#Jspx | Programs & Examples on Jspx

Neither BindingResult nor plain target object for bean name available as request attribute

I had problem like this, but with several "actions". My solution looks like this:

    <form method="POST" th:object="${searchRequest}" action="searchRequest" >
          <input type="text" th:field="*{name}"/>
          <input type="submit" value="find" th:value="find" />
    </form>
        ...
    <form method="POST" th:object="${commodity}" >
        <input type="text" th:field="*{description}"/>
        <input type="submit" value="add" />
    </form>

And controller

@Controller
@RequestMapping("/goods")
public class GoodsController {
    @RequestMapping(value = "add", method = GET)
    public String showGoodsForm(Model model){
           model.addAttribute(new Commodity());
           model.addAttribute("searchRequest", new SearchRequest());
           return "goodsForm";
    }
    @RequestMapping(value = "add", method = POST)
    public ModelAndView processAddCommodities(
            @Valid Commodity commodity,
            Errors errors) {
        if (errors.hasErrors()) {
            ModelAndView model = new ModelAndView("goodsForm");
            model.addObject("searchRequest", new SearchRequest());
            return model;
        }
        ModelAndView model = new ModelAndView("redirect:/goods/" + commodity.getName());
        model.addObject(new Commodity());
        model.addObject("searchRequest", new SearchRequest());
        return model;
    }
    @RequestMapping(value="searchRequest", method=POST)
    public String processFindCommodity(SearchRequest commodity, Model model) {
    ...
        return "catalog";
    }

I'm sure - here is not "best practice", but it is works without "Neither BindingResult nor plain target object for bean name available as request attribute".

javax.el.PropertyNotFoundException: Property 'foo' not found on type com.example.Bean

I was facing the similar type of issue: Code Snippet :

<c:forEach items="${orderList}" var="xx"> ${xx.id} <br> </c:forEach>

There was a space after orderlist like this : "${orderList} " because of which the xx variable was getting coverted into String and was not able to call xx.id.

So make sure about space. They play crucial role sometimes. :p

How to access cookies in AngularJS?

This is how you can set and get cookie values. This is what I was originally looking for when I found this question.

Note we use $cookieStore instead of $cookies

<!DOCTYPE html>
<html ng-app="myApp">
<head>
  <script src="http://code.angularjs.org/1.0.0rc10/angular-1.0.0rc10.js"></script>
  <script src="http://code.angularjs.org/1.0.0rc10/angular-cookies-1.0.0rc10.js"></script>
  <script>
    angular.module('myApp', ['ngCookies']);
    function CookieCtrl($scope, $cookieStore) {
      $scope.lastVal = $cookieStore.get('tab');

      $scope.changeTab = function(tabName){
          $scope.lastVal = tabName;
          $cookieStore.put('tab', tabName);
      };
    }
  </script>
</head>
<body ng-controller="CookieCtrl">
    <!-- ... -->
</body>
</html>

window.open with headers

Can I control the HTTP headers sent by window.open (cross browser)?

If not, can I somehow window.open a page that then issues my request with custom headers inside its popped-up window?

You can request a URL that triggers a server side program which makes the request with arbitrary headers and then returns the response
You can run JavaScript (probably saying goodbye to Progressive Enhancement) that uses XHR to make the request with arbitrary headers (assuming the URL fits within the Same Origin Policy) and then process the result in JS.

I need some cunning hacks...

It might help if you described the problem instead of asking if possible solutions would work.

How do I perform query filtering in django templates

The other option is that if you have a filter that you always want applied, to add a custom manager on the model in question which always applies the filter to the results returned.

A good example of this is a Event model, where for 90% of the queries you do on the model you are going to want something like Event.objects.filter(date__gte=now), i.e. you're normally interested in Events that are upcoming. This would look like:

class EventManager(models.Manager):
    def get_query_set(self):
        now = datetime.now()
        return super(EventManager,self).get_query_set().filter(date__gte=now)

And in the model:

class Event(models.Model):
    ...
    objects = EventManager()

But again, this applies the same filter against all default queries done on the Event model and so isn't as flexible some of the techniques described above.

How to drop all stored procedures at once in SQL Server database?

ANSI compliant, without cursor

DECLARE @SQL national character varying(MAX) 
SET @SQL= ''

SELECT @SQL= @SQL+ N'DROP PROCEDURE "' + REPLACE(SPECIFIC_SCHEMA, N'"', N'""') + N'"."' + REPLACE(SPECIFIC_NAME, N'"', N'""') + N'"; '
FROM INFORMATION_SCHEMA.ROUTINES 

WHERE (1=1) 
AND ROUTINE_TYPE = 'PROCEDURE' 
AND ROUTINE_NAME NOT IN 
(
     'dt_adduserobject'
    ,'dt_droppropertiesbyid'
    ,'dt_dropuserobjectbyid'
    ,'dt_generateansiname'
    ,'dt_getobjwithprop'
    ,'dt_getobjwithprop_u'
    ,'dt_getpropertiesbyid'
    ,'dt_getpropertiesbyid_u'
    ,'dt_setpropertybyid'
    ,'dt_setpropertybyid_u'
    ,'dt_verstamp006'
    ,'dt_verstamp007'

    ,'sp_helpdiagrams'
    ,'sp_creatediagram'
    ,'sp_alterdiagram'
    ,'sp_renamediagram'
    ,'sp_dropdiagram'

    ,'sp_helpdiagramdefinition'
    ,'fn_diagramobjects'
    ,'sp_upgraddiagrams'
) 


ORDER BY SPECIFIC_NAME 


-- PRINT @SQL
EXEC(@SQL)

Without cursor, non-ansi compliant:

DECLARE @sql NVARCHAR(MAX) = N''
, @lineFeed NVARCHAR(2) = CHAR(13) + CHAR(10) ;

SELECT @sql = @sql + N'DROP PROCEDURE ' + QUOTENAME(SPECIFIC_SCHEMA) + N'.' + QUOTENAME(SPECIFIC_NAME) + N';' + @lineFeed
FROM INFORMATION_SCHEMA.ROUTINES 
WHERE ROUTINE_TYPE = 'PROCEDURE' 
-- AND SPECIFIC_NAME LIKE 'sp[_]RPT[_]%'


AND ROUTINE_NAME NOT IN 
( 
    SELECT name FROM sys.procedures WHERE is_ms_shipped <> 0 
) 


ORDER BY SPECIFIC_NAME 


-- PRINT @sql 
EXECUTE(@sql)

Understanding implicit in Scala

WARNING: contains sarcasm judiciously! YMMV...

Luigi's answer is complete and correct. This one is only to extend it a bit with an example of how you can gloriously overuse implicits, as it happens quite often in Scala projects. Actually so often, you can probably even find it in one of the "Best Practice" guides.

object HelloWorld {
  case class Text(content: String)
  case class Prefix(text: String)

  implicit def String2Text(content: String)(implicit prefix: Prefix) = {
    Text(prefix.text + " " + content)
  }

  def printText(text: Text): Unit = {
    println(text.content)
  }

  def main(args: Array[String]): Unit = {
    printText("World!")
  }

  // Best to hide this line somewhere below a pile of completely unrelated code.
  // Better yet, import its package from another distant place.
  implicit val prefixLOL = Prefix("Hello")
}

How to resolve compiler warning 'implicit declaration of function memset'

Try to add next define at start of your .c file:

#define _GNU_SOURCE

It helped me with pipe2 function.

Clear text field value in JQuery

If you are using jQuery, then you can use this:

// var doc_val_check = $('#doc_title').val(); - No need of this!
if ($('#doc_title').val().length > 0) {
    $('#doc_title').val("");
}

java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0

I encountered the same issue, when jdk 1.7 was used to compile then jre 1.4 was used for execution.

My solution was to set environment variable PATH by adding pathname C:\glassfish3\jdk7\bin in front of the existing PATH setting. The updated value is "C:\glassfish3\jdk7\bin;C:\Sun\SDK\bin". After the update, the problem was gone.

How to get the url parameters using AngularJS

When using angularjs with express

On my example I was using angularjs with express doing the routing so using $routeParams would mess up with my routing. I used the following code to get what I was expecting:

const getParameters = (temp, path) => {
  const parameters = {};
  const tempParts = temp.split('/');
  const pathParts = path.split('/');
  for (let i = 0; i < tempParts.length; i++) {
    const element = tempParts[i];
    if(element.startsWith(':')) {
      const key = element.substring(1,element.length);
      parameters[key] = pathParts[i];
    }
  }
  return parameters;
};

This receives a URL template and the path of the given location. The I just call it with:

const params = getParameters('/:table/:id/visit/:place_id/on/:interval/something', $location.path());

Putting it all together my controller is:

.controller('TestController', ['$scope', function($scope, $window) {
  const getParameters = (temp, path) => {
    const parameters = {};
    const tempParts = temp.split('/');
    const pathParts = path.split('/');
    for (let i = 0; i < tempParts.length; i++) {
      const element = tempParts[i];
      if(element.startsWith(':')) {
        const key = element.substring(1,element.length);
        parameters[key] = pathParts[i];
      }
    }
    return parameters;
  };

const params = getParameters('/:table/:id/visit/:place_id/on/:interval/something', $window.location.pathname);
}]);

The result will be:

{ table: "users", id: "1", place_id: "43", interval: "week" }

Hope this helps someone out there!

Setting up MySQL and importing dump within Dockerfile

edit: I had misunderstand the question here. My following answer explains how to run sql commands at container creation time, but not at image creation time as desired by OP.

I'm not quite fond of Kuhess's accepted answer as the sleep 5 seems a bit hackish to me as it assumes that the mysql db daemon has correctly loaded within this time frame. That's an assumption, no guarantee. Also if you use a provided mysql docker image, the image itself already takes care about starting up the server; I would not interfer with this with a custom /usr/bin/mysqld_safe.

I followed the other answers around here and copied bash and sql scripts into the folder /docker-entrypoint-initdb.d/ within the docker container as this is clearly the intended way by the mysql image provider. Everything in this folder is executed once the db daemon is ready, hence you should be able rely on it.

As an addition to the others - since no other answer explicitely mentions this: besides sql scripts you can also copy bash scripts into that folder which might give you more control.

This is what I had needed for example as I also needed to import a dump, but the dump alone was not sufficient as it did not provide which database it should import into. So in my case I have a script named db_custom_init.sh with this content:

mysql -u root -p$MYSQL_ROOT_PASSWORD -e 'create database my_database_to_import_into'
mysql -u root -p$MYSQL_ROOT_PASSWORD my_database_to_import_into < /home/db_dump.sql

and this Dockerfile copying that script:

FROM mysql/mysql-server:5.5.62
ENV MYSQL_ROOT_PASSWORD=XXXXX
COPY ./db_dump.sql /home/db_dump.sql
COPY ./db_custom_init.sh /docker-entrypoint-initdb.d/

How to lock orientation of one view controller to portrait mode only in Swift

Add this code to force portrait and lock it:

override func viewDidLoad() {
    super.viewDidLoad()

    // Force the device in portrait mode when the view controller gets loaded
    UIDevice.currentDevice().setValue(UIInterfaceOrientation.Portrait.rawValue, forKey: "orientation") 
}

override func shouldAutorotate() -> Bool {
    // Lock autorotate
    return false
}

override func supportedInterfaceOrientations() -> Int {

    // Only allow Portrait
    return Int(UIInterfaceOrientationMask.Portrait.rawValue)
}

override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {

    // Only allow Portrait
    return UIInterfaceOrientation.Portrait
}

In your AppDelegate - set supportedInterfaceOrientationsForWindow to whatever orientations you want the entire application to support:

func application(application: UIApplication, supportedInterfaceOrientationsForWindow window: UIWindow?) -> UIInterfaceOrientationMask {
    return UIInterfaceOrientationMask.All
}

Getting 404 Not Found error while trying to use ErrorDocument

The ErrorDocument directive, when supplied a local URL path, expects the path to be fully qualified from the DocumentRoot. In your case, this means that the actual path to the ErrorDocument is

ErrorDocument 404 /hellothere/error/404page.html

How to change language of app when user selects language?

all the above @Uday's code is perfect but only one thing is missing(default config in build.gradle)

public void setLocale(String lang) { 
Locale myLocale = new Locale(lang); 
Resources res = getResources(); 
DisplayMetrics dm = res.getDisplayMetrics(); 
Configuration conf = res.getConfiguration(); 
conf.locale = myLocale; 
res.updateConfiguration(conf, dm); 
Intent refresh = new Intent(this, AndroidLocalize.class); 
finish();
startActivity(refresh);

}

Mine was not working just because the languages were not mentioned in the config file(build.gradle)

 defaultConfig {
    resConfigs "en", "hi", "kn"
}

after that, all languages started running

How to block calls in android

It is possible and you don't need to code it on your own.

Just set the ringer volume to zero and vibration to none if incomingNumber equals an empty string. Thats it ...

Its just done for you with the application Nostalk from Android Market. Just give it a try ...

default value for struct member in C

you can not do it in this way

Use the following instead

typedef struct
{
   int id;
   char* name;
}employee;

employee emp = {
.id = 0, 
.name = "none"
};

You can use macro to define and initialize your instances. this will make easiier to you each time you want to define new instance and initialize it.

typedef struct
{
   int id;
   char* name;
}employee;

#define INIT_EMPLOYEE(X) employee X = {.id = 0, .name ="none"}

and in your code when you need to define new instance with employee type, you just call this macro like:

INIT_EMPLOYEE(emp);

PHP file_get_contents() and setting request headers

If you don't need HTTPS and curl is not available on your system you could use fsockopen

This function opens a connection from which you can both read and write like you would do with a normal file handle.

PHP + curl, HTTP POST sample code?

Procedural

// set post fields
$post = [
    'username' => 'user1',
    'password' => 'passuser1',
    'gender'   => 1,
];

$ch = curl_init('http://www.example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

// execute!
$response = curl_exec($ch);

// close the connection, release resources used
curl_close($ch);

// do anything you want with your response
var_dump($response);

Object oriented

<?php

// mutatis mutandis
namespace MyApp\Http;

class CurlPost
{
    private $url;
    private $options;
           
    /**
     * @param string $url     Request URL
     * @param array  $options cURL options
     */
    public function __construct($url, array $options = [])
    {
        $this->url = $url;
        $this->options = $options;
    }

    /**
     * Get the response
     * @return string
     * @throws \RuntimeException On cURL error
     */
    public function __invoke(array $post)
    {
        $ch = \curl_init($this->url);
        
        foreach ($this->options as $key => $val) {
            \curl_setopt($ch, $key, $val);
        }

        \curl_setopt($ch, \CURLOPT_RETURNTRANSFER, true);
        \curl_setopt($ch, \CURLOPT_POSTFIELDS, $post);

        $response = \curl_exec($ch);
        $error    = \curl_error($ch);
        $errno    = \curl_errno($ch);
        
        if (\is_resource($ch)) {
            \curl_close($ch);
        }

        if (0 !== $errno) {
            throw new \RuntimeException($error, $errno);
        }
        
        return $response;
    }
}

Usage

// create curl object
$curl = new \MyApp\Http\CurlPost('http://www.example.com');

try {
    // execute the request
    echo $curl([
        'username' => 'user1',
        'password' => 'passuser1',
        'gender'   => 1,
    ]);
} catch (\RuntimeException $ex) {
    // catch errors
    die(sprintf('Http error %s with code %d', $ex->getMessage(), $ex->getCode()));
}

Side note here: it would be best to create some kind of interface called AdapterInterface for example with getResponse() method and let the class above implement it. Then you can always swap this implementation with another adapter of your like, without any side effects to your application.

Using HTTPS / encrypting traffic

Usually there's a problem with cURL in PHP under the Windows operating system. While trying to connect to a https protected endpoint, you will get an error telling you that certificate verify failed.

What most people do here is to tell the cURL library to simply ignore certificate errors and continue (curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);). As this will make your code work, you introduce huge security hole and enable malicious users to perform various attacks on your app like Man In The Middle attack or such.

Never, ever do that. Instead, you simply need to modify your php.ini and tell PHP where your CA Certificate file is to let it verify certificates correctly:

; modify the absolute path to the cacert.pem file
curl.cainfo=c:\php\cacert.pem

The latest cacert.pem can be downloaded from the Internet or extracted from your favorite browser. When changing any php.ini related settings remember to restart your webserver.

Convert Rows to columns using 'Pivot' in SQL Server

This is for dynamic # of weeks.

Full example here:SQL Dynamic Pivot

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)

--Get distinct values of the PIVOT Column 
SELECT @ColumnName= ISNULL(@ColumnName + ',','') + QUOTENAME(Week)
FROM (SELECT DISTINCT Week FROM #StoreSales) AS Weeks

--Prepare the PIVOT query using the dynamic 
SET @DynamicPivotQuery = 
  N'SELECT Store, ' + @ColumnName + ' 
    FROM #StoreSales
    PIVOT(SUM(xCount) 
          FOR Week IN (' + @ColumnName + ')) AS PVTTable'
--Execute the Dynamic Pivot Query
EXEC sp_executesql @DynamicPivotQuery

Get the value in an input text box

For those who just like me are newbies in JS and getting undefined instead of text value make sure that your id doesn't contain invalid characters.

MySQL direct INSERT INTO with WHERE clause

The INSERT INTO Statement
The INSERT INTO statement is used to insert a new row in a table.
SQL INSERT INTO Syntax

It is possible to write the INSERT INTO statement in two forms.

The first form doesn't specify the column names where the data will be inserted, only their values:

INSERT INTO table_name
VALUES (value1, value2, value3,...)

The second form specifies both the column names and the values to be inserted:

INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)

How to make a select with array contains value clause in psql

Try

SELECT * FROM table WHERE arr @> ARRAY['s']::varchar[]

json.dumps vs flask.jsonify

The choice of one or another depends on what you intend to do. From what I do understand:

jsonify would be useful when you are building an API someone would query and expect json in return. E.g: The REST github API could use this method to answer your request.
dumps, is more about formating data/python object into json and work on it inside your application. For instance, I need to pass an object to my representation layer where some javascript will display graph. You'll feed javascript with the Json generated by dumps.

Creating a div element in jQuery

If it is just an empty div, this is sufficient:

$("#foo").append("<div>")

$("#foo").append("<div/>")

It gives the same result.

How to write to file in Ruby?

