Leader Not Available Kafka in Console Producer

For me, I didn't specify broker id for Kafka instance. It will get a new id from zookeeper sometimes when it restarts in Docker environment. If your broker id is greater than 1000, just specify the environment variable KAFKA_BROKER_ID.

Use this to see brokers, topics and partitions.

brew install kafkacat
kafkacat -b [kafka_ip]:[kafka_poot] -L

javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25

Just look at this solution, make sure you've turned access on to less secure apps on your google account :javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25

How can I show the table structure in SQL Server query?

Another way is,

mysql > SHOW CREATE TABLE my_db.my_table;

You should get the table name and create table sql

Removing "bullets" from unordered list <ul>

In your css file add following.

ul{
 list-style-type: none;
}

How to make a 3-level collapsing menu in Bootstrap?

Bootstrap 3 dropped native support for nested collapsing menus, but there's a way to re-enable it with a 3rd party script. It's called SmartMenus. It means adding three new resources to your page, but it seamlessly supports Bootstrap 3.x with multiple levels of menus for nested <ul>/<li> elements with class="dropdown-menu". It automatically displays the proper caret indicator as well.

<head>
   ...
   <script src=".../jquery.smartmenus.min.js"></script>
   <script src=".../jquery.smartmenus.bootstrap.min.js"></script>
   ...
   <link rel="stylesheet" href=".../jquery.smartmenus.bootstrap.min.css"/>
   ...
</head>

Here's a demo page: http://vadikom.github.io/smartmenus/src/demo/bootstrap-navbar-fixed-top.html

Parsing JSON objects for HTML table

You can use simple jQuery jPut plugin

http://plugins.jquery.com/jput/

<script>
$(document).ready(function(){

var json = [{"name": "name1","score":"30"},{"name": "name2","score":"50"}];
//while running this code the template will be appended in your div with json data
$("#tbody").jPut({
    jsonData:json,
    //ajax_url:"youfile.json",  if you want to call from a json file
    name:"tbody_template",
});

});
</script>   

<div jput="tbody_template">
 <tr>
  <td>{{name}}</td>
  <td>{{score}}</td>
 </tr>
</div>

<table>
 <tbody id="tbody">
 </tbody>
</table>

Using SELECT result in another SELECT

What you are looking for is a query with WITH clause, if your dbms supports it. Then

WITH NewScores AS (
    SELECT * 
    FROM Score  
    WHERE InsertedDate >= DATEADD(mm, -3, GETDATE())
)
SELECT 
<and the rest of your query>
;

Note that there is no ; in the first half. HTH.

Use getElementById on HTMLElement instead of HTMLDocument

Sub Scrape()
    Dim Browser As InternetExplorer
    Dim Document As htmlDocument
    Dim Elements As IHTMLElementCollection
    Dim Element As IHTMLElement

    Set Browser = New InternetExplorer
    Browser.Visible = True
    Browser.navigate "http://www.stackoverflow.com"

    Do While Browser.Busy And Not Browser.readyState = READYSTATE_COMPLETE
        DoEvents
    Loop

    Set Document = Browser.Document

    Set Elements = Document.getElementById("hmenus").getElementsByTagName("li")
    For Each Element In Elements
        Debug.Print Element.innerText
        'Questions
        'Tags
        'Users
        'Badges
        'Unanswered
        'Ask Question
    Next Element

    Set Document = Nothing
    Set Browser = Nothing
End Sub

Display Images Inline via CSS

Place this css in your page:

<style>
   #client_logos {
    display: inline-block;
    width:100%;
    }
  </style>

Replace

<p><img class="alignnone" style="display: inline; margin: 0 10px;" title="heartica_logo" src="https://s3.amazonaws.com/rainleader/assets/heartica_logo.png" alt="" width="150" height="50" /><img class="alignnone" style="display: inline; margin: 0 10px;" title="mouseflow_logo" src="https://s3.amazonaws.com/rainleader/assets/mouseflow_logo.png" alt="" width="150" height="50" /><img class="alignnone" style="display: inline; margin: 0 10px;" title="mouseflow_logo" src="https://s3.amazonaws.com/rainleader/assets/piiholo_logo.png" alt="" width="150" height="50" /></p>

<div id="client_logos">
<img style="display: inline; margin: 0 5px;" title="heartica_logo" src="https://s3.amazonaws.com/rainleader/assets/heartica_logo.png" alt="" width="150" height="50" />
<img style="display: inline; margin: 0 5px;" title="mouseflow_logo" src="https://s3.amazonaws.com/rainleader/assets/mouseflow_logo.png" alt="" width="150" height="50" />
<img style="display: inline; margin: 0 5px;" title="piiholo_logo" src="https://s3.amazonaws.com/rainleader/assets/piiholo_logo.png" alt="" width="150" height="50" />
</div>

How to Set Selected value in Multi-Value Select in Jquery-Select2.?

var valoresArea=VALUES
// it has the multiple values to set separated by comma
var arrayArea = valoresArea.split(',');
$('#area').select2('val',arrayArea);

Get Selected value from Multi-Value Select Boxes by jquery-select2?

Returns the selected data in structure of object:

console.log($(".leaderMultiSelctdropdown").select2('data'));

Something like:

   [{id:"1",text:"Text",disabled:false,selected:true},{id:"2",text:"Text2",disabled:false,selected:true}]

Returns the selected val:

console.log($('.leaderMultiSelctdropdown').val());
console.log($('.leaderMultiSelctdropdown').select2("val"));

Something like:

["1", "2"]

To compare two elements(string type) in XSLT?

First of all, the provided long code:

    <xsl:choose>
        <xsl:when test="OU_NAME='OU_ADDR1'">   --comparing two elements coming from XML             
            <!--remove if  adrees already contain  operating unit name <xsl:value-of select="OU_NAME"/> <fo:block/>-->
            <xsl:if test="OU_ADDR1 !='' ">
                <xsl:value-of select="OU_ADDR1"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR2 !='' ">
                <xsl:value-of select="OU_ADDR2"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR3 !='' ">
                <xsl:value-of select="OU_ADDR3"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="OU_TOWN_CITY !=''">
                <xsl:value-of select="OU_TOWN_CITY"/>,
                <fo:leader leader-pattern="space" leader-length="2.0pt"/>
            </xsl:if>
            <xsl:value-of select="OU_REGION2"/>
            <fo:leader leader-pattern="space" leader-length="3.0pt"/>
            <xsl:value-of select="OU_POSTALCODE"/>
            <fo:block/>
            <xsl:value-of select="OU_COUNTRY"/>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="OU_NAME"/>
            <fo:block/>
            <xsl:if test="OU_ADDR1 !='' ">
                <xsl:value-of select="OU_ADDR1"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR2 !='' ">
                <xsl:value-of select="OU_ADDR2"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR3 !='' ">
                <xsl:value-of select="OU_ADDR3"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="OU_TOWN_CITY !=''">
                <xsl:value-of select="OU_TOWN_CITY"/>,
                <fo:leader leader-pattern="space" leader-length="2.0pt"/>
            </xsl:if>
            <xsl:value-of select="OU_REGION2"/>
            <fo:leader leader-pattern="space" leader-length="3.0pt"/>
            <xsl:value-of select="OU_POSTALCODE"/>
            <fo:block/>
            <xsl:value-of select="OU_COUNTRY"/>
        </xsl:otherwise>
    </xsl:choose>

is equivalent to this, much shorter code:

<xsl:if test="not(OU_NAME='OU_ADDR1)'">
              <xsl:value-of select="OU_NAME"/>
        </xsl:if>
            <xsl:if test="OU_ADDR1 !='' ">
                <xsl:value-of select="OU_ADDR1"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR2 !='' ">
                <xsl:value-of select="OU_ADDR2"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="LE_ADDR3 !='' ">
                <xsl:value-of select="OU_ADDR3"/>
                <fo:block/>
            </xsl:if>
            <xsl:if test="OU_TOWN_CITY !=''">
                <xsl:value-of select="OU_TOWN_CITY"/>,
                <fo:leader leader-pattern="space" leader-length="2.0pt"/>
            </xsl:if>
            <xsl:value-of select="OU_REGION2"/>
            <fo:leader leader-pattern="space" leader-length="3.0pt"/>
            <xsl:value-of select="OU_POSTALCODE"/>
            <fo:block/>
            <xsl:value-of select="OU_COUNTRY"/>

Now, to your question:

how to compare two elements coming from xml as string

In Xpath 1.0 strings can be compared only for equality (or inequality), using the operator = and the function not() together with the operator =.

$str1 = $str2

evaluates to true() exactly when the string $str1 is equal to the string $str2.

not($str1 = $str2)

evaluates to true() exactly when the string $str1 is not equal to the string $str2.

There is also the != operator. It generally should be avoided because it has anomalous behavior whenever one of its operands is a node-set.

Now, the rules for comparing two element nodes are similar:

$el1 = $el2

evaluates to true() exactly when the string value of $el1 is equal to the string value of $el2.

not($el1 = $el2)

evaluates to true() exactly when the string value of $el1 is not equal to the string value of $el2.

However, if one of the operands of = is a node-set, then

 $ns = $str

evaluates to true() exactly when there is at least one node in the node-set $ns1, whose string value is equal to the string $str

$ns1 = $ns2

evaluates to true() exactly when there is at least one node in the node-set $ns1, whose string value is equal to the string value of some node from $ns2

Therefore, the expression:

OU_NAME='OU_ADDR1'

evaluates to true() only when there is at least one element child of the current node that is named OU_NAME and whose string value is the string 'OU_ADDR1'.

This is obviously not what you want!

Most probably you want:

OU_NAME=OU_ADDR1

This expression evaluates to true exactly there is at least one OU_NAME child of the current node and one OU_ADDR1 child of the current node with the same string value.

Finally, in XPath 2.0, strings can be compared also using the value comparison operators lt, le, eq, gt, ge and the inherited from XPath 1.0 general comparison operator =.

Trying to evaluate a value comparison operator when one or both of its arguments is a sequence of more than one item results in error.

Trigger back-button functionality on button click in Android

Well the answer from @sahhhm didn't work for me, what i needed was to trigger the backKey from a custom button so what I did was I simply called,

backAction.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                MyRides.super.onBackPressed();

            }
});

and it work like charm. Hope it will help others too.

org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

what i have experienced is that this exception raise when updating object have an id which not exist in table. if you read exception message it says "Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1" which means it was unable to found record with your given id.

To avoid this i always read record with same id if i found record back then i call update otherwise throw "exception record not found".

What is the purpose of the : (colon) GNU Bash builtin?

Self-documenting functions

You can also use : to embed documentation in a function.

Assume you have a library script mylib.sh, providing a variety of functions. You could either source the library (. mylib.sh) and call the functions directly after that (lib_function1 arg1 arg2), or avoid cluttering your namespace and invoke the library with a function argument (mylib.sh lib_function1 arg1 arg2).

Wouldn't it be nice if you could also type mylib.sh --help and get a list of available functions and their usage, without having to manually maintain the function list in the help text?

#!/bin/bash

# all "public" functions must start with this prefix
LIB_PREFIX='lib_'

# "public" library functions
lib_function1() {
    : This function does something complicated with two arguments.
    :
    : Parameters:
    : '   arg1 - first argument ($1)'
    : '   arg2 - second argument'
    :
    : Result:
    : "   it's complicated"

    # actual function code starts here
}

lib_function2() {
    : Function documentation

    # function code here
}

# help function
--help() {
    echo MyLib v0.0.1
    echo
    echo Usage: mylib.sh [function_name [args]]
    echo
    echo Available functions:
    declare -f | sed -n -e '/^'$LIB_PREFIX'/,/^}$/{/\(^'$LIB_PREFIX'\)\|\(^[ \t]*:\)/{
        s/^\('$LIB_PREFIX'.*\) ()/\n=== \1 ===/;s/^[ \t]*: \?['\''"]\?/    /;s/['\''"]\?;\?$//;p}}'
}

# main code
if [ "${BASH_SOURCE[0]}" = "${0}" ]; then
    # the script was executed instead of sourced
    # invoke requested function or display help
    if [ "$(type -t - "$1" 2>/dev/null)" = function ]; then
        "$@"
    else
        --help
    fi
fi

A few comments about the code:

All "public" functions have the same prefix. Only these are meant to be invoked by the user, and to be listed in the help text.
The self-documenting feature relies on the previous point, and uses declare -f to enumerate all available functions, then filters them through sed to only display functions with the appropriate prefix.
It is a good idea to enclose the documentation in single quotes, to prevent undesired expansion and whitespace removal. You'll also need to be careful when using apostrophes/quotes in the text.
You could write code to internalize the library prefix, i.e. the user only has to type mylib.sh function1 and it gets translated internally to lib_function1. This is an exercise left to the reader.
The help function is named "--help". This is a convenient (i.e. lazy) approach that uses the library invoke mechanism to display the help itself, without having to code an extra check for $1. At the same time, it will clutter your namespace if you source the library. If you don't like that, you can either change the name to something like lib_help or actually check the args for --help in the main code and invoke the help function manually.

Git Commit Messages: 50/72 Formatting

Separation of presentation and data drives my commit messages here.

Your commit message should not be hard-wrapped at any character count and instead line breaks should be used to separate thoughts, paragraphs, etc. as part of the data, not the presentation. In this case, the "data" is the message you are trying to get across and the "presentation" is how the user sees that.

I use a single summary line at the top and I try to keep it short but I don't limit myself to an arbitrary number. It would be far better if Git actually provided a way to store summary messages as a separate entity from the message but since it doesn't I have to hack one in and I use the first line break as the delimiter (luckily, many tools support this means of breaking apart the data).

For the message itself newlines indicate something meaningful in the data. A single newline indicates a start/break in a list and a double newline indicates a new thought/idea.

This is a summary line, try to keep it short and end with a line break.
This is a thought, perhaps an explanation of what I have done in human readable format.  It may be complex and long consisting of several sentences that describe my work in essay format.  It is not up to me to decide now (at author time) how the user is going to consume this data.

Two line breaks separate these two thoughts.  The user may be reading this on a phone or a wide screen monitor.  Have you ever tried to read 72 character wrapped text on a device that only displays 60 characters across?  It is a truly painful experience.  Also, the opening sentence of this paragraph (assuming essay style format) should be an intro into the paragraph so if a tool chooses it may want to not auto-wrap and let you just see the start of each paragraph.  Again, it is up to the presentation tool not me (a random author at some point in history) to try to force my particular formatting down everyone else's throat.

Just as an example, here is a list of points:
* Point 1.
* Point 2.
* Point 3.

Here's what it looks like in a viewer that soft wraps the text.

This is a summary line, try to keep it short and end with a line break.

This is a thought, perhaps an explanation of what I have done in human readable format. It may be complex and long consisting of several sentences that describe my work in essay format. It is not up to me to decide now (at author time) how the user is going to consume this data.

Two line breaks separate these two thoughts. The user may be reading this on a phone or a wide screen monitor. Have you ever tried to read 72 character wrapped text on a device that only displays 60 characters across? It is a truly painful experience. Also, the opening sentence of this paragraph (assuming essay style format) should be an intro into the paragraph so if a tool chooses it may want to not auto-wrap and let you just see the start of each paragraph. Again, it is up to the presentation tool not me (a random author at some point in history) to try to force my particular formatting down everyone else's throat.

Just as an example, here is a list of points:
* Point 1.
* Point 2.
* Point 3.

My suspicion is that the author of Git commit message recommendation you linked has never written software that will be consumed by a wide array of end-users on different devices before (i.e., a website) since at this point in the evolution of software/computing it is well known that storing your data with hard-coded presentation information is a bad idea as far as user experience goes.

What is the <leader> in a .vimrc file?

In my system its the \ key. it's used for commands so that you can combine it with other chars.

What is the best or most commonly used JMX Console / Client

Alternatively, constructing a JMX console yourself doesn't need to be hard. Just plug in Jolokia and create a web page getting the attributes that you're interested in. Admittedly, it doesn't allow you to do trend analysis, but it does allow you to construct something that is really geared towards your purpose.

I constructed something in just a few lines: http://nxt.flotsam.nl/ears-and-eyes.html

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

I have got this error on open page from Google Cache.

I think, cached page(client) disconnecting on page loading.

You can ignore this error log with try-catch on filter.

What's causing my java.net.SocketException: Connection reset?

I was getting exactly that error too: Connection reset by peer. The exception was being raised by Spring's REST template upon running the postForObject() method. For me the problem was too long HTTP URL request. So first check whether the URL produced is what it should be and, if your server really should be able to handle requests of that length, simply go to server's configuration and raise the default allowed length of URL requests.

That solved the problem for me, but be aware: the application might not run on some internet browsers, especially old ones, as they have fixed max length of URL requests.

Hope it helps...

Top 5 Mobile App Development Companies In the UK 2024

Simple Pivot Table to Count Unique Values

UPDATE: You can do this now automatically with Excel 2013. I've created this as a new answer because my previous answer actually solves a slightly different problem.

If you have that version, then select your data to create a pivot table, and when you create your table, make sure the option 'Add this data to the Data Model' tickbox is check (see below).

Tick the box next to 'Add this data to the Data Model'

Then, when your pivot table opens, create your rows, columns and values normally. Then click the field you want to calculate the distinct count of and edit the Field Value Settings: Edit field value settings

Finally, scroll down to the very last option and choose 'Distinct Count.' Choose the option 'Distinct Count'

This should update your pivot table values to show the data you're looking for.

