How to get error message when ifstream open fails

You can also throw a std::system_error as shown in the test code below. This method seems to produce more readable output than f.exception(...).

#include <exception> // <-- requires this
#include <fstream>
#include <iostream>

void process(const std::string& fileName) {
    std::ifstream f;
    f.open(fileName);

    // after open, check f and throw std::system_error with the errno
    if (!f)
        throw std::system_error(errno, std::system_category(), "failed to open "+fileName);

    std::clog << "opened " << fileName << std::endl;
}

int main(int argc, char* argv[]) {
    try {
        process(argv[1]);
    } catch (const std::system_error& e) {
        std::clog << e.what() << " (" << e.code() << ")" << std::endl;
    }
    return 0;
}

Example output (Ubuntu w/clang):

$ ./test /root/.profile
failed to open /root/.profile: Permission denied (system:13)
$ ./test missing.txt
failed to open missing.txt: No such file or directory (system:2)
$ ./test ./test
opened ./test
$ ./test $(printf '%0999x')
failed to open 000...000: File name too long (system:36)

How to apply CSS to iframe?

Well, I have followed these steps:

Div with a class to hold iframe
Add iframe to the div.
In CSS file,

divClass { width: 500px; height: 500px; }
divClass iframe { width: 100%; height: 100%; }

This works in IE 6. Should work in other browsers, do check!

Pandas: ValueError: cannot convert float NaN to integer

ValueError: cannot convert float NaN to integer

From v0.24, you actually can. Pandas introduces Nullable Integer Data Types which allows integers to coexist with NaNs.

Given a series of whole float numbers with missing data,

s = pd.Series([1.0, 2.0, np.nan, 4.0])
s

0    1.0
1    2.0
2    NaN
3    4.0
dtype: float64

s.dtype
# dtype('float64')

You can convert it to a nullable int type (choose from one of Int16, Int32, or Int64) with,

s2 = s.astype('Int32') # note the 'I' is uppercase
s2

0      1
1      2
2    NaN
3      4
dtype: Int32

s2.dtype
# Int32Dtype()

Your column needs to have whole numbers for the cast to happen. Anything else will raise a TypeError:

s = pd.Series([1.1, 2.0, np.nan, 4.0])

s.astype('Int32')
# TypeError: cannot safely cast non-equivalent float64 to int32

height: calc(100%) not working correctly in CSS

You don't need to calculate anything, and probably shouldn't:

<!DOCTYPE html>
<head>
<style type="text/css">
    body {background: blue; height:100%;}
    header {background: red; height: 20px; width:100%}
    h1 {font-size:1.2em; margin:0; padding:0; 
        height: 30px; font-weight: bold; background:yellow}
    .theCalcDiv {background-color:green; padding-bottom: 100%}
</style>
</head>
<body>
<header>Some nav stuff here</header>
<h1>This is the heading</h1>
<div class="theCalcDiv">This blocks needs to have a CSS calc() height of 100% - the height of the other elements.
</div>

I stuck it all together for brevity.

Can I pass a JavaScript variable to another browser window?

In your parent window:

var yourValue = 'something';
window.open('/childwindow.html?yourKey=' + yourValue);

Then in childwindow.html:

var query = location.search.substring(1);
var parameters = {};
var keyValues = query.split(/&/);
for (var keyValue in keyValues) {
    var keyValuePairs = keyValue.split(/=/);
    var key = keyValuePairs[0];
    var value = keyValuePairs[1];
    parameters[key] = value;
}

alert(parameters['yourKey']);

There is potentially a lot of error checking you should be doing in the parsing of your key/value pairs but I'm not including it here. Maybe someone can provide a more inclusive Javascript query string parsing routine in a later answer.

How to find list of possible words from a letter matrix [Boggle Solver]

Here is the solution Using Predefined words in NLTK toolkit NLTK has nltk.corpus package in that we have package called words and it contains more than 2Lakhs English words you can simply use all into your program.

Once creating your matrix convert it into a character array and perform this code

import nltk
from nltk.corpus import words
from collections import Counter

def possibleWords(input, charSet):
    for word in input:
        dict = Counter(word)
        flag = 1
        for key in dict.keys():
            if key not in charSet:
                flag = 0
        if flag == 1 and len(word)>5: #its depends if you want only length more than 5 use this otherwise remove that one. 
            print(word)


nltk.download('words')
word_list = words.words()
# prints 236736
print(len(word_list))
charSet = ['h', 'e', 'l', 'o', 'n', 'v', 't']
possibleWords(word_list, charSet)

Output:

eleven
eleventh
elevon
entente
entone
ethene
ethenol
evolve
evolvent
hellhole
helvell
hooven
letten
looten
nettle
nonene
nonent
nonlevel
notelet
novelet
novelette
novene
teenet
teethe
teevee
telethon
tellee
tenent
tentlet
theelol
toetoe
tonlet
toothlet
tootle
tottle
vellon
velvet
velveteen
venene
vennel
venthole
voeten
volent
volvelle
volvent
voteen

I hope you get it.

Clearing state es6 React

This is the solution implemented as a function:

Class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = this.getInitialState();
  }

  getInitialState = () => ({
    /* state props */
  })

  resetState = () => {
     this.setState(this.getInitialState());
  }
}

How to correctly use the extern keyword in C

All declarations of functions and variables in header files should be extern.

Exceptions to this rule are inline functions defined in the header and variables which - although defined in the header - will have to be local to the translation unit (the source file the header gets included into): these should be static.

In source files, extern shouldn't be used for functions and variables defined in the file. Just prefix local definitions with static and do nothing for shared definitions - they'll be external symbols by default.

The only reason to use extern at all in a source file is to declare functions and variables which are defined in other source files and for which no header file is provided.

Declaring function prototypes extern is actually unnecessary. Some people dislike it because it will just waste space and function declarations already have a tendency to overflow line limits. Others like it because this way, functions and variables can be treated the same way.

How do I find the PublicKeyToken for a particular dll?

Using PowerShell, you can execute this statement:

([system.reflection.assembly]::loadfile("C:\..\Full_Path\..\MyDLL.dll")).FullName

The output will provide the Version, Culture and PublicKeyToken as shown below:

MyDLL, Version=1.0.0.0, Culture=neutral, PublicKeyToken=669e0ddf0bb1aa2a

Comparison of Android Web Service and Networking libraries: OKHTTP, Retrofit and Volley

Looking at the Volley perspective here are some advantages for your requirement:

Volley, on one hand, is totally focused on handling individual, small HTTP requests. So if your HTTP request handling has some quirks, Volley probably has a hook for you. If, on the other hand, you have a quirk in your image handling, the only real hook you have is ImageCache. "It’s not nothing, but it’s not a lot!, either". but it has more other advantages like Once you define your requests, using them from within a fragment or activity is painless unlike parallel AsyncTasks

Pros and cons of Volley:

So what’s nice about Volley?

The networking part isn’t just for images. Volley is intended to be an integral part of your back end. For a fresh project based off of a simple REST service, this could be a big win.
NetworkImageView is more aggressive about request cleanup than Picasso, and more conservative in its GC usage patterns. NetworkImageView relies exclusively on strong memory references, and cleans up all request data as soon as a new request is made for an ImageView, or as soon as that ImageView moves offscreen.
Performance. This post won’t evaluate this claim, but they’ve clearly taken some care to be judicious in their memory usage patterns. Volley also makes an effort to batch callbacks to the main thread to reduce context switching.
Volley apparently has futures, too. Check out RequestFuture if you’re interested.
If you’re dealing with high-resolution compressed images, Volley is the only solution here that works well.
Volley can be used with Okhttp (New version of Okhttp supports NIO for better performance )
Volley plays nice with the Activity life cycle.

Problems With Volley:
Since Volley is new, few things are not supported yet, but it's fixed.

Multipart Requests (Solution: https://github.com/vinaysshenoy/enhanced-volley)
status code 201 is taken as an error, Status code from 200 to 207 are successful responses now.(Fixed: https://github.com/Vinayrraj/CustomVolley)

Update: in latest release of Google volley, the 2XX Status codes bug is fixed now!Thanks to Ficus Kirkpatrick!
it's less documented but many of the people are supporting volley in github, java like documentation can be found here. On android developer website, you may find guide for Transmitting Network Data Using Volley. And volley source code can be found at Google Git
To solve/change Redirect Policy of Volley Framework use Volley with OkHTTP (CommonsWare mentioned above)

Also you can read this Comparing Volley's image loading with Picasso

Retrofit:

It's released by Square, This offers very easy to use REST API's (Update: Voila! with NIO support)

Pros of Retrofit:

Compared to Volley, Retrofit's REST API code is brief and provides excellent API documentation and has good support in communities! It is very easy to add into the projects.
We can use it with any serialization library, with error handling.

Update: - There are plenty of very good changes in Retrofit 2.0.0-beta2

version 1.6 of Retrofit with OkHttp 2.0 is now dependent on Okio to support java.io and java.nio which makes it much easier to access, store and process your data using ByteString and Buffer to do some clever things to save CPU and memory. (FYI: This reminds me of the Koush's OIN library with NIO support!) We can use Retrofit together with RxJava to combine and chain REST calls using rxObservables to avoid ugly callback chains (to avoid callback hell!!).

Cons of Retrofit for version 1.6:

Memory related error handling functionality is not good (in older versions of Retrofit/OkHttp) not sure if it's improved with the Okio with Java NIO support.
Minimum threading assistance can result call back hell if we use this in an improper way.

(All above Cons have been solved in the new version of Retrofit 2.0 beta)

========================================================================

Update:

Android Async vs Volley vs Retrofit performance benchmarks (milliseconds, lower value is better):

Android Async vs Volley vs Retrofit performance benchmarks

(FYI above Retrofit Benchmarks info will improve with java NIO support because the new version of OKhttp is dependent on NIO Okio library)

In all three tests with varying repeats (1 – 25 times), Volley was anywhere from 50% to 75% faster. Retrofit clocked in at an impressive 50% to 90% faster than the AsyncTasks, hitting the same endpoint the same number of times. On the Dashboard test suite, this translated into loading/parsing the data several seconds faster. That is a massive real-world difference. In order to make the tests fair, the times for AsyncTasks/Volley included the JSON parsing as Retrofit does it for you automatically.

RetroFit Wins in benchmark test!

In the end, we decided to go with Retrofit for our application. Not only is it ridiculously fast, but it meshes quite well with our existing architecture. We were able to make a parent Callback Interface that automatically performs error handling, caching, and pagination with little to no effort for our APIs. In order to merge in Retrofit, we had to rename our variables to make our models GSON compliant, write a few simple interfaces, delete functions from the old API, and modify our fragments to not use AsyncTasks. Now that we have a few fragments completely converted, it’s pretty painless. There were some growing pains and issues that we had to overcome, but overall it went smoothly. In the beginning, we ran into a few technical issues/bugs, but Square has a fantastic Google+ community that was able to help us through it.

When to use Volley?!

We can use Volley when we need to load images as well as consuming REST APIs!, network call queuing system is needed for many n/w request at the same time! also Volley has better memory related error handling than Retrofit!

OkHttp can be used with Volley, Retrofit uses OkHttp by default! It has SPDY support, connection pooling, disk caching, transparent compression! Recently, it has got some support of java NIO with Okio library.

Source, credit: volley-vs-retrofit by Mr. Josh Ruesch

Note: About streaming it depends on what type of streaming you want like RTSP/RTCP.

How to convert numbers to alphabet?

If you have a number, for example 65, and if you want to get the corresponding ASCII character, you can use the chr function, like this

>>> chr(65)
'A'

similarly if you have 97,

>>> chr(97)
'a'

EDIT: The above solution works for 8 bit characters or ASCII characters. If you are dealing with unicode characters, you have to specify unicode value of the starting character of the alphabet to ord and the result has to be converted using unichr instead of chr.

>>> print unichr(ord(u'\u0B85'))
?

>>> print unichr(1 + ord(u'\u0B85'))
?

NOTE: The unicode characters used here are of the language called "Tamil", my first language. This is the unicode table for the same http://www.unicode.org/charts/PDF/U0B80.pdf

How to make child divs always fit inside parent div?

Make sure the outermost div has the following CSS properties:

.outer {
  /* ... */
  height: auto;
  overflow: hidden;
  /* ... */
}

how to fetch array keys with jQuery?

Don't Reinvent the Wheel, Use Underscore

I know the OP specifically mentioned jQuery but I wanted to put an answer here to introduce people to the helpful Underscore library if they are not aware of it already.

By leveraging the keys method in the Underscore library, you can simply do the following:

_.keys(foo)  #=> ["alfa", "beta"]

Plus, there's a plethora of other useful functions that are worth perusing.

Celery Received unregistered task of type (run example)

What worked for me, was to add explicit name to celery task decorator. I changed my task declaration from @app.tasks to @app.tasks(name='module.submodule.task')

Here is an example

# test_task.py
@celery.task
def test_task():
    print("Celery Task  !!!!")

# test_task.py
@celery.task(name='tasks.test.test_task')
def test_task():
    print("Celery Task  !!!!")

Force browser to clear cache

Do you want to clear the cache, or just make sure your current (changed?) page is not cached?

If the latter, it should be as simple as

<META HTTP-EQUIV="Pragma" CONTENT="no-cache">

How do you get the process ID of a program in Unix or Linux using Python?

Also: Python: How to get PID by process name?

Adaptation to previous posted answers.

def getpid(process_name):
    import os
    return [item.split()[1] for item in os.popen('tasklist').read().splitlines()[4:] if process_name in item.split()]

getpid('cmd.exe')
['6560', '3244', '9024', '4828']

Cannot create PoolableConnectionFactory

I changed the driver version in pom.xml and helped me

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>42.2.2</version>
</dependency>

Get first day of week in SQL Server

Googled this script:

create function dbo.F_START_OF_WEEK
(
    @DATE           datetime,
    -- Sun = 1, Mon = 2, Tue = 3, Wed = 4
    -- Thu = 5, Fri = 6, Sat = 7
    -- Default to Sunday
    @WEEK_START_DAY     int = 1 
)
/*
Find the fisrt date on or before @DATE that matches 
day of week of @WEEK_START_DAY.
*/
returns     datetime
as
begin
declare  @START_OF_WEEK_DATE    datetime
declare  @FIRST_BOW     datetime

-- Check for valid day of week
if @WEEK_START_DAY between 1 and 7
    begin
    -- Find first day on or after 1753/1/1 (-53690)
    -- matching day of week of @WEEK_START_DAY
    -- 1753/1/1 is earliest possible SQL Server date.
    select @FIRST_BOW = convert(datetime,-53690+((@WEEK_START_DAY+5)%7))
    -- Verify beginning of week not before 1753/1/1
    if @DATE >= @FIRST_BOW
        begin
        select @START_OF_WEEK_DATE = 
        dateadd(dd,(datediff(dd,@FIRST_BOW,@DATE)/7)*7,@FIRST_BOW)
        end
    end

return @START_OF_WEEK_DATE

end
go

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=47307

"Too many characters in character literal error"

I faced the same issue. String.Replace('\\.','') is not valid statement and throws the same error. Thanks to C# we can use double quotes instead of single quotes and following works String.Replace("\\.","")

How do I use updatePanel in asp.net without refreshing all page?

Please refer below Ajax overview:

http://msdn.microsoft.com/en-us/library/bb386454.aspx

C++ IDE for Linux?

In my eyes best IDE for Linux is SlickEdit. It cost some money but it is fast, great support for tagging and great diff tool, works well with huge project.

Setting a max height on a table

In Tables, For minimum table cells height or rows height use css height: in place of min-height:

AND

For Limiting max-height of all cells or rows in table with Javascript:

This script is good for horizontal overflow tables.