To destroy the previous contents of the file, then write a new string to the file:

open('myfile.txt', 'w') { |f| f << "some text or data structures..." }

To append to a file without overwriting its old contents:

open('myfile.txt', "a") { |f| f << 'I am appended string' }

Use awk to find average of a column

awk 's+=$2{print s/NR}' table | tail -1

I am using tail -1 to print the last line which should have the average number...

Sqlite or MySql? How to decide?

My few cents to previous excellent replies. the site www.sqlite.org works on a sqlite database. Here is the link when the author (Richard Hipp) replies to a similar question.

Convert to Datetime MM/dd/yyyy HH:mm:ss in Sql Server

Declare @month as char(2)
Declare @date as char(2)
Declare @year as char(4)
declare @time as char(8)
declare @customdate as varchar(20)

set @month = MONTH(GetDate());
set @date = Day(GetDate());
set @year = year(GetDate());

set @customdate= @month+'/'+@date+'/'+@year+' '+ CONVERT(varchar(8), GETDATE(),108);
print(@customdate)

ImportError: No module named win32com.client

Try to install the "pywin32" file, you can find in https://github.com/mhammond/pywin32/releases

Install the version that you use in your IDLE, and try to install, after you can open your project and compile another turn!

thanks !

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

For SQL Server:

ALTER TABLE TableName
    DROP COLUMN Column1, Column2;

The syntax is

DROP { [ CONSTRAINT ] constraint_name | COLUMN column } [ ,...n ]

For MySQL:

ALTER TABLE TableName
    DROP COLUMN Column1,
    DROP COLUMN Column2;

or like this¹:

ALTER TABLE TableName
    DROP Column1,
    DROP Column2;

¹ The word COLUMN is optional and can be omitted, except for RENAME COLUMN (to distinguish a column-renaming operation from the RENAME table-renaming operation). More info here.

A simple command line to download a remote maven2 artifact to the local repository?

Since version 2.1 of the Maven Dependency Plugin, there is a dependency:get goal for this purpose. To make sure you are using the right version of the plugin, you'll need to use the "fully qualified name":

mvn org.apache.maven.plugins:maven-dependency-plugin:2.1:get \
    -DrepoUrl=http://download.java.net/maven/2/ \
    -Dartifact=robo-guice:robo-guice:0.4-SNAPSHOT

Keep only first n characters in a string?

You could try:

myString.substring(0, 8);

Get yesterday's date using Date

There is no direct function to get yesterday's date.

To get yesterday's date, you need to use Calendar by subtracting -1.

Base64 Encoding Image

My synopsis of rfc2397 is:

Once you've got your base64 encoded image data put it inside the <Image></Image> tags prefixed with "data:{mimetype};base64," this is similar to the prefixing done in the parenthesis of url() definition in CSS or in the quoted value of the src attribute of the img tag in [X]HTML. You can test the data url in firefox by putting the data:image/... line into the URL field and pressing enter, it should show your image.

For actually encoding I think we need to go over all your options, not just PHP, because there's so many ways to base64 encode something.

Use the base64 command line tool. It's part of the GNU coreutils (v6+) and pretty much default in any Cygwin, L i n u x, GnuWin32 install, but not the BSDs I tried. Issue: $ base64 imagefile.ico > imagefile.base64.txt
Use a tool that features the option to convert to base64, like Notepad++ which has the feature under plugins->MIME tools->base64 Encode
Email yourself the file and view the raw email contents, copy and paste.
Use a web form.

A note on mime-types: I would prefer you use one of image/png image/jpeg or image/gif as I can't find the popular image/x-icon. Should that be image/vnd.microsoft.icon? Also the other formats are much shorter.

compare 265 bytes vs 1150 bytes:

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAMAAAAoLQ9TAAAAVFBMVEWcZjTcViTMuqT8/vzcYjTkhhTkljT87tz03sRkZmS8mnT03tT89vTsvoTk1sz86uTkekzkjmzkwpT01rTsmnzsplTUwqz89uy0jmzsrmTknkT0zqT3X4fRAAAAbklEQVR4XnXOVw6FIBBAUafQsZfX9r/PB8JoTPT+QE4o01AtMoS8HkALcH8BGmGIAvaXLw0wCqxKz0Q9w1LBfFSiJBzljVerlbYhlBO4dZHM/F3llybncbIC6N+70Q7OlUm7DdO+gKs9gyRwdgd/LOcGXHzLN5gAAAAASUVORK5CYII=

data:image/x-icon;base64,AAABAAEAEBAAAAEAIABoBAAAFgAAACgAAAAQAAAAIAAAAAEAIAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAD/////ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv///////////2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb///////////9mZmb/ZmZm//////////////////////////////////////////////////////9mZmb/ZmZm////////////ZmZm/2ZmZv//////ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv//////ZmZm/2ZmZv///////////2ZmZv9mZmb//////2ZmZv9mZmb/ZmZm/2ZmZv9mZmb/ZmZm/2ZmZv9mZmb//////2ZmZv9mZmb///////////9mZmb/ZmZm////////////////////////////8fX4/8nW5P+twtb/oLjP//////9mZmb/ZmZm////////////////////////////oLjP/3eZu/9pj7T/M2aZ/zNmmf8zZpn/M2aZ/zNmmf///////////////////////////////////////////zNmmf8zZpn/M2aZ/zNmmf8zZpn/d5m7/6C4z/+WwuH/wN/3//////////////////////////////////////+guM//rcLW/8nW5P/x9fj//////9/v+/+w1/X/QZ7m/1Cm6P//////////////////////////////////////////////////////7/f9/4C+7v8xluT/EYbg/zGW5P/A3/f/0933/9Pd9//////////////////////////////////f7/v/YK7q/xGG4P8RhuD/MZbk/7DX9f//////4uj6/zJh2/8yYdv/8PT8////////////////////////////UKbo/xGG4P8xluT/sNf1////////////4uj6/zJh2/8jVtj/e5ro/////////////////////////////////8Df9/+gz/P/////////////////8PT8/0944P8jVtj/bI7l/////////////////////////////////////////////////////////////////2yO5f8jVtj/T3jg//D0/P///////////////////////////////////////////////////////////3ua6P8jVtj/MmHb/+Lo+v////////////////////////////////////////////////////////////D0/P8yYdv/I1bY/9Pd9///////////////////////AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==

How to make a dropdown readonly using jquery?

Maybe you can try this way

function myFunction()
{
   $("select[id^=myID]").attr("disabled", true);
   var txtSelect = $("select[id^=myID] option[selected]").text();
}

This sets the first value of the drop-down as the default and it seems readonly

How to access Spring MVC model object in javascript file?

JavaScript is run on the client side. Your model does not exist on the client side, it only exists on the server side while you are rendering your .jsp.

If you want data from the model to be available to client side code (ie. javascript), you will need to store it somewhere in the rendered page. For example, you can use your Jsp to write JavaScript assigning your model to JavaScript variables.

Update:

A simple example

<%-- SomeJsp.jsp --%>
<script>var paramOne =<c:out value="${paramOne}"/></script>

ab load testing

Steps to set up Apache Bench(AB) on windows (IMO - Recommended).

Step 1 - Install Xampp.
Step 2 - Open CMD.
Step 3 - Go to the apache bench destination (cd C:\xampp\apache\bin) from CMD
Step 4 - Paste the command (ab -n 100 -c 10 -k -H "Accept-Encoding: gzip, deflate" http://localhost:yourport/)
Step 5 - Wait for it. Your done

Represent space and tab in XML tag

I think you could use an actual space or tab directly in XML document, but if you are looking for special characters to represent them so that text processors can't mess them up, then it's:

space = &#032;
tab   = &#009;

Linq to Sql: Multiple left outer joins

I think you should be able to follow the method used in this post. It looks really ugly, but I would think you could do it twice and get the result you want.

I wonder if this is actually a case where you'd be better off using DataContext.ExecuteCommand(...) instead of converting to linq.

Print the stack trace of an exception

There is an alternate form of Throwable.printStackTrace() that takes a print stream as an argument. http://download.oracle.com/javase/6/docs/api/java/lang/Throwable.html#printStackTrace(java.io.PrintStream)

E.g.

catch(Exception e) {
    e.printStackTrace(System.out);
}

This will print the stack trace to std out instead of std error.

Git - Pushing code to two remotes

To send to both remote with one command, you can create a alias for it:

git config alias.pushall '!git push origin devel && git push github devel'

With this, when you use the command git pushall, it will update both repositories.

Making a Bootstrap table column fit to content

You can wrap your table around the div tag like this as it helped me too.

<div class="col-md-3">

<table>
</table>

</div>

Titlecase all entries into a form_for text field

You don't want to take care of normalizing your data in a view - what if the user changes the data that gets submitted? Instead you could take care of it in the model using the before_save (or the before_validation) callback. Here's an example of the relevant code for a model like yours:

class Place < ActiveRecord::Base   before_save do |place|     place.city = place.city.downcase.titleize     place.country = place.country.downcase.titleize   end end

You can also check out the Ruby on Rails guide for more info.

To answer you question more directly, something like this would work:

<%= f.text_field :city, :value => (f.object.city ? f.object.city.titlecase : '') %>

This just means if f.object.city exists, display the titlecase version of it, and if it doesn't display a blank string.

Eclipse - Failed to load class "org.slf4j.impl.StaticLoggerBinder"

After placing the jar file in desired location, you need to add the jar file by right click on

Project --> properties --> Java Build Path --> Libraries --> Add Jar.

What's the difference between a method and a function?

for me: the function of a method and a function is the same if I agree that:

a function may return a value
may expect parameters

Just like any piece of code you may have objects you put in and you may have an object that comes as a result. During doing that they might change the state of an object but that would not change their basic functioning for me.

There might be a definition differencing in calling functions of objects or other codes. But isn't that something for a verbal differenciations and that's why people interchange them? The mentions example of computation I would be careful with. because I hire employes to do my calculations:

new Employer().calculateSum( 8, 8 );

By doing it that way I can rely on an employer being responsible for calculations. If he wants more money I free him and let the carbage collector's function of disposing unused employees do the rest and get a new employee.

Even arguing that a method is an objects function and a function is unconnected computation will not help me. The function descriptor itself and ideally the function's documentation will tell me what it needs and what it may return. The rest, like manipulating some object's state is not really transparent to me. I do expect both functions and methods to deliver and manipulate what they claim to without needing to know in detail how they do it. Even a pure computational function might change the console's state or append to a logfile.

UnicodeEncodeError: 'ascii' codec can't encode character u'\xef' in position 0: ordinal not in range(128)

An easy solution to overcome this problem is to set your default encoding to utf8. Follow is an example

import sys

reload(sys)
sys.setdefaultencoding('utf8')

how to get current month and year

label1.Text = DateTime.Now.Month.ToString();

and

label2.Text = DateTime.Now.Year.ToString();

How do I stop a program when an exception is raised in Python?

You can stop catching the exception, or - if you need to catch it (to do some custom handling), you can re-raise:

try:
  doSomeEvilThing()
except Exception, e:
  handleException(e)
  raise

Note that typing raise without passing an exception object causes the original traceback to be preserved. Typically it is much better than raise e.

Of course - you can also explicitly call

import sys 
sys.exit(exitCodeYouFindAppropriate)

This causes SystemExit exception to be raised, and (unless you catch it somewhere) terminates your application with specified exit code.

Regular Expressions- Match Anything

Try this:

I bought (.* )?sheep

or even

I bought .*sheep

jQuery disable a link

I know this isn't with jQuery but you can disable a link with some simple css:

a[disabled] {
  z-index: -1;
}

the HTML would look like

<a disabled="disabled" href="/start">Take Survey</a>

Calling the base class constructor from the derived class constructor

The constructor of PetStore will call a constructor of Farm; there's no way you can prevent it. If you do nothing (as you've done), it will call the default constructor (Farm()); if you need to pass arguments, you'll have to specify the base class in the initializer list:

PetStore::PetStore()
    : Farm( neededArgument )
    , idF( 0 )
{
}

(Similarly, the constructor of PetStore will call the constructor of nameF. The constructor of a class always calls the constructors of all of its base classes and all of its members.)

jQuery post() with serialize and extra data

You can use this

var data = $("#myForm").serialize();
data += '&moreinfo='+JSON.stringify(wordlist);

Adding image to JFrame

As martijn-courteaux said, create a custom component it's the better option. In C# exists a component called PictureBox and I tried to create this component for Java, here is the code:

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;

public class JPictureBox extends JComponent {

    private Icon icon = null;
    private final Dimension dimension = new Dimension(100, 100);
    private Image image = null;
    private ImageIcon ii = null;
    private SizeMode sizeMode = SizeMode.STRETCH;
    private int newHeight, newWidth, originalHeight, originalWidth;

    public JPictureBox() {
        JPictureBox.this.setPreferredSize(dimension);
        JPictureBox.this.setOpaque(false);
        JPictureBox.this.setSizeMode(SizeMode.STRETCH);
    }

    @Override
    public void paintComponent(Graphics g) {
        if (ii != null) {
            switch (getSizeMode()) {
                case NORMAL:
                    g.drawImage(image, 0, 0, ii.getIconWidth(), ii.getIconHeight(), null);
                    break;
                case ZOOM:
                    aspectRatio();
                    g.drawImage(image, 0, 0, newWidth, newHeight, null);
                    break;
                case STRETCH:
                    g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), null);
                    break;
                case CENTER:
                    g.drawImage(image, (int) (this.getWidth() / 2) - (int) (ii.getIconWidth() / 2), (int) (this.getHeight() / 2) - (int) (ii.getIconHeight() / 2), ii.getIconWidth(), ii.getIconHeight(), null);
                    break;
                default:
                    g.drawImage(image, 0, 0, this.getWidth(), this.getHeight(), null);
            }
        }
    }

    public Icon getIcon() {
        return icon;
    }

    public void setIcon(Icon icon) {
        this.icon = icon;
        ii = (ImageIcon) icon;
        image = ii.getImage();
        originalHeight = ii.getIconHeight();
        originalWidth = ii.getIconWidth();
    }

    public SizeMode getSizeMode() {
        return sizeMode;
    }

    public void setSizeMode(SizeMode sizeMode) {
        this.sizeMode = sizeMode;
    }

    public enum SizeMode {
        NORMAL,
        STRETCH,
        CENTER,
        ZOOM
    }

    private void aspectRatio() {
        if (ii != null) {
            newHeight = this.getHeight();
            newWidth = (originalWidth * newHeight) / originalHeight;
        }
    }

}

If you want to add an image, choose the JPictureBox, after that go to Properties and find "icon" property and select an image. If you want to change the sizeMode property then choose the JPictureBox, after that go to Properties and find "sizeMode" property, you can choose some values:

NORMAL value, the image is positioned in the upper-left corner of the JPictureBox.
STRETCH value causes the image to stretch or shrink to fit the JPictureBox.
ZOOM value causes the image to be stretched or shrunk to fit the JPictureBox; however, the aspect ratio in the original is maintained.
CENTER value causes the image to be centered in the client area.

If you want to learn more about this topic, you can check this video.

Also you can see the code on Gitlab or Github.

Windows Batch Files: if else

An alternative would be to set a variable, and check whether it is defined:

SET ARG=%1
IF DEFINED ARG (echo "It is defined: %1") ELSE (echo "%%1 is not defined")

Unfortunately, using %1 directly with DEFINED doesn't work.

Python: can't assign to literal

You are trying to assign to literal integer values. 1, 2, etc. are not valid names; they are only valid integers:

>>> 1
1
>>> 1 = 'something'
  File "<stdin>", line 1
SyntaxError: can't assign to literal

You probably want to use a list or dictionary instead:

names = []
for i in range(1, 6):
    name = input("Please enter name {}:".format(i))
    names.append(name)

Using a list makes it much easier to pick a random value too:

winner = random.choice(names)
print('Well done {}. You are the winner!'.format(winner))

fs: how do I locate a parent folder?

i'm running electron app and i can get the parent folder by path.resolve()

parent 1 level:path.resolve(__dirname, '..') + '/'

parent 2 levels:path.resolve(__dirname, '..', '..') + '/'

What is the difference between <p> and <div>?

A p tag is for a paragraph, generally used for text. A div tag is for division, and generally used for creating sections of text.

How to get subarray from array?

For a simple use of slice, use my extension to Array Class:

Array.prototype.subarray = function(start, end) {
    if (!end) { end = -1; } 
    return this.slice(start, this.length + 1 - (end * -1));
};

Then:

var bigArr = ["a", "b", "c", "fd", "ze"];

Test1:

bigArr.subarray(1, -1);

< ["b", "c", "fd", "ze"]

Test2:

bigArr.subarray(2, -2);

< ["c", "fd"]

Test3:

bigArr.subarray(2);

< ["c", "fd","ze"]

Might be easier for developers coming from another language (i.e. Groovy).

jQuery function to open link in new window

Button click event only.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript"></script>
        <script language="javascript" type="text/javascript">
            $(document).ready(function () {
                $("#btnext").click(function () {                    
                    window.open("HTMLPage.htm", "PopupWindow", "width=600,height=600,scrollbars=yes,resizable=no");
                });
            });
</script>

How to verify a Text present in the loaded page through WebDriver

Note: Not in boolean

WebDriver driver=new FirefoxDriver();
driver.get("http://www.gmail.com");

if(driver.getPageSource().contains("Ur message"))
  {
    System.out.println("Pass");
  }
else
  {
    System.out.println("Fail");
  }

Finding the indices of matching elements in list in Python

if you're doing a lot of this kind of thing you should consider using numpy.

In [56]: import random, numpy

In [57]: lst = numpy.array([random.uniform(0, 5) for _ in range(1000)]) # example list

In [58]: a, b = 1, 3

In [59]: numpy.flatnonzero((lst > a) & (lst < b))[:10]
Out[59]: array([ 0, 12, 13, 15, 18, 19, 23, 24, 26, 29])

In response to Seanny123's question, I used this timing code:

import numpy, timeit, random

a, b = 1, 3

lst = numpy.array([random.uniform(0, 5) for _ in range(1000)])

def numpy_way():
    numpy.flatnonzero((lst > 1) & (lst < 3))[:10]

def list_comprehension():
    [e for e in lst if 1 < e < 3][:10]

print timeit.timeit(numpy_way)
print timeit.timeit(list_comprehension)

The numpy version is over 60 times faster.

