);
   }
   public static implicit operator IntPtr(AutoPinner ap)
   {
      return ap._pinnedArray.AddrOfPinnedObject(); 
   }
   public void Dispose()
   {
      _pinnedArray.Free();
   }
}

then use it like thusly:

using (AutoPinner ap = new AutoPinner(MyManagedObject))
{
   UnmanagedIntPtr = ap;  // Use the operator to retrieve the IntPtr
   //do your stuff
}

I found this to be a nice way of not forgetting to call Free() :)

How to create a circular ImageView in Android?

I too needed a rounded ImageView, I used the below code, you can modify it accordingly:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RoundedImageView extends ImageView {

    public RoundedImageView(Context context) {
        super(context);
    }

    public RoundedImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();

        if (drawable == null) {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

        int w = getWidth();
        @SuppressWarnings("unused")
        int h = getHeight();

        Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;

        if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
            float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
            float factor = smallest / radius;
            sbmp = Bitmap.createScaledBitmap(bmp,
                    (int) (bmp.getWidth() / factor),
                    (int) (bmp.getHeight() / factor), false);
        } else {
            sbmp = bmp;
        }

        Bitmap output = Bitmap.createBitmap(radius, radius, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final String color = "#BAB399";
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, radius, radius);

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor(color));
        canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f,
                radius / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(sbmp, rect, rect, paint);

        return output;
    }

}

How do I use the CONCAT function in SQL Server 2008 R2?

Yes the function is not in sql 2008. You can use the cast operation to do that.

For example we have employee table and you want name with applydate.

so you can use

Select   cast(name as varchar) + cast(applydate as varchar) from employee

It will work where concat function is not working.

Adding delay between execution of two following lines

[checked 27 Nov 2020 and confirmed to be still accurate with Xcode 12.1]

The most convenient way these days: Xcode provides a code snippet to do this where you just have to enter the delay value and the code you wish to run after the delay.

click on the + button at the top right of Xcode.
search for after
It will return only 1 search result, which is the desired snippet (see screenshot). Double click it and you're good to go.

How to export database schema in Oracle to a dump file

It depends on which version of Oracle? Older versions require exp (export), newer versions use expdp (data pump); exp was deprecated but still works most of the time.

Before starting, note that Data Pump exports to the server-side Oracle "directory", which is an Oracle symbolic location mapped in the database to a physical location. There may be a default directory (DATA_PUMP_DIR), check by querying DBA_DIRECTORIES:

  SQL> select * from dba_directories;

... and if not, create one

  SQL> create directory DATA_PUMP_DIR as '/oracle/dumps';
  SQL> grant all on directory DATA_PUMP_DIR to myuser;    -- DBAs dont need this grant

Assuming you can connect as the SYSTEM user, or another DBA, you can export any schema like so, to the default directory:

 $ expdp system/manager schemas=user1 dumpfile=user1.dpdmp

Or specifying a specific directory, add directory=<directory name>:

 C:\> expdp system/manager schemas=user1 dumpfile=user1.dpdmp directory=DUMPDIR

With older export utility, you can export to your working directory, and even on a client machine that is remote from the server, using:

 $ exp system/manager owner=user1 file=user1.dmp

Make sure the export is done in the correct charset. If you haven't setup your environment, the Oracle client charset may not match the DB charset, and Oracle will do charset conversion, which may not be what you want. You'll see a warning, if so, then you'll want to repeat the export after setting NLS_LANG environment variable so the client charset matches the database charset. This will cause Oracle to skip charset conversion.

Example for American UTF8 (UNIX):

 $ export NLS_LANG=AMERICAN_AMERICA.AL32UTF8

Windows uses SET, example using Japanese UTF8:

 C:\> set NLS_LANG=Japanese_Japan.AL32UTF8

More info on Data Pump here: http://docs.oracle.com/cd/B28359_01/server.111/b28319/dp_export.htm#g1022624

When do I need to use a semicolon vs a slash in Oracle SQL?

From my understanding, all the SQL statement don't need forward slash as they will run automatically at the end of semicolons, including DDL, DML, DCL and TCL statements.

For other PL/SQL blocks, including Procedures, Functions, Packages and Triggers, because they are multiple line programs, Oracle need a way to know when to run the block, so we have to write a forward slash at the end of each block to let Oracle run it.

numpy max vs amax vs maximum

You've already stated why np.maximum is different - it returns an array that is the element-wise maximum between two arrays.

As for np.amax and np.max: they both call the same function - np.max is just an alias for np.amax, and they compute the maximum of all elements in an array, or along an axis of an array.

In [1]: import numpy as np

In [2]: np.amax
Out[2]: <function numpy.core.fromnumeric.amax>

In [3]: np.max
Out[3]: <function numpy.core.fromnumeric.amax>

ls command: how can I get a recursive full-path listing, one line per file?

@ghostdog74: Little tweak with your solution.
Following code can be used to search file with its full absolute path.

sudo ls -R / | awk '<br/>
/:$/&&f{s=$0;f=0}<br/>
/:$/&&!f{sub(/:$/,"");s=$0;f=1;next}<br/>
NF&&f{ print s"/"$0 }' | grep [file_to_search]

JavaScript OR (||) variable assignment explanation

It will evaluate X and, if X is not null, the empty string, or 0 (logical false), then it will assign it to z. If X is null, the empty string, or 0 (logical false), then it will assign y to z.

var x = '';
var y = 'bob';
var z = x || y;
alert(z);

Will output 'bob';

How to scale images to screen size in Pygame

If you scale 1600x900 to 1280x720 you have

scale_x = 1280.0/1600
scale_y = 720.0/900

Then you can use it to find button size, and button position

button_width  = 300 * scale_x
button_height = 300 * scale_y

button_x = 1440 * scale_x
button_y = 860  * scale_y

If you scale 1280x720 to 1600x900 you have

scale_x = 1600.0/1280
scale_y = 900.0/720

and rest is the same.

I add .0 to value to make float - otherwise scale_x, scale_y will be rounded to integer - in this example to 0 (zero) (Python 2.x)

python global name 'self' is not defined

self is the self-reference in a Class. Your code is not in a class, you only have functions defined. You have to wrap your methods in a class, like below. To use the method main(), you first have to instantiate an object of your class and call the function on the object.

