Differentiate between function overloading and function overriding

Function overloading is same name function but different arguments. Function over riding means same name function and same as arguments

Json.NET serialize object with root name

Well, you can at least tell Json.NET to include the type name: http://www.newtonsoft.com/json/help/html/T_Newtonsoft_Json_TypeNameHandling.htm . Newtonsoft.Json.JsonSerializer jser = new Newtonsoft.Json.JsonSerializer(); jser.TypeNameHandling = TypeNameHandling.Objects;

The type will be included at the beginning in the "$type" property of the object.

This is not exactly what you are looking for, but it was good enough for me when facing a similiar problem.

How to make an introduction page with Doxygen

Have a look at the mainpage command.

Also, have a look this answer to another thread: How to include custom files in Doxygen. It states that there are three extensions which doxygen classes as additional documentation files: .dox, .txt and .doc. Files with these extensions do not appear in the file index but can be used to include additional information into your final documentation - very useful for documentation that is necessary but that is not really appropriate to include with your source code (for example, an FAQ)

So I would recommend having a mainpage.dox (or similarly named) file in your project directory to introduce you SDK. Note that inside this file you need to put one or more C/C++ style comment blocks.

HashSet vs LinkedHashSet

If you take a look at the constructors called from the LinkedHashSet class you will see that internally it's a LinkedHashMap that is used for backing purpose.

Disable Scrolling on Body

HTML css works fine if body tag does nothing you can write as well

<body scroll="no" style="overflow: hidden">

In this case overriding should be on the body tag, it is easier to control but sometimes gives headaches.

Comparing two .jar files

Here's an aparently free tool http://www.extradata.com/products/jarc/

How to include a child object's child object in Entity Framework 5

With EF Core in .NET Core you can use the keyword ThenInclude :

return DatabaseContext.Applications
 .Include(a => a.Children).ThenInclude(c => c.ChildRelationshipType);

Include childs from childrens collection :

return DatabaseContext.Applications
 .Include(a => a.Childrens).ThenInclude(cs => cs.ChildRelationshipType1)
 .Include(a => a.Childrens).ThenInclude(cs => cs.ChildRelationshipType2);

Matplotlib plots: removing axis, legends and white spaces

Custom format for time command

Use the bash built-in variable SECONDS. Each time you reference the variable it will return the elapsed time since the script invocation.

Example:

echo "Start $SECONDS"
sleep 10
echo "Middle $SECONDS"
sleep 10
echo "End $SECONDS"

Output:

Start 0
Middle 10
End 20

Bloomberg Open API

The API's will provide full access to LIVE data, and developers can thus provide applications and develop against the API without paying licencing fees. Consumers will pay for any data received from the apps provided by third party developers, and so BB will grow their audience and revenue in that way.

NOTE: Bloomberg is offering this programming interface (BLPAPI) under a free-use license. This license does not include nor provide access to any Bloomberg data or content.

~~Source: http://www.openbloomberg.com/open-api/~~

Input size vs width

HTML controls the semantic meaning of the elements. CSS controls the layout/style of the page. Use CSS when you are controlling your layout.

In short, never use size=""

Intercept and override HTTP requests from WebView

It looks like API level 11 has support for what you need. See WebViewClient.shouldInterceptRequest().

Can I run Keras model on gpu?

Sure. I suppose that you have already installed TensorFlow for GPU.

You need to add the following block after importing keras. I am working on a machine which have 56 core cpu, and a gpu.

import keras
import tensorflow as tf


config = tf.ConfigProto( device_count = {'GPU': 1 , 'CPU': 56} ) 
sess = tf.Session(config=config) 
keras.backend.set_session(sess)

Of course, this usage enforces my machines maximum limits. You can decrease cpu and gpu consumption values.

How to fix a locale setting warning from Perl

For Debian users, I have this problem after modifying my locale to change machine's language. This is what I did:

Modify .bashrc:

export LANG=fr_FR.UTF-8
export LC_ALL=fr_FR.UTF-8

Uncomment line fr_FR.UTF-8 in file etc/locale.gen -> sudo locale-gen to generate the missing package
sudo update-locale
sudo dpkg-reconfigure locales to configure my locale to fr_FR.UTF-8

Add extra lines to the etc/default/locale file:

LANGUAGE=en_US.UTF-8
LC_ALL=en_US.UTF-8
LANG=en_US.UTF-8
LC_TYPE=en_US.UTF-8

Reboot my computer and everything works fine

What are Aggregates and PODs and how/why are they special?

What changes in c++20

Following the rest of the clear theme of this question, the meaning and use of aggregates continues to change with every standard. There are several key changes on the horizon.

Types with user-declared constructors P1008

In C++17, this type is still an aggregate:

struct X {
    X() = delete;
};

And hence, X{} still compiles because that is aggregate initialization - not a constructor invocation. See also: When is a private constructor not a private constructor?

In C++20, the restriction will change from requiring:

no user-provided, explicit, or inherited constructors

no user-declared or inherited constructors

This has been adopted into the C++20 working draft. Neither the X here nor the C in the linked question will be aggregates in C++20.

This also makes for a yo-yo effect with the following example:

class A { protected: A() { }; };
struct B : A { B() = default; };
auto x = B{};

In C++11/14, B was not an aggregate due to the base class, so B{} performs value-initialization which calls B::B() which calls A::A(), at a point where it is accessible. This was well-formed.

In C++17, B became an aggregate because base classes were allowed, which made B{} aggregate-initialization. This requires copy-list-initializing an A from {}, but from outside the context of B, where it is not accessible. In C++17, this is ill-formed (auto x = B(); would be fine though).

In C++20 now, because of the above rule change, B once again ceases to be an aggregate (not because of the base class, but because of the user-declared default constructor - even though it's defaulted). So we're back to going through B's constructor, and this snippet becomes well-formed.

Initializing aggregates from a parenthesized list of values P960

A common issue that comes up is wanting to use emplace()-style constructors with aggregates:

struct X { int a, b; };
std::vector<X> xs;
xs.emplace_back(1, 2); // error

This does not work, because emplace will try to effectively perform the initialization X(1, 2), which is not valid. The typical solution is to add a constructor to X, but with this proposal (currently working its way through Core), aggregates will effectively have synthesized constructors which do the right thing - and behave like regular constructors. The above code will compile as-is in C++20.

Class Template Argument Deduction (CTAD) for Aggregates P1021 (specifically P1816)

In C++17, this does not compile:

template <typename T>
struct Point {
    T x, y;
};

Point p{1, 2}; // error

Users would have to write their own deduction guide for all aggregate templates:

template <typename T> Point(T, T) -> Point<T>;

But as this is in some sense "the obvious thing" to do, and is basically just boilerplate, the language will do this for you. This example will compile in C++20 (without the need for the user-provided deduction guide).

TextView Marquee not working

I'm working with minSDK=14 and was curious what set of these variations would work. I ended up with:

android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
android:singleLine="true"

in addition to other formatting stuff. I didn't need scrollHoriontally, focusable, or focusableInTouchMode.

This set did require a call to

setSelected(true)

What I find interesting is that singleLine has allegedly been deprecated, with a recommendation to replace it with maxLines = 1. Except - when I do that, that change alone stops the text from scrolling. One would hope that when singleLine eventually bites the dust, that all its current behavior will be triggered by maxLines...

ERROR in ./node_modules/css-loader?

you have to update your node.js and angular/cli.If you update these two things then your project has angular.json file instead of angular-cli.json file.Then add css file into angular.json file.If you add css file into angular-cli.json file instead of angular.json file,then errors are occured.

Select where count of one field is greater than one

SELECT username, numb from(
Select username, count(username) as numb from customers GROUP BY username ) as my_table
WHERE numb > 3

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

INSERT INTO exampleTbl VALUES('he doesn''t work for me')

If you're adding a record through ASP.NET, you can use the SqlParameter object to pass in values so you don't have to worry about the apostrophe's that users enter in.

Drop rows with all zeros in pandas data frame

import pandas as pd

df = pd.DataFrame({'a' : [0,0,1], 'b' : [0,0,-1]})

temp = df.abs().sum(axis=1) == 0      
df = df.drop(temp)

Result:

>>> df
   a  b
2  1 -1

PostgreSQL: how to convert from Unix epoch to date?

The solution above not working for the latest version on PostgreSQL. I found this way to convert epoch time being stored in number and int column type is on PostgreSQL 13:

SELECT TIMESTAMP 'epoch' + (<table>.field::int) * INTERVAL '1 second' as started_on from <table>;

For more detail explanation, you can see here https://www.yodiw.com/convert-epoch-time-to-timestamp-in-postgresql/#more-214

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

  nav = ( NavigationView ) findViewById( R.id.navigation );

    if( nav != null ){
        LinearLayout mParent = ( LinearLayout ) nav.getHeaderView( 0 );

        if( mParent != null ){
            // Set your values to the image and text view by declaring and setting as you need to here.

            SharedPreferences prefs = getSharedPreferences("user_data", MODE_PRIVATE);
            String photoUrl = prefs.getString("photo_url", null);
            String user_name = prefs.getString("name", "User");

            if(photoUrl!=null) {
                Log.e("Photo Url: ", photoUrl);

                TextView userName = mParent.findViewById(R.id.user_name);
                userName.setText(user_name);

                ImageView user_imageView = mParent.findViewById(R.id.avatar);

                RequestOptions requestOptions = new RequestOptions();
                requestOptions.placeholder(R.drawable.ic_user_24dp);
                requestOptions.error(R.drawable.ic_user_24dp);

                Glide.with(this).load(photoUrl)
                        .apply(requestOptions).thumbnail(0.5f).into(user_imageView);

            }

        }
    }

Hope this helps.

CSS background-size: cover replacement for Mobile Safari

For Safari versions <5.1 the css3 property background-size doesn't work. In such cases you need webkit.

So you need to use -webkit-background-size attribute to specify the background-size.

Hence use -webkit-background-size:cover.

Reference-Safari versions using webkit

Append text using StreamWriter

Also look at log4net, which makes logging to 1 or more event stores — whether it's the console, the Windows event log, a text file, a network pipe, a SQL database, etc. — pretty trivial. You can even filter stuff in its configuration, for instance, so that only log records of a particular severity (say ERROR or FATAL) from a single component or assembly are directed to a particular event store.

http://logging.apache.org/log4net/

What does it mean when an HTTP request returns status code 0?

As detailed by this answer on this page, a status code of 0 means the request failed for some reason, and a javascript library interpreted the fail as a status code of 0.

To test this you can do either of the following:

1) Use this chrome extension, Requestly to redirect your url from the https version of your url to the http version, as this will cause a mixed content security error, and ultimately generate a status code of 0. The advantage of this approach is that you don't have to change your app at all, and you can simply "rewrite" your url using this extension.

2) Change the code of your app to optionally make your endpoint redirect to the http version of your url instead of the https version (or vice versa). If you do this, the request will fail with status code 0.

How can I start pagenumbers, where the first section occurs in LaTex?

You can also reset page number counter:

\setcounter{page}{1}

However, with this technique you get wrong page numbers in Acrobat in the top left page numbers field:

\maketitle: 1
\tableofcontents: 2
\setcounter{page}{1}
\section{Introduction}: 1
...

How to export data to CSV in PowerShell?

You can always use the

echo "Column1`tColumn2`tColumn3..." >> results.csv

You will need to put "`t" between the columns to separates the variables into their own column. Here is the way I wrote my script:

echo "Host`tState" >> results.csv
$names = Get-Content "hostlist.txt"
foreach ($name in $names) {
    $count = 0
    $count2 = 13490

    if ( Test-Connection -ComputerName $name -Count 1 -ErrorAction SilentlyContinue ) {
        echo "$name`tUp" >> results.csv
    }
    else {
        echo "$name`tDown" >> results.csv
    }

    $count++
    Write-Progress -Activity "Gathering Information" -status "Pinging Hosts..." -percentComplete ($count / $count2 *100)

}

This is the easiest way to me. The output I get is :

Host|State
----------
H1  |Up
H2  |UP
H3  |Down

You can play around with the look, but that's the basic idea. The $count is just a progress bar if you want to spice up the look

Graph implementation C++

The most common representations are probably these two:

Of these two the adjacency matrix is the simplest, as long as you don't mind having a (possibly huge) n * n array, where n is the number of vertices. Depending on the base type of the array, you can even store edge weights for use in e.g. shortest path discovery algorithms.

File Upload to HTTP server in iphone programming

I thought I would add some server side php code to this answer for any beginners that read this post and are struggling to figure out how to receive the file on the server side and save the file to the filesystem.

I realize that this answer does not directly answer the OP's question, but since Brandon's answer is sufficient for the iOS device side of uploading and he mentions that some knowledge of php is necessary, I thought I would fill in the php gap with this answer.

Here is a class I put together with some sample usage code. Note that the files are stored in directories based on which user is uploading them. This may or may not be applicable to your use, but I thought I'd leave it in place just in case.