This script increase the table width 300px each time (maximum 4000px) until rows shrinks to max-height(160px) , and you can also edit numbers as your need.

var i = 0, row, table = document.getElementsByTagName('table')[0], j = table.offsetWidth;
while (row = table.rows[i++]) {
    while (row.offsetHeight > 160 && j < 4000) {
        j += 300;
        table.style.width = j + 'px';
    }
}

Source: HTML Table Solution Max Height Limit For Rows Or Cells By Increasing Table Width, Javascript

Recommended way of making React component/div draggable

react-draggable is also easy to use. Github:

https://github.com/mzabriskie/react-draggable

import React, {Component} from 'react';
import ReactDOM from 'react-dom';
import Draggable from 'react-draggable';

var App = React.createClass({
    render() {
        return (
            <div>
                <h1>Testing Draggable Windows!</h1>
                <Draggable handle="strong">
                    <div className="box no-cursor">
                        <strong className="cursor">Drag Here</strong>
                        <div>You must click my handle to drag me</div>
                    </div>
                </Draggable>
            </div>
        );
    }
});

ReactDOM.render(
    <App />, document.getElementById('content')
);

And my index.html:

<html>
    <head>
        <title>Testing Draggable Windows</title>
        <link rel="stylesheet" type="text/css" href="style.css" />
    </head>
    <body>
        <div id="content"></div>
        <script type="text/javascript" src="bundle.js" charset="utf-8"></script>    
    <script src="http://localhost:8080/webpack-dev-server.js"></script>
    </body>
</html>

You need their styles, which is short, or you don't get quite the expected behavior. I like the behavior more than some of the other possible choices, but there's also something called react-resizable-and-movable. I'm trying to get resize working with draggable, but no joy so far.

The project cannot be built until the build path errors are resolved.

This what fixed it for me...

I was having an issue with my spring-core.jar. I deleted the entire release directory located here. (I'm on win 10).

C:\Users********.m2\repository\org\springframework\spring-core\4.3.1.RELEASE

I right clicked on the project > Maven > Update project and my exclamation mark disappeared. No problems any more.

Here is the source where I found the information:

http://crunchify.com/cannot-be-read-or-is-not-a-valid-zip-file-how-to-fix-maven-build-path-error-with-corrupted-jar-file/

How can I add comments in MySQL?

Several ways:

# Comment
-- Comment
/* Comment */

Remember to put the space after --.

See the documentation.

Return string without trailing slash

Try this:

function someFunction(site)     
{     
    return site.replace(/\/$/, "");
}

Best way to test for a variable's existence in PHP; isset() is clearly broken

Attempting to give an overview of the various discussions and answers:

There is no single answer to the question which can replace all the ways isset can be used. Some use cases are addressed by other functions, while others do not stand up to scrutiny, or have dubious value beyond code golf. Far from being "broken" or "inconsistent", other use cases demonstrate why isset's reaction to null is the logical behaviour.

Real use cases (with solutions)

1. Array keys

Arrays can be treated like collections of variables, with unset and isset treating them as though they were. However, since they can be iterated, counted, etc, a missing value is not the same as one whose value is null.

The answer in this case, is to use array_key_exists() instead of isset().

Since this is takes the array to check as a function argument, PHP will still raise "notices" if the array itself doesn't exist. In some cases, it can validly be argued that each dimension should have been initialised first, so the notice is doing its job. For other cases, a "recursive" array_key_exists function, which checked each dimension of the array in turn, would avoid this, but would basically be the same as @array_key_exists. It is also somewhat tangential to the handling of null values.

2. Object properties

In the traditional theory of "Object-Oriented Programming", encapsulation and polymorphism are key properties of objects; in a class-based OOP implementation like PHP's, the encapsulated properties are declared as part of the class definition, and given access levels (public, protected, or private).

However, PHP also allows you to dynamically add properties to an object, like you would keys to an array, and some people use class-less objects (technically, instances of the built in stdClass, which has no methods or private functionality) in a similar way to associative arrays. This leads to situations where a function may want to know if a particular property has been added to the object given to it.

As with array keys, a solution for checking object properties is included in the language, called, reasonably enough, property_exists.

Non-justifiable use cases, with discussion

3. `register_globals`, and other pollution of the global namespace

The register_globals feature added variables to the global scope whose names were determined by aspects of the HTTP request (GET and POST parameters, and cookies). This can lead to buggy and insecure code, which is why it has been disabled by default since PHP 4.2, released Aug 2000 and removed completely in PHP 5.4, released Mar 2012. However, it's possible that some systems are still running with this feature enabled or emulated. It's also possible to "pollute" the global namespace in other ways, using the global keyword, or $GLOBALS array.

Firstly, register_globals itself is unlikely to unexpectedly produce a null variable, since the GET, POST, and cookie values will always be strings (with '' still returning true from isset), and variables in the session should be entirely under the programmer's control.

Secondly, pollution of a variable with the value null is only an issue if this over-writes some previous initialization. "Over-writing" an uninitialized variable with null would only be problematic if code somewhere else was distinguishing between the two states, so on its own this possibility is an argument against making such a distinction.

4. `get_defined_vars` and `compact`

A few rarely-used functions in PHP, such as get_defined_vars and compact, allow you to treat variable names as though they were keys in an array. For global variables, the super-global array $GLOBALS allows similar access, and is more common. These methods of access will behave differently if a variable is not defined in the relevant scope.

Once you've decided to treat a set of variables as an array using one of these mechanisms, you can do all the same operations on it as on any normal array. Consequently, see 1.

Functionality that existed only to predict how these functions are about to behave (e.g. "will there be a key 'foo' in the array returned by get_defined_vars?") is superfluous, since you can simply run the function and find out with no ill effects.

4a. Variable variables (`$$foo`)

While not quite the same as functions which turn a set of variables into an associative array, most cases using "variable variables" ("assign to a variable named based on this other variable") can and should be changed to use an associative array instead.

A variable name, fundamentally, is the label given to a value by the programmer; if you're determining it at run-time, it's not really a label but a key in some key-value store. More practically, by not using an array, you are losing the ability to count, iterate, etc; it can also become impossible to have a variable "outside" the key-value store, since it might be over-written by $$foo.

Once changed to use an associative array, the code will be amenable to solution 1. Indirect object property access (e.g. $foo->$property_name) can be addressed with solution 2.

5. `isset` is so much easier to type than `array_key_exists`

I'm not sure this is really relevant, but yes, PHP's function names can be pretty long-winded and inconsistent sometimes. Apparently, pre-historic versions of PHP used a function name's length as a hash key, so Rasmus deliberately made up function names like htmlspecialchars so they would have an unusual number of characters...

Still, at least we're not writing Java, eh? ;)

6. Uninitialized variables have a type

The manual page on variable basics includes this statement:

Uninitialized variables have a default value of their type depending on the context in which they are used

I'm not sure whether there is some notion in the Zend Engine of "uninitialized but known type" or whether this is reading too much into the statement.

What is clear is that it makes no practical difference to their behaviour, since the behaviours described on that page for uninitialized variables are identical to the behaviour of a variable whose value is null. To pick one example, both $a and $b in this code will end up as the integer 42:

unset($a);
$a += 42;

$b = null;
$b += 42;

(The first will raise a notice about an undeclared variable, in an attempt to make you write better code, but it won't make any difference to how the code actually runs.)

99. Detecting if a function has run

(Keeping this one last, as it's much longer than the others. Maybe I'll edit it down later...)

Consider the following code:

$test_value = 'hello';
foreach ( $list_of_things as $thing ) {
    if ( some_test($thing, $test_value) ) {
        $result = some_function($thing);
    }
}
if ( isset($result) ) {
    echo 'The test passed at least once!';
}

If some_function can return null, there's a possibility that the echo won't be reached even though some_test returned true. The programmer's intention was to detect when $result had never been set, but PHP does not allow them to do so.

However, there are other problems with this approach, which become clear if you add an outer loop:

foreach ( $list_of_tests as $test_value ) {
    // something's missing here...
    foreach ( $list_of_things as $thing ) {
        if ( some_test($thing, $test_value) ) {
            $result = some_function($thing);
        }
    }
    if ( isset($result) ) {
        echo 'The test passed at least once!';
    }
}

Because $result is never initialized explicitly, it will take on a value when the very first test passes, making it impossible to tell whether subsequent tests passed or not. This is actually an extremely common bug when variables aren't initialised properly.

To fix this, we need to do something on the line where I've commented that something's missing. The most obvious solution is to set $result to a "terminal value" that some_function can never return; if this is null, then the rest of the code will work fine. If there is no natural candidate for a terminal value because some_function has an extremely unpredictable return type (which is probably a bad sign in itself), then an additional boolean value, e.g. $found, could be used instead.

Thought experiment one: the `very_null` constant

PHP could theoretically provide a special constant - as well as null - for use as a terminal value here; presumably, it would be illegal to return this from a function, or it would be coerced to null, and the same would probably apply to passing it in as a function argument. That would make this very specific case slightly simpler, but as soon as you decided to re-factor the code - for instance, to put the inner loop into a separate function - it would become useless. If the constant could be passed between functions, you could not guarantee that some_function would not return it, so it would no longer be useful as a universal terminal value.

The argument for detecting uninitialised variables in this case boils down to the argument for that special constant: if you replace the comment with unset($result), and treat that differently from $result = null, you are introducing a "value" for $result that cannot be passed around, and can only be detected by specific built-in functions.

Thought experiment two: assignment counter

Another way of thinking about what the last if is asking is "has anything made an assignment to $result?" Rather than considering it to be a special value of $result, you could maybe think of this as "metadata" about the variable, a bit like Perl's "variable tainting". So rather than isset you might call it has_been_assigned_to, and rather than unset, reset_assignment_state.

But if so, why stop at a boolean? What if you want to know how many times the test passed; you could simply extend your metadata to an integer and have get_assignment_count and reset_assignment_count...

Obviously, adding such a feature would have a trade-off in complexity and performance of the language, so it would need to be carefully weighed against its expected usefulness. As with a very_null constant, it would be useful only in very narrow circumstances, and would be similarly resistant to re-factoring.

The hopefully-obvious question is why the PHP runtime engine should assume in advance that you want to keep track of such things, rather than leaving you to do it explicitly, using normal code.

Show Console in Windows Application?

Easiest way is to start a WinForms application, go to settings and change the type to a console application.

Update an outdated branch against master in a Git repo

Update the master branch, which you need to do regardless.

Then, one of:

Rebase the old branch against the master branch. Solve the merge conflicts during rebase, and the result will be an up-to-date branch that merges cleanly against master.
Merge your branch into master, and resolve the merge conflicts.
Merge master into your branch, and resolve the merge conflicts. Then, merging from your branch into master should be clean.

None of these is better than the other, they just have different trade-off patterns.

I would use the rebase approach, which gives cleaner overall results to later readers, in my opinion, but that is nothing aside from personal taste.

To rebase and keep the branch you would:

git checkout <branch> && git rebase <target>

In your case, check out the old branch, then

git rebase master

to get it rebuilt against master.

MySQL error - #1062 - Duplicate entry ' ' for key 2

Drop the primary key first: (The primary key is your responsibility)
```
ALTER TABLE Persons DROP PRIMARY KEY ;
```
Then make all insertions:
Add new primary key just like before dropping:
```
ALTER TABLE Persons ADD PRIMARY KEY (P_Id);
```

Why does Java have an "unreachable statement" compiler error?

It is certainly a good thing to complain the more stringent the compiler is the better, as far as it allows you to do what you need. Usually the small price to pay is to comment the code out, the gain is that when you compile your code works. A general example is Haskell about which people screams until they realize that their test/debugging is main test only and short one. I personally in Java do almost no debugging while being ( in fact on purpose) not attentive.

How to replace a string in multiple files in linux command line

I did concoct my own solution before I found this question (and answers). I searched for different combinations of "replace" "several" and "xml," because that was my application, but did not find this particular one.

My problem: I had spring xml files with data for test cases, containing complex objects. A refactor on the java source code changed a lot of classes and did not apply to the xml data files. In order to save the test cases data, I needed to change all the class names in all the xml files, distributed across several directories. All while saving backup copies of the original xml files (although this was not a must, since version control would save me here).

I was looking for some combination of find + sed, because it worked for me in other situations, but not with several replacements at once.

Then I found ask ubuntu response and it helped me build my command line:

find -name "*.xml" -exec sed -s --in-place=.bak -e 's/firstWord/newFirstWord/g;s/secondWord/newSecondWord/g;s/thirdWord/newThirdWord/g' {} \;

And it worked perfectly (well, my case had six different replacements). But please note that it will touch all *.xml files under current directory. Because of that, and if you are accountable to a version control system, you might want to filter first and only pass on to sed those actually having the strings you want; like:

find -name "*.xml" -exec grep -e "firstWord" -e "secondWord" -e "thirdWord" {} \; -exec sed -s --in-place=.bak -e 's/firstWord/newFirstWord/g;s/secondWord/newSecondWord/g;s/thirdWord/newThirdWord/g' {} \;

Problem with SMTP authentication in PHP using PHPMailer, with Pear Mail works

This isn't on the code parter it's on the server side Contact your Server Manager or fix it from server if you own it If you use CPANEL/WHM GO TO WHM/SMTP RESTRICTIONS AND DISABLE IT

DirectX SDK (June 2010) Installation Problems: Error Code S1023

After uninstalling too much on my Win7-64bit machine I was stuck here too. I didn't want to reinstall the OS and none of the tricks worked expect for this registry hack below. Most of this trick I found in an old pchelpforum port but I had to adapt it to my 64-bit installation:

(For a 32-bit repair, probably skip the Wow6432Node path)

Start regedit
Go to HKEY_LOCAL_MACHINE-> SOFTWARE-> Wow6432Node-> Microsoft->DirectX
If this DirectX folder doesn't exist, create it.
If already here, make sure it's empty.

Now right click in the empty window on the right and add this data (there will probably be at least a Default string value located here, just leave it):

New->Binary Value
Name: InstalledVersion
Type: REG_BINARY
Data: 00 00 00 09 00 00 00 00

New->DWORD (32-bit) Value
Name: InstallMDX
Type: REG_DWORD
Data: 0x00000001

New->String Value
Name: SDKVersion
Type: REG_SZ
Data: 9.26.1590.0

New->String Value
Name: Version
Type: REG_SZ
Data: 4.09.00.0904

Reinstall using latest DXSDK installer. Runtime only option may work too but I didn't test it.
Profit!

How to send 100,000 emails weekly?

Short answer: While it's technically possible to send 100k e-mails each week yourself, the simplest, easiest and cheapest solution is to outsource this to one of the companies that specialize in it (I did say "cheapest": there's no limit to the amount of development time (and therefore money) that you can sink into this when trying to DIY).

Long answer: If you decide that you absolutely want to do this yourself, prepare for a world of hurt (after all, this is e-mail/e-fail we're talking about). You'll need:

e-mail content that is not spam (otherwise you'll run into additional major roadblocks on every step, even legal repercussions)
in addition, your content should be easy to distinguish from spam - that may be a bit hard to do in some cases (I heard that a certain pharmaceutical company had to all but abandon e-mail, as their brand names are quite common in spams)
a configurable SMTP server of your own, one which won't buckle when you dump 100k e-mails onto it (your ISP's upstream server won't be sufficient here and you'll make the ISP violently unhappy; we used two dedicated boxes)
some mail wrapper (e.g. PhpMailer if PHP's your poison of choice; using PHP's mail() is horrible enough by itself)
your own sender function to run in a loop, create the mails and pass them to the wrapper (note that you may run into PHP's memory limits if your app has a memory leak; you may need to recycle the sending process periodically, or even better, decouple the "creating e-mails" and "sending e-mails" altogether)

Surprisingly, that was the easy part. The hard part is actually sending it:

some servers will ban you when you send too many mails close together, so you need to shuffle and watch your queue (e.g. send one mail to [email protected], then three to other domains, only then another to [email protected])
you need to have correct PTR, SPF, DKIM records
handling remote server timeouts, misconfigured DNS records and other network pleasantries
handling invalid e-mails (and no, regex is the wrong tool for that)
handling unsubscriptions (many legitimate newsletters have been reclassified as spam due to many frustrated users who couldn't unsubscribe in one step and instead chose to "mark as spam" - the spam filters do learn, esp. with large e-mail providers)
handling bounces and rejects ("no such mailbox [email protected]","mailbox [email protected] full")
handling blacklisting and removal from blacklists (Sure, you're not sending spam. Some recipients won't be so sure - with such large list, it will happen sometimes, no matter what precautions you take. Some people (e.g. your not-so-scrupulous competitors) might even go as far to falsely report your mailings as spam - it does happen. On average, it takes weeks to get yourself removed from a blacklist.)

And to top it off, you'll have to manage the legal part of it (various federal, state, and local laws; and even different tangles of laws once you send outside the U.S. (note: you have no way of finding if [email protected] lives in Southwest Elbonia, the country with world's most draconian antispam laws)).