Exception in thread "main" java.lang.Error: Unresolved compilation problems

You have to Import the Scanner and Timer Package Properly using the java.util classes.

import java.util.Scanner;
import java.util.Timer;

vba pass a group of cells as range to function

As written, your function accepts only two ranges as arguments.

To allow for a variable number of ranges to be used in the function, you need to declare a ParamArray variant array in your argument list. Then, you can process each of the ranges in the array in turn.

For example,

Function myAdd(Arg1 As Range, ParamArray Args2() As Variant) As Double
    Dim elem As Variant
    Dim i As Long
    For Each elem In Arg1
        myAdd = myAdd + elem.Value
    Next elem
    For i = LBound(Args2) To UBound(Args2)
        For Each elem In Args2(i)
            myAdd = myAdd + elem.Value
        Next elem
    Next i
End Function

This function could then be used in the worksheet to add multiple ranges.

myAdd usage

For your function, there is the question of which of the ranges (or cells) that can passed to the function are 'Sessions' and which are 'Customers'.

The easiest case to deal with would be if you decided that the first range is Sessions and any subsequent ranges are Customers.

Function calculateIt(Sessions As Range, ParamArray Customers() As Variant) As Double
    'This function accepts a single Sessions range and one or more Customers
    'ranges
    Dim i As Long
    Dim sessElem As Variant
    Dim custElem As Variant
    For Each sessElem In Sessions
        'do something with sessElem.Value, the value of each
        'cell in the single range Sessions
        Debug.Print "sessElem: " & sessElem.Value
    Next sessElem
    'loop through each of the one or more ranges in Customers()
    For i = LBound(Customers) To UBound(Customers)
        'loop through the cells in the range Customers(i)
        For Each custElem In Customers(i)
            'do something with custElem.Value, the value of
            'each cell in the range Customers(i)
            Debug.Print "custElem: " & custElem.Value
         Next custElem
    Next i
End Function

If you want to include any number of Sessions ranges and any number of Customers range, then you will have to include an argument that will tell the function so that it can separate the Sessions ranges from the Customers range.

This argument could be set up as the first, numeric, argument to the function that would identify how many of the following arguments are Sessions ranges, with the remaining arguments implicitly being Customers ranges. The function's signature would then be:

Function calculateIt(numOfSessionRanges, ParamAray Args() As Variant)

Or it could be a "guard" argument that separates the Sessions ranges from the Customers ranges. Then, your code would have to test each argument to see if it was the guard. The function would look like:

Function calculateIt(ParamArray Args() As Variant)

Perhaps with a call something like:

calculateIt(sessRange1,sessRange2,...,"|",custRange1,custRange2,...)

The program logic might then be along the lines of:

Function calculateIt(ParamArray Args() As Variant) As Double
   ...
   'loop through Args
   IsSessionArg = True
   For i = lbound(Args) to UBound(Args)
       'only need to check for the type of the argument
       If TypeName(Args(i)) = "String" Then
          IsSessionArg = False
       ElseIf IsSessionArg Then
          'process Args(i) as Session range
       Else
          'process Args(i) as Customer range
       End if
   Next i
   calculateIt = <somevalue>
End Function

Cannot implicitly convert type 'int?' to 'int'.

Your method's return type is int and you're trying to return an int?.

Submitting a multidimensional array via POST with php

On submitting, you would get an array as if created like this:

$_POST['topdiameter'] = array( 'first value', 'second value' );
$_POST['bottomdiameter'] = array( 'first value', 'second value' );

However, I would suggest changing your form names to this format instead:

name="diameters[0][top]"
name="diameters[0][bottom]"
name="diameters[1][top]"
name="diameters[1][bottom]"
...

Using that format, it's much easier to loop through the values.

if ( isset( $_POST['diameters'] ) )
{
    echo '<table>';
    foreach ( $_POST['diameters'] as $diam )
    {
        // here you have access to $diam['top'] and $diam['bottom']
        echo '<tr>';
        echo '  <td>', $diam['top'], '</td>';
        echo '  <td>', $diam['bottom'], '</td>';
        echo '</tr>';
    }
    echo '</table>';
}

Box-Shadow on the left side of the element only

This question is very, very, very old, but as a trick in the future, I recommend something like this:

.element{
    box-shadow: 0px 0px 10px #232931;
}
.container{
    height: 100px;
    width: 100px;
    overflow: hidden;
}

Basically, you have a box shadow and then wrapping the element in a div with its overflow set to hidden. You'll need to adjust the height, width, and even padding of the div to only show the left box shadow, but it works. See here for an example If you look at the example, you can see how there's no other shadows, but only a black left shadow. Edit: this is a retake of the same screen shot, in case some one thinks that I just cropped out the right. You can find it here

How can I calculate an md5 checksum of a directory?

A solution which worked best for me:

find "$path" -type f -print0 | sort -z | xargs -r0 md5sum | md5sum

Reason why it worked best for me:

handles file names containing spaces
Ignores filesystem meta-data
Detects if file has been renamed

Issues with other answers:

Filesystem meta-data is not ignored for:

tar c - "$path" | md5sum

Does not handle file names containing spaces nor detects if file has been renamed:

find /path -type f | sort -u | xargs cat | md5sum

How to log cron jobs?

By default cron logs to /var/log/syslog so you can see cron related entries by using:

grep CRON /var/log/syslog

https://askubuntu.com/questions/56683/where-is-the-cron-crontab-log

How do you get centered content using Twitter Bootstrap?

If you use Bootstrap 3, it also has built-in CSS class named .text-center. That's what you want.

<div class="text-left">
    left
</div>

<div class="text-center">
    center
</div>

<div class="text-right">
    right
</div>

Please see the example in jsfiddle. http://jsfiddle.net/ucheng/Q4Fue/

Create Test Class in IntelliJ

Right click on project then select new->directory. Create a new directory and name it "test".
Right click on "test" folder then select Mark Directory As->Test Sources Root
Click on Navigate->Test->Create New Test
Select Testing library(JUnit4 or any)
Specify Class Name
Select Member

That's it. We can modify the directory structure as per our need. Good luck!

How to programmatically send SMS on the iPhone?

Follow this procedures

1 .Add MessageUI.Framework to project enter image description here

2 . Import #import <MessageUI/MessageUI.h> in .h file.

3 . Copy this code for sending message

 if ([MFMessageComposeViewController canSendText]) {
    MFMessageComposeViewController *messageComposer =
    [[MFMessageComposeViewController alloc] init];
    NSString *message = @"Message!!!";
    [messageComposer setBody:message];
    messageComposer.messageComposeDelegate = self;
    [self presentViewController:messageComposer animated:YES completion:nil];
}

4 . Implement delegate method if you want to.

- (void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result{


   ///your stuff here 

    [self dismissViewControllerAnimated:YES completion:nil];
}

Run And GO!

How to use an arraylist as a prepared statement parameter

@JulienD Best way is to break above process into two steps.

Step 1 : Lets say 'rawList' as your list that you want to add as parameters in prepared statement.

Create another list :

ArrayList<String> listWithQuotes = new ArrayList<String>();

for(String element : rawList){
    listWithQuotes.add("'"+element+"'");
}

Step 2 : Make 'listWithQuotes' comma separated.

String finalString = StringUtils.join(listWithQuotes.iterator(),",");

'finalString' will be string parameters with each element as single quoted and comma separated.

if arguments is equal to this string, define a variable like this string

You can use either "=" or "==" operators for string comparison in bash. The important factor is the spacing within the brackets. The proper method is for brackets to contain spacing within, and operators to contain spacing around. In some instances different combinations work; however, the following is intended to be a universal example.

if [ "$1" == "something" ]; then     ## GOOD

if [ "$1" = "something" ]; then      ## GOOD

if [ "$1"="something" ]; then        ## BAD (operator spacing)

if ["$1" == "something"]; then       ## BAD (bracket spacing)

Also, note double brackets are handled slightly differently compared to single brackets ...

if [[ $a == z* ]]; then   # True if $a starts with a "z" (pattern matching).
if [[ $a == "z*" ]]; then # True if $a is equal to z* (literal matching).

if [ $a == z* ]; then     # File globbing and word splitting take place.
if [ "$a" == "z*" ]; then # True if $a is equal to z* (literal matching).

I hope that helps!

How do HashTables deal with collisions?

There are multiple techniques available to handle collision. I will explain some of them

Chaining: In chaining we use array indexes to store the values. If hash code of second value also points to the same index then we replace that index value with an linked list and all values pointing to that index are stored in the linked list and actual array index points to the head of the the linked list. But if there is only one hash code pointing to an index of array then the value is directly stored in that index. Same logic is applied while retrieving the values. This is used in Java HashMap/Hashtable to avoid collisions.

Linear probing: This technique is used when we have more index in the table than the values to be stored. Linear probing technique works on the concept of keep incrementing until you find an empty slot. The pseudo code looks like this:

index = h(k) 

while( val(index) is occupied) 

index = (index+1) mod n

Double hashing technique: In this technique we use two hashing functions h1(k) and h2(k). If the slot at h1(k) is occupied then the second hashing function h2(k) used to increment the index. The pseudo-code looks like this:

index = h1(k)

while( val(index) is occupied)

index = (index + h2(k)) mod n

Linear probing and double hashing techniques are part of open addressing technique and it can only be used if available slots are more than the number of items to be added. It takes less memory than chaining because there is no extra structure used here but its slow because of lot of movement happen until we find an empty slot. Also in open addressing technique when an item is removed from a slot we put an tombstone to indicate that the item is removed from here that is why its empty.

For more information see this site.

"multiple target patterns" Makefile error

I just want to add, if you get this error because you are using Cygwin make and auto-generated files, you can fix it with the following sed,

sed -e 's@\\\([^ ]\)@/\1@g' -e 's@[cC]:@/cygdrive/c@' -i filename.d

You may need to add more characters than just space to the escape list in the first substitution but you get the idea. The concept here is that /cygdrive/c is an alias for c: that cygwin's make will recognize.

And may as well throw in

-e 's@^ \+@\t@'

just in case you did start with spaces on accident (although I /think/ this will usually be a "missing separator" error).

How does HttpContext.Current.User.Identity.Name know which usernames exist?

The HttpContext.Current.User.Identity.Name returns null

This depends on whether the authentication mode is set to Forms or Windows in your web.config file.

For example, if I write the authentication like this:

<authentication mode="Forms"/>

Then because the authentication mode="Forms", I will get null for the username. But if I change the authentication mode to Windows like this:

<authentication mode="Windows"/>

I can run the application again and check for the username, and I will get the username successfully.

For more information, see System.Web.HttpContext.Current.User.Identity.Name Vs System.Environment.UserName in ASP.NET.

android ellipsize multiline textview

There's no need to do extra codes in java just do this:

<TextView
    android:id="@+id/productDescription"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:maxLines="4"
    android:ellipsize="end"
    android:singleLine="false"
    android:text="Vehicle Compatibility (Brand/Model) - Hero Ez, Hero Maestro, Hero Pleasure, Honda Activa, Honda Dio, Piaggio Vespa, Suzuki Access, Suzuki Swish, Yamaha Alpha, Yamaha Fascino, Yamaha Ray\nFeatures: Higher NSD with Connected Blocks, Continuous centre Groove, Deeper Shoulder Grooves and Sipes on the tread Blocks\nFunctions: More rubber to wear ; Construction Type: Bias ; Grip: Excellent Dry &amp; Wet Grip ; Functions:Functions: More rubber to wear Better mass transfer, More 'biting' edges to Grip on or Off road" />

Screenshot:

Swipe to Delete and the "More" button (like in Mail app on iOS 7)

You need to subclass UITableViewCell and subclass method willTransitionToState:(UITableViewCellStateMask)state which is called whenever user swipes the cell. The state flags will let you know if the Delete button is showing, and show/hide your More button there.

Unfortunately this method gives you neither the width of the Delete button nor the animation time. So you need to observer & hard-code your More button's frame and animation time into your code (I personally think Apple needs to do something about this).

How can I get the latest JRE / JDK as a zip file rather than EXE or MSI installer?

http://androidhost.org/D8wsv

You can get jre-7u75-windows-i586.zip from the link above.

How can I use a carriage return in a HTML tooltip?

I don't believe it is. Firefox 2 trims long link titles anyway and they should really only be used to convey a small amount of help text. If you need more explanation text I would suggest that it belongs in a paragraph associated with the link. You could then add the tooltip javascript code to hide those paragraphs and show them as tooltips on hover. That's your best bet for getting it to work cross-browser IMO.

"401 Unauthorized" on a directory

Another simple fix I found was to delete the local IIS site (from within IIS Manager) and then re-create the virtual directory from the "Properties" of your web project in Visual Studio.

How do I pass a variable to the layout using Laravel' Blade templating?

if you want to get the variables of sections you can pay like this:

$_view      = new \View;
$_sections  = $_view->getFacadeRoot()->getSections();
dd($_sections);
/*
Out:
array:1 [?
  "title" => "Painel"
]
*/

Escape string for use in Javascript regex

Short 'n Sweet

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}

Example

escapeRegExp("All of these should be escaped: \ ^ $ * + ? . ( ) | { } [ ]");

>>> "All of these should be escaped: \\ \^ \$ \* \+ \? \. \( \) \| \{ \} \[ \] "

(NOTE: the above is not the original answer; it was edited to show the one from MDN. This means it does not match what you will find in the code in the below npm, and does not match what is shown in the below long answer. The comments are also now confusing. My recommendation: use the above, or get it from MDN, and ignore the rest of this answer. -Darren,Nov 2019)

Install

Available on npm as escape-string-regexp

npm install --save escape-string-regexp

Note

See MDN: Javascript Guide: Regular Expressions

Other symbols (~`!@# ...) MAY be escaped without consequence, but are not required to be.

Test Case: A typical url

escapeRegExp("/path/to/resource.html?search=query");

>>> "\/path\/to\/resource\.html\?search=query"

The Long Answer

If you're going to use the function above at least link to this stack overflow post in your code's documentation so that it doesn't look like crazy hard-to-test voodoo.

var escapeRegExp;

(function () {
  // Referring to the table here:
  // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/regexp
  // these characters should be escaped
  // \ ^ $ * + ? . ( ) | { } [ ]
  // These characters only have special meaning inside of brackets
  // they do not need to be escaped, but they MAY be escaped
  // without any adverse effects (to the best of my knowledge and casual testing)
  // : ! , = 
  // my test "~!@#$%^&*(){}[]`/=?+\|-_;:'\",<.>".match(/[\#]/g)

  var specials = [
        // order matters for these
          "-"
        , "["
        , "]"
        // order doesn't matter for any of these
        , "/"
        , "{"
        , "}"
        , "("
        , ")"
        , "*"
        , "+"
        , "?"
        , "."
        , "\\"
        , "^"
        , "$"
        , "|"
      ]

      // I choose to escape every character with '\'
      // even though only some strictly require it when inside of []
    , regex = RegExp('[' + specials.join('\\') + ']', 'g')
    ;

  escapeRegExp = function (str) {
    return str.replace(regex, "\\$&");
  };

  // test escapeRegExp("/path/to/res?search=this.that")
}());

Request Monitoring in Chrome

Thanks all person who try to help in this post

I have ubuntu 13.10 and my chrome version is 34.0

For my situation this works

1.open developer tools in chrome(or use right click on your page and then select inspect element)
2.go to "Network" tab
3.find your ajax request in "Name Path" column 
4.click on the specific ajax link

now you should see a new Panel in front of you request

in this panel select "Response" tab

How do I set up HttpContent for my HttpClient PostAsync second parameter?

This is answered in some of the answers to Can't find how to use HttpContent as well as in this blog post.

In summary, you can't directly set up an instance of HttpContent because it is an abstract class. You need to use one the classes derived from it depending on your need. Most likely StringContent, which lets you set the string value of the response, the encoding, and the media type in the constructor. See: http://msdn.microsoft.com/en-us/library/system.net.http.stringcontent.aspx

How can I serve static html from spring boot?

Static files should be served from resources, not from controller.

Spring Boot will automatically add static web resources located within any of the following directories:
/META-INF/resources/  
/resources/  
/static/  
/public/

refs:
https://spring.io/blog/2013/12/19/serving-static-web-content-with-spring-boot
https://spring.io/guides/gs/serving-web-content/

"The breakpoint will not currently be hit. The source code is different from the original version." What does this mean?

I had the same issue in several projects in a layered architecture project and the problem was in configurations the build check box for the selected project hasn't been checked. so the issue was fixed for one project.

For one other layer it was giving this same trouble even the build is enable in the configurations. I did all the other options like restarting cleaning the project but non of them helped. Finally I unchecked the build checkbox for that particular project and cleaned and rebuild. the again marked the checkbox and did the same. then the issue was fixed.

Hope this helps..

Java getting the Enum name given the Enum Value

Try, the following code..

    @Override
    public String toString() {
    return this.name();
    }

How to implement debounce in Vue2?

I had the same problem and here is a solution that works without plugins.