<?php


class upload
{
    protected $user;

    protected $isImage;
    protected $isMovie;

    protected $file;
    protected $uploadFilename;
    protected $uploadDirectory;
    protected $fileSize;
    protected $fileTmpName;
    protected $fileType;
    protected $fileExtension;

    protected $saveFilePath;

    protected $allowedExtensions;

function __construct($file, $userPointer)
{
    // set the file we're uploading
    $this->file = $file;

    // if this is tied to a user, link the user account here
    $this->user = $userPointer;

    // set default bool values to false since we don't know what file type is being uploaded yet
    $this->isImage   = FALSE;
    $this->isMovie   = FALSE;

    // setup file properties
    if (isset($this->file) && !empty($this->file))
    {   
        $this->uploadFilename   = $this->file['file']['name'];
        $this->fileSize         = $this->file['file']['size'];
        $this->fileTmpName      = $this->file['file']['tmp_name'];
        $this->fileType         = $this->file['file']['type'];
    }
    else
    {
        throw new Exception('Received empty data. No file found to upload.');
    }

    // get the file extension of the file we're trying to upload
    $tmp = explode('.', $this->uploadFilename);
    $this->fileExtension        = strtolower(end($tmp));

}



public function image($postParams)
{
    // set default error alert (or whatever you want to return if error)
    $retVal = array('alert' => '115');

    // set our bool
    $this->isImage = TRUE;

    // set our type limits
    $this->allowedExtensions    = array("png");

    // setup destination directory path (without filename yet)
    $this->uploadDirectory      = DIR_IMG_UPLOADS.$this->user->uid."/photos/";

    // if user is not subscribed they are allowed only one image, clear their folder here
    if ($this->user->isSubscribed() == FALSE)
    {
        $this->clearFolder($this->uploadDirectory);
    }

    // try to upload the file
    $success = $this->startUpload();

    if ($success === TRUE)
    {
        // return the image name (NOTE: this wipes the error alert set above)
        $retVal = array(
                        'imageName' =>  $this->uploadFilename,
                        );
    }

    return $retVal;
}



public function movie($data)
{
    // update php settings to handle larger uploads
    set_time_limit(300);

    // you may need to increase allowed filesize as well if your server is not set with a high enough limit

    // set default return value (error code for upload failed)
    $retVal = array('alert' => '92');

    // set our bool
    $this->isMovie = TRUE;

    // set our allowed movie types
    $this->allowedExtensions = array("mov", "mp4", "mpv", "3gp");

    // setup destination path
    $this->uploadDirectory = DIR_IMG_UPLOADS.$this->user->uid."/movies/";

    // only upload the movie if the user is a subscriber
    if ($this->user->isSubscribed())
    {
        // try to upload the file
        $success = $this->startUpload();

        if ($success === TRUE)
        {
            // file uploaded so set the new retval
            $retVal = array('movieName' => $this->uploadFilename);
        }
    }
    else
    {
        // return an error code so user knows this is a limited access feature
        $retVal = array('alert' => '13');
    }

    return $retVal;
}




//-------------------------------------------------------------------------------
//                          Upload Process Methods
//-------------------------------------------------------------------------------

private function startUpload()
{
    // see if there are any errors
    $this->checkForUploadErrors();

    // validate the type received is correct
    $this->checkFileExtension();

    // check the filesize
    $this->checkFileSize();

    // create the directory for the user if it does not exist
    $this->createUserDirectoryIfNotExists();

    // generate a local file name
    $this->createLocalFileName();

    // verify that the file is an uploaded file
    $this->verifyIsUploadedFile();

    // save the image to the appropriate folder
    $success = $this->saveFileToDisk();

    // return TRUE/FALSE
    return $success;
}

private function checkForUploadErrors()
{
    if ($this->file['file']['error'] != 0)
    {
        throw new Exception($this->file['file']['error']);
    }
}

private function checkFileExtension()
{
    if ($this->isImage)
    {
        // check if we are in fact uploading a png image, if not return error
        if (!(in_array($this->fileExtension, $this->allowedExtensions)) || $this->fileType != 'image/png' || exif_imagetype($this->fileTmpName) != IMAGETYPE_PNG)
        {
            throw new Exception('Unsupported image type. The image must be of type png.');
        }
    }
    else if ($this->isMovie)
    {
        // check if we are in fact uploading an accepted movie type
        if (!(in_array($this->fileExtension, $this->allowedExtensions)) || $this->fileType != 'video/mov')
        {
            throw new Exception('Unsupported movie type. Accepted movie types are .mov, .mp4, .mpv, or .3gp');
        }
    }   
}

private function checkFileSize()
{
    if ($this->isImage)
    {
        if($this->fileSize > TenMB)
        {
            throw new Exception('The image filesize must be under 10MB.');
        }
    }
    else if ($this->isMovie)
    {
        if($this->fileSize > TwentyFiveMB) 
        {
            throw new Exception('The movie filesize must be under 25MB.');
        }
    }
}

private function createUserDirectoryIfNotExists()
{
    if (!file_exists($this->uploadDirectory)) 
    {
        mkdir($this->uploadDirectory, 0755, true);
    }
    else
    {
        if ($this->isMovie)
        {
            // clear any prior uploads from the directory (only one movie file per user)
            $this->clearFolder($this->uploadDirectory);
        }
    }
}

private function createLocalFileName()
{
    $now = time();

    // try to create a unique filename for this users file
    while(file_exists($this->uploadFilename = $now.'-'.$this->uid.'.'.$this->fileExtension))
    {
        $now++;
    }

    // create our full file save path
    $this->saveFilePath = $this->uploadDirectory.$this->uploadFilename;
}

private function clearFolder($path)
{
    if(is_file($path))
    {
        // if there's already a file with this name clear it first
        return @unlink($path);
    }
    elseif(is_dir($path))
    {
        // if it's a directory, clear it's contents
        $scan = glob(rtrim($path,'/').'/*');
        foreach($scan as $index=>$npath)
        {
            $this->clearFolder($npath);
            @rmdir($npath);
        }
    }
}

private function verifyIsUploadedFile()
{
    if (! is_uploaded_file($this->file['file']['tmp_name']))
    {
        throw new Exception('The file failed to upload.');
    }
}


private function saveFileToDisk()
{
    if (move_uploaded_file($this->file['file']['tmp_name'], $this->saveFilePath))
    {
        return TRUE;     
    }

    throw new Exception('File failed to upload. Please retry.');
}

}


?>

Here's some sample code demonstrating how you might use the upload class...

// get a reference to your user object if applicable
$myUser = $this->someMethodThatFetchesUserWithId($myUserId);

// get reference to file to upload
$myFile = isset($_FILES) ? $_FILES : NULL;

// use try catch to return an error for any exceptions thrown in the upload script
try 
{
    // create and setup upload class
    $upload = new upload($myFile, $myUser);

    // trigger file upload
    $data   = $upload->image();     // if uploading an image
    $data  = $upload->movie();      // if uploading movie

    // return any status messages as json string
    echo json_encode($data);
} 
catch (Exception $exception) 
{
    $retData = array(
            'status'    => 'FALSE',
            'payload'   => array(
                            'errorMsg' => $exception->getMessage()
                            ),
                );

    echo json_encode($retData);
}

How to invert a grep expression

As stated multiple times, inversion is achieved by the -v option to grep. Let me add the (hopefully amusing) note that you could have figured this out yourself by grepping through the grep help text:

grep --help | grep invert

-v, --invert-match select non-matching lines

Datetime current year and month in Python

>>> from datetime import date
>>> date.today().month
2
>>> date.today().year
2020
>>> date.today().day
13

Possible to restore a backup of SQL Server 2014 on SQL Server 2012?

You CANNOT do this - you cannot attach/detach or backup/restore a database from a newer version of SQL Server down to an older version - the internal file structures are just too different to support backwards compatibility. This is still true in SQL Server 2014 - you cannot restore a 2014 backup on anything other than another 2014 box (or something newer).

You can either get around this problem by

using the same version of SQL Server on all your machines - then you can easily backup/restore databases between instances
otherwise you can create the database scripts for both structure (tables, view, stored procedures etc.) and for contents (the actual data contained in the tables) either in SQL Server Management Studio (Tasks > Generate Scripts) or using a third-party tool
or you can use a third-party tool like Red-Gate's SQL Compare and SQL Data Compare to do "diffing" between your source and target, generate update scripts from those differences, and then execute those scripts on the target platform; this works across different SQL Server versions.

The compatibility mode setting just controls what T-SQL features are available to you - which can help to prevent accidentally using new features not available in other servers. But it does NOT change the internal file format for the .mdf files - this is NOT a solution for that particular problem - there is no solution for restoring a backup from a newer version of SQL Server on an older instance.

Python math module

pow is built into the language(not part of the math library). The problem is that you haven't imported math.

Try this:

import math
math.sqrt(4)

Check if list contains element that contains a string and get that element

string result = myList.FirstOrDefault(x => x == myString)
if(result != null)
{
  //found
}

PostgreSQL - fetch the row which has the Max value for a column

Actaully there's a hacky solution for this problem. Let's say you want to select the biggest tree of each forest in a region.

SELECT (array_agg(tree.id ORDER BY tree_size.size)))[1]
FROM tree JOIN forest ON (tree.forest = forest.id)
GROUP BY forest.id

When you group trees by forests there will be an unsorted list of trees and you need to find the biggest one. First thing you should do is to sort the rows by their sizes and select the first one of your list. It may seems inefficient but if you have millions of rows it will be quite faster than the solutions that includes JOIN's and WHERE conditions.

BTW, note that ORDER_BY for array_agg is introduced in Postgresql 9.0

Eclipse won't compile/run java file

right click somewhere on the file or in project explorer and choose 'run as'->'java application'

How can I change a button's color on hover?

a.button:hover{
    background: #383;  }

works for me but in my case

#buttonClick:hover {
background-color:green;  }

To compare two elements(string type) in XSLT?

First of all, the provided long code:

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

is equivalent to this, much shorter code:

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

Now, to your question:

how to compare two elements coming from xml as string

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

$str1 = $str2

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

not($str1 = $str2)

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

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

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

$el1 = $el2

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

not($el1 = $el2)

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

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

 $ns = $str

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

$ns1 = $ns2

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

Therefore, the expression:

OU_NAME='OU_ADDR1'

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

This is obviously not what you want!

Most probably you want:

OU_NAME=OU_ADDR1

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

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

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

jQuery autoComplete view all on click?

I needed to do this recently and after trying a few different permutations (using onfocus, onclick of textbox etc), I finally settled on this...

 <input id="autocomplete" name="autocomplete" type="text" 
 value="Choose Document">

 <p>
 <button type="submit" value="Submit" name="submit" id="submit" >
  Submit
 </button>
 </p>

<script type="text/javascript">

$("#autocomplete").autocomplete(
{
source: '@Url.Content("~/Document/DocumentTypeAutoComplete/")' //<--ddl source
, minLength: 0 // <-- This is necessary to get the search going on blank input
, delay: 0
, select: function (event, ui) 
  {
  if (ui.item) {
     $("#autocomplete").val(ui.item.value);//<-- Place selection in the textbox
          $("docForm").submit(); 
          loadDocTypeCreatePartial(ui.item);
          $("#submit").focus(); //This stops the drop down list from reopening 
                                // after an item in the select box is chosen
                                // You can place the focus anywhere you'd like,
                                // I just chose my *submit* button
                }
   }
  }).focus(function () {
    // following line will autoselect textbox text
    // making it easier for the user to overwrite whats in the 
    // textbox
    $(this).select();

    //The below line triggers the search function on an empty string
    $(this).data("autocomplete").search('');
   });
 </script>

This opens the autocomplete ddl list on focus (Even if you have default text in your input box like I do above).

It also auto-selects the text in the text box to prevent the user from having to clear out the text.

Once an item is selected from the auto-complete list, it puts that item into the auto-complete input box and moves the focus to another control (thus preventing the auto-complete from reopening).

I plan on replacing it by adding dynamic Ajax calls to the very nice Chosen select lists with the Melting Ice upgrade when I get a chance.

Converting an OpenCV Image to Black and White

Specifying CV_THRESH_OTSU causes the threshold value to be ignored. From the documentation:

Also, the special value THRESH_OTSU may be combined with one of the above values. In this case, the function determines the optimal threshold value using the Otsu’s algorithm and uses it instead of the specified thresh . The function returns the computed threshold value. Currently, the Otsu’s method is implemented only for 8-bit images.

This code reads frames from the camera and performs the binary threshold at the value 20.

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace cv;

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

    VideoCapture cap; 
    if(argc > 1) 
        cap.open(string(argv[1])); 
    else 
        cap.open(0); 
    Mat frame; 
    namedWindow("video", 1); 
    for(;;) {
        cap >> frame; 
        if(!frame.data) 
            break; 
        cvtColor(frame, frame, CV_BGR2GRAY);
        threshold(frame, frame, 20, 255, THRESH_BINARY);
        imshow("video", frame); 
        if(waitKey(30) >= 0) 
            break;
    }

    return 0;
}

Get all column names of a DataTable into string array using (LINQ/Predicate)

Use

var arrayNames = (from DataColumn x in dt.Columns
                  select x.ColumnName).ToArray();

How can I take a screenshot with Selenium WebDriver?

File scrFile = ((TakesScreenshot) driver).getScreenshotAs(OutputType.FILE);
BufferedImage originalImage = ImageIO.read(scrFile);
//int type = originalImage.getType() == 0 ? BufferedImage.TYPE_INT_ARGB : originalImage.getType();
BufferedImage resizedImage = CommonUtilities.resizeImage(originalImage, IMG_HEIGHT, IMG_WIDTH);
ImageIO.write(resizedImage, "jpg", new File(path + "/"+ testCaseId + "/img/" + index + ".jpg"));
Image jpeg = Image.getInstance(path + "/" + testCaseId + "/img/"+ index + ".jpg");

Bootstrap 4 img-circle class not working

It's now called rounded-circle as explained here in the BS4 docs

<img src="img/gallery2.JPG" class="rounded-circle">

Demo

What is compiler, linker, loader?

Compiler It converts the source code into the object code.

Linker It combines the multiple object files into a single executable program file.

Loader It loads the executable file into main memory.

"A lambda expression with a statement body cannot be converted to an expression tree"

9 years too late to the party, but a different approach to your problem (that nobody has mentioned?):

The statement-body works fine with Func<> but won't work with Expression<Func<>>. IQueryable.Select wants an Expression<>, because they can be translated for Entity Framework - Func<> can not.

So you either use the AsEnumerable and start working with the data in memory (not recommended, if not really neccessary) or you keep working with the IQueryable<> which is recommended. There is something called linq query which makes some things easier:

IQueryable<Obj> result = from o in objects
                         let someLocalVar = o.someVar
                         select new Obj
                         {
                           Var1 = someLocalVar,
                           Var2 = o.var2
                         };

with let you can define a variable and use it in the select (or where,...) - and you keep working with the IQueryable until you really need to execute and get the objects.

Afterwards you can Obj[] myArray = result.ToArray()

string in namespace std does not name a type

You need to add:

#include <string>

In your header file.

Understanding React-Redux and mapStateToProps()

I would like to re-structure the statement that you mentioned which is:

This means that the state as consumed by your target component can have a wildly different structure from the state as it is stored on your store

You can say that the state consumed by your target component has a small portion of the state that is stored on the redux store. In other words, the state consumed by your component would be the sub-set of the state of the redux store.