I'm pretty sure I missed a few heads of this hydra - are you still sure you want to do this yourself? If so, there'll be another wave, this time merely the annoying problems inherent in sending an e-mail. (You see, SMTP is a store-and-forward protocol, which means that your e-mail will be shuffled across many SMTP servers around the Internet, in the hope that the next one is a bit closer to the final recipient. Basically, the e-mail is sent to an SMTP server, which puts it into its forward queue; when time comes, it will forward it further to a different SMTP server, until it reaches the SMTP server for the given domain. This forward could happen immediately, or in a few minutes, or hours, or days, or never.) Thus, you'll see the following issues - most of which could happen en route as well as at the destination:

the remote SMTP servers don't want to talk to your SMTP server
your mails are getting marked as spam (<blink> is not your friend here, nor is <font color=...>)
your mails are delivered days, even weeks late (contrary to popular opinion, SMTP is designed to make a best effort to deliver the message sometime in the future - not to deliver it now)
your mails are not delivered at all (already sent from e-mail server on hop #4, not sent yet from server on hop #5, the server that currently holds the message crashes, data is lost)
your mails are mangled by some braindead server en route (this one is somewhat solvable with base64 encoding, but then the size goes up and the e-mail looks more suspicious)
your mails are delivered and the recipients seem not to want them ("I'm sure I didn't sign up for this, I remember exactly what I did a year ago" (of course you do, sir))
users with various versions of Microsoft Outlook and its special handling of Internet mail
wizard's apprentice mode (a self-reinforcing positive feedback loop - in other words, automated e-mails as replies to automated e-mails as replies to...; you really don't want to be the one to set this off, as you'd anger half the internet at yourself)

and it'll be your job to troubleshoot and solve this (hint: you can't, mostly). The people who run a legit mass-mailing businesses know that in the end you can't solve it, and that they can't solve it either - and they have the reasons well researched, documented and outlined (maybe even as a Powerpoint presentation - complete with sounds and cool transitions - that your bosses can understand), as they've had to explain this a million times before. Plus, for the problems that are actually solvable, they know very well how to solve them.

If, after all this, you are not discouraged and still want to do this, go right ahead: it's even possible that you'll find a better way to do this. Just know that the road ahead won't be easy - sending e-mail is trivial, getting it delivered is hard.

SSIS - Text was truncated or one or more characters had no match in the target code page - Special Characters

If you go to the Flat file connection manager under Advanced and Look at the "OutputColumnWidth" description's ToolTip It will tell you that Composit characters may use more spaces. So the "é" in "Société" most likely occupies more than one character.

EDIT: Here's something about it: http://en.wikipedia.org/wiki/Precomposed_character

Escape a string in SQL Server so that it is safe to use in LIKE expression

You specify the escape character. Documentation here:
http://msdn.microsoft.com/en-us/library/ms179859.aspx

Make the image go behind the text and keep it in center using CSS

Make it a background image that is centered.

.wrapper {background:transparent url(yourimage.jpg) no-repeat center center;}

<div class="wrapper">
 ...input boxes and labels and submit button here
</div>

How can I create an editable dropdownlist in HTML?

ComboBox with TextBox (For Pre-defined Values as well as User-defined Values.)

ComboBox with TextBox (Click Here)

how to display employee names starting with a and then b in sql

select columns
  from table
 where (
         column like 'a%' 
      or column like 'b%' )
 order by column asc

Call javascript from MVC controller action

<script>
    $(document).ready(function () {
        var msg = '@ViewBag.ErrorMessage'
        if (msg.length > 0)
            OnFailure('Register', msg);
    });

    function OnSuccess(header,Message) {
        $("#Message_Header").text(header);
        $("#Message_Text").text(Message);
        $('#MessageDialog').modal('show');
    }

    function OnFailure(header,error)
    {
        $("#Message_Header").text(header);
        $("#Message_Text").text(error);
        $('#MessageDialog').modal('show');
    }
</script>

Java 8: Lambda-Streams, Filter by Method with Exception

If you don't mind using 3rd party libraries, AOL's cyclops-react lib, disclosure::I am a contributor, has a ExceptionSoftener class that can help here.

 s.filter(softenPredicate(a->a.isActive()));

How to declare a variable in SQL Server and use it in the same Stored Procedure

What's going wrong with what you have? What error do you get, or what result do or don't you get that doesn't match your expectations?

I can see the following issues with that SP, which may or may not relate to your problem:

You have an extraneous ) after @BrandName in your SELECT (at the end)
You're not setting @CategoryID or @BrandName to anything anywhere (they're local variables, but you don't assign values to them)

Edit Responding to your comment: The error is telling you that you haven't declared any parameters for the SP (and you haven't), but you called it with parameters. Based on your reply about @CategoryID, I'm guessing you wanted it to be a parameter rather than a local variable. Try this:

CREATE PROCEDURE AddBrand
   @BrandName nvarchar(50),
   @CategoryID int
AS
BEGIN
   DECLARE @BrandID int

   SELECT @BrandID = BrandID FROM tblBrand WHERE BrandName = @BrandName

   INSERT INTO tblBrandinCategory (CategoryID, BrandID) VALUES (@CategoryID, @BrandID)
END

You would then call this like this:

EXEC AddBrand 'Gucci', 23

...assuming the brand name was 'Gucci' and category ID was 23.

Where can I download mysql jdbc jar from?

Here's a one-liner using Maven:

mvn dependency:get -Dartifact=mysql:mysql-connector-java:5.1.38

Then, with default settings, it's available in:

$HOME/.m2/repository/mysql/mysql-connector-java/5.1.38/mysql-connector-java-5.1.38.jar

Just replace the version number if you need a different one.

Adjusting HttpWebRequest Connection Timeout in C#

Something I found later which helped, is the .ReadWriteTimeout property. This, in addition to the .Timeout property seemed to finally cut down on the time threads would spend trying to download from a problematic server. The default time for .ReadWriteTimeout is 5 minutes, which for my application was far too long.

So, it seems to me:

.Timeout = time spent trying to establish a connection (not including lookup time) .ReadWriteTimeout = time spent trying to read or write data after connection established

More info: HttpWebRequest.ReadWriteTimeout Property

Edit:

Per @KyleM's comment, the Timeout property is for the entire connection attempt, and reading up on it at MSDN shows:

Timeout is the number of milliseconds that a subsequent synchronous request made with the GetResponse method waits for a response, and the GetRequestStream method waits for a stream. The Timeout applies to the entire request and response, not individually to the GetRequestStream and GetResponse method calls. If the resource is not returned within the time-out period, the request throws a WebException with the Status property set to WebExceptionStatus.Timeout.

(Emphasis mine.)

Check if a given time lies between two times regardless of date

I did it this way:

LocalTime time = LocalTime.now();
if (time.isAfter(LocalTime.of(02, 00)) && (time.isBefore(LocalTime.of(04, 00))))
{
    log.info("Checking after 2AM, before 4AM!");                    
}

Edit:

String time1 = "01:00:00";  
String time2 = "15:00:00";  
LocalTime time = LocalTime.parse(time2);  
if ((time.isAfter(LocalTime.of(20,11,13))) || (time.isBefore(LocalTime.of(14,49,0))))  
{  
    System.out.println("true");  
}  
else  
{  
    System.out.println("false");  
}

How to do SQL Like % in Linq?

In case you are not matching numeric strings, always good to have common case:

.Where(oh => oh.Hierarchy.ToUpper().Contains(mySearchString.ToUpper()))

How do I make entire div a link?

the html:

 <a class="xyz">your content</a>

the css:

.xyz{
  display: block;
}

This will make the anchor be a block level element like a div.

Change type of varchar field to integer: "cannot be cast automatically to type integer"

If you are working on development environment(or on for production env. it may be backup your data) then first to clear the data from the DB field or set the value as 0.

UPDATE table_mame SET field_name= 0;

After that to run the below query and after successfully run the query, to the schemamigration and after that run the migrate script.

ALTER TABLE table_mame ALTER COLUMN field_name TYPE numeric(10,0) USING field_name::numeric;

I think it will help you.

How to display raw html code in PRE or something like it but without escaping it

Cheap and cheerful answer:

<textarea>Some raw content</textarea>

The textarea will handle tabs, multiple spaces, newlines, line wrapping all verbatim. It copies and pastes nicely and its valid HTML all the way. It also allows the user to resize the code box. You don't need any CSS, JS, escaping, encoding.

You can alter the appearance and behaviour as well. Here's a monospace font, editing disabled, smaller font, no border:

<textarea
    style="width:100%; font-family: Monospace; font-size:10px; border:0;"
    rows="30" disabled
>Some raw content</textarea>

This solution is probably not semantically correct. So if you need that, it might be best to choose a more sophisticated answer.

Named tuple and default values for optional keyword arguments

I subclassed namedtuple and overrode the __new__ method:

from collections import namedtuple

class Node(namedtuple('Node', ['value', 'left', 'right'])):
    __slots__ = ()
    def __new__(cls, value, left=None, right=None):
        return super(Node, cls).__new__(cls, value, left, right)

This preserves an intuitive type hierarchy, which the creation of a factory function disguised as a class does not.

Display filename before matching line

grep 'search this' *.txt

worked for me to search through all .txt files (enter your own search value, of course).

How to access site running apache server over lan without internet connection

if you did change the httpd.conf file located under conf_files folder, don't use windows notepad, you need a unix text editor, try TED pad, after making any changes to your httpd.conf file save it. ps: if you use a dos/windows editor you will end up with an "Error in Apache file changed" message. so do be careful.... Salam

Bootstrap 3: pull-right for col-lg only

This problem is solved in bootstrap-4-alpha-2.

Here is the link: http://blog.getbootstrap.com/2015/12/08/bootstrap-4-alpha-2/

Clone it on github: https://github.com/twbs/bootstrap/tree/v4.0.0-alpha.2

Load CSV file with Spark

Now, there's also another option for any general csv file: https://github.com/seahboonsiew/pyspark-csv as follows:

Assume we have the following context

sc = SparkContext
sqlCtx = SQLContext or HiveContext

First, distribute pyspark-csv.py to executors using SparkContext

import pyspark_csv as pycsv
sc.addPyFile('pyspark_csv.py')

Read csv data via SparkContext and convert it to DataFrame

plaintext_rdd = sc.textFile('hdfs://x.x.x.x/blah.csv')
dataframe = pycsv.csvToDataFrame(sqlCtx, plaintext_rdd)

Bring a window to the front in WPF

The problem could be that the thread calling your code from the hook hasn't been initialized by the runtime so calling runtime methods don't work.

Perhaps you could try doing an Invoke to marshal your code on to the UI thread to call your code that brings the window to the foreground.

Java synchronized method lock on object, or method?

In java synchronization,if a thread want to enter into synchronization method it will acquire lock on all synchronized methods of that object not just on one synchronized method that thread is using. So a thread executing addA() will acquire lock on addA() and addB() as both are synchronized.So other threads with same object cannot execute addB().

The type initializer for 'MyClass' threw an exception

Check the InnerException property of the TypeInitializationException; it is likely to contain information about the underlying problem, and exactly where it occurred.

package javax.mail and javax.mail.internet do not exist

Had the same issue. Obviously these .jars were included with Java <= v8.x out of the box, but are not anymore. Thus one has to separately download them and place them in the appropriate classpath as highlighted by several folks above. I understand that the new Java is modularized and thus potentially more light-weight (which is certainly a good thing, since the old setup was a monster). On the other hand this - as we can see - breaks lots of old build setups. Since the time to fix these isn't chargeable to Oracle I guess this made their decision easy...

How to search by key=>value in a multidimensional array in PHP

Here is solution:

<?php
$students['e1003']['birthplace'] = ("Mandaluyong <br>");
$students['ter1003']['birthplace'] = ("San Juan <br>");
$students['fgg1003']['birthplace'] = ("Quezon City <br>");
$students['bdf1003']['birthplace'] = ("Manila <br>");

$key = array_search('Delata Jona', array_column($students, 'name'));
echo $key;  

?>

json and empty array

The first version is a null object while the second is an Array object with zero elements.

Null may mean here for example that no location is available for that user, no location has been requested or that some restrictions apply. Hard to tell with no reference to the API.

redirect while passing arguments

I'm a little confused. "foo.html" is just the name of your template. There's no inherent relationship between the route name "foo" and the template name "foo.html".

To achieve the goal of not rewriting logic code for two different routes, I would just define a function and call that for both routes. I wouldn't use redirect because that actually redirects the client/browser which requires them to load two pages instead of one just to save you some coding time - which seems mean :-P

So maybe:

def super_cool_logic():
    # execute common code here

@app.route("/foo")
def do_foo():
    # do some logic here
    super_cool_logic()
    return render_template("foo.html")

@app.route("/baz")
def do_baz():
    if some_condition:
        return render_template("baz.html")
    else:
        super_cool_logic()
        return render_template("foo.html", messages={"main":"Condition failed on page baz"})

I feel like I'm missing something though and there's a better way to achieve what you're trying to do (I'm not really sure what you're trying to do)

css label width not taking effect

give the style

display:inline-block;

hope this will help'

What issues should be considered when overriding equals and hashCode in Java?

There are some issues worth noticing if you're dealing with classes that are persisted using an Object-Relationship Mapper (ORM) like Hibernate, if you didn't think this was unreasonably complicated already!

Lazy loaded objects are subclasses

If your objects are persisted using an ORM, in many cases you will be dealing with dynamic proxies to avoid loading object too early from the data store. These proxies are implemented as subclasses of your own class. This means thatthis.getClass() == o.getClass() will return false. For example:

Person saved = new Person("John Doe");
Long key = dao.save(saved);
dao.flush();
Person retrieved = dao.retrieve(key);
saved.getClass().equals(retrieved.getClass()); // Will return false if Person is loaded lazy

If you're dealing with an ORM, using o instanceof Person is the only thing that will behave correctly.

Lazy loaded objects have null-fields

ORMs usually use the getters to force loading of lazy loaded objects. This means that person.name will be null if person is lazy loaded, even if person.getName() forces loading and returns "John Doe". In my experience, this crops up more often in hashCode() and equals().

If you're dealing with an ORM, make sure to always use getters, and never field references in hashCode() and equals().

Saving an object will change its state

Persistent objects often use a id field to hold the key of the object. This field will be automatically updated when an object is first saved. Don't use an id field in hashCode(). But you can use it in equals().

A pattern I often use is

if (this.getId() == null) {
    return this == other;
}
else {
    return this.getId().equals(other.getId());
}

But: you cannot include getId() in hashCode(). If you do, when an object is persisted, its hashCode changes. If the object is in a HashSet, you'll "never" find it again.

In my Person example, I probably would use getName() for hashCode and getId() plus getName() (just for paranoia) for equals(). It's okay if there are some risk of "collisions" for hashCode(), but never okay for equals().

hashCode() should use the non-changing subset of properties from equals()

Regex to replace multiple spaces with a single space

For more control you can use the replace callback to handle the value.

value = "tags:HUNT  tags:HUNT         tags:HUNT  tags:HUNT"
value.replace(new RegExp(`(?:\\s+)(?:tags)`, 'g'), $1 => ` ${$1.trim()}`)
//"tags:HUNT tags:HUNT tags:HUNT tags:HUNT"

What is the connection string for localdb for version 11

I installed the mentioned .Net 4.0.2 update but I got the same error message saying:

A network-related or instance-specific error occurred while establishing a connection to SQL Server

I checked the SqlLocalDb via console as follows:

C:\>sqllocaldb create "Test"
LocalDB instance "Test" created with version 11.0.

C:\>sqllocaldb start "Test"
LocalDB instance "Test" started.

C:\>sqllocaldb info "Test"
Name:               Test
Version:            11.0.2100.60
Shared name:
Owner:              PC\TESTUSER
Auto-create:        No
State:              Running
Last start time:    05.09.2012 21:14:14
Instance pipe name: np:\\.\pipe\LOCALDB#B8A5271F\tsql\query

This means that SqlLocalDb is installed and running correctly. So what was the reason that I could not connect to SqlLocalDB via .Net code with this connectionstring: Server=(LocalDB)\v11.0;Integrated Security=true;?

Then I realized that my application was compiled for DotNet framework 3.5 but SqlLocalDb only works for DotNet 4.0.