In android how to set navigation drawer header image and name programmatically in class file?

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); navigationView.addHeaderView(yourview);

Print list without brackets in a single row

If the input array is Integer type then you need to first convert array into string type array and then use join method for joining with , or space whatever you want. e.g:

>>> arr = [1, 2, 4, 3]
>>> print(", " . join(arr))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected string, int found
>>> sarr = [str(a) for a in arr]
>>> print(", " . join(sarr))
1, 2, 4, 3
>>>

Direct using of join which will join the integer and string will throw error as show above.

Using an image caption in Markdown Jekyll

You can use table for this. It works fine.

| ![space-1.jpg](http://www.storywarren.com/wp-content/uploads/2016/09/space-1.jpg) | 
|:--:| 
| *Space* |

Result:

Passing arguments to JavaScript function from code-behind

Some other things I found out:

You can't directly pass in an array like:

this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "xx",   
"<script>test("+x+","+y+");</script>");

because that calls the ToString() methods of x and y, which returns "System.Int32[]", and obviously Javascript can't use that. I had to pass in the arrays as strings, like "[1,2,3,4,5]", so I wrote a helper method to do the conversion.

Also, there is a difference between this.Page.ClientScript.RegisterStartupScript() and this.Page.ClientScript.RegisterClientScriptBlock() - the former places the script at the bottom of the page, which I need in order to be able to access the controls (like with document.getElementByID). RegisterClientScriptBlock() is executed before the tags are rendered, so I actually get a Javascript error if I use that method.

http://www.wrox.com/WileyCDA/Section/Manipulating-ASP-NET-Pages-and-Server-Controls-with-JavaScript.id-310803.html covers the difference between the two pretty well.

Here's the complete example I came up with:

// code behind
protected void Button1_Click(object sender, EventArgs e)
{
    int[] x = new int[] { 1, 2, 3, 4, 5 };
    int[] y = new int[] { 1, 2, 3, 4, 5 };

    string xStr = getArrayString(x); // converts {1,2,3,4,5} to [1,2,3,4,5]
    string yStr = getArrayString(y);

    string script = String.Format("test({0},{1})", xStr, yStr);
    this.Page.ClientScript.RegisterStartupScript(this.GetType(),
    "testFunction", script, true);
    //this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(),
    //"testFunction", script, true); // different result
}
private string getArrayString(int[] array)
{
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < array.Length; i++)
    {
        sb.Append(array[i] + ",");
    }
    string arrayStr = string.Format("[{0}]", sb.ToString().TrimEnd(','));
    return arrayStr;
}

//aspx page
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
    function test(x, y)
    {
        var text1 = document.getElementById("text1")
        for(var i = 0; i<x.length; i++)
        {
            text1.innerText += x[i]; // prints 12345
        }
        text1.innerText += "\ny: " + y; // prints y: 1,2,3,4,5

    }

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Button"
         onclick="Button1_Click" />
    </div>
    <div id ="text1"> 
    </div>
    </form>
</body>
</html>

addEventListener in Internet Explorer

EDIT

I wrote a snippet that emulate the EventListener interface and the ie8 one, is callable even on plain objects: https://github.com/antcolag/iEventListener/blob/master/iEventListener.js

OLD ANSWER

this is a way for emulate addEventListener or attachEvent on browsers that don't support one of those
hope will help

(function (w,d) {  // 
    var
        nc  = "", nu    = "", nr    = "", t,
        a   = "addEventListener",
        n   = a in w,
        c   = (nc = "Event")+(n?(nc+= "", "Listener") : (nc+="Listener","") ),
        u   = n?(nu = "attach", "add"):(nu = "add","attach"),
        r   = n?(nr = "detach","remove"):(nr = "remove","detach")
/*
 * the evtf function, when invoked, return "attach" or "detach" "Event" functions if we are on a new browser, otherwise add "add" or "remove" "EventListener"
 */
    function evtf(whoe){return function(evnt,func,capt){return this[whoe]((n?((t = evnt.split("on"))[1] || t[0]) : ("on"+evnt)),func, (!n && capt? (whoe.indexOf("detach") < 0 ? this.setCapture() : this.removeCapture() ) : capt  ))}}
    w[nu + nc] = Element.prototype[nu + nc] = document[nu + nc] = evtf(u+c) // (add | attach)Event[Listener]
    w[nr + nc] = Element.prototype[nr + nc] = document[nr + nc] = evtf(r+c) // (remove | detach)Event[Listener]

})(window, document)

Use of *args and **kwargs

The names *args and **kwargs or **kw are purely by convention. It makes it easier for us to read each other's code

One place it is handy is when using the struct module

struct.unpack() returns a tuple whereas struct.pack() uses a variable number of arguments. When manipulating data it is convenient to be able to pass a tuple to struck.pack() eg.

tuple_of_data = struct.unpack(format_str, data)
... manipulate the data
new_data = struct.pack(format_str, *tuple_of_data)

without this ability you would be forced to write

new_data = struct.pack(format_str, tuple_of_data[0], tuple_of_data[1], tuple_of_data[2],...)

which also means the if the format_str changes and the size of the tuple changes, I'll have to go back and edit that really long line

How do I enable EF migrations for multiple contexts to separate databases?

EF 4.7 actually gives a hint when you run Enable-migrations at multiple context.

More than one context type was found in the assembly 'Service.Domain'.

To enable migrations for 'Service.Domain.DatabaseContext.Context1', 
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context1.
To enable migrations for 'Service.Domain.DatabaseContext.Context2',
use Enable-Migrations -ContextTypeName Service.Domain.DatabaseContext.Context2.

Most concise way to convert a Set<T> to a List<T>

not really sure what you're doing exactly via the context of your code but...

why make the listOfTopicAuthors variable at all?

List<String> list = Arrays.asList((....).toArray( new String[0] ) );

the "...." represents however your set came into play, whether it's new or came from another location.

How to have Ellipsis effect on Text

<View 
   style={{
        flexDirection: 'row',
        padding: 10,
    }}
>
  <Text numberOfLines={5} style={{flex:1}}>
       This is a very long text that will overflow on a small device This is a very 
       long text that will overflow on a small deviceThis is a very long text that 
       will overflow on a small deviceThis is a very long text that will overflow 
       on a small device
  </Text>
</View>

How to SELECT based on value of another SELECT

If you want to SELECT based on the value of another SELECT, then you probably want a "subselect":

http://beginner-sql-tutorial.com/sql-subquery.htm

For example, (from the link above):

You want the first and last names from table "student_details" ...

But you only want this information for those students in "science" class:

 SELECT id, first_name
 FROM student_details
 WHERE first_name IN (SELECT first_name
 FROM student_details
 WHERE subject= 'Science');

Frankly, I'm not sure this is what you're looking for or not ... but I hope it helps ... at least a little...

IMHO...

Maximum Length of Command Line String

From the Microsoft documentation: Command prompt (Cmd. exe) command-line string limitation

On computers running Microsoft Windows XP or later, the maximum length of the string that you can use at the command prompt is 8191 characters.

Add a row number to result set of a SQL query

The typical pattern would be as follows, but you need to actually define how the ordering should be applied (since a table is, by definition, an unordered bag of rows):

SELECT t.A, t.B, t.C, number = ROW_NUMBER() OVER (ORDER BY t.A)
  FROM dbo.tableZ AS t
  ORDER BY t.A;

Not sure what the variables in your question are supposed to represent (they don't match).

PHP - define constant inside a class

You can define a class constant in php. But your class constant would be accessible from any object instance as well. This is php's functionality. However, as of php7.1, you can define your class constants with access modifiers (public, private or protected).

A work around would be to define your constant as private or protected and then make them readable via a static function. This function should only return the constant values if called from the static context.

You can also create this static function in your parent class and simply inherit this parent class on all other classes to make it a default functionality.

Credits: http://dwellupper.io/post/48/defining-class-constants-in-php

auto increment ID in H2 database

Dictionary of dictionaries in Python?

dictionary's setdefault is a good way to update an existing dict entry if it's there, or create a new one if it's not all in one go:

Looping style:

# This is our sample data
data = [("Milter", "Miller", 4), ("Milter", "Miler", 4), ("Milter", "Malter", 2)]

# dictionary we want for the result
dictionary = {}

# loop that makes it work
for realName, falseName, position in data:
    dictionary.setdefault(realName, {})[falseName] = position

dictionary now equals:

{'Milter': {'Malter': 2, 'Miler': 4, 'Miller': 4}}

How to validate email id in angularJs using ng-pattern

Use below regular expression

^[_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+)+((\.)[a-z]{2,})+$

It allows

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

How to index characters in a Golang string?

Try this to get the charecters by their index

package main

import (
      "fmt"
      "strings"
)

func main() {
   str := strings.Split("HELLO","")
    fmt.Print(str[1])
}

Append text to input field

There are two options. Ayman's approach is the most simple, but I would add one extra note to it. You should really cache jQuery selections, there is no reason to call $("#input-field-id") twice:

var input = $( "#input-field-id" );
input.val( input.val() + "more text" );

The other option, .val() can also take a function as an argument. This has the advantange of easily working on multiple inputs:

$( "input" ).val( function( index, val ) {
    return val + "more text";
});

How to convert TimeStamp to Date in Java?

Just:

Timestamp timestamp = new Timestamp(long);
Date date = new Date(timestamp.getTime());

How to split elements of a list?

myList = [i.split('\t')[0] for i in myList]

R dplyr: Drop multiple columns

If you have a special character in the column names, either select or select_may not work as expected. This property of dplyr of using ".". To refer to the data set in the question, the following line can be used to solve this problem:

drop.cols <- c('Sepal.Length', 'Sepal.Width')
  iris %>% .[,setdiff(names(.),drop.cols)]

Google Maps API v3 marker with label

In order to add a label to the map you need to create a custom overlay. The sample at http://blog.mridey.com/2009/09/label-overlay-example-for-google-maps.html uses a custom class, Layer, that inherits from OverlayView (which inherits from MVCObject) from the Google Maps API. He has a revised version (adds support for visibility, zIndex and a click event) which can be found here: http://blog.mridey.com/2011/05/label-overlay-example-for-google-maps.html

The following code is taken directly from Marc Ridey's Blog (the revised link above).

Layer class

// Define the overlay, derived from google.maps.OverlayView
function Label(opt_options) {
  // Initialization
  this.setValues(opt_options);


  // Label specific
  var span = this.span_ = document.createElement('span');
  span.style.cssText = 'position: relative; left: -50%; top: -8px; ' +
  'white-space: nowrap; border: 1px solid blue; ' +
  'padding: 2px; background-color: white';


  var div = this.div_ = document.createElement('div');
  div.appendChild(span);
  div.style.cssText = 'position: absolute; display: none';
};
Label.prototype = new google.maps.OverlayView;


// Implement onAdd
Label.prototype.onAdd = function() {
  var pane = this.getPanes().overlayImage;
  pane.appendChild(this.div_);


  // Ensures the label is redrawn if the text or position is changed.
  var me = this;
  this.listeners_ = [
    google.maps.event.addListener(this, 'position_changed', function() { me.draw(); }),
    google.maps.event.addListener(this, 'visible_changed', function() { me.draw(); }),
    google.maps.event.addListener(this, 'clickable_changed', function() { me.draw(); }),
    google.maps.event.addListener(this, 'text_changed', function() { me.draw(); }),
    google.maps.event.addListener(this, 'zindex_changed', function() { me.draw(); }),
    google.maps.event.addDomListener(this.div_, 'click', function() {
      if (me.get('clickable')) {
        google.maps.event.trigger(me, 'click');
      }
    })
  ];
};

// Implement onRemove
Label.prototype.onRemove = function() {
 this.div_.parentNode.removeChild(this.div_);

 // Label is removed from the map, stop updating its position/text.
 for (var i = 0, I = this.listeners_.length; i < I; ++i) {
   google.maps.event.removeListener(this.listeners_[i]);
 }
};

// Implement draw
Label.prototype.draw = function() {
 var projection = this.getProjection();
 var position = projection.fromLatLngToDivPixel(this.get('position'));

 var div = this.div_;
 div.style.left = position.x + 'px';
 div.style.top = position.y + 'px';
 div.style.display = 'block';

 this.span_.innerHTML = this.get('text').toString();
};

Usage

<html>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <title>
      Label Overlay Example
    </title>
    <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
    <script type="text/javascript" src="label.js"></script>
    <script type="text/javascript">
      var marker;


      function initialize() {
        var latLng = new google.maps.LatLng(40, -100);


        var map = new google.maps.Map(document.getElementById('map_canvas'), {
          zoom: 5,
          center: latLng,
          mapTypeId: google.maps.MapTypeId.ROADMAP
        });


        marker = new google.maps.Marker({
          position: latLng,
          draggable: true,
          zIndex: 1,
          map: map,
          optimized: false
        });


        var label = new Label({
          map: map
        });
        label.bindTo('position', marker);
        label.bindTo('text', marker, 'position');
        label.bindTo('visible', marker);
        label.bindTo('clickable', marker);
        label.bindTo('zIndex', marker);


        google.maps.event.addListener(marker, 'click', function() { alert('Marker has been clicked'); })
        google.maps.event.addListener(label, 'click', function() { alert('Label has been clicked'); })
      }


      function showHideMarker() {
        marker.setVisible(!marker.getVisible());
      }


      function pinUnpinMarker() {
        var draggable = marker.getDraggable();
        marker.setDraggable(!draggable);
        marker.setClickable(!draggable);
      }
    </script>
  </head>
  <body onload="initialize()">
    <div id="map_canvas" style="height: 200px; width: 200px"></div>
    <button type="button" onclick="showHideMarker();">Show/Hide Marker</button>
    <button type="button" onclick="pinUnpinMarker();">Pin/Unpin Marker</button>
  </body>
</html>

XML element with attribute and content using JAXB

The correct scheme should be:

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" 
targetNamespace="http://www.example.org/Sport"
xmlns:tns="http://www.example.org/Sport" 
elementFormDefault="qualified"
xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" 
jaxb:version="2.0">

<complexType name="sportType">
    <simpleContent>
        <extension base="string">
            <attribute name="type" type="string" />
            <attribute name="gender" type="string" />
        </extension>
    </simpleContent>
</complexType>

<element name="sports">
    <complexType>
        <sequence>
            <element name="sport" minOccurs="0" maxOccurs="unbounded"
                type="tns:sportType" />
        </sequence>
    </complexType>
</element>

Code generated for SportType will be:

package org.example.sport;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;


@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "sportType")
public class SportType {
    @XmlValue
    protected String value;
    @XmlAttribute
    protected String type;
    @XmlAttribute
    protected String gender;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String getType() {
    return type;
    }


    public void setType(String value) {
        this.type = value;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String value) {
        this.gender = value;
    }
}

How to create a directory in Java?

Though this question has been answered. I would like to put something extra, i.e. if there is a file exist with the directory name that you are trying to create than it should prompt an error. For future visitors.

public static void makeDir()
{
    File directory = new File(" dirname ");
    if (directory.exists() && directory.isFile())
    {
        System.out.println("The dir with name could not be" +
        " created as it is a normal file");
    }
    else
    {
        try
        {
            if (!directory.exists())
            {
                directory.mkdir();
            }
            String username = System.getProperty("user.name");
            String filename = " path/" + username + ".txt"; //extension if you need one

        }
        catch (IOException e)
        {
            System.out.println("prompt for error");
        }
    }
}

[ :Unexpected operator in shell programming

In fact the "[" square opening bracket is just an internal shell alias for the test command.

So you can say:

test -f "/bin/bash" && echo "This system has a bash shell"

[ -f "/bin/bash" ] && echo "This system has a bash shell"

... they are equivalent in either sh or bash. Note the requirement to have a closing "]" bracket on the "[" command but other than that "[" is the same as "test". "man test" is a good thing to read.

What is the difference between HTTP 1.1 and HTTP 2.0?

HTTP/2 supports queries multiplexing, headers compression, priority and more intelligent packet streaming management. This results in reduced latency and accelerates content download on modern web pages.

More details here.

Find a pair of elements from an array whose sum equals a given number

in C#:

        int[] array = new int[] { 1, 5, 7, 2, 9, 8, 4, 3, 6 }; // given array
        int sum = 10; // given sum
        for (int i = 0; i <= array.Count() - 1; i++)
            if (array.Contains(sum - array[i]))
                Console.WriteLine("{0}, {1}", array[i], sum - array[i]);

Android studio logcat nothing to show

Nothing from all of this helped, my logcat was disfunctional.

After a lot of angry searching I found a solution that seems to work:
1. Make sure logcat itself is working (use DDMS from Tools->Android) and if it does close DDMS window again
2. Now go to Tab 5 (Debug), there select Logcat (this is not the same logcat as in Window 6!)
3. The window is empty just like Window 6, but now start a debugging run.
For me logcat in the Debug window now started to show all the stuff again!
Also when normally running the application the Debug->logcat view is still functional while the Tool Window #6 "logcat" is disfunctional as before

This is a hack, however it leads to the normal logcat behaviour with highlighted lines and syntax you need for debugging and developing. Just from now on you need to access it through the debug Window.

datatable jquery - table header width not aligned with body width

When scrolling is enabled in DataTables using scrollX or scrollY parameters, it will split the entire table into two or three individual HTML table elements; the header, the body and, optionally, the footer. This is done in order to provide the ability to scroll the different sections of the DataTable in a cross-browser manner.

In my case I wanted to have horizontal scroll bar because content are scrolling to right. So adding "scrollX" parameter created this issue in some of the pages which are having more columns.

Below code wrap a div around the DataTable with style "overflow as auto". We need to add div when dataTable completed the execution. We can do this as below:

$('#DataTableID').DataTable({
  //"scrollX": true,            
  "initComplete": function (settings, json) {  
    $("#DataTableID").wrap("<div style='overflow:auto; width:100%;position:relative;'></div>");            
  },
});

If you are using the scrollX,scrollY, scrollXInner or sScrollXInner options - remove them. They may cause problems.

Source: http://sforsuresh.in/datatables-header-body-not-aligned

get basic SQL Server table structure information

For total columns information use below syntax : Use "DBName" go Exec SP_Columns "TableName"

For total table information use below syntax : Use "DBName" go Exec SP_help "Table Name"

Excel - find cell with same value in another worksheet and enter the value to the left of it

The easiest way is probably with VLOOKUP(). ~~This will require the 2nd worksheet to have the employee number column sorted though.~~ In newer versions of Excel, apparently sorting is no longer required.