As far as understanding the connect() method is concerned, it's fairly simple! connect() method has the power to add new props to your component and even override existing props. It is through this connect method that we can access the state of the redux store as well which is thrown to us by the Provider. A combination of which works in your favor and you get to add the state of your redux store to the props of your component.

Above is some theory and I would suggest you look at this video once to understand the syntax better.

How to get the current date and time

Just construct a new Date object without any arguments; this will assign the current date and time to the new object.

import java.util.Date;

Date d = new Date();

In the words of the Javadocs for the zero-argument constructor:

Allocates a Date object and initializes it so that it represents the time at which it was allocated, measured to the nearest millisecond.

Make sure you're using java.util.Date and not java.sql.Date -- the latter doesn't have a zero-arg constructor, and has somewhat different semantics that are the topic of an entirely different conversation. :)

SQL: How to perform string does not equal

Your where clause will return all rows where tester does not match username AND where tester is not null.

If you want to include NULLs, try:

where tester <> 'username' or tester is null

If you are looking for strings that do not contain the word "username" as a substring, then like can be used:

where tester not like '%username%'

Command line input in Python

It is not at all clear what the OP meant (even after some back-and-forth in the comments), but here are two answers to possible interpretations of the question:

For interactive user input (or piped commands or redirected input)

Use raw_input in Python 2.x, and input in Python 3. (These are built in, so you don't need to import anything to use them; you just have to use the right one for your version of python.)

For example:

user_input = raw_input("Some input please: ")

More details can be found here.

So, for example, you might have a script that looks like this

# First, do some work, to show -- as requested -- that
# the user input doesn't need to come first.
from __future__ import print_function
var1 = 'tok'
var2 = 'tik'+var1
print(var1, var2)

# Now ask for input
user_input = raw_input("Some input please: ") # or `input("Some...` in python 3

# Now do something with the above
print(user_input)

If you saved this in foo.py, you could just call the script from the command line, it would print out tok tiktok, then ask you for input. You could enter bar baz (followed by the enter key) and it would print bar baz. Here's what that would look like:

$ python foo.py
tok tiktok
Some input please: bar baz
bar baz

Here, $ represents the command-line prompt (so you don't actually type that), and I hit Enter after typing bar baz when it asked for input.

For command-line arguments

Suppose you have a script named foo.py and want to call it with arguments bar and baz from the command line like

$ foo.py bar baz

(Again, $ represents the command-line prompt.) Then, you can do that with the following in your script:

import sys
arg1 = sys.argv[1]
arg2 = sys.argv[2]

Here, the variable arg1 will contain the string 'bar', and arg2 will contain 'baz'. The object sys.argv is just a list containing everything from the command line. Note that sys.argv[0] is the name of the script. And if, for example, you just want a single list of all the arguments, you would use sys.argv[1:].

Update query with PDO and MySQL

This has nothing to do with using PDO, it's just that you are confusing INSERT and UPDATE.

Here's the difference:

INSERT creates a new row. I'm guessing that you really want to create a new row.
UPDATE changes the values in an existing row, but if this is what you're doing you probably should use a WHERE clause to restrict the change to a specific row, because the default is that it applies to every row.

So this will probably do what you want:

$sql = "INSERT INTO `access_users`   
  (`contact_first_name`,`contact_surname`,`contact_email`,`telephone`) 
  VALUES (:firstname, :surname, :email, :telephone);
  ";

Note that I've also changed the order of columns; the order of your columns must match the order of values in your VALUES clause.

MySQL also supports an alternative syntax for INSERT:

$sql = "INSERT INTO `access_users`   
  SET `contact_first_name` = :firstname,
    `contact_surname` = :surname,
    `contact_email` = :email,
    `telephone` = :telephone
  ";

This alternative syntax looks a bit more like an UPDATE statement, but it creates a new row like INSERT. The advantage is that it's easier to match up the columns to the correct parameters.

Add URL link in CSS Background Image?

Using only CSS it is not possible at all to add links :) It is not possible to link a background-image, nor a part of it, using HTML/CSS. However, it can be staged using this method:

<div class="wrapWithBackgroundImage">
    <a href="#" class="invisibleLink"></a>
</div>

.wrapWithBackgroundImage {
    background-image: url(...);
}
.invisibleLink {
    display: block;
    left: 55px; top: 55px;
    position: absolute;
    height: 55px width: 55px;
}

What is Haskell used for in the real world?

Haskell is a general purpose programming language. It can be used for anything you use any other language to do. You aren't limited by anything but your own imagination. As for what it's suited for? Well, pretty much everything. There are few tasks in which a functional language does not excel.

And yes, I'm the Rayne from Dreamincode. :)

I would also like to mention that, in case you haven't read the Wikipedia page, functional programming is a paradigm like Object Oriented programming is a paradigm. Just in case you didn't know. Haskell is also functional in the sense that it works; it works quite well at that.

Just because a language isn't an Object Oriented language doesn't mean the language is limited by anything. Haskell is a general-purpose programming language, and is just as general purpose as Java.

MySQL add days to a date

SET date = DATE_ADD( fieldname, INTERVAL 2 DAY )

Set up adb on Mac OS X

NOTE: Path for adb has changed since Android Studio 1.0.xx

For bash shell, use:

echo 'export PATH=$PATH:'$HOME'/Library/Android/sdk/platform-tools' >> ~/.bash_profile

For tcsh shell, use:

echo 'setenv PATH $PATH\:'$HOME'/Library/Android/sdk/platform-tools' >> ~/.tcshrc

Maven parent pom vs modules pom

From my experience and Maven best practices there are two kinds of "parent poms"

"company" parent pom - this pom contains your company specific information and configuration that inherit every pom and doesn't need to be copied. These informations are:
- repositories
- distribution managment sections
- common plugins configurations (like maven-compiler-plugin source and target versions)
- organization, developers, etc
Preparing this parent pom need to be done with caution, because all your company poms will inherit from it, so this pom have to be mature and stable (releasing a version of parent pom should not affect to release all your company projects!)
second kind of parent pom is a multimodule parent. I prefer your first solution - this is a default maven convention for multi module projects, very often represents VCS code structure

The intention is to be scalable to a large scale build so should be scalable to a large number of projects and artifacts.

Mutliprojects have structure of trees - so you aren't arrown down to one level of parent pom. Try to find a suitable project struture for your needs - a classic exmample is how to disrtibute mutimodule projects

distibution/
documentation/
myproject/
  myproject-core/
  myproject-api/
  myproject-app/
  pom.xml
pom.xml

A few bonus questions:

Where is the best place to define the various shared configuration as in source control, deployment directories, common plugins etc. (I'm assuming the parent but I've often been bitten by this and they've ended up in each project rather than a common one).

This configuration has to be wisely splitted into a "company" parent pom and project parent pom(s). Things related to all you project go to "company" parent and this related to current project go to project one's.

How do the maven-release plugin, hudson and nexus deal with how you set up your multi-projects (possibly a giant question, it's more if anyone has been caught out when by how a multi-project build has been set up)?

Company parent pom have to be released first. For multiprojects standard rules applies. CI server need to know all to build the project correctly.

jQuery change event on dropdown

Please change your javascript function as like below....

$(function () {
        $("#projectKey").change(function () {
            alert($('option:selected').text());
        });
    });

You do not need to use $(this) in alert.

How to create a custom-shaped bitmap marker with Android map API v2

From lambda answer, I have made something closer to the requirements.

boolean imageCreated = false;

Bitmap bmp = null;
Marker currentLocationMarker;
private void doSomeCustomizationForMarker(LatLng currentLocation) {
    if (!imageCreated) {
        imageCreated = true;
        Bitmap.Config conf = Bitmap.Config.ARGB_8888;
        bmp = Bitmap.createBitmap(400, 400, conf);
        Canvas canvas1 = new Canvas(bmp);

        Paint color = new Paint();
        color.setTextSize(30);
        color.setColor(Color.WHITE);

        BitmapFactory.Options opt = new BitmapFactory.Options();
        opt.inMutable = true;

        Bitmap imageBitmap=BitmapFactory.decodeResource(getResources(),
                R.drawable.messi,opt);
        Bitmap resized = Bitmap.createScaledBitmap(imageBitmap, 320, 320, true);
        canvas1.drawBitmap(resized, 40, 40, color);

        canvas1.drawText("Le Messi", 30, 40, color);

        currentLocationMarker = mMap.addMarker(new MarkerOptions().position(currentLocation)
                .icon(BitmapDescriptorFactory.fromBitmap(bmp))
                // Specifies the anchor to be at a particular point in the marker image.
                .anchor(0.5f, 1));
    } else {
        currentLocationMarker.setPosition(currentLocation);
    }

}

Auto-increment on partial primary key with Entity Framework Core

Well those Data Annotations should do the trick, maybe is something related with the PostgreSQL Provider.

From EF Core documentation:

Depending on the database provider being used, values may be generated client side by EF or in the database. If the value is generated by the database, then EF may assign a temporary value when you add the entity to the context. This temporary value will then be replaced by the database generated value during SaveChanges.

You could also try with this Fluent Api configuration:

modelBuilder.Entity<Foo>()
            .Property(f => f.Id)
            .ValueGeneratedOnAdd();

But as I said earlier, I think this is something related with the DB provider. Try to add a new row to your DB and check later if was generated a value to the Id column.

How to check if object (variable) is defined in R?

javax.naming.NameNotFoundException

I am getting the error (...) javax.naming.NameNotFoundException: greetJndi not bound

This means that nothing is bound to the jndi name greetJndi, very likely because of a deployment problem given the incredibly low quality of this tutorial (check the server logs). I'll come back on this.

Is there any specific directory structure to deploy in JBoss?

The internal structure of the ejb-jar is supposed to be like this (using the poor naming conventions and the default package as in the mentioned link):

.
+-- greetBean.java
+-- greetHome.java
+-- greetRemote.java
+-- META-INF
    +-- ejb-jar.xml
    +-- jboss.xml

But as already mentioned, this tutorial is full of mistakes:

there is an extra character (<enterprise-beans>] <-- HERE) in the ejb-jar.xml (!)
a space is missing after PUBLIC in the ejb-jar.xml and jboss.xml (!!)
the jboss.xml is incorrect, it should contain a session element instead of entity (!!!)

Here is a "fixed" version of the ejb-jar.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
  <enterprise-beans>
    <session>
      <ejb-name>greetBean</ejb-name>
      <home>greetHome</home>
      <remote>greetRemote</remote>
      <ejb-class>greetBean</ejb-class>
      <session-type>Stateless</session-type>
      <transaction-type>Container</transaction-type>
    </session>
  </enterprise-beans>
</ejb-jar>

And of the jboss.xml:

<?xml version="1.0"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 3.2//EN" "http://www.jboss.org/j2ee/dtd/jboss_3_2.dtd">
<jboss>
  <enterprise-beans>
    <session>
      <ejb-name>greetBean</ejb-name>
      <jndi-name>greetJndi</jndi-name>
    </session>
  </enterprise-beans>
</jboss>

After doing these changes and repackaging the ejb-jar, I was able to successfully deploy it:

21:48:06,512 INFO  [Ejb3DependenciesDeployer] Encountered deployment AbstractVFSDeploymentContext@5060868{vfszip:/home/pascal/opt/jboss-5.1.0.GA/server/default/deploy/greet.jar/}
21:48:06,534 INFO  [EjbDeployer] installing bean: ejb/#greetBean,uid19981448
21:48:06,534 INFO  [EjbDeployer]   with dependencies:
21:48:06,534 INFO  [EjbDeployer]   and supplies:
21:48:06,534 INFO  [EjbDeployer]    jndi:greetJndi
21:48:06,624 INFO  [EjbModule] Deploying greetBean
21:48:06,661 WARN  [EjbModule] EJB configured to bypass security. Please verify if this is intended. Bean=greetBean Deployment=vfszip:/home/pascal/opt/jboss-5.1.0.GA/server/default/deploy/greet.jar/
21:48:06,805 INFO  [ProxyFactory] Bound EJB Home 'greetBean' to jndi 'greetJndi'

That tutorial needs significant improvement; I'd advise from staying away from roseindia.net.

how to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript or jQuery

You might want to use helper library like http://momentjs.com/ which wraps the native javascript date object for easier manipulations

Then you can do things like:

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

var day = moment("25/12/1995", "DD/MM/YYYY");

then operate on the date

day.add('days', 7)

and to get the native javascript date

day.toDate();

How to handle login pop up window using Selenium WebDriver?

My usecase is:

Navigate to webapp.
Webapp detects I am not logged in, and redirects to an SSO site - different server!
SSO site (maybe on Jenkins) detects I am not logged into AD, and shows a login popup.
After you enter credentials, you are redirected back to webapp.

I am on later versions of Selenium 3, and the login popup is not detected with driver.switchTo().alert(); - results in NoAlertPresentException.

Just providing username:password in the URL is not propagated from step 1 to 2 above.

My workaround:

import org.apache.http.client.utils.URIBuilder;

driver.get(...webapp_location...);
wait.until(ExpectedConditions.urlContains(...sso_server...));

URIBuilder uri = null;
try {
    uri = new URIBuilder(driver.getCurrentUrl());
} catch (URISyntaxException ex) {
    ex.printStackTrace();
}
uri.setUserInfo(username, password);
driver.navigate().to(uri.toString());

Disable HTTP OPTIONS, TRACE, HEAD, COPY and UNLOCK methods in IIS

Finaly I found another answer for this problem. and this is working for me. Just add below datas to the your webconfig file.

<configuration>
 <system.webServer>
  <security>
   <requestFiltering>
    <verbs allowUnlisted="true">
     <add verb="OPTIONS" allowed="false" />
    </verbs>
   </requestFiltering>
  </security>
 </system.webServer>
</configuration>

Form more information, you can visit this web site: http://www.iis.net/learn/manage/configuring-security/use-request-filtering

if you want to test your web site, is it working or not... You can use "HttpRequester" mozilla firefox plugin. for this plugin: https://addons.mozilla.org/En-us/firefox/addon/httprequester/

MySQL Delete all rows from table and reset ID to zero

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

ALTER TABLE mytable AUTO_INCREMENT = 1

How Do I Take a Screen Shot of a UIView?

iOS7 onwards, we have below default methods :

- (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates

Calling above method is faster than trying to render the contents of the current view into a bitmap image yourself.