After correcting this, the problem was solved.

How can I open a .tex file?

A .tex file should be a LaTeX source file.

If this is the case, that file contains the source code for a LaTeX document. You can open it with any text editor (notepad, notepad++ should work) and you can view the source code. But if you want to view the final formatted document, you need to install a LaTeX distribution and compile the .tex file.

Of course, any program can write any file with any extension, so if this is not a LaTeX document, then we can't know what software you need to install to open it. Maybe if you upload the file somewhere and link it in your question we can see the file and provide more help to you.

Yes, this is the source code of a LaTeX document. If you were able to paste it here, then you are already viewing it. If you want to view the compiled document, you need to install a LaTeX distribution. You can try to install MiKTeX then you can use that to compile the document to a .pdf file.

You can also check out this question and answer for how to do it: How to compile a LaTeX document?

Also, there's an online LaTeX editor and you can paste your code in there to preview the document: https://www.overleaf.com/.

Resize svg when window is resized in d3.js

If you want to bind custom logic to resize event, nowadays you may start using ResizeObserver browser API for the bounding box of an SVGElement.
This will also handle the case when container is resized because of the nearby elements size change.
There is a polyfill for broader browser support.

This is how it may work in UI component:

_x000D_

function redrawGraph(container, { width, height }) {_x000D_
  d3_x000D_
    .select(container)_x000D_
    .select('svg')_x000D_
    .attr('height', height)_x000D_
    .attr('width', width)_x000D_
    .select('rect')_x000D_
    .attr('height', height)_x000D_
    .attr('width', width);_x000D_
}_x000D_
_x000D_
// Setup observer in constructor_x000D_
const resizeObserver = new ResizeObserver((entries, observer) => {_x000D_
  for (const entry of entries) {_x000D_
    // on resize logic specific to this component_x000D_
    redrawGraph(entry.target, entry.contentRect);_x000D_
  }_x000D_
})_x000D_
_x000D_
// Observe the container_x000D_
const container = document.querySelector('.graph-container');_x000D_
resizeObserver.observe(container)

_x000D_

.graph-container {_x000D_
  height: 75vh;_x000D_
  width: 75vw;_x000D_
}_x000D_
_x000D_
.graph-container svg rect {_x000D_
  fill: gold;_x000D_
  stroke: steelblue;_x000D_
  stroke-width: 3px;_x000D_
}

_x000D_

<script src="https://unpkg.com/[email protected]/dist/ResizeObserver.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>_x000D_
_x000D_
<figure class="graph-container">_x000D_
  <svg width="100" height="100">_x000D_
    <rect x="0" y="0" width="100" height="100" />_x000D_
  </svg>_x000D_
</figure>

_x000D_

// unobserve in component destroy method
this.resizeObserver.disconnect()

How to style components using makeStyles and still have lifecycle methods in Material UI?

useStyles is a React hook which are meant to be used in functional components and can not be used in class components.

From React:

Hooks let you use state and other React features without writing a class.

Also you should call useStyles hook inside your function like;

function Welcome() {
  const classes = useStyles();
...

If you want to use hooks, here is your brief class component changed into functional component;

import React from "react";
import { Container, makeStyles } from "@material-ui/core";

const useStyles = makeStyles({
  root: {
    background: "linear-gradient(45deg, #FE6B8B 30%, #FF8E53 90%)",
    border: 0,
    borderRadius: 3,
    boxShadow: "0 3px 5px 2px rgba(255, 105, 135, .3)",
    color: "white",
    height: 48,
    padding: "0 30px"
  }
});

function Welcome() {
  const classes = useStyles();
  return (
    <Container className={classes.root}>
      <h1>Welcome</h1>
    </Container>
  );
}

export default Welcome;

on ↓ CodeSandBox ↓

Bind service to activity in Android

First of all, 2 thing that we need to understand

Client

it make request to specific server

bindService(new 
    Intent("com.android.vending.billing.InAppBillingService.BIND"),
        mServiceConn, Context.BIND_AUTO_CREATE);`

here mServiceConn is instance of ServiceConnection class(inbuilt) it is actually interface that we need to implement with two (1st for network connected and 2nd network not connected) method to monitor network connection state.

Server

It handle the request of client and make replica of it's own which is private to client only who send request and this replica of server runs on different thread.

Now at client side, how to access all the method of server?

server send response with IBind Object.so IBind object is our handler which access all the method of service by using (.) operator.

MyService myService;
public ServiceConnection myConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder binder) {
        Log.d("ServiceConnection","connected");
        myService = binder;
    }
    //binder comes from server to communicate with method's of 

    public void onServiceDisconnected(ComponentName className) {
        Log.d("ServiceConnection","disconnected");
        myService = null;
    }
}

now how to call method which lies in service

myservice.serviceMethod();

here myService is object and serviceMethode is method in service. And by this way communication is established between client and server.

How to change the color of header bar and address bar in newest Chrome version on Lollipop?

From the Official documentation,

For example, to set the background color to orange:

<meta name="theme-color" content="#db5945">

In addition, Chrome will show beautiful high-res favicons when they’re provided. Chrome for Android picks the highest res icon that you provide, and we recommend providing a 192×192px PNG file. For example:

<link rel="icon" sizes="192x192" href="nice-highres.png">

PHP - warning - Undefined property: stdClass - fix?

The response itself seems to have the size of the records. You can use that to check if records exist. Something like:

if($response->size > 0){
    $role_arr = getRole($response->records);
}

How can I check out a GitHub pull request with git?

Suppose your origin and upstream info is like below

   $ git remote -v
   origin  [email protected]:<yourname>/<repo_name>.git (fetch)
   origin  [email protected]:<yourname>/<repo_name>.git (push)
   upstream   [email protected]:<repo_owner>/<repo_name>.git (fetch)
   upstream   [email protected]:<repo_owner>/<repo_name>.git (push)

and your branch name is like

   <repo_owner>:<BranchName>

then

   git pull origin <BranchName>

shall do the job

How do I remove a single file from the staging area (undo git add)?

If you want to remove files following a certain pattern and you are using git rm --cached, you can use file-glob patterns too.

See here.

Regular expression to match non-ASCII characters?

var words_in_text = function (text) {
    var regex = /([\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]+)/g;
    return text.match(regex);
};

words_in_text('Düsseldorf, Köln, ??????, ???, ??????? !@#$');

// returns array ["Düsseldorf", "Köln", "??????", "???", "???????"]

This regex will match all words in the text of any language...

Missing `server' JVM (Java\jre7\bin\server\jvm.dll.)

To Fix The "Missing "server" JVM at C:\Program Files\Java\jre7\bin\server\jvm.dll, please install or use the JRE or JDK that contains these missing components.

Follow these steps:

Go to oracle.com and install Java JRE7 (Check if Java 6 is not installed already)

After that, go to C:/Program files/java/jre7/bin

Here, create an folder called Server

Now go into the C:/Program files/java/jre7/bin/client folder

Copy all the data in this folder into the new C:/Program files/java/jre7/bin/Server folder

How to disable or enable viewpager swiping in android

This worked for me.

   ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            // disable swipe
            if(!swipeEnabled) {
                if (viewPager.getAdapter().getCount()>1) {
                    viewPager.setCurrentItem(1);
                    viewPager.setCurrentItem(0);
                }
            }
        }
        public void onPageScrollStateChanged(int state) {}
        public void onPageSelected(int position) {}
    };
    viewPager.addOnPageChangeListener(onPageChangeListener);

C# Create New T()

Another way is to use reflection:

protected T GetObject<T>(Type[] signature, object[] args)
{
    return (T)typeof(T).GetConstructor(signature).Invoke(args);
}

css divide width 100% to 3 column

A perfect 1/3 cannot exist in CSS with full cross browser support (anything below IE9). I personally would do: (It's not the perfect solution, but it's about as good as you'll get for all browsers)

#c1, #c2 {
    width: 33%;
}

#c3 {
    width: auto;
}

Insert Update trigger how to determine if insert or update

i do this:

select isnull((select top 1 1 from inserted t1),0) + isnull((select top 1 2 from deleted t1),0)

1 -> insert

2 -> delete

3 -> update

set @i = isnull((select top 1 1 from inserted t1),0) + isnull((select top 1 2 from deleted t1),0)
--select @i

declare @action varchar(1) = case @i when 1 then 'I' when 2 then 'D' when 3 then 'U' end
--select @action


select @action c1,* from inserted t1 where @i in (1,3) union all
select @action c1,* from deleted t1 where @i in (2)

How do I find the last column with data?

Lots of ways to do this. The most reliable is find.

Dim rLastCell As Range

Set rLastCell = ws.Cells.Find(What:="*", After:=ws.Cells(1, 1), LookIn:=xlFormulas, LookAt:= _
xlPart, SearchOrder:=xlByColumns, SearchDirection:=xlPrevious, MatchCase:=False)

MsgBox ("The last used column is: " & rLastCell.Column)

If you want to find the last column used in a particular row you can use:

Dim lColumn As Long

lColumn = ws.Cells(1, Columns.Count).End(xlToLeft).Column

Using used range (less reliable):

Dim lColumn As Long

lColumn = ws.UsedRange.Columns.Count

Using used range wont work if you have no data in column A. See here for another issue with used range:

See Here regarding resetting used range.

Getting permission denied (public key) on gitlab

Change permission :: chmod 400 ~/.ssh/id_rsa It helped for me.

Creating a Zoom Effect on an image on hover using CSS?

 -webkit-transition: all 1s ease; /* Safari and Chrome */
-moz-transition: all 1s ease; /* Firefox */
-ms-transition: all 1s ease; /* IE 9 */
-o-transition: all 1s ease; /* Opera */
transition: all 1s ease;

just want to make a note on the above transitions only need

 -webkit-transition: all 1s ease; /* Safari and Chrome */
transition: all 1s ease;

and -ms- certainly doenst work for IE 9 i dont know where you got that idea from.

Inline elements shifting when made bold on hover

I had a problem similar to yours. I wanted my links to get bold when you hover over them but not only in the menu but also in the text. As you cen guess it would be a real chore figuring out all the different widths. The solution is pretty simple:

Create a box that contains the link text in bold but coloured like your background and but your real link above it. Here's an example from my page:

CSS:

.hypo { font-weight: bold; color: #FFFFE0; position: static; z-index: 0; }
.hyper { position: absolute; z-index: 1; }

Of course you need to replace #FFFFE0 by the background colour of your page. The z-indices don't seem to be necessary but I put them anyway (as the "hypo" element will occur after the "hyper" element in the HTML-Code). Now, to put a link on your page, include the following:

HTML:

You can find foo <a href="http://bar.com" class="hyper">here</a><span class="hypo">here</span>

The second "here" will be invisible and hidden below your link. As this is a static box with your link text in bold, the rest of your text won't shift any longer as it is already shifted before you hover over the link.

Hope I was able to help :).

So long

Remove duplicate dict in list in Python

How to insert a string which contains an "&"

If you are using sql plus then I think that you need to issue the command

SET SCAN OFF

How to remove ASP.Net MVC Default HTTP Headers?

As shown on Removing standard server headers on Windows Azure Web Sites page, you can remove headers with the following:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <httpProtocol>
      <customHeaders>
        <clear />
      </customHeaders>
    </httpProtocol>
    <security>
      <requestFiltering removeServerHeader="true"/>
    </security>
  </system.webServer>
  <system.web>
    <httpRuntime enableVersionHeader="false" />
  </system.web>
</configuration>

This removes the Server header, and the X- headers.

This worked locally in my tests in Visual Studio 2015.

Bootstrap Modal sitting behind backdrop

Many times , you cannot move the modal outside as this affects your design structure.

The reason the backdrop comes above your modal is id the parent has any position set.

A very simple way to solve the problem other then moving your modal outside is move the backdrop inside structure were you have your modal. In your case, it could be

$(".modal-backdrop").appendTo("main");

Note that this solution is applicable if you have a definite strucure for your application and you cant just move the modal outside as it will go against the design structure

In SQL how to compare date values?

Your problem may be that you are dealing with DATETIME data, not just dates. If a row has a mydate that is '2008-11-25 09:30 AM', then your WHERE mydate<='2008-11-25'; is not going to return that row. '2008-11-25' has an implied time of 00:00 (midnight), so even though the date part is the same, they are not equal, and mydate is larger.

If you use < '2008-11-26' instead of <= '2008-11-25', that would work. The Datediff method works because it compares just the date portion, and ignores the times.

AngularJS : Why ng-bind is better than {{}} in angular?

You can refer to this site it will give you a explanation which one is better as i know {{}} this is slower than ng-bind.

http://corpus.hubwiz.com/2/angularjs/16125872.html refer this site.

get DATEDIFF excluding weekends using sql server

If you hate CASE statements as much as I do, and want to be able to use the solution inline in your queries, just get the difference of days and subtract the count of weekend days and you'll have the desired result:

declare @d1 datetime, @d2 datetime,  @days int
select @d1 = '2018/10/01',  @d2 = '2018/11/01'

SET @days = DateDiff(dd, @d1, @d2) - DateDiff(ww, @d1, @d2)*2
print @days

(The only caveat--or at least point to keep in mind--is that this calculation is not inclusive of the last date, so you might need to add one day to the end date to achieve an inclusive result)

How do I check in JavaScript if a value exists at a certain array index?

I think this decision is appropriate for guys who prefer the declarative functional programming over the imperative OOP or the procedural. If your question is "Is there some values inside? (a truthy or a falsy value)" you can use .some method to validate the values inside.

[].some(el => el || !el);

It isn't perfect but it doesn't require to apply any extra function containing the same logic, like function isEmpty(arr) { ... }.
It still sounds better than "Is it zero length?" when we do this [].length resulting to 0 which is dangerous in some cases.
Or even this [].length > 0 saying "Is its length greater than zero?"

Advanced examples:

[    ].some(el => el || !el); // false
[null].some(el => el || !el); // true
[1, 3].some(el => el || !el); // true

Is there a way to get a <button> element to link to a location without wrapping it in an <a href ... tag?

You can make it a non-submitting button (<button type="button">) and hook something like window.location = 'http://where.you.want/to/go' into its onclick handler. This does not work without javascript enabled though.

Or you can make it a submit button, and do a redirect on the server, although this obviously requires some kind of server-side logic, but the upside is that is doesn't require javascript.

(actually, forget the second solution - if you can't use a form, the submit button is out)

Angular 4 checkbox change value

This works for me, angular 9:

component.html file:

<mat-checkbox (change)="checkValue($event)">text</mat-checkbox>

component.ts file:

checkValue(e){console.log(e.target.checked)}

How can I pad an int with leading zeros when using cout << operator?

Another example to output date and time using zero as a fill character on instances of single digit values: 2017-06-04 18:13:02

#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <ctime>
using namespace std;

int main()
{
    time_t t = time(0);   // Get time now
    struct tm * now = localtime(&t);
    cout.fill('0');
    cout << (now->tm_year + 1900) << '-'
        << setw(2) << (now->tm_mon + 1) << '-'
        << setw(2) << now->tm_mday << ' '
        << setw(2) << now->tm_hour << ':'
        << setw(2) << now->tm_min << ':'
        << setw(2) << now->tm_sec
        << endl;
    return 0;
}

How to Determine the Screen Height and Width in Flutter

You can use:

double width = MediaQuery.of(context).size.width;
double height = MediaQuery.of(context).size.height;

To get height just of SafeArea (for iOS 11 and above):

var padding = MediaQuery.of(context).padding;
double newheight = height - padding.top - padding.bottom;

Not able to start Genymotion device

Try this: Remove virtual device in Genymotion and Add again the same or other device. (you will lose your settings and apps in that device)

Remove Select arrow on IE

In IE9, it is possible with purely a hack as advised by @Spudley. Since you've customized height and width of the div and select, you need to change div:before css to match yours.

In case if it is IE10 then using below css3 it is possible

select::-ms-expand {
    display: none;
}

However if you're interested in jQuery plugin, try Chosen.js or you can create your own in js.

Merge Two Lists in R

If lists always have the same structure, as in the example, then a simpler solution is

mapply(c, first, second, SIMPLIFY=FALSE)

Good MapReduce examples

From time to time I present MR concepts to people. I find processing tasks familiar to people and then map them to the MR paradigm.

