Programs & Examples On #Tweener

How do I make flex box work in safari?

Demo -> https://jsfiddle.net/xdsuozxf/

Safari still requires the -webkit- prefix to use flexbox.

_x000D_
_x000D_
.row{_x000D_
    box-sizing: border-box;_x000D_
    display: -webkit-box;_x000D_
    display: -webkit-flex;_x000D_
    display: -ms-flexbox;_x000D_
    display: flex;_x000D_
    -webkit-flex: 0 1 auto;_x000D_
    -ms-flex: 0 1 auto;_x000D_
    flex: 0 1 auto;_x000D_
    -webkit-box-orient: horizontal;_x000D_
    -webkit-box-direction: normal;_x000D_
    -webkit-flex-direction: row;_x000D_
    -ms-flex-direction: row;_x000D_
    flex-direction: row;_x000D_
    -webkit-flex-wrap: wrap;_x000D_
    -ms-flex-wrap: wrap;_x000D_
    flex-wrap: wrap;_x000D_
}_x000D_
_x000D_
.col {_x000D_
    background:red;_x000D_
    border:1px solid black;_x000D_
_x000D_
    -webkit-flex: 1 ;-ms-flex: 1 ;flex: 1 ;_x000D_
}
_x000D_
<div class="wrapper">_x000D_
      _x000D_
    <div class="content">_x000D_
        <div class="row">_x000D_
            <div class="col medium">_x000D_
                <div class="box">_x000D_
                    work on safari browser _x000D_
                </div>_x000D_
            </div>_x000D_
            <div class="col medium">_x000D_
                <div class="box">_x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                </div>_x000D_
            </div>_x000D_
            <div class="col medium">_x000D_
                <div class="box">_x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser _x000D_
                    work on safari browser  work on safari browser _x000D_
                    work on safari browser _x000D_
                </div>_x000D_
            </div>_x000D_
        </div>   _x000D_
    </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Hibernate: best practice to pull all lazy collections

Place the Utils.objectToJson(entity); call before session closing.

Or you can try to set fetch mode and play with code like this

Session s = ...
DetachedCriteria dc = DetachedCriteria.forClass(MyEntity.class).add(Expression.idEq(id));
dc.setFetchMode("innerTable", FetchMode.EAGER);
Criteria c = dc.getExecutableCriteria(s);
MyEntity a = (MyEntity)c.uniqueResult();

Better way to shuffle two numpy arrays in unison

One way in which in-place shuffling can be done for connected lists is using a seed (it could be random) and using numpy.random.shuffle to do the shuffling.

# Set seed to a random number if you want the shuffling to be non-deterministic.
def shuffle(a, b, seed):
   np.random.seed(seed)
   np.random.shuffle(a)
   np.random.seed(seed)
   np.random.shuffle(b)

That's it. This will shuffle both a and b in the exact same way. This is also done in-place which is always a plus.

EDIT, don't use np.random.seed() use np.random.RandomState instead

def shuffle(a, b, seed):
   rand_state = np.random.RandomState(seed)
   rand_state.shuffle(a)
   rand_state.seed(seed)
   rand_state.shuffle(b)

When calling it just pass in any seed to feed the random state:

a = [1,2,3,4]
b = [11, 22, 33, 44]
shuffle(a, b, 12345)

Output:

>>> a
[1, 4, 2, 3]
>>> b
[11, 44, 22, 33]

Edit: Fixed code to re-seed the random state

How do I make the method return type generic?

What you're looking for here is abstraction. Code against interfaces more and you should have to do less casting.

The example below is in C# but the concept remains the same.

using System;
using System.Collections.Generic;
using System.Reflection;

namespace GenericsTest
{
class MainClass
{
    public static void Main (string[] args)
    {
        _HasFriends jerry = new Mouse();
        jerry.AddFriend("spike", new Dog());
        jerry.AddFriend("quacker", new Duck());

        jerry.CallFriend<_Animal>("spike").Speak();
        jerry.CallFriend<_Animal>("quacker").Speak();
    }
}

interface _HasFriends
{
    void AddFriend(string name, _Animal animal);

    T CallFriend<T>(string name) where T : _Animal;
}

interface _Animal
{
    void Speak();
}

abstract class AnimalBase : _Animal, _HasFriends
{
    private Dictionary<string, _Animal> friends = new Dictionary<string, _Animal>();


    public abstract void Speak();

    public void AddFriend(string name, _Animal animal)
    {
        friends.Add(name, animal);
    }   

    public T CallFriend<T>(string name) where T : _Animal
    {
        return (T) friends[name];
    }
}

class Mouse : AnimalBase
{
    public override void Speak() { Squeek(); }

    private void Squeek()
    {
        Console.WriteLine ("Squeek! Squeek!");
    }
}

class Dog : AnimalBase
{
    public override void Speak() { Bark(); }

    private void Bark()
    {
        Console.WriteLine ("Woof!");
    }
}

class Duck : AnimalBase
{
    public override void Speak() { Quack(); }

    private void Quack()
    {
        Console.WriteLine ("Quack! Quack!");
    }
}
}

Youtube autoplay not working on mobile devices with embedded HTML5 player

There is a way to make youtube autoplay, and complete playlists play through. Get Adblock browser for Android, and then go to the youtube website, and and configure it for the desktop version of the page, close Adblock browser out, and then reopen, and you will have the desktop version, where autoplay will work.

Using the desktop version will also mean that AdBlock will work. The mobile version invokes the standalone YouTube player, which is why you want the desktop version of the page, so that autoplay will work, and so ad blocking will work.

Understanding events and event handlers in C#

//This delegate can be used to point to methods
//which return void and take a string.
public delegate void MyDelegate(string foo);

//This event can cause any method which conforms
//to MyEventHandler to be called.
public event MyDelegate MyEvent;

//Here is some code I want to be executed
//when SomethingHappened fires.
void MyEventHandler(string foo)
{
    //Do some stuff
}

//I am creating a delegate (pointer) to HandleSomethingHappened
//and adding it to SomethingHappened's list of "Event Handlers".
myObj.MyEvent += new MyDelegate (MyEventHandler);

Detect if HTML5 Video element is playing

My requirement was to click on the video and pause if it was playing or play if it was paused. This worked for me.

<video id="myVideo" #elem width="320" height="176" autoplay (click)="playIfPaused(elem)">
  <source src="your source" type="video/mp4">
</video>

inside app.component.ts

playIfPaused(file){
    file.paused ? file.play(): file.pause();
}

How to check the presence of php and apache on ubuntu server through ssh

Another way to find out if a program is installed is by using the which command. It will show the path of the program you're searching for. For example if when your searching for apache you can use the following command:

$ which apache2ctl
/usr/sbin/apache2ctl

And if you searching for PHP try this:

$ which php
/usr/bin/php

If the which command doesn't give any result it means the software is not installed (or is not in the current $PATH):

$ which php
$

Differences between time complexity and space complexity?

Sometimes yes they are related, and sometimes no they are not related, actually we sometimes use more space to get faster algorithms as in dynamic programming https://www.codechef.com/wiki/tutorial-dynamic-programming dynamic programming uses memoization or bottom-up, the first technique use the memory to remember the repeated solutions so the algorithm needs not to recompute it rather just get them from a list of solutions. and the bottom-up approach start with the small solutions and build upon to reach the final solution. Here two simple examples, one shows relation between time and space, and the other show no relation: suppose we want to find the summation of all integers from 1 to a given n integer: code1:

sum=0
for i=1 to n
   sum=sum+1
print sum

This code used only 6 bytes from memory i=>2,n=>2 and sum=>2 bytes therefore time complexity is O(n), while space complexity is O(1) code2:

array a[n]
a[1]=1
for i=2 to n
    a[i]=a[i-1]+i
print a[n]

This code used at least n*2 bytes from the memory for the array therefore space complexity is O(n) and time complexity is also O(n)

Print a string as hex bytes?

Just for convenience, very simple.

def hexlify_byteString(byteString, delim="%"):
    ''' very simple way to hexlify a bytestring using delimiters '''
    retval = ""
    for intval in byteString:
        retval += ( '0123456789ABCDEF'[int(intval / 16)])
        retval += ( '0123456789ABCDEF'[int(intval % 16)])
        retval += delim
    return( retval[:-1])

hexlify_byteString(b'Hello World!', ":")
# Out[439]: '48:65:6C:6C:6F:20:57:6F:72:6C:64:21'

UL or DIV vertical scrollbar

Sometimes it is not eligible to set height to pixel values. However, it is possible to show vertical scrollbar through setting height of div to 100% and overflow to auto.

Let me show an example:

<div id="content" style="height: 100%; overflow: auto">
  <p>some text</p>
  <ul>
    <li>text</li>
    .....
    <li>text</li>
</div>

Search all tables, all columns for a specific value SQL Server

I've just updated my blog post to correct the error in the script that you were having Jeff, you can see the updated script here: Search all fields in SQL Server Database

As requested, here's the script in case you want it but I'd recommend reviewing the blog post as I do update it from time to time

DECLARE @SearchStr nvarchar(100)
SET @SearchStr = '## YOUR STRING HERE ##'
 
 
-- Copyright © 2002 Narayana Vyas Kondreddi. All rights reserved.
-- Purpose: To search all columns of all tables for a given search string
-- Written by: Narayana Vyas Kondreddi
-- Site: http://vyaskn.tripod.com
-- Updated and tested by Tim Gaunt
-- http://www.thesitedoctor.co.uk
-- http://blogs.thesitedoctor.co.uk/tim/2010/02/19/Search+Every+Table+And+Field+In+A+SQL+Server+Database+Updated.aspx
-- Tested on: SQL Server 7.0, SQL Server 2000, SQL Server 2005 and SQL Server 2010
-- Date modified: 03rd March 2011 19:00 GMT
CREATE TABLE #Results (ColumnName nvarchar(370), ColumnValue nvarchar(3630))
 
SET NOCOUNT ON
 
DECLARE @TableName nvarchar(256), @ColumnName nvarchar(128), @SearchStr2 nvarchar(110)
SET  @TableName = ''
SET @SearchStr2 = QUOTENAME('%' + @SearchStr + '%','''')
 
WHILE @TableName IS NOT NULL
 
BEGIN
    SET @ColumnName = ''
    SET @TableName = 
    (
        SELECT MIN(QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME))
        FROM     INFORMATION_SCHEMA.TABLES
        WHERE         TABLE_TYPE = 'BASE TABLE'
            AND    QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME) > @TableName
            AND    OBJECTPROPERTY(
                    OBJECT_ID(
                        QUOTENAME(TABLE_SCHEMA) + '.' + QUOTENAME(TABLE_NAME)
                         ), 'IsMSShipped'
                           ) = 0
    )
 
    WHILE (@TableName IS NOT NULL) AND (@ColumnName IS NOT NULL)
         
    BEGIN
        SET @ColumnName =
        (
            SELECT MIN(QUOTENAME(COLUMN_NAME))
            FROM     INFORMATION_SCHEMA.COLUMNS
            WHERE         TABLE_SCHEMA    = PARSENAME(@TableName, 2)
                AND    TABLE_NAME    = PARSENAME(@TableName, 1)
                AND    DATA_TYPE IN ('char', 'varchar', 'nchar', 'nvarchar', 'int', 'decimal')
                AND    QUOTENAME(COLUMN_NAME) > @ColumnName
        )
 
        IF @ColumnName IS NOT NULL
         
        BEGIN
            INSERT INTO #Results
            EXEC
            (
                'SELECT ''' + @TableName + '.' + @ColumnName + ''', LEFT(' + @ColumnName + ', 3630) FROM ' + @TableName + ' (NOLOCK) ' +
                ' WHERE ' + @ColumnName + ' LIKE ' + @SearchStr2
            )
        END
    END   
END
 
SELECT ColumnName, ColumnValue FROM #Results
 
DROP TABLE #Results

How to get access token from FB.login method in javascript SDK

response.session.access_token doesn't work in my code. But this works: response.authResponse.accessToken

     FB.login(function(response) { alert(response.authResponse.accessToken);
     }, {perms:'read_stream,publish_stream,offline_access'});

Add leading zeroes to number in Java?

String.format (https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax)

In your case it will be:

String formatted = String.format("%03d", num);
  • 0 - to pad with zeros
  • 3 - to set width to 3

Set Radiobuttonlist Selected from Codebehind

We can change the item by value, here is the trick:

radio1.ClearSelection();
radio1.Items.FindByValue("1").Selected = true;// 1 is the value of option2

Test file upload using HTTP PUT method

curl -X PUT -T "/path/to/file" "http://myputserver.com/puturl.tmp"

How can I get a resource content from a static context?

For system resources only!

Use

Resources.getSystem().getString(android.R.string.cancel)

You can use them everywhere in your application, even in static constants declarations!

Import pandas dataframe column as string not int

Just want to reiterate this will work in pandas >= 0.9.1:

In [2]: read_csv('sample.csv', dtype={'ID': object})
Out[2]: 
                           ID
0  00013007854817840016671868
1  00013007854817840016749251
2  00013007854817840016754630
3  00013007854817840016781876
4  00013007854817840017028824
5  00013007854817840017963235
6  00013007854817840018860166

I'm creating an issue about detecting integer overflows also.

EDIT: See resolution here: https://github.com/pydata/pandas/issues/2247

Update as it helps others:

To have all columns as str, one can do this (from the comment):

pd.read_csv('sample.csv', dtype = str)

To have most or selective columns as str, one can do this:

# lst of column names which needs to be string
lst_str_cols = ['prefix', 'serial']
# use dictionary comprehension to make dict of dtypes
dict_dtypes = {x : 'str'  for x in lst_str_cols}
# use dict on dtypes
pd.read_csv('sample.csv', dtype=dict_dtypes)

What is better, adjacency lists or adjacency matrices for graph problems in C++?

If you are looking at graph analysis in C++ probably the first place to start would be the boost graph library, which implements a number of algorithms including BFS.

EDIT

This previous question on SO will probably help:

how-to-create-a-c-boost-undirected-graph-and-traverse-it-in-depth-first-search

how to show lines in common (reverse diff)?

Just for information, i made a little tool for Windows doing the same thing than "grep -F -x -f file1 file2" (As i haven't found anything equivalent to this command on Windows)

Here it is : http://www.nerdzcore.com/?page=commonlines

Usage is "CommonLines inputFile1 inputFile2 outputFile"

Source code is also available (GPL)

Find out whether radio button is checked with JQuery?

If you have a group of radio buttons sharing the same name attribute and upon submit or some event you want to check if one of these radio buttons was checked, you can do this simply by the following code :

$(document).ready(function(){
  $('#submit_button').click(function() {
    if (!$("input[name='name']:checked").val()) {
       alert('Nothing is checked!');
        return false;
    }
    else {
      alert('One of the radio buttons is checked!');
    }
  });
});

Source

jQuery API Ref

Checking something isEmpty in Javascript?

This should cover all cases:

function empty( val ) {

    // test results
    //---------------
    // []        true, empty array
    // {}        true, empty object
    // null      true
    // undefined true
    // ""        true, empty string
    // ''        true, empty string
    // 0         false, number
    // true      false, boolean
    // false     false, boolean
    // Date      false
    // function  false

        if (val === undefined)
        return true;

    if (typeof (val) == 'function' || typeof (val) == 'number' || typeof (val) == 'boolean' || Object.prototype.toString.call(val) === '[object Date]')
        return false;

    if (val == null || val.length === 0)        // null or 0 length array
        return true;

    if (typeof (val) == "object") {
        // empty object

        var r = true;

        for (var f in val)
            r = false;

        return r;
    }

    return false;
}

How do include paths work in Visual Studio?

@RichieHindle solution is now deprecated as of Visual Studio 2012. As the VS studio prompt now states:

VC++ Directories are now available as a user property sheet that is added by default to all projects.