If you want to apply a graphical effect, such as blur, to a snapshot, use the drawViewHierarchyInRect:afterScreenUpdates: method instead.

https://developer.apple.com/library/ios/documentation/uikit/reference/uiview_class/uiview/uiview.html

How to create a zip archive with PowerShell?

A pure PowerShell alternative that works with PowerShell 3 and .NET 4.5 (if you can use it):

function ZipFiles( $zipfilename, $sourcedir )
{
   Add-Type -Assembly System.IO.Compression.FileSystem
   $compressionLevel = [System.IO.Compression.CompressionLevel]::Optimal
   [System.IO.Compression.ZipFile]::CreateFromDirectory($sourcedir,
        $zipfilename, $compressionLevel, $false)
}

Just pass in the full path to the zip archive you would like to create and the full path to the directory containing the files you would like to zip.

How to add an element to a list?

import json

myDict = {'dict': [{'a': 'none', 'b': 'none', 'c': 'none'}]}
test = json.dumps(myDict)
print(test)

{"dict": [{"a": "none", "b": "none", "c": "none"}]}

myDict['dict'].append(({'a': 'aaaa', 'b': 'aaaa', 'c': 'aaaa'}))
test = json.dumps(myDict)
print(test)

{"dict": [{"a": "none", "b": "none", "c": "none"}, {"a": "aaaa", "b": "aaaa", "c": "aaaa"}]}

Adding external library in Android studio

Three ways in android studio for adding a external library.

if you want to add libarary project dependency in your project :

A. In file menu click new and choose import module choose your library project path and click ok, library project automatically add in your android studio project .

B. Now open your main module(like app) gradle file and add project dependency in dependency section dependencies {

compile project(':library project name')
if you want to add jar file : A. add jar file in libs folder. B. And Add dependency

compile fileTree(dir: 'libs', include: '*.jar') // add all jar file from libs folder, if you want to add particular jar from libs add below dependency.

compile files('libs/abc.jar')
Add Dependency from url (recommended). like

compile 'com.mcxiaoke.volley:library-aar:1.0.0'

How can I install MacVim on OS X?

Step 1. Install homebrew from here: http://brew.sh
Step 1.1. Run export PATH=/usr/local/bin:$PATH
Step 2. Run brew update
Step 3. Run brew install vim && brew install macvim
Step 4. Run brew link macvim

You now have the latest versions of vim and macvim managed by brew. Run brew update && brew upgrade every once in a while to upgrade them.

This includes the installation of the CLI mvim and the mac application (which both point to the same thing).

I use this setup and it works like a charm. Brew even takes care of installing vim with the preferable options.

Pretty graphs and charts in Python

PLplot is a cross-platform software package for creating scientific plots. They aren't very pretty (eye catching), but they look good enough. Have a look at some examples (both source code and pictures).

The PLplot core library can be used to create standard x-y plots, semi-log plots, log-log plots, contour plots, 3D surface plots, mesh plots, bar charts and pie charts. It runs on Windows (2000, XP and Vista), Linux, Mac OS X, and other Unices.

Spring configure @ResponseBody JSON format

I needeed to solve very similar problem, which is configuring Jackson Mapper to "Do not serialize null values for Christ's sake!!!".

I didn't want to leave fancy mvc:annotation-driven tag, so I found, how to configure Jackson's ObjectMapper without removing mvc:annotation-driven and adding not really fancy ContentNegotiatingViewResolver.

The beautiful thing is that you don't have to write any Java code yourself!

And here is the XML configuration (don't be confused with different namespaces of Jackson classes, I simply used new Jakson 2.x library ... the same should also work with Jackson 1.x libraries):

<mvc:annotation-driven>
    <mvc:message-converters register-defaults="true">
        <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
            <property name="objectMapper">
                <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                    <property name="serializationInclusion">
                        <value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
                    </property>
                </bean>
            </property>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

MassAssignmentException in Laravel

I used this and have no problem:

protected $guarded=[];

Inserting a text where cursor is using Javascript/jquery

This jQuery plugin gives you a pre-made way of selection/caret manipulation.

How do I download a file from the internet to my linux server with Bash

Using wget

wget -O /tmp/myfile 'http://www.google.com/logo.jpg'

or curl:

curl -o /tmp/myfile 'http://www.google.com/logo.jpg'

How do I get Maven to use the correct repositories?

I think what you have missed here is this:

https://maven.apache.org/settings.html#Servers

The repositories for download and deployment are defined by the repositories and distributionManagement elements of the POM. However, certain settings such as username and password should not be distributed along with the pom.xml. This type of information should exist on the build server in the settings.xml.

This is the prefered way of using custom repos. So probably what is happening is that the url of this repo is in settings.xml of the build server.

Once you get hold of the url and credentials, you can put them in your machine here: ~/.m2/settings.xml like this:

<settings ...> 

        .
        .
        .
        <servers>
            <server>
              <id>internal-repository-group</id>
              <username>YOUR-USERNAME-HERE</username>
              <password>YOUR-PASSWORD-HERE</password>
            </server>
        </servers>
</settings>

EDIT:

You then need to refer this repository into project POM. The id internal-repository-group can be used in every project. You can setup multiple repos and credentials setting using different IDs in settings xml.

The advantage of this approach is that project can be shared without worrying about the credentials and don't have to mention the credentials in every project.

Following is a sample pom of a project using "internal-repository-group"

<repositories>
    <repository>
        <id>internal-repository-group</id>
        <name>repo-name</name>
        <url>http://project.com/yourrepourl/</url>
        <layout>default</layout>
        <releases>
            <enabled>true</enabled>
            <updatePolicy>never</updatePolicy>
        </releases>
        <snapshots>
            <enabled>true</enabled>
            <updatePolicy>never</updatePolicy>
        </snapshots>
    </repository>
</repositories>

PostgreSQL - query from bash script as database user 'postgres'

Once you're logged in as postgres, you should be able to write:

psql -t -d database_name -c $'SELECT c_defaults FROM user_info WHERE c_uid = \'testuser\';'

to print out just the value of that field, which means that you can capture it to (for example) save in a Bash variable:

testuser_defaults="$(psql -t -d database_name -c $'SELECT c_defaults FROM user_info WHERE c_uid = \'testuser\';')"

To handle the logging in as postgres, I recommend using sudo. You can give a specific user the permission to run

sudo -u postgres /path/to/this/script.sh

so that they can run just the one script as postgres.

Align an element to bottom with flexbox

Not sure about flexbox but you can do using the position property.

set parent div position: relative and child element which might be an <p> or <h1> etc.. set position: absolute and bottom: 0.

Example:

index.html

<div class="parent">
  <p>Child</p>
</div>

style.css

.parent {
  background: gray;
  width: 10%;
  height: 100px;    
  position: relative;
}
p {
  position: absolute;
  bottom: 0;
}

Code pen here.

How can I submit a form using JavaScript?

<html>

    <body>

        <p>Enter some text in the fields below, and then press the "Submit form" button to submit the form.</p>

        <form id="myForm" action="/action_page.php">
          First name: <input type="text" name="fname"><br>
          Last name: <input type="text" name="lname"><br><br>
          <input type="button" onclick="myFunction()" value="Submit form">
        </form>

        <script>
            function myFunction() {
                document.getElementById("myForm").submit();
            }
        </script>

    </body>
</html>

How To Accept a File POST

I had a similar problem for the preview Web API. Did not port that part to the new MVC 4 Web API yet, but maybe this helps:

REST file upload with HttpRequestMessage or Stream?

Please let me know, can sit down tomorrow and try to implement it again.

ld.exe: cannot open output file ... : Permission denied

If you think the executable is locked by a process, try Process Explorer from SysInternals. In the File/handle, enter Fibonacci.exe and you should see who holds the file.

If it is not enough, you can use Process Monitor (from SysInternals, again) to follow the activity of all processes on your system on Fibonacci.exe. With a little bit of analysis (call stacks), you'll may find out why the access to the file is denied and what make it disappear.

LDAP Authentication using Java

You will have to provide the entire user dn in SECURITY_PRINCIPAL

like this

env.put(Context.SECURITY_PRINCIPAL, "cn=username,ou=testOu,o=test");

How to show all privileges from a user in oracle?

To show all privileges:

select name from system_privilege_map;

Check if a file is executable

This might be not so obvious, but sometime is required to test the executable to appropriately call it without an external shell process:

function tkl_is_file_os_exec()
{
  [[ ! -x "$1" ]] && return 255

  local exec_header_bytes
  case "$OSTYPE" in
    cygwin* | msys* | mingw*)
      # CAUTION:
      #   The bash version 3.2+ might require a file path together with the extension,
      #   otherwise will throw the error: `bash: ...: No such file or directory`.
      #   So we make a guess to avoid the error.
      #
      {
        read -r -n 4 exec_header_bytes 2> /dev/null < "$1" ||
        {
          [[ -x "${1%.exe}.exe" ]] && read -r -n 4 exec_header_bytes 2> /dev/null < "${1%.exe}.exe"
        } ||
        {
          [[ -x "${1%.com}.com" ]] && read -r -n 4 exec_header_bytes 2> /dev/null < "${1%.com}.com"
        }
      } &&
      if [[ "${exec_header_bytes:0:3}" == $'MZ\x90' ]]; then
        # $'MZ\x90\00' for bash version 3.2.42+
        # $'MZ\x90\03' for bash version 4.0+
        [[ "${exec_header_bytes:3:1}" == $'\x00' || "${exec_header_bytes:3:1}" == $'\x03' ]] && return 0
      fi
    ;;
    *)
      read -r -n 4 exec_header_bytes < "$1"
      [[ "$exec_header_bytes" == $'\x7fELF' ]] && return 0
    ;;
  esac

  return 1
}

# executes script in the shell process in case of a shell script, otherwise executes as usual
function tkl_exec_inproc()
{
  if tkl_is_file_os_exec "$1"; then
    "$@"
  else
    . "$@"
  fi
  return $?
}

myscript.sh:

#!/bin/bash

echo 123

return 123

In Cygwin:

> tkl_exec_inproc /cygdrive/c/Windows/system32/cmd.exe /c 'echo 123'
123
> tkl_exec_inproc /cygdrive/c/Windows/system32/chcp.com 65001
Active code page: 65001
> tkl_exec_inproc ./myscript.sh
123
> echo $?
123

In Linux:

> tkl_exec_inproc /bin/bash -c 'echo 123'
123
> tkl_exec_inproc ./myscript.sh
123
> echo $?
123

jQuery hasAttr checking to see if there is an attribute on an element

You can also use it with attributes such as disabled="disabled" on the form fields etc. like so:

$("#change_password").click(function() {
    var target = $(this).attr("rel");
    if($("#" + target).attr("disabled")) {
        $("#" + target).attr("disabled", false);
    } else {
        $("#" + target).attr("disabled", true);
    }
});

The "rel" attribute stores the id of the target input field.

What is the difference between HTML tags <div> and <span>?

I would say that if you know a bit of spanish to look at this page, where is properly explained.

However, a fast definition would be that div is for dividing sections and span is for applying some kind of style to an element within another block element like div.

TypeError: 'str' does not support the buffer interface

>>> s = bytes("s","utf-8")
>>> print(s)
b's'
>>> s = s.decode("utf-8")
>>> print(s)
s

Well if useful for you in case removing annoying 'b' character.If anyone got better idea please suggest me or feel free to edit me anytime in here.I'm just newbie

Import error: No module name urllib2

That worked for me in python3:

import urllib.request
htmlfile = urllib.request.urlopen("http://google.com")
htmltext = htmlfile.read()
print(htmltext)

How to "properly" print a list?

You can delete all unwanted characters from a string using its translate() method with None for the table argument followed by a string containing the character(s) you want removed for its deletechars argument.

lst = ['x', 3, 'b']

print str(lst).translate(None, "'")

# [x, 3, b]

If you're using a version of Python before 2.6, you'll need to use the string module's translate() function instead because the ability to pass None as the table argument wasn't added until Python 2.6. Using it looks like this:

import string

print string.translate(str(lst), None, "'")

Using the string.translate() function will also work in 2.6+, so using it might be preferable.

Python: IndexError: list index out of range

I think you mean to put the rolling of the random a,b,c, etc within the loop:

a = None # initialise
while not (a in winning_numbers):
    # keep rolling an a until you get one not in winning_numbers
    a = random.randint(1,30)
    winning_numbers.append(a)

Otherwise, a will be generated just once, and if it is in winning_numbers already, it won't be added. Since the generation of a is outside the while (in your code), if a is already in winning_numbers then too bad, it won't be re-rolled, and you'll have one less winning number.

That could be what causes your error in if guess[i] == winning_numbers[i]. (Your winning_numbers isn't always of length 5).

How to link to a named anchor in Multimarkdown?

If you have headers in the markdown files, you can directly link them in the file.

Markdown Header -

## The Header

this will generate an implicit id #the-header (replace internal spaces with hyphens and make lowercase).

To navigate to this id, you can create the link like this:

[Link to Header](#the-header)

This is equivalent to:

<a href="#the-header">Link to Header</a>

Please note the reference's name is a lower-case #header.

Jquery mouseenter() vs mouseover()

Though they operate the same way, however, the mouseenter event only triggers when the mouse pointer enters the selected element. The mouseover event is triggered if a mouse pointer enters any child elements as well.

MySQL LEFT JOIN Multiple Conditions

Correct answer is simply:

SELECT a.group_id
FROM a 
LEFT JOIN b ON a.group_id=b.group_id  and b.user_id = 4
where b.user_id is null
  and a.keyword like '%keyword%'

Here we are checking user_id = 4 (your user id from the session). Since we have it in the join criteria, it will return null values for any row in table b that does not match the criteria - ie, any group that that user_id is NOT in.

From there, all we need to do is filter for the null values, and we have all the groups that your user is not in.

demo here

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

Let say you have 2 columns named first_name and last_name in your users table and you want to retrieve full name. you can achieve with the following code :

class User extends Eloquent {


    public function getFullNameAttribute()
    {
        return $this->first_name.' '.$this->last_name;
    }
}

now you can get full name as:

$user = User::find(1);
$user->full_name;

Change the value in app.config file dynamically

It works, just look at the bin/Debug folder, you are probably looking at app.config file inside project.