Further, your function setavalue should be in __init___, the method called when instantiating an object. The next step you probably should look at is supplying the name as an argument to init, so you can create arbitrarily named objects of the Name class ;)

class Name:
    def __init__(self):
        self.myname = "harry"

    def printaname(self):
        print "Name", self.myname     

    def main(self):
        self.printaname()

if __name__ == "__main__":
    objName = Name()
    objName.main()

Have a look at the Classes chapter of the Python tutorial an at Dive into Python for further references.

css to make bootstrap navbar transparent

Update 2019

Bootstrap 4 - The Navbar is transparent by default

Most of the answers here are misleading because they relate to Bootstrap 3. By default, the Bootstrap 4 Navbar is transparent. Just remember to use navbar-light or navbar-dark so the link colors work against the contrast of the background color...

https://www.codeply.com/go/FTDyj4KZlQ

<nav class="navbar navbar-expand-sm fixed-top navbar-light">
    <div class="container">
        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbar1">
            <span class="navbar-toggler-icon"></span>
        </button>
        <a class="navbar-brand" href="#">Brand</a>
        <div class="collapse navbar-collapse" id="navbar1">
            <ul class="navbar-nav">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Link</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

How to implement a SQL like 'LIKE' operator in java?

Apache Cayanne ORM has an "In memory evaluation"

It may not work for unmapped object, but looks promising:

Expression exp = ExpressionFactory.likeExp("artistName", "A%");   
List startWithA = exp.filterObjects(artists);

How to generate a HTML page dynamically using PHP?

Just in case someone wants to generate/create actual HTML file...

$myFile = "filename.html"; // or .php   
$fh = fopen($myFile, 'w'); // or die("error");  
$stringData = "your html code php code goes here";   
fwrite($fh, $stringData);
fclose($fh);

Enjoy!

How do you import a large MS SQL .sql file?

Hope this help you!

sqlcmd -u UserName -s <ServerName\InstanceName> -i U:\<Path>\script.sql

How can I get a specific field of a csv file?

import csv

def read_cell(x, y):
    with open('file.csv', 'r') as f:
        reader = csv.reader(f)
        y_count = 0
        for n in reader:
            if y_count == y:
                cell = n[x]
                return cell
            y_count += 1

print (read_cell(4, 8))

This example prints cell 4, 8 in Python 3.

How to set background color of an Activity to white programmatically?

To get the root view defined in your xml file, without action bar, you can use this:

View root = ((ViewGroup) findViewById(android.R.id.content)).getChildAt(0);

So, to change color to white:

root.setBackgroundResource(Color.WHITE);

Eclipse - java.lang.ClassNotFoundException

I had tried all of the solutions on this page: refresh project, rebuild, all projects clean, restart Eclipse, re-import (even) the projects, rebuild maven and refresh. Nothing worked. What did work was copying the class to a new name which runs fine -- bizarre but true.

After putting up with this for some time, I just fixed it by:

Via the Run menu
Select Run Configurations
Choose the run configuration that is associated with your unit test.
Removing the entry from the Run Configuration by pressing delete or clicking the red X.

Something must have been screwed up with the cached run configuration.

How to implement if-else statement in XSLT?

The most straight-forward approach is to do a second if-test but with the condition inverted. This technique is shorter, easier on the eyes, and easier to get right than a choose-when-otherwise nested block:

<xsl:variable name="CreatedDate" select="@createDate"/>
     <xsl:variable name="IDAppendedDate" select="2012-01-01" />
     <b>date: <xsl:value-of select="$CreatedDate"/></b> 
     <xsl:if test="$CreatedDate &gt; $IDAppendedDate">
        <h2> mooooooooooooo </h2>
     </xsl:if>
     <xsl:if test="$CreatedDate &lt;= $IDAppendedDate">
        <h2> dooooooooooooo </h2>
     </xsl:if>

Here's a real-world example of the technique being used in the style-sheet for a government website: http://w1.weather.gov/xml/current_obs/latest_ob.xsl

Padding or margin value in pixels as integer using jQuery

This simple function will do it:

$.fn.pixels = function(property) {
    return parseInt(this.css(property).slice(0,-2));
};

Usage:

var padding = $('#myId').pixels('paddingTop');

What is a Sticky Broadcast?

The value of a sticky broadcast is the value that was last broadcast and is currently held in the sticky cache. This is not the value of a broadcast that was received right now. I suppose you can say it is like a browser cookie that you can access at any time. The sticky broadcast is now deprecated, per the docs for sticky broadcast methods (e.g.):

This method was deprecated in API level 21. Sticky broadcasts should not be used. They provide no security (anyone can access them), no protection (anyone can modify them), and many other problems. The recommended pattern is to use a non-sticky broadcast to report that something has changed, with another mechanism for apps to retrieve the current value whenever desired.

How to get the device's IMEI/ESN programmatically in android?

The method getDeviceId() is deprecated. There a new method for this getImei(int)

Check here

Verilog generate/genvar in an always block

for verilog just do

parameter ROWBITS = 4;
reg [ROWBITS-1:0] temp;
always @(posedge sysclk) begin
  temp <= {ROWBITS{1'b0}}; // fill with 0
end

MySql Inner Join with WHERE clause

1. Change the INNER JOIN before the WHERE clause.
2. You have two WHEREs which is not allowed.

Try this:

SELECT table1.f_id FROM table1
  INNER JOIN table2 
     ON (table2.f_id = table1.f_id AND table2.f_type = 'InProcess') 
   WHERE table1.f_com_id = '430' AND table1.f_status = 'Submitted'

VBA Subscript out of range - error 9

Subscript out of Range error occurs when you try to reference an Index for a collection that is invalid.

Most likely, the index in Windows does not actually include .xls. The index for the window should be the same as the name of the workbook displayed in the title bar of Excel.

As a guess, I would try using this:

Windows("Data Sheet - " & ComboBox_Month.Value & " " & TextBox_Year.Value).Activate

Function to calculate R2 (R-squared) in R

You can also use the summary for linear models:

summary(lm(obs ~ mod, data=df))$r.squared

Illegal string offset Warning PHP

Please try this way.... I have tested this code.... It works....

$memcachedConfig = array("host" => "127.0.0.1","port" => "11211");
print_r($memcachedConfig['host']);

Clear the cache in JavaScript

You can also disable browser caching with meta HTML tags just put html tags in the head section to avoid the web page to be cached while you are coding/testing and when you are done you can remove the meta tags.

(in the head section)

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0"/>

Refresh your page after pasting this in the head and should refresh the new javascript code too.

This link will give you other options if you need them http://cristian.sulea.net/blog/disable-browser-caching-with-meta-html-tags/

or you can just create a button like so

<button type="button" onclick="location.reload(true)">Refresh</button>

it refreshes and avoid caching but it will be there on your page till you finish testing, then you can take it off. Fist option is best I thing.

My Routes are Returning a 404, How can I Fix Them?

the simple Commands with automatic loads the dependencies

composer dump-autoload

and still getting that your some important files are missing so go here to see whole procedure

https://codingexpertise.blogspot.com/2018/11/laravel-new.html

Passing $_POST values with cURL

Should work fine.