Usually I take two things:

Group By / Aggregations. Here the advantage of the shuffling stage is clear. An explanation that shuffling is also distributed sort + an explanation of distributed sort algorithm also helps.
Join of two tables. People working with DB are familiar with the concept and its scalability problem. Show how it can be done in MR.

How to delete a cookie?

I had trouble deleting a cookie made via JavaScript and after I added the host it worked (scroll the code below to the right to see the location.host). After clearing the cookies on a domain try the following to see the results:

if (document.cookie.length==0)
{
 document.cookie = 'name=example; expires='+new Date((new Date()).valueOf()+1000*60*60*24*15)+'; path=/; domain='+location.host;

 if (document.cookie.length==0) {alert('Cookies disabled');}
 else
 {
  document.cookie = 'name=example; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/; domain='+location.host;

  if (document.cookie.length==0) {alert('Created AND deleted cookie successfully.');}
  else {alert('document.cookies.length = '+document.cookies.length);}
 }
}

How to control the line spacing in UILabel

Swift3 - In a UITextView or UILabel extension, add this function:

I added some code to keep the current attributed text if you are already using attributed strings with the view (instead of overwriting them).

func setLineHeight(_ lineHeight: CGFloat) {
    guard let text = self.text, let font = self.font else { return }

    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineSpacing = 1.0
    paragraphStyle.lineHeightMultiple = lineHeight
    paragraphStyle.alignment = self.textAlignment

    var attrString:NSMutableAttributedString
    if let attributed = self.attributedText {
        attrString = NSMutableAttributedString(attributedString: attributed)
    } else {
        attrString = NSMutableAttributedString(string: text)
        attrString.addAttribute(NSFontAttributeName, value: font, range: NSMakeRange(0, attrString.length))
    }
    attrString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
    self.attributedText = attrString
}

difference between @size(max = value ) and @min(value) @max(value)

@Min and @Max are used for validating numeric fields which could be String(representing number), int, short, byte etc and their respective primitive wrappers.

@Size is used to check the length constraints on the fields.

As per documentation @Size supports String, Collection, Map and arrays while @Min and @Max supports primitives and their wrappers. See the documentation.

What are the safe characters for making URLs?

You are best keeping only some characters (whitelist) instead of removing certain characters (blacklist).

You can technically allow any character, just as long as you properly encode it. But, to answer in the spirit of the question, you should only allow these characters:

Lower case letters (convert upper case to lower)
Numbers, 0 through 9
A dash - or underscore _
Tilde ~

Everything else has a potentially special meaning. For example, you may think you can use +, but it can be replaced with a space. & is dangerous, too, especially if using some rewrite rules.

As with the other comments, check out the standards and specifications for complete details.

Encrypt and decrypt a string in C#?

Here is an example using RSA.

Important: There is a limit to the size of data you can encrypt with the RSA encryption, KeySize - MinimumPadding. e.g. 256 bytes (assuming 2048 bit key) - 42 bytes (min OEAP padding) = 214 bytes (max plaintext size)

Replace your_rsa_key with your RSA key.

var provider = new System.Security.Cryptography.RSACryptoServiceProvider();
provider.ImportParameters(your_rsa_key);

var encryptedBytes = provider.Encrypt(
    System.Text.Encoding.UTF8.GetBytes("Hello World!"), true);

string decryptedTest = System.Text.Encoding.UTF8.GetString(
    provider.Decrypt(encryptedBytes, true));

For more info, visit MSDN - RSACryptoServiceProvider

Why is the Java main method static?

It is just a convention as we can see here:

The method must be declared public and static, it must not return any value, and it must accept a String array as a parameter. By default, the first non-option argument is the name of the class to be invoked. A fully-qualified class name should be used. If the -jar option is specified, the first non-option argument is the name of a JAR archive containing class and resource files for the application, with the startup class indicated by the Main-Class manifest header.

http://docs.oracle.com/javase/1.4.2/docs/tooldocs/windows/java.html#description

AngularJS: Service vs provider vs factory

Here is some broilerplate code I've come up with as a code-template for object factory in AngularjS. I've used a Car/CarFactory as an example to illustrate. Makes for simple implementation code in the controller.

     <script>
        angular.module('app', [])
            .factory('CarFactory', function() {

                /**
                 * BroilerPlate Object Instance Factory Definition / Example
                 */
                this.Car = function() {

                    // initialize instance properties
                    angular.extend(this, {
                        color           : null,
                        numberOfDoors   : null,
                        hasFancyRadio   : null,
                        hasLeatherSeats : null
                    });

                    // generic setter (with optional default value)
                    this.set = function(key, value, defaultValue, allowUndefined) {

                        // by default,
                        if (typeof allowUndefined === 'undefined') {
                            // we don't allow setter to accept "undefined" as a value
                            allowUndefined = false;
                        }
                        // if we do not allow undefined values, and..
                        if (!allowUndefined) {
                            // if an undefined value was passed in
                            if (value === undefined) {
                                // and a default value was specified
                                if (defaultValue !== undefined) {
                                    // use the specified default value
                                    value = defaultValue;
                                } else {
                                    // otherwise use the class.prototype.defaults value
                                    value = this.defaults[key];
                                } // end if/else
                            } // end if
                        } // end if

                        // update 
                        this[key] = value;

                        // return reference to this object (fluent)
                        return this;

                    }; // end this.set()

                }; // end this.Car class definition

                // instance properties default values
                this.Car.prototype.defaults = {
                    color: 'yellow',
                    numberOfDoors: 2,
                    hasLeatherSeats: null,
                    hasFancyRadio: false
                };

                // instance factory method / constructor
                this.Car.prototype.instance = function(params) {
                    return new 
                        this.constructor()
                                .set('color',           params.color)
                                .set('numberOfDoors',   params.numberOfDoors)
                                .set('hasFancyRadio',   params.hasFancyRadio)
                                .set('hasLeatherSeats', params.hasLeatherSeats)
                    ;
                };

                return new this.Car();

            }) // end Factory Definition
            .controller('testCtrl', function($scope, CarFactory) {

                window.testCtrl = $scope;

                // first car, is red, uses class default for:
                // numberOfDoors, and hasLeatherSeats
                $scope.car1     = CarFactory
                                    .instance({
                                        color: 'red'
                                    })
                                ;

                // second car, is blue, has 3 doors, 
                // uses class default for hasLeatherSeats
                $scope.car2     = CarFactory
                                    .instance({
                                        color: 'blue',
                                        numberOfDoors: 3
                                    })
                                ;
                // third car, has 4 doors, uses class default for 
                // color and hasLeatherSeats
                $scope.car3     = CarFactory
                                    .instance({
                                        numberOfDoors: 4
                                    })
                                ;
                // sets an undefined variable for 'hasFancyRadio',
                // explicitly defines "true" as default when value is undefined
                $scope.hasFancyRadio = undefined;
                $scope.car3.set('hasFancyRadio', $scope.hasFancyRadio, true);

                // fourth car, purple, 4 doors,
                // uses class default for hasLeatherSeats
                $scope.car4     = CarFactory
                                    .instance({
                                        color: 'purple',
                                        numberOfDoors: 4
                                    });
                // and then explicitly sets hasLeatherSeats to undefined
                $scope.hasLeatherSeats = undefined;
                $scope.car4.set('hasLeatherSeats', $scope.hasLeatherSeats, undefined, true);

                // in console, type window.testCtrl to see the resulting objects

            });
    </script>

Here is a simpler example. I'm using a few third party libraries that expect a "Position" object exposing latitude and longitude, but via different object properties. I didn't want to hack the vendor code, so I adjusted the "Position" objects I was passing around.

    angular.module('app')
.factory('PositionFactory', function() {

    /**
     * BroilerPlate Object Instance Factory Definition / Example
     */
    this.Position = function() {

        // initialize instance properties 
        // (multiple properties to satisfy multiple external interface contracts)
        angular.extend(this, {
            lat         : null,
            lon         : null,
            latitude    : null,
            longitude   : null,
            coords: {
                latitude: null,
                longitude: null
            }
        });

        this.setLatitude = function(latitude) {
            this.latitude           = latitude;
            this.lat                = latitude;
            this.coords.latitude    = latitude;
            return this;
        };
        this.setLongitude = function(longitude) {
            this.longitude          = longitude;
            this.lon                = longitude;
            this.coords.longitude   = longitude;
            return this;
        };

    }; // end class definition

    // instance factory method / constructor
    this.Position.prototype.instance = function(params) {
        return new 
            this.constructor()
                    .setLatitude(params.latitude)
                    .setLongitude(params.longitude)
        ;
    };

    return new this.Position();

}) // end Factory Definition

.controller('testCtrl', function($scope, PositionFactory) {
    $scope.position1 = PositionFactory.instance({latitude: 39, longitude: 42.3123});
    $scope.position2 = PositionFactory.instance({latitude: 39, longitude: 42.3333});
}) // end controller

;

Validating parameters to a Bash script

Use '-z' to test for empty strings and '-d to check for directories.

if [[ -z "$@" ]]; then
    echo >&2 "You must supply an argument!"
    exit 1
elif [[ ! -d "$@" ]]; then
    echo >&2 "$@ is not a valid directory!"
    exit 1
fi

Plugin org.apache.maven.plugins:maven-clean-plugin:2.5 or one of its dependencies could not be resolved

You need to clear your Maven repository to solve this issue.

Could not load file or assembly 'System.Web.WebPages.Razor, Version=3.0.0.0

Update using NuGet Package Manager Console in your Visual Studio

Update-Package -reinstall Microsoft.AspNet.Mvc

Using grep to help subset a data frame in R

You may also use the stringr package

library(dplyr)
library(stringr)
My.Data %>% filter(str_detect(x, '^G45'))

You may not use '^' (starts with) in this case, to obtain the results you need

single line comment in HTML

from http://htmlhelp.com/reference/wilbur/misc/comment.html

Since HTML is officially an SGML application, the comment syntax used in HTML documents is actually the SGML comment syntax. Unfortunately this syntax is a bit unclear at first.

The definition of an SGML comment is basically as follows:
A comment declaration starts with <!, followed by zero or more comments, followed by >. A comment starts and ends with "--", and does not contain any occurrence of "--".
This means that the following are all legal SGML comments:





<!>
Note that an "empty" comment tag, with just "--" characters, should always have a multiple of four "-" characters to be legal. (And yes, <!> is also a legal comment - it's the empty comment).
Not all HTML parsers get this right. For example, " hello-->" is a legal comment, as you can verify with the rule above. It is a comment tag with two comments; the first is empty and the second one contains "> hello". If you try it in a browser, you will find that the text is displayed on screen.
There are two possible reasons for this:

The browser sees the ">" character and thinks the comment ends there.
The browser sees the "-->" text and thinks the comment ends there.
There is also the problem with the "--" sequence. Some people have a habit of using things like "" as separators in their source. Unfortunately, in most cases, the number of "-" characters is not a multiple of four. This means that a browser who tries to get it right will actually get it wrong here and actually hide the rest of the document.
For this reason, use the following simple rule to compose valid and accepted comments:
An HTML comment begins with "" and does not contain "--" or ">" anywhere in the comment.

How to draw a rounded Rectangle on HTML Canvas?

Here's one I wrote... uses arcs instead of quadratic curves for better control over radius. Also, it leaves the stroking and filling up to you

    /* Canvas 2d context - roundRect
 *
 * Accepts 5 parameters, the start_x and start_y points, the end_x and end_y points, and the radius of the corners
 * 
 * No return value
 */

CanvasRenderingContext2D.prototype.roundRect = function(sx,sy,ex,ey,r) {
    var r2d = Math.PI/180;
    if( ( ex - sx ) - ( 2 * r ) < 0 ) { r = ( ( ex - sx ) / 2 ); } //ensure that the radius isn't too large for x
    if( ( ey - sy ) - ( 2 * r ) < 0 ) { r = ( ( ey - sy ) / 2 ); } //ensure that the radius isn't too large for y
    this.beginPath();
    this.moveTo(sx+r,sy);
    this.lineTo(ex-r,sy);
    this.arc(ex-r,sy+r,r,r2d*270,r2d*360,false);
    this.lineTo(ex,ey-r);
    this.arc(ex-r,ey-r,r,r2d*0,r2d*90,false);
    this.lineTo(sx+r,ey);
    this.arc(sx+r,ey-r,r,r2d*90,r2d*180,false);
    this.lineTo(sx,sy+r);
    this.arc(sx+r,sy+r,r,r2d*180,r2d*270,false);
    this.closePath();
}

Here is an example:

var _e = document.getElementById('#my_canvas');
var _cxt = _e.getContext("2d");
_cxt.roundRect(35,10,260,120,20);
_cxt.strokeStyle = "#000";
_cxt.stroke();

Oracle pl-sql escape character (for a " ' ")

you can use ESCAPE like given example below

The '_' wild card character is used to match exactly one character, while '%' is used to match zero or more occurrences of any characters. These characters can be escaped in SQL.

SELECT name FROM emp WHERE id LIKE '%/_%' ESCAPE '/';

The same works inside PL/SQL:

 if( id like '%/_%' ESCAPE '/' )

This applies only to like patterns, for example in an insert there is no need to escape _ or %, they are used as plain characters anyhow. In arbitrary strings only ' needs to be escaped by ''.

What's the difference between " " and " "?

The entity   produces a non-breaking space, which is used when you don't want an automatic line break at that position. The regular space has the character code 32, while the non-breaking space has the character code 160.

For example when you display numbers with space as thousands separator: 1 234 567, then you use non-breaking spaces so that the number can't be split on separate lines. If you display currency and there is a space between the amount and the currency: 42 SEK, then you use a non-breaking space so that you don't get the amount on one line and the currency on the next.

Laravel orderBy on a relationship

I believe you can also do:

$sortDirection = 'desc';

$user->with(['comments' => function ($query) use ($sortDirection) {
    $query->orderBy('column', $sortDirection);
}]);

That allows you to run arbitrary logic on each related comment record. You could have stuff in there like:

$query->where('timestamp', '<', $someTime)->orderBy('timestamp', $sortDirection);

What are invalid characters in XML

OK, let's separate the question of the characters that:

aren't valid at all in any XML document.
need to be escaped.

The answer provided by @dolmen in "What are invalid characters in XML" is still valid but needs to be updated with the XML 1.1 specification.

1. Invalid characters

The characters described here are all the characters that are allowed to be inserted in an XML document.

1.1. In XML 1.0

Reference: see XML recommendation 1.0, §2.2 Characters

The global list of allowed characters is:

[2] Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */

Basically, the control characters and characters out of the Unicode ranges are not allowed. This means also that calling for example the character entity  is forbidden.

1.2. In XML 1.1

Reference: see XML recommendation 1.1, §2.2 Characters, and 1.3 Rationale and list of changes for XML 1.1

The global list of allowed characters is:

[2] Char ::= [#x1-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */

[2a] RestrictedChar ::= [#x1-#x8] | [#xB-#xC] | [#xE-#x1F] | [#x7F-#x84] | [#x86-#x9F]

This revision of the XML recommendation has extended the allowed characters so control characters are allowed, and takes into account a new revision of the Unicode standard, but these ones are still not allowed : NUL (x00), xFFFE, xFFFF...

However, the use of control characters and undefined Unicode char is discouraged.

It can also be noticed that all parsers do not always take this into account and XML documents with control characters may be rejected.

2. Characters that need to be escaped (to obtain a well-formed document):

The < must be escaped with a < entity, since it is assumed to be the beginning of a tag.

The & must be escaped with a & entity, since it is assumed to be the beginning a entity reference

The > should be escaped with > entity. It is not mandatory -- it depends on the context -- but it is strongly advised to escape it.

The ' should be escaped with a ' entity -- mandatory in attributes defined within single quotes but it is strongly advised to always escape it.

The " should be escaped with a " entity -- mandatory in attributes defined within double quotes but it is strongly advised to always escape it.

Plotting multiple curves same graph and same scale

My solution is to use ggplot2. It takes care of these types of things automatically. The biggest thing is to arrange the data appropriately.

y1 <- c(100, 200, 300, 400, 500)
y2 <- c(1, 2, 3, 4, 5)
x <- c(1, 2, 3, 4, 5)
df <- data.frame(x=rep(x,2), y=c(y1, y2), class=c(rep("y1", 5), rep("y2", 5)))

Then use ggplot2 to plot it

library(ggplot2)
ggplot(df, aes(x=x, y=y, color=class)) + geom_point()

This is saying plot the data in df, and separate the points by class.