Since <input v-model="xxxx"> is exactly the same as

<input
   v-bind:value="xxxx"
   v-on:input="xxxx = $event.target.value"
>

(source)

I figured I could set a debounce function on the assigning of xxxx in xxxx = $event.target.value

like this

<input
   v-bind:value="xxxx"
   v-on:input="debounceSearch($event.target.value)"
>

methods:

debounceSearch(val){
  if(search_timeout) clearTimeout(search_timeout);
  var that=this;
  search_timeout = setTimeout(function() {
    that.xxxx = val; 
  }, 400);
},

Iterate over object attributes in python

For python 3.6

class SomeClass:

    def attr_list(self, should_print=False):

        items = self.__dict__.items()
        if should_print:
            [print(f"attribute: {k}    value: {v}") for k, v in items]

        return items

How do I delete an exported environment variable?

unset is the command you're looking for.

unset GNUPLOT_DRIVER_DIR

tooltips for Button

The title attribute is meant to give more information. It's not useful for SEO so it's never a good idea to have the same text in the title and alt which is meant to describe the image or input is vs. what it does. for instance:

<button title="prints out hello world">Sample Buttons</button>

<img title="Hms beagle in the straits of magellan" alt="HMS Beagle painting" src="hms-beagle.jpg" />

The title attribute will make a tool tip, but it will be controlled by the browser as far as where it shows up and what it looks like. If you want more control there are third party jQuery options, many css templates such as Bootstrap have built in solutions, and you can also write a simple css solution if you want. check out this w3schools solution.

Proxy with urllib2

In addition set the proxy for the command line session Open a command line where you might want to run your script

netsh winhttp set proxy YourProxySERVER:yourProxyPORT

run your script in that terminal.

How can I generate a unique ID in Python?

This will work very quickly but will not generate random values but monotonously increasing ones (for a given thread).

import threading

_uid = threading.local()
def genuid():
    if getattr(_uid, "uid", None) is None:
        _uid.tid = threading.current_thread().ident
        _uid.uid = 0
    _uid.uid += 1
    return (_uid.tid, _uid.uid)

It is thread safe and working with tuples may have benefit as opposed to strings (shorter if anything). If you do not need thread safety feel free remove the threading bits (in stead of threading.local, use object() and remove tid altogether).

Hope that helps.

Selenium IDE - Command to wait for 5 seconds

In Chrome, For "Selenium IDE", I was also struggling that it doesn't pause. It will pause, if you give as below:

Command: pause
Target: blank
Value: 10000

This will pause for 10 seconds.

Run / Open VSCode from Mac Terminal

If you are on Mac OSX Maverick, it's ~/.bash_profile not ~/.bashrc

Try putting the code in there, close the terminal and then try again. Should be working

FB OpenGraph og:image not pulling images (possibly https?)

In addition, this problem also occurs when you add a user generated story (where you do not use og:image). For example:

POST /me/cookbook:eat?
  recipe=http://www.example.com/recipes/pizza/&
  image[0][url]=http://www.example.com/recipes/pizza/pizza.jpg&
  image[0][user_generated]=true&
  access_token=VALID_ACCESS_TOKEN

The above will only work with http and not with https. If you use https, you will get an error that says: Attached image () failed to upload

Where are static methods and static variables stored in Java?

Prior to Java 8:

The static variables were stored in the permgen space(also called the method area).

PermGen Space is also known as Method Area

PermGen Space used to store 3 things

Class level data (meta-data)
interned strings
static variables

From Java 8 onwards

The static variables are stored in the Heap itself.From Java 8 onwards the PermGen Space have been removed and new space named as MetaSpace is introduced which is not the part of Heap any more unlike the previous Permgen Space. Meta-Space is present on the native memory (memory provided by the OS to a particular Application for its own usage) and it now only stores the class meta-data.

The interned strings and static variables are moved into the heap itself.

For official information refer : JEP 122:Remove the Permanent Gen Space

How to send password securely over HTTP?

you can use ssl for your host there is free project for ssl like letsencrypt https://letsencrypt.org/

How do I find out my root MySQL password?

Hmm Mysql 5.7.13 to reset all I did was:

$ sudo service mysql stop To stop mysql

$ mysqld_safe --skip-grant-tables & Start mysql

$ mysql -u root

Just like the correct answer. Then all I did was do what @eebbesen did.

mysql> SET PASSWORD FOR root@'localhost' = PASSWORD('NEW-password-HERE');

Hope it helps anyone out there :)

Tab key == 4 spaces and auto-indent after curly braces in Vim

The auto-indent is based on the current syntax mode. I know that if you are editing Foo.java, then entering a { and hitting Enter indents the following line.

As for tabs, there are two settings. Within Vim, type a colon and then "set tabstop=4" which will set the tabs to display as four spaces. Hit colon again and type "set expandtab" which will insert spaces for tabs.

You can put these settings in a .vimrc (or _vimrc on Windows) in your home directory, so you only have to type them once.

Javascript/DOM: How to remove all events of a DOM object?

One method is to add a new event listener that calls e.stopImmediatePropagation().

Converting array to list in Java

Even shorter:

List<Integer> list = Arrays.asList(1, 2, 3, 4);

reading text file with utf-8 encoding using java

You need to specify the encoding of the InputStreamReader using the Charset parameter.

Charset inputCharset = Charset.forName("ISO-8859-1");
InputStreamReader isr = new InputStreamReader(fis, inputCharset));

This is work for me. i hope to help you.

How to recursively delete an entire directory with PowerShell 2.0?

$users = get-childitem \\ServerName\c$\users\ | select -ExpandProperty name

foreach ($user in $users)

{
remove-item -path "\\Servername\c$\Users\$user\AppData\Local\Microsoft\Office365\PowerShell\*" -Force -Recurse
Write-Warning "$user Cleaned"
}

Wrote the above to clean some logfiles without deleting the parent directory and this works perfectly!

Convert output of MySQL query to utf8

You can use CAST and CONVERT to switch between different types of encodings. See: http://dev.mysql.com/doc/refman/5.0/en/charset-convert.html

SELECT column1, CONVERT(column2 USING utf8)
FROM my_table 
WHERE my_condition;

Formatting a Date String in React Native

The beauty of the React Native is that it supports lots of JS libraries like Moment.js. Using moment.js would be a better/easier way to handle date/time instead coding from scratch

just run this in the terminal (yarn add moment also works if using React's built-in package manager):

npm install moment --save

And in your React Native js page:

import Moment from 'moment';

render(){
    Moment.locale('en');
    var dt = '2016-05-02T00:00:00';
    return(<View> {Moment(dt).format('d MMM')} </View>) //basically you can do all sorts of the formatting and others
}

You may check the moment.js official docs here https://momentjs.com/docs/

Set the maximum character length of a UITextField

You can also do this using NotificationCenter in Swift 4

NotificationCenter.default.addObserver(self, selector: #selector(self.handleTextChange(recognizer:)), name: NSNotification.Name.UITextFieldTextDidChange, object: yourTextField)

    @objc func handleTextChange(recognizer: NSNotification) {
            //max length is 50 charater max
            let textField = recognizer.object as! UITextField

            if((textField.text?.count)! > 50) {
                let newString: String? = (textField.text as NSString?)?.substring(to: 50)
                textField.text = newString

            }         
        }

WHERE vs HAVING

These 2 will be feel same as first as both are used to say about a condition to filter data. Though we can use ‘having’ in place of ‘where’ in any case, there are instances when we can’t use ‘where’ instead of ‘having’. This is because in a select query, ‘where’ filters data before ‘select’ while ‘having’ filter data after ‘select’. So, when we use alias names that are not actually in the database, ‘where’ can’t identify them but ‘having’ can.

Ex: let the table Student contain student_id,name, birthday,address.Assume birthday is of type date.

SELECT * FROM Student WHERE YEAR(birthday)>1993; /*this will work as birthday is in database.if we use having in place of where too this will work*/

SELECT student_id,(YEAR(CurDate())-YEAR(birthday)) AS Age FROM Student HAVING Age>20; 
/*this will not work if we use ‘where’ here, ‘where’ don’t know about age as age is defined in select part.*/

How to log in to phpMyAdmin with WAMP, what is the username and password?

In my case it was

username : root
password : mysql

Using : Wamp server 3.1.0

Jackson enum Serializing and DeSerializer

Actual Answer:

The default deserializer for enums uses .name() to deserialize, so it's not using the @JsonValue. So as @OldCurmudgeon pointed out, you'd need to pass in {"event": "FORGOT_PASSWORD"} to match the .name() value.

An other option (assuming you want the write and read json values to be the same)...

More Info:

There is (yet) another way to manage the serialization and deserialization process with Jackson. You can specify these annotations to use your own custom serializer and deserializer:

@JsonSerialize(using = MySerializer.class)
@JsonDeserialize(using = MyDeserializer.class)
public final class MyClass {
    ...
}

Then you have to write MySerializer and MyDeserializer which look like this:

MySerializer

public final class MySerializer extends JsonSerializer<MyClass>
{
    @Override
    public void serialize(final MyClass yourClassHere, final JsonGenerator gen, final SerializerProvider serializer) throws IOException, JsonProcessingException
    {
        // here you'd write data to the stream with gen.write...() methods
    }

}

MyDeserializer

public final class MyDeserializer extends org.codehaus.jackson.map.JsonDeserializer<MyClass>
{
    @Override
    public MyClass deserialize(final JsonParser parser, final DeserializationContext context) throws IOException, JsonProcessingException
    {
        // then you'd do something like parser.getInt() or whatever to pull data off the parser
        return null;
    }

}

Last little bit, particularly for doing this to an enum JsonEnum that serializes with the method getYourValue(), your serializer and deserializer might look like this:

public void serialize(final JsonEnum enumValue, final JsonGenerator gen, final SerializerProvider serializer) throws IOException, JsonProcessingException
{
    gen.writeString(enumValue.getYourValue());
}

public JsonEnum deserialize(final JsonParser parser, final DeserializationContext context) throws IOException, JsonProcessingException
{
    final String jsonValue = parser.getText();
    for (final JsonEnum enumValue : JsonEnum.values())
    {
        if (enumValue.getYourValue().equals(jsonValue))
        {
            return enumValue;
        }
    }
    return null;
}

long long int vs. long int vs. int64_t in C++

You don't need to go to 64-bit to see something like this. Consider int32_t on common 32-bit platforms. It might be typedef'ed as int or as a long, but obviously only one of the two at a time. int and long are of course distinct types.

It's not hard to see that there is no workaround which makes int == int32_t == long on 32-bit systems. For the same reason, there's no way to make long == int64_t == long long on 64-bit systems.

If you could, the possible consequences would be rather painful for code that overloaded foo(int), foo(long) and foo(long long) - suddenly they'd have two definitions for the same overload?!

The correct solution is that your template code usually should not be relying on a precise type, but on the properties of that type. The whole same_type logic could still be OK for specific cases:

long foo(long x);
std::tr1::disable_if(same_type(int64_t, long), int64_t)::type foo(int64_t);

I.e., the overload foo(int64_t) is not defined when it's exactly the same as foo(long).

[edit] With C++11, we now have a standard way to write this:

long foo(long x);
std::enable_if<!std::is_same<int64_t, long>::value, int64_t>::type foo(int64_t);

[edit] Or C++20

long foo(long x);
int64_t foo(int64_t) requires (!std::is_same_v<int64_t, long>);

Insert PHP code In WordPress Page and Post

WordPress does not execute PHP in post/page content by default unless it has a shortcode.

The quickest and easiest way to do this is to use a plugin that allows you to run PHP embedded in post content.

There are two other "quick and easy" ways to accomplish it without a plugin:

Make it a shortcode (put it in functions.php and have it echo the country name) which is very easy - see here: Shortcode API at WP Codex
Put it in a template file - make a custom template for that page based on your default page template and add the PHP into the template file rather than the post content: Custom Page Templates

Checkbox angular material checked by default

The chosen answer does work however I wanted to make a comment that having 'ngModel' on the html tag causes the checkbox checked to not be set to true.

This occurs when you are trying to do bind using the checked property. i.e.

<mat-checkbox [checked]='var' ngModel name='some_name'></mat-checkbox>

And then inside your app.component.ts file

var = true;

will not work.

TLDR: Remove ngModel if you are setting the checked through the [checked] property

    <mat-checkbox [checked]='var' name='some_name'></mat-checkbox>

How to create a zip file in Java

This is how you create a zip file from a source file:

String srcFilename = "C:/myfile.txt";
String zipFile = "C:/myfile.zip";

try {
    byte[] buffer = new byte[1024];
    FileOutputStream fos = new FileOutputStream(zipFile);
    ZipOutputStream zos = new ZipOutputStream(fos);         
    File srcFile = new File(srcFilename);
    FileInputStream fis = new FileInputStream(srcFile);
    zos.putNextEntry(new ZipEntry(srcFile.getName()));          
    int length;
    while ((length = fis.read(buffer)) > 0) {
        zos.write(buffer, 0, length);
    }
    zos.closeEntry();
    fis.close();
    zos.close();            
}
catch (IOException ioe) {
    System.out.println("Error creating zip file" + ioe);
}

What is a clean, Pythonic way to have multiple constructors in Python?

All of these answers are excellent if you want to use optional parameters, but another Pythonic possibility is to use a classmethod to generate a factory-style pseudo-constructor:

def __init__(self, num_holes):

  # do stuff with the number

@classmethod
def fromRandom(cls):

  return cls( # some-random-number )

Windows batch script to unhide files hidden by virus

Try this one. Hope this is working fine.. :)

@ECHO off

cls

ECHO.

set drvltr=

set /p drvltr=Enter Drive letter: 

attrib -s -h -a /s /d  %drvltr%:\*.*

ECHO Unhide Completed

pause

HTTP Status 405 - HTTP method POST is not supported by this URL java servlet

It's because you're calling doGet() without actually implementing doGet(). It's the default implementation of doGet() that throws the error saying the method is not supported.

ADB not responding. You can wait more,or kill "adb.exe" process manually and click 'Restart'

If you are suffering from "ADB not responding. If you’d like to retry, then please manually kill ‘adb’ and click ‘Restart’ or terminal appear Syntax error: “)” unexpected" then perhaps you are using 32bit OS and platform-tools has updated up 23.1. The solution is to go back to the platform-tools 23.0.1.

You can download the platform-tools 23.0.1 for Linux here , for windowns here and Mac here

After the download, go to your sdk location > platform-tools folder to delete old platform-tools in sdk and paste down into the downloaded one.

Woohooo ... it should work.

This is a bug with latest ADT.

how to read xml file from url using php

$url = 'http://www.example.com'; $xml = simpleXML_load_file($url,"SimpleXMLElement",LIBXML_NOCDATA);

$url can be php file, as long as the file generate xml format data as output.

Not connecting to SQL Server over VPN

if you're using sql server 2005, start sql server browser service first

How to save a base64 image to user's disk using JavaScript?

HTML5 `download` attribute

Just to allow user to download the image or other file you may use the HTML5 download attribute.

Static file download

<a href="/images/image-name.jpg" download>
<!-- OR -->
<a href="/images/image-name.jpg" download="new-image-name.jpg">

Dynamic file download

In cases requesting image dynamically it is possible to emulate such download.

If your image is already loaded and you have the base64 source then:

function saveBase64AsFile(base64, fileName) {
    var link = document.createElement("a");

    document.body.appendChild(link); // for Firefox

    link.setAttribute("href", base64);
    link.setAttribute("download", fileName);
    link.click();
}

Otherwise if image file is downloaded as Blob you can use FileReader to convert it to Base64:

function saveBlobAsFile(blob, fileName) {
    var reader = new FileReader();

    reader.onloadend = function () {    
        var base64 = reader.result ;
        var link = document.createElement("a");

        document.body.appendChild(link); // for Firefox

        link.setAttribute("href", base64);
        link.setAttribute("download", fileName);
        link.click();
    };

    reader.readAsDataURL(blob);
}

Firefox

The anchor tag you are creating also needs to be added to the DOM in Firefox, in order to be recognized for click events (Link).

IE is not supported: Caniuse link

Android Spinner: Get the selected item change event

The docs for the spinner-widget says

A spinner does not support item click events.

You should use setOnItemSelectedListener to handle your problem.

Bootstrap throws Uncaught Error: Bootstrap's JavaScript requires jQuery

Try this

Change the order of files it should be like below..

<script src="js/jquery-1.11.0.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/wow.min.js"></script>

Using DISTINCT along with GROUP BY in SQL Server

Perhaps not in the context that you have it, but you could use

SELECT DISTINCT col1,
PERCENTILE_CONT(col2) WITHIN GROUP (ORDER BY col2) OVER (PARTITION BY col1),
PERCENTILE_CONT(col2) WITHIN GROUP (ORDER BY col2) OVER (PARTITION BY col1, col3),
FROM TableA

You would use this to return different levels of aggregation returned in a single row. The use case would be for when a single grouping would not suffice all of the aggregates needed.

Ansible: copy a directory content to another directory

Resolved answer: To copy a directory's content to another directory I use the next:

- name: copy consul_ui files
  command: cp -r /home/{{ user }}/dist/{{ item }} /usr/share/nginx/html
  with_items:
   - "index.html"
   - "static/"

It copies both items to the other directory. In the example, one of the items is a directory and the other is not. It works perfectly.

What exactly is the function of Application.CutCopyMode property in Excel

Normally, When you copy a cell you will find the below statement written down in the status bar (in the bottom of your sheet)

"Select destination and Press Enter or Choose Paste"

Then you press whether Enter or choose paste to paste the value of the cell.