To set an include path you now must right-click a project and go to:

Properties/VC++ Directories/General/Include Directories

Screenshot: enter image description here

Select n random rows from SQL Server table

I was using it in subquery and it returned me same rows in subquery

 SELECT  ID ,
            ( SELECT TOP 1
                        ImageURL
              FROM      SubTable 
              ORDER BY  NEWID()
            ) AS ImageURL,
            GETUTCDATE() ,
            1
    FROM    Mytable

then i solved with including parent table variable in where

SELECT  ID ,
            ( SELECT TOP 1
                        ImageURL
              FROM      SubTable 
              Where Mytable.ID>0
              ORDER BY  NEWID()
            ) AS ImageURL,
            GETUTCDATE() ,
            1
    FROM    Mytable

Note the where condtition

Is there a way to do repetitive tasks at intervals?

If you want to stop it in any moment ticker

ticker := time.NewTicker(500 * time.Millisecond)
go func() {
    for range ticker.C {
        fmt.Println("Tick")
    }
}()
time.Sleep(1600 * time.Millisecond)
ticker.Stop()

If you do not want to stop it tick:

tick := time.Tick(500 * time.Millisecond)
for range tick {
    fmt.Println("Tick")
}

How to install Hibernate Tools in Eclipse?

I can't for the life of me get the Next or Finish button to not go grey

This is the eclipse pain in the ass UI. If you unckecked previously some components because they have broken dependencies, it blocks in the license. You have to unselect them in the first step.

Note that avoid to use the update feature of Eclipse it broke all my plugin, I had to delete my ./eclipse folder and reinstall all.

Is there a simple JavaScript slider?

The lightweight MooTools framework has one: http://demos.mootools.net/Slider

How to concatenate a std::string and an int?

In C++20 you'll be able to do:

auto result = std::format("{}{}", name, age);

In the meantime you can use the {fmt} library, std::format is based on:

auto result = fmt::format("{}{}", name, age);

Disclaimer: I'm the author of the {fmt} library and C++20 std::format.

Add line break within tooltips

So if you are using bootstrap4 then this will work.

<style>
   .tooltip-inner {
    white-space: pre-wrap;
   }

</style>

<script> 
    $(function () {
      $('[data-toggle="tooltip"]').tooltip()
    })
</script>

<a data-toggle="tooltip" data-placement="auto" title=" first line &#010; next line" href= ""> Hover me </a>

If you are using in Django project then we can also display dynamic data in tooltips like:

<a class="black-text pb-2 pt-1" data-toggle="tooltip" data-placement="auto"  title="{{ post.location }} &#010; {{ post.updated_on }}" href= "{% url 'blog:get_user_profile' post.author.id %}">{{ post.author }}</a>

"Submit is not a function" error in JavaScript

If you have no opportunity to change name="submit" you can also submit form this way:

function submitForm(form) {
    const submitFormFunction = Object.getPrototypeOf(form).submit;
    submitFormFunction.call(form);
}

Getting Index of an item in an arraylist;

To find the item that has a name, should I just use a for loop, and when the item is found, return the element position in the ArrayList?

Yes to the loop (either using indexes or an Iterator). On the return value, either return its index, or the item iteself, depending on your needs. ArrayList doesn't have an indexOf(Object target, Comparator compare)` or similar. Now that Java is getting lambda expressions (in Java 8, ~March 2014), I expect we'll see APIs get methods that accept lambdas for things like this.

Random shuffling of an array

The most simple solution for this Random Shuffling in an Array.

String location[] = {"delhi","banglore","mathura","lucknow","chandigarh","mumbai"};
int index;
String temp;
Random random = new Random();
for(int i=1;i<location.length;i++)
{
    index = random.nextInt(i+1);
    temp = location[index];
    location[index] = location[i];
    location[i] = temp;
    System.out.println("Location Based On Random Values :"+location[i]);
}

What equivalents are there to TortoiseSVN, on Mac OSX?

My previous version of this answer had links, that kept becoming dead.
So, I've pointed it to the internet archive to preserve the original answer.

Subversion client releases for Windows and Macintosh

Wiki - Subversion clients comparison table

Decoding a Base64 string in Java

Commonly base64 it is used for images. if you like to decode an image (jpg in this example with org.apache.commons.codec.binary.Base64 package):

byte[] decoded = Base64.decodeBase64(imageJpgInBase64);
FileOutputStream fos = null;
fos = new FileOutputStream("C:\\output\\image.jpg");
fos.write(decoded);
fos.close();

What's the difference between HEAD, working tree and index, in Git?

Your working tree is what is actually in the files that you are currently working on.

HEAD is a pointer to the branch or commit that you last checked out, and which will be the parent of a new commit if you make it. For instance, if you're on the master branch, then HEAD will point to master, and when you commit, that new commit will be a descendent of the revision that master pointed to, and master will be updated to point to the new commit.

The index is a staging area where the new commit is prepared. Essentially, the contents of the index are what will go into the new commit (though if you do git commit -a, this will automatically add all changes to files that Git knows about to the index before committing, so it will commit the current contents of your working tree). git add will add or update files from the working tree into your index.

Absolute vs relative URLs

Let's say you have a site www.yourserver.com. In the root directory for web documents you have an images sub-directoy and in that you have myimage.jpg.

An absolute URL defines the exact location of the document, for example:

http://www.yourserver.com/images/myimage.jpg

A relative URL defines the location relative to the current directory, for example, given you are in the root web directory your image is in:

images/myimage.jpg

(relative to that root directory)

You should always use relative URLS where possible. If you move the site to www.anotherserver.com you would have to update all the absolute URLs that were pointing at www.yourserver.com, relative ones will just keep working as is.

How to convert a SVG to a PNG with ImageMagick?

In ImageMagick, one gets a better SVG rendering if one uses Inkscape or RSVG with ImageMagick than its own internal MSVG/XML rendered. RSVG is a delegate that needs to be installed with ImageMagick. If Inkscape is installed on the system, ImageMagick will use it automatically. I use Inkscape in ImageMagick below.

There is no "magic" parameter that will do what you want.

But, one can compute very simply the exact density needed to render the output.

Here is a small 50x50 button when rendered at the default density of 96:

convert button.svg button1.png


enter image description here

Suppose we want the output to be 500. The input is 50 at default density of 96 (older versions of Inkscape may be using 92). So you can compute the needed density in proportion to the ratios of the dimensions and the densities.

512/50 = X/96
X = 96*512/50 = 983


convert -density 983 button.svg button2.png


enter image description here

In ImageMagick 7, you can do the computation in-line as follows:

magick -density "%[fx:96*512/50]" button.svg button3.png

or

in_size=50
in_density=96
out_size=512

magick -density "%[fx:$in_density*$out_size/$in_size]" button.svg button3.png

How to Specify "Vary: Accept-Encoding" header in .htaccess

This was driving me crazy, but it seems that aularon's edit was missing the colon after "Vary". So changing "Vary Accept-Encoding" to "Vary: Accept-Encoding" fixed the issue for me.

I would have commented below the post, but it doesn't seem like it will let me.

Anyhow, I hope this saves someone the same trouble I was having.

What is the best way to generate a unique and short file name in Java

This also works

String logFileName = new SimpleDateFormat("yyyyMMddHHmm'.txt'").format(new Date());

logFileName = "loggerFile_" + logFileName;

align right in a table cell with CSS

Don't forget about CSS3's 'nth-child' selector. If you know the index of the column you wish to align text to the right on, you can just specify

table tr td:nth-child(2) {
    text-align: right;
}

In cases with large tables this can save you a lot of extra markup!

here's a fiddle for ya.... https://jsfiddle.net/w16c2nad/

How to use an output parameter in Java?

This is not accurate ---> "...* pass array. arrays are passed by reference. i.e. if you pass array of integers, modified the array inside the method.

Every parameter type is passed by value in Java. Arrays are object, its object reference is passed by value.

This includes an array of primitives (int, double,..) and objects. The integer value is changed by the methodTwo() but it is still the same arr object reference, the methodTwo() cannot add an array element or delete an array element. methodTwo() cannot also, create a new array then set this new array to arr. If you really can pass an array by reference, you can replace that arr with a brand new array of integers.

Every object passed as parameter in Java is passed by value, no exceptions.

Restricting JTextField input to Integers

You can also use JFormattedTextField, which is much simpler to use. Example:

public static void main(String[] args) {
    NumberFormat format = NumberFormat.getInstance();
    NumberFormatter formatter = new NumberFormatter(format);
    formatter.setValueClass(Integer.class);
    formatter.setMinimum(0);
    formatter.setMaximum(Integer.MAX_VALUE);
    formatter.setAllowsInvalid(false);
    // If you want the value to be committed on each keystroke instead of focus lost
    formatter.setCommitsOnValidEdit(true);
    JFormattedTextField field = new JFormattedTextField(formatter);

    JOptionPane.showMessageDialog(null, field);

    // getValue() always returns something valid
    System.out.println(field.getValue());
}

Difference between OData and REST web services

UPDATE Warning, this answer is extremely out of date now that OData V4 is available.


I wrote a post on the subject a while ago here.

As Franci said, OData is based on Atom Pub. However, they have layered some functionality on top and unfortunately have ignored some of the REST constraints in the process.

The querying capability of an OData service requires you to construct URIs based on information that is not available, or linked to in the response. It is what REST people call out-of-band information and introduces hidden coupling between the client and server.

The other coupling that is introduced is through the use of EDMX metadata to define the properties contained in the entry content. This metadata can be discovered at a fixed endpoint called $metadata. Again, the client needs to know this in advance, it cannot be discovered.

Unfortunately, Microsoft did not see fit to create media types to describe these key pieces of data, so any OData client has to make a bunch of assumptions about the service that it is talking to and the data it is receiving.

Parse XML document in C#

Try this:

XmlDocument doc = new XmlDocument();
doc.Load(@"C:\Path\To\Xml\File.xml");

Or alternatively if you have the XML in a string use the LoadXml method.

Once you have it loaded, you can use SelectNodes and SelectSingleNode to query specific values, for example:

XmlNode node = doc.SelectSingleNode("//Company/Email/text()");
// node.Value contains "[email protected]"

Finally, note that your XML is invalid as it doesn't contain a single root node. It must be something like this:

<Data>
    <Employee>
        <Name>Test</Name>
        <ID>123</ID>
    </Employee>
    <Company>
        <Name>ABC</Name>
        <Email>[email protected]</Email>
    </Company>
</Data>

Getting an "ambiguous redirect" error

If your script's redirect contains a variable, and the script body defines that variable in a section enclosed by parenthesis, you will get the "ambiguous redirect" error. Here's a reproducible example:

  1. vim a.sh to create the script
  2. edit script to contain (logit="/home/ubuntu/test.log" && echo "a") >> ${logit}
  3. chmod +x a.sh to make it executable
  4. a.sh

If you do this, you will get "/home/ubuntu/a.sh: line 1: $logit: ambiguous redirect". This is because

"Placing a list of commands between parentheses causes a subshell to be created, and each of the commands in list to be executed in that subshell, without removing non-exported variables. Since the list is executed in a subshell, variable assignments do not remain in effect after the subshell completes."

From Using parenthesis to group and expand expressions

To correct this, you can modify the script in step 2 to define the variable outside the parenthesis: logit="/home/ubuntu/test.log" && (echo "a") >> $logit

Compiling simple Hello World program on OS X via command line

Use the following for multiple .cpp files

g++ *.cpp
./a.out

How to clear a textbox using javascript

<input type="text" value="A new value" onfocus="this.value='';">

However this will be very irrigating for users that focus the element a second time e.g. to correct something.

Where is the kibana error log? Is there a kibana error log?

Kibana 4 logs to stdout by default. Here is an excerpt of the config/kibana.yml defaults:

# Enables you specify a file where Kibana stores log output.
# logging.dest: stdout

So when invoking it with service, use the log capture method of that service. For example, on a Linux distribution using Systemd / systemctl (e.g. RHEL 7+):

journalctl -u kibana.service

One way may be to modify init scripts to use the --log-file option (if it still exists), but I think the proper solution is to properly configure your instance YAML file. For example, add this to your config/kibana.yml:

logging.dest: /var/log/kibana.log

Note that the Kibana process must be able to write to the file you specify, or the process will die without information (it can be quite confusing).

As for the --log-file option, I think this is reserved for CLI operations, rather than automation.

How can I start PostgreSQL server on Mac OS X?

If your computer was abruptly restarted


You may want to start PostgreSQL server, but it was not.

First, you have to delete the file /usr/local/var/postgres/postmaster.pid. Then you can restart the service using one of the many other mentioned methods depending on your install.

You can verify this by looking at the logs of PostgreSQL to see what might be going on: tail -f /usr/local/var/postgres/server.log

For a specific version:

tail -f /usr/local/var/postgres@[VERSION_NUM]/server.log

For example:

tail -f /usr/local/var/postgres@11/server.log

Xcode stuck on Indexing

It's a Xcode bug (Xcode 8.2.1) and I've reported that to Apple, it will happen when you have a large dictionary literal or a nested dictionary literal. You have to break your dictionary to smaller parts and add them with append method until Apple fixes the bug.

Automatic creation date for Django model form objects?

You can use the auto_now and auto_now_add options for updated_at and created_at respectively.

class MyModel(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

How do I copy a string to the clipboard?

I didn't have a solution, just a workaround.

Windows Vista onwards has an inbuilt command called clip that takes the output of a command from command line and puts it into the clipboard. For example, ipconfig | clip.

So I made a function with the os module which takes a string and adds it to the clipboard using the inbuilt Windows solution.

import os
def addToClipBoard(text):
    command = 'echo ' + text.strip() + '| clip'
    os.system(command)

# Example
addToClipBoard('penny lane')

# Penny Lane is now in your ears, eyes, and clipboard.

As previously noted in the comments however, one downside to this approach is that the echo command automatically adds a newline to the end of your text. To avoid this you can use a modified version of the command:

def addToClipBoard(text):
    command = 'echo | set /p nul=' + text.strip() + '| clip'
    os.system(command)

If you are using Windows XP it will work just following the steps in Copy and paste from Windows XP Pro's command prompt straight to the Clipboard.

How to get the input from the Tkinter Text Widget?

I did come also in search of how to get input data from the Text widget. Regarding the problem with a new line on the end of the string. You can just use .strip() since it is a Text widget that is always a string.

Also, I'm sharing code where you can see how you can create multiply Text widgets and save them in the dictionary as form data, and then by clicking the submit button get that form data and do whatever you want with it. I hope it helps others. It should work in any 3.x python and probably will work in 2.7 also.

from tkinter import *
from functools import partial

class SimpleTkForm(object):
    def __init__(self):
        self.root = Tk()

    def myform(self):
        self.root.title('My form')
        frame = Frame(self.root, pady=10)
        form_data = dict()
        form_fields = ['username', 'password', 'server name', 'database name']
        cnt = 0
        for form_field in form_fields:
            Label(frame, text=form_field, anchor=NW).grid(row=cnt,column=1, pady=5, padx=(10, 1), sticky="W")
            textbox = Text(frame, height=1, width=15)
            form_data.update({form_field: textbox})
            textbox.grid(row=cnt,column=2, pady=5, padx=(3,20))
            cnt += 1

        conn_test = partial(self.test_db_conn, form_data=form_data)
        Button(frame, text='Submit', width=15, command=conn_test).grid(row=cnt,column=2, pady=5, padx=(3,20))
        frame.pack()
        self.root.mainloop()

    def test_db_conn(self, form_data):
        data = {k:v.get('1.0', END).strip() for k,v in form_data.items()}
        # validate data or do anything you want with it
        print(data)


if __name__ == '__main__':
    api = SimpleTkForm()
    api.myform()

Is it possible to install Xcode 10.2 on High Sierra (10.13.6)?