Java client certificates over HTTPS/SSL

I think you have an issue with your server certificate, is not a valid certificate (I think this is what "handshake_failure" means in this case):

Import your server certificate into your trustcacerts keystore on client's JRE. This is easily done with keytool:

keytool
    -import
    -alias <provide_an_alias>
    -file <certificate_file>
    -keystore <your_path_to_jre>/lib/security/cacerts

jquery to loop through table rows and cells, where checkob is checked, concatenate

UPDATED

I've updated your demo: http://jsfiddle.net/terryyounghk/QS56z/18/

Also, I've changed two ^= to *=. See http://api.jquery.com/category/selectors/

And note the :checked selector. See http://api.jquery.com/checked-selector/

function createcodes() {

    //run through each row
    $('.authors-list tr').each(function (i, row) {

        // reference all the stuff you need first
        var $row = $(row),
            $family = $row.find('input[name*="family"]'),
            $grade = $row.find('input[name*="grade"]'),
            $checkedBoxes = $row.find('input:checked');

        $checkedBoxes.each(function (i, checkbox) {
            // assuming you layout the elements this way, 
            // we'll take advantage of .next()
            var $checkbox = $(checkbox),
                $line = $checkbox.next(),
                $size = $line.next();

            $line.val(
                $family.val() + ' ' + $size.val() + ', ' + $grade.val()
            );

        });

    });
}

Rename multiple files in a directory in Python

The following code should work. It takes every filename in the current directory, if the filename contains the pattern CHEESE_CHEESE_ then it is renamed. If not nothing is done to the filename.

import os
for fileName in os.listdir("."):
    os.rename(fileName, fileName.replace("CHEESE_CHEESE_", "CHEESE_"))

How to Check or Uncheck all Items in VB.NET CheckedListBox Control

Print a div content using Jquery

Print only selected element on codepen

HTML:

<div class="print">
 <p>Print 1</p>
 <a href="#" class="js-print-link">Click Me To Print</a>
</div>

<div class="print">
 <p>Print 2</p>
 <a href="#" class="js-print-link">Click Me To Print</a>
</div>

JQuery:

$('.js-print-link').on('click', function() {
  var printBlock = $(this).parents('.print').siblings('.print');
  printBlock.hide();
  window.print();
  printBlock.show();
});

Hive insert query like SQL

You could definitely append data into an existing table. (But it is actually not an append at the HDFS level). It's just that whenever you do a LOAD or INSERT operation on an existing Hive table without OVERWRITE clause the new data will be put without replacing the old data. A new file will be created for this newly inserted data inside the directory corresponding to that table. For example :

I have a file named demo.txt which has 2 lines :

ABC
XYZ

Create a table and load this file into it

hive> create table demo(foo string);
hive> load data inpath '/demo.txt' into table demo;

Now,if I do a SELECT on this table it'll give me :

hive> select * from demo;                        
OK    
ABC    
XYZ

Suppose, I have one more file named demo2.txt which has :

PQR

And I do a LOAD again on this table without using overwrite,

hive> load data inpath '/demo2.txt' into table demo;

Now, if I do a SELECT now, it'll give me,

hive> select * from demo;                       
OK
ABC
XYZ
PQR

HTH

CodeIgniter Disallowed Key Characters

Took a while to figure this one out. Seems most of us missed the obvious error…the last “-” is not escaped.

Adding the . and | as I’ve seen other suggest may work for you, but the regex was supposed to be:

if ( ! preg_match("/^[a-z0-9:_\/\-\.|]+$/i", $str))

Let JSON object accept bytes or let urlopen output strings

Python’s wonderful standard library to the rescue…

import codecs

reader = codecs.getreader("utf-8")
obj = json.load(reader(response))

Works with both py2 and py3.

Docs: Python 2, Python3

How to add custom method to Spring Data JPA

I extends the SimpleJpaRepository:

public class ExtendedRepositoryImpl<T extends EntityBean> extends SimpleJpaRepository<T, Long>
    implements ExtendedRepository<T> {

    private final JpaEntityInformation<T, ?> entityInformation;

    private final EntityManager em;

    public ExtendedRepositoryImpl(final JpaEntityInformation<T, ?> entityInformation,
                                                      final EntityManager entityManager) {
       super(entityInformation, entityManager);
       this.entityInformation = entityInformation;
       this.em = entityManager;
    }
}

and adds this class to @EnableJpaRepositoryries repositoryBaseClass.

List of Java class file format major version numbers?

If you have a class file at build/com/foo/Hello.class, you can check what java version it is compiled at using the command:

javap -v build/com/foo/Hello.class | grep "major"

Example usage:

$ javap -v build/classes/java/main/org/aguibert/liberty/Book.class | grep major
  major version: 57

According to the table in the OP, major version 57 means the class file was compiled to JDK 13 bytecode level

How to remove all click event handlers using jQuery?

Is there a way to remove all previous click events that have been assigned to a button?

$('#saveBtn').unbind('click').click(function(){saveQuestion(id)});

enable or disable checkbox in html

In jsp you can do it like this:

<%
boolean checkboxDisabled = true; //do your logic here
String checkboxState = checkboxDisabled ? "disabled" : "";
%>
<input type="checkbox" <%=checkboxState%>>

How to change progress bar's progress color in Android

You can try to change your Styles, Themes, or using android:indeterminateTint="@color/yourColor" anywhere you want, but there's just one way o doing that will work on any Android SKD version:

If you progress bar is not indeterminate, please use:

progressBar.getProgressDrawable().setColorFilter(ContextCompat.getColor(context, R.color.yourColor), PorterDuff.Mode.SRC_IN );

If you progress bar is indeterminate, please use:

progressBar.getIndeterminateDrawable().setColorFilter(ContextCompat.getColor(getContext(), R.color.yourColor), PorterDuff.Mode.SRC_IN );

It's sad that Android is such a mess!

Is there a concise way to iterate over a stream with indices in Java 8?

Just for completeness here's the solution involving my StreamEx library:

String[] names = {"Sam","Pamela", "Dave", "Pascal", "Erik"};
EntryStream.of(names)
    .filterKeyValue((idx, str) -> str.length() <= idx+1)
    .values().toList();

Here we create an EntryStream<Integer, String> which extends Stream<Entry<Integer, String>> and adds some specific operations like filterKeyValue or values. Also toList() shortcut is used.

Spring MVC: How to return image in @ResponseBody?

I think you maybe need a service to store file upload and get that file. Check more detail from here

1) Create a Storage Sevice

@Service
public class StorageService {

Logger log = LoggerFactory.getLogger(this.getClass().getName());
private final Path rootLocation = Paths.get("upload-dir");

public void store(MultipartFile file) {
    try {
        Files.copy(file.getInputStream(), this.rootLocation.resolve(file.getOriginalFilename()));
    } catch (Exception e) {
        throw new RuntimeException("FAIL!");
    }
}

public Resource loadFile(String filename) {
    try {
        Path file = rootLocation.resolve(filename);
        Resource resource = new UrlResource(file.toUri());
        if (resource.exists() || resource.isReadable()) {
            return resource;
        } else {
            throw new RuntimeException("FAIL!");
        }
    } catch (MalformedURLException e) {
        throw new RuntimeException("FAIL!");
    }
}

public void deleteAll() {
    FileSystemUtils.deleteRecursively(rootLocation.toFile());
}

public void init() {
    try {
        Files.createDirectory(rootLocation);
    } catch (IOException e) {
        throw new RuntimeException("Could not initialize storage!");
    }
}
}

2) Create Rest Controller to upload and get file

@Controller
public class UploadController {

@Autowired
StorageService storageService;

List<String> files = new ArrayList<String>();

@PostMapping("/post")
public ResponseEntity<String> handleFileUpload(@RequestParam("file") MultipartFile file) {
    String message = "";
    try {
        storageService.store(file);
        files.add(file.getOriginalFilename());

        message = "You successfully uploaded " + file.getOriginalFilename() + "!";
        return ResponseEntity.status(HttpStatus.OK).body(message);
    } catch (Exception e) {
        message = "FAIL to upload " + file.getOriginalFilename() + "!";
        return      ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body(message);
    }
}

@GetMapping("/getallfiles")
public ResponseEntity<List<String>> getListFiles(Model model) {
    List<String> fileNames = files
            .stream().map(fileName -> MvcUriComponentsBuilder
                    .fromMethodName(UploadController.class, "getFile", fileName).build().toString())
            .collect(Collectors.toList());

    return ResponseEntity.ok().body(fileNames);
}

@GetMapping("/files/{filename:.+}")
@ResponseBody
public ResponseEntity<Resource> getFile(@PathVariable String filename) {
    Resource file = storageService.loadFile(filename);
    return ResponseEntity.ok()
            .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + file.getFilename() + "\"")
            .body(file);
}

}

What's the difference between StaticResource and DynamicResource in WPF?

A StaticResource will be resolved and assigned to the property during the loading of the XAML which occurs before the application is actually run. It will only be assigned once and any changes to resource dictionary ignored.

A DynamicResource assigns an Expression object to the property during loading but does not actually lookup the resource until runtime when the Expression object is asked for the value. This defers looking up the resource until it is needed at runtime. A good example would be a forward reference to a resource defined later on in the XAML. Another example is a resource that will not even exist until runtime. It will update the target if the source resource dictionary is changed.

ECMAScript 6 class destructor

"A destructor wouldn't even help you here. It's the event listeners themselves that still reference your object, so it would not be able to get garbage-collected before they are unregistered."

Not so. The purpose of a destructor is to allow the item that registered the listeners to unregister them. Once an object has no other references to it, it will be garbage collected.

For instance, in AngularJS, when a controller is destroyed, it can listen for a destroy event and respond to it. This isn't the same as having a destructor automatically called, but it's close, and gives us the opportunity to remove listeners that were set when the controller was initialized.

// Set event listeners, hanging onto the returned listener removal functions
function initialize() {
    $scope.listenerCleanup = [];
    $scope.listenerCleanup.push( $scope.$on( EVENTS.DESTROY, instance.onDestroy) );
    $scope.listenerCleanup.push( $scope.$on( AUTH_SERVICE_RESPONSES.CREATE_USER.SUCCESS, instance.onCreateUserResponse ) );
    $scope.listenerCleanup.push( $scope.$on( AUTH_SERVICE_RESPONSES.CREATE_USER.FAILURE, instance.onCreateUserResponse ) );
}

// Remove event listeners when the controller is destroyed
function onDestroy(){
    $scope.listenerCleanup.forEach( remove => remove() );
}

Removing duplicate characters from a string

def dupe(str1):
    s=set(str1)

    return "".join(s)
str1='geeksforgeeks'
a=dupe(str1)
print(a)

works well if order is not important.

Java unsupported major minor version 52.0

Your code was compiled with Java Version 1.8 while it is being executed with Java Version 1.7 or below.

In your case it seems that two different Java installations are used, the newer to compile and the older to execute your code.

Try recompiling your code with Java 1.7 or upgrade your Java Plugin.

Form Submit jQuery does not work

If you are doing form validation such as

type="submit" onsubmit="return validateForm(this)"

validateForm = function(form) {
if ($('input#company').val() === "" || $('input#company').val() === "Company")  {
        $('input#company').val("Company").css('color','red'); finalReturn = false; 
        $('input#company').on('mouseover',(function() { 
            $('input#company').val("").css('color','black'); 
            $('input#company').off('mouseover');
            finalReturn = true; 
        }));
    } 

    return finalReturn; 
}

Double check you are returning true. This seems simple but I had

var finalReturn = false;

When the form was correct it was not being corrected by validateForm and so not being submitted as finalReturn was still initialized to false instead of true. By the way, above code works nicely with address, city, state and so on.

How to send an email with Python?

While indenting your code in the function (which is ok), you did also indent the lines of the raw message string. But leading white space implies folding (concatenation) of the header lines, as described in sections 2.2.3 and 3.2.3 of RFC 2822 - Internet Message Format:

Each header field is logically a single line of characters comprising the field name, the colon, and the field body. For convenience however, and to deal with the 998/78 character limitations per line, the field body portion of a header field can be split into a multiple line representation; this is called "folding".

In the function form of your sendmail call, all lines are starting with white space and so are "unfolded" (concatenated) and you are trying to send

From: [email protected]    To: [email protected]    Subject: Hello!    This message was sent with Python's smtplib.

Other than our mind suggests, smtplib will not understand the To: and Subject: headers any longer, because these names are only recognized at the beginning of a line. Instead smtplib will assume a very long sender email address:

[email protected]    To: [email protected]    Subject: Hello!    This message was sent with Python's smtplib.

This won't work and so comes your Exception.

The solution is simple: Just preserve the message string as it was before. This can be done by a function (as Zeeshan suggested) or right away in the source code:

import smtplib

def sendMail(FROM,TO,SUBJECT,TEXT,SERVER):
    """this is some test documentation in the function"""
    message = """\
From: %s
To: %s
Subject: %s

%s
""" % (FROM, ", ".join(TO), SUBJECT, TEXT)
    # Send the mail
    server = smtplib.SMTP(SERVER)
    server.sendmail(FROM, TO, message)
    server.quit()

Now the unfolding does not occur and you send

From: [email protected]
To: [email protected]
Subject: Hello!

This message was sent with Python's smtplib.

which is what works and what was done by your old code.

Note that I was also preserving the empty line between headers and body to accommodate section 3.5 of the RFC (which is required) and put the include outside the function according to the Python style guide PEP-0008 (which is optional).

Declaring abstract method in TypeScript

I use to throw an exception in the base class.

protected abstractMethod() {
    throw new Error("abstractMethod not implemented");
}

Then you have to implement in the sub-class. The cons is that there is no build error, but run-time. The pros is that you can call this method from the super class, assuming that it will work :)

HTH!

Milton

What are the dark corners of Vim your mom never told you about?

Often, I like changing current directories while editing - so I have to specify paths less.

cd %:h

Recursively list all files in a directory including files in symlink directories

find /dir -type f -follow -print

-type f means it will display real files (not symlinks)

-follow means it will follow your directory symlinks

-print will cause it to display the filenames.