If you didn't press Esc afterwards you will be able to paste the value of the cell several times

Application.CutCopyMode = False does the same like the Esc button, if you removed it from your code you will find that you are able to paste the cell value several times again.

And if you closed the Excel without pressing Esc you will get the warning 'There is a large amount of information on the Clipboard....'

How to send and retrieve parameters using $state.go toParams and $stateParams?

The solution we came to having a state that took 2 parameters was changing:

.state('somestate', {
  url: '/somestate',
  views: {...}
}

.state('somestate', {
  url: '/somestate?id=:&sub=:',
  views: {...}
}

How can I format a decimal to always show 2 decimal places?

If you're using this for currency, and also want the value to be seperated by ,'s you can use

$ {:,.f2}.format(currency_value).

e.g.:

currency_value = 1234.50

$ {:,.f2}.format(currency_value) --> $ 1,234.50

Here is a bit of code I wrote some time ago:

print("> At the end of year " + year_string + " total paid is \t$ {:,.2f}".format(total_paid))

> At the end of year   1  total paid is         $ 43,806.36
> At the end of year   2  total paid is         $ 87,612.72
> At the end of year   3  total paid is         $ 131,419.08
> At the end of year   4  total paid is         $ 175,225.44
> At the end of year   5  total paid is         $ 219,031.80   <-- Note .80 and not .8
> At the end of year   6  total paid is         $ 262,838.16
> At the end of year   7  total paid is         $ 306,644.52
> At the end of year   8  total paid is         $ 350,450.88
> At the end of year   9  total paid is         $ 394,257.24
> At the end of year  10  total paid is         $ 438,063.60   <-- Note .60 and not .6
> At the end of year  11  total paid is         $ 481,869.96
> At the end of year  12  total paid is         $ 525,676.32
> At the end of year  13  total paid is         $ 569,482.68
> At the end of year  14  total paid is         $ 613,289.04
> At the end of year  15  total paid is         $ 657,095.40   <-- Note .40 and not .4  
> At the end of year  16  total paid is         $ 700,901.76
> At the end of year  17  total paid is         $ 744,708.12
> At the end of year  18  total paid is         $ 788,514.48
> At the end of year  19  total paid is         $ 832,320.84
> At the end of year  20  total paid is         $ 876,127.20   <-- Note .20 and not .2

What is the recommended project structure for spring boot rest projects?

config - class which will read from property files

cache - caching mechanism class files

constants - constant defined class

controller - controller class

exception - exception class

model - pojos classes will be present

security - security classes

service - Impl classes

util - utility classes

validation - validators classes

bootloader - main class

How to remove old Docker containers

UPDATED 2021 (NEWEST)

docker container prune

This - 2017 (OLD) way

To remove ALL STOPPED CONTAINERS

docker rm $(docker ps -a -q)

To remove ALL CONTAINERS (STOPPED AND NON STOPPED)

docker rm  -f $(docker ps -a -q)

How to close existing connections to a DB

This should disconnect everyone else, and leave you as the only user:

alter database YourDb set single_user with rollback immediate

Note: Don't forget

alter database YourDb set MULTI_USER

after you're done!

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

npm install -g increase-memory-limit

increase-memory-limit

Navigate to %appdata% -> npm folder or C:\Users\{user_name}\AppData\Roaming\npm
Open ng.cmd in your favorite editor
Add --max_old_space_size=8192 to the IF and ELSE block

now ng.cmd file looks like this after the change:

@IF EXIST "%~dp0\node.exe" (
  "%~dp0\node.exe" "--max_old_space_size=8192" "%~dp0\node_modules\@angular\cli\bin\ng" %*
) ELSE (
  @SETLOCAL
  @SET PATHEXT=%PATHEXT:;.JS;=;%
  node "--max_old_space_size=8192" "%~dp0\node_modules\@angular\cli\bin\ng" %*
)

Get Wordpress Category from Single Post

How about get_the_category?

You can then do

$category = get_the_category();
$firstCategory = $category[0]->cat_name;

Escape double quotes in parameter

As none of the answers above are straight forward:

Backslash escape \ is what you need:

myscript \"test\"

Multiline text in JLabel

Type the content (i.e., the "text" property field) inside a <html></html> tag. So you can use <br> or<P> to insert a newline.

For example:

String labelContent = "<html>Twinkle, twinkle, little star,<BR>How I wonder what you are.<BR>Up above the world so high,<BR>Like a diamond in the sky.</html>";

It will display as follows:

Twinkle, twinkle, little star,
How I wonder what you are.
Up above the world so high,
Like a diamond in the sky.

Java - How to create a custom dialog box?

Well, you essentially create a JDialog, add your text components and make it visible. It might help if you narrow down which specific bit you're having trouble with.

How to have image and text side by side

HTML

<div class='containerBox'>
    <div>
       <img src='http://ecx.images-amazon.com/images/I/21-leKb-zsL._SL500_AA300_.png' class='iconDetails'>
       <div>
       <h4>Facebook</h4>  
       <div style="font-size:.6em;float:left; margin-left:5px;color:white;">fine location, GPS, coarse location</div>
       <div style="float:right;font-size:.6em; margin-right:5px; color:white;">0 mins ago</div>
       </div>
   </div> 
</div>

CSS

 .iconDetails {
 margin-left:2%;
 float:left; 
 height:40px;
 width:40px;
 } 

.containerBox {
width:300px;
height:60px;
padding:1px;
background-color:#303030;
}
h4{
margin:0px;
margin-top:3%;
margin-left:50px;
color:white;
}

HttpServlet cannot be resolved to a type .... is this a bug in eclipse?

A simple solution for me was to go to Properties -> Java Build Path -> Order and Export, then check the Apache Tomcat library. This is assumes you've already set Tomcat as your deployment target and are still getting the error.

What is the best way to get the minimum or maximum value from an Array of numbers?

Please take into account that sorting the array will only be faster that looping up to certain size of the array. If your array is small (and it will be like that any time) then your solution is perfectly fine. But if it might get too large you should use a conditional to use the sort approach when the array is small, and the normal iteration when it is too large

Copy Image from Remote Server Over HTTP

Use a GET request to download the image and save it to a web accessible directory on your server.

As you are using PHP, you can use curl to download files from the other server.

psql: FATAL: role "postgres" does not exist

NOTE: If you installed postgres using homebrew, see the comment from @user3402754 below.

Note that the error message does NOT talk about a missing database, it talks about a missing role. Later in the login process it might also stumble over the missing database.

But the first step is to check the missing role: What is the output within psql of the command \du ? On my Ubuntu system the relevant line looks like this:

                              List of roles
 Role name |            Attributes             | Member of 
-----------+-----------------------------------+-----------
 postgres  | Superuser, Create role, Create DB | {}

If there is not at least one role with superuser, then you have a problem :-)

If there is one, you can use that to login. And looking at the output of your \l command: The permissions for user on the template0 and template1 databases are the same as on my Ubuntu system for the superuser postgres. So I think your setup simple uses user as the superuser. So you could try this command to login:

sudo -u user psql user

If user is really the DB superuser you can create another DB superuser and a private, empty database for him:

CREATE USER postgres SUPERUSER;
CREATE DATABASE postgres WITH OWNER postgres;

But since your postgres.app setup does not seem to do this, you also should not. Simple adapt the tutorial.

C++ callback using class member

A complete working example from the code above.... for C++11:

#include <stdlib.h>
#include <stdio.h>
#include <functional>

#if __cplusplus <= 199711L
  #error This file needs at least a C++11 compliant compiler, try using:
  #error    $ g++ -std=c++11 ..
#endif

using namespace std;

class EventHandler {
    public:
        void addHandler(std::function<void(int)> callback) {
            printf("\nHandler added...");
            // Let's pretend an event just occured
            callback(1);
        }
};


class MyClass
{
    public:
        MyClass(int);
        // Note: No longer marked `static`, and only takes the actual argument
        void Callback(int x);

    private:
        EventHandler *pHandler;
        int private_x;
};

MyClass::MyClass(int value) {
    using namespace std::placeholders; // for `_1`

    pHandler = new EventHandler();
    private_x = value;
    pHandler->addHandler(std::bind(&MyClass::Callback, this, _1));
}

void MyClass::Callback(int x) {
    // No longer needs an explicit `instance` argument,
    // as `this` is set up properly
    printf("\nResult:%d\n\n", (x+private_x));
}

// Main method
int main(int argc, char const *argv[]) {

    printf("\nCompiler:%ld\n", __cplusplus);
    new MyClass(5);
    return 0;
}


// where $1 is your .cpp file name... this is the command used:
// g++ -std=c++11 -Wall -o $1 $1.cpp
// chmod 700 $1
// ./$1

Output should be:

Compiler:201103

Handler added...
Result:6

How can I copy the content of a branch to a new local branch?

With Git 2.15 (Q4 2017), "git branch" learned "-c/-C" to create a new branch by copying an existing one.

See commit c8b2cec (18 Jun 2017) by Ævar Arnfjörð Bjarmason (avar).
See commit 52d59cc, commit 5463caa (18 Jun 2017) by Sahil Dua (sahildua2305).
^{(Merged by Junio C Hamano -- gitster -- in commit 3b48045, 03 Oct 2017)}

branch: add a --copy (-c) option to go with --move (-m)

Add the ability to --copy a branch and its reflog and configuration, this uses the same underlying machinery as the --move (-m) option except the reflog and configuration is copied instead of being moved.

This is useful for e.g. copying a topic branch to a new version, e.g. work to work-2 after submitting the work topic to the list, while preserving all the tracking info and other configuration that goes with the branch, and unlike --move keeping the other already-submitted branch around for reference.

Note: when copying a branch, you remain on your current branch.
As Junio C Hamano explains, the initial implementation of this new feature was modifying HEAD, which was not good:

When creating a new branch B by copying the branch A that happens to be the current branch, it also updates HEAD to point at the new branch.
It probably was made this way because "git branch -c A B" piggybacked its implementation on "git branch -m A B",

This does not match the usual expectation.
If I were sitting on a blue chair, and somebody comes and repaints it to red, I would accept ending up sitting on a chair that is now red (I am also OK to stand, instead, as there no longer is my favourite blue chair).

But if somebody creates a new red chair, modelling it after the blue chair I am sitting on, I do not expect to be booted off of the blue chair and ending up on sitting on the new red one.

How to instantiate a javascript class in another js file?

Possible Suggestions to make it work:

Some modifications (U forgot to include a semicolon in the statement this.getName=function(){...} it should be this.getName=function(){...};)

function Customer(){
this.name="Jhon";
this.getName=function(){
return this.name;
};
}

(This might be one of the problem.)

and

Make sure U Link the JS files in the correct order

<script src="file1.js" type="text/javascript"></script>
<script src="file2.js" type="text/javascript"></script>

Is there a way to use PhantomJS in Python?

Now since the GhostDriver comes bundled with the PhantomJS, it has become even more convenient to use it through Selenium.

I tried the Node installation of PhantomJS, as suggested by Pykler, but in practice I found it to be slower than the standalone installation of PhantomJS. I guess standalone installation didn't provided these features earlier, but as of v1.9, it very much does so.

Install PhantomJS (http://phantomjs.org/download.html) (If you are on Linux, following instructions will help https://stackoverflow.com/a/14267295/382630)
Install Selenium using pip.

Now you can use like this

import selenium.webdriver
driver = selenium.webdriver.PhantomJS()
driver.get('http://google.com')
# do some processing

driver.quit()

How to check Django version

You can do it without Python too. Just type this in your Django directory:

cat __init__.py | grep VERSION

And you will get something like:

VERSION = (1, 5, 5, 'final', 0)

cleanup php session files

cd to sessions directory and then:

1) View sessions older than 40 min: find . -amin +40 -exec stat -c "%n %y" {} \;

2) Remove sessions older than 40 min: find . -amin +40 -exec rm {} \;

Print very long string completely in pandas dataframe

Another easier way to print the whole string is to call values on the dataframe.

df = pd.DataFrame({'one' : ['one', 'two', 
      'This is very long string very long string very long string veryvery long string']})

print(df.values)

The Output will be

[['one']
 ['two']
 ['This is very long string very long string very long string veryvery long string']]

Python print statement “Syntax Error: invalid syntax”

Use print("use this bracket -sample text")

In Python 3 print "Hello world" gives invalid syntax error.

To display string content in Python3 have to use this ("Hello world") brackets.

jQuery get the rendered height of an element?

style = window.getComputedStyle(your_element);

then simply: style.height

unbound method f() must be called with fibo_ instance as first argument (got classobj instance instead)

Try this. For python 2.7.12 we need to define constructor or need to add self to each methods followed by defining an instance of an class called object.

import cv2

class calculator:

#   def __init__(self):

def multiply(self, a, b):
    x= a*b
    print(x)

def subtract(self, a,b):
    x = a-b
    print(x)

def add(self, a,b):
    x = a+b
    print(x)

def div(self, a,b):
    x = a/b
    print(x)

 calc = calculator()
 calc.multiply(2,3)
 calc.add(2,3)
 calc.div(10,5)
 calc.subtract(2,3)

jQuery UI Datepicker - Multiple Date Selections

I have now spent quite some time trying to find a good date picker that support interval ranges, and eventually found this one:

http://keith-wood.name/datepick.html

I believe this may be the best jquery date picker for selecting a range or multiple dates, and it is claimed to have been the base for the jQuery UI datepicker, and I see no reason to doubt that since it seems to be really powerful, and also good documented !

What is the actual use of Class.forName("oracle.jdbc.driver.OracleDriver") while connecting to a database?

Pre Java 6 the DriverManager class wouldn't have known which JDBC driver you wanted to use. Class.forName("...") was a way on pre-loading the driver classes.

If you are using Java 6 you no longer need to do this.

How to extend an existing JavaScript array with another array, without creating a new array

I like the a.push.apply(a, b) method described above, and if you want you can always create a library function like this:

Array.prototype.append = function(array)
{
    this.push.apply(this, array)
}

and use it like this

a = [1,2]
b = [3,4]

a.append(b)

How can I trigger another job from a jenkins pipeline (jenkinsfile) with GitHub Org Plugin?

In addition to the above mentioned answers: I wanted to start a job with a simple parameter passed to a second pipeline and found the answer on http://web.archive.org/web/20160209062101/https://dzone.com/refcardz/continuous-delivery-with-jenkins-workflow

So i used:

stage ('Starting ART job') {
    build job: 'RunArtInTest', parameters: [[$class: 'StringParameterValue', name: 'systemname', value: systemname]]
}

Error:Execution failed for task ':app:compileDebugKotlin'. > Compilation error. See log for more details

I want to add my solution to above, maybe it helps someone. When i create a field on a model via Room and do not generate getter/setter for the field. As a result project is not compiling and no clear errors.

How do I show the number keyboard on an EditText in android?

EditText number1 = (EditText) layout.findViewById(R.id.edittext); 
number1.setInputType(InputType.TYPE_CLASS_NUMBER);

How to create a self-signed certificate for a domain name for development?

Another option is to create a self-signed certificate that allows you to specify the domain name per website. This means you can use it across many domain names.

In IIS Manager

Click machine name node
Open Server Certificates
In Actions panel, choose 'Create Self-Signed Certificate'
In 'Specify a friendly name...' name it *Dev (select 'Personal' from type list)
Save

Now, on your website in IIS...

Manage the bindings
Create a new binding for Https
Choose your self-signed certificate from the list
Once selected, the domain name box will become enabled and you'll be able to input your domain name.

invalid byte sequence for encoding "UTF8"

I had the same problem, and found a nice solution here: http://blog.e-shell.org/134

This is caused by a mismatch in your database encodings, surely because the database from where you got the SQL dump was encoded as SQL_ASCII while the new one is encoded as UTF8. .. Recode is a small tool from the GNU project that let you change on-the-fly the encoding of a given file.

So I just recoded the dumpfile before playing it back:

postgres> gunzip -c /var/backups/pgall_b1.zip | recode iso-8859-1..u8 | psql test

In Debian or Ubuntu systems, recode can be installed via package.

Is there a way to check if a file is in use?

Aside from working 3-liners and just for reference: If you want the full blown information - there is a little project on Microsoft Dev Center:

https://code.msdn.microsoft.com/windowsapps/How-to-know-the-process-704839f4

From the Introduction:

The C# sample code developed in .NET Framework 4.0 would help in finding out which is the process that is having a lock on a file. RmStartSession function which is included in rstrtmgr.dll has been used to create a restart manager session and according to the return result a new instance of Win32Exception object is created. After registering the resources to a Restart Manager session via RmRegisterRescources function, RmGetList function is invoked to check what are the applications are using a particular file by enumerating the RM_PROCESS_INFO array.

It works by connecting to the "Restart Manager Session".

The Restart Manager uses the list of resources registered with the session to determine which applications and services must be shut down and restarted. Resources can be identified by filenames, service short names, or RM_UNIQUE_PROCESS structures that describe running applications.

It might be a little overengineered for your particular needs... But if that is what you want, go ahead and grab the vs-project.

Is there such a thing as min-font-size and max-font-size?

This is actually being proposed in CSS4

Working draft at the W3C

Quote:

These two properties allow a website or user to require an element’s font size to be clamped within the range supplied with these two properties. If the computed value font-size is outside the bounds created by font-min-size and font-max-size, the use value of font-size is clamped to the values specified in these two properties.