For example, if you had a "Sheet2" with two columns - A = the employee number, B = the employee's name, and your current worksheet had employee numbers in column D and you want to fill in column E, in cell E2, you would have:

=VLOOKUP($D2, Sheet2!$A$2:$B$65535, 2, FALSE)

Then simply fill this formula down the rest of column D.

Explanation:

The first argument $D2 specifies the value to search for.
The second argument Sheet2!$A$2:$B$65535 specifies the range of cells to search in. Excel will search for the value in the first column of this range (in this case Sheet2!A2:A65535). Note I am assuming you have a header cell in row 1.
The third argument 2 specifies a 1-based index of the column to return from within the searched range. The value of 2 will return the second column in the range Sheet2!$A$2:$B$65535, namely the value of the B column.
The fourth argument FALSE says to only return exact matches.

Running PowerShell as another user, and launching a script

You can open a new powershell window under a specified user credential like this:

start powershell -credential ""

"Access is denied" JavaScript error when trying to access the document object of a programmatically-created <iframe> (IE-only)

if the document.domain property is set in the parent page, Internet Explorer gives me an "Access is denied"

Sigh. Yeah, it's an IE issue (bug? difficult to say as there is no documented standard for this kind of unpleasantness). When you create a srcless iframe it receives a document.domain from the parent document's location.host instead of its document.domain. At that point you've pretty much lost as you can't change it.

A horrendous workaround is to set src to a javascript: URL (urgh!):

 iframe.src= "javascript:'<html><body><p>Hello<\/p><script>do things;<\/script>'";

But for some reason, such a document is unable to set its own document.domain from script in IE (good old “unspecified error”), so you can't use that to regain a bridge between the parent(*). You could use it to write the whole document HTML, assuming the widget doesn't need to talk to its parent document once it's instantiated.

However iframe JavaScript URLs don't work in Safari, so you'd still need some kind of browser-sniffing to choose which method to use.

*: For some other reason, you can, in IE, set document.domain from a second document, document.written by the first document. So this works:

if (isIE)
    iframe.src= "javascript:'<script>window.onload=function(){document.write(\\'<script>document.domain=\\\""+document.domain+"\\\";<\\\\/script>\\');document.close();};<\/script>'";

At this point the hideousness level is too high for me, I'm out. I'd do the external HTML like David said.

What is the correct way to do a CSS Wrapper?

Centering content has so many avenues that it can't really be explored in a single answer. If you would like to explore them, CSS Zen Garden is an enjoyable-if-old resource exploring the many, many ways to layout content in a way even old browsers will tolerate.

The correct way, if you don't have any mitigating requirements, is to just apply margin: auto to the sides, and a width. If your page has no content that needs to go outside those margins, just apply it to the body:

body {
  padding: 0;
  margin: 15px auto;
  width: 500px;
}

https://jsfiddle.net/b9chris/62wgq8nk/

So here we've got a 500px wide set of content centered at all* sizes. The padding 0 is to deal with some browsers that like to apply some default padding and throw us off a bit. In the example I do wrap the content in an article tag to be nice to Screen Readers, Pocket, etc so for example the blind can jump past the nav you likely have (which should be in nav) and straight to the content.

I say all* because below 500px this will mess up - we're not being Responsive. To get Responsive, you could just use Bootstrap etc, but building it yourself you use a Media Query like:

body {
  padding: 0;

  margin: 15px;
  @media (min-width: 500px) {
    margin: 15px auto;
    width: 500px;
  }
}

Note that this is SCSS/SASS syntax - if you're using plain CSS, it's inverted:

body {
  padding: 0;  
  margin: 15px;
}

@media (min-width: 500px) {
  body {
    margin: 15px auto;
    width: 500px;
  }
}

https://jsfiddle.net/b9chris/62wgq8nk/6/

It's common however to want to center just one chunk of a page, so let's apply this to only the article tag in a final example.

body {
  padding: 0;
  margin: 0;
}

nav {
  width: 100%;
  box-sizing: border-box;
  padding: 15px;
}

article {
  margin: 15px;
  @media (min-width: 500px) {
    margin: 15px auto;
    width: 500px;
  }
}

https://jsfiddle.net/b9chris/62wgq8nk/17/

Note that this final example also uses CSS Flexbox in the nav, which is also one of the newer ways you could center things. So, that's fun.

But, there are special circumstances where you need to use other approaches to center content, and each of those is probably worth its own question (many of them already asked and answered here on this site).

How to do a PUT request with curl?

An example PUT following Martin C. Martin's comment:

curl -T filename.txt http://www.example.com/dir/

With -T (same as --upload-file) curl will use PUT for HTTP.

Laravel Blade html image

in my case this worked perfectly

<img  style="border-radius: 50%;height: 50px;width: 80px;"  src="<?php echo asset("storage/TeacherImages/{$studydata->teacher->profilePic}")?>">

this code is used to display image from folder

How do you update a DateTime field in T-SQL?

Using a DateTime parameter is the best way. However, if you still want to pass a DateTime as a string, then the CAST should not be necessary provided that a language agnostic format is used.

e.g.

Given a table created like :

create table t1 (id int, EndDate DATETIME)
insert t1 (id, EndDate) values (1, GETDATE())

The following should always work :

update t1 set EndDate = '20100525' where id = 1 -- YYYYMMDD is language agnostic

The following will work :

SET LANGUAGE us_english
update t1 set EndDate = '2010-05-25' where id = 1

However, this won't :

SET LANGUAGE british
update t1 set EndDate = '2010-05-25' where id = 1

This is because 'YYYY-MM-DD' is not a language agnostic format (from SQL server's point of view) .

The ISO 'YYYY-MM-DDThh:mm:ss' format is also language agnostic, and useful when you need to pass a non-zero time.

More info : http://karaszi.com/the-ultimate-guide-to-the-datetime-datatypes

How to get the file path from URI?

Here is the answer to the question here

Actually we have to get it from the sharable ContentProvider of Camera Application.

EDIT . Copying answer that worked for me

private String getRealPathFromURI(Uri contentUri) {
String[] proj = { MediaStore.Images.Media.DATA };
CursorLoader loader = new CursorLoader(mContext, contentUri, proj, null, null, null);
Cursor cursor = loader.loadInBackground();
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String result = cursor.getString(column_index);
cursor.close();
return result;

}

How do I remove an object from an array with JavaScript?

I use this quite a bit so I created a small prototype. Simply looks for the item then pulls it out if there is a match.

//Prototype to remove object from array, removes first
//matching object only
Array.prototype.remove = function (v) {
    if (this.indexOf(v) != -1) {
        this.splice(this.indexOf(v), 1);
        return true;
    }
    return false;
}

Can be called like:

var arr = [12, 34, 56];
arr.remove(34);

The result would be [12, 56]

Has a boolean return if there was a successful remove, false if the element didn't exist.

Autocompletion in Vim

is what you are looking for something like intellisense?

insevim seems to address the issue.

link to screenshots here

Why does Eclipse complain about @Override on interface methods?

By configuring that the IDE projects are setup to use a Java 6 JRE or above sometimes does not remove the eclipse error. For me a restart of the Eclipe IDE helped.

Copy mysql database from remote server to local computer

Assuming the following command works successfully:

mysql -u username -p -h remote.site.com

The syntax for mysqldump is identical, and outputs the database dump to stdout. Redirect the output to a local file on the computer:

mysqldump -u username -p -h remote.site.com DBNAME > backup.sql

Replace DBNAME with the name of the database you'd like to download to your computer.

Insert a new row into DataTable

// create table
var dt = new System.Data.DataTable("tableName");

// create fields
dt.Columns.Add("field1", typeof(int));
dt.Columns.Add("field2", typeof(string));
dt.Columns.Add("field3", typeof(DateTime));

// insert row values
dt.Rows.Add(new Object[]{
                123456,
                "test",
                DateTime.Now
           });

XAMPP - Error: MySQL shutdown unexpectedly

if you inistalled mysql Independently you can stop mysql service if running no one of these answers are worked for me this work for me

Scrolling to element using webdriver?

You are trying to run Java code with Python. In Python/Selenium, the org.openqa.selenium.interactions.Actions are reflected in ActionChains class:

from selenium.webdriver.common.action_chains import ActionChains

element = driver.find_element_by_id("my-id")

actions = ActionChains(driver)
actions.move_to_element(element).perform()

Or, you can also "scroll into view" via scrollIntoView():

driver.execute_script("arguments[0].scrollIntoView();", element)

If you are interested in the differences:

scrollIntoView vs moveToElement

Java: notify() vs. notifyAll() all over again

While there are some solid answers above, I am surprised by the number of confusions and misunderstandings I have read. This probably proves the idea that one should use java.util.concurrent as much as possible instead of trying to write their own broken concurrent code.

Back to the question: to summarize, the best practice today is to AVOID notify() in ALL situations due to the lost wakeup problem. Anyone who doesn't understand this should not be allowed to write mission critical concurrency code. If you are worried about the herding problem, one safe way to achieve waking one thread up at a time is to:

Build an explicit waiting queue for the waiting threads;
Have each of the thread in the queue wait for its predecessor;
Have each thread call notifyAll() when done.

Or you can use Java.util.concurrent.*, which have already implemented this.

How to move files from one git repo to another (not a clone), preserving history

KEEPING THE DIRECTORY NAME

The subdirectory-filter (or the shorter command git subtree) works good but did not work for me since they remove the directory name from the commit info. In my scenario I just want to merge parts of one repository into another and retain the history WITH full path name.

My solution was to use the tree-filter and to simply remove the unwanted files and directories from a temporary clone of the source repository, then pull from that clone into my target repository in 5 simple steps.

# 1. clone the source
git clone ssh://<user>@<source-repo url>
cd <source-repo>
# 2. remove the stuff we want to exclude
git filter-branch --tree-filter "rm -rf <files to exclude>" --prune-empty HEAD
# 3. move to target repo and create a merge branch (for safety)
cd <path to target-repo>
git checkout -b <merge branch>
# 4. Add the source-repo as remote 
git remote add source-repo <path to source-repo>
# 5. fetch it
git pull source-repo master
# 6. check that you got it right (better safe than sorry, right?)
gitk

How does jQuery work when there are multiple elements with the same ID value?

you can simply write $('span#a').length to get the length.

Here is the Solution for your code:

console.log($('span#a').length);

try JSfiddle: https://jsfiddle.net/vickyfor2007/wcc0ab5g/2/

Response.Redirect with POST instead of Get?

HttpWebRequest is used for this.

On postback, create a HttpWebRequest to your third party and post the form data, then once that is done, you can Response.Redirect wherever you want.

You get the added advantage that you don't have to name all of your server controls to make the 3rd parties form, you can do this translation when building the POST string.

string url = "3rd Party Url";

StringBuilder postData = new StringBuilder();

postData.Append("first_name=" + HttpUtility.UrlEncode(txtFirstName.Text) + "&");
postData.Append("last_name=" + HttpUtility.UrlEncode(txtLastName.Text));

//ETC for all Form Elements

// Now to Send Data.
StreamWriter writer = null;

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";                        
request.ContentLength = postData.ToString().Length;
try
{
    writer = new StreamWriter(request.GetRequestStream());
    writer.Write(postData.ToString());
}
finally
{
    if (writer != null)
        writer.Close();
}

Response.Redirect("NewPage");

However, if you need the user to see the response page from this form, your only option is to utilize Server.Transfer, and that may or may not work.

What is the "Temporary ASP.NET Files" folder for?

These are what's known as Shadow Copy Folders.

Simplistically....and I really mean it:

When ASP.NET runs your app for the first time, it copies any assemblies found in the /bin folder, copies any source code files (found for example in the App_Code folder) and parses your aspx, ascx files to c# source files. ASP.NET then builds/compiles all this code into a runnable application.

One advantage of doing this is that it prevents the possibility of .NET assembly DLL's #(in the /bin folder) becoming locked by the ASP.NET worker process and thus not updatable.

ASP.NET watches for file changes in your website and will if necessary begin the whole process all over again.

Theoretically the folder shouldn't need any maintenance, but from time to time, and only very rarely you may need to delete contents. That said, I work for a hosting company, we run up to 1200 sites per shared server and I haven't had to touch this folder on any of the 250 or so machines for years.

This is outlined in the MSDN article Understanding ASP.NET Dynamic Compilation

bootstrap.min.js:6 Uncaught Error: Bootstrap dropdown require Popper.js

Bootstrap 4 is not yet a mature tool yet. The part of requiring another plugin to work is even more complicated especially for developers who have been using Bootstrap for a while. I have seen many ways to eliminate the error but not all work for everyone. I think the best and cleanest way to work with Bootstrap 4. Among the Bootstrap installation files, There is one with the name "bootstrap.bundle.js" that already comes with the Popper included.

Map enum in JPA with fixed values?

Possibly close related code of Pascal

@Entity
@Table(name = "AUTHORITY_")
public class Authority implements Serializable {

    public enum Right {
        READ(100), WRITE(200), EDITOR(300);

        private Integer value;

        private Right(Integer value) {
            this.value = value;
        }

        // Reverse lookup Right for getting a Key from it's values
        private static final Map<Integer, Right> lookup = new HashMap<Integer, Right>();
        static {
            for (Right item : Right.values())
                lookup.put(item.getValue(), item);
        }

        public Integer getValue() {
            return value;
        }

        public static Right getKey(Integer value) {
            return lookup.get(value);
        }

    };

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "AUTHORITY_ID")
    private Long id;

    @Column(name = "RIGHT_ID")
    private Integer rightId;

    public Right getRight() {
        return Right.getKey(this.rightId);
    }

    public void setRight(Right right) {
        this.rightId = right.getValue();
    }

}

Where to get "UTF-8" string literal in Java?

Class org.apache.commons.lang3.CharEncoding.UTF_8 is deprecated after Java 7 introduced java.nio.charset.StandardCharsets

@see JRE character encoding names
@since 2.1
@deprecated Java 7 introduced {@link java.nio.charset.StandardCharsets}, which defines these constants as
{@link Charset} objects. Use {@link Charset#name()} to get the string values provided in this class.
This class will be removed in a future release.

What's the Linq to SQL equivalent to TOP or LIMIT/OFFSET?

In VB:

from m in MyTable
take 10
select m.Foo

This assumes that MyTable implements IQueryable. You may have to access that through a DataContext or some other provider.

It also assumes that Foo is a column in MyTable that gets mapped to a property name.

See http://blogs.msdn.com/vbteam/archive/2008/01/08/converting-sql-to-linq-part-7-union-top-subqueries-bill-horst.aspx for more detail.

How can I read a whole file into a string variable

I think the best thing to do, if you're really concerned about the efficiency of concatenating all of these files, is to copy them all into the same bytes buffer.

buf := bytes.NewBuffer(nil)
for _, filename := range filenames {
  f, _ := os.Open(filename) // Error handling elided for brevity.
  io.Copy(buf, f)           // Error handling elided for brevity.
  f.Close()
}
s := string(buf.Bytes())

This opens each file, copies its contents into buf, then closes the file. Depending on your situation you may not actually need to convert it, the last line is just to show that buf.Bytes() has the data you're looking for.

C++ Boost: undefined reference to boost::system::generic_category()

After testing the proposed solutions described above, I found only these few of lines would work.

I am using Ubuntu 16.04.

cmake_minimum_required(VERSION 3.13)
project(myProject)

set(CMAKE_CXX_STANDARD 11)
add_executable(myProject main.cpp)

find_package(Boost 1.58.0 REQUIRED COMPONENTS system filesystem)
target_link_libraries(myProject ${Boost_LIBRARIES})

Add "Are you sure?" to my excel button, how can I?

Create a new sub with the following code and assign it to your button. Change the "DeleteProcess" to the name of your code to do the deletion. This will pop up a box with OK or Cancel and will call your delete sub if you hit ok and not if you hit cancel.

Sub AreYouSure()

Dim Sure As Integer

Sure = MsgBox("Are you sure?", vbOKCancel)
If Sure = 1 Then Call DeleteProcess

End Sub

Jesse

Could not transfer artifact org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from/to central (http://repo1.maven.org/maven2)

Simplify things by using the following settings.xml:

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" 
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                              http://maven.apache.org/xsd/settings-1.0.0.xsd">

 <proxies>
    <proxy>
      <id>myproxy</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>user</username>  <!-- Put your username here -->
      <password>pass</password>  <!-- Put your password here -->
      <host>123.45.6.78</host>   <!-- Put the IP address of your proxy server here -->
      <port>80</port>            <!-- Put your proxy server's port number here -->
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts> <!-- Do not use this setting unless you know what you're doing. -->
    </proxy>    
  </proxies> 
</settings>

Under Linux/Unix, place it under ~/.m2/settings.xml. Under Windows place it under c:\documents and settings\youruser\.m2\settings.xml or c:\users\youruser\.m2\settings.xml.

You don't need the <mirrors/>, <profiles/> and <settings/> sections, unless you really know what they're for.

Check if a folder exist in a directory and create them using C#

    String path = Server.MapPath("~/MP_Upload/");
    if (!Directory.Exists(path))
    {
        Directory.CreateDirectory(path);
    }

Error :- java runtime environment JRE or java development kit must be available in order to run eclipse

This problem is because of the fact that eclipse is not able to find Java ,

Check the java directory cd /Library/Java/JavaVirtualMachines///Contents/Home/jre/bin

If thats not present down JDK from http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Once JDK is installed change eclipse.ini file

On Mac: Right click on Eclipse icon and click "Show package Content"

Navigate to eclipse>Contents>Eclipse>eclipse.ini

Open the file and replace the java path after "-vm" with this

/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home/jre/bin

What is the purpose and uniqueness SHTML?

SHTML is a file extension that lets the web server know the file should be processed as using Server Side Includes (SSI).

(HTML is...you know what it is, and DHTML is Microsoft's name for Javascript+HTML+CSS or something).

You can use SSI to include a common header and footer in your pages, so you don't have to repeat code as much. Changing one included file updates all of your pages at once. You just put it in your HTML page as per normal.

It's embedded in a standard XML comment, and looks like this:

<!--#include virtual="top.shtml" -->

It's been largely superseded by other mechanisms, such as PHP includes, but some hosting packages still support it and nothing else.