Yes it's possible. Follow these steps:

  1. Download Xcode 10.2 via this link (you need to be signed in with your Apple Id): https://developer.apple.com/services-account/download?path=/Developer_Tools/Xcode_10.2/Xcode_10.2.xip and install it
  2. Edit Xcode.app/Contents/Info.plist and change the Minimum System Version to 10.13.6
  3. Do the same for Xcode.app/Contents/Developer/Applications/Simulator.app/Contents/Info.plist (might require a restart of Xcode and/or Mac OS to make it open the simulator on run)
  4. Replace Xcode.app/Contents/Developer/usr/bin/xcodebuild with the one from 10.1 (or another version you have currently installed, such as 10.0).
  5. If there are problems with the simulator, reboot your Mac

How to call external JavaScript function in HTML

In Layman terms, you need to include external js file in your HTML file & thereafter you could directly call your JS method written in an external js file from HTML page. Follow the code snippet for insight:-

caller.html

<script type="text/javascript" src="external.js"></script>
<input type="button" onclick="letMeCallYou()" value="run external javascript">

external.js

function letMeCallYou()
{
    alert("Bazinga!!!  you called letMeCallYou")
}

Result : enter image description here

Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?

You can use LOG such as :

Log.e(String, String) (error)
Log.w(String, String) (warning)
Log.i(String, String) (information)
Log.d(String, String) (debug)
Log.v(String, String) (verbose)

example code:

private static final String TAG = "MyActivity";
...
Log.i(TAG, "MyClass.getView() — get item number " + position);

How to remove "href" with Jquery?

If you remove the href attribute the anchor will be not focusable and it will look like simple text, but it will still be clickable.

How to increase the execution timeout in php?

To really increase the time limit i prefer to first get the current value. set_time_limit is not always increasing the time limit. If the current value (e.g. from php.ini or formerly set) is higher than the value used in current call of set_time_limit, it will decrease the time limit!

So what's with a small helper like this?

/**
 * @param int $seconds Time in seconds
 * @return bool
 */
function increase_time_limit(int $seconds): bool
{
    return set_time_limit(max(
        ini_get('max_execution_time'), $seconds
    ));
}

// somewhere else in your code
increase_time_limit(180);

See also: Get max_execution_time in PHP script

GetElementByID - Multiple IDs

No, it won't work.

document.getElementById() method accepts only one argument.

However, you may always set classes to the elements and use getElementsByClassName() instead. Another option for modern browsers is to use querySelectorAll() method:

document.querySelectorAll("#myCircle1, #myCircle2, #myCircle3, #myCircle4");

jQuery object equality

Since jQuery 1.6, you can use .is. Below is the answer from over a year ago...

var a = $('#foo');
var b = a;


if (a.is(b)) {
    // the same object!
}

If you want to see if two variables are actually the same object, eg:

var a = $('#foo');
var b = a;

...then you can check their unique IDs. Every time you create a new jQuery object it gets an id.

if ($.data(a) == $.data(b)) {
    // the same object!
}

Though, the same could be achieved with a simple a === b, the above might at least show the next developer exactly what you're testing for.

In any case, that's probably not what you're after. If you wanted to check if two different jQuery objects contain the same set of elements, the you could use this:

$.fn.equals = function(compareTo) {
  if (!compareTo || this.length != compareTo.length) {
    return false;
  }
  for (var i = 0; i < this.length; ++i) {
    if (this[i] !== compareTo[i]) {
      return false;
    }
  }
  return true;
};

Source

var a = $('p');
var b = $('p');
if (a.equals(b)) {
    // same set
}

How to do multiline shell script in Ansible

Ansible uses YAML syntax in its playbooks. YAML has a number of block operators:

  • The > is a folding block operator. That is, it joins multiple lines together by spaces. The following syntax:

    key: >
      This text
      has multiple
      lines
    

    Would assign the value This text has multiple lines\n to key.

  • The | character is a literal block operator. This is probably what you want for multi-line shell scripts. The following syntax:

    key: |
      This text
      has multiple
      lines
    

    Would assign the value This text\nhas multiple\nlines\n to key.

You can use this for multiline shell scripts like this:

- name: iterate user groups
  shell: |
    groupmod -o -g {{ item['guid'] }} {{ item['username'] }} 
    do_some_stuff_here
    and_some_other_stuff
  with_items: "{{ users }}"

There is one caveat: Ansible does some janky manipulation of arguments to the shell command, so while the above will generally work as expected, the following won't:

- shell: |
    cat <<EOF
    This is a test.
    EOF

Ansible will actually render that text with leading spaces, which means the shell will never find the string EOF at the beginning of a line. You can avoid Ansible's unhelpful heuristics by using the cmd parameter like this:

- shell:
    cmd: |
      cat <<EOF
      This is a test.
      EOF

PL/SQL, how to escape single quote in a string?

You can use literal quoting:

stmt := q'[insert into MY_TBL (Col) values('ER0002')]';

Documentation for literals can be found here.

Alternatively, you can use two quotes to denote a single quote:

stmt := 'insert into MY_TBL (Col) values(''ER0002'')';

The literal quoting mechanism with the Q syntax is more flexible and readable, IMO.

Convert a 1D array to a 2D array in numpy

import numpy as np
array = np.arange(8) 
print("Original array : \n", array)
array = np.arange(8).reshape(2, 4)
print("New array : \n", array)

Create XML file using java

You can use Xembly, a small open source library that makes this XML creating process much more intuitive:

String xml = new Xembler(
  new Directives()
    .add("root")
    .add("order")
    .attr("id", "553")
    .set("$140.00")
).xml();

Xembly is a wrapper around native Java DOM, and is a very lightweight library.

How to suppress binary file matching results in grep

There are three options, that you can use. -I is to exclude binary files in grep. Other are for line numbers and file names.

grep -I -n -H 


-I -- process a binary file as if it did not contain matching data; 
-n -- prefix each line of output with the 1-based line number within its input file
-H -- print the file name for each match

So this might be a way to run grep:

grep -InH your-word *

Ansible Ignore errors in tasks and fail at end of the playbook if any tasks had errors

Use Fail module.

  1. Use ignore_errors with every task that you need to ignore in case of errors.
  2. Set a flag (say, result = false) whenever there is a failure in any task execution
  3. At the end of the playbook, check if flag is set, and depending on that, fail the execution
- fail: msg="The execution has failed because of errors."
  when: flag == "failed"

Update:

Use register to store the result of a task like you have shown in your example. Then, use a task like this:

- name: Set flag
  set_fact: flag = failed
  when: "'FAILED' in command_result.stderr"

how to use sqltransaction in c#

You can create a SqlTransaction from a SqlConnection.

And use it to create any number of SqlCommands

SqlTransaction transaction = connection.BeginTransaction();
var cmd1 = new SqlCommand(command1Text, connection, transaction);
var cmd2 = new SqlCommand(command2Text, connection, transaction);

Or

var cmd1 = new SqlCommand(command1Text, connection, connection.BeginTransaction());
var cmd2 = new SqlCommand(command2Text, connection, cmd1.Transaction);

If the failure of commands never cause unexpected changes don't use transaction.

if the failure of commands might cause unexpected changes put them in a Try/Catch block and rollback the operation in another Try/Catch block.

Why another try/catch? According to MSDN:

Try/Catch exception handling should always be used when rolling back a transaction. A Rollback generates an InvalidOperationException if the connection is terminated or if the transaction has already been rolled back on the server.

Here is a sample code:

string connStr = "[connection string]";
string cmdTxt = "[t-sql command text]";

using (var conn = new SqlConnection(connStr))
{
    conn.Open();
    var cmd = new SqlCommand(cmdTxt, conn, conn.BeginTransaction());


    try
    {
        cmd.ExecuteNonQuery();
        //before this line, nothing has happened yet
        cmd.Transaction.Commit();
    }
    catch(System.Exception ex)
    {
        //You should always use a Try/Catch for transaction's rollback
        try
        {
            cmd.Transaction.Rollback();
        }
        catch(System.Exception ex2)
        {
            throw ex2;
        }
        throw ex;
    }

    conn.Close();
}

The transaction is rolled back in the event it is disposed before Commit or Rollback is called.

So you don't need to worry about app being closed.

PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?

XSS will always be there even if you use $_SERVER['HTTP_HOST'], $_SERVER['SERVER_NAME'] OR $_SERVER['PHP_SELF']

MavenError: Failed to execute goal on project: Could not resolve dependencies In Maven Multimodule project

For me, adding the following block of code under <dependency management><dependencies> solved the problem.

<dependency>
    <groupId>org.glassfish</groupId>
    <artifactId>javax.el</artifactId>
    <version>3.0.1-b06</version>
</dependency>

Twitter bootstrap float div right

bootstrap 3 has a class to align the text within a div

<div class="text-right">

will align the text on the right

<div class="pull-right">

will pull to the right all the content not only the text

jQuery Clone table row

Try this variation:

$(".tr_clone_add").live('click', CloneRow);

function CloneRow()
{
    $(this).closest('.tr_clone').clone().insertAfter(".tr_clone:last");
}

How to blur background images in Android

This is an easy way to blur Images Efficiently with Android's RenderScript that I found on this article

  1. Create a Class called BlurBuilder

    public class BlurBuilder {
      private static final float BITMAP_SCALE = 0.4f;
      private static final float BLUR_RADIUS = 7.5f;
    
      public static Bitmap blur(Context context, Bitmap image) {
        int width = Math.round(image.getWidth() * BITMAP_SCALE);
        int height = Math.round(image.getHeight() * BITMAP_SCALE);
    
        Bitmap inputBitmap = Bitmap.createScaledBitmap(image, width, height, false);
        Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
    
        RenderScript rs = RenderScript.create(context);
        ScriptIntrinsicBlur theIntrinsic = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
        Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
        theIntrinsic.setRadius(BLUR_RADIUS);
        theIntrinsic.setInput(tmpIn);
        theIntrinsic.forEach(tmpOut);
        tmpOut.copyTo(outputBitmap);
    
        return outputBitmap;
      }
    }
    
  2. Copy any image to your drawable folder

  3. Use BlurBuilder in your activity like this:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_login);
    
        mContainerView = (LinearLayout) findViewById(R.id.container);
        Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.background);
        Bitmap blurredBitmap = BlurBuilder.blur( this, originalBitmap );
        mContainerView.setBackground(new BitmapDrawable(getResources(), blurredBitmap));
    
  4. Renderscript is included into support v8 enabling this answer down to api 8. To enable it using gradle include these lines into your gradle file (from this answer)

    defaultConfig {
        ...
        renderscriptTargetApi *your target api*
        renderscriptSupportModeEnabled true
    }
    
  5. Result

enter image description here

Using $state methods with $stateChangeStart toState and fromState in Angular ui-router

Suggestion 1

When you add an object to $stateProvider.state that object is then passed with the state. So you can add additional properties which you can read later on when needed.

Example route configuration

$stateProvider
.state('public', {
    abstract: true,
    module: 'public'
})
.state('public.login', {
    url: '/login',
    module: 'public'
})
.state('tool', {
    abstract: true,
    module: 'private'
})
.state('tool.suggestions', {
    url: '/suggestions',
    module: 'private'
});

The $stateChangeStart event gives you acces to the toState and fromState objects. These state objects will contain the configuration properties.

Example check for the custom module property

$rootScope.$on('$stateChangeStart', function(e, toState, toParams, fromState, fromParams) {
    if (toState.module === 'private' && !$cookies.Session) {
        // If logged out and transitioning to a logged in page:
        e.preventDefault();
        $state.go('public.login');
    } else if (toState.module === 'public' && $cookies.Session) {
        // If logged in and transitioning to a logged out page:
        e.preventDefault();
        $state.go('tool.suggestions');
    };
});

I didn't change the logic of the cookies because I think that is out of scope for your question.

Suggestion 2

You can create a Helper to get you this to work more modular.

Value publicStates

myApp.value('publicStates', function(){
    return {
      module: 'public',
      routes: [{
        name: 'login', 
        config: { 
          url: '/login'
        }
      }]
    };
});

Value privateStates

myApp.value('privateStates', function(){
    return {
      module: 'private',
      routes: [{
        name: 'suggestions', 
        config: { 
          url: '/suggestions'
        }
      }]
    };
});

The Helper

myApp.provider('stateshelperConfig', function () {
  this.config = {
    // These are the properties we need to set
    // $stateProvider: undefined
    process: function (stateConfigs){
      var module = stateConfigs.module;
      $stateProvider = this.$stateProvider;
      $stateProvider.state(module, {
        abstract: true,
        module: module
      });
      angular.forEach(stateConfigs, function (route){
        route.config.module = module;
        $stateProvider.state(module + route.name, route.config);
      });
    }
  };

  this.$get = function () {
    return {
      config: this.config
    };
  };
});

Now you can use the helper to add the state configuration to your state configuration.

myApp.config(['$stateProvider', '$urlRouterProvider', 
    'stateshelperConfigProvider', 'publicStates', 'privateStates',
  function ($stateProvider, $urlRouterProvider, helper, publicStates, privateStates) {
    helper.config.$stateProvider = $stateProvider;
    helper.process(publicStates);
    helper.process(privateStates);
}]);

This way you can abstract the repeated code, and come up with a more modular solution.

Note: the code above isn't tested

SqlException: DB2 SQL error: SQLCODE: -302, SQLSTATE: 22001, SQLERRMC: null

As a general point when using a search engine to search for SQL codes make sure you put the sqlcode e.g. -302 in quote marks - like "-302" otherwise the search engine will exclude all search results including the text 302, since the - sign is used to exclude results.

Fetching data from MySQL database using PHP, Displaying it in a form for editing

<?php
 include 'cdb.php';
$show=mysqli_query( $conn,"SELECT *FROM 'reg'");


while($row1= mysqli_fetch_array($show)) 

{

                 $id=$row1['id'];
                $Name= $row1['name'];
                $email = $row1['email'];
                $username = $row1['username'];
                $password= $row1['password'];
                $birthm = $row1['bmonth'];
                $birthd= $row1['bday'];
                $birthy= $row1['byear'];
                $gernder = $row1['gender'];
                $phone= $row1['phone'];
                $image=$row1['image'];
}


?>


<html>
<head><title>hey</head></title></head>

<body>

<form>
<table border="-2" bgcolor="pink" style="width: 12px; height: 100px;" >

    <th>
    id<input type="text" name="" style="width: 30px;" value= "<?php echo $row1['id']; ?>"  >
</th>

<br>
<br>

    <th>

 name <input type="text" name=""  style="width: 60px;" value= "<?php echo $row1['Name']; ?>" >
</th>

<th>
 email<input type="text" name="" style="width: 60px;" value= "<?php echo $row1['email']; ?>"  >
</th>
<th>
    username<input type="hidden" name="" style="width: 60px;"  value= "<?php echo $username['email']; ?>" >
</th>
<th>
    password<input type="hidden" name="" style="width: 60px;"  value= "<?php echo $row1['password']; ?>">
</ths>

<th>
    birthday month<input type="text" name="" style="width: 60px;"  value= "<?php echo $row1['birthm']; ?>">
</th>
<th>
   birthday day<input type="text" name="" style="width: 60px;"  value= "<?php echo $row1['birthd']; ?>">
</th>
<th>
       birthday year<input type="text" name="" style="width: 60px;" value= "<?php echo $row1['birthy']; ?>" >
</th>
<th>
    gender<input type="text" name="" style="width: 60px;" value= "<?php echo $row1['gender']; ?>">
</th>
<th>
    phone number<input type="text" name="" style="width: 60px;" value= "<?php echo $row1['phone']; ?>">
</th>
<th>
    <th>
     image<input type="text" name="" style="width: 60px;"  value= "<?php echo $row1['image']; ?>">
</th>

<th>

<font color="pink"> <a href="update.php">update</a></font>

</th>
</table>

</body>
</form>
</body>
</html>

What is the difference between parseInt(string) and Number(string) in JavaScript?