If you want a ls type display, you can do the following

find /dir -type f -follow -print|xargs ls -l

How can I compare time in SQL Server?

Using float does not work.

DECLARE @t1 datetime, @t2 datetime
SELECT @t1 = '19000101 23:55:00', @t2 = '20001102 23:55:00'
SELECT CAST(@t1 as float) - floor(CAST(@t1 as float)), CAST(@t2 as float) - floor(CAST(@t2 as float))

You'll see that the values are not the same (SQL Server 2005). I wanted to use this method to check for times around midnight (the full method has more detail) in which I was comparing the current time for being between 23:55:00 and 00:05:00.

How to hide Bootstrap modal with javascript?

I realize this is an old question, but I found that none of these were really what I was looking for exactly. It seems to be caused by trying to close the modal before it's finished showing.

My solution was based on @schoonie23's answer but I had to change a few things.

First, I declared a global variable at the top of my script:

<script>
    var closeModal = false;
    ...Other Code...

Then in my modal code:

$('#myModal').on('show.bs.modal', function (event) {
    ...Some Code...
    if (someReasonToHideModal) {
        closeModal = true;
        return;
    }
    ...Other Code...

Then this: (Note the name 'shown.bs.modal' indicating that the modal has shown completely as opposed to 'show' that triggers when the show event is called. (I originally tried just 'shown' but it did not work.)

$('#myModal').on('shown.bs.modal', function (event) {
    if (closeEditModal) {
        $('#myModal').modal('hide');
        closeModal = false;
    }
});

Hope this saves someone the extra research some day. I spent a bit looking for a solution before I came up with this.

Detect if checkbox is checked or unchecked in Angular.js ng-change event

You could just use the bound ng-model (answers[item.questID]) value itself in your ng-change method to detect if it has been checked or not.

Example:-

<input type="checkbox" ng-model="answers[item.questID]" 
     ng-change="stateChanged(item.questID)" /> <!-- Pass the specific id -->

and

$scope.stateChanged = function (qId) {
   if($scope.answers[qId]){ //If it is checked
       alert('test');
   }
}

Android SeekBar setOnSeekBarChangeListener

Seekbar called onProgressChanged method when we initialize first time. We can skip by using below code We need to check boolean it return false when initialize automatically

volumeManager.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if(b){
                    mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, i, 0);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

How to get the class of the clicked element?

This should do the trick:

...
select: function(event, ui){ 
   ui.tab.attr('class');
} ,
...

For more info about the ui.tab see http://jqueryui.com/demos/tabs/#Events

How to put a tooltip on a user-defined function

I tried @ScottK's approach, first as a side feature of my functional UDF, then as a standalone _Help suffix version when I ran into trouble (see below). In hindsight, the latter approach is better anyway--more obvious to a user attentive enough to see a tool tip, and it doesn't clutter up the functional code.

I figured if an inattentive user just typed the function name and closed the parentheses while he thought it over, help would appear and he would be on his way. But dumping a bunch of text into a single cell that I cannot format didn't seem like a good idea. Instead, When the function is entered in a cell with no arguments i.e.

   = interpolateLinear() 
or
   = interpolateLinear_Help()

a msgBox opens with the help text. A msgBox is limited to ~1000 characters, maybe it's 1024. But that's enough (barely 8^/) for my overly tricked out interpolation function. If it's not, you can always open a user form and go to town.

The first time the message box opened, it looked like success. But there are a couple of problems. First of course, the user has to know to enter the function with no arguments (+1 for the _Help suffix UDF).

The big problem is, the msgBox reopens several times in succession, spontaneously while working in unrelated parts of the workbook. Needless to say, it's very annoying. Sometimes it goes on until I get a circular reference warning. Go figure. If a UDF could change the cell formula, I would have done that to shut it up.

I don't know why Excel feels the need recalculate the formula over and over; neither the _Help standalone, nor the full up version (in help mode) has precedents or dependents. There's not an application.volatile statement anywhere. Of course the function returns a value to the calling cell. Maybe that triggers the recalc? But that's what UDFs do. I don't think you can not return a value.

Since you can't modify a worksheet formula from a UDF, I tried to return a specific string --a value --to the calling cell (the only one you can change the value of from a UDF), figuring I would inspect the cell value using application.caller on the next cycle, spot my string, and know not to re-display the help message. Seemed like a good idea at the time--didn't work. Maybe I did something stupid in my sleep-deprived state. I still like the idea. I'll update this when (if) I fix the problem. My quick fix was to add a line on the help box: "Seek help only in an emergency. Delete the offending formula to end the misery.

In the meantime, I tried the Application.MacroOptions approach. Pretty easy, and it looks professional. Just one problem to work out. I'll post a separate answer on that approach later.

Maintaining Session through Angular.js

Here is a kind of snippet for you:

app.factory('Session', function($http) {
  var Session = {
    data: {},
    saveSession: function() { /* save session data to db */ },
    updateSession: function() { 
      /* load data from db */
      $http.get('session.json').then(function(r) { return Session.data = r.data;});
    }
  };
  Session.updateSession();
  return Session; 
});

Here is Plunker example how you can use that: http://plnkr.co/edit/Fg3uF4ukl5p88Z0AeQqU?p=preview

sql delete statement where date is greater than 30 days

GETDATE() didn't work for me using mySQL 8

ERROR 1305 (42000): FUNCTION mydatabase.GETDATE does not exist

but this does:

DELETE FROM table_name WHERE date_column < CURRENT_DATE - 30;

What is the difference between document.location.href and document.location?

As of June 14th 2013 (HTML5), there is a significant difference

Browser : Chrome 27.X.X

References: document.location, window.location (MDN)

document.location

type: Object

The object when called by itself document.location return its origin + pathname properties concatenated.

To retrieve just the URL as a string, the read-only document.URL property can be used.

ancestorOrigins: DOMStringList
assign: function () { [native code] }
hash: ""
host: "stackoverflow.com"
hostname: "stackoverflow.com"
href: "http://stackoverflow.com/questions/2652816/what-is-the-difference-between-document-location-href-and-document-location?rq=1"
origin: "http://stackoverflow.com"
pathname: "/questions/2652816/what-is-the-difference-between-document-location-href-and-document-location"
port: ""
protocol: "http:"
reload: function () { [native code] }
replace: function () { [native code] }
search: "?rq=1"
toString: function toString() { [native code] }
valueOf: function valueOf() { [native code] }

document.location.href

type: string

http://stackoverflow.com/questions/2652816/what-is-the-difference-between-document-location-href-and-document-location?rq=1

Throwing exceptions in a PHP Try Catch block

To rethrow do

 throw $e;

not the message.

Get RETURN value from stored procedure in SQL

Assign after the EXEC token:

DECLARE @returnValue INT

EXEC @returnValue = SP_One

How to dynamically add rows to a table in ASP.NET?

in addition to what Kirk said I want to tell you that just "playing around" won't help you to learn asp.net, and there is a lot of free and very good tutorials .
take a look on the asp.net official site tutorials and on 4GuysFromRolla site

Run a Command Prompt command from Desktop Shortcut

The solutions turned out to be very simple.

Open text edit
Write the command, save as .bat.
Double click the file created and the command automatically starts running in command-prompt.

Error: class X is public should be declared in a file named X.java

I encountered the same error once. It was really funny. I had created a backup of the .java file with different filename but the same class name. And kept on trying to build it till I checked all the files in my folder.

VS Code - Search for text in all files in a directory

And by the way for you fellow googlers for selecting multiple folders in the search input you separate your directories with a comma. Works both for exclude and include

Example: ./src/public/,src/components/

HTML checkbox onclick called in Javascript

How about putting the checkbox into the label, making the label automatically "click sensitive" for the check box, and giving the checkbox a onchange event?

<label ..... ><input type="checkbox" onchange="toggleCheckbox(this)" .....> 

function toggleCheckbox(element)
 {
   element.checked = !element.checked;
 }

This will additionally catch users using a keyboard to toggle the check box, something onclick would not.

isset PHP isset($_GET['something']) ? $_GET['something'] : ''

You have encountered the ternary operator. It's purpose is that of a basic if-else statement. The following pieces of code do the same thing.

Ternary:

$something = isset($_GET['something']) ? $_GET['something'] : "failed";

If-else:

if (isset($_GET['something'])) {
    $something = $_GET['something'];
} else {
    $something = "failed";
}

bash string equality

There's no difference, == is a synonym for = (for the C/C++ people, I assume). See here, for example.

You could double-check just to be really sure or just for your interest by looking at the bash source code, should be somewhere in the parsing code there, but I couldn't find it straightaway.

How to delete session cookie in Postman?

Is the Postman Interceptor enabled? Toggling it will route all requests and responses through the Chrome browser.

Interceptor - https://www.getpostman.com/docs/capture Cookies documentation - http://blog.getpostman.com/index.php/2014/11/28/using-the-interceptor-to-read-and-write-cookies/

SQL update statement in C#

string constr = @"Data Source=(LocalDB)\v11.0;Initial Catalog=Bank;Integrated Security=True;Pooling=False";
SqlConnection con = new SqlConnection(constr);
DataSet ds = new DataSet();
con.Open();
SqlCommand cmd = new SqlCommand(" UPDATE Account  SET name = Aleesha, CID = 24 Where name =Areeba and CID =11 )";
cmd.ExecuteNonQuery();

Force unmount of NFS-mounted directory

Couldn't find a working answer here; but on linux you can run "umount.nfs4 /volume -f" and it definitely unmounts it.

Set left margin for a paragraph in html

<p style="margin-left:5em;">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet. Phasellus tempor nisi eget tellus venenatis tempus. Aliquam dapibus porttitor convallis. Praesent pretium luctus orci, quis ullamcorper lacus lacinia a. Integer eget molestie purus. Vestibulum porta mollis tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. </p>

That'll do it, there's a few improvements obviously, but that's the basics. And I use 'em' as the measurement, you may want to use other units, like 'px'.

EDIT: What they're describing above is a way of associating groups of styles, or classes, with elements on a web page. You can implement that in a few ways, here's one which may suit you:

In your HTML page, containing the <p> tagged content from your DB add in a new 'style' node and wrap the styles you want to declare in a class like so:

<head>
  <style type="text/css">
    p { margin-left:5em; /* Or another measurement unit, like px */ }
  </style>
</head>
<body>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet.</p>
</body>

So above, all <p> elements in your document will have that style rule applied. Perhaps you are pumping your paragraph content into a container of some sort? Try this:

<head>
  <style type="text/css">
    .container p { margin-left:5em; /* Or another measurement unit, like px */ }
  </style>
</head>
<body>
  <div class="container">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut lacinia vestibulum quam sit amet aliquet.</p>
  </div>
  <p>Vestibulum porta mollis tempus. Class aptent taciti sociosqu ad litora torquent per conubia nostra.</p>
</body>

In the example above, only the <p> element inside the div, whose class name is 'container', will have the styles applied - and not the <p> element outside the container.

In addition to the above, you can collect your styles together and remove the style element from the <head> tag, replacing it with a <link> tag, which points to an external CSS file. This external file is where you'd now put your <p> tag styles. This concept is known as 'seperating content from style' and is considered good practice, and is also an extendible way to create styles, and can help with low maintenance.

How can I suppress column header output for a single SQL statement?

You can fake it like this:

-- with column headings 
select column1, column2 from some_table;

-- without column headings
select column1 as '', column2 as '' from some_table;

What is the difference between a mutable and immutable string in C#?

Immutable :

When you do some operation on a object, it creates a new object hence state is not modifiable as in case of string.

Mutable

When you perform some operation on a object, object itself modified no new obect created as in case of StringBuilder

How to know what the 'errno' means?

Call

perror("execl");

in case of error.

Sample:

if(read(fd, buf, 1)==-1) {
    perror("read");
}

The manpages of errno(3) and perror(3) are interesting, too...

What do 'real', 'user' and 'sys' mean in the output of time(1)?

To expand on the accepted answer, I just wanted to provide another reason why real ? user + sys.

Keep in mind that real represents actual elapsed time, while user and sys values represent CPU execution time. As a result, on a multicore system, the user and/or sys time (as well as their sum) can actually exceed the real time. For example, on a Java app I'm running for class I get this set of values:

real    1m47.363s
user    2m41.318s
sys     0m4.013s

Python read in string from file and split it into values

Something like this - for each line read into string variable a:

>>> a = "123,456"
>>> b = a.split(",")
>>> b
['123', '456']
>>> c = [int(e) for e in b]
>>> c
[123, 456]
>>> x, y = c
>>> x
123
>>> y
456

Now you can do what is necessary with x and y as assigned, which are integers.

How to get the difference between two dictionaries in Python?

You were right to look at using a set, we just need to dig in a little deeper to get your method to work.

First, the example code:

test_1 = {"foo": "bar", "FOO": "BAR"}
test_2 = {"foo": "bar", "f00": "b@r"}

We can see right now that both dictionaries contain a similar key/value pair:

{"foo": "bar", ...}

Each dictionary also contains a completely different key value pair. But how do we detect the difference? Dictionaries don't support that. Instead, you'll want to use a set.

Here is how to turn each dictionary into a set we can use:

set_1 = set(test_1.items())
set_2 = set(test_2.items())

This returns a set containing a series of tuples. Each tuple represents one key/value pair from your dictionary.

Now, to find the difference between set_1 and set_2:

print set_1 - set_2
>>> {('FOO', 'BAR')}

Want a dictionary back? Easy, just:

dict(set_1 - set_2)
>>> {'FOO': 'BAR'}

How to expand textarea width to 100% of parent (or how to expand any HTML element to 100% of parent width)?

The box model is something every web-developer should know about. working with percents for sizes and pixels for padding/margin just doesn't work. There always is a resolution at which it doesn't look good (e.g. giving a width of 90% and a padding/margin of 10px in a div with a width of under 100px).