This would actually work as following:

.element {
    font-min-size: 10px;
    font-max-size: 18px;
    font-size: 5vw; // viewport-relative units are responsive.
}

This would literally mean, the font size will be 5% of the viewport's width, but never smaller than 10 pixels, and never larger than 18 pixels.

Unfortunately, this feature isn't implemented anywhere yet, (not even on caniuse.com).

Debugging "Element is not clickable at point" error

ruby/watir-webdriver/chrome

I use the following trick and seems like it works:

#scroll to myelement
@browser.execute_script "window.scrollTo(#{myelement.element.wd.location[0]},#{myelement.element.wd.location[1]})"

# click myelement
myelement.when_present.fire_event("click")

How to write to a file, using the logging Python module?

http://docs.python.org/library/logging.handlers.html#filehandler

The FileHandler class, located in the core logging package, sends logging output to a disk file.

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

There are several approaches:

You can normally see assembly code while debugging C++ in visual studio (and eclipse too). For this in Visual Studio put a breakpoint on code in question and when debugger hits it rigth click and find "Go To Assembly" ( or press CTRL+ALT+D )
Second approach is to generate assembly listings while compiling. For this go to project settings -> C/C++ -> Output Files -> ASM List Location and fill in file name. Also select "Assembly Output" to "Assembly With Source Code".
Compile the program and use any third-party debugger. You can use OllyDbg or WinDbg for this. Also you can use IDA (interactive disassembler). But this is hardcore way of doing it.

Value of type 'T' cannot be converted to

I know similar code that the OP posted in this question from generic parsers. From a performance perspective, you should use Unsafe.As<TFrom, TResult>(ref TFrom source), which can be found in the System.Runtime.CompilerServices.Unsafe NuGet package. It avoids boxing for value types in these scenarios. I also think that Unsafe.As results in less machine code produced by the JIT than casting twice (using (TResult) (object) actualString), but I haven't checked that out.

public TResult ParseSomething<TResult>(ParseContext context)
{
    if (typeof(TResult) == typeof(string))
    {
        var token = context.ParseNextToken();
        string parsedString = token.ParseToDotnetString();
        return Unsafe.As<string, TResult>(ref parsedString);
    }
    else if (typeof(TResult) == typeof(int))
    {
        var token = context.ParseNextToken();
        int parsedInt32 = token.ParseToDotnetInt32();
        // This will not box which might be critical to performance
        return Unsafe.As<int, TResult>(ref parsedInt32); 
    }
    // other cases omitted for brevity's sake
}

Unsafe.As will be replaced by the JIT with efficient machine code instructions, as you can see in the official CoreFX repo:

Composer: file_put_contents(./composer.json): failed to open stream: Permission denied

In my case, .composer was owned by root, so I did sudo rm -fr .composer and then my global require worked.

Be warned! You don't wanna use that command if you are not sure what you are doing.

How does the compilation/linking process work?

On the standard front:

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

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

How can I know which radio button is selected via jQuery?

You can call Function onChange()

  <input type="radio" name="radioName" value="1" onchange="radio_changed($(this).val())" /> 1 <br />
  <input type="radio" name="radioName" value="2" onchange="radio_changed($(this).val())"  /> 2 <br />
  <input type="radio" name="radioName" value="3"  onchange="radio_changed($(this).val())" /> 3 <br />

<script>
function radio_changed(val){
    alert(val);
}
</script>

Pretty git branch graphs

gitg: a gtk-based repository viewer, that's new but interesting and useful
http://git.gnome.org/browse/gitg
I use it currently

How to set cell spacing and UICollectionView - UICollectionViewFlowLayout size ratio?

Swift 5 : For evenly distributed spaces between cells with dynamic cell width to make the best of container space you may use the code snippet below by providing a minimumCellWidth value.

private func collectionViewLayout() -> UICollectionViewLayout {
    
    let layout = UICollectionViewFlowLayout()
    layout.sectionHeadersPinToVisibleBounds = true
    // Important: if direction is horizontal use minimumItemSpacing instead. 
    layout.scrollDirection = .vertical
    
    let itemHeight: CGFloat = 240
    let minCellWidth :CGFloat = 130.0
    let minItemSpacing: CGFloat = 10
    let containerWidth: CGFloat = self.view.bounds.width
    let maxCellCountPerRow: CGFloat =  floor((containerWidth - minItemSpacing) / (minCellWidth+minItemSpacing ))
    
    let itemWidth: CGFloat = floor( ((containerWidth - (2 * minItemSpacing) - (maxCellCountPerRow-1) * minItemSpacing) / maxCellCountPerRow  ) )
    // Calculate the remaining space after substracting calculating cellWidth (Divide by 2 because of left and right insets)
    let inset = max(minItemSpacing, floor( (containerWidth - (maxCellCountPerRow*itemWidth) - (maxCellCountPerRow-1)*minItemSpacing) / 2 ) )

    
    layout.itemSize = CGSize(width: itemWidth, height: itemHeight)
    layout.minimumInteritemSpacing = min(minItemSpacing,inset)
    layout.minimumLineSpacing = minItemSpacing
    layout.sectionInset = UIEdgeInsets(top: minItemSpacing, left: inset, bottom: minItemSpacing, right: inset)

    
    return layout
}

Node.js - get raw request body using Express

Edit 2: Release 1.15.2 of the body parser module introduces raw mode, which returns the body as a Buffer. By default, it also automatically handles deflate and gzip decompression. Example usage:

var bodyParser = require('body-parser');
app.use(bodyParser.raw(options));

app.get(path, function(req, res) {
  // req.body is a Buffer object
});

By default, the options object has the following default options:

var options = {
  inflate: true,
  limit: '100kb',
  type: 'application/octet-stream'
};

If you want your raw parser to parse other MIME types other than application/octet-stream, you will need to change it here. It will also support wildcard matching such as */* or */application.

Note: The following answer is for versions before Express 4, where middleware was still bundled with the framework. The modern equivalent is the body-parser module, which must be installed separately.

The rawBody property in Express was once available, but removed since version 1.5.1. To get the raw request body, you have to put in some middleware before using the bodyParser. You can also read a GitHub discussion about it here.

app.use(function(req, res, next) {
  req.rawBody = '';
  req.setEncoding('utf8');

  req.on('data', function(chunk) { 
    req.rawBody += chunk;
  });

  req.on('end', function() {
    next();
  });
});
app.use(express.bodyParser());

That middleware will read from the actual data stream, and store it in the rawBody property of the request. You can then access the raw body like this:

app.post('/', function(req, res) {
  // do something with req.rawBody
  // use req.body for the parsed body
});

Edit: It seems that this method and bodyParser refuse to coexist, because one will consume the request stream before the other, leading to whichever one is second to never fire end, thus never calling next(), and hanging your application.

The simplest solution would most likely be to modify the source of bodyParser, which you would find on line 57 of Connect's JSON parser. This is what the modified version would look like.

var buf = '';
req.setEncoding('utf8');
req.on('data', function(chunk){ buf += chunk });
req.on('end', function() {
  req.rawBody = buf;
  var first = buf.trim()[0];
  ...
});

You would find the file at this location:

/node_modules/express/node_modules/connect/lib/middleware/json.js.

How to enable zoom controls and pinch zoom in a WebView?

Inside OnCreate, add:

 webview.getSettings().setSupportZoom(true);
 webview.getSettings().setBuiltInZoomControls(true);
 webview.getSettings().setDisplayZoomControls(false);

Inside the html document, add:

<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2, user-scalable=yes">
</head>
</html>

Inside javascript, omit:

//event.preventDefault ? event.preventDefault() : (event.returnValue = false);

MySQL Delete all rows from table and reset ID to zero

If you cannot use TRUNCATE (e.g. because of foreign key constraints) you can use an alter table after deleting all rows to restart the auto_increment:

ALTER TABLE mytable AUTO_INCREMENT = 1

Jquery how to find an Object by attribute in an Array

If your array is actually a set of JQuery objects, what about simply using the .filter() method ?

purposeObjects.filter('[purpose="daily"]')

How to append one file to another in Linux from the shell?

Another solution:

cat file1 | tee -a file2

tee has the benefit that you can append to as many files as you like, for example:

cat file1 | tee -a file2 file3 file3

will append the contents of file1 to file2, file3 and file4.

From the man page:

-a, --append
       append to the given FILEs, do not overwrite

Copy mysql database from remote server to local computer

Please check this gist.

https://gist.github.com/ecdundar/789660d830d6d40b6c90

#!/bin/bash

# copymysql.sh

# GENERATED WITH USING ARTUR BODERA S SCRIPT
# Source script at: https://gist.github.com/2215200

MYSQLDUMP="/usr/bin/mysqldump"
MYSQL="/usr/bin/mysql"

REMOTESERVERIP=""
REMOTESERVERUSER=""
REMOTESERVERPASSWORD=""
REMOTECONNECTIONSTR="-h ${REMOTESERVERIP} -u ${REMOTESERVERUSER} --password=${REMOTESERVERPASSWORD} "

LOCALSERVERIP=""
LOCALSERVERUSER=""
LOCALSERVERPASSWORD=""
LOCALCONNECTION="-h ${LOCALSERVERIP} -u ${LOCALSERVERUSER} --password=${LOCALSERVERPASSWORD} "

IGNOREVIEWS=""
MYVIEWS=""
IGNOREDATABASES="select schema_name from information_schema.SCHEMATA where schema_name != 'information_schema' and schema_name != 'mysql' and schema_name != 'performance_schema'  ;"

# GET A LIST OF DATABASES
databases=`$MYSQL $REMOTECONNECTIONSTR -e "${IGNOREDATABASES}" | tr -d "| " | grep -v schema_name`

# COPY ALL TABLES
for db in $databases; do
    # GET LIST OF ITEMS
    views=`$MYSQL $REMOTECONNECTIONSTR --batch -N -e "select table_name from information_schema.tables where table_type='VIEW' and table_schema='$db';"
    IGNOREVIEWS=""
    for view in $views; do
        IGNOREVIEWS=${IGNOREVIEWS}" --ignore-table=$db.$view " 
    done
    echo "TABLES "$db
    $MYSQL $LOCALCONNECTION --batch -N -e "create database $db; "
    $MYSQLDUMP $REMOTECONNECTIONSTR $IGNOREVIEWS --compress --quick --extended-insert  --skip-add-locks --skip-comments --skip-disable-keys --default-character-set=latin1 --skip-triggers --single-transaction  $db | mysql $LOCALCONNECTION  $db 
done

# COPY ALL PROCEDURES
for db in $databases; do
    echo "PROCEDURES "$db
    #PROCEDURES
    $MYSQLDUMP $REMOTECONNECTIONSTR --compress --quick --routines --no-create-info --no-data --no-create-db --skip-opt --skip-triggers $db | \
    sed -r 's/DEFINER=`[^`]+`@`[^`]+`/DEFINER=CURRENT_USER/g' | mysql $LOCALCONNECTION  $db 
done

# COPY ALL TRIGGERS
for db in $databases; do
    echo "TRIGGERS "$db
    #TRIGGERS
    $MYSQLDUMP $REMOTECONNECTIONSTR  --compress --quick --no-create-info --no-data --no-create-db --skip-opt --triggers $db | \
    sed -r 's/DEFINER=`[^`]+`@`[^`]+`/DEFINER=CURRENT_USER/g' | mysql $LOCALCONNECTION  $db 
done

# COPY ALL VIEWS
for db in $databases; do
    # GET LIST OF ITEMS
    views=`$MYSQL $REMOTECONNECTIONSTR --batch -N -e "select table_name from information_schema.tables where table_type='VIEW' and table_schema='$db';"`
    MYVIEWS=""
    for view in $views; do
        MYVIEWS=${MYVIEWS}" "$view" " 
    done
    echo "VIEWS "$db    
    if [ -n "$MYVIEWS" ]; then
      #VIEWS
      $MYSQLDUMP $REMOTECONNECTIONSTR --compress --quick -Q -f --no-data --skip-comments --skip-triggers --skip-opt --no-create-db --complete-insert --add-drop-table $db $MYVIEWS | \
      sed -r 's/DEFINER=`[^`]+`@`[^`]+`/DEFINER=CURRENT_USER/g'  | mysql $LOCALCONNECTION  $db  
    fi    
done

echo   "OK!"

how to create a list of lists

First of all do not use list as a variable name- that is a builtin function.

I'm not super clear of what you're asking (a little more context would help), but maybe this is helpful-

my_list = []
my_list.append(np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1))
my_list.append(np.genfromtxt('temp2.txt', usecols=3, dtype=[('floatname','float')], skip_header=1))

That will create a list (a type of mutable array in python) called my_list with the output of the np.getfromtext() method in the first 2 indexes.

The first can be referenced with my_list[0] and the second with my_list[1]

Bypass popup blocker on window.open when JQuery event.preventDefault() is set

The observation that the event had to be initiated by the user helped me to figure out the first part of this, but even after that Chrome and Firefox still blocked the new window. The second part was adding target="_blank" to the link, which was mentioned in one comment.

In summary: you need to call window.open from an event initiated by the user, in this case clicking on a link, and that link needs to have target="_blank".

In the example below the link is using class="button-twitter".

$('.button-twitter').click(function(e) {
  e.preventDefault();
  var href = $(this).attr('href');
  var tweet_popup = window.open(href, 'tweet_popup', 'width=500,height=300');
});

What special characters must be escaped in regular expressions?

Which characters you must and which you mustn't escape indeed depends on the regex flavor you're working with.

For PCRE, and most other so-called Perl-compatible flavors, escape these outside character classes:

.^$*+?()[{\|

and these inside character classes:

^-]\

For POSIX extended regexes (ERE), escape these outside character classes (same as PCRE):

.^$*+?()[{\|

Escaping any other characters is an error with POSIX ERE.

Inside character classes, the backslash is a literal character in POSIX regular expressions. You cannot use it to escape anything. You have to use "clever placement" if you want to include character class metacharacters as literals. Put the ^ anywhere except at the start, the ] at the start, and the - at the start or the end of the character class to match these literally, e.g.:

[]^-]

In POSIX basic regular expressions (BRE), these are metacharacters that you need to escape to suppress their meaning:

.^$*[\

Escaping parentheses and curly brackets in BREs gives them the special meaning their unescaped versions have in EREs. Some implementations (e.g. GNU) also give special meaning to other characters when escaped, such as \? and +. Escaping a character other than .^$*(){} is normally an error with BREs.

Inside character classes, BREs follow the same rule as EREs.

If all this makes your head spin, grab a copy of RegexBuddy. On the Create tab, click Insert Token, and then Literal. RegexBuddy will add escapes as needed.

WCF ServiceHost access rights

Other option that work is ..,

If you change de indentity in application pool, you can run the code, the idea is change the aplication pool execution account for one account with more privileges,

For more details use this blog

https://letrasandnumeros.com/2017/11/27/http-could-not-register-url-http-80-hellowcf-your-process-does-not-have-access-rights-to-this-namespace/

How to dynamically create columns in datatable and assign values to it?

If you want to create dynamically/runtime data table in VB.Net then you should follow these steps as mentioned below :

Create Data table object.
Add columns into that data table object.
Add Rows with values into the object.

For eg.

Dim dt As New DataTable

dt.Columns.Add("Id", GetType(Integer))
dt.Columns.Add("FirstName", GetType(String))
dt.Columns.Add("LastName", GetType(String))

dt.Rows.Add(1, "Test", "data")
dt.Rows.Add(15, "Robert", "Wich")
dt.Rows.Add(18, "Merry", "Cylon")
dt.Rows.Add(30, "Tim", "Burst")

Get selected value from combo box in C# WPF

Ensure you have set the name for your ComboBox in your XAML file:

<ComboBox Height="23" Name="comboBox" />

In your code you can access selected item using SelectedItem property:

MessageBox.Show(comboBox.SelectedItem.ToString());

Chrome violation : [Violation] Handler took 83ms of runtime

"Chrome violations" don't represent errors in either Chrome or your own web app. They are instead warnings to help you improve your app. In this case, Long running JavaScript and took 83ms of runtime are alerting you there's probably an opportunity to speed up your script.

("Violation" is not the best terminology; it's used here to imply the script "violates" a pre-defined guideline, but "warning" or similar would be clearer. These messages first appeared in Chrome in early 2017 and should ideally have a "More info" prompt to elaborate on the meaning and give suggested actions to the developer. Hopefully those will be added in the future.)

jQuery loop over JSON result from AJAX Success?

you can remove the outer loop and replace this with data.data:

$.each(data.data, function(k, v) {
    /// do stuff
});

You were close:

$.each(data, function() {
  $.each(this, function(k, v) {
    /// do stuff
  });
});

You have an array of objects/maps so the outer loop iterates over those. The inner loop iterates over the properties on each object element.

include antiforgerytoken in ajax post ASP.NET MVC

I know this is an old question. But I will add my answer anyway, might help someone like me.

If you dont want to process the result from the controller's post action, like calling the LoggOff method of Accounts controller, you could do as the following version of @DarinDimitrov 's answer:

@using (Html.BeginForm("LoggOff", "Accounts", FormMethod.Post, new { id = "__AjaxAntiForgeryForm" }))
{
    @Html.AntiForgeryToken()
}

<!-- this could be a button -->
<a href="#" id="ajaxSubmit">Submit</a>

<script type="text/javascript">
    $('#ajaxSubmit').click(function () {

        $('#__AjaxAntiForgeryForm').submit();

        return false;
    });
</script>

enum Values to NSString (iOS)

This is answered here: a few suggestions on implementation

The bottom line is Objective-C is using a regular, old C enum, which is just a glorified set of integers.