Addendum to @sjngm's answer:

They both also ignore whitespace:

var foo = " 3 "; console.log(parseInt(foo)); // 3 console.log(Number(foo)); // 3

It is not exactly correct. As sjngm wrote parseInt parses string to first number. It is true. But the problem is when you want to parse number separated with whitespace ie. "12 345". In that case
parseInt("12 345") will return 12 instead of 12345. So to avoid that situation you must trim whitespaces before parsing to number. My solution would be:

     var number=parseInt("12 345".replace(/\s+/g, ''),10);

Notice one extra thing I used in parseInt() function. parseInt("string",10) will set the number to decimal format. If you would parse string like "08" you would get 0 because 8 is not a octal number.Explanation is here

Getting RAW Soap Data from a Web Reference Client running in ASP.net

I would prefer to have the framework do the logging for you by hooking in a logging stream which logs as the framework processes that underlying stream. The following isn't as clean as I would like it, since you can't decide between request and response in the ChainStream method. The following is how I handle it. With thanks to Jon Hanna for the overriding a stream idea

public class LoggerSoapExtension : SoapExtension
{
    private static readonly string LOG_DIRECTORY = ConfigurationManager.AppSettings["LOG_DIRECTORY"];
    private LogStream _logger;

    public override object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute)
    {
        return null;
    }
    public override object GetInitializer(Type serviceType)
    {
        return null;
    }
    public override void Initialize(object initializer)
    {
    }
    public override System.IO.Stream ChainStream(System.IO.Stream stream)
    {
        _logger = new LogStream(stream);
        return _logger;
    }
    public override void ProcessMessage(SoapMessage message)
    {
        if (LOG_DIRECTORY != null)
        {
            switch (message.Stage)
            {
                case SoapMessageStage.BeforeSerialize:
                    _logger.Type = "request";
                    break;
                case SoapMessageStage.AfterSerialize:
                    break;
                case SoapMessageStage.BeforeDeserialize:
                    _logger.Type = "response";
                    break;
                case SoapMessageStage.AfterDeserialize:
                    break;
            }
        }
    }
    internal class LogStream : Stream
    {
        private Stream _source;
        private Stream _log;
        private bool _logSetup;
        private string _type;

        public LogStream(Stream source)
        {
            _source = source;
        }
        internal string Type
        {
            set { _type = value; }
        }
        private Stream Logger
        {
            get
            {
                if (!_logSetup)
                {
                    if (LOG_DIRECTORY != null)
                    {
                        try
                        {
                            DateTime now = DateTime.Now;
                            string folder = LOG_DIRECTORY + now.ToString("yyyyMMdd");
                            string subfolder = folder + "\\" + now.ToString("HH");
                            string client = System.Web.HttpContext.Current != null && System.Web.HttpContext.Current.Request != null && System.Web.HttpContext.Current.Request.UserHostAddress != null ? System.Web.HttpContext.Current.Request.UserHostAddress : string.Empty;
                            string ticks = now.ToString("yyyyMMdd'T'HHmmss.fffffff");
                            if (!Directory.Exists(folder))
                                Directory.CreateDirectory(folder);
                            if (!Directory.Exists(subfolder))
                                Directory.CreateDirectory(subfolder);
                            _log = new FileStream(new System.Text.StringBuilder(subfolder).Append('\\').Append(client).Append('_').Append(ticks).Append('_').Append(_type).Append(".xml").ToString(), FileMode.Create);
                        }
                        catch
                        {
                            _log = null;
                        }
                    }
                    _logSetup = true;
                }
                return _log;
            }
        }
        public override bool CanRead
        {
            get
            {
                return _source.CanRead;
            }
        }
        public override bool CanSeek
        {
            get
            {
                return _source.CanSeek;
            }
        }

        public override bool CanWrite
        {
            get
            {
                return _source.CanWrite;
            }
        }

        public override long Length
        {
            get
            {
                return _source.Length;
            }
        }

        public override long Position
        {
            get
            {
                return _source.Position;
            }
            set
            {
                _source.Position = value;
            }
        }

        public override void Flush()
        {
            _source.Flush();
            if (Logger != null)
                Logger.Flush();
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            return _source.Seek(offset, origin);
        }

        public override void SetLength(long value)
        {
            _source.SetLength(value);
        }

        public override int Read(byte[] buffer, int offset, int count)
        {
            count = _source.Read(buffer, offset, count);
            if (Logger != null)
                Logger.Write(buffer, offset, count);
            return count;
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            _source.Write(buffer, offset, count);
            if (Logger != null)
                Logger.Write(buffer, offset, count);
        }
        public override int ReadByte()
        {
            int ret = _source.ReadByte();
            if (ret != -1 && Logger != null)
                Logger.WriteByte((byte)ret);
            return ret;
        }
        public override void Close()
        {
            _source.Close();
            if (Logger != null)
                Logger.Close();
            base.Close();
        }
        public override int ReadTimeout
        {
            get { return _source.ReadTimeout; }
            set { _source.ReadTimeout = value; }
        }
        public override int WriteTimeout
        {
            get { return _source.WriteTimeout; }
            set { _source.WriteTimeout = value; }
        }
    }
}
[AttributeUsage(AttributeTargets.Method)]
public class LoggerSoapExtensionAttribute : SoapExtensionAttribute
{
    private int priority = 1;
    public override int Priority
    {
        get
        {
            return priority;
        }
        set
        {
            priority = value;
        }
    }
    public override System.Type ExtensionType
    {
        get
        {
            return typeof(LoggerSoapExtension);
        }
    }
}

MVC3 DropDownListFor - a simple example?

     @Html.DropDownListFor(m => m.SelectedValue,Your List,"ID","Values")

Here Value is that object of model where you want to save your Selected Value

Passing variables in remote ssh command

Escape the variable in order to access variables outside of the ssh session: ssh [email protected] "~/tools/myScript.pl \$BUILD_NUMBER"

Where to change default pdf page width and font size in jspdf.debug.js?

For anyone trying to this in react. There is a slight difference.

// Document of 8.5 inch width and 11 inch high
new jsPDF('p', 'in', [612, 792]);

or

// Document of 8.5 inch width and 11 inch high
new jsPDF({
        orientation: 'p', 
        unit: 'in', 
        format: [612, 792]
});

When i tried the @Aidiakapi solution the pages were tiny. For a difference size take size in inches * 72 to get the dimensions you need. For example, i wanted 8.5 so 8.5 * 72 = 612. This is for [email protected].

How to use QTimer

mytimer.h:

    #ifndef MYTIMER_H
    #define MYTIMER_H

    #include <QTimer>

    class MyTimer : public QObject
    {
        Q_OBJECT
    public:
        MyTimer();
        QTimer *timer;

    public slots:
        void MyTimerSlot();
    };

    #endif // MYTIME

mytimer.cpp:

#include "mytimer.h"
#include <QDebug>

MyTimer::MyTimer()
{
    // create a timer
    timer = new QTimer(this);

    // setup signal and slot
    connect(timer, SIGNAL(timeout()),
          this, SLOT(MyTimerSlot()));

    // msec
    timer->start(1000);
}

void MyTimer::MyTimerSlot()
{
    qDebug() << "Timer...";
}

main.cpp:

#include <QCoreApplication>
#include "mytimer.h"

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // Create MyTimer instance
    // QTimer object will be created in the MyTimer constructor
    MyTimer timer;

    return a.exec();
}

If we run the code:

Timer...
Timer...
Timer...
Timer...
Timer...
...

resources

SQL DELETE with INNER JOIN

If the database is InnoDB then it might be a better idea to use foreign keys and cascade on delete, this would do what you want and also result in no redundant data being stored.

For this example however I don't think you need the first s:

DELETE s 
FROM spawnlist AS s 
INNER JOIN npc AS n ON s.npc_templateid = n.idTemplate 
WHERE n.type = "monster";

It might be a better idea to select the rows before deleting so you are sure your deleting what you wish to:

SELECT * FROM spawnlist
INNER JOIN npc ON spawnlist.npc_templateid = npc.idTemplate
WHERE npc.type = "monster";

You can also check the MySQL delete syntax here: http://dev.mysql.com/doc/refman/5.0/en/delete.html

React - How to force a function component to render?

You can now, using React hooks

Using react hooks, you can now call useState() in your function component.

useState() will return an array of 2 things:

  1. A value, representing the current state.
  2. Its setter. Use it to update the value.

Updating the value by its setter will force your function component to re-render,
just like forceUpdate does:

import React, { useState } from 'react';

//create your forceUpdate hook
function useForceUpdate(){
    const [value, setValue] = useState(0); // integer state
    return () => setValue(value => value + 1); // update the state to force render
}

function MyComponent() {
    // call your hook here
    const forceUpdate = useForceUpdate();
    
    return (
        <div>
            {/*Clicking on the button will force to re-render like force update does */}
            <button onClick={forceUpdate}>
                Click to re-render
            </button>
        </div>
    );
}

You can find a demo here.

The component above uses a custom hook function (useForceUpdate) which uses the react state hook useState. It increments the component's state's value and thus tells React to re-render the component.

EDIT

In an old version of this answer, the snippet used a boolean value, and toggled it in forceUpdate(). Now that I've edited my answer, the snippet use a number rather than a boolean.

Why ? (you would ask me)

Because once it happened to me that my forceUpdate() was called twice subsequently from 2 different events, and thus it was reseting the boolean value at its original state, and the component never rendered.

This is because in the useState's setter (setValue here), React compare the previous state with the new one, and render only if the state is different.

ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden

I recently had this error and found that the problem was caused by the feature "HTTP Redirection" not being enabled on my Windows Server. This blog post helped me get through troubleshooting to find the answer (despite being older Windows Server versions): http://blogs.msdn.com/b/rjacobs/archive/2010/06/30/system-web-routing-routetable-not-working-with-iis.aspx for newer servers go to Computer management, then scroll down to the Web Server role and click add role services

How to display an alert box from C# in ASP.NET?

After insertion code,

ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Record Inserted Successfully')", true);

fatal: git-write-tree: error building trees

maybe there are some unmerged paths in your git repository that you have to resolve before stashing.

Difference between const reference and normal parameter

There are three methods you can pass values in the function

  1. Pass by value

    void f(int n){
        n = n + 10;
    }
    
    int main(){
        int x = 3;
        f(x);
        cout << x << endl;
    }
    

    Output: 3. Disadvantage: When parameter x pass through f function then compiler creates a copy in memory in of x. So wastage of memory.

  2. Pass by reference

    void f(int& n){
        n = n + 10;
    }
    
    int main(){
        int x = 3;
        f(x);
        cout << x << endl;
    }
    

    Output: 13. It eliminate pass by value disadvantage, but if programmer do not want to change the value then use constant reference

  3. Constant reference

    void f(const int& n){
        n = n + 10; // Error: assignment of read-only reference  ‘n’
    }
    
    int main(){
        int x = 3;
        f(x);
        cout << x << endl;
    }
    

    Output: Throw error at n = n + 10 because when we pass const reference parameter argument then it is read-only parameter, you cannot change value of n.

How to rotate the background image in the container?

I was looking to do this also. I have a large tile (literally an image of a tile) image which I'd like to rotate by just roughly 15 degrees and have repeated. You can imagine the size of an image which would repeat seamlessly, rendering the 'image editing program' answer useless.

My solution was give the un-rotated (just one copy :) tile image to psuedo :before element - oversize it - repeat it - set the container overflow to hidden - and rotate the generated :before element using css3 transforms. Bosh!

google chrome extension :: console.log() from background page?

Try this, if you want to log to the active page's console:

chrome.tabs.executeScript({
    code: 'console.log("addd")'
});

Change primary key column in SQL Server

Necromancing.
It looks you have just as good a schema to work with as me... Here is how to do it correctly:

In this example, the table name is dbo.T_SYS_Language_Forms, and the column name is LANG_UID

-- First, chech if the table exists...
IF 0 < (
    SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES 
    WHERE TABLE_TYPE = 'BASE TABLE'
    AND TABLE_SCHEMA = 'dbo'
    AND TABLE_NAME = 'T_SYS_Language_Forms'
)
BEGIN
    -- Check for NULL values in the primary-key column
    IF 0 = (SELECT COUNT(*) FROM T_SYS_Language_Forms WHERE LANG_UID IS NULL)
    BEGIN
        ALTER TABLE T_SYS_Language_Forms ALTER COLUMN LANG_UID uniqueidentifier NOT NULL 

        -- No, don't drop, FK references might already exist...
        -- Drop PK if exists 
        -- ALTER TABLE T_SYS_Language_Forms DROP CONSTRAINT pk_constraint_name 
        --DECLARE @pkDropCommand nvarchar(1000) 
        --SET @pkDropCommand = N'ALTER TABLE T_SYS_Language_Forms DROP CONSTRAINT ' + QUOTENAME((SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
        --WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' 
        --AND TABLE_SCHEMA = 'dbo' 
        --AND TABLE_NAME = 'T_SYS_Language_Forms' 
        ----AND CONSTRAINT_NAME = 'PK_T_SYS_Language_Forms' 
        --))
        ---- PRINT @pkDropCommand 
        --EXECUTE(@pkDropCommand) 

        -- Instead do
        -- EXEC sp_rename 'dbo.T_SYS_Language_Forms.PK_T_SYS_Language_Forms1234565', 'PK_T_SYS_Language_Forms';


        -- Check if they keys are unique (it is very possible they might not be) 
        IF 1 >= (SELECT TOP 1 COUNT(*) AS cnt FROM T_SYS_Language_Forms GROUP BY LANG_UID ORDER BY cnt DESC)
        BEGIN

            -- If no Primary key for this table
            IF 0 =  
            (
                SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS 
                WHERE CONSTRAINT_TYPE = 'PRIMARY KEY' 
                AND TABLE_SCHEMA = 'dbo' 
                AND TABLE_NAME = 'T_SYS_Language_Forms' 
                -- AND CONSTRAINT_NAME = 'PK_T_SYS_Language_Forms' 
            )
                ALTER TABLE T_SYS_Language_Forms ADD CONSTRAINT PK_T_SYS_Language_Forms PRIMARY KEY CLUSTERED (LANG_UID ASC)
            ;

            -- Adding foreign key
            IF 0 = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS WHERE CONSTRAINT_NAME = 'FK_T_ZO_SYS_Language_Forms_T_SYS_Language_Forms') 
                ALTER TABLE T_ZO_SYS_Language_Forms WITH NOCHECK ADD CONSTRAINT FK_T_ZO_SYS_Language_Forms_T_SYS_Language_Forms FOREIGN KEY(ZOLANG_LANG_UID) REFERENCES T_SYS_Language_Forms(LANG_UID); 
        END -- End uniqueness check
        ELSE
            PRINT 'FSCK, this column has duplicate keys, and can thus not be changed to primary key...' 
    END -- End NULL check
    ELSE
        PRINT 'FSCK, need to figure out how to update NULL value(s)...' 
END 

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

You need junit-dep.jar because the junit.jar has a copy of old Hamcrest classes.

How to easily initialize a list of Tuples?

Why do like tuples? It's like anonymous types: no names. Can not understand structure of data.

I like classic classes

class FoodItem
{
     public int Position { get; set; }
     public string Name { get; set; }
}

List<FoodItem> list = new List<FoodItem>
{
     new FoodItem { Position = 1, Name = "apple" },
     new FoodItem { Position = 2, Name = "kiwi" }
};

How to create batch file in Windows using "start" with a path and command with spaces

Escaping the path with apostrophes is correct, but the start command takes a parameter containing the title of the new window. This parameter is detected by the surrounding apostrophes, so your application is not executed.

Try something like this:

start "Dummy Title" "c:\path with spaces\app.exe" param1 "param with spaces"

Reading string from input with space character?

scanf(" %[^\t\n]s",&str);

str is the variable in which you are getting the string from.

How to change the bootstrap primary color?

This is a very easy solution.

<h4 class="card-header bg-dark text-white text-center">Renew your Membership</h4>

replace the class bg-dark, with bg-custom.

In CSS

.bg-custom {
  background-color: red;
}

Where is web.xml in Eclipse Dynamic Web Project

The web.xml file should be listed right below the last line in your screenshot and resides in WebContent/WEB-INF. If it is missing you might have missed to check the "Generate web.xml deployment descriptor" option on the third page of the Dynamic web project wizard.

How to use mouseover and mouseout in Angular 6

You can use (mouseover) and (mouseout) events.

component.ts

changeText:boolean=true;

component.html

<div (mouseover)="changeText=true" (mouseout)="changeText=false">
  <span [hidden]="changeText">Hide</span>
  <span [hidden]="!changeText">Show</span>
</div>

Best Practices for securing a REST API / web service

I've used OAuth a few times, and also used some other methods (BASIC/DIGEST). I wholeheartedly suggest OAuth. The following link is the best tutorial I've seen on using OAuth:

http://hueniverse.com/oauth/guide/

Difference between natural join and inner join

A natural join is just a shortcut to avoid typing, with a presumption that the join is simple and matches fields of the same name.