Check this out (using micro.pravi's code): http://jsbin.com/umeduh/2

<div id="container">
    <div class="left">
        <div class="content">
            left
        </div>
    </div>
    <div class="right">
        <div class="content">
            right
            <textarea>Check me out!</textarea>
        </div>
    </div>
</div>

The <div class="content"> are there so you can use padding and margin without screwing up the floats.

this is the most important part of the CSS:

textarea {
    display: block;
    width: 100%;
    -webkit-box-sizing: border-box;
       -moz-box-sizing: border-box;
            box-sizing: border-box;
}

Using partial views in ASP.net MVC 4

Change the code where you load the partial view to:

@Html.Partial("_CreateNote", new QuickNotes.Models.Note())

This is because the partial view is expecting a Note but is getting passed the model of the parent view which is the IEnumerable

TransactionRequiredException Executing an update/delete query

After integrating Spring 4 with Hibernate 5 in my project and experiencing this problem, I found that I could prevent the error from appearing by changing the way of getting the session from sessionFactory.openSession() to sessionFactory.getCurrentSession(). the proper way to work out this bug may be keep using the same session for the binding transaction.opensession will always create a new session which doesnt like the former one holding a transaction configed.using getCurrentSession and adding additional property <property name="current_session_context_class">org.springframework.orm.hibernate5.SpringSessionContext</property> works fine for me.

How can I remove file extension from a website address?

You have different choices. One on them is creating a folder named "profile" and rename your "profile.php" to "default.php" and put it into "profile" folder. and you can give orders to this page in this way:

Old page: http://something.com/profile.php?id=a&abc=1

New page: http://something.com/profile/?id=a&abc=1

If you are not satisfied leave a comment for complicated methods.

Google Play on Android 4.0 emulator

Download the gapps package from http://goo.im/gapps
extract GoogleLoginService.apk,GoogleServicesFramework.apk and Vending.apk Go to cmd window type adb shell
1. on the shell type mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
2. then press Ctrl+c to exit. cd to the directory where apks has been extracted,
3. type adb push <appname>.apk /system/app
4. then type adb reboot

Oracle - How to create a materialized view with FAST REFRESH and JOINS

The key checks for FAST REFRESH includes the following:

1) An Oracle materialized view log must be present for each base table.
2) The RowIDs of all the base tables must appear in the SELECT list of the MVIEW query definition.
3) If there are outer joins, unique constraints must be placed on the join columns of the inner table.

No 3 is easy to miss and worth highlighting here

How to return a specific element of an array?

I want to return odd numbers of an array

If i read that correctly, you want something like this?

List<Integer> getOddNumbers(int[] integers) {
  List<Integer> oddNumbers = new ArrayList<Integer>();
  for (int i : integers)
    if (i % 2 != 0)
      oddNumbers.add(i);
  return oddNumbers;
}

How to remove default chrome style for select Input?

Mixin for Less

.appearance (@value: none) {
    -webkit-appearance:     @value;
    -moz-appearance:        @value;
    -ms-appearance:         @value;
    -o-appearance:          @value;
    appearance:             @value;
}

What's the difference between a Future and a Promise?

Not sure if this can be an answer but as I see what others have said for someone it may look like you need two separate abstractions for both of these concepts so that one of them (Future) is just a read-only view of the other (Promise) ... but actually this is not needed.

For example take a look at how promises are defined in javascript:

https://promisesaplus.com/

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise

The focus is on the composability using the then method like:

asyncOp1()
.then(function(op1Result){
  // do something
  return asyncOp2();
})
.then(function(op2Result){
  // do something more
  return asyncOp3();
})
.then(function(op3Result){
  // do something even more
  return syncOp4(op3Result);
})
...
.then(function(result){
  console.log(result);
})
.catch(function(error){
  console.log(error);
})

which makes asynchronous computation to look like synchronous:

try {
  op1Result = syncOp1();
  // do something
  op1Result = syncOp2();
  // do something more
  op3Result = syncOp3();
  // do something even more
  syncOp4(op3Result);
  ...
  console.log(result);
} catch(error) {
  console.log(error);
}

which is pretty cool. (Not as cool as async-await but async-await just removes the boilerplate ....then(function(result) {.... from it).

And actually their abstraction is pretty good as the promise constructor

new Promise( function(resolve, reject) { /* do it */ } );

allows you to provide two callbacks which can be used to either complete the Promise successfully or with an error. So that only the code that constructs the Promise can complete it and the code that receives an already constructed Promise object has the read-only view.

With inheritance the above can be achieved if resolve and reject are protected methods.

java.lang.UnsupportedClassVersionError: Bad version number in .class file?

changing the project to use java 1.7: For this to work follow those steps :

Change Compiler Compliance Level
Change your projects JRE/JDK to something of the same level(1.7 in my case)
Do the same change in all the projects referenced by your project
Change your run/debug configuration to use the JRE/JDK (or of the same level)

Not working?

delete projects Bin directory
Clean
reBuild

Still not working?

in your project's directory: edit .settings/org.eclipse.jdt.core.prefs > make sure your target level is applied

Good Luck!

How to make clang compile to llvm IR

Did you read clang documentation ? You're probably looking for -emit-llvm.

How to use Spring Boot with MySQL database and JPA?

In the spring boot reference,it said:

When a class doesn’t include a package declaration it is considered to be in the “default package”. The use of the “default package” is generally discouraged, and should be avoided. It can cause particular problems for Spring Boot applications that use @ComponentScan, @EntityScan or @SpringBootApplication annotations, since every class from every jar, will be read.

com
 +- example
     +- myproject
         +- Application.java
         |
         +- domain
         |   +- Customer.java
         |   +- CustomerRepository.java
         |
         +- service
         |   +- CustomerService.java
         |
         +- web
             +- CustomerController.java

In your cases. You must add scanBasePackages in the @SpringBootApplication annotation.just like@SpringBootApplication(scanBasePackages={"domain","contorller"..})

What's the difference between F5 refresh and Shift+F5 in Google Chrome browser?

Reload the current page:
F5
or
CTRL + R

Reload the current page, ignoring cached content (i.e. JavaScript files, images, etc.):
SHIFT + F5
or
CTRL + F5
or
CTRL + SHIFT + R

What's "this" in JavaScript onclick?

In the case you are asking about, this represents the HTML DOM element.

So it would be the <a> element that was clicked on.

Trying to check if username already exists in MySQL database using PHP

change your query to like.

$username = mysql_real_escape_string($username); // escape string before passing it to query.
$query = mysql_query("SELECT username FROM Users WHERE username='".$username."'");

However, MySQL is deprecated. You should instead use MySQLi or PDO

adding css file with jquery

Try doing it the other way around.

$('<link rel="stylesheet" href="css/style2.css" type="text/css" />').appendTo('head');

C++ Array Of Pointers

I would do it something along these lines:

class Foo{
...
};

int main(){
  Foo* arrayOfFoo[100]; //[1]

  arrayOfFoo[0] = new Foo; //[2]
}

[1] This makes an array of 100 pointers to Foo-objects. But no Foo-objects are actually created.

[2] This is one possible way to instantiate an object, and at the same time save a pointer to this object in the first position of your array.

IntelliJ IDEA JDK configuration on Mac OS

The JDK path might change when you update JAVA. For Mac you should go to the following path to check the JAVA version installed.

/Library/Java/JavaVirtualMachines/

Next, say JDK version that you find is jdk1.8.0_151.jdk, the path to home directory within it is the JDK home path.

In my case it was :

/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home

You can configure it by going to File -> Project Structure -> SDKs.

How to get year, month, day, hours, minutes, seconds and milliseconds of the current moment in Java?

Use the formatting pattern 'dd-MM-yyyy HH:mm:ss aa' to get date as 21-10-2020 20:53:42 pm

Make selected block of text uppercase

Update on March 8, 2018 with Visual Studio Code 1.20.1 (mac)

It has been simplified quite a lot lately.
Very easy and straight forward now.

From "Code" -> "Preferences" -> "Keyboard shortcuts"
From the search box just search for "editor.action.transformTo", You will see the screen like:
Click the "plus" sign at the left of each item, it will prompt dialog for your to [press] you desired key-bindings, after it showing that on the screen, just hit [Enter] to save.

How to check if mysql database exists

A very simple BASH-one-liner:

mysqlshow | grep dbname

Can't build create-react-app project with custom PUBLIC_URL

If you see there source code they check if process.env.NODE_ENV === 'development' returns true, and they automatically removes host URL and only return path.

For example, if you set like below

PUBLIC_URL=http://example.com/static/

They will remove http://example.com and only return /static.

However since you only set root URL like http://example.com, they will just return an empty string since there no subpath in your URL string.

This only happens if you call react-scripts start, and if you call react-scripts build then isEnvDevelopment will be false, so it will just return http://example.com as what you set in the .env file.

Here is the source code of getPublicUrlOrPath.js.

/**
 * Returns a URL or a path with slash at the end
 * In production can be URL, abolute path, relative path
 * In development always will be an absolute path
 * In development can use `path` module functions for operations
 *
 * @param {boolean} isEnvDevelopment
 * @param {(string|undefined)} homepage a valid url or pathname
 * @param {(string|undefined)} envPublicUrl a valid url or pathname
 * @returns {string}
 */
function getPublicUrlOrPath(isEnvDevelopment, homepage, envPublicUrl) {
  const stubDomain = 'https://create-react-app.dev';

  if (envPublicUrl) {
    // ensure last slash exists
    envPublicUrl = envPublicUrl.endsWith('/')
      ? envPublicUrl
      : envPublicUrl + '/';

    // validate if `envPublicUrl` is a URL or path like
    // `stubDomain` is ignored if `envPublicUrl` contains a domain
    const validPublicUrl = new URL(envPublicUrl, stubDomain);

    return isEnvDevelopment
      ? envPublicUrl.startsWith('.')
        ? '/'
        : validPublicUrl.pathname
      : // Some apps do not use client-side routing with pushState.
        // For these, "homepage" can be set to "." to enable relative asset paths.
        envPublicUrl;
  }

  if (homepage) {
    // strip last slash if exists
    homepage = homepage.endsWith('/') ? homepage : homepage + '/';

    // validate if `homepage` is a URL or path like and use just pathname
    const validHomepagePathname = new URL(homepage, stubDomain).pathname;
    return isEnvDevelopment
      ? homepage.startsWith('.')
        ? '/'
        : validHomepagePathname
      : // Some apps do not use client-side routing with pushState.
      // For these, "homepage" can be set to "." to enable relative asset paths.
      homepage.startsWith('.')
      ? homepage
      : validHomepagePathname;
  }

  return '/';
}

CSS Layout - Dynamic width DIV

This will do what you want. Fixed sides with 50px-width, and the content fills the remaining area.

<div style="width:100%;">
    <div style="width: 50px; float: left;">Left Side</div>
    <div style="width: 50px; float: right;">Right Side</div>
    <div style="margin-left: 50px; margin-right: 50px;">Content Goes Here</div>
</div>

PHP7 : install ext-dom issue

sudo apt install php-xml will work but the thing is it will download the plugin for the latest PHP version.

If your PHP version is not the latest, then you can add version in it:

# PHP 7.1
sudo apt install php7.1-xml

# PHP 7.2:
sudo apt install php7.2-xml

# PHP 7.3
sudo apt install php7.3-xml


# PHP 7.4
sudo apt install php7.4-xml

# PHP 8
sudo apt install php-xml

Start service in Android

Intent serviceIntent = new Intent(this,YourActivity.class);

startService(serviceIntent);

add service in manifist

<service android:enabled="true" android:name="YourActivity.class" />

for running service on oreo and greater devices use for ground service and show notification to user

or use geofencing service for location update in background reference http://stackoverflow.com/questions/tagged/google-play-services

Using success/error/finally/catch with Promises in AngularJS

I do it like Bradley Braithwaite suggests in his blog:

app
    .factory('searchService', ['$q', '$http', function($q, $http) {
        var service = {};

        service.search = function search(query) {
            // We make use of Angular's $q library to create the deferred instance
            var deferred = $q.defer();

            $http
                .get('http://localhost/v1?=q' + query)
                .success(function(data) {
                    // The promise is resolved once the HTTP call is successful.
                    deferred.resolve(data);
                })
                .error(function(reason) {
                    // The promise is rejected if there is an error with the HTTP call.
                    deferred.reject(reason);
                });

            // The promise is returned to the caller
            return deferred.promise;
        };

        return service;
    }])
    .controller('SearchController', ['$scope', 'searchService', function($scope, searchService) {
        // The search service returns a promise API
        searchService
            .search($scope.query)
            .then(function(data) {
                // This is set when the promise is resolved.
                $scope.results = data;
            })
            .catch(function(reason) {
                // This is set in the event of an error.
                $scope.error = 'There has been an error: ' + reason;
            });
    }])

Key Points:

The resolve function links to the .then function in our controller i.e. all is well, so we can keep our promise and resolve it.

The reject function links to the .catch function in our controller i.e. something went wrong, so we can’t keep our promise and need to reject it.

It is quite stable and safe and if you have other conditions to reject the promise you can always filter your data in the success function and call deferred.reject(anotherReason) with the reason of the rejection.

As Ryan Vice suggested in the comments, this may not be seen as useful unless you fiddle a bit with the response, so to speak.

Because success and error are deprecated since 1.4 maybe it is better to use the regular promise methods then and catch and transform the response within those methods and return the promise of that transformed response.

I am showing the same example with both approaches and a third in-between approach:

success and error approach (success and error return a promise of an HTTP response, so we need the help of $q to return a promise of data):

function search(query) {
  // We make use of Angular's $q library to create the deferred instance
  var deferred = $q.defer();

  $http.get('http://localhost/v1?=q' + query)
  .success(function(data,status) {
    // The promise is resolved once the HTTP call is successful.
    deferred.resolve(data);              
  })

  .error(function(reason,status) {
    // The promise is rejected if there is an error with the HTTP call.
    if(reason.error){
      deferred.reject({text:reason.error, status:status});
    }else{
      //if we don't get any answers the proxy/api will probably be down
      deferred.reject({text:'whatever', status:500});
    }
  });

  // The promise is returned to the caller
  return deferred.promise;
};

then and catch approach (this is a bit more difficult to test, because of the throw):

function search(query) {

  var promise=$http.get('http://localhost/v1?=q' + query)

  .then(function (response) {
    // The promise is resolved once the HTTP call is successful.
    return response.data;
  },function(reason) {
    // The promise is rejected if there is an error with the HTTP call.
    if(reason.statusText){
      throw reason;
    }else{
      //if we don't get any answers the proxy/api will probably be down
      throw {statusText:'Call error', status:500};
    }

  });

  return promise;
}

There is a halfway solution though (this way you can avoid the throw and anyway you'll probably need to use $q to mock the promise behavior in your tests):

function search(query) {
  // We make use of Angular's $q library to create the deferred instance
  var deferred = $q.defer();

  $http.get('http://localhost/v1?=q' + query)

  .then(function (response) {
    // The promise is resolved once the HTTP call is successful.
    deferred.resolve(response.data);
  },function(reason) {
    // The promise is rejected if there is an error with the HTTP call.
    if(reason.statusText){
      deferred.reject(reason);
    }else{
      //if we don't get any answers the proxy/api will probably be down
      deferred.reject({statusText:'Call error', status:500});
    }

  });

  // The promise is returned to the caller
  return deferred.promise;
}

Any kind of comments or corrections are welcome.