$data = array('name' => 'Ross', 'php_master' => true);

// You can POST a file by prefixing with an @ (for <input type="file"> fields)
$data['file'] = '@/home/user/world.jpg';

$handle = curl_init($url);
curl_setopt($handle, CURLOPT_POST, true);
curl_setopt($handle, CURLOPT_POSTFIELDS, $data);
curl_exec($handle);
curl_close($handle)

We have two options here, CURLOPT_POST which turns HTTP POST on, and CURLOPT_POSTFIELDS which contains an array of our post data to submit. This can be used to submit data to POST <form>s.

It is important to note that curl_setopt($handle, CURLOPT_POSTFIELDS, $data); takes the $data in two formats, and that this determines how the post data will be encoded.

$data as an array(): The data will be sent as multipart/form-data which is not always accepted by the server.

$data = array('name' => 'Ross', 'php_master' => true);
curl_setopt($handle, CURLOPT_POSTFIELDS, $data);

$data as url encoded string: The data will be sent as application/x-www-form-urlencoded, which is the default encoding for submitted html form data.
```
$data = array('name' => 'Ross', 'php_master' => true);
curl_setopt($handle, CURLOPT_POSTFIELDS, http_build_query($data));
```

I hope this will help others save their time.

See:

Fastest way to flatten / un-flatten nested JSON objects

Here is some code I wrote to flatten an object I was working with. It creates a new class that takes every nested field and brings it into the first layer. You could modify it to unflatten by remembering the original placement of the keys. It also assumes the keys are unique even across nested objects. Hope it helps.

class JSONFlattener {
    ojson = {}
    flattenedjson = {}

    constructor(original_json) {
        this.ojson = original_json
        this.flattenedjson = {}
        this.flatten()
    }

    flatten() {
        Object.keys(this.ojson).forEach(function(key){
            if (this.ojson[key] == null) {

            } else if (this.ojson[key].constructor == ({}).constructor) {
                this.combine(new JSONFlattener(this.ojson[key]).returnJSON())
            } else {
                this.flattenedjson[key] = this.ojson[key]
            }
        }, this)        
    }

    combine(new_json) {
        //assumes new_json is a flat array
        Object.keys(new_json).forEach(function(key){
            if (!this.flattenedjson.hasOwnProperty(key)) {
                this.flattenedjson[key] = new_json[key]
            } else {
                console.log(key+" is a duplicate key")
            }
        }, this)
    }

    returnJSON() {
        return this.flattenedjson
    }
}

console.log(new JSONFlattener(dad_dictionary).returnJSON())

As an example, it converts

nested_json = {
    "a": {
        "b": {
            "c": {
                "d": {
                    "a": 0
                }
            }
        }
    },
    "z": {
        "b":1
    },
    "d": {
        "c": {
            "c": 2
        }
    }
}

into

{ a: 0, b: 1, c: 2 }

Convert tabs to spaces in Notepad++

Settings > Preferences > Tab Settings Check the "replace by space". Notice above it there is Tab size: 4 Click on the four and a window will open with the option to change the value to another integer.

Put in your desired integer and press the ENTER key.

There you have it <3.

Deprecation warning in Moment.js - Not in a recognized ISO format

Check out all their awesome documentation!

Here is where they discuss the Warning Message.

String + Format

Warning: Browser support for parsing strings is inconsistent. Because there is no specification on which formats should be supported, what works in some browsers will not work in other browsers.

For consistent results parsing anything other than ISO 8601 strings, you should use String + Format.

moment("12-25-1995", "MM-DD-YYYY");

String + Formats (multiple formats)

If you have more than one format, check out their String + Formats (with an 's').

If you don't know the exact format of an input string, but know it could be one of many, you can use an array of formats.

moment("12-25-1995", ["MM-DD-YYYY", "YYYY-MM-DD"]);

Please checkout the documentation for anything more specific.

Timezone

Checkout Parsing in Zone, the equivalent documentation for timezones.

The moment.tz constructor takes all the same arguments as the moment constructor, but uses the last argument as a time zone identifier.

var b = moment.tz("May 12th 2014 8PM", "MMM Do YYYY hA", "America/Toronto");

EDIT

//...
var dateFormat = "YYYY-M-D H:m"; //<-------- This part will get rid of the warning.
var aus1_s, aus2_s, aus3_s, aus4_s, aus5_s, aus6_s, aus6_e;
if ($("#custom1 :selected").val() == "AU" ) {
    var region = 'Australia/Sydney';

    aus1_s = moment.tz('2016-9-26 19:30', dateFormat, region);              
    aus2_s = moment.tz('2016-10-2 19:30', dateFormat, region);              
    aus3_s = moment.tz('2016-10-9 19:30', dateFormat, region);                  
    aus4_s = moment.tz('2016-10-16 19:30', dateFormat, region);                 
    aus5_s = moment.tz('2016-10-23 19:30', dateFormat, region);
    aus6_s = moment.tz('2016-10-30 19:30', dateFormat, region);
    aus6_e = moment.tz('2016-11-5 19:30', dateFormat, region);
} else if ($("#custom1 :selected").val() == "NZ" ) {
    var region = 'Pacific/Auckland';

    aus1_s =  moment.tz('2016-9-28 20:30', dateFormat, region);
    aus2_s =  moment.tz('2016-10-4 20:30', dateFormat, region);
    aus3_s =  moment.tz('2016-10-11 20:30', dateFormat, region);
    aus4_s =  moment.tz('2016-10-18 20:30', dateFormat, region);
    aus5_s =  moment.tz('2016-10-25 20:30', dateFormat, region);
    aus6_s =  moment.tz('2016-11-2 20:30', dateFormat, region);
    aus6_e =  moment.tz('2016-11-9 20:30', dateFormat, region);
}
//...

Disable Transaction Log

You can't do without transaction logs in SQL Server, under any circumstances. The engine simply won't function.

You CAN set your recovery model to SIMPLE on your dev machines - that will prevent transaction log bloating when tran log backups aren't done.

ALTER DATABASE MyDB SET RECOVERY SIMPLE;

Warning:No JDK specified for module 'Myproject'.when run my project in Android studio

Run -> Edit configurations -> Select your build configuration -> JRE - change Default to one of actual JDK paths

Delete all lines starting with # or ; in Notepad++

Its possible, but not directly.

In short, go to the search, use your regex, check "mark line" and click "Find all". It results in bookmarks for all those lines.

In the search menu there is a point "delete bookmarked lines" voila.

I found the answer here (the correct answer is the second one, not the accepted!): How to delete specific lines on Notepad++?

gradlew command not found?