SELECT
  *
FROM
  table1
NATURAL JOIN
  table2
    -- implicitly uses `room_number` to join

Is the same as...

SELECT
  *
FROM
  table1
INNER JOIN
  table2
    ON table1.room_number = table2.room_number

What you can't do with the shortcut format, however, is more complex joins...

SELECT
  *
FROM
  table1
INNER JOIN
  table2
    ON (table1.room_number = table2.room_number)
    OR (table1.room_number IS NULL AND table2.room_number IS NULL)

Scikit-learn train_test_split with indices

The docs mention train_test_split is just a convenience function on top of shuffle split.

I just rearranged some of their code to make my own example. Note the actual solution is the middle block of code. The rest is imports, and setup for a runnable example.

from sklearn.model_selection import ShuffleSplit
from sklearn.utils import safe_indexing, indexable
from itertools import chain
import numpy as np
X = np.reshape(np.random.randn(20),(10,2)) # 10 training examples
y = np.random.randint(2, size=10) # 10 labels
seed = 1

cv = ShuffleSplit(random_state=seed, test_size=0.25)
arrays = indexable(X, y)
train, test = next(cv.split(X=X))
iterator = list(chain.from_iterable((
    safe_indexing(a, train),
    safe_indexing(a, test),
    train,
    test
    ) for a in arrays)
)
X_train, X_test, train_is, test_is, y_train, y_test, _, _  = iterator

print(X)
print(train_is)
print(X_train)

Now I have the actual indexes: train_is, test_is

C# using streams

There is only one basic type of Stream. However in various circumstances some members will throw an exception when called because in that context the operation was not available.

For example a MemoryStream is simply a way to moves bytes into and out of a chunk of memory. Hence you can call Read and Write on it.

On the other hand a FileStream allows you to read or write (or both) from/to a file. Whether you can actually Read or Write depends on how the file was opened. You can't Write to a file if you only opened it for Read access.

How do I set a program to launch at startup

I found adding a shortcut to the startup folder to be the easiest way for me. I had to add a reference to "Windows Script Host Object Model" and "Microsoft.CSharp" and then used this code:

IWshRuntimeLibrary.WshShell shell = new IWshRuntimeLibrary.WshShell();
string shortcutAddress = Environment.GetFolderPath(Environment.SpecialFolder.Startup) + @"\MyAppName.lnk";
System.Reflection.Assembly curAssembly = System.Reflection.Assembly.GetExecutingAssembly();

IWshRuntimeLibrary.IWshShortcut shortcut = (IWshRuntimeLibrary.IWshShortcut)shell.CreateShortcut(shortcutAddress);
shortcut.Description = "My App Name";
shortcut.WorkingDirectory = AppDomain.CurrentDomain.BaseDirectory;
shortcut.TargetPath = curAssembly.Location;
shortcut.IconLocation = AppDomain.CurrentDomain.BaseDirectory + @"MyIconName.ico";
shortcut.Save();

What's the difference between .NET Core, .NET Framework, and Xamarin?

  1. .NET is the Ecosystem based on c# language
  2. .NET Standard is Standard (in other words, specification) of .NET Ecosystem .

.Net Core Class Library is built upon the .Net Standard. .NET Standard you can make only class-library project that cannot be executed standalone and should be referenced by another .NET Core or .NET Framework executable project.If you want to implement a library that is portable to the .Net Framework, .Net Core and Xamarin, choose a .Net Standard Library

  1. .NET Framework is a framework based on .NET and it supports Windows and Web applications

(You can make executable project (like Console application, or ASP.NET application) with .NET Framework

  1. ASP.NET is a web application development technology which is built over the .NET Framework
  2. .NET Core also a framework based on .NET.

It is the new open-source and cross-platform framework to build applications for all operating system including Windows, Mac, and Linux.

  1. Xamarin is a framework to develop a cross platform mobile application(iOS, Android, and Windows Mobile) using C#

Implementation support of .NET Standard[blue] and minimum viable platform for full support of .NET Standard (latest: [https://docs.microsoft.com/en-us/dotnet/standard/net-standard#net-implementation-support])

Disable cache for some images

Solution 1 is not great. It does work, but adding hacky random or timestamped query strings to the end of your image files will make the browser re-download and cache every version of every image, every time a page is loaded, regardless of weather the image has changed or not on the server.

Solution 2 is useless. Adding nocache headers to an image file is not only very difficult to implement, but it's completely impractical because it requires you to predict when it will be needed in advance, the first time you load any image which you think might change at some point in the future.

Enter Etags...

The absolute best way I've found to solve this is to use ETAGS inside a .htaccess file in your images directory. The following tells Apache to send a unique hash to the browser in the image file headers. This hash only ever changes when time the image file is modified and this change triggers the browser to reload the image the next time it is requested.

<FilesMatch "\.(jpg|jpeg)$">
FileETag MTime Size
</FilesMatch>

Adding an onclicklistener to listview (android)

You are doing

Object o = prestListView.getItemAtPosition(position);
String str=(String)o;//As you are using Default String Adapter

The o that you get back is not a String, but a prestationEco so you get a CCE when doing the (String)o

Create a 3D matrix

If you want to define a 3D matrix containing all zeros, you write

A = zeros(8,4,20);

All ones uses ones, all NaN's uses NaN, all false uses false instead of zeros.

If you have an existing 2D matrix, you can assign an element in the "3rd dimension" and the matrix is augmented to contain the new element. All other new matrix elements that have to be added to do that are set to zero.

For example

B = magic(3); %# creates a 3x3 magic square
B(2,1,2) = 1; %# and you have a 3x3x2 array

How to increase timeout for a single test case in mocha

If you are using in NodeJS then you can set timeout in package.json

"test": "mocha --timeout 10000"

then you can run using npm like:

npm test

Draw a line in a div

No need for css, you can just use the HR tag from HTML

<hr />

CSS text-decoration underline color

You can't change the color of the line (you can't specify different foreground colors for the same element, and the text and its decoration form a single element). However there are some tricks:

a:link, a:visited {text-decoration: none; color: red; border-bottom: 1px solid #006699; }
a:hover, a:active {text-decoration: none; color: red; border-bottom: 1px solid #1177FF; }

Also you can make some cool effects this way:

a:link {text-decoration: none; color: red; border-bottom: 1px dashed #006699; }

Hope it helps.

VBA Excel Provide current Date in Text box

Set the value from code on showing the form, not in the design-timeProperties for the text box.

Private Sub UserForm_Activate()
    Me.txtDate.Value = Format(Date, "mm/dd/yy")
End Sub

where to place CASE WHEN column IS NULL in this query

Not able to understand your actual problem but your case statement is incorrect

CASE 
WHEN 
TABLE3.COL3 IS NULL
THEN TABLE2.COL3
ELSE
TABLE3.COL3
END 
AS
COL4

How do you set a default value for a MySQL Datetime column?

While you can't do this with DATETIME in the default definition, you can simply incorporate a select statement in your insert statement like this:

INSERT INTO Yourtable (Field1, YourDateField) VALUES('val1', (select now()))

Note the lack of quotes around the table.

For MySQL 5.5

HttpContext.Current.Session is null when routing requests

Nice job! I've been having the exact same problem. Adding and removing the Session module worked perfectly for me too. It didn't however bring back by HttpContext.Current.User so I tried your little trick with the FormsAuth module and sure enough, that did it.

<remove name="FormsAuthentication" />
<add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule"/>

git ignore exception

You can simply git add -f path/to/foo.dll.

.gitignore ignores only files for usual tracking and stuff like git add .

Changing cursor to waiting in javascript/jquery

Here is something else interesting you can do. Define a function to call just before each ajax call. Also assign a function to call after each ajax call is complete. The first function will set the wait cursor and the second will clear it. They look like the following:

$(document).ajaxComplete(function(event, request, settings) {
    $('*').css('cursor', 'default');
  });

function waitCursor() {
    $('*').css('cursor', 'progress');
  }

Reading a string with spaces with sscanf

If you want to scan to the end of the string (stripping out a newline if there), just use:

char *x = "19 cool kid";
sscanf (x, "%d %[^\n]", &age, buffer);

That's because %s only matches non-whitespace characters and will stop on the first whitespace it finds. The %[^\n] format specifier will match every character that's not (because of ^) in the selection given (which is a newline). In other words, it will match any other character.


Keep in mind that you should have allocated enough space in your buffer to take the string since you cannot be sure how much will be read (a good reason to stay away from scanf/fscanf unless you use specific field widths).

You could do that with:

char *x = "19 cool kid";
char *buffer = malloc (strlen (x) + 1);
sscanf (x, "%d %[^\n]", &age, buffer);

(you don't need * sizeof(char) since that's always 1 by definition).

How to solve : SQL Error: ORA-00604: error occurred at recursive SQL level 1

I noticed following line from error.

exact fetch returns more than requested number of rows

That means Oracle was expecting one row but It was getting multiple rows. And, only dual table has that characteristic, which returns only one row.

Later I recall, I have done few changes in dual table and when I executed dual table. Then found multiple rows.

So, I truncated dual table and inserted only row which X value. And, everything working fine.

Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf (LoadError)

For WSL (Windows Subsystem for Linux) you need install build-essential package:

sudo apt install build-essential

#1071 - Specified key was too long; max key length is 1000 bytes

This index size limit seems to be larger on 64 bit builds of MySQL.

I was hitting this limitation trying to dump our dev database and load it on a local VMWare virt. Finally I realized that the remote dev server was 64 bit and I had created a 32 bit virt. I just created a 64 bit virt and I was able to load the database locally.

How do I use Linq to obtain a unique list of properties from a list of objects?

        int[] numbers = {1,2,3,4,5,3,6,4,7,8,9,1,0 };
        var nonRepeats = (from n in numbers select n).Distinct();


        foreach (var d in nonRepeats)
        {

            Response.Write(d);
        }

OUTPUT

1234567890

Create a <ul> and fill it based on a passed array

You may also consider the following solution:

let sum = options.set0.concat(options.set1);
const codeHTML = '<ol>' + sum.reduce((html, item) => {
    return html + "<li>" + item + "</li>";
        }, "") + '</ol>';
document.querySelector("#list").innerHTML = codeHTML;

What does "zend_mm_heap corrupted" mean

In my case, the cause for this error was one of the arrays was becoming very big. I've set my script to reset the array on every iteration and that sorted the problem.

How do I use $rootScope in Angular to store variables?

angular.module('myApp').controller('myCtrl', function($scope, $rootScope) {
   var a = //something in the scope
   //put it in the root scope
    $rootScope.test = "TEST";
 });

angular.module('myApp').controller('myCtrl2', function($scope, $rootScope) {
   var b = //get var a from root scope somehow
   //use var b

   $scope.value = $rootScope.test;
   alert($scope.value);

 //    var b = $rootScope.test;
 //  alert(b);
 });

DEMO

What's the shebang/hashbang (#!) in Facebook and new Twitter URLs for?

I always assumed the ! just indicated that the hash fragment that followed corresponded to a URL, with ! taking the place of the site root or domain. It could be anything, in theory, but it seems the Google AJAX Crawling API likes it this way.

The hash, of course, just indicates that no real page reload is occurring, so yes, it’s for AJAX purposes. Edit: Raganwald does a lovely job explaining this in more detail.

BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly

adding the following lines to my /etc/environment file worked

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

CR LF notepad++ removal

"View -> Show Symbol -> uncheck Show All characters" may not work if you have pending update for notepad++. So update Notepad++ and then View -> Show Symbol -> uncheck Show All characters

Hope this is helpful!

What is code coverage and how do YOU measure it?

Just remember, having "100% code-coverage" doesn't mean everything is tested completely - while it means every line of code is tested, it doesn't mean they are tested under every (common) situation..

I would use code-coverage to highlight bits of code that I should probably write tests for. For example, if whatever code-coverage tool shows myImportantFunction() isn't executed while running my current unit-tests, they should probably be improved.

Basically, 100% code-coverage doesn't mean your code is perfect. Use it as a guide to write more comprehensive (unit-)tests.

What is the use of rt.jar file in java?

Your question is already answered here :

Basically, rt.jar contains all of the compiled class files for the base Java Runtime ("rt") Environment. Normally, javac should know the path to this file

Also, a good link on what happens if we try to include our class file in rt.jar.

Create a git patch from the uncommitted changes in the current working directory

If you want to do binary, give a --binary option when you run git diff.

How to speed up insertion performance in PostgreSQL

See populate a database in the PostgreSQL manual, depesz's excellent-as-usual article on the topic, and this SO question.

(Note that this answer is about bulk-loading data into an existing DB or to create a new one. If you're interested DB restore performance with pg_restore or psql execution of pg_dump output, much of this doesn't apply since pg_dump and pg_restore already do things like creating triggers and indexes after it finishes a schema+data restore).

There's lots to be done. The ideal solution would be to import into an UNLOGGED table without indexes, then change it to logged and add the indexes. Unfortunately in PostgreSQL 9.4 there's no support for changing tables from UNLOGGED to logged. 9.5 adds ALTER TABLE ... SET LOGGED to permit you to do this.

If you can take your database offline for the bulk import, use pg_bulkload.

Otherwise:

  • Disable any triggers on the table

  • Drop indexes before starting the import, re-create them afterwards. (It takes much less time to build an index in one pass than it does to add the same data to it progressively, and the resulting index is much more compact).

  • If doing the import within a single transaction, it's safe to drop foreign key constraints, do the import, and re-create the constraints before committing. Do not do this if the import is split across multiple transactions as you might introduce invalid data.

  • If possible, use COPY instead of INSERTs

  • If you can't use COPY consider using multi-valued INSERTs if practical. You seem to be doing this already. Don't try to list too many values in a single VALUES though; those values have to fit in memory a couple of times over, so keep it to a few hundred per statement.

  • Batch your inserts into explicit transactions, doing hundreds of thousands or millions of inserts per transaction. There's no practical limit AFAIK, but batching will let you recover from an error by marking the start of each batch in your input data. Again, you seem to be doing this already.

  • Use synchronous_commit=off and a huge commit_delay to reduce fsync() costs. This won't help much if you've batched your work into big transactions, though.

  • INSERT or COPY in parallel from several connections. How many depends on your hardware's disk subsystem; as a rule of thumb, you want one connection per physical hard drive if using direct attached storage.

  • Set a high checkpoint_segments value and enable log_checkpoints. Look at the PostgreSQL logs and make sure it's not complaining about checkpoints occurring too frequently.

  • If and only if you don't mind losing your entire PostgreSQL cluster (your database and any others on the same cluster) to catastrophic corruption if the system crashes during the import, you can stop Pg, set fsync=off, start Pg, do your import, then (vitally) stop Pg and set fsync=on again. See WAL configuration. Do not do this if there is already any data you care about in any database on your PostgreSQL install. If you set fsync=off you can also set full_page_writes=off; again, just remember to turn it back on after your import to prevent database corruption and data loss. See non-durable settings in the Pg manual.

You should also look at tuning your system:

  • Use good quality SSDs for storage as much as possible. Good SSDs with reliable, power-protected write-back caches make commit rates incredibly faster. They're less beneficial when you follow the advice above - which reduces disk flushes / number of fsync()s - but can still be a big help. Do not use cheap SSDs without proper power-failure protection unless you don't care about keeping your data.

  • If you're using RAID 5 or RAID 6 for direct attached storage, stop now. Back your data up, restructure your RAID array to RAID 10, and try again. RAID 5/6 are hopeless for bulk write performance - though a good RAID controller with a big cache can help.

  • If you have the option of using a hardware RAID controller with a big battery-backed write-back cache this can really improve write performance for workloads with lots of commits. It doesn't help as much if you're using async commit with a commit_delay or if you're doing fewer big transactions during bulk loading.