You can read more in this Wikipedia article.

Java java.sql.SQLException: Invalid column index on preparing statement

Everywhere inside the query string, the wildcard should be ? instead of '?'. That should solve the problem.

EDIT :

To add to that, you need to change date '?' to to_date(?, 'yyyy-mm-dd'). Please try that and let me know.

How to store an output of shell script to a variable in Unix?

You need to start the script with a preceding dot, this will put the exported variables in the current environment.

#!/bin/bash
...
export output="SUCCESS"

Then execute it like so

chmod +x /tmp/test.sh
. /tmp/test.sh

When you need the entire output and not just a single value, just put the output in a variable like the other answers indicate

What does template <unsigned int N> mean?

Yes, it is a non-type parameter. You can have several kinds of template parameters

Type Parameters.
- Types
- Templates (only classes and alias templates, no functions or variable templates)
Non-type Parameters
- Pointers
- References
- Integral constant expressions

What you have there is of the last kind. It's a compile time constant (so-called constant expression) and is of type integer or enumeration. After looking it up in the standard, i had to move class templates up into the types section - even though templates are not types. But they are called type-parameters for the purpose of describing those kinds nonetheless. You can have pointers (and also member pointers) and references to objects/functions that have external linkage (those that can be linked to from other object files and whose address is unique in the entire program). Examples:

Template type parameter:

template<typename T>
struct Container {
    T t;
};

// pass type "long" as argument.
Container<long> test;

Template integer parameter:

template<unsigned int S>
struct Vector {
    unsigned char bytes[S];
};

// pass 3 as argument.
Vector<3> test;

Template pointer parameter (passing a pointer to a function)

template<void (*F)()>
struct FunctionWrapper {
    static void call_it() { F(); }
};

// pass address of function do_it as argument.
void do_it() { }
FunctionWrapper<&do_it> test;

Template reference parameter (passing an integer)

template<int &A>
struct SillyExample {
    static void do_it() { A = 10; }
};

// pass flag as argument
int flag;
SillyExample<flag> test;

Template template parameter.

template<template<typename T> class AllocatePolicy>
struct Pool {
    void allocate(size_t n) {
        int *p = AllocatePolicy<int>::allocate(n);
    }
};

// pass the template "allocator" as argument. 
template<typename T>
struct allocator { static T * allocate(size_t n) { return 0; } };
Pool<allocator> test;

A template without any parameters is not possible. But a template without any explicit argument is possible - it has default arguments:

template<unsigned int SIZE = 3>
struct Vector {
    unsigned char buffer[SIZE];
};

Vector<> test;

Syntactically, template<> is reserved to mark an explicit template specialization, instead of a template without parameters:

template<>
struct Vector<3> {
    // alternative definition for SIZE == 3
};

Use of min and max functions in C++

I would prefer the C++ min/max functions, if you are using C++, because they are type-specific. fmin/fmax will force everything to be converted to/from floating point.

Also, the C++ min/max functions will work with user-defined types as long as you have defined operator< for those types.

HTH

How to $http Synchronous call with AngularJS

Since sync XHR is being deprecated, it's best not to rely on that. If you need to do a sync POST request, you can use the following helpers inside of a service to simulate a form post.

It works by creating a form with hidden inputs which is posted to the specified URL.

//Helper to create a hidden input
function createInput(name, value) {
  return angular
    .element('<input/>')
    .attr('type', 'hidden')
    .attr('name', name)
    .val(value);
}

//Post data
function post(url, data, params) {

    //Ensure data and params are an object
    data = data || {};
    params = params || {};

    //Serialize params
    const serialized = $httpParamSerializer(params);
    const query = serialized ? `?${serialized}` : '';

    //Create form
    const $form = angular
        .element('<form/>')
        .attr('action', `${url}${query}`)
        .attr('enctype', 'application/x-www-form-urlencoded')
        .attr('method', 'post');

    //Create hidden input data
    for (const key in data) {
        if (data.hasOwnProperty(key)) {
            const value = data[key];
            if (Array.isArray(value)) {
                for (const val of value) {
                    const $input = createInput(`${key}[]`, val);
                    $form.append($input);
                }
            }
            else {
                const $input = createInput(key, value);
                $form.append($input);
            }
        }
    }

    //Append form to body and submit
    angular.element(document).find('body').append($form);
    $form[0].submit();
    $form.remove();
}

Modify as required for your needs.

How do I append a node to an existing XML file in java

The following complete example will read an existing server.xml file from the current directory, append a new Server and re-write the file to server.xml. It does not work without an existing .xml file, so you will need to modify the code to handle that case.

import java.util.*;
import javax.xml.transform.*;
import javax.xml.transform.stream.*;
import javax.xml.transform.dom.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;

public class AddXmlNode {
    public static void main(String[] args) throws Exception {

        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        Document document = documentBuilder.parse("server.xml");
        Element root = document.getDocumentElement();

        Collection<Server> servers = new ArrayList<Server>();
        servers.add(new Server());

        for (Server server : servers) {
            // server elements
            Element newServer = document.createElement("server");

            Element name = document.createElement("name");
            name.appendChild(document.createTextNode(server.getName()));
            newServer.appendChild(name);

            Element port = document.createElement("port");
            port.appendChild(document.createTextNode(Integer.toString(server.getPort())));
            newServer.appendChild(port);

            root.appendChild(newServer);
        }

        DOMSource source = new DOMSource(document);

        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        StreamResult result = new StreamResult("server.xml");
        transformer.transform(source, result);
    }

    public static class Server {
        public String getName() { return "foo"; }
        public Integer getPort() { return 12345; }
    }
}

Example server.xml file:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Servers>
  <server>
    <name>something</name>
    <port>port</port>
  </server>
</Servers>

The main change to your code is not creating a new "root" element. The above example just uses the current root node from the existing server.xml and then just appends a new Server element and re-writes the file.

Django - what is the difference between render(), render_to_response() and direct_to_template()?

From django docs:

render() is the same as a call to render_to_response() with a context_instance argument that that forces the use of a RequestContext.

direct_to_template is something different. It's a generic view that uses a data dictionary to render the html without the need of the views.py, you use it in urls.py. Docs here

what does Error "Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)" mean?

try to clear workspace.

rm -rf ' ~/Library/Application\ Support/"your programm name" '

What is the LDF file in SQL Server?

The LDF file holds the database transaction log. See, for example, http://www.databasedesign-resource.com/sql-server-transaction-log.html for a full explanation. There are ways to shrink the transaction file; for example, see http://support.microsoft.com/kb/873235.

How to regex in a MySQL query

I think you can use REGEXP instead of LIKE

SELECT trecord FROM `tbl` WHERE (trecord REGEXP '^ALA[0-9]')

Read only file system on Android

While I know the question is about the real device, in case someone got here with a similar issue in the emulator, with whatever tools are the latest as of Feb, 2017, the emulator needs to be launched from the command line with:

-writable-system

For anything to be writable to the /system. Without this flag no combination of remount or mount will allow one to write to /system.

After the emulator is launched with that flag, a single adb remount after adb root is sufficient to get permissions to push to /system.

Here's an example of the command line I use to run my emulator:

./emulator -writable-system -avd Nexus_5_API_25 -no-snapshot-load -qemu

The value for the -avd flags comes from:

./emulator -list-avds

PHP - get base64 img string decode and save as jpg (resulting empty image )

Client need to send base64 to server.

And above answer described code is work perfectly:

$imageData = base64_decode($imageData);
$source = imagecreatefromstring($imageData);
$rotate = imagerotate($source, $angle, 0); // if want to rotate the image
$imageSave = imagejpeg($rotate,$imageName,100);
imagedestroy($source);

Thanks

top -c command in linux to filter processes listed based on processname

@perreal's command works great! If you forget, try in two steps...

example: filter top to display only application called yakuake:

$ pgrep yakuake
1755

$ top -p 1755

useful top interactive commands 'c' : toggle full path vs. command name 'k' : kill by PID 'F' : filter by... select with arrows... then press 's' to set the sort

the answer below is good too... I was looking for that today but couldn't find it. Thanks

How to Deserialize JSON data?

You can deserialize this really easily. The data's structure in C# is just List<string[]> so you could just do;

  List<string[]> data = JsonConvert.DeserializeObject<List<string[]>>(jsonString);

The above code is assuming you're using json.NET.

EDIT: Note the json is technically an array of string arrays. I prefer to use List<string[]> for my own declaration because it's imo more intuitive. It won't cause any problems for json.NET, if you want it to be an array of string arrays then you need to change the type to (I think) string[][] but there are some funny little gotcha's with jagged and 2D arrays in C# that I don't really know about so I just don't bother dealing with it here.

Why is C so fast, and why aren't other languages as fast or faster?

I guess you forgot that Assembly language is also a language :)

But seriously, C programs are faster only when the programmer knows what he's doing. You can easily write a C program that runs slower than programs written in other languages that do the same job.

The reason why C is faster is because it is designed in this way. It lets you do a lot of "lower level" stuff that helps the compiler to optimize the code. Or, shall we say, you the programmer are responsible for optimizing the code. But it's often quite tricky and error prone.

Other languages, like others already mentioned, focus more on productivity of the programmer. It is commonly believed that programmer time is much more expensive than machine time (even in the old days). So it makes a lot of sense to minimize the time programmers spend on writing and debugging programs instead of the running time of the programs. To do that, you will sacrifice a bit on what you can do to make the program faster because a lot of things are automated.

Python dictionary get multiple values

You can use At from pydash:

from pydash import at
dict = {'a': 1, 'b': 2, 'c': 3}
list = at(dict, 'a', 'b')
list == [1, 2]

Rotating a Div Element in jQuery

To rotate a DIV Make use of WebkitTransform / -moz-transform: rotate(Xdeg).

This will not work in IE. The Raphael library does work with IE and it does rotation. I believe it uses canvases

If you want to animate the rotation, you can use a recursive setTimeout()

You could probably even do part of a spin with jQuery's .animate()

Make sure that you consider the width of your element. If rotate an that has a larger width than its visible content, you'll get funny results. However you can narrow the widths of elements, and then rotate them.

Here is a simply jQuery snippet that rotates the elements in a jQuery object. Rotatation can be started and stopped:

$(function() {
    var $elie = $(selectorForElementsToRotate);
    rotate(0);
    function rotate(degree) {

          // For webkit browsers: e.g. Chrome
        $elie.css({ WebkitTransform: 'rotate(' + degree + 'deg)'});
          // For Mozilla browser: e.g. Firefox
        $elie.css({ '-moz-transform': 'rotate(' + degree + 'deg)'});

          // Animate rotation with a recursive call
        setTimeout(function() { rotate(++degree); },5);
    }
});

jsFiddle example

Note:
Taking the degree and increasing it, will rotate the image clockwise. Decreasing the degree of rotation will rotate the image counter clockwise.

When to choose mouseover() and hover() function?

You can try it out http://api.jquery.com/mouseover/ on the jQuery doc page. It's a nice little, interactive demo that makes it very clear and you can actually see for yourself.

In short, you'll notice that a mouse over event occurs on an element when you are over it - coming from either its child OR parent element, but a mouse enter event only occurs when the mouse moves from the parent element to the element.

Count number of 1's in binary representation

Two ways::

/* Method-1 */
int count1s(long num)
{
    int tempCount = 0;

    while(num)
    {
        tempCount += (num & 1); //inc, based on right most bit checked
        num = num >> 1;         //right shift bit by 1
    }

    return tempCount;
}

/* Method-2 */
int count1s_(int num)
{
    int tempCount = 0;

    std::string strNum = std::bitset< 16 >( num ).to_string(); // string conversion
    cout << "strNum=" << strNum << endl;
    for(int i=0; i<strNum.size(); i++)
    {
        if('1' == strNum[i])
        {
            tempCount++;
        }
    }

    return tempCount;
}

/* Method-3 (algorithmically - boost string split could be used) */
1) split the binary string over '1'.
2) count = vector (containing splits) size - 1

Usage::

    int count = 0;

    count = count1s(0b00110011);
    cout << "count(0b00110011) = " << count << endl; //4

    count = count1s(0b01110110);
    cout << "count(0b01110110) = " << count << endl;  //5

    count = count1s(0b00000000);
    cout << "count(0b00000000) = " << count << endl;  //0

    count = count1s(0b11111111);
    cout << "count(0b11111111) = " << count << endl;  //8

    count = count1s_(0b1100);
    cout << "count(0b1100) = " << count << endl;  //2

    count = count1s_(0b11111111);
    cout << "count(0b11111111) = " << count << endl;  //8

    count = count1s_(0b0);
    cout << "count(0b0) = " << count << endl;  //0

    count = count1s_(0b1);
    cout << "count(0b1) = " << count << endl;  //1

Why should a Java class implement comparable?

Quoted from the javadoc;

This interface imposes a total ordering on the objects of each class that implements it. This ordering is referred to as the class's natural ordering, and the class's compareTo method is referred to as its natural comparison method.

Lists (and arrays) of objects that implement this interface can be sorted automatically by Collections.sort (and Arrays.sort). Objects that implement this interface can be used as keys in a sorted map or as elements in a sorted set, without the need to specify a comparator.

Edit: ..and made the important bit bold.

initializing a Guava ImmutableMap

Notice that your error message only contains five K, V pairs, 10 arguments total. This is by design; the ImmutableMap class provides six different of() methods, accepting between zero and five key-value pairings. There is not an of(...) overload accepting a varags parameter because K and V can be different types.

You want an ImmutableMap.Builder:

ImmutableMap<String,String> myMap = ImmutableMap.<String, String>builder()
    .put("key1", "value1") 
    .put("key2", "value2") 
    .put("key3", "value3") 
    .put("key4", "value4") 
    .put("key5", "value5") 
    .put("key6", "value6") 
    .put("key7", "value7") 
    .put("key8", "value8") 
    .put("key9", "value9")
    .build();

How to modify WooCommerce cart, checkout pages (main theme portion)

Another way to totally override the cart.php is to copy:

woocommerce/templates/cart/cart.php to   
yourtheme/woocommerce/cart/cart.php

Then do whatever you need at the yourtheme/woocommerce/cart/cart.php

Converting <br /> into a new line for use in a text area

Here is another approach.

class orbisius_custom_string {
    /**
     * The reverse of nl2br. Handles <br/> <br/> <br />
     * usage: orbisius_custom_string::br2nl('Your buffer goes here ...');
     * @param str $buff
     * @return str
     * @author Slavi Marinov | http://orbisius.com
     */
    public static function br2nl($buff = '') {
        $buff = preg_replace('#<br[/\s]*>#si', "\n", $buff);
        $buff = trim($buff);

        return $buff;
    }
}

Android View shadow

Use the elevation property for shadow affect:

<YourView
    ...
    android:elevation="3dp"/>

Intent.putExtra List

 //To send from the activity that is calling another activity via myIntent

    myIntent.putExtra("id","10");
    startActivity(myIntent);

    //To receive from another Activity

            Bundle bundle = getIntent().getExtras();
            String id=bundle.getString("id");

Java - Check if input is a positive integer, negative integer, natural number and so on.

If you really have to avoid operators then use Math.signum()

Returns the signum function of the argument; zero if the argument is zero, 1.0 if the argument is greater than zero, -1.0 if the argument is less than zero.

EDIT : As per the comments, this works for only double and float values. For integer values you can use the method:

Integer.signum(int i)

Jquery how to find an Object by attribute in an Array

copied from polyfill Array.prototype.find code of Array.find, and added the array as first parameter.

you can pass the search term as predicate function

_x000D_

// Example_x000D_
var listOfObjects = [{key: "1", value: "one"}, {key: "2", value: "two"}]_x000D_
var result = findInArray(listOfObjects, function(element) {_x000D_
  return element.key == "1";_x000D_
});_x000D_
console.log(result);_x000D_
_x000D_
// the function you want_x000D_
function findInArray(listOfObjects, predicate) {_x000D_
      if (listOfObjects == null) {_x000D_
        throw new TypeError('listOfObjects is null or not defined');_x000D_
      }_x000D_
_x000D_
      var o = Object(listOfObjects);_x000D_
_x000D_
      var len = o.length >>> 0;_x000D_
_x000D_
      if (typeof predicate !== 'function') {_x000D_
        throw new TypeError('predicate must be a function');_x000D_
      }_x000D_
_x000D_
      var thisArg = arguments[1];_x000D_
_x000D_
      var k = 0;_x000D_
_x000D_
      while (k < len) {_x000D_
        var kValue = o[k];_x000D_
        if (predicate.call(thisArg, kValue, k, o)) {_x000D_
          return kValue;_x000D_
        }_x000D_
        k++;_x000D_
      }_x000D_
_x000D_
      return undefined;_x000D_
}

_x000D_

Ignoring NaNs with str.contains

df[df.col.str.contains("foo").fillna(False)]

How do I enable --enable-soap in php on linux?

As far as your question goes: no, if activating from .ini is not enough and you can't upgrade PHP, there's not much you can do. Some modules, but not all, can be added without recompilation (zypper install php5-soap, yum install php-soap). If it is not enough, try installing some PEAR class for interpreted SOAP support (NuSOAP, etc.).

In general, the double-dash --switches are designed to be used when recompiling PHP from scratch.

You would download the PHP source package (as a compressed .tgz tarball, say), expand it somewhere and then, e.g. under Linux, run the configure script

./configure --prefix ...

The configure command used by your PHP may be shown with phpinfo(). Repeating it identical should give you an exact copy of the PHP you now have installed. Adding --enable-soap will then enable SOAP in addition to everything else.

That said, if you aren't familiar with PHP recompilation, don't do it. It also requires several ancillary libraries that you might, or might not, have available - freetype, gd, libjpeg, XML, expat, and so on and so forth (it's not enough they are installed; they must be a developer version, i.e. with headers and so on; in most distributions, having libjpeg installed might not be enough, and you might need libjpeg-dev also).

I have to keep a separate virtual machine with everything installed for my recompilation purposes.

How do you replace double quotes with a blank space in Java?

Use String#replace().

To replace them with spaces (as per your question title):

System.out.println("I don't like these \"double\" quotes".replace("\"", " "));

The above can also be done with characters:

System.out.println("I don't like these \"double\" quotes".replace('"', ' '));

To remove them (as per your example):

System.out.println("I don't like these \"double\" quotes".replace("\"", ""));

How to build PDF file from binary string returned from a web-service using javascript

You can use PDF.js to create PDF files from javascript... it's easy to code... hope this solve your doubt!!!