First thing is you need to run the gradle task that you mentioned for this wrapper. Ex : gradle wrapper After running this command, check your directory for gradlew and gradlew.bat files. gradlew is the shell script file & can be used in linux/Mac OS. gradlew.bat is the batch file for windows OS. Then run,

./gradlew build (linux/mac). It will work.

How can I get current location from user in iOS

The answer of RedBlueThing worked quite well for me. Here is some sample code of how I did it.

Header

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@interface yourController : UIViewController <CLLocationManagerDelegate> {
    CLLocationManager *locationManager;
}

@end

MainFile

In the init method

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];

Callback function

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    NSLog(@"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
    NSLog(@"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}

iOS 6

In iOS 6 the delegate function was deprecated. The new delegate is

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

Therefore to get the new position use

[locations lastObject]

iOS 8

In iOS 8 the permission should be explicitly asked before starting to update location

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
    [self.locationManager requestWhenInUseAuthorization];

[locationManager startUpdatingLocation];

You also have to add a string for the NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription keys to the app's Info.plist. Otherwise calls to startUpdatingLocation will be ignored and your delegate will not receive any callback.

And at the end when you are done reading location call stopUpdating location at suitable place.

[locationManager stopUpdatingLocation];

Is it better to use "is" or "==" for number comparison in Python?

>>> a = 255556
>>> a == 255556
True
>>> a is 255556
False

I think that should answer it ;-)

The reason is that some often-used objects, such as the booleans True and False, all 1-letter strings and short numbers are allocated once by the interpreter, and each variable containing that object refers to it. Other numbers and larger strings are allocated on demand. The 255556 for instance is allocated three times, every time a different object is created. And therefore, according to is, they are not the same.

How do I create a copy of an object in PHP?

In this example we will create iPhone class and make exact copy from it by cloning

class iPhone {

public $name;
public $email;

    public function __construct($n, $e) {

       $this->name = $n;
       $this->email = $e;

    }
}


$main = new iPhone('Dark', '[email protected]');
$copy = clone $main;


// if you want to print both objects, just write this    

echo "<pre>"; print_r($main);  echo "</pre>";
echo "<pre>"; print_r($copy);  echo "</pre>";

How to solve munmap_chunk(): invalid pointer error in C++

This happens when the pointer passed to free() is not valid or has been modified somehow. I don't really know the details here. The bottom line is that the pointer passed to free() must be the same as returned by malloc(), realloc() and their friends. It's not always easy to spot what the problem is for a novice in their own code or even deeper in a library. In my case, it was a simple case of an undefined (uninitialized) pointer related to branching.

The free() function frees the memory space pointed to by ptr, which must have been returned by a previous call to malloc(), calloc() or realloc(). Otherwise, or if free(ptr) has already been called before, undefined behavior occurs. If ptr is NULL, no operation is performed. GNU 2012-05-10 MALLOC(3)

char *words; // setting this to NULL would have prevented the issue

if (condition) {
    words = malloc( 512 );

    /* calling free sometime later works here */

    free(words)
} else {

    /* do not allocate words in this branch */
}

/* free(words);  -- error here --
*** glibc detected *** ./bin: munmap_chunk(): invalid pointer: 0xb________ ***/

There are many similar questions here about the related free() and rellocate() functions. Some notable answers providing more details:

*** glibc detected *** free(): invalid next size (normal): 0x0a03c978 ***
*** glibc detected *** sendip: free(): invalid next size (normal): 0x09da25e8 ***
glibc detected, realloc(): invalid pointer

IMHO running everything in a debugger (Valgrind) is not the best option because errors like this are often caused by inept or novice programmers. It's more productive to figure out the issue manually and learn how to avoid it in the future.

Visual Studio Copy Project

I guess if this is something you do often, there's a little (non-free) utility that promises to do it for you: I haven't used it, so not sure how good it is:

http://www.kinook.com/CopyWiz/

There is also this project on CodePlex:

http://clone.codeplex.com/

I will probably give the codeplex project a try, and if it doesn't work I'll manually rename everything and edit the sln file.

Change Color of Fonts in DIV (CSS)

Your first CSS selector—social.h2—is looking for the "social" element in the "h2", class, e.g.:

<social class="h2">

Class selectors are proceeded with a dot (.). Also, use a space () to indicate that one element is inside of another. To find an <h2> descendant of an element in the social class, try something like:

.social h2 {
  color: pink;
  font-size: 14px;
}

To get a better understanding of CSS selectors and how they are used to reference your HTML, I suggest going through the interactive HTML and CSS tutorials from CodeAcademy. I hope that this helps point you in the right direction.

java.io.IOException: Server returned HTTP response code: 500

The problem must be with the parameters you are passing(You must be passing blank parameters). For example : http://www.myurl.com?id=5&name= Check if you are handling this at the server you are calling.

jQuery: Return data after ajax call success

Note: This answer was written in February 2010.
See updates from 2015, 2016 and 2017 at the bottom.

You can't return anything from a function that is asynchronous. What you can return is a promise. I explained how promises work in jQuery in my answers to those questions:

If you could explain why do you want to return the data and what do you want to do with it later, then I might be able to give you a more specific answer how to do it.

Generally, instead of:

function testAjax() {
  $.ajax({
    url: "getvalue.php",  
    success: function(data) {
      return data; 
    }
  });
}

you can write your testAjax function like this:

function testAjax() {
  return $.ajax({
      url: "getvalue.php"
  });
}

Then you can get your promise like this:

var promise = testAjax();

You can store your promise, you can pass it around, you can use it as an argument in function calls and you can return it from functions, but when you finally want to use your data that is returned by the AJAX call, you have to do it like this:

promise.success(function (data) {
  alert(data);
});

(See updates below for simplified syntax.)

If your data is available at this point then this function will be invoked immediately. If it isn't then it will be invoked as soon as the data is available.

The whole point of doing all of this is that your data is not available immediately after the call to $.ajax because it is asynchronous. Promises is a nice abstraction for functions to say: I can't return you the data because I don't have it yet and I don't want to block and make you wait so here's a promise instead and you'll be able to use it later, or to just give it to someone else and be done with it.

See this DEMO.

UPDATE (2015)

Currently (as of March, 2015) jQuery Promises are not compatible with the Promises/A+ specification which means that they may not cooperate very well with other Promises/A+ conformant implementations.

However jQuery Promises in the upcoming version 3.x will be compatible with the Promises/A+ specification (thanks to Benjamin Gruenbaum for pointing it out). Currently (as of May, 2015) the stable versions of jQuery are 1.x and 2.x.