The plot generated is enter image description here

What is the opposite of :hover (on mouse leave)?

Although answers here are sufficient, I really think W3Schools example on this issue is very straightforward (it cleared up the confusion (for me) right away).

Use the :hover selector to change the style of a button when you move the mouse over it.

Tip: Use the transition-duration property to determine the speed of the "hover" effect:

Example
.button {
    -webkit-transition-duration: 0.4s; /* Safari & Chrome */
    transition-duration: 0.4s;
}

.button:hover {
    background-color: #4CAF50; /* Green */
    color: white;
}

In summary, for transitions where you want the "enter" and "exit" animations to be the same, you need to employ transitions on the main selector .button rather than the hover selector .button:hover. For transitions where you want the "enter" and "exit" animations to be different, you will need specify different main selector and hover selector transitions.

How can I throw a general exception in Java?

It really depends on what you want to do with that exception after you catch it. If you need to differentiate your exception then you have to create your custom Exception. Otherwise you could just throw new Exception("message goes here");

What is the simplest C# function to parse a JSON string into an object?

I think this is what you want:

JavaScriptSerializer JSS = new JavaScriptSerializer();
T obj = JSS.Deserialize<T>(String);

How to convert string values from a dictionary, into int/float datatypes?

for sub in the_list:
    for key in sub:
        sub[key] = int(sub[key])

Gives it a casting as an int instead of as a string.

how to install tensorflow on anaconda python 3.6

Try this one.

Python 3.6

pip install https://anaconda.org/intel/tensorflow/1.2.1/download/tensorflow-1.2.1-cp36-cp36m-linux_x86_64.whl

Source: https://software.intel.com/en-us/articles/intel-optimized-tensorflow-wheel-now-available

Prepare for Segue in Swift

Prepare for Segue in Swift 4.2 and Swift 5.

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if (segue.identifier == "OrderVC") {
        // pass data to next view
        let viewController = segue.destination as? MyOrderDetailsVC
        viewController!.OrderData = self.MyorderArray[selectedIndex]


    }
}

How to Call segue On specific Event(Like Button Click etc):

performSegue(withIdentifier: "OrderVC", sender: self)

Git Symlinks in Windows

Short answer: They are now supported nicely, if you can enable developer mode.

From https://blogs.windows.com/buildingapps/2016/12/02/symlinks-windows-10/

Now in Windows 10 Creators Update, a user (with admin rights) can first enable Developer Mode, and then any user on the machine can run the mklink command without elevating a command-line console.

What drove this change? The availability and use of symlinks is a big deal to modern developers:

Many popular development tools like git and package managers like npm recognize and persist symlinks when creating repos or packages, respectively. When those repos or packages are then restored elsewhere, the symlinks are also restored, ensuring disk space (and the user’s time) isn’t wasted.

Easy to overlook with all the other announcements of the "Creator's update", but if you enable Developer Mode, you can create symlinks without elevated privileges. You might have to re-install git and make sure symlink support is enabled, as it's not by default.

Getting scroll bar width using JavaScript

this worked for me..

 function getScrollbarWidth() { 
    var div = $('<div style="width:50px;height:50px;overflow:hidden;position:absolute;top:-200px;left:-200px;"><div style="height:100px;"></div>'); 
    $('body').append(div); 
    var w1 = $('div', div).innerWidth(); 
    div.css('overflow-y', 'scroll'); 
    var w2 = $('div', div).innerWidth(); 
    $(div).remove(); 
    return (w1 - w2); 
}

How do I get the Git commit count?

Use git shortlog just like this

git shortlog -sn

Or create an alias (for ZSH based terminal)

# show contributors by commits alias gcall="git shortlog -sn"

How do I check if the mouse is over an element in jQuery?

A clean and elegant hover check:

if ($('#element:hover').length != 0) {
    // do something ;)
}

How to make unicode string with python3

This how I solved my problem to convert chars like \uFE0F, \u000A, etc. And also emojis that encoded with 16 bytes.

example = 'raw vegan chocolate cocoa pie w chocolate &amp; vanilla cream\\uD83D\\uDE0D\\uD83D\\uDE0D\\u2764\\uFE0F Present Moment Caf\\u00E8 in St.Augustine\\u2764\\uFE0F\\u2764\\uFE0F '
import codecs
new_str = codecs.unicode_escape_decode(example)[0]
print(new_str)
>>> 'raw vegan chocolate cocoa pie w chocolate &amp; vanilla cream\ud83d\ude0d\ud83d\ude0d?? Present Moment Cafè in St.Augustine???? '
new_new_str = new_str.encode('utf-16', 'surrogatepass').decode('utf-16')
print(new_new_str)
>>> 'raw vegan chocolate cocoa pie w chocolate &amp; vanilla cream?? Present Moment Cafè in St.Augustine???? '

How to store values from foreach loop into an array?

Declare the $items array outside the loop and use $items[] to add items to the array:

$items = array();
foreach($group_membership as $username) {
 $items[] = $username;
}

print_r($items);

Continuous Integration vs. Continuous Delivery vs. Continuous Deployment

From what I've learned with Alex Cowan in the course Continuous Delivery & DevOps, CI and CD is part of a product pipeline that consists in the time it goes from an Observations to a Released Product.

From Observations to Designs the goal is to get high quality testable ideas. This part of the process is considered Continuous Design.

What happens after, when we go from the Code onwards, it's considered a Continuous Delivery capability whose aim is to execute the ideas and release to the customer very fast (you can read Jez Humble's book Continuous Delivery: Reliable Software Releases through Build, Test, and Deployment Automation for more details). The following pipeline explains which steps Continuous Integration (CI) and Continuous Delivery (CD) consist of.

Continuous Integration, as Mattias Petter Johansson explains,

is when a software team has habit of doing multiple merges per day and they have an automated verification system in place to check those merges for problems.

(you can watch the following two videos for a more pratical overview using CircleCI - Getting started with CircleCI - Continuous Integration P2 and Running CircleCI on Pull Request).

One can specify the CI/CD pipeline as following, that goes from New Code to a released Product.

The first three steps have to do with Tests, extending the boundary of what's being tested.

Continuous Deployment, on the other hand, is to handle the Deployment automatically. So, any code commit that passes the automated testing phase is automatically released into the production.

Note: This isn't necessarily what your pipelines should look like, yet they can serve as reference.

MySQL - UPDATE multiple rows with different values in one query

To Extend on @Trevedhek answer,

In case the update has to be done with non-unique keys, 4 queries will be need

NOTE: This is not transaction-safe

This can be done using a temp table.

Step 1: Create a temp table keys and the columns you want to update

CREATE TEMPORARY TABLE  temp_table_users
(
    cod_user varchar(50)
    , date varchar(50)
    , user_rol varchar(50)
    ,  cod_office varchar(50)
) ENGINE=MEMORY

Step 2: Insert the values into the temp table

Step 3: Update the original table

UPDATE table_users t1
JOIN temp_table_users tt1 using(user_rol,cod_office)
SET 
t1.cod_office = tt1.cod_office
t1.date = tt1.date

Step 4: Drop the temp table

Dynamic instantiation from string name of a class in dynamically imported module?

Use getattr to get an attribute from a name in a string. In other words, get the instance as

instance = getattr(modul, class_name)()

Deep-Learning Nan loss reasons

Regularization can help. For a classifier, there is a good case for activity regularization, whether it is binary or a multi-class classifier. For a regressor, kernel regularization might be more appropriate.

Why should the static field be accessed in a static way?

Because ... it (MILLISECONDS) is a static field (hiding in an enumeration, but that's what it is) ... however it is being invoked upon an instance of the given type (but see below as this isn't really true¹).

javac will "accept" that, but it should really be MyUnits.MILLISECONDS (or non-prefixed in the applicable scope).

¹ Actually, javac "rewrites" the code to the preferred form -- if m happened to be null it would not throw an NPE at run-time -- it is never actually invoked upon the instance).

Happy coding.

I'm not really seeing how the question title fits in with the rest :-) More accurate and specialized titles increase the likely hood the question/answers can benefit other programmers.

How do I get just the date when using MSSQL GetDate()?

Here you have few solutions ;)

http://www.bennadel.com/blog/122-Getting-Only-the-Date-Part-of-a-Date-Time-Stamp-in-SQL-Server.htm

The source was not found, but some or all event logs could not be searched

If you just want to sniff if a Source exists on the local machine but don't have ability to get authorization to do this, you can finger it through the following example (VB).

This bypasses the security error. You could similarly modify this function to return the LogName for the Source.

Public Shared Function eventLogSourceExists(sSource as String) as Boolean
    Try
        EventLog.LogNameFromSourceName(sSource, ".")
        Return True
    Catch
        Return False
    End Try
End Function

How Can I Download a File from EC2

Importing JSON into an Eclipse project

Download java-json.jar from here, which contains org.json.JSONArray

http://www.java2s.com/Code/JarDownload/java/java-json.jar.zip

nzip and add to your project's library: Project > Build Path > Configure build path> Select Library tab > Add External Libraries > Select the java-json.jar file.

How to upload a file and JSON data in Postman?

At Back-end part

Rest service in Controller will have mixed @RequestPart and MultipartFile to serve such Multipart + JSON request.

@RequestMapping(value = "/executesampleservice", method = RequestMethod.POST,
consumes = {"multipart/form-data"})

@ResponseBody
public boolean yourEndpointMethod(
    @RequestPart("properties") @Valid ConnectionProperties properties,
    @RequestPart("file") @Valid @NotNull @NotBlank MultipartFile file) {
return projectService.executeSampleService(properties, file);
}

At front-end :

formData = new FormData();

formData.append("file", document.forms[formName].file.files[0]);
formData.append('properties', new Blob([JSON.stringify({
            "name": "root",
            "password": "root"                    
        })], {
            type: "application/json"
        }));

See in the image (POSTMAN request):

Click to view Postman request in form data for both file and json

How to add a second x-axis in matplotlib

I'm forced to post this as an answer instead of a comment due to low reputation. I had a similar problem to Matteo. The difference being that I had no map from my first x-axis to my second x-axis, only the x-values themselves. So I wanted to set the data on my second x-axis directly, not the ticks, however, there is no axes.set_xdata. I was able to use Dhara's answer to do this with a modification:

ax2.lines = []

instead of using:

ax2.cla()

When in use also cleared my plot from ax1.

How to select all textareas and textboxes using jQuery?

$('input[type=text], textarea').css({width: '90%'});

That uses standard CSS selectors, jQuery also has a set of pseudo-selector filters for various form elements, for example:

$(':text').css({width: '90%'});

will match all <input type="text"> elements. See Selectors documentation for more info.

Having links relative to root?

Use

<a href="/fruits/index.html">Back to Fruits List</a>

<a href="../index.html">Back to Fruits List</a>

Python: Assign print output to a variable

probably you need one of str,repr or unicode functions

somevar = str(tag.getArtist())

depending which python shell are you using

JavaScript: function returning an object

You can simply do it like this with an object literal:

function makeGamePlayer(name,totalScore,gamesPlayed) {
    return {
        name: name,
        totalscore: totalScore,
        gamesPlayed: gamesPlayed
    };
}

Generic type conversion FROM string

I am not sure whether I understood your intentions correctly, but let's see if this one helps.

public class TypedProperty<T> : Property where T : IConvertible
{
    public T TypedValue
    {
        get { return (T)Convert.ChangeType(base.Value, typeof(T)); }
        set { base.Value = value.ToString();}
    }
}

PHP Redirect to another page after form submit

Right after @mail($email_to, $email_subject, $email_message, $headers);

header('Location: nextpage.php');

Note that you will never see 'Thanks for subscribing to our mailing list'

That should be on the next page, if you echo any text you will get an error because the headers would have been already created, if you want to redirect never return any text, not even a space!

How can git be installed on CENTOS 5.5?

I've tried few methods from this question and they all failed on my CentOs, either because of the wrong repos or missing files.

Here is the method which works for me (when installing version 1.7.8):

    yum -y install zlib-devel openssl-devel cpio expat-devel gettext-devel
    wget http://git-core.googlecode.com/files/git-1.7.8.tar.gz
    tar -xzvf ./git-1.7.8.tar.gz
    cd ./git-1.7.8
    ./configure
    make
    make install

You may want to download a different version from here: http://code.google.com/p/git-core/downloads/list

What does character set and collation mean exactly?

A character set is a subset of all written glyphs. A character encoding specifies how those characters are mapped to numeric values. Some character encodings, like UTF-8 and UTF-16, can encode any character in the Universal Character Set. Others, like US-ASCII or ISO-8859-1 can only encode a small subset, since they use 7 and 8 bits per character, respectively. Because many standards specify both a character set and a character encoding, the term "character set" is often substituted freely for "character encoding".

A collation comprises rules that specify how characters can be compared for sorting. Collations rules can be locale-specific: the proper order of two characters varies from language to language.

Choosing a character set and collation comes down to whether your application is internationalized or not. If not, what locale are you targeting?

In order to choose what character set you want to support, you have to consider your application. If you are storing user-supplied input, it might be hard to foresee all the locales in which your software will eventually be used. To support them all, it might be best to support the UCS (Unicode) from the start. However, there is a cost to this; many western European characters will now require two bytes of storage per character instead of one.

Choosing the right collation can help performance if your database uses the collation to create an index, and later uses that index to provide sorted results. However, since collation rules are often locale-specific, that index will be worthless if you need to sort results according to the rules of another locale.

How can I mimic the bottom sheet from the Maps app?

I don't know how exactly the bottom sheet of the new Maps app, responds to user interactions. But you can create a custom view that looks like the one in the screenshots and add it to the main view.

I assume you know how to:

1- create view controllers either by storyboards or using xib files.

2- use googleMaps or Apple's MapKit.

Example

1- Create 2 view controllers e.g, MapViewController and BottomSheetViewController. The first controller will host the map and the second is the bottom sheet itself.

Configure MapViewController

Create a method to add the bottom sheet view.

func addBottomSheetView() {
    // 1- Init bottomSheetVC
    let bottomSheetVC = BottomSheetViewController()

    // 2- Add bottomSheetVC as a child view 
    self.addChildViewController(bottomSheetVC)
    self.view.addSubview(bottomSheetVC.view)
    bottomSheetVC.didMoveToParentViewController(self)

    // 3- Adjust bottomSheet frame and initial position.
    let height = view.frame.height
    let width  = view.frame.width
    bottomSheetVC.view.frame = CGRectMake(0, self.view.frame.maxY, width, height)
}

And call it in viewDidAppear method:

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    addBottomSheetView()
}

Configure BottomSheetViewController

1) Prepare background

Create a method to add blur and vibrancy effects

func prepareBackgroundView(){
    let blurEffect = UIBlurEffect.init(style: .Dark)
    let visualEffect = UIVisualEffectView.init(effect: blurEffect)
    let bluredView = UIVisualEffectView.init(effect: blurEffect)
    bluredView.contentView.addSubview(visualEffect)

    visualEffect.frame = UIScreen.mainScreen().bounds
    bluredView.frame = UIScreen.mainScreen().bounds

    view.insertSubview(bluredView, atIndex: 0)
}

call this method in your viewWillAppear

override func viewWillAppear(animated: Bool) {
   super.viewWillAppear(animated)
   prepareBackgroundView()
}

Make sure that your controller's view background color is clearColor.

2) Animate bottomSheet appearance

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)

    UIView.animateWithDuration(0.3) { [weak self] in
        let frame = self?.view.frame
        let yComponent = UIScreen.mainScreen().bounds.height - 200
        self?.view.frame = CGRectMake(0, yComponent, frame!.width, frame!.height)
    }
}

3) Modify your xib as you want.

4) Add Pan Gesture Recognizer to your view.

In your viewDidLoad method add UIPanGestureRecognizer.

override func viewDidLoad() {
    super.viewDidLoad()

    let gesture = UIPanGestureRecognizer.init(target: self, action: #selector(BottomSheetViewController.panGesture))
    view.addGestureRecognizer(gesture)

}

And implement your gesture behaviour:

func panGesture(recognizer: UIPanGestureRecognizer) {
    let translation = recognizer.translationInView(self.view)
    let y = self.view.frame.minY
    self.view.frame = CGRectMake(0, y + translation.y, view.frame.width, view.frame.height)
     recognizer.setTranslation(CGPointZero, inView: self.view)
}

Scrollable Bottom Sheet:

If your custom view is a scroll view or any other view that inherits from, so you have two options:

First:

Design the view with a header view and add the panGesture to the header. (bad user experience).