Given an enum like this:

typedef enum { a, b, c } FirstThreeAlpha;

Your method would look like this:

- (NSString*) convertToString:(FirstThreeAlpha) whichAlpha {
    NSString *result = nil;

    switch(whichAlpha) {
        case a:
            result = @"a";
            break;
        case b:
            result = @"b";
            break;
        case c:
            result = @"c";
            break;

        default:
            result = @"unknown";
    }

    return result;
}

Failed to instantiate module error in Angular js

For me the solution was fixing a syntax error:

removing a unwanted semi colon in the angular.module function

How can I calculate the number of lines changed between two commits in Git?

You want the --stat option of git diff, or if you're looking to parse this in a script, the --numstat option.

git diff --stat <commit-ish> <commit-ish>

--stat produces the human-readable output you're used to seeing after merges; --numstat produces a nice table layout that scripts can easily interpret.

I somehow missed that you were looking to do this on multiple commits at the same time - that's a task for git log. Ron DeVera touches on this, but you can actually do a lot more than what he mentions. Since git log internally calls the diff machinery in order to print requested information, you can give it any of the diff stat options - not just --shortstat. What you likely want to use is:

git log --author="Your name" --stat <commit1>..<commit2>

but you can use --numstat or --shortstat as well. git log can also select commits in a variety other ways - have a look at the documentation. You might be interested in things like --since (rather than specifying commit ranges, just select commits since last week) and --no-merges (merge commits don't actually introduce changes), as well as the pretty output options (--pretty=oneline, short, medium, full...).

Here's a one-liner to get total changes instead of per-commit changes from git log (change the commit selection options as desired - this is commits by you, from commit1 to commit2):

git log --numstat --pretty="%H" --author="Your Name" commit1..commit2 | awk 'NF==3 {plus+=$1; minus+=$2} END {printf("+%d, -%d\n", plus, minus)}'

(you have to let git log print some identifying information about the commit; I arbitrarily chose the hash, then used awk to only pick out the lines with three fields, which are the ones with the stat information)

Regex that matches integers in between whitespace or start/end of string only

This just allow positive integers.

^[0-9]*[1-9][0-9]*$

fastest MD5 Implementation in JavaScript

Why not try http://phpjs.org/functions/md5/?

Unfortunately performance is limited with any emulated script, however this can render real md5 hash. Although I would advice against using md5 for passwords, as it is a fast-rendered hash.

Calling a particular PHP function on form submit

If you want to call a function on clicking of submit button then you have
to use ajax or jquery,if you want to call your php function after submission of form you can do that as :

<html>
<body>
<form method="post" action="display()">
<input type="text" name="studentname">
<input type="submit" value="click">
</form>
<?php
function display()
{
echo "hello".$_POST["studentname"];
}
if($_SERVER['REQUEST_METHOD']=='POST')
{
       display();
} 
?>
</body>
</html>

How to use Elasticsearch with MongoDB?

River is a good solution once you want to have a almost real time synchronization and general solution.

If you have data in MongoDB already and want to ship it very easily to Elasticsearch like "one-shot" you can try my package in Node.js https://github.com/itemsapi/elasticbulk.

It's using Node.js streams so you can import data from everything what is supporting streams (i.e. MongoDB, PostgreSQL, MySQL, JSON files, etc)

Example for MongoDB to Elasticsearch:

Install packages:

npm install elasticbulk
npm install mongoose
npm install bluebird

Create script i.e. script.js:

const elasticbulk = require('elasticbulk');
const mongoose = require('mongoose');
const Promise = require('bluebird');
mongoose.connect('mongodb://localhost/your_database_name', {
  useMongoClient: true
});

mongoose.Promise = Promise;

var Page = mongoose.model('Page', new mongoose.Schema({
  title: String,
  categories: Array
}), 'your_collection_name');

// stream query 
var stream = Page.find({
}, {title: 1, _id: 0, categories: 1}).limit(1500000).skip(0).batchSize(500).stream();

elasticbulk.import(stream, {
  index: 'my_index_name',
  type: 'my_type_name',
  host: 'localhost:9200',
})
.then(function(res) {
  console.log('Importing finished');
})

Ship your data:

node script.js

It's not extremely fast but it's working for millions of records (thanks to streams).

How do I call a dynamically-named method in Javascript?

you can do it like this:

function MyClass() {
    this.abc = function() {
        alert("abc");
    }
}

var myObject = new MyClass();
myObject["abc"]();

Binding a generic list to a repeater - ASP.NET

You may want to create a subRepeater.

<asp:Repeater ID="SubRepeater" runat="server" DataSource='<%# Eval("Fields") %>'>
  <ItemTemplate>
    <span><%# Eval("Name") %></span>
  </ItemTemplate>
</asp:Repeater>

You can also cast your fields

<%# ((ArrayFields)Container.DataItem).Fields[0].Name %>

Finally you could do a little CSV Function and write out your fields with a function

<%# GetAsCsv(((ArrayFields)Container.DataItem).Fields) %>

public string GetAsCsv(IEnumerable<Fields> fields)
{
  var builder = new StringBuilder();
  foreach(var f in fields)
  {
    builder.Append(f);
    builder.Append(",");
  }
  builder.Remove(builder.Length - 1);
  return builder.ToString();
}

Python socket connection timeout

For setting the Socket timeout, you need to follow these steps:

import socket
socks = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socks.settimeout(10.0) # settimeout is the attr of socks.

How to get the list of files in a directory in a shell script?

for entry in "$search_dir"/* "$work_dir"/*
do
  if [ -f "$entry" ];then
    echo "$entry"
  fi
done

EXTRACT() Hour in 24 Hour format

simple and easier solution:

select extract(hour from systimestamp) from dual;

EXTRACT(HOURFROMSYSTIMESTAMP)
-----------------------------
                           16

Make selected block of text uppercase

Highlight the text you want to uppercase. Then hit CTRL+SHIFT+P to bring up the command palette. Then start typing the word "uppercase", and you'll see the Transform to Uppercase command. Click that and it will make your text uppercase.

Whenever you want to do something in VS Code and don't know how, it's a good idea to bring up the command palette with CTRL+SHIFT+P, and try typing in a keyword for you want. Oftentimes the command will show up there so you don't have to go searching the net for how to do something.

Simple file write function in C++

Switch the order of the functions or do a forward declaration of the writefiles function and it will work I think.

Difference between BYTE and CHAR in column datatypes

I am not sure since I am not an Oracle user, but I assume that the difference lies when you use multi-byte character sets such as Unicode (UTF-16/32). In this case, 11 Bytes could account for less than 11 characters.

Also those field types might be treated differently in regard to accented characters or case, for example 'binaryField(ete) = "été"' will not match while 'charField(ete) = "été"' might (again not sure about Oracle).

Unable to install packages in latest version of RStudio and R Version.3.1.1

As @Pascal said, it is likely that you encounter problem with the firewall or/and proxy issue. As a first step, go through FAQ on the CRAN web page. After that, try to flag R with --internet2.

Sometimes it could be useful to check global options in R studio and uncheck "Use Internet Explorer library/proxy for HTTP". Tools -> Global Options -> Packages and unchecking the "Use Internet Explorer library/proxy for HTTP" option.

Hope this helps.

How do you set the Content-Type header for an HttpClient request?

Ok, it's not HTTPClient but if u can use it, WebClient is quite easy:

using (var client = new System.Net.WebClient())
 {
    client.Headers.Add("Accept", "application/json");
    client.Headers.Add("Content-Type", "application/json; charset=utf-8");
    client.DownloadString(...);
 }

Simple CSS Animation Loop – Fading In & Out "Loading" Text

As King King said, you must add the browser specific prefix. This should cover most browsers:

_x000D_

@keyframes flickerAnimation {_x000D_
  0%   { opacity:1; }_x000D_
  50%  { opacity:0; }_x000D_
  100% { opacity:1; }_x000D_
}_x000D_
@-o-keyframes flickerAnimation{_x000D_
  0%   { opacity:1; }_x000D_
  50%  { opacity:0; }_x000D_
  100% { opacity:1; }_x000D_
}_x000D_
@-moz-keyframes flickerAnimation{_x000D_
  0%   { opacity:1; }_x000D_
  50%  { opacity:0; }_x000D_
  100% { opacity:1; }_x000D_
}_x000D_
@-webkit-keyframes flickerAnimation{_x000D_
  0%   { opacity:1; }_x000D_
  50%  { opacity:0; }_x000D_
  100% { opacity:1; }_x000D_
}_x000D_
.animate-flicker {_x000D_
   -webkit-animation: flickerAnimation 1s infinite;_x000D_
   -moz-animation: flickerAnimation 1s infinite;_x000D_
   -o-animation: flickerAnimation 1s infinite;_x000D_
    animation: flickerAnimation 1s infinite;_x000D_
}

_x000D_

<div class="animate-flicker">Loading...</div>

_x000D_

Make WPF Application Fullscreen (Cover startmenu)

<Window x:Class="HTA.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    mc:Ignorable="d" 
    ResizeMode="NoResize"
    WindowStartupLocation="CenterScreen" 
    Width="1024" Height="768"
    WindowState="Maximized" WindowStyle="None">

Window state to Maximized and window style to None

Rollback to last git commit

If you want to remove newly added contents and files which are already staged (so added to the index) then you use:

git reset --hard

If you want to remove also your latest commit (is the one with the message "blah") then better to use:

git reset --hard HEAD^

To remove the untracked files (so new files not yet added to the index) and folders use:

git clean --force -d

Iterating through all nodes in XML file

To iterate through all elements

XDocument xdoc = XDocument.Load("input.xml");
foreach (XElement element in xdoc.Descendants())
{
    Console.WriteLine(element.Name);
}

How to catch SQLServer timeout exceptions

here: http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.adonet/2006-10/msg00064.html

You can read also that Thomas Weingartner wrote:

Timeout: SqlException.Number == -2 (This is an ADO.NET error code)
General Network Error: SqlException.Number == 11
Deadlock: SqlException.Number == 1205 (This is an SQL Server error code)

...

We handle the "General Network Error" as a timeout exception too. It only occurs under rare circumstances e.g. when your update/insert/delete query will raise a long running trigger.

Matplotlib connect scatterplot points with line - Python

I think @Evert has the right answer:

plt.scatter(dates,values)
plt.plot(dates, values)
plt.show()

Which is pretty much the same as

plt.plot(dates, values, '-o')
plt.show()

or whatever linestyle you prefer.

correct way to use super (argument passing)

As explained in Python's super() considered super, one way is to have class eat the arguments it requires, and pass the rest on. Thus, when the call-chain reaches object, all arguments have been eaten, and object.__init__ will be called without arguments (as it expects). So your code should look like this:

class A(object):
    def __init__(self, *args, **kwargs):
        print "A"
        super(A, self).__init__(*args, **kwargs)

class B(object):
    def __init__(self, *args, **kwargs):
        print "B"
        super(B, self).__init__(*args, **kwargs)

class C(A):
    def __init__(self, arg, *args, **kwargs):
        print "C","arg=",arg
        super(C, self).__init__(*args, **kwargs)

class D(B):
    def __init__(self, arg, *args, **kwargs):
        print "D", "arg=",arg
        super(D, self).__init__(*args, **kwargs)

class E(C,D):
    def __init__(self, arg, *args, **kwargs):
        print "E", "arg=",arg
        super(E, self).__init__(*args, **kwargs)

print "MRO:", [x.__name__ for x in E.__mro__]
E(10, 20, 30)

How to avoid 'undefined index' errors?

A short solution is this (PHP 5.3+):

$output['alternate_title'] = $output['alternate_title'] ?:'';

You get either the value of the variable, if it doesn't evaluate to false, or the false expression. (The one after the ':')

Using the ternary Operator, without the "if true" parameter, will return the result of the test expression (The first one ) Since undefined evaluates to false, the false expression will be returned.

In PHP 7 there is the slightly more elegant Null coalescing operator:

$output['alternate_title'] = $output['alternate_title'] ?? '';

(It would be nice with a default assignment operator like '?=')

Resetting a multi-stage form with jQuery

Modification of the most-voted answer for the $(document).ready() situation:

$('button[type="reset"]').click(function(e) {
    $form = $(this.form);
    $form.find('input:text, input:password, input:file, select, textarea').val('');
    $form.find('input:radio, input:checkbox').removeAttr('checked').removeAttr('selected');
    e.preventDefault();
});

What is CMake equivalent of 'configure --prefix=DIR && make all install '?

You can pass in any CMake variable on the command line, or edit cached variables using ccmake/cmake-gui. On the command line,

cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr . && make all install

Would configure the project, build all targets and install to the /usr prefix. The type (PATH) is not strictly necessary, but would cause the Qt based cmake-gui to present the directory chooser dialog.

Some minor additions as comments make it clear that providing a simple equivalence is not enough for some. Best practice would be to use an external build directory, i.e. not the source directly. Also to use more generic CMake syntax abstracting the generator.

mkdir build && cd build && cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr .. && cmake --build . --target install --config Release

You can see it gets quite a bit longer, and isn't directly equivalent anymore, but is closer to best practices in a fairly concise form... The --config is only used by multi-configuration generators (i.e. MSVC), ignored by others.

100% width background image with an 'auto' height

Just use a two color background image:

<div style="width:100%; background:url('images/bkgmid.png');
       background-size: cover;">
content
</div>

How can I get the CheckBoxList selected values, what I have doesn't seem to work C#.NET/VisualWebPart

An elegant way to implement this would be to make an extension method, like this:

public static class Extensions
{
    public static List<string> GetSelectedItems(this CheckBoxList cbl)
    {
        var result = new List<string>();

        foreach (ListItem item in cbl.Items)
            if (item.Selected)
                result.Add(item.Value);

        return result;
    }
}

I can then use something like this to compose a string will all values separated by ';':

string.Join(";", cbl.GetSelectedItems());

Verify if file exists or not in C#

Simple answer is that you can't - you won't be able to check a for a file on their machine from an ASP website, as to do so would be a dangerous risk for them.

You have to give them a file upload control - and there's not much you can do with that control. For security reasons javascript can't really touch it.

<asp:FileUpload ID="FileUpload1" runat="server" />

They then pick a file to upload, and you have to deal with any empty file that they might send up server side.

Passing parameters to JavaScript files

You use Global variables :-D.

Like this:

<script type="text/javascript">
   var obj1 = "somevalue";
   var obj2 = "someothervalue";
</script>
<script type="text/javascript" src="file.js"></script">

The JavaScript code in 'file.js' can access to obj1 and obj2 without problem.

EDIT Just want to add that if 'file.js' wants to check if obj1 and obj2 have even been declared you can use the following function.

function IsDefined($Name) {
    return (window[$Name] != undefined);
}

Hope this helps.

What properties can I use with event.target?

window.onclick = e => {
    console.dir(e.target);  // use this in chrome
    console.log(e.target);  // use this in firefox - click on tag name to view 
}

take advantage of using filter propeties

e.target.tagName
e.target.className
e.target.style.height  // its not the value applied from the css style sheet, to get that values use `getComputedStyle()`

Maven in Eclipse: step by step installation

By "use install a Maven plugin and use it" I am sure you are looking for a Eclipse plugin that will perform Maven functions within the IDE. If so, M2E is a good choice. You will find a lot of help within the Eclipse installation once you install M2E.

That said -- considering that you are starting off using Maven -- it would go a long way to have a good understanding of the basic concepts. Using M2E could hide some of the details which could lead to incomplete or incorrect interpretation of Maven's behavior and therefore problems downstream.

Some good Maven online references are:

Maven's own documentation -- which you have found. Be sure to see the docs of the plugins that you use
Sonatype's Maven book

fork() child and parent processes

It is printing the statement twice because it is printing it for both the parent and the child. The parent has a parent id of 0

Try something like this:

 pid_t  pid;
 pid = fork();
 if (pid == 0) 
    printf("This is the child process. My pid is %d and my parent's id is %d.\n", getpid(),getppid());
 else 
    printf("This is the parent process. My pid is %d and my parent's id is %d.\n", getpid(), getppid() );

How to make div fixed after you scroll to that div?

jquery function is most important

<script>
$(function(){
    var stickyHeaderTop = $('#stickytypeheader').offset().top;

    $(window).scroll(function(){
            if( $(window).scrollTop() > stickyHeaderTop ) {
                    $('#stickytypeheader').css({position: 'fixed', top: '0px'});
                    $('#sticky').css('display', 'block');
            } else {
                    $('#stickytypeheader').css({position: 'static', top: '0px'});
                    $('#sticky').css('display', 'none');
            }
    });
});
</script>

Then use JQuery Lib...