What I explained above (in March, 2011) is a way to use jQuery Deferred Objects to do something asynchronously that in synchronous code would be achieved by returning a value.

But a synchronous function call can do two things - it can either return a value (if it can) or throw an exception (if it can't return a value). Promises/A+ addresses both of those use cases in a way that is pretty much as powerful as exception handling in synchronous code. The jQuery version handles the equivalent of returning a value just fine but the equivalent of complex exception handling is somewhat problematic.

In particular, the whole point of exception handling in synchronous code is not just giving up with a nice message, but trying to fix the problem and continue the execution, or possibly rethrowing the same or a different exception for some other parts of the program to handle. In synchronous code you have a call stack. In asynchronous call you don't and advanced exception handling inside of your promises as required by the Promises/A+ specification can really help you write code that will handle errors and exceptions in a meaningful way even for complex use cases.

For differences between jQuery and other implementations, and how to convert jQuery promises to Promises/A+ compliant, see Coming from jQuery by Kris Kowal et al. on the Q library wiki and Promises arrive in JavaScript by Jake Archibald on HTML5 Rocks.

How to return a real promise

The function from my example above:

function testAjax() {
  return $.ajax({
      url: "getvalue.php"
  });
}

returns a jqXHR object, which is a jQuery Deferred Object.

To make it return a real promise, you can change it to - using the method from the Q wiki:

function testAjax() {
  return Q($.ajax({
      url: "getvalue.php"
  }));
}

or, using the method from the HTML5 Rocks article:

function testAjax() {
  return Promise.resolve($.ajax({
      url: "getvalue.php"
  }));
}

This Promise.resolve($.ajax(...)) is also what is explained in the promise module documentation and it should work with ES6 Promise.resolve().

To use the ES6 Promises today you can use es6-promise module's polyfill() by Jake Archibald.

To see where you can use the ES6 Promises without the polyfill, see: Can I use: Promises.

For more info see:

Future of jQuery

Future versions of jQuery (starting from 3.x - current stable versions as of May 2015 are 1.x and 2.x) will be compatible with the Promises/A+ specification (thanks to Benjamin Gruenbaum for pointing it out in the comments). "Two changes that we've already decided upon are Promise/A+ compatibility for our Deferred implementation [...]" (jQuery 3.0 and the future of Web development). For more info see: jQuery 3.0: The Next Generations by Dave Methvin and jQuery 3.0: More interoperability, less Internet Explorer by Paul Krill.

Interesting talks

Boom, Promises/A+ Was Born by Domenic Denicola (JSConfUS 2013)
Redemption from Callback Hell by Michael Jackson and Domenic Denicola (HTML5DevConf 2013)
JavaScript Promises by David M. Lee (Nodevember 2014)

UPDATE (2016)

There is a new syntax in ECMA-262, 6th Edition, Section 14.2 called arrow functions that may be used to further simplify the examples above.

Using the jQuery API, instead of:

promise.success(function (data) {
  alert(data);
});

you can write:

promise.success(data => alert(data));

or using the Promises/A+ API:

promise.then(data => alert(data));

Remember to always use rejection handlers either with:

promise.then(data => alert(data), error => alert(error));

or with:

promise.then(data => alert(data)).catch(error => alert(error));

See this answer to see why you should always use rejection handlers with promises:

Should I refrain from handling Promise rejection asynchronously?

Of course in this example you could use just promise.then(alert) because you're just calling alert with the same arguments as your callback, but the arrow syntax is more general and lets you write things like:

promise.then(data => alert("x is " + data.x));

Not every browser supports this syntax yet, but there are certain cases when you're sure what browser your code will run on - e.g. when writing a Chrome extension, a Firefox Add-on, or a desktop application using Electron, NW.js or AppJS (see this answer for details).

For the support of arrow functions, see:

UPDATE (2017)

There is an even newer syntax right now called async functions with a new await keyword that instead of this code:

functionReturningPromise()
    .then(data => console.log('Data:', data))
    .catch(error => console.log('Error:', error));

lets you write:

try {
    let data = await functionReturningPromise();
    console.log('Data:', data);
} catch (error) {
    console.log('Error:', error);
}

You can only use it inside of a function created with the async keyword. For more info, see:

For support in browsers, see:

http://caniuse.com/async-functions

For support in Node, see:

http://node.green/#ES2017-features-async-functions

In places where you don't have native support for async and await you can use Babel:

https://babeljs.io/docs/plugins/transform-async-to-generator/

or with a slightly different syntax a generator based approach like in co or Bluebird coroutines:

More info

Some other questions about promises for more details:

Differences between strong and weak in Objective-C

Here, Apple Documentation has explained the difference between weak and strong property using various examples :

https://developer.apple.com/library/ios/documentation/cocoa/conceptual/ProgrammingWithObjectiveC/EncapsulatingData/EncapsulatingData.html#//apple_ref/doc/uid/TP40011210-CH5-SW3

Here, In this blog author has collected all the properties in same place. It will help to compare properties characteristics :

http://rdcworld-iphone.blogspot.in/2012/12/variable-property-attributes-or.html

Going through a text file line by line in C

In addition to the other answers, on a recent C library (Posix 2008 compliant), you could use getline. See this answer (to a related question).

Get scroll position using jquery

I believe the best method with jQuery is using .scrollTop():

var pos = $('body').scrollTop();

Typing Greek letters etc. in Python plots

Not only can you add raw strings to matplotlib but you can also specify the font in matplotlibrc or locally with:

from matplotlib import rc

rc('font', **{'family':'serif','serif':['Palatino']})
rc('text', usetex=True)

This would change your serif latex font. You can also specify the sans-serif Helvetica like so

rc('font',**{'family':'sans-serif','sans-serif':['Helvetica']})

Other options are cursive and monospace with their respective font names. Your label would then be

fig.gca().set_xlabel(r'wavelength $5000 \AA$')

If the font doesn't supply an Angstrom symbol you can try using \mathring{A}

How to align a <div> to the middle (horizontally/width) of the page

Div centered vertically and horizontally inside the parent without fixing the content size

Here on this page is a nice overview with several solutions, too much code to share here, but it shows what is possible...

Personally I like this solution with the famous transform translate -50% trick the most. It works well for both fixed (% or px) and undefined height and width of your element.
The code is as simple as:

HTML:

<div class="center"><div>

CSS:

.center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%); /* for IE 9 */
  -webkit-transform: translate(-50%, -50%); /* for Safari */

  /* optional size in px or %: */
  width: 100px;
  height: 100px;
}

Here a fiddle that shows that it works

How to break/exit from a each() function in JQuery?

if (condition){ // where condition evaluates to true 
    return false
}

see similar question asked 3 days ago.