Second:

1 - Add the panGesture to the bottom sheet view.

2 - Implement the UIGestureRecognizerDelegate and set the panGesture delegate to the controller.

3- Implement shouldRecognizeSimultaneouslyWith delegate function and disable the scrollView isScrollEnabled property in two case:

The view is partially visible.
The view is totally visible, the scrollView contentOffset property is 0 and the user is dragging the view downwards.

Otherwise enable scrolling.

  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
      let gesture = (gestureRecognizer as! UIPanGestureRecognizer)
      let direction = gesture.velocity(in: view).y

      let y = view.frame.minY
      if (y == fullView && tableView.contentOffset.y == 0 && direction > 0) || (y == partialView) {
          tableView.isScrollEnabled = false
      } else {
        tableView.isScrollEnabled = true
      }

      return false
  }

NOTE

In case you set .allowUserInteraction as an animation option, like in the sample project, so you need to enable scrolling on the animation completion closure if the user is scrolling up.

Sample Project

I created a sample project with more options on this repo which may give you better insights about how to customise the flow.

In the demo, addBottomSheetView() function controls which view should be used as a bottom sheet.

Sample Project Screenshots

- Partial View

- FullView

- Scrollable View

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

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

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

Either of those would cause your error.

Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError.

You asked if it is possible to change the circular dependency checking in those slf4j classes.

The simple answer is no.

It is unconditional ... as implemented.
It is implemented in a static initializer block ... so you can't override the implementation, and you can't stop it happening.

So the only way to change this would be to download the source code, modify the core classes to "fix" them, build and use them. That is probably a bad idea (in general) and probably not solution in this case; i.e. you risk triggering the stack overflow problem that the message warns about.

Reference:

The source code.

The real solution (as you identified in your Answer) is to use the right JARs. My understanding is that the circularity that was detected is real and potentially problematic ... and unnecessary.

Check whether a path is valid

private bool IsValidPath(string path)
{
    Regex driveCheck = new Regex(@"^[a-zA-Z]:\\$");

    if (string.IsNullOrWhiteSpace(path) || path.Length < 3)
    {
        return false;
    }

    if (!driveCheck.IsMatch(path.Substring(0, 3)))
    {
        return false;
    }

    var x1 = (path.Substring(3, path.Length - 3));
    string strTheseAreInvalidFileNameChars = new string(Path.GetInvalidPathChars());
    strTheseAreInvalidFileNameChars += @":?*";
    Regex containsABadCharacter = new Regex("[" + Regex.Escape(strTheseAreInvalidFileNameChars) + "]");

    if (containsABadCharacter.IsMatch(path.Substring(3, path.Length - 3)))
    {
        return false;
    }

    var driveLetterWithColonAndSlash = Path.GetPathRoot(path);

    if (!DriveInfo.GetDrives().Any(x => x.Name == driveLetterWithColonAndSlash))
    {
        return false;
    }

    return true;
}

Messages Using Command prompt in Windows 7

Open Notepad and write this

@echo off
:A
Cls
echo MESSENGER
set /p n=User:
set /p m=Message:
net send %n% %m%
Pause
Goto A

and then save as "Messenger.bat" and close the Notepad
Step 1:

when you open that saved notepad file it will open as a file Messenger command prompt with this details.

Messenger
User:

after "User" write the ip of the computer you want to contact and then press enter.

invalid use of non-static member function

You must make Foo::comparator static or wrap it in a std::mem_fun class object. This is because lower_bounds() expects the comparer to be a class of object that has a call operator, like a function pointer or a functor object. Also, if you are using C++11 or later, you can also do as dwcanillas suggests and use a lambda function. C++11 also has std::bind too.

Examples:

// Binding:
std::lower_bounds(first, last, value, std::bind(&Foo::comparitor, this, _1, _2));
// Lambda:
std::lower_bounds(first, last, value, [](const Bar & first, const Bar & second) { return ...; });

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

A warning about the Jquery Caret plugin.

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

How do I stop a web page from scrolling to the top when a link is clicked that triggers JavaScript?

You might want to check your CSS. In the example here: https://css-tricks.com/the-checkbox-hack/ there's position: absolute; top: -9999px;. This is particularly goofy on Chrome, as onclick="whatever" still jumps to the absolute position of the clicked element.

Removing position: absolute; top: -9999px;, for display: none; might help.

How to modify a text file?

The fileinput module of the Python standard library will rewrite a file inplace if you use the inplace=1 parameter:

import sys
import fileinput

# replace all occurrences of 'sit' with 'SIT' and insert a line after the 5th
for i, line in enumerate(fileinput.input('lorem_ipsum.txt', inplace=1)):
    sys.stdout.write(line.replace('sit', 'SIT'))  # replace 'sit' and write
    if i == 4: sys.stdout.write('\n')  # write a blank line after the 5th line

html select option separator

Instead of the regular hyphon I replaced it using a horizontal bar symbol from the extended character set, it won't look very nice if the user is in another country that replaces that character but works fine for me. There is a range of different chacters you could use for some great effects and there is no css involved.

<option value='-' disabled>----</option>

Convert PDF to clean SVG?

Bash script to convert each page of a PDF into its own SVG file.

#!/bin/bash
#
#  Make one PDF per page using PDF toolkit.
#  Convert this PDF to SVG using inkscape
#

inputPdf=$1

pageCnt=$(pdftk $inputPdf dump_data | grep NumberOfPages | cut -d " " -f 2)

for i in $(seq 1 $pageCnt); do
    echo "converting page $i..."
    pdftk ${inputPdf} cat $i output ${inputPdf%%.*}_${i}.pdf
    inkscape --without-gui "--file=${inputPdf%%.*}_${i}.pdf" "--export-plain-svg=${inputPdf%%.*}_${i}.svg"
done

To generate in png, use --export-png, etc...

Get the directory from a file path in java (android)

I have got solution on this after 4 days, Please note following points while giving path to File class in Android(Java):

Use path for internal storage String path="/storage/sdcard0/myfile.txt";
path="/storage/sdcard1/myfile.txt";
mention permissions in Manifest file.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
First check file length for confirmation.
Check paths in ES File Explorer regarding sdcard0 & sdcard1 is this same or else......

e.g.

File file=new File(path);
long=file.length();//in Bytes

Javascript add method to object

you need to add it to Foo's prototype:

function Foo(){}
Foo.prototype.bar = function(){}
var x = new Foo()
x.bar()

How to test the type of a thrown exception in Jest

From my (albeit limited) exposure to Jest, I have found that expect().toThrow() is suitable if you want to only test an error is thrown of a specific type:

expect(() => functionUnderTest()).toThrow(TypeError);

Or an error is thrown with a specific message:

expect(() => functionUnderTest()).toThrow('Something bad happened!');

If you try to do both, you will get a false positive. For example, if your code throws RangeError('Something bad happened!'), this test will pass:

expect(() => functionUnderTest()).toThrow(new TypeError('Something bad happened!'));

The answer by bodolsog which suggests using a try/catch is close, but rather than expecting true to be false to ensure the expect assertions in the catch are hit, you can instead use expect.assertions(2) at the start of your test where 2 is the number of expected assertions. I feel this more accurately describes the intention of the test.

A full example of testing the type and message of an error:

describe('functionUnderTest', () => {
    it('should throw a specific type of error.', () => {
        expect.assertions(2);

        try {
            functionUnderTest();
        } catch (error) {
            expect(error).toBeInstanceOf(TypeError);
            expect(error).toHaveProperty('message', 'Something bad happened!');
        }
    });
});

If functionUnderTest() does not throw an error, the assertions will be be hit, but the expect.assertions(2) will fail and the test will fail.

create a text file using javascript

Try this:

<SCRIPT LANGUAGE="JavaScript">
 function WriteToFile(passForm) {

    set fso = CreateObject("Scripting.FileSystemObject");  
    set s = fso.CreateTextFile("C:\test.txt", True);
    s.writeline("HI");
    s.writeline("Bye");
    s.writeline("-----------------------------");
    s.Close();
 }
  </SCRIPT>

</head>

<body>
<p>To sign up for the Excel workshop please fill out the form below:
</p>
<form onSubmit="WriteToFile(this)">
Type your first name:
<input type="text" name="FirstName" size="20">
<br>Type your last name:
<input type="text" name="LastName" size="20">
<br>
<input type="submit" value="submit">
</form>

This will work only on IE

Calling a stored procedure in Oracle with IN and OUT parameters

If you set the server output in ON mode before the entire code, it works, otherwise put_line() will not work. Try it!

The code is,

set serveroutput on;
CREATE OR REPLACE PROCEDURE PROC1(invoicenr IN NUMBER, amnt OUT NUMBER)
AS BEGIN
SELECT AMOUNT INTO amnt FROM INVOICE WHERE INVOICE_NR = invoicenr;
END;

And then call the function as it is:

DECLARE
amount NUMBER;
BEGIN
PROC1(1000001, amount);
dbms_output.put_line(amount);
END;

C compiler for Windows?

Cygwin offers full GCC support on Windows; also, the free Microsoft Visual C++ Express Edition supports 'legacy' C projects just fine.

AttributeError: 'module' object has no attribute 'urlopen'

Solution for python3:

from urllib.request import urlopen

url = 'http://www.python.org'
file = urlopen(url)
html = file.read()
print(html)

How can I loop through enum values for display in radio buttons?

Two options:

for (let item in MotifIntervention) {
    if (isNaN(Number(item))) {
        console.log(item);
    }
}

Object.keys(MotifIntervention).filter(key => !isNaN(Number(MotifIntervention[key])));

(code in playground)

Edit

String enums look different than regular ones, for example:

enum MyEnum {
    A = "a",
    B = "b",
    C = "c"
}

Compiles into:

var MyEnum;
(function (MyEnum) {
    MyEnum["A"] = "a";
    MyEnum["B"] = "b";
    MyEnum["C"] = "c";
})(MyEnum || (MyEnum = {}));

Which just gives you this object:

{
    A: "a",
    B: "b",
    C: "c"
}

You can get all the keys (["A", "B", "C"]) like this:

Object.keys(MyEnum);

And the values (["a", "b", "c"]):

Object.keys(MyEnum).map(key => MyEnum[key])

Or using Object.values():

Object.values(MyEnum)

Update one MySQL table with values from another

It depends what is a use of those tables, but you might consider putting trigger on original table on insert and update. When insert or update is done, update the second table based on only one item from the original table. It will be quicker.

Import local function from a module housed in another directory with relative imports in Jupyter Notebook using Python 3

I had almost the same example as you in this notebook where I wanted to illustrate the usage of an adjacent module's function in a DRY manner.

My solution was to tell Python of that additional module import path by adding a snippet like this one to the notebook:

import os
import sys
module_path = os.path.abspath(os.path.join('..'))
if module_path not in sys.path:
    sys.path.append(module_path)

This allows you to import the desired function from the module hierarchy:

from project1.lib.module import function
# use the function normally
function(...)

Note that it is necessary to add empty __init__.py files to project1/ and lib/ folders if you don't have them already.

Remove folder and its contents from git/GitHub's history

Complete copy&paste recipe, just adding the commands in the comments (for the copy-paste solution), after testing them:

git filter-branch --tree-filter 'rm -rf node_modules' --prune-empty HEAD
echo node_modules/ >> .gitignore
git add .gitignore
git commit -m 'Removing node_modules from git history'
git gc
git push origin master --force

After this, you can remove the line "node_modules/" from .gitignore

Specified cast is not valid?

From your comment:

this line DateTime Date = reader.GetDateTime(0); was throwing the exception

The first column is not a valid DateTime. Most likely, you have multiple columns in your table, and you're retrieving them all by running this query:

SELECT * from INFO

Replace it with a query that retrieves only the two columns you're interested in:

SELECT YOUR_DATE_COLUMN, YOUR_TIME_COLUMN from INFO

Then try reading the values again:

var Date = reader.GetDateTime(0);
var Time = reader.GetTimeSpan(1);  // equivalent to time(7) from your database

Or:

var Date = Convert.ToDateTime(reader["YOUR_DATE_COLUMN"]);
var Time = (TimeSpan)reader["YOUR_TIME_COLUMN"];

Python: Append item to list N times

You could do this with a list comprehension

l = [x for i in range(10)];

How to get anchor text/href on click using jQuery?

Note: Apply the class info_link to any link you want to get the info from.

<a class="info_link" href="~/Resumes/Resumes1271354404687.docx">
    ~/Resumes/Resumes1271354404687.docx
</a>

For href:

$(function(){
  $('.info_link').click(function(){
    alert($(this).attr('href'));
    // or alert($(this).hash();
  });
});

For Text:

$(function(){
  $('.info_link').click(function(){
    alert($(this).text());
  });
});

Update Based On Question Edit

You can get them like this now:

For href:

$(function(){
  $('div.res a').click(function(){
    alert($(this).attr('href'));
    // or alert($(this).hash();
  });
});

For Text:

$(function(){
  $('div.res a').click(function(){
    alert($(this).text());
  });
});

How to delete a folder in C++?

Delete folder (sub_folders and files) in Windows (VisualC++) not using Shell APIs, this is the best working sample:

#include <string>
#include <iostream>

#include <windows.h>
#include <conio.h>


int DeleteDirectory(const std::string &refcstrRootDirectory,
                    bool              bDeleteSubdirectories = true)
{
  bool            bSubdirectory = false;       // Flag, indicating whether
                                               // subdirectories have been found
  HANDLE          hFile;                       // Handle to directory
  std::string     strFilePath;                 // Filepath
  std::string     strPattern;                  // Pattern
  WIN32_FIND_DATA FileInformation;             // File information


  strPattern = refcstrRootDirectory + "\\*.*";
  hFile = ::FindFirstFile(strPattern.c_str(), &FileInformation);
  if(hFile != INVALID_HANDLE_VALUE)
  {
    do
    {
      if(FileInformation.cFileName[0] != '.')
      {
        strFilePath.erase();
        strFilePath = refcstrRootDirectory + "\\" + FileInformation.cFileName;

        if(FileInformation.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
        {
          if(bDeleteSubdirectories)
          {
            // Delete subdirectory
            int iRC = DeleteDirectory(strFilePath, bDeleteSubdirectories);
            if(iRC)
              return iRC;
          }
          else
            bSubdirectory = true;
        }
        else
        {
          // Set file attributes
          if(::SetFileAttributes(strFilePath.c_str(),
                                 FILE_ATTRIBUTE_NORMAL) == FALSE)
            return ::GetLastError();

          // Delete file
          if(::DeleteFile(strFilePath.c_str()) == FALSE)
            return ::GetLastError();
        }
      }
    } while(::FindNextFile(hFile, &FileInformation) == TRUE);

    // Close handle
    ::FindClose(hFile);

    DWORD dwError = ::GetLastError();
    if(dwError != ERROR_NO_MORE_FILES)
      return dwError;
    else
    {
      if(!bSubdirectory)
      {
        // Set directory attributes
        if(::SetFileAttributes(refcstrRootDirectory.c_str(),
                               FILE_ATTRIBUTE_NORMAL) == FALSE)
          return ::GetLastError();

        // Delete directory
        if(::RemoveDirectory(refcstrRootDirectory.c_str()) == FALSE)
          return ::GetLastError();
      }
    }
  }

  return 0;
}


int main()
{
  int         iRC                  = 0;
  std::string strDirectoryToDelete = "c:\\mydir";


  // Delete 'c:\mydir' without deleting the subdirectories
  iRC = DeleteDirectory(strDirectoryToDelete, false);
  if(iRC)
  {
    std::cout << "Error " << iRC << std::endl;
    return -1;
  }

  // Delete 'c:\mydir' and its subdirectories
  iRC = DeleteDirectory(strDirectoryToDelete);
  if(iRC)
  {
    std::cout << "Error " << iRC << std::endl;
    return -1;
  }

  // Wait for keystroke
  _getch();

  return 0;
}

Source: http://www.codeguru.com/forum/showthread.php?t=239271

Why, Fatal error: Class 'PHPUnit_Framework_TestCase' not found in ...?