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>

Now use HTML

<div id="header">
    <p>This text is non sticky</p>
    <p>This text is non sticky</p>
    <p>This text is non sticky</p>
    <p>This text is non sticky</p>
 </div>

<div id="stickytypeheader">
 <table width="100%">
  <tr>
    <td><a href="http://growthpages.com/">Growth pages</a></td>

    <td><a href="http://google.com/">Google</a></td>

    <td><a href="http://yahoo.com/">Yahoo</a></td>

    <td><a href="http://www.bing.com/">Bing</a></td>

    <td><a href="#">Visitor</a></td>
  </tr>
 </table>
</div>

<div id="content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna
aliqua. Ut enim ad minim veniam, quis nostrud exercitation
ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis
aute irure dolor in reprehenderit in voluptate velit esse
cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
cupidatat non proident, sunt in culpa qui officia deserunt
mollit anim id est laborum.</p>
</div>

Check DEMO HERE

Getting permission denied (public key) on gitlab

I had the same problems, It has been fixed after I re-generate the ssh key inside .ssh folder without naming it (keep it as id_rsa.pub). Then add it again to gitlab ssh key. Everything working fine now.

Grep to find item in Perl array

You seem to be using grep() like the Unix grep utility, which is wrong.

Perl's grep() in scalar context evaluates the expression for each element of a list and returns the number of times the expression was true. So when $match contains any "true" value, grep($match, @array) in scalar context will always return the number of elements in @array.

Instead, try using the pattern matching operator:

if (grep /$match/, @array) {
    print "found it\n";
}

Visual Studio Code includePath

For everybody that falls off google, in here, this is the fix for VSCode 1.40 (2019):

Open the global settings.json: File > Preferences > Settings

Then select the tab 'User', open the section 'Extensions', click on 'C/C++'. Then scroll the right panel till you find a 'Edit in settings.json' button.

Last, you add the "C_Cpp.default.includePath" section. The code provided there is from my own system (Windows 7). You can use it as a base for your own libraries paths. (Remember to change the YOUR USERNAME to your correct system (my case windows) username)
(edit info: There is a problem with the recursion of my approach. VSCode doesn't like multiple definitions for the same thing. I solved it with "C_Cpp.intelliSenseEngine": "Tag Parser" )

the code before line 7, on the settings.json has nothing to do with arduino or includePath. You may not copy that...

JSON section to add to settings.json:

"C_Cpp.default.includePath": [
        "C:/Program Files (x86)/Arduino/libraries/**",
        "C:/Program Files (x86)/Arduino/hardware/arduino/avr/cores/arduino/**",
        "C:/Program Files (x86)/Arduino/hardware/tools/avr/avr/include/**",
        "C:/Program Files (x86)/Arduino/hardware/tools/avr/lib/gcc/avr/5.4.0/include/**",
        "C:/Program Files (x86)/Arduino/hardware/arduino/avr/variants/standard/**",
        "C:/Users/<YOUR USERNAME>/.platformio/packages/framework-arduinoavr/**",
        "C:/Users/<YOUR USERNAME>/Documents/Arduino/libraries/**",
        "{$workspaceFolder}/libraries/**",
        "{$workspaceFolder}/**"
    ],
"C_Cpp.intelliSenseEngine": "Tag Parser"

how to change onclick event with jquery?

You can easily change the onclick event of an element with jQuery without running the new function with:

$("#id").attr("onclick","new_function_name()");

By writing this line you actually change the onclick attribute of #id.

You can also use:

document.getElementById("id").attribute("onclick","new_function_name()");

Removing elements with Array.map in JavaScript

You must note however that the Array.filter is not supported in all browser so, you must to prototyped:

//This prototype is provided by the Mozilla foundation and
//is distributed under the MIT license.
//http://www.ibiblio.org/pub/Linux/LICENSES/mit.license

if (!Array.prototype.filter)
{
    Array.prototype.filter = function(fun /*, thisp*/)
    {
        var len = this.length;

        if (typeof fun != "function")
            throw new TypeError();

        var res = new Array();
        var thisp = arguments[1];

        for (var i = 0; i < len; i++)
        {
            if (i in this)
            {
                var val = this[i]; // in case fun mutates this

                if (fun.call(thisp, val, i, this))
                   res.push(val);
            }
        }

        return res;
    };
}

And doing so, you can prototype any method you may need.

fatal: early EOF fatal: index-pack failed

I had the same problem, I even tried to download the project directly from the website as a zip file but the download got interrupted at the exact same percent.

This single line fixed my problem like a charm

git config --global core.compression 0

I know other answers have mentioned this but, no one here mentioned that this line alone can fix the problem.

Hope it helps.

Remove an array element and shift the remaining ones

You just need to overwrite what you're deleting with the next value in the array, propagate that change, and then keep in mind where the new end is:

int array[] = {1, 2, 3, 4, 5, 6, 7, 8, 9};

// delete 3 (index 2)
for (int i = 2; i < 8; ++i)
    array[i] = array[i + 1]; // copy next element left

Now your array is {1, 2, 4, 5, 6, 7, 8, 9, 9}. You cannot delete the extra 9 since this is a statically-sized array, you just have to ignore it. This can be done with std::copy:

std::copy(array + 3, // copy everything starting here
          array + 9, // and ending here, not including it,
          array + 2) // to this destination

In C++11, use can use std::move (the algorithm overload, not the utility overload) instead.

More generally, use std::remove to remove elements matching a value:

// remove *all* 3's, return new ending (remaining elements unspecified)
auto arrayEnd = std::remove(std::begin(array), std::end(array), 3);

Even more generally, there is std::remove_if.

Note that the use of std::vector<int> may be more appropriate here, as its a "true" dynamically-allocated resizing array. (In the sense that asking for its size() reflects removed elements.)

Remove last specific character in a string c#

Try below

Something..TrimEnd(",".ToCharArray());

Fatal error: Uncaught Error: Call to undefined function mysql_connect()

mysql_ functions have been removed from PHP 7. You can now use MySQLi or PDO.

MySQLi example:

mysqli_connect($mysql_hostname, $mysql_username, $mysql_password, $mysql_dbname);

mysqli_connect reference link

Turn a string into a valid filename?

You could use the re.sub() method to replace anything not "filelike". But in effect, every character could be valid; so there are no prebuilt functions (I believe), to get it done.

import re

str = "File!name?.txt"
f = open(os.path.join("/tmp", re.sub('[^-a-zA-Z0-9_.() ]+', '', str))

Would result in a filehandle to /tmp/filename.txt.

HTML for the Pause symbol in audio and video control

The ISO 7000 / IEC 60417 Symbol for Pause; Interruption is #5111B. See Media_Controls

What does Include() do in LINQ?

I just wanted to add that "Include" is part of eager loading. It is described in Entity Framework 6 tutorial by Microsoft. Here is the link: https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/reading-related-data-with-the-entity-framework-in-an-asp-net-mvc-application

Excerpt from the linked page:

Here are several ways that the Entity Framework can load related data into the navigation properties of an entity:

Lazy loading. When the entity is first read, related data isn't retrieved. However, the first time you attempt to access a navigation property, the data required for that navigation property is automatically retrieved. This results in multiple queries sent to the database — one for the entity itself and one each time that related data for the entity must be retrieved. The DbContext class enables lazy loading by default.

Eager loading. When the entity is read, related data is retrieved along with it. This typically results in a single join query that retrieves all of the data that's needed. You specify eager loading by using the Include method.

Explicit loading. This is similar to lazy loading, except that you explicitly retrieve the related data in code; it doesn't happen automatically when you access a navigation property. You load related data manually by getting the object state manager entry for an entity and calling the Collection.Load method for collections or the Reference.Load method for properties that hold a single entity. (In the following example, if you wanted to load the Administrator navigation property, you'd replace Collection(x => x.Courses) with Reference(x => x.Administrator).) Typically you'd use explicit loading only when you've turned lazy loading off.

Because they don't immediately retrieve the property values, lazy loading and explicit loading are also both known as deferred loading.

How to type in textbox using Selenium WebDriver (Selenium 2) with Java?

Thanks Friend, i got an answer. This is only possible because of your help. you all give me a ray of hope towards resolving this problem.

Here is the code:

package facebook;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;

public class Facebook {
    public static void main(String args[]){
        WebDriver driver = new FirefoxDriver();
        driver.get("http://www.facebook.com");
        WebElement email= driver.findElement(By.id("email"));
        Actions builder = new Actions(driver);
        Actions seriesOfActions = builder.moveToElement(email).click().sendKeys(email, "[email protected]");
        seriesOfActions.perform();
        WebElement pass = driver.findElement(By.id("pass"));
        WebElement login =driver.findElement(By.id("u_0_b"));
        Actions seriesOfAction = builder.moveToElement(pass).click().sendKeys(pass, "naveench").click(login);
        seriesOfAction.perform();
        driver.
    }    
}

MySQL count occurrences greater than 2

The HAVING option can be used for this purpose and query should be

SELECT word, COUNT(*) FROM words 
GROUP BY word
HAVING COUNT(*) > 1;

How to delete only the content of file in python

You can do this:

def deleteContent(pfile):
    fn=pfile.name 
    pfile.close()
    return open(fn,'w')

jQuery/JavaScript to replace broken images

This is a crappy technique, but it's pretty much guaranteed:

<img onerror="this.parentNode.removeChild(this);">

How to get hostname from IP (Linux)?

In order to use nslookup, host or gethostbyname() then the target's name will need to be registered with DNS or statically defined in the hosts file on the machine running your program. Yes, you could connect to the target with SSH or some other application and query it directly, but for a generic solution you'll need some sort of DNS entry for it.

Access a function variable outside the function without using "global"

You could do something along these lines (which worked in both Python v2.7.17 and v3.8.1 when I tested it/them):

def hi():
    # other code...
    hi.bye = 42  # Create function attribute.
    sigh = 10

hi()
print(hi.bye)  # -> 42

Functions are objects in Python and can have arbitrary attributes assigned to them.

If you're going to be doing this kind of thing often, you could implement something more generic by creating a function decorator that adds a this argument to each call to the decorated function.

This additional argument will give functions a way to reference themselves without needing to explicitly embed (hardcode) their name into the rest of the definition and is similar to the instance argument that class methods automatically receive as their first argument which is usually named self — I picked something different to avoid confusion, but like the self argument, it can be named whatever you wish.

Here's an example of that approach:

def add_this_arg(func):
    def wrapped(*args, **kwargs):
        return func(wrapped, *args, **kwargs)
    return wrapped

@add_this_arg
def hi(this, that):
    # other code...
    this.bye = 2 * that  # Create function attribute.
    sigh = 10

hi(21)
print(hi.bye)  # -> 42

Note

This doesn't work for class methods. Just use the self argument already passed being passed to instead of the method name. You can reference class-level attributes through type(self). See Function's attributes when in a class.

Good ways to sort a queryset? - Django

I just wanted to illustrate that the built-in solutions (SQL-only) are not always the best ones. At first I thought that because Django's QuerySet.objects.order_by method accepts multiple arguments, you could easily chain them:

ordered_authors = Author.objects.order_by('-score', 'last_name')[:30]

But, it does not work as you would expect. Case in point, first is a list of presidents sorted by score (selecting top 5 for easier reading):

>>> auths = Author.objects.order_by('-score')[:5]
>>> for x in auths: print x
... 
James Monroe (487)
Ulysses Simpson (474)
Harry Truman (471)
Benjamin Harrison (467)
Gerald Rudolph (464)

Using Alex Martelli's solution which accurately provides the top 5 people sorted by last_name:

>>> for x in sorted(auths, key=operator.attrgetter('last_name')): print x
... 
Benjamin Harrison (467)
James Monroe (487)
Gerald Rudolph (464)
Ulysses Simpson (474)
Harry Truman (471)

And now the combined order_by call:

>>> myauths = Author.objects.order_by('-score', 'last_name')[:5]
>>> for x in myauths: print x
... 
James Monroe (487)
Ulysses Simpson (474)
Harry Truman (471)
Benjamin Harrison (467)
Gerald Rudolph (464)

As you can see it is the same result as the first one, meaning it doesn't work as you would expect.

How to list files and folder in a dir (PHP)

PHP 5 has the RecursiveDirectoryIterator.

The manual has a basic example:

<?php

$directory = '/system/infomation/';

$it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory));

while($it->valid()) {

    if (!$it->isDot()) {

        echo 'SubPathName: ' . $it->getSubPathName() . "\n";
        echo 'SubPath:     ' . $it->getSubPath() . "\n";
        echo 'Key:         ' . $it->key() . "\n\n";
    }

    $it->next();
}

?>

Edit -- Here's a slightly more advanced example (only slightly) which produces output similar to what you want (i.e. folder names then files).

// Create recursive dir iterator which skips dot folders
$dir = new RecursiveDirectoryIterator('./system/information',
    FilesystemIterator::SKIP_DOTS);

// Flatten the recursive iterator, folders come before their files
$it  = new RecursiveIteratorIterator($dir,
    RecursiveIteratorIterator::SELF_FIRST);

// Maximum depth is 1 level deeper than the base folder
$it->setMaxDepth(1);

// Basic loop displaying different messages based on file or folder
foreach ($it as $fileinfo) {
    if ($fileinfo->isDir()) {
        printf("Folder - %s\n", $fileinfo->getFilename());
    } elseif ($fileinfo->isFile()) {
        printf("File From %s - %s\n", $it->getSubPath(), $fileinfo->getFilename());
    }
}

iOS 7's blurred overlay effect using CSS?

Check this one out http://codepen.io/GianlucaGuarini/pen/Hzrhf Seems like it does the effect without duplication the background image of the element under itself. See texts are blurring also in the example.

Vague.js

var vague = $blurred.find('iframe').Vague({
  intensity:5 //blur intensity
});
vague.blur();

How to name an object within a PowerPoint slide?

THIS IS NOT AN ANSWER TO THE ORIGINAL QUESTION, IT'S AN ANSWER TO @Teddy's QUESTION IN @Dudi's ANSWER'S COMMENTS

Here's a way to list id's in the active presentation to the immediate window (Ctrl + G) in VBA editor:

Sub ListAllShapes()

    Dim curSlide As Slide
    Dim curShape As Shape

    For Each curSlide In ActivePresentation.Slides
        Debug.Print curSlide.SlideID
        For Each curShape In curSlide.Shapes

                If curShape.TextFrame.HasText Then
                    Debug.Print curShape.Id
                End If

        Next curShape
    Next curSlide
End Sub

SQL Server equivalent of MySQL's NOW()?

You can also use CURRENT_TIMESTAMP, if you feel like being more ANSI compliant (though if you're porting code between database vendors, that'll be the least of your worries). It's exactly the same as GetDate() under the covers (see this question for more on that).

There's no ANSI equivalent for GetUTCDate(), however, which is probably the one you should be using if your app operates in more than a single time zone ...

How to generate service reference with only physical wsdl file

There are two ways to go about this. You can either use the IDE to generate a WSDL, or you can do it via the command line.

1. To create it via the IDE:

In the solution explorer pane, right click on the project that you would like to add the Service to:

Then, you can enter the path to your service WSDL and hit go:

2. To create it via the command line:

Open a VS 2010 Command Prompt (Programs -> Visual Studio 2010 -> Visual Studio Tools)
Then execute:

WSDL /verbose C:\path\to\wsdl

WSDL.exe will then output a .cs file for your consumption.

If you have other dependencies that you received with the file, such as xsd's, add those to the argument list:

WSDL /verbose C:\path\to\wsdl C:\path\to\some\xsd C:\path\to\some\xsd

If you need VB output, use /language:VB in addition to the /verbose.

Notification not showing in Oreo

Following method will show Notification, having big text and freeze enabled( Notification will not get removed even after user swipes ). We need NotificationManager service

public static void showNotificationOngoing(Context context,String title) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);

        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);

        Notification.Builder notificationBuilder = new Notification.Builder(context)
                .setContentTitle(title + DateFormat.getDateTimeInstance().format(new Date()) + ":" + accuracy)
                .setContentText(addressFragments.toString())
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentIntent(contentIntent)
                .setOngoing(true)
                .setStyle(new Notification.BigTextStyle().bigText(addressFragments.toString()))
                .setAutoCancel(true);
        notificationManager.notify(3, notificationBuilder.build());
}

Method to Remove Notifications

public static void removeNotification(Context context){
    NotificationManager notificationManager =
            (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
    notificationManager.cancelAll();
}

Source Link

How do I get a TextBox to only accept numeric input in WPF?

I modified Rays answer to handle the highlighted text prior to checking the regular expression. I also adjusted the regular expression to only allow for two decimal places (currency).

private static readonly Regex _regex = new Regex(@"^[0-9]\d*(\.\d{0,2})?$");
private static bool IsTextAllowed(string text)
{
    return _regex.IsMatch(text);
}

private bool IsAllowed(TextBox tb, string text)
{
    bool isAllowed = true;
    if (tb != null)
    {
        string currentText = tb.Text;
        if (!string.IsNullOrEmpty(tb.SelectedText))
            currentText = currentText.Remove(tb.CaretIndex, tb.SelectedText.Length);
        isAllowed = IsTextAllowed(currentText.Insert(tb.CaretIndex, text));
    }
    return isAllowed;
}

private void Txt_PreviewCurrencyTextInput(object sender, TextCompositionEventArgs e)
{
    e.Handled = !IsAllowed(sender as TextBox, e.Text);            
}


private void TextBoxPasting(object sender, DataObjectPastingEventArgs e)
{
    if (e.DataObject.GetDataPresent(typeof(String)))
    {
        String text = (String)e.DataObject.GetData(typeof(String));
        if (!IsAllowed(sender as TextBox, text))
            e.CancelCommand();
    }
    else
        e.CancelCommand();
}

And the xaml

<TextBox Name="Txt_Textbox" PreviewTextInput="Txt_PreviewCurrencyTextInput"  DataObject.Pasting="TextBoxPasting" />

How to DROP multiple columns with a single ALTER TABLE statement in SQL Server?