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

For two Entity Classes Customer and Order , hibernate will create two tables.

Possible Cases:

mappedBy is not used in Customer.java and Order.java Class then->

At customer side a new table will be created[name = CUSTOMER_ORDER] which will keep mapping of CUSTOMER_ID and ORDER_ID. These are primary keys of Customer and Order Tables. At Order side an additional column is required to save the corresponding Customer_ID record mapping.
mappedBy is used in Customer.java [As given in problem statement] Now additional table[CUSTOMER_ORDER] is not created. Only one column in Order Table
mappedby is used in Order.java Now additional table will be created by hibernate.[name = CUSTOMER_ORDER] Order Table will not have additional column [Customer_ID ] for mapping.

Any Side can be made Owner of the relationship. But its better to choose xxxToOne side.

Coding effect - > Only Owning side of entity can change relationship status. In below example BoyFriend class is owner of the relationship. even if Girlfriend wants to break-up , she can't.

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name = "BoyFriend21")
public class BoyFriend21 {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Boy_ID")
    @SequenceGenerator(name = "Boy_ID", sequenceName = "Boy_ID_SEQUENCER", initialValue = 10,allocationSize = 1)
    private Integer id;

    @Column(name = "BOY_NAME")
    private String name;

    @OneToOne(cascade = { CascadeType.ALL })
    private GirlFriend21 girlFriend;

    public BoyFriend21(String name) {
        this.name = name;
    }

    public BoyFriend21() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public BoyFriend21(String name, GirlFriend21 girlFriend) {
        this.name = name;
        this.girlFriend = girlFriend;
    }

    public GirlFriend21 getGirlFriend() {
        return girlFriend;
    }

    public void setGirlFriend(GirlFriend21 girlFriend) {
        this.girlFriend = girlFriend;
    }
}

import org.hibernate.annotations.*;
import javax.persistence.*;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Table;
import java.util.ArrayList;
import java.util.List;

@Entity 
@Table(name = "GirlFriend21")
public class GirlFriend21 {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Girl_ID")
    @SequenceGenerator(name = "Girl_ID", sequenceName = "Girl_ID_SEQUENCER", initialValue = 10,allocationSize = 1)
    private Integer id;

    @Column(name = "GIRL_NAME")
    private String name;

    @OneToOne(cascade = {CascadeType.ALL},mappedBy = "girlFriend")
    private BoyFriend21 boyFriends = new BoyFriend21();

    public GirlFriend21() {
    }

    public GirlFriend21(String name) {
        this.name = name;
    }


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public GirlFriend21(String name, BoyFriend21 boyFriends) {
        this.name = name;
        this.boyFriends = boyFriends;
    }

    public BoyFriend21 getBoyFriends() {
        return boyFriends;
    }

    public void setBoyFriends(BoyFriend21 boyFriends) {
        this.boyFriends = boyFriends;
    }
}


import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import java.util.Arrays;

public class Main578_DS {

    public static void main(String[] args) {
        final Configuration configuration = new Configuration();
         try {
             configuration.configure("hibernate.cfg.xml");
         } catch (HibernateException e) {
             throw new RuntimeException(e);
         }
        final SessionFactory sessionFactory = configuration.buildSessionFactory();
        final Session session = sessionFactory.openSession();
        session.beginTransaction();

        final BoyFriend21 clinton = new BoyFriend21("Bill Clinton");
        final GirlFriend21 monica = new GirlFriend21("monica lewinsky");

        clinton.setGirlFriend(monica);
        session.save(clinton);

        session.getTransaction().commit();
        session.close();
    }
}

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import java.util.List;

public class Main578_Modify {

    public static void main(String[] args) {
        final Configuration configuration = new Configuration();
        try {
            configuration.configure("hibernate.cfg.xml");
        } catch (HibernateException e) {
            throw new RuntimeException(e);
        }
        final SessionFactory sessionFactory = configuration.buildSessionFactory();
        final Session session1 = sessionFactory.openSession();
        session1.beginTransaction();

        GirlFriend21 monica = (GirlFriend21)session1.load(GirlFriend21.class,10);  // Monica lewinsky record has id  10.
        BoyFriend21 boyfriend = monica.getBoyFriends();
        System.out.println(boyfriend.getName()); // It will print  Clinton Name
        monica.setBoyFriends(null); // It will not impact relationship

        session1.getTransaction().commit();
        session1.close();

        final Session session2 = sessionFactory.openSession();
        session2.beginTransaction();

        BoyFriend21 clinton = (BoyFriend21)session2.load(BoyFriend21.class,10);  // Bill clinton record

        GirlFriend21 girlfriend = clinton.getGirlFriend();
        System.out.println(girlfriend.getName()); // It will print Monica name.
        //But if Clinton[Who owns the relationship as per "mappedby" rule can break this]
        clinton.setGirlFriend(null);
        // Now if Monica tries to check BoyFriend Details, she will find Clinton is no more her boyFriend
        session2.getTransaction().commit();
        session2.close();

        final Session session3 = sessionFactory.openSession();
        session1.beginTransaction();

        monica = (GirlFriend21)session3.load(GirlFriend21.class,10);  // Monica lewinsky record has id  10.
        boyfriend = monica.getBoyFriends();

        System.out.println(boyfriend.getName()); // Does not print Clinton Name

        session3.getTransaction().commit();
        session3.close();
    }
}

How can I append a query parameter to an existing URL?

This can be done by using the java.net.URI class to construct a new instance using the parts from an existing one, this should ensure it conforms to URI syntax.

The query part will either be null or an existing string, so you can decide to append another parameter with & or start a new query.

public class StackOverflow26177749 {

    public static URI appendUri(String uri, String appendQuery) throws URISyntaxException {
        URI oldUri = new URI(uri);

        String newQuery = oldUri.getQuery();
        if (newQuery == null) {
            newQuery = appendQuery;
        } else {
            newQuery += "&" + appendQuery;  
        }

        return new URI(oldUri.getScheme(), oldUri.getAuthority(),
                oldUri.getPath(), newQuery, oldUri.getFragment());
    }

    public static void main(String[] args) throws Exception {
        System.out.println(appendUri("http://example.com", "name=John"));
        System.out.println(appendUri("http://example.com#fragment", "name=John"));
        System.out.println(appendUri("http://[email protected]", "name=John"));
        System.out.println(appendUri("http://[email protected]#fragment", "name=John"));
    }
}

Shorter alternative

public static URI appendUri(String uri, String appendQuery) throws URISyntaxException {
    URI oldUri = new URI(uri);
    return new URI(oldUri.getScheme(), oldUri.getAuthority(), oldUri.getPath(),
            oldUri.getQuery() == null ? appendQuery : oldUri.getQuery() + "&" + appendQuery, oldUri.getFragment());
}

Output

http://example.com?name=John
http://example.com?name=John#fragment
http://[email protected]&name=John
http://[email protected]&name=John#fragment

Chart.js canvas resize

I had a similar problem and found your answer.. I eventually came to a solution.