  • If possible, store WAL (pg_xlog) on a separate disk / disk array. There's little point in using a separate filesystem on the same disk. People often choose to use a RAID1 pair for WAL. Again, this has more effect on systems with high commit rates, and it has little effect if you're using an unlogged table as the data load target.

You may also be interested in Optimise PostgreSQL for fast testing.

How to concatenate strings with padding in sqlite

The || operator is "concatenate" - it joins together the two strings of its operands.

From http://www.sqlite.org/lang_expr.html

For padding, the seemingly-cheater way I've used is to start with your target string, say '0000', concatenate '0000423', then substr(result, -4, 4) for '0423'.

Update: Looks like there is no native implementation of "lpad" or "rpad" in SQLite, but you can follow along (basically what I proposed) here: http://verysimple.com/2010/01/12/sqlite-lpad-rpad-function/

-- the statement below is almost the same as
-- select lpad(mycolumn,'0',10) from mytable

select substr('0000000000' || mycolumn, -10, 10) from mytable

-- the statement below is almost the same as
-- select rpad(mycolumn,'0',10) from mytable

select substr(mycolumn || '0000000000', 1, 10) from mytable

Here's how it looks:

SELECT col1 || '-' || substr('00'||col2, -2, 2) || '-' || substr('0000'||col3, -4, 4)

it yields

"A-01-0001"
"A-01-0002"
"A-12-0002"
"C-13-0002"
"B-11-0002"

How do I debug a stand-alone VBScript script?

Click the mse7.exe installed along with Office typically at \Program Files\Microsoft Office\OFFICE11.

This will open up the debugger, open the file and then run the debugger in the GUI mode.

Is JVM ARGS '-Xms1024m -Xmx2048m' still useful in Java 8?

Due to PermGen removal some options were removed (like -XX:MaxPermSize), but options -Xms and -Xmx work in Java 8. It's possible that under Java 8 your application simply needs somewhat more memory. Try to increase -Xmx value. Alternatively you can try to switch to G1 garbage collector using -XX:+UseG1GC.

Note that if you use any option which was removed in Java 8, you will see a warning upon application start:

$ java -XX:MaxPermSize=128M -version
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128M; support was removed in 8.0
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

Enum String Name from Value

i have used this code given below

 CustomerType = ((EnumCustomerType)(cus.CustomerType)).ToString()

Command line for looking at specific port

In RHEL 7, I use this command to filter several ports in LISTEN State:

sudo netstat -tulpn | grep LISTEN | egrep '(8080 |8082 |8083 | etc )'

What are projection and selection?

Simply PROJECTION deals with elimination or selection of columns, while SELECTION deals with elimination or selection of rows.

"Parameter not valid" exception loading System.Drawing.Image

The "parameter is not valid" exception thrown by Image.FromStream() tells you that the stream is not a 'valid' or 'recognised' format. Watch the memory streams, especially if you are taking various offsets of bytes from a file.

// 1. Create a junk memory stream, pass it to Image.FromStream and 
// get the "parameter is not valid":
MemoryStream ms = new MemoryStream(new Byte[] {0x00, 0x01, 0x02});
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);`

// 2. Create a junk memory stream, pass it to Image.FromStream
// without verification:
MemoryStream ms = new MemoryStream(new Byte[] {0x00, 0x01, 0x02});
System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms, false, true);

Example 2 will work, note that useEmbeddedColorManagement must be false for validateImageData to be valid.

May be easiest to debug by dumping the memory stream to a file and inspecting the content.

How to install OpenSSL in windows 10?

Either set the openssl present in Git as your default openssl and include that into your path in environmental variables (quick way)

OR

  1. Install the system-specific openssl from this link.
  2. set the following variable : set OPENSSL_CONF=LOCATION_OF_SSL_INSTALL\bin\openssl.cfg
  3. Update the path : set Path=...Other Values here...;LOCATION_OF_SSL_INSTALL\bin

Getting "project" nuget configuration is invalid error

Simply restarting Visual Studio worked for me.

Removing duplicates from rows based on specific columns in an RDD/Spark DataFrame

This is my Df contain 4 is repeated twice so here will remove repeated values.

scala> df.show
+-----+
|value|
+-----+
|    1|
|    4|
|    3|
|    5|
|    4|
|   18|
+-----+

scala> val newdf=df.dropDuplicates

scala> newdf.show
+-----+
|value|
+-----+
|    1|
|    3|
|    5|
|    4|
|   18|
+-----+

Enter triggers button click

You can use javascript to block form submission until the appropriate time. A very crude example:

<form onsubmit='return false;' id='frmNoEnterSubmit' action="index.html">

    <input type='text' name='txtTest' />

    <input type='button' value='Submit' 
        onclick='document.forms["frmNoEnterSubmit"].onsubmit=""; document.forms["frmNoEnterSubmit"].submit();' />

</form>

Pressing enter will still trigger the form to submit, but the javascript will keep it from actually submitting, until you actually press the button.

How can I output a UTF-8 CSV in PHP that Excel will read properly?

EASY solution for Mac Excel 2008: I struggled with this soo many times, but here was my easy fix: Open the .csv file in Textwrangler which should open your UTF-8 chars correctly. Now in the bottom status bar change the file format from "Unicode (UTF-8)" to "Western (ISO Latin 1)" and save the file. Now go to your Mac Excel 2008 and select File > Import > Select csv > Find your file > in File origin select "Windows (ANSI)" and voila the UTF-8 chars are showing correctly. At least it does for me...

Find unique lines

You could also print out the unique value in "file" using the cat command by piping to sort and uniq

cat file | sort | uniq -u

Including JavaScript class definition from another file in Node.js

I just want to point out that most of the answers here don't work, I am new to NodeJS and IDK if throughout time the "module.exports.yourClass" method changed, or if people just entered the wrong answer.

// MyClass

module.exports.Ninja = class Ninja{
    test(){
        console.log('TESTING 1... 2... 3...');
    };
}
//Using MyClass in seprate File


const ninjaFw = require('./NinjaFw');

let ninja = new ninjaFw.Ninja();
ninja.test();

  • This is the method I am currently using. I like this syntax, becuase module.exports sits on the same line as the class declaration and that cleans the code up a little imo. The other way you can do it is like this:
//  Ninja Framework File


class Ninja{
    test(){
        console.log('TESTING 1... 2... 3...');
    };
}


module.exports.Ninja = Ninja;

  • Two different syntax but, in the end, the same result. Just a matter of syntax anesthetics.

ActionBarActivity: cannot be resolved to a type

Add this line to dependencies in build.gradle:

dependencies {
compile 'com.android.support:appcompat-v7:18.0.+'
}

Reference

What is 'PermSize' in Java?

lace to store your loaded class definition and metadata. If a large code-base project is loaded, the insufficient Perm Gen size will cause the popular Java.Lang.OutOfMemoryError: PermGen.

Illegal pattern character 'T' when parsing a date string to java.util.Date

Update for Java 8 and higher

You can now simply do Instant.parse("2015-04-28T14:23:38.521Z") and get the correct thing now, especially since you should be using Instant instead of the broken java.util.Date with the most recent versions of Java.

You should be using DateTimeFormatter instead of SimpleDateFormatter as well.

Original Answer:

The explanation below is still valid as as what the format represents. But it was written before Java 8 was ubiquitous so it uses the old classes that you should not be using if you are using Java 8 or higher.

This works with the input with the trailing Z as demonstrated:

In the pattern the T is escaped with ' on either side.

The pattern for the Z at the end is actually XXX as documented in the JavaDoc for SimpleDateFormat, it is just not very clear on actually how to use it since Z is the marker for the old TimeZone information as well.

Q2597083.java

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

public class Q2597083
{
    /**
     * All Dates are normalized to UTC, it is up the client code to convert to the appropriate TimeZone.
     */
    public static final TimeZone UTC;

    /**
     * @see <a href="http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations">Combined Date and Time Representations</a>
     */
    public static final String ISO_8601_24H_FULL_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX";

    /**
     * 0001-01-01T00:00:00.000Z
     */
    public static final Date BEGINNING_OF_TIME;

    /**
     * 292278994-08-17T07:12:55.807Z
     */
    public static final Date END_OF_TIME;

    static
    {
        UTC = TimeZone.getTimeZone("UTC");
        TimeZone.setDefault(UTC);
        final Calendar c = new GregorianCalendar(UTC);
        c.set(1, 0, 1, 0, 0, 0);
        c.set(Calendar.MILLISECOND, 0);
        BEGINNING_OF_TIME = c.getTime();
        c.setTime(new Date(Long.MAX_VALUE));
        END_OF_TIME = c.getTime();
    }

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

        final SimpleDateFormat sdf = new SimpleDateFormat(ISO_8601_24H_FULL_FORMAT);
        sdf.setTimeZone(UTC);
        System.out.println("sdf.format(BEGINNING_OF_TIME) = " + sdf.format(BEGINNING_OF_TIME));
        System.out.println("sdf.format(END_OF_TIME) = " + sdf.format(END_OF_TIME));
        System.out.println("sdf.format(new Date()) = " + sdf.format(new Date()));
        System.out.println("sdf.parse(\"2015-04-28T14:23:38.521Z\") = " + sdf.parse("2015-04-28T14:23:38.521Z"));
        System.out.println("sdf.parse(\"0001-01-01T00:00:00.000Z\") = " + sdf.parse("0001-01-01T00:00:00.000Z"));
        System.out.println("sdf.parse(\"292278994-08-17T07:12:55.807Z\") = " + sdf.parse("292278994-08-17T07:12:55.807Z"));
    }
}

Produces the following output:

sdf.format(BEGINNING_OF_TIME) = 0001-01-01T00:00:00.000Z
sdf.format(END_OF_TIME) = 292278994-08-17T07:12:55.807Z
sdf.format(new Date()) = 2015-04-28T14:38:25.956Z
sdf.parse("2015-04-28T14:23:38.521Z") = Tue Apr 28 14:23:38 UTC 2015
sdf.parse("0001-01-01T00:00:00.000Z") = Sat Jan 01 00:00:00 UTC 1
sdf.parse("292278994-08-17T07:12:55.807Z") = Sun Aug 17 07:12:55 UTC 292278994

Android Endless List

I know its an old question and the Android world has mostly moved on to RecyclerViews, but for anyone interested, you may find this library very interesting.

It uses the BaseAdapter used with the ListView to detect when the list has been scrolled to the last item or when it is being scrolled away from the last item.

It comes with an example project(barely 100 lines of Activity code) that can be used to quickly understand how it works.

Simple usage:

class Boy{

private String name;
private double height;
private int age;
//Other code

}

An adapter to hold Boy objects would look like:


public class BoysAdapter extends EndlessAdapter<Boy>{




        ViewHolder holder = null;


        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(parent
                    .getContext());

            holder = new ViewHolder();

            convertView = inflater.inflate(
                    R.layout.list_cell, parent, false);


            holder.nameView = convertView.findViewById(R.id.cell);

            // minimize the default image.
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Boy boy = getItem(position);

        try {
            holder.nameView.setText(boy.getName());

            ///Other data rendering codes.

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

        return super.getView(position,convertView,parent);

}

Notice how the BoysAdapter's getView method returns a call to the EndlessAdapter superclass's getView method. This is 100% essential.

Now to create the adapter, do:

   adapter = new ModelAdapter() {
            @Override
            public void onScrollToBottom(int bottomIndex, boolean moreItemsCouldBeAvailable) {

                if (moreItemsCouldBeAvailable) { 
                    makeYourServerCallForMoreItems();
                } else {
                    if (loadMore.getVisibility() != View.VISIBLE) {
                        loadMore.setVisibility(View.VISIBLE);
                    }
                }
            }

            @Override
            public void onScrollAwayFromBottom(int currentIndex) { 
                loadMore.setVisibility(View.GONE);
            }

            @Override
            public void onFinishedLoading(boolean moreItemsReceived) { 
                if (!moreItemsReceived) {
                    loadMore.setVisibility(View.VISIBLE);
                }
            }
        };

The loadMore item is a button or other ui element that may be clicked to fetch more data from the url. When placed as described in the code, the adapter knows exactly when to show that button and when to disable it. Just create the button in your xml and place it as shown in the adapter code above.

Enjoy.

Get path to execution directory of Windows Forms application

Private Sub Main_Shown(sender As Object, e As EventArgs) Handles Me.Shown
    Dim args() As String = Environment.GetCommandLineArgs()
    If args.Length > 0 Then
        TextBox1.Text = Path.GetFullPath(Application.ExecutablePath)
        Process.Start(TextBox1.Text)   
    End If
End Sub

Force IE8 Into IE7 Compatiblity Mode

This can be done in IIS: http://weblogs.asp.net/joelvarty/archive/2009/03/23/force-ie7-compatibility-mode-in-ie8-with-iis-settings.aspx

Read the comments as well: Wednesday, April 01, 2009 8:57 AM by John Moore

A quick follow-up. This worked great for my site as long as I use the IE=EmulateIE7 value. Trying to use the IE=7 resulted in my site essentially hanging when run on IE8.

Angular 5 Button Submit On Enter Key Press

Another alternative can be to execute the Keydown or KeyUp in the tag of the Form

<form name="nameForm" [formGroup]="groupForm" (keydown.enter)="executeFunction()" >

android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database

Another thing to note is Environment.getExternalStorageDirectory() has been deprecated in API 29, so change this if you're using this to get the database path:

https://developer.android.com/reference/android/os/Environment#getExternalStorageDirectory()

This method was deprecated in API level 29.

To improve user privacy, direct access to shared/external storage devices is deprecated. When an app targets Build.VERSION_CODES.Q, the path returned from this method is no longer directly accessible to apps. Apps can continue to access content stored on shared/external storage by migrating to alternatives such as Context#getExternalFilesDir(String), MediaStore, or Intent#ACTION_OPEN_DOCUMENT.

How to set username and password for SmtpClient object in .NET?

SmtpClient MyMail = new SmtpClient();
MailMessage MyMsg = new MailMessage();
MyMail.Host = "mail.eraygan.com";
MyMsg.Priority = MailPriority.High;
MyMsg.To.Add(new MailAddress(Mail));
MyMsg.Subject = Subject;
MyMsg.SubjectEncoding = Encoding.UTF8;
MyMsg.IsBodyHtml = true;
MyMsg.From = new MailAddress("username", "displayname");
MyMsg.BodyEncoding = Encoding.UTF8;
MyMsg.Body = Body;
MyMail.UseDefaultCredentials = false;
NetworkCredential MyCredentials = new NetworkCredential("username", "password");
MyMail.Credentials = MyCredentials;
MyMail.Send(MyMsg);

SQL left join vs multiple tables on FROM line?

The old syntax, with just listing the tables, and using the WHERE clause to specify the join criteria, is being deprecated in most modern databases.

It's not just for show, the old syntax has the possibility of being ambiguous when you use both INNER and OUTER joins in the same query.

Let me give you an example.

Let's suppose you have 3 tables in your system:

Company
Department
Employee

Each table contain numerous rows, linked together. You got multiple companies, and each company can have multiple departments, and each department can have multiple employees.

Ok, so now you want to do the following:

List all the companies, and include all their departments, and all their employees. Note that some companies don't have any departments yet, but make sure you include them as well. Make sure you only retrieve departments that have employees, but always list all companies.

So you do this:

SELECT * -- for simplicity
FROM Company, Department, Employee
WHERE Company.ID *= Department.CompanyID
  AND Department.ID = Employee.DepartmentID

Note that the last one there is an inner join, in order to fulfill the criteria that you only want departments with people.

Ok, so what happens now. Well, the problem is, it depends on the database engine, the query optimizer, indexes, and table statistics. Let me explain.

If the query optimizer determines that the way to do this is to first take a company, then find the departments, and then do an inner join with employees, you're not going to get any companies that don't have departments.

The reason for this is that the WHERE clause determines which rows end up in the final result, not individual parts of the rows.

And in this case, due to the left join, the Department.ID column will be NULL, and thus when it comes to the INNER JOIN to Employee, there's no way to fulfill that constraint for the Employee row, and so it won't appear.

On the other hand, if the query optimizer decides to tackle the department-employee join first, and then do a left join with the companies, you will see them.