Global Variable from a different file Python

All given answers are wrong. It is impossible to globalise a variable inside a function in a separate file.

IntelliJ does not show project folders

I just had the same problem with an SBT project in IntelliJ 2016.2 after removing a globally installed IntelliJ and re-installing in my own home folder (Linux). No files or folders were shown in Project View anymore.

The Project Structure view wouldn't even open, and renaming the .idea folder to .idea.bak and re-importing the project didn't make any difference.

However, what fixed it for me was to reboot Linux. Afterwards it worked again, even with the original .idea folder. Seems this "fix" is not only restricted to the Windows world.

What is the difference between "mvn deploy" to a local repo and "mvn install"?

"matt b" has it right, but to be specific, the "install" goal copies your built target to the local repository on your file system; useful for small changes across projects not currently meant for the full group.

The "deploy" goal uploads it to your shared repository for when your work is finished, and then can be shared by other people who require it for their project.

In your case, it seems that "install" is used to make the management of the deployment easier since CI's local repo is the shared repo. If CI was on another box, it would have to use the "deploy" goal.

Android layout replacing a view with another view on run time

it work in my case, oldSensor and newSnsor - oldView and newView:

private void replaceSensors(View oldSensor, View newSensor) {
            ViewGroup parent = (ViewGroup) oldSensor.getParent();

            if (parent == null) {
                return;
            }

            int indexOldSensor = parent.indexOfChild(oldSensor);
            int indexNewSensor = parent.indexOfChild(newSensor);
            parent.removeView(oldSensor);
            parent.addView(oldSensor, indexNewSensor);
            parent.removeView(newSensor);
            parent.addView(newSensor, indexOldSensor);
        }

Jquery select this + class

Use find()

$(this).find(".subclass").css("visibility","visible");

Executing <script> injected by innerHTML after AJAX call

My conclusion is HTML doesn't allows NESTED SCRIPT tags. If you are using javascript for injecting HTML code that include script tags inside is not going to work because the javascript goes in a script tag too. You can test it with the next code and you will be that it's not going to work. The use case is you are calling a service with AJAX or similar, you are getting HTML and you want to inject it in the HTML DOM straight forward. If the injected HTML code has inside SCRIPT tags is not going to work.

<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></head><body></body><script>document.getElementsByTagName("body")[0].innerHTML = "<script>console.log('hi there')</script>\n<div>hello world</div>\n"</script></html>

WARNING: API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'

Upgrading protobuf-gradle-plugin to version 0.8.10 solved my problem. Replace your existing protobuf with

classpath 'gradle.plugin.com.google.protobuf:protobuf-gradle-plugin:0.8.10'

How to get access to job parameters from ItemReader, in Spring Batch?

Pretty late, but you can also do this by annotating a @BeforeStep method:

@BeforeStep
    public void beforeStep(final StepExecution stepExecution) {
        JobParameters parameters = stepExecution.getJobExecution().getJobParameters();
        //use your parameters
}

pthread function from a class

The above answers are good, but in my case, 1st approach that converts the function to be a static didn't work. I was trying to convert exiting code to move into thread function but that code had lots to references to non-static class members already. The second solution of encapsulating into C++ object works, but has 3-level wrappers to run a thread.

I had an alternate solution that uses existing C++ construct - 'friend' function, and it worked perfect for my case. An example of how I used 'friend' (will use the above same example for names showing how it can be converted into a compact form using friend)

    class MyThreadClass
    {
    public:
       MyThreadClass() {/* empty */}
       virtual ~MyThreadClass() {/* empty */}

       bool Init()
       {
          return (pthread_create(&_thread, NULL, &ThreadEntryFunc, this) == 0);
       }

       /** Will not return until the internal thread has exited. */
       void WaitForThreadToExit()
       {
          (void) pthread_join(_thread, NULL);
       }

    private:
       //our friend function that runs the thread task
       friend void* ThreadEntryFunc(void *);

       pthread_t _thread;
    };

    //friend is defined outside of class and without any qualifiers
    void* ThreadEntryFunc(void *obj_param) {
    MyThreadClass *thr  = ((MyThreadClass *)obj_param); 

    //access all the members using thr->

    return NULL;
    }

Ofcourse, we can use boost::thread and avoid all these, but I was trying to modify the C++ code to not use boost (the code was linking against boost just for this purpose)

How can I search (case-insensitive) in a column using LIKE wildcard?

The case sensitivity is defined in the columns / tables / database collation settings. You can do the query under a specific collation in the following way:

SELECT *
FROM trees
WHERE trees.`title` LIKE '%elm%' COLLATE utf8_general_ci

for instance.

(Replace utf8_general_ci with whatever collation you find useful). The _ci stands for case insensitive.

How do I compare two string variables in an 'if' statement in Bash?

I suggest this one:

if [ "$a" = "$b" ]

Notice the white space between the openning/closing brackets and the variables and also the white spaces wrapping the '=' sign.

Also, be careful of your script header. It's not the same thing whether you use

#!/bin/bash

#!/bin/sh

Here's the source.

Global variables in header file

Dont define varibale in header file , do declaration in header file(good practice ) .. in your case it is working because multiple weak symbols .. Read about weak and strong symbol ....link :http://csapp.cs.cmu.edu/public/ch7-preview.pdf

This type of code create problem while porting.

Matrix Multiplication in pure Python?

When I had to do some matrix arithmetic I defined a new class to help. Within such a class you can define magic methods like __add__, or, in your use-case, __matmul__, allowing you to define x = a @ b or a @= b rather than matrixMult(a,b). __matmul__ was added in Python 3.5 per PEP 465.

I have included some code which implements this below (I excluded the prohibitively long __init__ method, which essentially creates a two-dimensional list self.mat and a tuple self.order according to what is passed to it)

class Matrix:
    def __matmul__(self, multiplier):
        if self.order[1] != multiplier.order[0]:
            raise ValueError("The multiplier was non-conformable under multiplication.")
        return [[sum(a*b for a,b in zip(srow,mcol)) for mcol in zip(*multiplier.mat)] for srow in self.mat]

    def __imatmul__(self, multiplier):
        self.mat = self @ multiplier
        return self.mat

    def __rmatmul__(self, multiplicand):
        if multiplicand.order[1] != self.order[0]:
            raise ValueError("The multiplier was non-conformable under multiplication.")
        return [[sum(a*b for a,b in zip(mrow,scol)) for scol in zip(*self.mat)] for mrow in multiplicand.mat]

Note:

__rmatmul__ is used if b @ a is called and b does not implement __matmul__ (e.g. if I wanted to implement premultiplying by a 2D list)
__imatmul__ is required for a @= b to work correctly;
If a matrix is non-conformable under multiplication it means that it cannot be multiplied, usually because it has more or less rows than there are columns in the multiplicand

Create a rounded button / button with border-radius in Flutter

Different ways to create a Rounded button are as follows

FlatButton Button with Shape RoundedRectangleBorder

FlatButton(
minWidth: 260,
height: 60,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(18.0),
side: BorderSide(color: Colors.red)),
color: Colors.white,
textColor: Colors.red,
padding: EdgeInsets.all(8.0),
onPressed: () {},
child: Text(
"Add to Cart".toUpperCase(),
style: TextStyle(
fontSize: 14.0,
),
),
),

RaisedButton Button with Shape RoundedRectangleBorder

RaisedButton(
padding:
EdgeInsets.only(left: 100, right: 100, top: 20, bottom: 20),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(28.0),
side: BorderSide(color: Colors.red)),
onPressed: () {},
color: Colors.red,
textColor: Colors.white,
child: Text("Buy now".toUpperCase(),
style: TextStyle(fontSize: 14)),
),

RaisedButton Button with Shape StadiumBorder()

RaisedButton(
padding:
EdgeInsets.only(left: 100, right: 100, top: 20, bottom: 20),
shape: StadiumBorder(),
onPressed: () {},
child: Text("Button"),
)

RaisedButton Button with ClipRRect

ClipRRect(
borderRadius: BorderRadius.circular(40),
child: RaisedButton(
padding: EdgeInsets.only(
left: 100, right: 100, top: 20, bottom: 20),
onPressed: () {},
child: Text("Button"),
),
)

RaisedButton Button with ClipOval

ClipOval(
child: RaisedButton(
onPressed: () {},
child: Text("Button"),
),
),

RaisedButton Button with ButtonTheme

ButtonTheme(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20)),
child: RaisedButton(
onPressed: () {},
child: Text("Button"),
),
)

practical demonstration of a round button can be found in below dartpad link

Rounded Button Demo Examples on DartPad

How to update record using Entity Framework 6?

I found a way that works just fine.

 var Update = context.UpdateTables.Find(id);
        Update.Title = title;

        // Mark as Changed
        context.Entry(Update).State = System.Data.Entity.EntityState.Modified;
        context.SaveChanges();

Error:java: javacTask: source release 8 requires target release 1.8

Under compiler.xml file you will find :

<bytecodeTargetLevel>
  <module name="your_project_name_main" target="1.8" />
  <module name="your_project_name_test" target="1.8" />
</bytecodeTargetLevel>

and you can change the target value from your old to the new for me i needed to change it from 1.5 to 1.8

Strip double quotes from a string in .NET

I think your first line would actually work but I think you need four quotation marks for a string containing a single one (in VB at least):

s = s.Replace("""", "")

for C# you'd have to escape the quotation mark using a backslash:

s = s.Replace("\"", "");

What is .htaccess file?

.htaccess file create in directory /var/www/html/.htaccess

<IfModule mod_rewrite.c>

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [QSA,L]
</IfModule>

Test for non-zero length string in Bash: [ -n "$var" ] or [ "$var" ]

An alternative and perhaps more transparent way of evaluating an empty environment variable is to use...

  if [ "x$ENV_VARIABLE" != "x" ] ; then
      echo 'ENV_VARIABLE contains something'
  fi

HTML img scaling

No Javascript required.

IE6 Internet Explorer 6

Percent only works for the width of an element, but height:100%; does not work without the correct code.

CSS

html, body { height:100%; }

Then using a percentage works properly, and dynamically updates on window resize.

<img src="image.jpg" style="height:80%;">

You do not need a width attribute, the width scales proportionately as the browser window size is changed.

And this little gem, is in case the image is scaled up, it will not look (overly) blocky (it interpolates).

img { -ms-interpolation-mode: bicubic; }

Props go to this source: Ultimate IE6 Cheatsheet: How To Fix 25+ Internet Explorer 6 Bugs

How do you specify table padding in CSS? ( table, not cell padding )

You can't... Maybe if you posted a picture of the desired effect there's another way to achieve it.

For example, you can wrap the entire table in a DIV and set the padding to the div.

What is the best Java email address validation method?

Another option is use the Hibernate email validator, using the annotation @Email or using the validator class programatically, like:

import org.hibernate.validator.internal.constraintvalidators.hv.EmailValidator; 

class Validator {
    // code
    private boolean isValidEmail(String email) {
        EmailValidator emailValidator = new EmailValidator();
        return emailValidator.isValid(email, null);
    }

}

How to Set user name and Password of phpmyadmin

You can simply open the phpmyadmin page from your browser, then open any existing database -> go to Privileges tab, click on your root user and then a popup window will appear, you can set your password there.. Hope this Helps.

background:none vs background:transparent what is the difference?

To complement the other answers: if you want to reset all background properties to their initial value (which includes background-color: transparent and background-image: none) without explicitly specifying any value such as transparent or none, you can do so by writing:

background: initial;

How to hide a navigation bar from first ViewController in Swift?

Ways to hide Navigation Bar in Swift:

self.navigationController?.setNavigationBarHidden(true, animated: true)
self.navigationController?.navigationBar.isHidden = true
self.navigationController?.isNavigationBarHidden = true

Does C have a string type?

First, you don't need to do all that. In particular, the strcpy is redundant - you don't need to copy a string just to printf it. Your message can be defined with that string in place.

Second, you've not allowed enough space for that "Hello, World!" string (message needs to be at least 14 characters, allowing the extra one for the null terminator).

On the why, though, it's history. In assembler, there are no strings, only bytes, words etc. Pascal had strings, but there were problems with static typing because of that - string[20] was a different type that string[40]. There were languages even in the early days that avoided this issue, but that caused indirection and dynamic allocation overheads which were much more of an efficiency problem back then.

C simply chose to avoid the overheads and stay very low level. Strings are character arrays. Arrays are very closely related to pointers that point to their first item. When array types "decay" to pointer types, the buffer-size information is lost from the static type, so you don't get the old Pascal string issues.

In C++, there's the std::string class which avoids a lot of these issues - and has the dynamic allocation overheads, but these days we usually don't care about that. And in any case, std::string is a library class - there's C-style character-array handling underneath.

git stash changes apply to new branch?

Since you've already stashed your changes, all you need is this one-liner:

git stash branch <branchname> [<stash>]

From the docs (https://www.kernel.org/pub/software/scm/git/docs/git-stash.html):

Creates and checks out a new branch named <branchname> starting from the commit at which the <stash> was originally created, applies the changes recorded in <stash> to the new working tree and index. If that succeeds, and <stash> is a reference of the form stash@{<revision>}, it then drops the <stash>. When no <stash> is given, applies the latest one.

This is useful if the branch on which you ran git stash save has changed enough that git stash apply fails due to conflicts. Since the stash is applied on top of the commit that was HEAD at the time git stash was run, it restores the originally stashed state with no conflicts.

Programs & Examples On #Solid bodies