It looks like the source of Chart.js has the following(presumably because it is not supposed to re-render and entirely different graph in the same canvas):

    //High pixel density displays - multiply the size of the canvas height/width by the device pixel ratio, then scale.
if (window.devicePixelRatio) {
    context.canvas.style.width = width + "px";
    context.canvas.style.height = height + "px";
    context.canvas.height = height * window.devicePixelRatio;
    context.canvas.width = width * window.devicePixelRatio;
    context.scale(window.devicePixelRatio, window.devicePixelRatio);
}

This is fine if it is called once, but when you redraw multiple times you end up changing the size of the canvas DOM element multiple times causing re-size.

Hope that helps!

Which MIME type to use for a binary file that's specific to my program?

mimetype headers are recognised by the browser for the purpose of a (fast) possible identifying a handler to use the downloaded file as target, for example, PDF would be downloaded and your Adobe Reader program would be executed with the path of the PDF file as an argument,

If your needs are to write a browser extension to handle your downloaded file, through your operation-system, or you simply want to make you project a more 'professional looking' go ahead and select a unique mimetype for you to use, it would make no difference since the operation-system would have no handle to open it with (some browsers has few bundled-plugins, for example new Google Chrome versions has a built-in PDF-reader),

if you want to make sure the file would be downloaded have a look at this answer: https://stackoverflow.com/a/34758866/257319

if you want to make your file type especially organised, it might be worth adding a few letters in the first few bytes of the file, for example, every JPG has this at it's file start:

if you can afford a jump of 4 or 8 bytes it could be very helpful for you in the rest of the way

Select multiple records based on list of Id's with linq

Nice answers abowe, but don't forget one IMPORTANT thing - they provide different results!

  var idList = new int[1, 2, 2, 2, 2]; // same user is selected 4 times
  var userProfiles = _dataContext.UserProfile.Where(e => idList.Contains(e)).ToList();

This will return 2 rows from DB (and this could be correct, if you just want a distinct sorted list of users)

BUT in many cases, you could want an unsorted list of results. You always have to think about it like about a SQL query. Please see the example with eshop shopping cart to illustrate what's going on:

  var priceListIDs = new int[1, 2, 2, 2, 2]; // user has bought 4 times item ID 2
  var shoppingCart = _dataContext.ShoppingCart
                     .Join(priceListIDs, sc => sc.PriceListID, pli => pli, (sc, pli) => sc)
                     .ToList();

This will return 5 results from DB. Using 'contains' would be wrong in this case.

Convert timestamp to date in MySQL query

you can try this
The date is of timestamp type which has the following format: ‘YYYY-MM-DD HH:MM:SS’ or ‘2008-10-05 21:34:02.’

$res = mysql_query("SELECT date FROM times;");
while ( $row = mysql_fetch_array($res) ) {
   echo $row['date'] . "
";
}

The PHP strtotime function parses the MySQL timestamp into a Unix timestamp which can be utilized for further parsing or formatting in the PHP date function.

Here are some other sample date output formats that may be of practical use:

echo date("F j, Y g:i a", strtotime($row["date"]));                  // October 5, 2008 9:34 pm
echo date("m.d.y", strtotime($row["date"]));                         // 10.05.08
echo date("j, n, Y", strtotime($row["date"]));                       // 5, 10, 2008
echo date("Ymd", strtotime($row["date"]));                           // 20081005
echo date('\i\t \i\s \t\h\e jS \d\a\y.', strtotime($row["date"]));   // It is the 5th day.
echo date("D M j G:i:s T Y", strtotime($row["date"]));               // Sun Oct 5 21:34:02 PST 2008

Understanding Chrome network log "Stalled" state

Google gives a breakdown of these fields in the Evaluating network performance section of their DevTools documentation.

Excerpt from Resource network timing:

Stalled/Blocking

Time the request spent waiting before it could be sent. This time is inclusive of any time spent in proxy negotiation. Additionally, this time will include when the browser is waiting for an already established connection to become available for re-use, obeying Chrome's maximum six TCP connection per origin rule.

(If you forget, Chrome has an "Explanation" link in the hover tooltip and under the "Timing" panel.)

Basically, the primary reason you will see this is because Chrome will only download 6 files per-server at a time and other requests will be stalled until a connection slot becomes available.

This isn't necessarily something that needs fixing, but one way to avoid the stalled state would be to distribute the files across multiple domain names and/or servers, keeping CORS in mind if applicable to your needs, however HTTP2 is probably a better option going forward. Resource bundling (like JS and CSS concatenation) can also help to reduce amount of stalled connections.

What is difference between sjlj vs dwarf vs seh?

There's a short overview at MinGW-w64 Wiki:

Why doesn't mingw-w64 gcc support Dwarf-2 Exception Handling?

The Dwarf-2 EH implementation for Windows is not designed at all to work under 64-bit Windows applications. In win32 mode, the exception unwind handler cannot propagate through non-dw2 aware code, this means that any exception going through any non-dw2 aware "foreign frames" code will fail, including Windows system DLLs and DLLs built with Visual Studio. Dwarf-2 unwinding code in gcc inspects the x86 unwinding assembly and is unable to proceed without other dwarf-2 unwind information.

The SetJump LongJump method of exception handling works for most cases on both win32 and win64, except for general protection faults. Structured exception handling support in gcc is being developed to overcome the weaknesses of dw2 and sjlj. On win64, the unwind-information are placed in xdata-section and there is the .pdata (function descriptor table) instead of the stack. For win32, the chain of handlers are on stack and need to be saved/restored by real executed code.

GCC GNU about Exception Handling:

GCC supports two methods for exception handling (EH):

DWARF-2 (DW2) EH, which requires the use of DWARF-2 (or DWARF-3) debugging information. DW-2 EH can cause executables to be slightly bloated because large call stack unwinding tables have to be included in th executables.

A method based on setjmp/longjmp (SJLJ). SJLJ-based EH is much slower than DW2 EH (penalising even normal execution when no exceptions are thrown), but can work across code that has not been compiled with GCC or that does not have call-stack unwinding information.

[...]

Structured Exception Handling (SEH)

Windows uses its own exception handling mechanism known as Structured Exception Handling (SEH). [...] Unfortunately, GCC does not support SEH yet. [...]

How do I escape double and single quotes in sed?