So the old syntax is ambiguous. There's no way to specify what you want, without dealing with query hints, and some databases have no way at all.

Enter the new syntax, with this you can choose.

For instance, if you want all companies, as the problem description stated, this is what you would write:

SELECT *
FROM Company
     LEFT JOIN (
         Department INNER JOIN Employee ON Department.ID = Employee.DepartmentID
     ) ON Company.ID = Department.CompanyID

Here you specify that you want the department-employee join to be done as one join, and then left join the results of that with the companies.

Additionally, let's say you only want departments that contains the letter X in their name. Again, with old style joins, you risk losing the company as well, if it doesn't have any departments with an X in its name, but with the new syntax, you can do this:

SELECT *
FROM Company
     LEFT JOIN (
         Department INNER JOIN Employee ON Department.ID = Employee.DepartmentID
     ) ON Company.ID = Department.CompanyID AND Department.Name LIKE '%X%'

This extra clause is used for the joining, but is not a filter for the entire row. So the row might appear with company information, but might have NULLs in all the department and employee columns for that row, because there is no department with an X in its name for that company. This is hard with the old syntax.

This is why, amongst other vendors, Microsoft has deprecated the old outer join syntax, but not the old inner join syntax, since SQL Server 2005 and upwards. The only way to talk to a database running on Microsoft SQL Server 2005 or 2008, using the old style outer join syntax, is to set that database in 8.0 compatibility mode (aka SQL Server 2000).

Additionally, the old way, by throwing a bunch of tables at the query optimizer, with a bunch of WHERE clauses, was akin to saying "here you are, do the best you can". With the new syntax, the query optimizer has less work to do in order to figure out what parts goes together.

So there you have it.

LEFT and INNER JOIN is the wave of the future.

Calculating Time Difference

The datetime module will do all the work for you:

>>> import datetime
>>> a = datetime.datetime.now()
>>> # ...wait a while...
>>> b = datetime.datetime.now()
>>> print(b-a)
0:03:43.984000

If you don't want to display the microseconds, just use (as gnibbler suggested):

>>> a = datetime.datetime.now().replace(microsecond=0)
>>> b = datetime.datetime.now().replace(microsecond=0)
>>> print(b-a)
0:03:43

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

So you have to exclude conflict dependencies. Try this:

<exclusions>
  <exclusion> 
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
  </exclusion>
  <exclusion> 
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
  </exclusion>
</exclusions> 

This solved same problem with slf4j and Dozer.

How to append text to a text file in C++?

You could also do it like this

#include <fstream>

int main(){   
std::ofstream ost {outputfile, std::ios_base::app};

ost.open(outputfile);
ost << "something you want to add to your outputfile";
ost.close();
return 0;
}

JQuery add class to parent element

$(this.parentNode).addClass('newClass');

ImportError: No module named pandas

It might be too late to answer this but I just had the problem and I kept installing and uninstalling, it turns out the the problem happens when you're installing pandas to a version of python and trying to run the program using another python version

So to start off, run:

which python
python --version
which pip

make sure both are aligned, most probably, python is 2.7 and pip is working on 3.x or pip is coming from anaconda's python version which is highly likely to be 3.x as well

Incase of python redirects to 2.7, and pip redirects to pip3, install pandas using pip install pandas and use python3 file_name.py to run the program.

Ajax Upload image

HTML Code

<div class="rCol"> 
     <div id ="prv" style="height:auto; width:auto; float:left; margin-bottom: 28px; margin-left: 200px;"></div>
       </div>
    <div class="rCol" style="clear:both;">

    <label > Upload Photo : </label> 
    <input type="file" id="file" name='file' onChange=" return submitForm();">
    <input type="hidden" id="filecount" value='0'>

Here is Ajax Code:

function submitForm() {

    var fcnt = $('#filecount').val();
    var fname = $('#filename').val();
    var imgclean = $('#file');
    if(fcnt<=5)
    {
    data = new FormData();
    data.append('file', $('#file')[0].files[0]);

    var imgname  =  $('input[type=file]').val();
     var size  =  $('#file')[0].files[0].size;

    var ext =  imgname.substr( (imgname.lastIndexOf('.') +1) );
    if(ext=='jpg' || ext=='jpeg' || ext=='png' || ext=='gif' || ext=='PNG' || ext=='JPG' || ext=='JPEG')
    {
     if(size<=1000000)
     {
    $.ajax({
      url: "<?php echo base_url() ?>/upload.php",
      type: "POST",
      data: data,
      enctype: 'multipart/form-data',
      processData: false,  // tell jQuery not to process the data
      contentType: false   // tell jQuery not to set contentType
    }).done(function(data) {
       if(data!='FILE_SIZE_ERROR' || data!='FILE_TYPE_ERROR' )
       {
        fcnt = parseInt(fcnt)+1;
        $('#filecount').val(fcnt);
        var img = '<div class="dialog" id ="img_'+fcnt+'" ><img src="<?php echo base_url() ?>/local_cdn/'+data+'"><a href="#" id="rmv_'+fcnt+'" onclick="return removeit('+fcnt+')" class="close-classic"></a></div><input type="hidden" id="name_'+fcnt+'" value="'+data+'">';
        $('#prv').append(img);
        if(fname!=='')
        {
          fname = fname+','+data;
        }else
        {
          fname = data;
        }
         $('#filename').val(fname);
          imgclean.replaceWith( imgclean = imgclean.clone( true ) );
       }
       else
       {
         imgclean.replaceWith( imgclean = imgclean.clone( true ) );
         alert('SORRY SIZE AND TYPE ISSUE');
       }

    });
    return false;
  }//end size
  else
  {
      imgclean.replaceWith( imgclean = imgclean.clone( true ) );//Its for reset the value of file type
    alert('Sorry File size exceeding from 1 Mb');
  }
  }//end FILETYPE
  else
  {
     imgclean.replaceWith( imgclean = imgclean.clone( true ) );
    alert('Sorry Only you can uplaod JPEG|JPG|PNG|GIF file type ');
  }
  }//end filecount
  else
  {    imgclean.replaceWith( imgclean = imgclean.clone( true ) );
     alert('You Can not Upload more than 6 Photos');
  }
}

Here is PHP code :

$filetype = array('jpeg','jpg','png','gif','PNG','JPEG','JPG');
   foreach ($_FILES as $key )
    {

          $name =time().$key['name'];

          $path='local_cdn/'.$name;
          $file_ext =  pathinfo($name, PATHINFO_EXTENSION);
          if(in_array(strtolower($file_ext), $filetype))
          {
            if($key['name']<1000000)
            {

             @move_uploaded_file($key['tmp_name'],$path);
             echo $name;

            }
           else
           {
               echo "FILE_SIZE_ERROR";
           }
        }
        else
        {
            echo "FILE_TYPE_ERROR";
        }// Its simple code.Its not with proper validation.

Here upload and preview part done.Now if you want to delete and remove image from page and folder both then code is here for deletion. Ajax Part:

function removeit (arg) {
       var id  = arg;
       // GET FILE VALUE
       var fname = $('#filename').val();
       var fcnt = $('#filecount').val();
        // GET FILE VALUE

       $('#img_'+id).remove();
       $('#rmv_'+id).remove();
       $('#img_'+id).css('display','none');

        var dname  =  $('#name_'+id).val();
        fcnt = parseInt(fcnt)-1;
        $('#filecount').val(fcnt);
        var fname = fname.replace(dname, "");
        var fname = fname.replace(",,", "");
        $('#filename').val(fname);
        $.ajax({
          url: 'delete.php',
          type: 'POST',
          data:{'name':dname},
          success:function(a){
            console.log(a);
            }
        });
    } 

Here is PHP part(delete.php):

$path='local_cdn/'.$_POST['name'];

   if(@unlink($path))
   {
     echo "Success";
   }
   else
   {
     echo "Failed";
   }

event.returnValue is deprecated. Please use the standard event.preventDefault() instead

If you using Bootstrap:

The current version of Bootstrap (3.0.2) (with jQuery 1.10.2 & Chrome) seems to generate this warning as well.

(It does so on Twitter too, BTW.)

Update

The current version of Bootstrap (3.1.0) no longer seems to generate this warning.

Getting Image from API in Angular 4/5+?

You should set responseType: ResponseContentType.Blob in your GET-Request settings, because so you can get your image as blob and convert it later da base64-encoded source. You code above is not good. If you would like to do this correctly, then create separate service to get images from API. Beacuse it ism't good to call HTTP-Request in components.

Here is an working example:

Create image.service.ts and put following code:

Angular 4:

getImage(imageUrl: string): Observable<File> {
    return this.http
        .get(imageUrl, { responseType: ResponseContentType.Blob })
        .map((res: Response) => res.blob());
}

Angular 5+:

getImage(imageUrl: string): Observable<Blob> {
  return this.httpClient.get(imageUrl, { responseType: 'blob' });
}

Important: Since Angular 5+ you should use the new HttpClient.

The new HttpClient returns JSON by default. If you need other response type, so you can specify that by setting responseType: 'blob'. Read more about that here.

Now you need to create some function in your image.component.ts to get image and show it in html.

For creating an image from Blob you need to use JavaScript's FileReader. Here is function which creates new FileReader and listen to FileReader's load-Event. As result this function returns base64-encoded image, which you can use in img src-attribute:

imageToShow: any;

createImageFromBlob(image: Blob) {
   let reader = new FileReader();
   reader.addEventListener("load", () => {
      this.imageToShow = reader.result;
   }, false);

   if (image) {
      reader.readAsDataURL(image);
   }
}

Now you should use your created ImageService to get image from api. You should to subscribe to data and give this data to createImageFromBlob-function. Here is an example function:

getImageFromService() {
      this.isImageLoading = true;
      this.imageService.getImage(yourImageUrl).subscribe(data => {
        this.createImageFromBlob(data);
        this.isImageLoading = false;
      }, error => {
        this.isImageLoading = false;
        console.log(error);
      });
}

Now you can use your imageToShow-variable in HTML template like this:

<img [src]="imageToShow"
     alt="Place image title"
     *ngIf="!isImageLoading; else noImageFound">
<ng-template #noImageFound>
     <img src="fallbackImage.png" alt="Fallbackimage">
</ng-template>

I hope this description is clear to understand and you can use it in your project.

See the working example for Angular 5+ here.

Is it possible to make input fields read-only through CSS?

This is not possible with css, but I have used one css trick in one of my website, please check if this works for you.

The trick is: wrap the input box with a div and make it relative, place a transparent image inside the div and make it absolute over the input text box, so that no one can edit it.

css

.txtBox{
    width:250px;
    height:25px;
    position:relative;
}
.txtBox input{
    width:250px;
    height:25px;
}
.txtBox img{
    position:absolute;
    top:0;
    left:0
}

html

<div class="txtBox">
<input name="" type="text" value="Text Box" />
<img src="http://dev.w3.org/2007/mobileok-ref/test/data/ROOT/GraphicsForSpacingTest/1/largeTransparent.gif" width="250" height="25" alt="" />
</div>

jsFiddle File

Excel formula to get cell color

No, you can only get to the interior color of a cell by using a Macro. I am afraid. It's really easy to do (cell.interior.color) so unless you have a requirement that restricts you from using VBA, I say go for it.

How can I escape a double quote inside double quotes?

A simple example of escaping quotes in the shell:

$ echo 'abc'\''abc'
abc'abc
$ echo "abc"\""abc"
abc"abc

It's done by finishing an already-opened one ('), placing the escaped one (\'), and then opening another one (').

Alternatively:

$ echo 'abc'"'"'abc'
abc'abc
$ echo "abc"'"'"abc"
abc"abc

It's done by finishing already opened one ('), placing a quote in another quote ("'"), and then opening another one (').

More examples: Escaping single-quotes within single-quoted strings

Unique random string generation

  • not sure Microsoft's link are randomly generated
  • have a look to new Guid().ToString()

How do I run Python code from Sublime Text 2?

Edit %APPDATA%\Sublime Text 2\Python\Python.sublime-build

Change content to:

{
    "cmd": ["C:\\python27\\python.exe", "-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python"
}

change the "c:\python27" part to any version of python you have in your system.

Python, creating objects

Create a class and give it an __init__ method:

class Student:
    def __init__(self, name, age, major):
        self.name = name
        self.age = age
        self.major = major

    def is_old(self):
        return self.age > 100

Now, you can initialize an instance of the Student class:

>>> s = Student('John', 88, None)
>>> s.name
    'John'
>>> s.age
    88

Although I'm not sure why you need a make_student student function if it does the same thing as Student.__init__.

How to set 24-hours format for date on java?

Try below code

    String dateStr = "Jul 27, 2011 8:35:29 PM";
    DateFormat readFormat = new SimpleDateFormat( "MMM dd, yyyy hh:mm:ss aa");
    DateFormat writeFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss");
    Date date = null;
    try {
       date = readFormat.parse( dateStr );
    } catch ( ParseException e ) {
        e.printStackTrace();
    }

    String formattedDate = "";
    if( date != null ) {
    formattedDate = writeFormat.format( date );
    }

    System.out.println(formattedDate);

Good Luck!!!

Check for various formats.

What's a .sh file?

open the location in terminal then type these commands 1. chmod +x filename.sh 2. ./filename.sh that's it

Generate preview image from Video file?

Solution #1 (Older) (not recommended)

Firstly install ffmpeg-php project (http://ffmpeg-php.sourceforge.net/)

And then you can use of this simple code:

<?php
$frame = 10;
$movie = 'test.mp4';
$thumbnail = 'thumbnail.png';

$mov = new ffmpeg_movie($movie);
$frame = $mov->getFrame($frame);
if ($frame) {
    $gd_image = $frame->toGDImage();
    if ($gd_image) {
        imagepng($gd_image, $thumbnail);
        imagedestroy($gd_image);
        echo '<img src="'.$thumbnail.'">';
    }
}
?>

Description: This project use binary extension .so file, It's very old and last update was for 2008. So, maybe don't works with newer version of FFMpeg or PHP.


Solution #2 (Update 2018) (recommended)

Firstly install PHP-FFMpeg project (https://github.com/PHP-FFMpeg/PHP-FFMpeg)
(just run for install: composer require php-ffmpeg/php-ffmpeg)

And then you can use of this simple code:

<?php
require 'vendor/autoload.php';

$sec = 10;
$movie = 'test.mp4';
$thumbnail = 'thumbnail.png';

$ffmpeg = FFMpeg\FFMpeg::create();
$video = $ffmpeg->open($movie);
$frame = $video->frame(FFMpeg\Coordinate\TimeCode::fromSeconds($sec));
$frame->save($thumbnail);
echo '<img src="'.$thumbnail.'">';

Description: It's newer and more modern project and works with latest version of FFMpeg and PHP. Note that it's required to proc_open() PHP function.

Perform an action in every sub-directory using Bash

Handy one-liners

for D in *; do echo "$D"; done
for D in *; do find "$D" -type d; done ### Option A

find * -type d ### Option B

Option A is correct for folders with spaces in between. Also, generally faster since it doesn't print each word in a folder name as a separate entity.

# Option A
$ time for D in ./big_dir/*; do find "$D" -type d > /dev/null; done
real    0m0.327s
user    0m0.084s
sys     0m0.236s

# Option B
$ time for D in `find ./big_dir/* -type d`; do echo "$D" > /dev/null; done
real    0m0.787s
user    0m0.484s
sys     0m0.308s

How do I put hint in a asp:textbox

Just write like this:

<asp:TextBox ID="TextBox1" runat="server" placeholder="hi test"></asp:TextBox>

How to extract img src, title and alt from html using php?