Regards!

How do you make a div follow as you scroll?

You can use the fixed CSS position property to accomplish this. There is a basic tutorial on this here.

EDIT: However, this approach is NOT supported in IE versions < IE7, and only in IE7 if it is in standards mode. This is discussed in a little more detail here.

There is also a hack, explained here, that shows how to accomplish fixed positioning in IE6 without affecting absolute positioning. What version of IE are you targeting your website for?

Docker "ERROR: could not find an available, non-overlapping IPv4 address pool among the defaults to assign to the network"

Killing the vpn is not needed.

This other comment about using a new network comes pretty close to the solution for me, and was working for a while, but I found a better way thanks to some talk over in another question

Create a network with:

docker network create your-network --subnet 172.24.24.0/24

Then, at the bottom of docker-compose.yaml, put this:

networks:
  default:
    external: 
      name: your-network

Done. No need to add networks to all container definitions etc. and you can re-use the network with other docker-compose files as well if you'd like.

How do I convert a list into a string with spaces in Python?

So in order to achieve a desired output, we should first know how the function works.

The syntax for join() method as described in the python documentation is as follows:

string_name.join(iterable)

Things to be noted:

It returns a string concatenated with the elements of iterable. The separator between the elements being the string_name.
Any non-string value in the iterable will raise a TypeError

Now, to add white spaces, we just need to replace the string_name with a " " or a ' ' both of them will work and place the iterable that we want to concatenate.

So, our function will look something like this:

' '.join(my_list)

But, what if we want to add a particular number of white spaces in between our elements in the iterable ?

We need to add this:

str(number*" ").join(iterable)

here, the number will be a user input.

So, for example if number=4.

Then, the output of str(4*" ").join(my_list) will be how are you, so in between every word there are 4 white spaces.

How to add a RequiredFieldValidator to DropDownList control?

Suppose your drop down list is:

<asp:DropDownList runat="server" id="ddl">
<asp:ListItem Value="0" text="Select a Value">
....
</asp:DropDownList>

There are two ways:

<asp:RequiredFieldValidator ID="re1" runat="Server" InitialValue="0" />

the 2nd way is to use a compare validator:

<asp:CompareValidator ID="re1" runat="Server" ValueToCompare="0" ControlToCompare="ddl" Operator="Equal" />

Why is Visual Studio 2010 not able to find/open PDB files?

For VS2013 users who find themselves here as I did:

Tools -> Options -> Debugging -> Symbols

You'll see that the Cache symbols in this directory: field is empty; you can either browse/enter the path yourself or just go ahead and click the Load all symbols button. An alert window will appear saying "Since you haven't selected a symbol-cache directory the default will be used". You'll now see C:\Users\XXXX\AppData\Local\Temp\SymbolCache in the previously empty path-field. Click Load all symbols a second time and you should be set. Hit ok, and just for the sake of diligence, clean and rebuild your solution.

Force an SVN checkout command to overwrite current files

Try the --force option. svn help checkout gives the details.

Cannot set some HTTP headers when using System.Net.WebRequest

I ran into this problem with a custom web client. I think people may be getting confused because of multiple ways to do this. When using WebRequest.Create() you can cast to an HttpWebRequest and use the property to add or modify a header. When using a WebHeaderCollection you may use the .Add("referer","my_url").

Ex 1

WebClient client = new WebClient();
client.Headers.Add("referer", "http://stackoverflow.com");
client.Headers.Add("user-agent", "Mozilla/5.0");

Ex 2

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Referer = "http://stackoverflow.com";
request.UserAgent = "Mozilla/5.0";
response = (HttpWebResponse)request.GetResponse();

Running a CMD or BAT in silent mode

I have proposed in StackOverflow question a way to run a batch file in the background (no DOS windows displayed)

That should answer your question.

Here it is:

From your first script, call your second script with the following line:

wscript.exe invis.vbs run.bat %*

Actually, you are calling a vbs script with:

the [path]\name of your script
all the other arguments needed by your script (%*)

Then, invis.vbs will call your script with the Windows Script Host Run() method, which takes:

intWindowStyle : 0 means "invisible windows"
bWaitOnReturn : false means your first script does not need to wait for your second script to finish

See the question for the full invis.vbs script:

Set WshShell = WScript.CreateObject("WScript.Shell")
WshShell.Run """" & WScript.Arguments(0) & """" & sargs, 0, False
                                                         ^
                             means "invisible window" ---|

Update after Tammen's feedback:

If you are in a DOS session and you want to launch another script "in the background", a simple /b (as detailed in the same aforementioned question) can be enough:

You can use start /b second.bat to launch a second batch file asynchronously from your first that shares your first one's window.

HTTP GET Request in Node.js Express

If you just need to make simple get requests and don't need support for any other HTTP methods take a look at: simple-get:

var get = require('simple-get');

get('http://example.com', function (err, res) {
  if (err) throw err;
  console.log(res.statusCode); // 200
  res.pipe(process.stdout); // `res` is a stream
});

Simulate low network connectivity for Android

for and mac OS user you can use Network Link Conditioner which could be downloaded from apple. set it as a AP on mac and any divices could connected it.

you can either use facebook open source tools ATC http://facebook.github.io/augmented-traffic-control/

Capitalize words in string

function capitalize(s){
    return s.toLowerCase().replace( /\b./g, function(a){ return a.toUpperCase(); } );
};

capitalize('this IS THE wOrst string eVeR');

output: "This Is The Worst String Ever"

Update:

It appears this solution supersedes mine: https://stackoverflow.com/a/7592235/104380

Regular expression for extracting tag attributes

If you want to be general, you have to look at the precise specification of the a tag, like here. But even with that, if you do your perfect regexp, what if you have malformed html?

I would suggest to go for a library to parse html, depending on the language you work with: e.g. like python's Beautiful Soup.

How to get an element by its href in jquery?

var myElement = $("a[href='http://www.stackoverflow.com']");

http://api.jquery.com/attribute-equals-selector/

Create an ArrayList of unique values

If you need unique values, you should use the implementation of the SET interface

java create date object using a value string

It is because value coming String (Java Date object constructor for getting string is deprecated)

and Date(String) is deprecated.

Have a look at jodatime or you could put @SuppressWarnings({“deprecation”}) outside the method calling the Date(String) constructor.

How can I get Android Wifi Scan Results into a list?

Wrap an ArrayAdapter around your List<ScanResult>. Override getView() to populate your rows with the ScanResult data. Here is a free excerpt from one of my books that covers how to create custom ArrayAdapters like this.

Detecting when user scrolls to bottom of div with jQuery

Though this was asked almost 6 years, ago still hot topic in UX design, here is demo snippet if any newbie wanted to use

_x000D_

$(function() {_x000D_
_x000D_
  /* this is only for demonstration purpose */_x000D_
  var t = $('.posts').html(),_x000D_
    c = 1,_x000D_
    scroll_enabled = true;_x000D_
_x000D_
  function load_ajax() {_x000D_
_x000D_
    /* call ajax here... on success enable scroll  */_x000D_
    $('.posts').append('<h4>' + (++c) + ' </h4>' + t);_x000D_
_x000D_
    /*again enable loading on scroll... */_x000D_
    scroll_enabled = true;_x000D_
_x000D_
  }_x000D_
_x000D_
_x000D_
  $(window).bind('scroll', function() {_x000D_
    if (scroll_enabled) {_x000D_
_x000D_
      /* if 90% scrolled */_x000D_
    if($(window).scrollTop() >= ($('.posts').offset().top + $('.posts').outerHeight()-window.innerHeight)*0.9) {_x000D_
_x000D_
        /* load ajax content */_x000D_
        scroll_enabled = false;  _x000D_
        load_ajax();_x000D_
      }_x000D_
_x000D_
    }_x000D_
_x000D_
  });_x000D_
_x000D_
});

_x000D_

h4 {_x000D_
  color: red;_x000D_
  font-size: 36px;_x000D_
  background-color: yellow;_x000D_
}

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>_x000D_
<div class="posts">_x000D_
  Lorem ipsum dolor sit amet  Consectetuer augue nibh lacus at <br> Pretium Donec felis dolor penatibus <br> Phasellus consequat Vivamus dui lacinia <br> Ornare nonummy laoreet lacus Donec <br> Ut ut libero Curabitur id <br> Dui pretium hendrerit_x000D_
  sapien Pellentesque <br> Lorem ipsum dolor sit amet <br> Consectetuer augue nibh lacus at <br> Pretium Donec felis dolor penatibus <br> Phasellus consequat Vivamus dui lacinia <br> Ornare nonummy laoreet lacus Donec <br> Ut ut libero Curabitur id <br>  Dui pretium hendrerit sapien Pellentesque <br> Lorem ipsum dolor sit amet <br> Consectetuer augue nibh lacus at <br> Pretium Donec felis dolor penatibus <br> Phasellus consequat Vivamus dui lacinia <br> Ornare nonummy laoreet lacus Donec <br> Ut ut_x000D_
  libero Curabitur id <br> Dui pretium hendrerit sapien Pellentesque <br> Lorem ipsum dolor sit amet <br> Consectetuer augue nibh lacus at <br> Pretium Donec felis dolor penatibus <br> Phasellus consequat Vivamus dui lacinia <br> Ornare nonummy laoreet_x000D_
  lacus Donec <br> Ut ut libero Curabitur id <br> Dui pretium hendrerit sapien Pellentesque_x000D_
</div>

_x000D_

How can I determine the current CPU utilization from the shell?

Try this command:

$ top

http://www.cyberciti.biz/tips/how-do-i-find-out-linux-cpu-utilization.html

How can I revert multiple Git commits (already pushed) to a published repository?

The Problem

There are a number of work-flows you can use. The main point is not to break history in a published branch unless you've communicated with everyone who might consume the branch and are willing to do surgery on everyone's clones. It's best not to do that if you can avoid it.

Solutions for Published Branches

Your outlined steps have merit. If you need the dev branch to be stable right away, do it that way. You have a number of tools for Debugging with Git that will help you find the right branch point, and then you can revert all the commits between your last stable commit and HEAD.

Either revert commits one at a time, in reverse order, or use the <first_bad_commit>..<last_bad_commit> range. Hashes are the simplest way to specify the commit range, but there are other notations. For example, if you've pushed 5 bad commits, you could revert them with:

# Revert a series using ancestor notation.
git revert --no-edit dev~5..dev

# Revert a series using commit hashes.
git revert --no-edit ffffffff..12345678

This will apply reversed patches to your working directory in sequence, working backwards towards your known-good commit. With the --no-edit flag, the changes to your working directory will be automatically committed after each reversed patch is applied.

See man 1 git-revert for more options, and man 7 gitrevisions for different ways to specify the commits to be reverted.

Alternatively, you can branch off your HEAD, fix things the way they need to be, and re-merge. Your build will be broken in the meantime, but this may make sense in some situations.

The Danger Zone

Of course, if you're absolutely sure that no one has pulled from the repository since your bad pushes, and if the remote is a bare repository, then you can do a non-fast-forward commit.

git reset --hard <last_good_commit>
git push --force

This will leave the reflog intact on your system and the upstream host, but your bad commits will disappear from the directly-accessible history and won't propagate on pulls. Your old changes will hang around until the repositories are pruned, but only Git ninjas will be able to see or recover the commits you made by mistake.

Excel VBA - exit for loop

How to commit to remote git repository

just type "git push" if this doesn't give you a positive replay, then check if you are connected with your repository correctly.

How to use LINQ Distinct() with multiple fields

the solution to your problem looks like this:

public class Category {
  public long CategoryId { get; set; }
  public string CategoryName { get; set; }
}

...

public class CategoryEqualityComparer : IEqualityComparer<Category>
{
   public bool Equals(Category x, Category y)
     => x.CategoryId.Equals(y.CategoryId)
          && x.CategoryName .Equals(y.CategoryName, 
 StringComparison.OrdinalIgnoreCase);

   public int GetHashCode(Mapping obj)
     => obj == null 
         ? 0
         : obj.CategoryId.GetHashCode()
           ^ obj.CategoryName.GetHashCode();
}

...

 var distinctCategories = product
     .Select(_ => 
        new Category {
           CategoryId = _.CategoryId, 
           CategoryName = _.CategoryName
        })
     .Distinct(new CategoryEqualityComparer())
     .ToList();

Center Contents of Bootstrap row container

I solved this by doing the following:

<body class="container-fluid">
    <div class="row">
        <div class="span6" style="float: none; margin: 0 auto;">
           ....
        </div>
    </div>
</body>

Python 101: Can't open file: No such file or directory

Prior to running python, type cd in the commmand line, and it will tell you the directory you are currently in. When python runs, it can only access files in this directory. hello.py needs to be in this directory, so you can move hello.py from its existing location to this folder as you would move any other file in Windows or you can change directories and run python in the directory hello.py is.

Edit: Python cannot access the files in the subdirectory unless a path to it provided. You can access files in any directory by providing the path. python C:\Python27\Projects\hello.p

I can not find my.cnf on my windows computer

Start->Search->For Files and Folders->All Files and Folders

type "my.cnf" and hit search.

Failed to fetch URL https://dl-ssl.google.com/android/repository/addons_list-1.xml, reason: Connection to https://dl-ssl.google.com refused

I was facing same problem below is the solution that worked for me

First Go to Android SDK Manager then

select Tools then,

select Options

then check the box "Force https://... sources to be fetched using http://..."

hope it will help you also.

Setting a log file name to include current date in Log4j

I'm 99% sure that RollingFileAppender/DailyRollingFileAppender, while it gives you the date-rolling functionality you want, doesn't have any way to specify that the current log file should use the DatePattern as well.

You might just be able to simply subclass RollingFileAppender (or DailyRollingFileAppender, I forget which is which in log4net) and modify the naming logic.

Javascript "Not a Constructor" Exception while creating objects

I had a similar error and my problem was that the name and case of the variable name and constructor name were identical, which doesn't work since javascript interprets the intended constructor as the newly created variable.

In other words:

function project(name){
    this.name = name;
}

//elsewhere...

//this is no good! name/case are identical so javascript barfs. 
let project = new project('My Project');

Simply changing case or variable name fixes the problem, though:

//with a capital 'P'
function Project(name){
    this.name = name;
}

//elsewhere...

//works! class name/case is dissimilar to variable name
let project = new Project('My Project');

Tomcat request timeout

If you are trying to prevent a request from running too long, then setting a timeout in Tomcat will not help you. As Chris says, you can set the global timeout value for Tomcat. But, from The Apache Tomcat Connector - Generic HowTo Timeouts, see the Reply Timeout section:

JK can also use a timeout on request replies. This timeout does not measure the full processing time of the response. Instead it controls, how much time between consecutive response packets is allowed.

In most cases, this is what one actually wants. Consider for example long running downloads. You would not be able to set an effective global reply timeout, because downloads could last for many minutes. Most applications though have limited processing time before starting to return the response. For those applications you could set an explicit reply timeout. Applications that do not harmonise with reply timeouts are batch type applications, data warehouse and reporting applications which are expected to observe long processing times.

If JK aborts waiting for a response, because a reply timeout fired, there is no way to stop processing on the backend. Although you free processing resources in your web server, the request will continue to run on the backend - without any way to send back a result once the reply timeout fired.

So Tomcat will detect that the servlet has not responded within the timeout and will send back a response to the user, but will not stop the thread running. I don't think you can achieve what you want to do.

How can I auto increment the C# assembly version via our CI platform (Hudson)?

Here's what I did, for stamping the AssemblyFileVersion attribute.

Removed the AssemblyFileVersion from AssemblyInfo.cs

Add a new, empty, file called AssemblyFileInfo.cs to the project.

Install the MSBuild community tasks toolset on the hudson build machine or as a NuGet dependency in your project.

Edit the project (csproj) file , it's just an msbuild file, and add the following.

Somewhere there'll be a <PropertyGroup> stating the version. Change that so it reads e.g.

 <Major>1</Major>
 <Minor>0</Minor>
 <!--Hudson sets BUILD_NUMBER and SVN_REVISION -->
 <Build>$(BUILD_NUMBER)</Build>
 <Revision>$(SVN_REVISION)</Revision>

Hudson provides those env variables you see there when the project is built on hudson (assuming it's fetched from subversion).

At the bottom of the project file, add

 <Import Project="$(MSBuildExtensionsPath)\MSBuildCommunityTasks\MSBuild.Community.Tasks.Targets" Condition="Exists('$(MSBuildExtensionsPath)\MSBuildCommunityTasks\MSBuild.Community.Tasks.Targets')" />
  <Target Name="BeforeBuild" Condition="Exists('$(MSBuildExtensionsPath)\MSBuildCommunityTasks\MSBuild.Community.Tasks.Targets')">
    <Message Text="Version: $(Major).$(Minor).$(Build).$(Revision)" />
    <AssemblyInfo CodeLanguage="CS" OutputFile="AssemblyFileInfo.cs" AssemblyFileVersion="$(Major).$(Minor).$(Build).$(Revision)" AssemblyConfiguration="$(Configuration)" Condition="$(Revision) != '' " />
  </Target>

This uses the MSBuildCommunityTasks to generate the AssemblyFileVersion.cs to include an AssemblyFileVersion attribute before the project is built. You could do this for any/all of the version attributes if you want.

The result is, whenever you issue a hudson build, the resulting assembly gets an AssemblyFileVersion of 1.0.HUDSON_BUILD_NR.SVN_REVISION e.g. 1.0.6.2632 , which means the 6'th build # in hudson, buit from the subversion revision 2632.

How to destroy a DOM element with jQuery?

Is $target.remove(); what you're looking for?

https://api.jquery.com/remove/

form confirm before submit

Here's what I would do to get what you want :

$(document).ready(function() {
    $(".testform").click(function(event) {
        if( !confirm('Are you sure that you want to submit the form') ) 
            event.preventDefault();
    });
});

A slight explanation about how that code works, When the user clicks the button then the confirm dialog is launched, in case the user selects no the default action which was to submit the form is not carried out. Upon confirmation the control is passed to the browser which carries on with submitting the form. We use the standard JavaScript confirm here.

How to get primary key column in Oracle?

SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
FROM all_constraints cons, all_cons_columns cols
WHERE cols.table_name = 'TABLE_NAME'
AND cons.constraint_type = 'P'
AND cons.constraint_name = cols.constraint_name
AND cons.owner = cols.owner
ORDER BY cols.table_name, cols.position;

Make sure that 'TABLE_NAME' is in upper case since Oracle stores table names in upper case.

using href links inside <option> tag

Try this Code

<select name="forma" onchange="location = this.options[this.selectedIndex].value;">
 <option value="Home.php">Home</option>
 <option value="Contact.php">Contact</option>
 <option value="Sitemap.php">Sitemap</option>
</select>

Regex credit card number tests

Angular File Upload

In Angular 7/8/9

Source Link

Using Bootstrap Form

<form>
    <div class="form-group">
        <fieldset class="form-group">

            <label>Upload Logo</label>
            {{imageError}}
            <div class="custom-file fileInputProfileWrap">
                <input type="file" (change)="fileChangeEvent($event)" class="fileInputProfile">
                <div class="img-space">

                    <ng-container *ngIf="isImageSaved; else elseTemplate">
                        <img [src]="cardImageBase64" />
                    </ng-container>
                    <ng-template #elseTemplate>

                        <img src="./../../assets/placeholder.png" class="img-responsive">
                    </ng-template>

                </div>

            </div>
        </fieldset>
    </div>
    <a class="btn btn-danger" (click)="removeImage()" *ngIf="isImageSaved">Remove</a>
</form>

In Component Class

fileChangeEvent(fileInput: any) {
    this.imageError = null;
    if (fileInput.target.files && fileInput.target.files[0]) {
        // Size Filter Bytes
        const max_size = 20971520;
        const allowed_types = ['image/png', 'image/jpeg'];
        const max_height = 15200;
        const max_width = 25600;

        if (fileInput.target.files[0].size > max_size) {
            this.imageError =
                'Maximum size allowed is ' + max_size / 1000 + 'Mb';

            return false;
        }

        if (!_.includes(allowed_types, fileInput.target.files[0].type)) {
            this.imageError = 'Only Images are allowed ( JPG | PNG )';
            return false;
        }
        const reader = new FileReader();
        reader.onload = (e: any) => {
            const image = new Image();
            image.src = e.target.result;
            image.onload = rs => {
                const img_height = rs.currentTarget['height'];
                const img_width = rs.currentTarget['width'];

                console.log(img_height, img_width);


                if (img_height > max_height && img_width > max_width) {
                    this.imageError =
                        'Maximum dimentions allowed ' +
                        max_height +
                        '*' +
                        max_width +
                        'px';
                    return false;
                } else {
                    const imgBase64Path = e.target.result;
                    this.cardImageBase64 = imgBase64Path;
                    this.isImageSaved = true;
                    // this.previewImagePath = imgBase64Path;
                }
            };
        };

        reader.readAsDataURL(fileInput.target.files[0]);
    }
}

removeImage() {
    this.cardImageBase64 = null;
    this.isImageSaved = false;
}

How can I get a favicon to show up in my django app?

I tried the following settings in django 2.1.1

base.html

<head>
  {% load static %}
  <link rel="shortcut icon" type="image/png" href="{% static 'images/favicon.ico' %}"/>
</head>

settings.py

 STATIC_ROOT = os.path.join(BASE_DIR, 'static')
 STATIC_URL = '/static/'` <br>`.............

Project directory structure

view live here

How to list processes attached to a shared memory segment in linux?

I don't think you can do this with the standard tools. You can use ipcs -mp to get the process ID of the last process to attach/detach but I'm not aware of how to get all attached processes with ipcs.

With a two-process-attached segment, assuming they both stayed attached, you can possibly figure out from the creator PID cpid and last-attached PID lpid which are the two processes but that won't scale to more than two processes so its usefulness is limited.

The cat /proc/sysvipc/shm method seems similarly limited but I believe there's a way to do it with other parts of the /proc filesystem, as shown below:

When I do a grep on the procfs maps for all processes, I get entries containing lines for the cpid and lpid processes.

For example, I get the following shared memory segment from ipcs -m:

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0x00000000 123456     pax        600        1024       2          dest

and, from ipcs -mp, the cpid is 3956 and the lpid is 9999 for that given shared memory segment (123456).

Then, with the command grep 123456 /proc/*/maps, I see:

/proc/3956/maps: blah blah blah 123456 /SYSV000000 (deleted)
/proc/9999/maps: blah blah blah 123456 /SYSV000000 (deleted)

So there is a way to get the processes that attached to it. I'm pretty certain that the dest status and (deleted) indicator are because the creator has marked the segment for destruction once the final detach occurs, not that it's already been destroyed.

So, by scanning of the /proc/*/maps "files", you should be able to discover which PIDs are currently attached to a given segment.

Extending from two classes

it is possible

public class ParallaxViewController<T extends View & Parallaxor> extends ParallaxController<T> implements AbsListView.OnScrollListener {

//blah
}

Setting a system environment variable from a Windows batch file?

Just in case you would need to delete a variable, you could use SETENV from Vincent Fatica available at http://barnyard.syr.edu/~vefatica. Not exactly recent ('98) but still working on Windows 7 x64.

Add multiple items to already initialized arraylist in java

If you are looking to avoid multiple code lines to save space, maybe this syntax could be useful:

        java.util.ArrayList lisFieldNames = new ArrayList() {
            {
                add("value1"); 
                add("value2");
            }
        };

Removing new lines, you can show it compressed as:

        java.util.ArrayList lisFieldNames = new ArrayList() {
            {
                add("value1"); add("value2"); (...);
            }
        };

Select query to get data from SQL Server

You should use ExecuteScalar() (which returns the first row first column) instead of ExecuteNonQuery() (which returns the no. of rows affected).

You should refer differences between executescalar and executenonquery for more details.

Hope it helps!

Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs

This is not an answer but a feedback with few compilers of 2021. On Intel CoffeeLake 9900k.

With Microsoft compiler (VS2019), toolset v142:

unsigned        209695540000    1.8322 sec      28.6152 GB/s
uint64_t        209695540000    3.08764 sec     16.9802 GB/s

With Intel compiler 2021:

unsigned        209695540000    1.70845 sec     30.688 GB/s
uint64_t        209695540000    1.57956 sec     33.1921 GB/s

According to Mysticial's answer, Intel compiler is aware of False Data Dependency, but not Microsoft compiler.

For intel compiler, I used /QxHost (optimize of CPU's architecture which is that of the host) /Oi (enable intrinsic functions) and #include <nmmintrin.h> instead of #include <immintrin.h>.

Full compile command: /GS /W3 /QxHost /Gy /Zi /O2 /D "NDEBUG" /D "_CONSOLE" /D "_UNICODE" /D "UNICODE" /Qipo /Zc:forScope /Oi /MD /Fa"x64\Release\" /EHsc /nologo /Fo"x64\Release\" //fprofile-instr-use "x64\Release\" /Fp"x64\Release\Benchmark.pch" .

The decompiled (by IDA 7.5) assembly from ICC:

int __cdecl main(int argc, const char **argv, const char **envp)
{
  int v6; // er13
  _BYTE *v8; // rsi
  unsigned int v9; // edi
  unsigned __int64 i; // rbx
  unsigned __int64 v11; // rdi
  int v12; // ebp
  __int64 v13; // r14
  __int64 v14; // rbx
  unsigned int v15; // eax
  unsigned __int64 v16; // rcx
  unsigned int v17; // eax
  unsigned __int64 v18; // rcx
  __int64 v19; // rdx
  unsigned int v20; // eax
  int result; // eax
  std::ostream *v23; // rbx
  char v24; // dl
  std::ostream *v33; // rbx
  std::ostream *v41; // rbx
  __int64 v42; // rdx
  unsigned int v43; // eax
  int v44; // ebp
  __int64 v45; // r14
  __int64 v46; // rbx
  unsigned __int64 v47; // rax
  unsigned __int64 v48; // rax
  std::ostream *v50; // rdi
  char v51; // dl
  std::ostream *v58; // rdi
  std::ostream *v60; // rdi
  __int64 v61; // rdx
  unsigned int v62; // eax

  __asm
  {
    vmovdqa [rsp+98h+var_58], xmm8
    vmovapd [rsp+98h+var_68], xmm7
    vmovapd [rsp+98h+var_78], xmm6
  }
  if ( argc == 2 )
  {
    v6 = atol(argv[1]) << 20;
    _R15 = v6;
    v8 = operator new[](v6);
    if ( v6 )
    {
      v9 = 1;
      for ( i = 0i64; i < v6; i = v9++ )
        v8[i] = rand();
    }
    v11 = (unsigned __int64)v6 >> 3;
    v12 = 0;
    v13 = Xtime_get_ticks_0();
    v14 = 0i64;
    do
    {
      if ( v6 )
      {
        v15 = 4;
        v16 = 0i64;
        do
        {
          v14 += __popcnt(*(_QWORD *)&v8[8 * v16])
               + __popcnt(*(_QWORD *)&v8[8 * v15 - 24])
               + __popcnt(*(_QWORD *)&v8[8 * v15 - 16])
               + __popcnt(*(_QWORD *)&v8[8 * v15 - 8]);
          v16 = v15;
          v15 += 4;
        }
        while ( v11 > v16 );
        v17 = 4;
        v18 = 0i64;
        do
        {
          v14 += __popcnt(*(_QWORD *)&v8[8 * v18])
               + __popcnt(*(_QWORD *)&v8[8 * v17 - 24])
               + __popcnt(*(_QWORD *)&v8[8 * v17 - 16])
               + __popcnt(*(_QWORD *)&v8[8 * v17 - 8]);
          v18 = v17;
          v17 += 4;
        }
        while ( v11 > v18 );
      }
      v12 += 2;
    }
    while ( v12 != 10000 );
    _RBP = 100 * (Xtime_get_ticks_0() - v13);
    std::operator___std::char_traits_char___(std::cout, "unsigned\t");
    v23 = (std::ostream *)std::ostream::operator<<(std::cout, v14);
    std::operator___std::char_traits_char____0(v23, v24);
    __asm
    {
      vmovq   xmm0, rbp
      vmovdqa xmm8, cs:__xmm@00000000000000004530000043300000
      vpunpckldq xmm0, xmm0, xmm8
      vmovapd xmm7, cs:__xmm@45300000000000004330000000000000
      vsubpd  xmm0, xmm0, xmm7
      vpermilpd xmm1, xmm0, 1
      vaddsd  xmm6, xmm1, xmm0
      vdivsd  xmm1, xmm6, cs:__real@41cdcd6500000000
    }
    v33 = (std::ostream *)std::ostream::operator<<(v23);
    std::operator___std::char_traits_char___(v33, " sec \t");
    __asm
    {
      vmovq   xmm0, r15
      vpunpckldq xmm0, xmm0, xmm8
      vsubpd  xmm0, xmm0, xmm7
      vpermilpd xmm1, xmm0, 1
      vaddsd  xmm0, xmm1, xmm0
      vmulsd  xmm7, xmm0, cs:__real@40c3880000000000
      vdivsd  xmm1, xmm7, xmm6
    }
    v41 = (std::ostream *)std::ostream::operator<<(v33);
    std::operator___std::char_traits_char___(v41, " GB/s");
    LOBYTE(v42) = 10;
    v43 = std::ios::widen((char *)v41 + *(int *)(*(_QWORD *)v41 + 4i64), v42);
    std::ostream::put(v41, v43);
    std::ostream::flush(v41);
    v44 = 0;
    v45 = Xtime_get_ticks_0();
    v46 = 0i64;
    do
    {
      if ( v6 )
      {
        v47 = 0i64;
        do
        {
          v46 += __popcnt(*(_QWORD *)&v8[8 * v47])
               + __popcnt(*(_QWORD *)&v8[8 * v47 + 8])
               + __popcnt(*(_QWORD *)&v8[8 * v47 + 16])
               + __popcnt(*(_QWORD *)&v8[8 * v47 + 24]);
          v47 += 4i64;
        }
        while ( v47 < v11 );
        v48 = 0i64;
        do
        {
          v46 += __popcnt(*(_QWORD *)&v8[8 * v48])
               + __popcnt(*(_QWORD *)&v8[8 * v48 + 8])
               + __popcnt(*(_QWORD *)&v8[8 * v48 + 16])
               + __popcnt(*(_QWORD *)&v8[8 * v48 + 24]);
          v48 += 4i64;
        }
        while ( v48 < v11 );
      }
      v44 += 2;
    }
    while ( v44 != 10000 );
    _RBP = 100 * (Xtime_get_ticks_0() - v45);
    std::operator___std::char_traits_char___(std::cout, "uint64_t\t");
    v50 = (std::ostream *)std::ostream::operator<<(std::cout, v46);
    std::operator___std::char_traits_char____0(v50, v51);
    __asm
    {
      vmovq   xmm0, rbp
      vpunpckldq xmm0, xmm0, cs:__xmm@00000000000000004530000043300000
      vsubpd  xmm0, xmm0, cs:__xmm@45300000000000004330000000000000
      vpermilpd xmm1, xmm0, 1
      vaddsd  xmm6, xmm1, xmm0
      vdivsd  xmm1, xmm6, cs:__real@41cdcd6500000000
    }
    v58 = (std::ostream *)std::ostream::operator<<(v50);
    std::operator___std::char_traits_char___(v58, " sec \t");
    __asm { vdivsd  xmm1, xmm7, xmm6 }
    v60 = (std::ostream *)std::ostream::operator<<(v58);
    std::operator___std::char_traits_char___(v60, " GB/s");
    LOBYTE(v61) = 10;
    v62 = std::ios::widen((char *)v60 + *(int *)(*(_QWORD *)v60 + 4i64), v61);
    std::ostream::put(v60, v62);
    std::ostream::flush(v60);
    free(v8);
    result = 0;
  }
  else
  {
    std::operator___std::char_traits_char___(std::cerr, "usage: array_size in MB");
    LOBYTE(v19) = 10;
    v20 = std::ios::widen((char *)&std::cerr + *((int *)std::cerr + 1), v19);
    std::ostream::put(std::cerr, v20);
    std::ostream::flush(std::cerr);
    result = -1;
  }
  __asm
  {
    vmovaps xmm6, [rsp+98h+var_78]
    vmovaps xmm7, [rsp+98h+var_68]
    vmovaps xmm8, [rsp+98h+var_58]
  }
  return result;
}

and disassembly of main:

.text:0140001000    .686p
.text:0140001000    .mmx
.text:0140001000    .model flat
.text:0140001000
.text:0140001000 ; ===========================================================================
.text:0140001000
.text:0140001000 ; Segment type: Pure code
.text:0140001000 ; Segment permissions: Read/Execute
.text:0140001000 _text           segment para public 'CODE' use64
.text:0140001000    assume cs:_text
.text:0140001000    ;org 140001000h
.text:0140001000    assume es:nothing, ss:nothing, ds:_data, fs:nothing, gs:nothing
.text:0140001000
.text:0140001000 ; =============== S U B R O U T I N E =======================================
.text:0140001000
.text:0140001000
.text:0140001000 ; int __cdecl main(int argc, const char **argv, const char **envp)
.text:0140001000 main            proc near      ; CODE XREF: __scrt_common_main_seh+107?p
.text:0140001000      ; DATA XREF: .pdata:ExceptionDir?o
.text:0140001000
.text:0140001000 var_78          = xmmword ptr -78h
.text:0140001000 var_68          = xmmword ptr -68h
.text:0140001000 var_58          = xmmword ptr -58h
.text:0140001000
.text:0140001000    push    r15
.text:0140001002    push    r14
.text:0140001004    push    r13
.text:0140001006    push    r12
.text:0140001008    push    rsi
.text:0140001009    push    rdi
.text:014000100A    push    rbp
.text:014000100B    push    rbx
.text:014000100C    sub     rsp, 58h
.text:0140001010    vmovdqa [rsp+98h+var_58], xmm8
.text:0140001016    vmovapd [rsp+98h+var_68], xmm7
.text:014000101C    vmovapd [rsp+98h+var_78], xmm6
.text:0140001022    cmp     ecx, 2
.text:0140001025    jnz     loc_14000113E
.text:014000102B    mov     rcx, [rdx+8]    ; String
.text:014000102F    call    cs:__imp_atol
.text:0140001035    mov     r13d, eax
.text:0140001038    shl     r13d, 14h
.text:014000103C    movsxd  r15, r13d
.text:014000103F    mov     rcx, r15        ; size
.text:0140001042    call    ??_U@YAPEAX_K@Z ; operator new[](unsigned __int64)
.text:0140001047    mov     rsi, rax
.text:014000104A    test    r15d, r15d
.text:014000104D    jz      short loc_14000106E
.text:014000104F    mov     edi, 1
.text:0140001054    xor     ebx, ebx
.text:0140001056    mov     rbp, cs:__imp_rand
.text:014000105D    nop     dword ptr [rax]
.text:0140001060
.text:0140001060 loc_140001060:    ; CODE XREF: main+6C?j
.text:0140001060    call    rbp ; __imp_rand
.text:0140001062    mov     [rsi+rbx], al
.text:0140001065    mov     ebx, edi
.text:0140001067    inc     edi
.text:0140001069    cmp     rbx, r15
.text:014000106C    jb      short loc_140001060
.text:014000106E
.text:014000106E loc_14000106E:    ; CODE XREF: main+4D?j
.text:014000106E    mov     rdi, r15
.text:0140001071    shr     rdi, 3
.text:0140001075    xor     ebp, ebp
.text:0140001077    call    _Xtime_get_ticks_0
.text:014000107C    mov     r14, rax
.text:014000107F    xor     ebx, ebx
.text:0140001081    jmp     short loc_14000109F
.text:0140001081 ; ---------------------------------------------------------------------------
.text:0140001083    align 10h
.text:0140001090
.text:0140001090 loc_140001090:    ; CODE XREF: main+A2?j
.text:0140001090      ; main+EC?j ...
.text:0140001090    add     ebp, 2
.text:0140001093    cmp     ebp, 2710h
.text:0140001099    jz      loc_140001184
.text:014000109F
.text:014000109F loc_14000109F:    ; CODE XREF: main+81?j
.text:014000109F    test    r13d, r13d
.text:01400010A2    jz      short loc_140001090
.text:01400010A4    mov     eax, 4
.text:01400010A9    xor     ecx, ecx
.text:01400010AB    nop     dword ptr [rax+rax+00h]
.text:01400010B0
.text:01400010B0 loc_1400010B0:    ; CODE XREF: main+E7?j
.text:01400010B0    popcnt  rcx, qword ptr [rsi+rcx*8]
.text:01400010B6    add     rcx, rbx
.text:01400010B9    lea     edx, [rax-3]
.text:01400010BC    popcnt  rdx, qword ptr [rsi+rdx*8]
.text:01400010C2    add     rdx, rcx
.text:01400010C5    lea     ecx, [rax-2]
.text:01400010C8    popcnt  rcx, qword ptr [rsi+rcx*8]
.text:01400010CE    add     rcx, rdx
.text:01400010D1    lea     edx, [rax-1]
.text:01400010D4    xor     ebx, ebx
.text:01400010D6    popcnt  rbx, qword ptr [rsi+rdx*8]
.text:01400010DC    add     rbx, rcx
.text:01400010DF    mov     ecx, eax
.text:01400010E1    add     eax, 4
.text:01400010E4    cmp     rdi, rcx
.text:01400010E7    ja      short loc_1400010B0
.text:01400010E9    test    r13d, r13d
.text:01400010EC    jz      short loc_140001090
.text:01400010EE    mov     eax, 4
.text:01400010F3    xor     ecx, ecx
.text:01400010F5    db      2Eh
.text:01400010F5    nop     word ptr [rax+rax+00000000h]
.text:01400010FF    nop
.text:0140001100
.text:0140001100 loc_140001100:    ; CODE XREF: main+137?j
.text:0140001100    popcnt  rcx, qword ptr [rsi+rcx*8]
.text:0140001106    add     rcx, rbx
.text:0140001109    lea     edx, [rax-3]
.text:014000110C    popcnt  rdx, qword ptr [rsi+rdx*8]
.text:0140001112    add     rdx, rcx
.text:0140001115    lea     ecx, [rax-2]
.text:0140001118    popcnt  rcx, qword ptr [rsi+rcx*8]
.text:014000111E    add     rcx, rdx
.text:0140001121    lea     edx, [rax-1]
.text:0140001124    xor     ebx, ebx
.text:0140001126    popcnt  rbx, qword ptr [rsi+rdx*8]
.text:014000112C    add     rbx, rcx
.text:014000112F    mov     ecx, eax
.text:0140001131    add     eax, 4
.text:0140001134    cmp     rdi, rcx
.text:0140001137    ja      short loc_140001100
.text:0140001139    jmp     loc_140001090
.text:014000113E ; ---------------------------------------------------------------------------
.text:014000113E
.text:014000113E loc_14000113E:    ; CODE XREF: main+25?j
.text:014000113E    mov     rsi, cs:__imp_?cerr@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A ; std::ostream std::cerr
.text:0140001145    lea     rdx, aUsageArraySize ; "usage: array_size in MB"
.text:014000114C    mov     rcx, rsi        ; std::ostream *
.text:014000114F    call    std__operator___std__char_traits_char___
.text:0140001154    mov     rax, [rsi]
.text:0140001157    movsxd  rcx, dword ptr [rax+4]
.text:014000115B    add     rcx, rsi
.text:014000115E    mov     dl, 0Ah
.text:0140001160    call    cs:__imp_?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QEBADD@Z ; std::ios::widen(char)
.text:0140001166    mov     rcx, rsi
.text:0140001169    mov     edx, eax
.text:014000116B    call    cs:__imp_?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@D@Z ; std::ostream::put(char)
.text:0140001171    mov     rcx, rsi
.text:0140001174    call    cs:__imp_?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@XZ ; std::ostream::flush(void)
.text:014000117A    mov     eax, 0FFFFFFFFh
.text:014000117F    jmp     loc_1400013E2
.text:0140001184 ; ---------------------------------------------------------------------------
.text:0140001184
.text:0140001184 loc_140001184:    ; CODE XREF: main+99?j
.text:0140001184    call    _Xtime_get_ticks_0
.text:0140001189    sub     rax, r14
.text:014000118C    imul    rbp, rax, 64h ; 'd'
.text:0140001190    mov     r14, cs:__imp_?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A ; std::ostream std::cout
.text:0140001197    lea     rdx, aUnsigned  ; "unsigned\t"
.text:014000119E    mov     rcx, r14        ; std::ostream *
.text:01400011A1    call    std__operator___std__char_traits_char___
.text:01400011A6    mov     rcx, r14
.text:01400011A9    mov     rdx, rbx
.text:01400011AC    call    cs:__imp_??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@_K@Z ; std::ostream::operator<<(unsigned __int64)
.text:01400011B2    mov     rbx, rax
.text:01400011B5    mov     rcx, rax        ; std::ostream *
.text:01400011B8    call    std__operator___std__char_traits_char____0
.text:01400011BD    vmovq   xmm0, rbp
.text:01400011C2    vmovdqa xmm8, cs:__xmm@00000000000000004530000043300000
.text:01400011CA    vpunpckldq xmm0, xmm0, xmm8
.text:01400011CF    vmovapd xmm7, cs:__xmm@45300000000000004330000000000000
.text:01400011D7    vsubpd  xmm0, xmm0, xmm7
.text:01400011DB    vpermilpd xmm1, xmm0, 1
.text:01400011E1    vaddsd  xmm6, xmm1, xmm0
.text:01400011E5    vdivsd  xmm1, xmm6, cs:__real@41cdcd6500000000
.text:01400011ED    mov     r12, cs:__imp_??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@N@Z ; std::ostream::operator<<(double)
.text:01400011F4    mov     rcx, rbx
.text:01400011F7    call    r12 ; std::ostream::operator<<(double) ; std::ostream::operator<<(double)
.text:01400011FA    mov     rbx, rax
.text:01400011FD    lea     rdx, aSec       ; " sec \t"
.text:0140001204    mov     rcx, rax        ; std::ostream *
.text:0140001207    call    std__operator___std__char_traits_char___
.text:014000120C    vmovq   xmm0, r15
.text:0140001211    vpunpckldq xmm0, xmm0, xmm8
.text:0140001216    vsubpd  xmm0, xmm0, xmm7
.text:014000121A    vpermilpd xmm1, xmm0, 1
.text:0140001220    vaddsd  xmm0, xmm1, xmm0
.text:0140001224    vmulsd  xmm7, xmm0, cs:__real@40c3880000000000
.text:014000122C    vdivsd  xmm1, xmm7, xmm6
.text:0140001230    mov     rcx, rbx
.text:0140001233    call    r12 ; std::ostream::operator<<(double) ; std::ostream::operator<<(double)
.text:0140001236    mov     rbx, rax
.text:0140001239    lea     rdx, aGbS       ; " GB/s"
.text:0140001240    mov     rcx, rax        ; std::ostream *
.text:0140001243    call    std__operator___std__char_traits_char___
.text:0140001248    mov     rax, [rbx]
.text:014000124B    movsxd  rcx, dword ptr [rax+4]
.text:014000124F    add     rcx, rbx
.text:0140001252    mov     dl, 0Ah
.text:0140001254    call    cs:__imp_?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QEBADD@Z ; std::ios::widen(char)
.text:014000125A    mov     rcx, rbx
.text:014000125D    mov     edx, eax
.text:014000125F    call    cs:__imp_?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@D@Z ; std::ostream::put(char)
.text:0140001265    mov     rcx, rbx
.text:0140001268    call    cs:__imp_?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@XZ ; std::ostream::flush(void)
.text:014000126E    xor     ebp, ebp
.text:0140001270    call    _Xtime_get_ticks_0
.text:0140001275    mov     r14, rax
.text:0140001278    xor     ebx, ebx
.text:014000127A    jmp     short loc_14000128F
.text:014000127A ; ---------------------------------------------------------------------------
.text:014000127C    align 20h
.text:0140001280
.text:0140001280 loc_140001280:    ; CODE XREF: main+292?j
.text:0140001280      ; main+2DB?j ...
.text:0140001280    add     ebp, 2
.text:0140001283    cmp     ebp, 2710h
.text:0140001289    jz      loc_14000131D
.text:014000128F
.text:014000128F loc_14000128F:    ; CODE XREF: main+27A?j
.text:014000128F    test    r13d, r13d
.text:0140001292    jz      short loc_140001280
.text:0140001294    xor     eax, eax
.text:0140001296    db      2Eh
.text:0140001296    nop     word ptr [rax+rax+00000000h]
.text:01400012A0
.text:01400012A0 loc_1400012A0:    ; CODE XREF: main+2D6?j
.text:01400012A0    xor     ecx, ecx
.text:01400012A2    popcnt  rcx, qword ptr [rsi+rax*8]
.text:01400012A8    add     rcx, rbx
.text:01400012AB    xor     edx, edx
.text:01400012AD    popcnt  rdx, qword ptr [rsi+rax*8+8]
.text:01400012B4    add     rdx, rcx
.text:01400012B7    xor     ecx, ecx
.text:01400012B9    popcnt  rcx, qword ptr [rsi+rax*8+10h]
.text:01400012C0    add     rcx, rdx
.text:01400012C3    xor     ebx, ebx
.text:01400012C5    popcnt  rbx, qword ptr [rsi+rax*8+18h]
.text:01400012CC    add     rbx, rcx
.text:01400012CF    add     rax, 4
.text:01400012D3    cmp     rax, rdi
.text:01400012D6    jb      short loc_1400012A0
.text:01400012D8    test    r13d, r13d
.text:01400012DB    jz      short loc_140001280
.text:01400012DD    xor     eax, eax
.text:01400012DF    nop
.text:01400012E0
.text:01400012E0 loc_1400012E0:    ; CODE XREF: main+316?j
.text:01400012E0    xor     ecx, ecx
.text:01400012E2    popcnt  rcx, qword ptr [rsi+rax*8]
.text:01400012E8    add     rcx, rbx
.text:01400012EB    xor     edx, edx
.text:01400012ED    popcnt  rdx, qword ptr [rsi+rax*8+8]
.text:01400012F4    add     rdx, rcx
.text:01400012F7    xor     ecx, ecx
.text:01400012F9    popcnt  rcx, qword ptr [rsi+rax*8+10h]
.text:0140001300    add     rcx, rdx
.text:0140001303    xor     ebx, ebx
.text:0140001305    popcnt  rbx, qword ptr [rsi+rax*8+18h]
.text:014000130C    add     rbx, rcx
.text:014000130F    add     rax, 4
.text:0140001313    cmp     rax, rdi
.text:0140001316    jb      short loc_1400012E0
.text:0140001318    jmp     loc_140001280
.text:014000131D ; ---------------------------------------------------------------------------
.text:014000131D
.text:014000131D loc_14000131D:    ; CODE XREF: main+289?j
.text:014000131D    call    _Xtime_get_ticks_0
.text:0140001322    sub     rax, r14
.text:0140001325    imul    rbp, rax, 64h ; 'd'
.text:0140001329    mov     rdi, cs:__imp_?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@1@A ; std::ostream std::cout
.text:0140001330    lea     rdx, aUint64T   ; "uint64_t\t"
.text:0140001337    mov     rcx, rdi        ; std::ostream *
.text:014000133A    call    std__operator___std__char_traits_char___
.text:014000133F    mov     rcx, rdi
.text:0140001342    mov     rdx, rbx
.text:0140001345    call    cs:__imp_??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV01@_K@Z ; std::ostream::operator<<(unsigned __int64)
.text:014000134B    mov     rdi, rax
.text:014000134E    mov     rcx, rax        ; std::ostream *
.text:0140001351    call    std__operator___std__char_traits_char____0
.text:0140001356    vmovq   xmm0, rbp
.text:014000135B    vpunpckldq xmm0, xmm0, cs:__xmm@00000000000000004530000043300000
.text:0140001363    vsubpd  xmm0, xmm0, cs:__xmm@45300000000000004330000000000000
.text:014000136B    vpermilpd xmm1, xmm0, 1
.text:0140001371    vaddsd  xmm6, xmm1, xmm0
.text:0140001375    vdivsd  xmm1, xmm6, cs:__real@41cdcd6500000000
.text:014000137D    mov     rcx, rdi
.text:0140001380    call    r12 ; std::ostream::operator<<(double) ; std::ostream::operator<<(double)
.text:0140001383    mov     rdi, rax
.text:0140001386    lea     rdx, aSec       ; " sec \t"
.text:014000138D    mov     rcx, rax        ; std::ostream *
.text:0140001390    call    std__operator___std__char_traits_char___
.text:0140001395    vdivsd  xmm1, xmm7, xmm6
.text:0140001399    mov     rcx, rdi
.text:014000139C    call    r12 ; std::ostream::operator<<(double) ; std::ostream::operator<<(double)
.text:014000139F    mov     rdi, rax
.text:01400013A2    lea     rdx, aGbS       ; " GB/s"
.text:01400013A9    mov     rcx, rax        ; std::ostream *
.text:01400013AC    call    std__operator___std__char_traits_char___
.text:01400013B1    mov     rax, [rdi]
.text:01400013B4    movsxd  rcx, dword ptr [rax+4]
.text:01400013B8    add     rcx, rdi
.text:01400013BB    mov     dl, 0Ah
.text:01400013BD    call    cs:__imp_?widen@?$basic_ios@DU?$char_traits@D@std@@@std@@QEBADD@Z ; std::ios::widen(char)
.text:01400013C3    mov     rcx, rdi
.text:01400013C6    mov     edx, eax
.text:01400013C8    call    cs:__imp_?put@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@D@Z ; std::ostream::put(char)
.text:01400013CE    mov     rcx, rdi
.text:01400013D1    call    cs:__imp_?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QEAAAEAV12@XZ ; std::ostream::flush(void)
.text:01400013D7    mov     rcx, rsi        ; Block
.text:01400013DA    call    cs:__imp_free
.text:01400013E0    xor     eax, eax
.text:01400013E2
.text:01400013E2 loc_1400013E2:    ; CODE XREF: main+17F?j
.text:01400013E2    vmovaps xmm6, [rsp+98h+var_78]
.text:01400013E8    vmovaps xmm7, [rsp+98h+var_68]
.text:01400013EE    vmovaps xmm8, [rsp+98h+var_58]
.text:01400013F4    add     rsp, 58h
.text:01400013F8    pop     rbx
.text:01400013F9    pop     rbp
.text:01400013FA    pop     rdi
.text:01400013FB    pop     rsi
.text:01400013FC    pop     r12
.text:01400013FE    pop     r13
.text:0140001400    pop     r14
.text:0140001402    pop     r15
.text:0140001404    retn
.text:0140001404 main            endp

Coffee lake specification update "POPCNT instruction may take longer to execute than expected".

python: NameError:global name '...‘ is not defined

You need to call self.a() to invoke a from b. a is not a global function, it is a method on the class.

You may want to read through the Python tutorial on classes some more to get the finer details down.

UICollectionView - dynamic cell height?

Here is a Ray Wenderlich tutorial that shows you how to use AutoLayout to dynamically size UITableViewCells. I would think it would be the same for UICollectionViewCell.

Basically, though, you end up dequeueing and configuring a prototype cell and grabbing its height. After reading this article, I decided to NOT implement this method and just write some clear, explicit sizing code.

Here's what I consider the "secret sauce" for the entire article:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return [self heightForBasicCellAtIndexPath:indexPath];
}

- (CGFloat)heightForBasicCellAtIndexPath:(NSIndexPath *)indexPath {
    static RWBasicCell *sizingCell = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sizingCell = [self.tableView dequeueReusableCellWithIdentifier:RWBasicCellIdentifier];
    });

    [self configureBasicCell:sizingCell atIndexPath:indexPath];
    return [self calculateHeightForConfiguredSizingCell:sizingCell];
}

- (CGFloat)calculateHeightForConfiguredSizingCell:(UITableViewCell *)sizingCell {
    [sizingCell setNeedsLayout];
    [sizingCell layoutIfNeeded];

    CGSize size = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    return size.height + 1.0f; // Add 1.0f for the cell separator height
}

EDIT: I did some research into your crash and decided that there is no way to get this done without a custom XIB. While that is a bit frustrating, you should be able to cut and paste from your Storyboard to a custom, empty XIB.

Once you've done that, code like the following will get you going:

//  ViewController.m
#import "ViewController.h"
#import "CollectionViewCell.h"
@interface ViewController () <UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout> {

}
@property (weak, nonatomic) IBOutlet CollectionViewCell *cell;
@property (weak, nonatomic) IBOutlet UICollectionView   *collectionView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor lightGrayColor];
    [self.collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"cell"];
}
- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    NSLog(@"viewDidAppear...");
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 50;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return 10.0f;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 10.0f;
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return [self sizingForRowAtIndexPath:indexPath];
}
- (CGSize)sizingForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *title                  = @"This is a long title that will cause some wrapping to occur. This is a long title that will cause some wrapping to occur.";
    static NSString *subtitle               = @"This is a long subtitle that will cause some wrapping to occur. This is a long subtitle that will cause some wrapping to occur.";
    static NSString *buttonTitle            = @"This is a really long button title that will cause some wrapping to occur.";
    static CollectionViewCell *sizingCell   = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sizingCell                          = [[NSBundle mainBundle] loadNibNamed:@"CollectionViewCell" owner:self options:nil][0];
    });
    [sizingCell configureWithTitle:title subtitle:[NSString stringWithFormat:@"%@: Number %d.", subtitle, (int)indexPath.row] buttonTitle:buttonTitle];
    [sizingCell setNeedsLayout];
    [sizingCell layoutIfNeeded];
    CGSize cellSize = [sizingCell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    NSLog(@"cellSize: %@", NSStringFromCGSize(cellSize));
    return cellSize;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *title                  = @"This is a long title that will cause some wrapping to occur. This is a long title that will cause some wrapping to occur.";
    static NSString *subtitle               = @"This is a long subtitle that will cause some wrapping to occur. This is a long subtitle that will cause some wrapping to occur.";
    static NSString *buttonTitle            = @"This is a really long button title that will cause some wrapping to occur.";
    CollectionViewCell *cell                = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
    [cell configureWithTitle:title subtitle:[NSString stringWithFormat:@"%@: Number %d.", subtitle, (int)indexPath.row] buttonTitle:buttonTitle];
    return cell;
}
@end

The code above (along with a very basic UICollectionViewCell subclass and associated XIB) gives me this:

enter image description here

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