You can use %

sed -i "s%http://www.fubar.com%URL_FUBAR%g"

Does C# have an equivalent to JavaScript's encodeURIComponent()?

HttpUtility.HtmlEncode / Decode
HttpUtility.UrlEncode / Decode

You can add a reference to the System.Web assembly if it's not available in your project

Python: slicing a multi-dimensional array

If you use numpy, this is easy:

slice = arr[:2,:2]

or if you want the 0's,

slice = arr[0:2,0:2]

You'll get the same result.

*note that slice is actually the name of a builtin-type. Generally, I would advise giving your object a different "name".

Another way, if you're working with lists of lists*:

slice = [arr[i][0:2] for i in range(0,2)]

(Note that the 0's here are unnecessary: [arr[i][:2] for i in range(2)] would also work.).

What I did here is that I take each desired row 1 at a time (arr[i]). I then slice the columns I want out of that row and add it to the list that I'm building.

If you naively try: arr[0:2] You get the first 2 rows which if you then slice again arr[0:2][0:2], you're just slicing the first two rows over again.

*This actually works for numpy arrays too, but it will be slow compared to the "native" solution I posted above.

How to master AngularJS?

For a comprehensive and continually growing collection of links check AngularJS-Learning, a github repo that collects resources, links and interesting blog posts.

I've found very helpful the tutorials and videos on the AngularJS youtube channel. They go from the mostly basic stuff to some advanced topics, a good way to start.

The official twitter and google+ accounts are a good way to follow news and get some nice links. Also check the AngularJS Mailing list.

A nice aggregator of news/link is angularjsdaily.com.

Also there're some new books out there, so you can keep an eye on your favourite online library.

Get child Node of another Node, given node name

Check if the Node is a Dom Element, cast, and call getElementsByTagName()

Node doc = docs.item(i);
if(doc instanceof Element) {
    Element docElement = (Element)doc;
    ...
    cell = doc.getElementsByTagName("aoo").item(0);
}

In Python, how do I convert all of the items in a list to floats?

You can use numpy to convert a list directly to a floating array or matrix.

    import numpy as np
    list_ex = [1, 0] # This a list
    list_int = np.array(list_ex) # This is a numpy integer array

If you want to convert the integer array to a floating array then add 0. to it

    list_float = np.array(list_ex) + 0. # This is a numpy floating array

How can I view array structure in JavaScript with alert()?

You can use alert(arrayObj.toSource());

Why use ICollection and not IEnumerable or List<T> on many-many/one-many relationships?

Responding to your question about List<T>:

List<T> is a class; specifying an interface allows more flexibility of implementation. A better question is "why not IList<T>?"

To answer that question, consider what IList<T> adds to ICollection<T>: integer indexing, which means the items have some arbitrary order, and can be retrieved by reference to that order. This is probably not meaningful in most cases, since items probably need to be ordered differently in different contexts.

How to change JDK version for an Eclipse project

Eclipse - specific Project change JDK Version -

If you want to change any jdk version of A specific project than you have to click ---> Project --> JRE System Library --> Properties ---> Inside Classpath Container (JRE System Library) change the Execution Environment to which ever version you want e.g. 1.7 or 1.8.

Python date string to date object

For single value the datetime.strptime method is the fastest

import arrow
from datetime import datetime
import pandas as pd

l = ['24052010']

%timeit _ = list(map(lambda x: datetime.strptime(x, '%d%m%Y').date(), l))
6.86 µs ± 56.5 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)

%timeit _ = list(map(lambda x: x.date(), pd.to_datetime(l, format='%d%m%Y')))
305 µs ± 6.32 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit _ = list(map(lambda x: arrow.get(x, 'DMYYYY').date(), l))
46 µs ± 978 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)

For a list of values the pandas pd.to_datetime is the fastest

l = ['24052010'] * 1000

%timeit _ = list(map(lambda x: datetime.strptime(x, '%d%m%Y').date(), l))
6.32 ms ± 89.6 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

%timeit _ = list(map(lambda x: x.date(), pd.to_datetime(l, format='%d%m%Y')))
1.76 ms ± 27.3 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

%timeit _ = list(map(lambda x: arrow.get(x, 'DMYYYY').date(), l))
44.5 ms ± 522 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

For ISO8601 datetime format the ciso8601 is a rocket

import ciso8601

l = ['2010-05-24'] * 1000

%timeit _ = list(map(lambda x: ciso8601.parse_datetime(x).date(), l))
241 µs ± 3.24 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

How does the compilation/linking process work?

The skinny is that a CPU loads data from memory addresses, stores data to memory addresses, and execute instructions sequentially out of memory addresses, with some conditional jumps in the sequence of instructions processed. Each of these three categories of instructions involves computing an address to a memory cell to be used in the machine instruction. Because machine instructions are of a variable length depending on the particular instruction involved, and because we string a variable length of them together as we build our machine code, there is a two step process involved in calculating and building any addresses.

First we laying out the allocation of memory as best we can before we can know what exactly goes in each cell. We figure out the bytes, or words, or whatever that form the instructions and literals and any data. We just start allocating memory and building the values that will create the program as we go, and note down anyplace we need to go back and fix an address. In that place we put a dummy to just pad the location so we can continue to calculate memory size. For example our first machine code might take one cell. The next machine code might take 3 cells, involving one machine code cell and two address cells. Now our address pointer is 4. We know what goes in the machine cell, which is the op code, but we have to wait to calculate what goes in the address cells till we know where that data will be located, i.e. what will be the machine address of that data.

If there were just one source file a compiler could theoretically produce fully executable machine code without a linker. In a two pass process it could calculate all of the actual addresses to all of the data cells referenced by any machine load or store instructions. And it could calculate all of the absolute addresses referenced by any absolute jump instructions. This is how simpler compilers, like the one in Forth work, with no linker.

A linker is something that allows blocks of code to be compiled separately. This can speed up the overall process of building code, and allows some flexibility with how the blocks are later used, in other words they can be relocated in memory, for example adding 1000 to every address to scoot the block up by 1000 address cells.

So what the compiler outputs is rough machine code that is not yet fully built, but is laid out so we know the size of everything, in other words so we can start to calculate where all of the absolute addresses will be located. the compiler also outputs a list of symbols which are name/address pairs. The symbols relate a memory offset in the machine code in the module with a name. The offset being the absolute distance to the memory location of the symbol in the module.

That's where we get to the linker. The linker first slaps all of these blocks of machine code together end to end and notes down where each one starts. Then it calculates the addresses to be fixed by adding together the relative offset within a module and the absolute position of the module in the bigger layout.

Obviously I've oversimplified this so you can try to grasp it, and I have deliberately not used the jargon of object files, symbol tables, etc. which to me is part of the confusion.

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