Here's A PHP Function I hobbled together from all of the above info for a similar purpose, namely adjusting image tag width and length properties on the fly ... a bit clunky, perhaps, but seems to work dependably:

function ReSizeImagesInHTML($HTMLContent,$MaximumWidth,$MaximumHeight) {

// find image tags
preg_match_all('/<img[^>]+>/i',$HTMLContent, $rawimagearray,PREG_SET_ORDER); 

// put image tags in a simpler array
$imagearray = array();
for ($i = 0; $i < count($rawimagearray); $i++) {
    array_push($imagearray, $rawimagearray[$i][0]);
}

// put image attributes in another array
$imageinfo = array();
foreach($imagearray as $img_tag) {

    preg_match_all('/(src|width|height)=("[^"]*")/i',$img_tag, $imageinfo[$img_tag]);
}

// combine everything into one array
$AllImageInfo = array();
foreach($imagearray as $img_tag) {

    $ImageSource = str_replace('"', '', $imageinfo[$img_tag][2][0]);
    $OrignialWidth = str_replace('"', '', $imageinfo[$img_tag][2][1]);
    $OrignialHeight = str_replace('"', '', $imageinfo[$img_tag][2][2]);

    $NewWidth = $OrignialWidth; 
    $NewHeight = $OrignialHeight;
    $AdjustDimensions = "F";

    if($OrignialWidth > $MaximumWidth) { 
        $diff = $OrignialWidth-$MaximumHeight; 
        $percnt_reduced = (($diff/$OrignialWidth)*100); 
        $NewHeight = floor($OrignialHeight-(($percnt_reduced*$OrignialHeight)/100)); 
        $NewWidth = floor($OrignialWidth-$diff); 
        $AdjustDimensions = "T";
    }

    if($OrignialHeight > $MaximumHeight) { 
        $diff = $OrignialHeight-$MaximumWidth; 
        $percnt_reduced = (($diff/$OrignialHeight)*100); 
        $NewWidth = floor($OrignialWidth-(($percnt_reduced*$OrignialWidth)/100)); 
        $NewHeight= floor($OrignialHeight-$diff); 
        $AdjustDimensions = "T";
    } 

    $thisImageInfo = array('OriginalImageTag' => $img_tag , 'ImageSource' => $ImageSource , 'OrignialWidth' => $OrignialWidth , 'OrignialHeight' => $OrignialHeight , 'NewWidth' => $NewWidth , 'NewHeight' => $NewHeight, 'AdjustDimensions' => $AdjustDimensions);
    array_push($AllImageInfo, $thisImageInfo);
}

// build array of before and after tags
$ImageBeforeAndAfter = array();
for ($i = 0; $i < count($AllImageInfo); $i++) {

    if($AllImageInfo[$i]['AdjustDimensions'] == "T") {
        $NewImageTag = str_ireplace('width="' . $AllImageInfo[$i]['OrignialWidth'] . '"', 'width="' . $AllImageInfo[$i]['NewWidth'] . '"', $AllImageInfo[$i]['OriginalImageTag']);
        $NewImageTag = str_ireplace('height="' . $AllImageInfo[$i]['OrignialHeight'] . '"', 'height="' . $AllImageInfo[$i]['NewHeight'] . '"', $NewImageTag);

        $thisImageBeforeAndAfter = array('OriginalImageTag' => $AllImageInfo[$i]['OriginalImageTag'] , 'NewImageTag' => $NewImageTag);
        array_push($ImageBeforeAndAfter, $thisImageBeforeAndAfter);
    }
}

// execute search and replace
for ($i = 0; $i < count($ImageBeforeAndAfter); $i++) {
    $HTMLContent = str_ireplace($ImageBeforeAndAfter[$i]['OriginalImageTag'],$ImageBeforeAndAfter[$i]['NewImageTag'], $HTMLContent);
}

return $HTMLContent;

}

How to overcome "datetime.datetime not JSON serializable"?

def j_serial(o):     # self contained
    from datetime import datetime, date
    return str(o).split('.')[0] if isinstance(o, (datetime, date)) else None

Usage of above utility:

import datetime
serial_d = j_serial(datetime.datetime.now())
if serial_d:
    print(serial_d)  # output: 2018-02-28 02:23:15

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>

jQuery $.ajax(), $.post sending "OPTIONS" as REQUEST_METHOD in Firefox

The reason for the error is the same origin policy. It only allows you to do XMLHTTPRequests to your own domain. See if you can use a JSONP callback instead:

$.getJSON( 'http://<url>/api.php?callback=?', function ( data ) { alert ( data ); } );

Difference between links and depends_on in docker_compose.yml

This answer is for docker-compose version 2 and it also works on version 3

You can still access the data when you use depends_on.

If you look at docker docs Docker Compose and Django, you still can access the database like this:

version: '2'
services:
  db:
    image: postgres
  web:
    build: .
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

What is the difference between links and depends_on?

links:

When you create a container for a database, for example:

docker run -d --name=test-mysql --env="MYSQL_ROOT_PASSWORD=mypassword" -P mysql

docker inspect d54cf8a0fb98 |grep HostPort

And you may find

"HostPort": "32777"

This means you can connect the database from your localhost port 32777 (3306 in container) but this port will change every time you restart or remove the container. So you can use links to make sure you will always connect to the database and don't have to know which port it is.

web:
  links:
   - db

depends_on:

I found a nice blog from Giorgio Ferraris Docker-compose.yml: from V1 to V2

When docker-compose executes V2 files, it will automatically build a network between all of the containers defined in the file, and every container will be immediately able to refer to the others just using the names defined in the docker-compose.yml file.

And

So we don’t need links anymore; links were used to start a network communication between our db container and our web-server container, but this is already done by docker-compose

Update

depends_on

Express dependency between services, which has two effects:

  • docker-compose up will start services in dependency order. In the following example, db and redis will be started before web.
  • docker-compose up SERVICE will automatically include SERVICE’s dependencies. In the following example, docker-compose up web will also create and start db and redis.

Simple example:

version: '2'
services:
  web:
    build: .
    depends_on:
      - db
      - redis
  redis:
    image: redis
  db:
    image: postgres

Note: depends_on will not wait for db and redis to be “ready” before starting web - only until they have been started. If you need to wait for a service to be ready, see Controlling startup order for more on this problem and strategies for solving it.

setState() inside of componentDidUpdate()

I had a similar problem where i have to center the toolTip. React setState in componentDidUpdate did put me in infinite loop, i tried condition it worked. But i found using in ref callback gave me simpler and clean solution, if you use inline function for ref callback you will face the null problem for every component update. So use function reference in ref callback and set the state there, which will initiate the re-render

What is the purpose of Looper and how to use it?

Handling multiple down or upload items in a Service is a better example.

Handler and AsnycTask are often used to propagate Events/Messages between the UI (thread) and a worker thread or to delay actions. So they are more related to UI.

A Looper handles tasks (Runnables, Futures) in a thread related queue in the background - even with no user interaction or a displayed UI (app downloads a file in the background during a call).

Git: How to remove file from index without deleting files from any repository

After doing the git rm --cached command, try adding myfile to the .gitignore file (create one if it does not exist). This should tell git to ignore myfile.

The .gitignore file is versioned, so you'll need to commit it and push it to the remote repository.

How to check whether a given string is valid JSON in Java

As you can see, there is a lot of solutions, they mainly parse the JSON to check it and at the end you will have to parse it to be sure.

But, depending on the context, you may improve the performances with a pre-check.

What I do when I call APIs, is just checking that the first character is '{' and the last is '}'. If it's not the case, I don't bother creating a parser.

How to use OpenFileDialog to select a folder?

Basically you need the FolderBrowserDialog class:

Prompts the user to select a folder. This class cannot be inherited.

Example:

using(var fbd = new FolderBrowserDialog())
{
    DialogResult result = fbd.ShowDialog();

    if (result == DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
    {
        string[] files = Directory.GetFiles(fbd.SelectedPath);

        System.Windows.Forms.MessageBox.Show("Files found: " + files.Length.ToString(), "Message");
    }
}

If you work in WPF you have to add the reference to System.Windows.Forms.

you also have to add using System.IO for Directory class

SCRIPT438: Object doesn't support property or method IE

I have added var for all the variables in the corrosponding javascript. That solved the problem in IE.

Previous Code

billableStatus = 1 ;
var classStr = $(this).attr("id").split("_");  
date = currentWeekDates[classStr[2]]; // Required    

activityNameId = "initialRows_" + classStr[1] + "_projectActivityName";
activityId = $("#"+activityNameId).val();        

var projectNameId = "initialRows_" + classStr[1] + "_projectName" ;
projectName = $("#"+projectNameId).val();        

var timeshitEntryId = "initialRows_"+classStr[1]+"_"+classStr[2];     
timeshitEntry = $("#"+timeshitEntryId).val();   

New Code

var billableStatus = 1 ;
var classStr = $(this).attr("id").split("_");  
var date = currentWeekDates[classStr[2]]; // Required    

var activityNameId = "initialRows_" + classStr[1] + "_projectActivityName";
var activityId = $("#"+activityNameId).val();        

var projectNameId = "initialRows_" + classStr[1] + "_projectName" ;
var projectName = $("#"+projectNameId).val();        

var timeshitEntryId = "initialRows_"+classStr[1]+"_"+classStr[2];     
var timeshitEntry = $("#"+timeshitEntryId).val();   

The module ".dll" was loaded but the entry-point was not found

The error indicates that the DLL is either not a COM DLL or it's corrupt. If it's not a COM DLL and not being used as a COM DLL by an application then there is no need to register it.
From what you say in your question (the service is not registered) it seems that we are talking about a service not correctly installed. I will try to reinstall the application.

Rails: Check output of path helper from console

Remember if your route is name-spaced, Like:

product GET  /products/:id(.:format)  spree/products#show

Then try :

helper.link_to("test", app.spree.product_path(Spree::Product.first), method: :get)

output

Spree::Product Load (0.4ms)  SELECT  "spree_products".* FROM "spree_products"  WHERE "spree_products"."deleted_at" IS NULL  ORDER BY "spree_products"."id" ASC LIMIT 1
=> "<a data-method=\"get\" href=\"/products/this-is-the-title\">test</a>" 

Error "can't use subversion command line client : svn" when opening android project checked out from svn

i have fixed the issue by just downloading the android command line tool from https://www.visualsvn.com/downloads/ download apache comand line tool unzip it on drive go to your android settings/version control/subversion and make sure only command line option is enable set the path of svn.exe as shown below C:\Users\viratsinh.parmar\Apace SVN client\Apache-Subversion-1.8.13\bin\svn.exe

now in your android studio update the project , you will be able to commit now. you can contact me on [email protected]

Using ChildActionOnly in MVC

A little late to the party, but...

The other answers do a good job of explaining what effect the [ChildActionOnly] attribute has. However, in most examples, I kept asking myself why I'd create a new action method just to render a partial view, within another view, when you could simply render @Html.Partial("_MyParialView") directly in the view. It seemed like an unnecessary layer. However, as I investigated, I found that one benefit is that the child action can create a different model and pass that to the partial view. The model needed for the partial might not be available in the model of the view in which the partial view is being rendered. Instead of modifying the model structure to get the necessary objects/properties there just to render the partial view, you can call the child action and have the action method take care of creating the model needed for the partial view.

This can come in handy, for example, in _Layout.cshtml. If you have a few properties common to all pages, one way to accomplish this is use a base view model and have all other view models inherit from it. Then, the _Layout can use the base view model and the common properties. The downside (which is subjective) is that all view models must inherit from the base view model to guarantee that those common properties are always available. The alternative is to render @Html.Action in those common places. The action method would create a separate model needed for the partial view common to all pages, which would not impact the model for the "main" view. In this alternative, the _Layout page need not have a model. It follows that all other view models need not inherit from any base view model.

I'm sure there are other reasons to use the [ChildActionOnly] attribute, but this seems like a good one to me, so I thought I'd share.

How to create a video from images with FFmpeg?

Simple Version from the Docs

Works particularly great for Google Earth Studio images:

ffmpeg -framerate 24 -i Project%03d.png Project.mp4

Static variables in C++

Static variable in a header file:

say 'common.h' has

static int zzz;

This variable 'zzz' has internal linkage (This same variable can not be accessed in other translation units). Each translation unit which includes 'common.h' has it's own unique object of name 'zzz'.

Static variable in a class:

Static variable in a class is not a part of the subobject of the class. There is only one copy of a static data member shared by all the objects of the class.

$9.4.2/6 - "Static data members of a class in namespace scope have external linkage (3.5).A local class shall not have static data members."

So let's say 'myclass.h' has

struct myclass{
   static int zzz;        // this is only a declaration
};

and myclass.cpp has

#include "myclass.h"

int myclass::zzz = 0           // this is a definition, 
                               // should be done once and only once

and "hisclass.cpp" has

#include "myclass.h"

void f(){myclass::zzz = 2;}    // myclass::zzz is always the same in any 
                               // translation unit

and "ourclass.cpp" has

#include "myclass.h"
void g(){myclass::zzz = 2;}    // myclass::zzz is always the same in any 
                               // translation unit

So, class static members are not limited to only 2 translation units. They need to be defined only once in any one of the translation units.

Note: usage of 'static' to declare file scope variable is deprecated and unnamed namespace is a superior alternate

Python dictionary: are keys() and values() always the same order?

I wasn't satisfied with these answers since I wanted to ensure the exported values had the same ordering even when using different dicts.

Here you specify the key order upfront, the returned values will always have the same order even if the dict changes, or you use a different dict.

keys = dict1.keys()
ordered_keys1 = [dict1[cur_key] for cur_key in keys]
ordered_keys2 = [dict2[cur_key] for cur_key in keys]

How to iterate over associative arrays in Bash

The keys are accessed using an exclamation point: ${!array[@]}, the values are accessed using ${array[@]}.

You can iterate over the key/value pairs like this:

for i in "${!array[@]}"
do
  echo "key  : $i"
  echo "value: ${array[$i]}"
done

Note the use of quotes around the variable in the for statement (plus the use of @ instead of *). This is necessary in case any keys include spaces.

The confusion in the other answer comes from the fact that your question includes "foo" and "bar" for both the keys and the values.

How to do a https request with bad certificate?

Proper way (as of Go 1.13) (provided by answer below):

customTransport := http.DefaultTransport.(*http.Transport).Clone()
customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
client := &http.Client{Transport: customTransport}

Original Answer:

Here's a way to do it without losing the default settings of the DefaultTransport, and without needing the fake request as per user comment.

defaultTransport := http.DefaultTransport.(*http.Transport)

// Create new Transport that ignores self-signed SSL
customTransport := &http.Transport{
  Proxy:                 defaultTransport.Proxy,
  DialContext:           defaultTransport.DialContext,
  MaxIdleConns:          defaultTransport.MaxIdleConns,
  IdleConnTimeout:       defaultTransport.IdleConnTimeout,
  ExpectContinueTimeout: defaultTransport.ExpectContinueTimeout,
  TLSHandshakeTimeout:   defaultTransport.TLSHandshakeTimeout,
  TLSClientConfig:       &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: customTransport}

Shorter way:

customTransport := &(*http.DefaultTransport.(*http.Transport)) // make shallow copy
customTransport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
client := &http.Client{Transport: customTransport}

Warning: For testing/development purposes only. Anything else, proceed at your own risk!!!

Access parent's parent from javascript object

If I'm reading your question correctly, objects in general are agnostic about where they are contained. They don't know who their parents are. To find that information, you have to parse the parent data structure. The DOM has ways of doing this for us when you're talking about element objects in a document, but it looks like you're talking about vanilla objects.

How to set a value to a file input in HTML?

You can't.

The only way to set the value of a file input is by the user to select a file.

This is done for security reasons. Otherwise you would be able to create a JavaScript that automatically uploads a specific file from the client's computer.

How to pass parameters to a Script tag?

If you are using jquery you might want to consider their data method.

I have used something similar to what you are trying in your response but like this:

<script src="http://path.to/widget.js" param_a = "2" param_b = "5" param_c = "4">
</script>

You could also create a function that lets you grab the GET params directly (this is what I frequently use):

function $_GET(q,s) {
    s = s || window.location.search;
    var re = new RegExp('&'+q+'=([^&]*)','i');
    return (s=s.replace(/^\?/,'&').match(re)) ? s=s[1] : s='';
}

// Grab the GET param
var param_a = $_GET('param_a');

Configuring diff tool with .gitconfig

If you want to have an option to use multiple diff tools add an alias to .gitconfig

[alias]
    kdiff = difftool --tool kdiff3