The Syntax as specified by Microsoft for the dropping a column part of an ALTER statement is this

 DROP 
 {
     [ CONSTRAINT ] 
     { 
          constraint_name 
          [ WITH 
           ( <drop_clustered_constraint_option> [ ,...n ] ) 
          ] 
      } [ ,...n ]
      | COLUMN 
      {
          column_name 
      } [ ,...n ]
 } [ ,...n ]

Notice that the [,...n] appears after both the column name and at the end of the whole drop clause. What this means is that there are two ways to delete multiple columns. You can either do this:

ALTER TABLE TableName
    DROP COLUMN Column1, Column2, Column3

or this

ALTER TABLE TableName
    DROP 
        COLUMN Column1,
        COLUMN Column2,
        COLUMN Column3

This second syntax is useful if you want to combine the drop of a column with dropping a constraint:

ALTER TBALE TableName
    DROP
        CONSTRAINT DF_TableName_Column1,
        COLUMN Column1;

When dropping columns SQL Sever does not reclaim the space taken up by the columns dropped. For data types that are stored inline in the rows (int for example) it may even take up space on the new rows added after the alter statement. To get around this you need to create a clustered index on the table or rebuild the clustered index if it already has one. Rebuilding the index can be done with a REBUILD command after modifying the table. But be warned this can be slow on very big tables. For example:

ALTER TABLE Test
    REBUILD;

Switch statement fallthrough in C#?

To add to the answers here, I think it's worth considering the opposite question in conjunction with this, viz. why did C allow fall-through in the first place?

Any programming language of course serves two goals:

Provide instructions to the computer.
Leave a record of the intentions of the programmer.

The creation of any programming language is therefore a balance between how to best serve these two goals. On the one hand, the easier it is to turn into computer instructions (whether those are machine code, bytecode like IL, or the instructions are interpreted on execution) then more able that process of compilation or interpretation will be to be efficient, reliable and compact in output. Taken to its extreme, this goal results in our just writing in assembly, IL, or even raw op-codes, because the easiest compilation is where there is no compilation at all.

Conversely, the more the language expresses the intention of the programmer, rather than the means taken to that end, the more understandable the program both when writing and during maintenance.

Now, switch could always have been compiled by converting it into the equivalent chain of if-else blocks or similar, but it was designed as allowing compilation into a particular common assembly pattern where one takes a value, computes an offset from it (whether by looking up a table indexed by a perfect hash of the value, or by actual arithmetic on the value*). It's worth noting at this point that today, C# compilation will sometimes turn switch into the equivalent if-else, and sometimes use a hash-based jump approach (and likewise with C, C++, and other languages with comparable syntax).

In this case there are two good reasons for allowing fall-through:

It just happens naturally anyway: if you build a jump table into a set of instructions, and one of the earlier batches of instructions doesn't contain some sort of jump or return, then execution will just naturally progress into the next batch. Allowing fall-through was what would "just happen" if you turned the switch-using C into jump-table–using machine code.
Coders who wrote in assembly were already used to the equivalent: when writing a jump table by hand in assembly, they would have to consider whether a given block of code would end with a return, a jump outside of the table, or just continue on to the next block. As such, having the coder add an explicit break when necessary was "natural" for the coder too.

At the time therefore, it was a reasonable attempt to balance the two goals of a computer language as it relates to both the produced machine code, and the expressiveness of the source code.

Four decades later though, things are not quite the same, for a few reasons:

Coders in C today may have little or no assembly experience. Coders in many other C-style languages are even less likely to (especially Javascript!). Any concept of "what people are used to from assembly" is no longer relevant.
Improvements in optimisations mean that the likelihood of switch either being turned into if-else because it was deemed the approach likely to be most efficient, or else turned into a particularly esoteric variant of the jump-table approach are higher. The mapping between the higher- and lower-level approaches is not as strong as it once was.
Experience has shown that fall-through tends to be the minority case rather than the norm (a study of Sun's compiler found 3% of switch blocks used a fall-through other than multiple labels on the same block, and it was thought that the use-case here meant that this 3% was in fact much higher than normal). So the language as studied make the unusual more readily catered-to than the common.
Experience has shown that fall-through tends to be the source of problems both in cases where it is accidentally done, and also in cases where correct fall-through is missed by someone maintaining the code. This latter is a subtle addition to the bugs associated with fall-through, because even if your code is perfectly bug-free, your fall-through can still cause problems.

Related to those last two points, consider the following quote from the current edition of K&R:

Falling through from one case to another is not robust, being prone to disintegration when the program is modified. With the exception of multiple labels for a single computation, fall-throughs should be used sparingly, and commented.

As a matter of good form, put a break after the last case (the default here) even though it's logically unnecessary. Some day when another case gets added at the end, this bit of defensive programming will save you.

So, from the horse's mouth, fall-through in C is problematic. It's considered good practice to always document fall-throughs with comments, which is an application of the general principle that one should document where one does something unusual, because that's what will trip later examination of the code and/or make your code look like it has a novice's bug in it when it is in fact correct.

And when you think about it, code like this:

switch(x)
{
  case 1:
   foo();
   /* FALLTHRU */
  case 2:
    bar();
    break;
}

Is adding something to make the fall-through explicit in the code, it's just not something that can be detected (or whose absence can be detected) by the compiler.

As such, the fact that on has to be explicit with fall-through in C# doesn't add any penalty to people who wrote well in other C-style languages anyway, since they would already be explicit in their fall-throughs.†

Finally, the use of goto here is already a norm from C and other such languages:

switch(x)
{
  case 0:
  case 1:
  case 2:
    foo();
    goto below_six;
  case 3:
    bar();
    goto below_six;
  case 4:
    baz();
    /* FALLTHRU */
  case 5:
  below_six:
    qux();
    break;
  default:
    quux();
}

In this sort of case where we want a block to be included in the code executed for a value other than just that which brings one to the preceding block, then we're already having to use goto. (Of course, there are means and ways of avoiding this with different conditionals but that's true of just about everything relating to this question). As such C# built on the already normal way to deal with one situation where we want to hit more than one block of code in a switch, and just generalised it to cover fall-through as well. It also made both cases more convenient and self-documenting, since we have to add a new label in C but can use the case as a label in C#. In C# we can get rid of the below_six label and use goto case 5 which is clearer as to what we are doing. (We'd also have to add break for the default, which I left out just to make the above C code clearly not C# code).

In summary therefore:

C# no longer relates to unoptimised compiler output as directly as C code did 40 years ago (nor does C these days), which makes one of the inspirations of fall-through irrelevant.
C# remains compatible with C in not just having implicit break, for easier learning of the language by those familiar with similar languages, and easier porting.
C# removes a possible source of bugs or misunderstood code that has been well-documented as causing problems for the last four decades.
C# makes existing best-practice with C (document fall through) enforceable by the compiler.
C# makes the unusual case the one with more explicit code, the usual case the one with the code one just writes automatically.
C# uses the same goto-based approach for hitting the same block from different case labels as is used in C. It just generalises it to some other cases.
C# makes that goto-based approach more convenient, and clearer, than it is in C, by allowing case statements to act as labels.

All in all, a pretty reasonable design decision

*Some forms of BASIC would allow one to do the likes of GOTO (x AND 7) * 50 + 240 which while brittle and hence a particularly persuasive case for banning goto, does serve to show a higher-language equivalent of the sort of way that lower-level code can make a jump based on arithmetic upon a value, which is much more reasonable when it's the result of compilation rather than something that has to be maintained manually. Implementations of Duff's Device in particular lend themselves well to the equivalent machine code or IL because each block of instructions will often be the same length without needing the addition of nop fillers.

†Duff's Device comes up here again, as a reasonable exception. The fact that with that and similar patterns there's a repetition of operations serves to make the use of fall-through relatively clear even without an explicit comment to that effect.

React Native absolute positioning horizontal centre

<View style={{...StyleSheet.absoluteFillObject, justifyContent: 'center', alignItems: 'center'}}>
  <Text>CENTERD TEXT</Text>
</View>

And add this

import {StyleSheet} from 'react-native';

powershell - list local users and their groups

Expanding on mjswensen's answer, the command without the filter could take minutes, but the filtered command is almost instant.

PowerShell - List local user accounts

Fast way

Get-WmiObject -Class Win32_UserAccount -Filter  "LocalAccount='True'" | select name, fullname

Slow way

Get-WmiObject -Class Win32_UserAccount |? {$_.localaccount -eq $true} | select name, fullname

How can I disable mod_security in .htaccess file?

Just to update this question for mod_security 2.7.0+ - they turned off the ability to mitigate modsec via htaccess unless you compile it with the --enable-htaccess-config flag. Most hosts do not use this compiler option since it allows too lax security. Instead, vhosts in httpd.conf are your go-to option for controlling modsec.

Even if you do compile modsec with htaccess mitigation, there are less directives available. SecRuleEngine can no longer be used there for example. Here is a list that is available to use by default in htaccess if allowed (keep in mind a host may further limit this list with AllowOverride):

    - SecAction
    - SecRule

    - SecRuleRemoveByMsg
    - SecRuleRemoveByTag
    - SecRuleRemoveById

    - SecRuleUpdateActionById
    - SecRuleUpdateTargetById
    - SecRuleUpdateTargetByTag
    - SecRuleUpdateTargetByMsg

More info on the official modsec wiki

As an additional note for 2.x users: the IfModule should now look for mod_security2.c instead of the older mod_security.c

How to check if a double value has no decimal part

double d = 14.4;
if((d-(int)d)!=0)
    System.out.println("decimal value is there");
else
    System.out.println("decimal value is not there");

How to create an integer-for-loop in Ruby?

If you're doing this in your erb view (for Rails), be mindful of the <% and <%= differences. What you'd want is:

<% (1..x).each do |i| %>
  Code to display using <%= stuff %> that you want to display    
<% end %>

For plain Ruby, you can refer to: http://www.tutorialspoint.com/ruby/ruby_loops.htm

Allow anything through CORS Policy

Try configuration at /config/application.rb:

config.middleware.insert_before 0, "Rack::Cors" do
  allow do
    origins '*'
    resource '*', :headers => :any, :methods => [:get, :post, :options, :delete, :put, :patch], credentials: true
  end
end

How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?

DateTime.strptime can handle seconds since epoch. The number must be converted to a string:

require 'date'
DateTime.strptime("1318996912",'%s')

Can't install laravel installer via composer

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

sudo apt-get install php-zip

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

sudo apt-get install phpX-zip

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

Sanitizing user input before adding it to the DOM in Javascript

Never use escape(). It's nothing to do with HTML-encoding. It's more like URL-encoding, but it's not even properly that. It's a bizarre non-standard encoding available only in JavaScript.

If you want an HTML encoder, you'll have to write it yourself as JavaScript doesn't give you one. For example:

function encodeHTML(s) {
    return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/"/g, '&quot;');
}

However whilst this is enough to put your user_id in places like the input value, it's not enough for id because IDs can only use a limited selection of characters. (And % isn't among them, so escape() or even encodeURIComponent() is no good.)

You could invent your own encoding scheme to put any characters in an ID, for example:

function encodeID(s) {
    if (s==='') return '_';
    return s.replace(/[^a-zA-Z0-9.-]/g, function(match) {
        return '_'+match[0].charCodeAt(0).toString(16)+'_';
    });
}

But you've still got a problem if the same user_id occurs twice. And to be honest, the whole thing with throwing around HTML strings is usually a bad idea. Use DOM methods instead, and retain JavaScript references to each element, so you don't have to keep calling getElementById, or worrying about how arbitrary strings are inserted into IDs.

eg.:

function addChut(user_id) {
    var log= document.createElement('div');
    log.className= 'log';
    var textarea= document.createElement('textarea');
    var input= document.createElement('input');
    input.value= user_id;
    input.readonly= True;
    var button= document.createElement('input');
    button.type= 'button';
    button.value= 'Message';

    var chut= document.createElement('div');
    chut.className= 'chut';
    chut.appendChild(log);
    chut.appendChild(textarea);
    chut.appendChild(input);
    chut.appendChild(button);
    document.getElementById('chuts').appendChild(chut);

    button.onclick= function() {
        alert('Send '+textarea.value+' to '+user_id);
    };

    return chut;
}

You could also use a convenience function or JS framework to cut down on the lengthiness of the create-set-appends calls there.

ETA:

I'm using jQuery at the moment as a framework

OK, then consider the jQuery 1.4 creation shortcuts, eg.:

var log= $('<div>', {className: 'log'});
var input= $('<input>', {readOnly: true, val: user_id});
...

The problem I have right now is that I use JSONP to add elements and events to a page, and so I can not know whether the elements already exist or not before showing a message.

You can keep a lookup of user_id to element nodes (or wrapper objects) in JavaScript, to save putting that information in the DOM itself, where the characters that can go in an id are restricted.

var chut_lookup= {};
...

function getChut(user_id) {
    var key= '_map_'+user_id;
    if (key in chut_lookup)
        return chut_lookup[key];
    return chut_lookup[key]= addChut(user_id);
}

(The _map_ prefix is because JavaScript objects don't quite work as a mapping of arbitrary strings. The empty string and, in IE, some Object member names, confuse it.)

How to make script execution wait until jquery is loaded

the easiest and safest way is to use something like this:

var waitForJQuery = setInterval(function () {
    if (typeof $ != 'undefined') {

        // place your code here.

        clearInterval(waitForJQuery);
    }
}, 10);

Java 8 method references: provide a Supplier capable of supplying a parameterized result

optionalUsers.orElseThrow(() -> new UsernameNotFoundException("Username not found"));

Programs & Examples On #Leader

Leader Not Available Kafka in Console Producer

javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25

How can I show the table structure in SQL Server query?

Removing "bullets" from unordered list <ul>

How to make a 3-level collapsing menu in Bootstrap?

Parsing JSON objects for HTML table

Using SELECT result in another SELECT

Use getElementById on HTMLElement instead of HTMLDocument

Display Images Inline via CSS

How to Set Selected value in Multi-Value Select in Jquery-Select2.?

Get Selected value from Multi-Value Select Boxes by jquery-select2?

Returns the selected data in structure of object:

Returns the selected val:

To compare two elements(string type) in XSLT?

Trigger back-button functionality on button click in Android

org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1

What is the purpose of the : (colon) GNU Bash builtin?

Self-documenting functions

Git Commit Messages: 50/72 Formatting

What is the <leader> in a .vimrc file?

What is the best or most commonly used JMX Console / Client

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

What's causing my java.net.SocketException: Connection reset?

Top 5 Mobile App Development Companies In the UK 2024

Simple Pivot Table to Count Unique Values

Exception in thread "main" java.lang.Error: Unresolved compilation problems

vba pass a group of cells as range to function

Cannot implicitly convert type 'int?' to 'int'.

Submitting a multidimensional array via POST with php

Box-Shadow on the left side of the element only

How can I calculate an md5 checksum of a directory?

How to log cron jobs?

How do you get centered content using Twitter Bootstrap?

Create Test Class in IntelliJ

How to programmatically send SMS on the iPhone?

How to use an arraylist as a prepared statement parameter

if arguments is equal to this string, define a variable like this string

How do HashTables deal with collisions?

"multiple target patterns" Makefile error

How does HttpContext.Current.User.Identity.Name know which usernames exist?

android ellipsize multiline textview

Swipe to Delete and the "More" button (like in Mail app on iOS 7)

How can I get the latest JRE / JDK as a zip file rather than EXE or MSI installer?

How can I use a carriage return in a HTML tooltip?

"401 Unauthorized" on a directory

How do I pass a variable to the layout using Laravel' Blade templating?

Escape string for use in Javascript regex

Short 'n Sweet

Test Case: A typical url

The Long Answer

Request Monitoring in Chrome

How do I set up HttpContent for my HttpClient PostAsync second parameter?

How can I serve static html from spring boot?

"The breakpoint will not currently be hit. The source code is different from the original version." What does this mean?

Java getting the Enum name given the Enum Value

How to implement debounce in Vue2?

Iterate over object attributes in python

How do I delete an exported environment variable?

tooltips for Button

Proxy with urllib2

How can I generate a unique ID in Python?

Selenium IDE - Command to wait for 5 seconds

Run / Open VSCode from Mac Terminal

FB OpenGraph og:image not pulling images (possibly https?)

Where are static methods and static variables stored in Java?

How to send password securely over HTTP?

How do I find out my root MySQL password?

Tab key == 4 spaces and auto-indent after curly braces in Vim

Javascript/DOM: How to remove all events of a DOM object?

Converting array to list in Java

reading text file with utf-8 encoding using java

How to recursively delete an entire directory with PowerShell 2.0?

Convert output of MySQL query to utf8

Formatting a Date String in React Native

Set the maximum character length of a UITextField

WHERE vs HAVING

How to log in to phpMyAdmin with WAMP, what is the username and password?

Jackson enum Serializing and DeSerializer

long long int vs. long int vs. int64_t in C++

HTML5 `download` attribute

`branch`: add a `--copy` (`-c`) option to go with `--move` (`-m`)