The PHPUnit documentation ~~says~~ used to say to include/require PHPUnit/Framework.php, as follows:

require_once ('PHPUnit/Framework/TestCase.php');

UPDATE

As of PHPUnit 3.5, there is a built-in autoloader class that will handle this for you:

require_once 'PHPUnit/Autoload.php';

Thanks to Phoenix for pointing this out!

How can I convert a string to upper- or lower-case with XSLT?

XSLT 2.0 has upper-case() and lower-case() functions. In case of XSLT 1.0, you can use translate():

<xsl:value-of select="translate("xslt", "abcdefghijklmnopqrstuvwxyz", "ABCDEFGHIJKLMNOPQRSTUVWXYZ")" />

Android studio 3.0: Unable to resolve dependency for :app@dexOptions/compileClasspath': Could not resolve project :animators

It seems like it's a bug on Gradle. This solves the problem for me, but it's not a solution. We have to wait for a new version fixing this problems.

On build.gradle in the project set classpath 'com.android.tools.build:gradle:2.3.3' instead classpath 'com.android.tools.build:gradle:3.0.0'.

On gradle-wrapper.properties set https://services.gradle.org/distributions/gradle-3.3-all.zip instead https://services.gradle.org/distributions/gradle-4.1.2-all.zip

How to show live preview in a small popup of linked page on mouse over on link?

You could do the following:

Create (or find) a service that renders URLs as preview images
Load that image on mouse over and show it
If you are obsessive about being live, then use a Timer plug-in for jQuery to reload the image after some time

Of course this isn't actually live.

What would be more sensible is that you could generate preview images for certain URLs e.g. every day or every week and use them. I image that you don't want to do this manually and you don't want to show the users of your service a preview that looks completely different than what the site currently looks like.

jQuery UI Dialog Box - does not open after being closed

on the last line, don't use $(this).remove() use $(this).hide() instead.

EDIT: To clarify,on the close click event you're removing the #terms div from the DOM which is why its not coming back. You just need to hide it instead.

mean() warning: argument is not numeric or logical: returning NA

If you just want to know the mean, you can use

summary(results)

It will give you more information than expected.

ex) Mininum value, 1st Qu., Median, Mean, 3rd Qu. Maxinum value, number of NAs.

Furthermore, If you want to get mean values of each column, you can simply use the method below.

mean(results$columnName, na.rm = TRUE)

That will return mean value. (you have to change 'columnName' to your variable name

Convert Mongoose docs to json

model.find({Branch:branch},function (err, docs){
  if (err) res.send(err)

  res.send(JSON.parse(JSON.stringify(docs)))
});

Way to insert text having ' (apostrophe) into a SQL table

I know the question is aimed at the direct escaping of the apostrophe character but I assume that usually this is going to be triggered by some sort of program providing the input.

What I have done universally in the scripts and programs I have worked with is to substitute it with a ` character when processing the formatting of the text being input.

Now I know that in some cases, the backtick character may in fact be part of what you might be trying to save (such as on a forum like this) but if you're simply saving text input from users it's a possible solution.

Going into the SQL database

$newval=~s/\'/`/g;

Then, when coming back out for display, filtered again like this:

$showval=~s/`/\'/g;

This example was when PERL/CGI is being used but it can apply to PHP and other bases as well. I have found it works well because I think it helps prevent possible injection attempts, because all ' are removed prior to attempting an insertion of a record.

Show dialog from fragment?

For me, it was the following-

MyFragment:

public class MyFragment extends Fragment implements MyDialog.Callback
{
    ShowDialog activity_showDialog;

    @Override
    public void onAttach(Activity activity)
    {
        super.onAttach(activity);
        try
        {
            activity_showDialog = (ShowDialog)activity;
        }
        catch(ClassCastException e)
        {
            Log.e(this.getClass().getSimpleName(), "ShowDialog interface needs to be     implemented by Activity.", e);
            throw e;
        }
    }

    @Override
    public void onClick(View view) 
    {
        ...
        MyDialog dialog = new MyDialog();
        dialog.setTargetFragment(this, 1); //request code
        activity_showDialog.showDialog(dialog);
        ...
    }

    @Override
    public void accept()
    {
        //accept
    }

    @Override
    public void decline()
    {
        //decline
    }

    @Override
    public void cancel()
    {
        //cancel
    }

}

MyDialog:

public class MyDialog extends DialogFragment implements View.OnClickListener
{
    private EditText mEditText;
    private Button acceptButton;
    private Button rejectButton;
    private Button cancelButton;

    public static interface Callback
    {
        public void accept();
        public void decline();
        public void cancel();
    }

    public MyDialog()
    {
        // Empty constructor required for DialogFragment
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.dialogfragment, container);
        acceptButton = (Button) view.findViewById(R.id.dialogfragment_acceptbtn);
        rejectButton = (Button) view.findViewById(R.id.dialogfragment_rejectbtn);
        cancelButton = (Button) view.findViewById(R.id.dialogfragment_cancelbtn);
        acceptButton.setOnClickListener(this);
        rejectButton.setOnClickListener(this);
        cancelButton.setOnClickListener(this);
        getDialog().setTitle(R.string.dialog_title);
        return view;
    }

    @Override
    public void onClick(View v)
    {
        Callback callback = null;
        try
        {
            callback = (Callback) getTargetFragment();
        }
        catch (ClassCastException e)
        {
            Log.e(this.getClass().getSimpleName(), "Callback of this class must be implemented by target fragment!", e);
            throw e;
        }

        if (callback != null)
        {
            if (v == acceptButton)
            {   
                callback.accept();
                this.dismiss();
            }
            else if (v == rejectButton)
            {
                callback.decline();
                this.dismiss();
            }
            else if (v == cancelButton)
            {
                callback.cancel();
                this.dismiss();
            }
        }
    }
}

Activity:

public class MyActivity extends ActionBarActivity implements ShowDialog
{
    ..

    @Override
    public void showDialog(DialogFragment dialogFragment)
    {
        FragmentManager fragmentManager = getSupportFragmentManager();
        dialogFragment.show(fragmentManager, "dialog");
    }
}

DialogFragment layout:

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

    <TextView
        android:id="@+id/dialogfragment_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="10dp"
        android:text="@string/example"/>

    <Button
        android:id="@+id/dialogfragment_acceptbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_centerHorizontal="true"
        android:layout_below="@+id/dialogfragment_textview"
        android:text="@string/accept"
        />

    <Button
        android:id="@+id/dialogfragment_rejectbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_alignLeft="@+id/dialogfragment_acceptbtn"
        android:layout_below="@+id/dialogfragment_acceptbtn"
        android:text="@string/decline" />

     <Button
        android:id="@+id/dialogfragment_cancelbtn"
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="20dp"
        android:layout_alignLeft="@+id/dialogfragment_rejectbtn"
        android:layout_below="@+id/dialogfragment_rejectbtn"
        android:text="@string/cancel" />

     <Button
        android:id="@+id/dialogfragment_heightfixhiddenbtn"
        android:layout_width="200dp"
        android:layout_height="20dp"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="20dp"
        android:layout_alignLeft="@+id/dialogfragment_cancelbtn"
        android:layout_below="@+id/dialogfragment_cancelbtn"
        android:background="@android:color/transparent"
        android:enabled="false"
        android:text=" " />
</RelativeLayout>

As the name dialogfragment_heightfixhiddenbtn shows, I just couldn't figure out a way to fix that the bottom button's height was cut in half despite saying wrap_content, so I added a hidden button to be "cut" in half instead. Sorry for the hack.

Iterate keys in a C++ map

You could

create a custom iterator class, aggregating the std::map<K,V>::iterator
use std::transform of your map.begin() to map.end() with a boost::bind( &pair::second, _1 ) functor
just ignore the ->second member while iterating with a for loop.

Int to Char in C#

Although not exactly answering the question as formulated, but if you need or can take the end result as string you can also use

string s = Char.ConvertFromUtf32(56);

which will give you surrogate UTF-16 pairs if needed, protecting you if you are out side of the BMP.

How can I echo HTML in PHP?

Simply use the print function to echo text in the PHP file as follows:

<?php

  print('
    <div class="wrap">

      <span class="textClass">TESTING</span>

    </div>
  ')
?>

CSS pseudo elements in React

Depending if you only need a couple attributes to be styled inline you can do something like this solution (and saves you from having to install a special package or create an extra element):

https://stackoverflow.com/a/42000085

<span class="something" datacustomattribute="">
  Hello
</span>

.something::before {
  content: attr(datascustomattribute);
  position: absolute;
}

Note that the datacustomattribute must start with data and be all lowercase to satisfy React.

C++ - How to append a char to char*?

The specific problem is that you're declaring a new variable instead of assigning to an existing one:

char * ret = new char[strlen(array) + 1 + 1];
^^^^^^ Remove this

and trying to compare string values by comparing pointers:

if (array!="")     // Wrong - compares pointer with address of string literal
if (array[0] == 0) // Better - checks for empty string

although there's no need to make that comparison at all; the first branch will do the right thing whether or not the string is empty.

The more general problem is that you're messing around with nasty, error-prone C-style string manipulation in C++. Use std::string and it will manage all the memory allocation for you:

std::string appendCharToString(std::string const & s, char a) {
    return s + a;
}

Export to CSV using jQuery and html

I am not sure if the above CSV generation code is so great as it appears to skip th cells and also did not appear to allow for commas in the value. So here is my CSV generation code that might be useful.

It does assume you have the $table variable which is a jQuery object (eg. var $table = $('#yourtable');)

$rows = $table.find('tr');

var csvData = "";

for(var i=0;i<$rows.length;i++){
                var $cells = $($rows[i]).children('th,td'); //header or content cells

                for(var y=0;y<$cells.length;y++){
                    if(y>0){
                      csvData += ",";
                    }
                    var txt = ($($cells[y]).text()).toString().trim();
                    if(txt.indexOf(',')>=0 || txt.indexOf('\"')>=0 || txt.indexOf('\n')>=0){
                        txt = "\"" + txt.replace(/\"/g, "\"\"") + "\"";
                    }
                    csvData += txt;
                }
                csvData += '\n';
 }

How to execute a shell script from C in Linux?

I prefer fork + execlp for "more fine-grade" control as doron mentioned. Example code shown below.

Store you command in a char array parameters, and malloc space for the result.

int fd[2];
pipe(fd);
if ( (childpid = fork() ) == -1){
   fprintf(stderr, "FORK failed");
   return 1;
} else if( childpid == 0) {
   close(1);
   dup2(fd[1], 1);
   close(fd[0]);
   execlp("/bin/sh","/bin/sh","-c",parameters,NULL);
}
wait(NULL);
read(fd[0], result, RESULT_SIZE);
printf("%s\n",result);

Serializing an object to JSON

You're looking for JSON.stringify().

Navigate to another page with a button in angular 2

 <button type="button" class="btn btn-primary-outline pull-right" (click)="btnClick();"><i class="fa fa-plus"></i> Add</button>


import { Router } from '@angular/router';

btnClick= function () {
        this.router.navigate(['/user']);
};

Git status ignore line endings / identical files / windows & linux environment / dropbox / mled

I use both windows and linux, but the solution core.autocrlf true didn't help me. I even got nothing changed after git checkout <filename>.

So I use workaround to substitute git status - gitstatus.sh

#!/bin/bash

git status | grep modified | cut -d' ' -f 4 | while read x; do
 x1="$(git show HEAD:$x | md5sum | cut -d' ' -f 1 )"
 x2="$(cat $x | md5sum | cut -d' ' -f 1 )"

 if [ "$x1" != "$x2" ]; then
    echo "$x NOT IDENTICAL"
 fi
done

I just compare md5sum of a file and its brother at repository.

Example output:

$ ./gitstatus.sh
application/script.php NOT IDENTICAL
application/storage/logs/laravel.log NOT IDENTICAL

In an array of objects, fastest way to find the index of an object whose attributes match a search

Adapting Tejs's answer for mongoDB and Robomongo I changed

matchingIndices.push(j);

matchingIndices.push(NumberInt(j+1));

Convert Datetime column from UTC to local time in select statement

None of these worked for me but this below worked 100%. Hope this can help others trying to convert it like I was.

CREATE FUNCTION [dbo].[fn_UTC_to_EST]
(
    @UTC datetime,
    @StandardOffset int
)
RETURNS datetime
AS
BEGIN

declare 
    @DST datetime,
    @SSM datetime, -- Second Sunday in March
    @FSN datetime  -- First Sunday in November
-- get DST Range
set @SSM = DATEADD(dd,7 + (6-(DATEDIFF(dd,0,DATEADD(mm,(YEAR(GETDATE())-1900) * 12 + 2,0))%7)),DATEADD(mm,(YEAR(GETDATE())-1900) * 12 + 2,0))+'02:00:00' 
set @FSN = DATEADD(dd, (6-(DATEDIFF(dd,0,DATEADD(mm,(YEAR(GETDATE())-1900) * 12 + 10,0))%7)),DATEADD(mm,(YEAR(GETDATE())-1900) * 12 + 10,0)) +'02:00:00'

-- add an hour to @StandardOffset if @UTC is in DST range
if @UTC between @SSM and @FSN
    set @StandardOffset = @StandardOffset + 1

-- convert to DST
set @DST = dateadd(hour,@StandardOffset,@UTC)

-- return converted datetime
return @DST

END

Node/Express file upload

const http          = require('http');
const fs            = require('fs');

// https://www.npmjs.com/package/formidable
const formidable    = require('formidable');

// https://stackoverflow.com/questions/31317007/get-full-file-path-in-node-js
const path          = require('path');

router.post('/upload', (req, res) => {
    console.log(req.files);

    let oldpath = req.files.fileUploaded.path;

    // https://stackoverflow.com/questions/31317007/get-full-file-path-in-node-js       
    let newpath = path.resolve( `./${req.files.fileUploaded.name}` );

    // copy
    // https://stackoverflow.com/questions/43206198/what-does-the-exdev-cross-device-link-not-permitted-error-mean
    fs.copyFile( oldpath, newpath, (err) => {

        if (err) throw err;

        // delete
        fs.unlink( oldpath, (err) => {

            if (err) throw err;

            console.log('Success uploaded")
        } );                

    } );

});

Detect rotation of Android phone in the browser with JavaScript

I had the same problem. I am using Phonegap and Jquery mobile, for Adroid devices. To resize properly I had to set a timeout:

$(window).bind('orientationchange',function(e) {
  fixOrientation();
});

$(window).bind('resize',function(e) {
  fixOrientation();
});

function fixOrientation() {

    setTimeout(function() {

        var windowWidth = window.innerWidth;

        $('div[data-role="page"]').width(windowWidth);
        $('div[data-role="header"]').width(windowWidth);
        $('div[data-role="content"]').width(windowWidth-30);
        $('div[data-role="footer"]').width(windowWidth);

    },500);
}

Get the time difference between two datetimes

If we want only hh:mm:ss, we can use a function like that:

//param: duration in milliseconds
MillisecondsToTime: function(duration) {
    var seconds = parseInt((duration/1000)%60)
        , minutes = parseInt((duration/(1000*60))%60)
        , hours = parseInt((duration/(1000*60*60))%24)
        , days  = parseInt(duration/(1000*60*60*24));

    var hoursDays = parseInt(days*24);
    hours += hoursDays;
    hours = (hours < 10) ? "0" + hours : hours;
    minutes = (minutes < 10) ? "0" + minutes : minutes;
    seconds = (seconds < 10) ? "0" + seconds : seconds;
    return hours + ":" + minutes + ":" + seconds;
}

Grab a segment of an array in Java without creating a new array on heap

The Lists allow you to use and work with subList of something transparently. Primitive arrays would require you to keep track of some kind of offset - limit. ByteBuffers have similar options as I heard.

Edit: If you are in charge of the useful method, you could just define it with bounds (as done in many array related methods in java itself:

doUseful(byte[] arr, int start, int len) {
    // implementation here
}
doUseful(byte[] arr) {
    doUseful(arr, 0, arr.length);
}

It's not clear, however, if you work on the array elements themselves, e.g. you compute something and write back the result?

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2. Object properties

Non-justifiable use cases, with discussion

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4. get_defined_vars and compact

4a. Variable variables ($$foo)

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Regex to replace multiple spaces with a single space

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4a. Variable variables (`$$foo`)

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What's the difference between " " and " "?