How to shutdown my Jenkins safely?

jenkinsUrl/safeRestart - Let you to wait for running JOBS to get complete and do a RESTART.
jenkinsUrl/restart - Do a restart immediately without waiting for the jobs which are running currently.
jenkinsUrl/exit - It stops/shutdown the JENKINS services
jenkinsUrl/reload - To reload the configuration changes.

ImportError: numpy.core.multiarray failed to import

Try sudo pip install numpy --upgrade --ignore-installed.

It work in Mac OS 10.11.

You should close The 'Rootless' if above shell isn't work.

PHP - Getting the index of a element from a array

There is no way to get a position which you really want.
For associative array, to determine last iteration you can use already mentioned counter variable, or determine last item's key first:

end($array);
$last = key($array);
foreach($array as $key => value)
  if($key == $last) ....

Stored procedure or function expects parameter which is not supplied

In my case, It was returning one output parameter and was not Returning any value.
So changed it to

param.Direction = ParameterDirection.Output;
command.ExecuteScalar();

and then it was throwing size error. so had to set the size as well

SqlParameter param = new SqlParameter("@Name",SqlDbType.NVarChar);
param.Size = 10;

Hide scroll bar, but while still being able to scroll

I happen to try the above solutions in my project and for some reason I was not able to hide the scroll bar due to div positioning. Hence, I decided to hide the scroll bar by introducing a div that covers it superficially. Example below is for a horizontal scroll bar:

<div id="container">
  <div id="content">
     My content that could overflow horizontally
  </div>
  <div id="scroll-cover">
     &nbsp; 
  </div>
</div>

Corresponding CSS is as follows:

#container{
   width: 100%;
   height: 100%;
   overflow: hidden;
   position: relative;
}

#content{
  width: 100%;
  height: 100%;
  overflow-x: scroll;
}
#scroll-cover{
  width: 100%;
  height: 20px;
  position: absolute;
  bottom: 0;
  background-color: #fff; /*change this to match color of page*/
}

How to change background color in the Notepad++ text editor?

If anyone wants to enable dark mode, you may follow the below steps

Open your Notepad++, and select “Settings” on the menu bar, and choose “Style configurator”.
Select theme “Obsidian” (you can choose other dark themes)
Click on Save&Colse

Set Focus on EditText

new OnEditorActionListener(){
   @Override
   public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
      editText.requestFocus();
      //used ******* return true ******
      return **true**;
   }
}

How can I make a program wait for a variable change in javascript?

JavaScript is one of the worst program\scripting language ever!

"Wait" seems to be impossible in JavaScript! (Yes, like in the real life, sometimes waiting is the best option!)

I tried "while" loop and "Recursion" (a function calls itself repeatedly until ...), but JavaScript refuses to work anyway! (This is unbelievable, but anyway, see the codes below:)

while loop:

<!DOCTYPE html>

<script>

var Continue = "no";
setTimeout(function(){Continue = "yes";}, 5000);    //after 5 seconds, "Continue" is changed to "yes"

while(Continue === 'no'){};    //"while" loop will stop when "Continue" is changed to "yes" 5 seconds later

    //the problem here is that "while" loop prevents the "setTimeout()" to change "Continue" to "yes" 5 seconds later
    //worse, the "while" loop will freeze the entire browser for a brief time until you click the "stop" script execution button

</script>

Recursion:

<!DOCTYPE html>

1234

<script>

function Wait_If(v,c){
if (window[v] === c){Wait_If(v,c)};
};

Continue_Code = "no"
setTimeout(function(){Continue_Code = "yes";}, 5000);    //after 5 seconds, "Continue_Code" is changed to "yes"

Wait_If('Continue_Code', 'no');

    //the problem here, the javascript console trows the "too much recursion" error, because "Wait_If()" function calls itself repeatedly!

document.write('<br>5678');     //this line will not be executed because of the "too much recursion" error above!

</script>

Find all files in a directory with extension .txt in Python

import os
import sys 

if len(sys.argv)==2:
    print('no params')
    sys.exit(1)

dir = sys.argv[1]
mask= sys.argv[2]

files = os.listdir(dir); 

res = filter(lambda x: x.endswith(mask), files); 

print res

How can I check if my Element ID has focus?

Write below code in script and also add jQuery library

var getElement = document.getElementById('myID');

if (document.activeElement === getElement) {
        $(document).keydown(function(event) {
            if (event.which === 40) {
                console.log('keydown pressed')
            }
        });
    }

Thank you...

Mockito: Mock private field initialization

In case you use Spring Test try org.springframework.test.util.ReflectionTestUtils

 ReflectionTestUtils.setField(testObject, "person", mockedPerson);

Why do you need to invoke an anonymous function on the same line?

When you did:

(function (msg){alert(msg)});
('SO');

You ended the function before ('SO') because of the semicolon. If you just write:

(function (msg){alert(msg)})
('SO');

It will work.

Working example: http://jsfiddle.net/oliverni/dbVjg/

Required attribute HTML5

Note that

<input type="text" id="car" required="true" />

is wrong, it should be one of

<input type="text" id="car" required />
<input type="text" id="car" required="" />
<input type="text" id="car" required='' />
<input type="text" id="car" required=required />
<input type="text" id="car" required="required" />
<input type="text" id="car" required='required' />

This is because the true value suggests that the false value will make the form control optional, which is not the case.

What's the difference between next() and nextLine() methods from Scanner class?

In short: if you are inputting a string array of length t, then Scanner#nextLine() expects t lines, each entry in the string array is differentiated from the other by enter key.And Scanner#next() will keep taking inputs till you press enter but stores string(word) inside the array, which is separated by whitespace.

Lets have a look at following snippet of code

    Scanner in = new Scanner(System.in);
    int t = in.nextInt();
    String[] s = new String[t];

    for (int i = 0; i < t; i++) {
        s[i] = in.next();
    }

when I run above snippet of code in my IDE (lets say for string length 2),it does not matter whether I enter my string as

Input as :- abcd abcd or

Input as :-

abcd

Output will be like abcd

abcd

But if in same code we replace next() method by nextLine()

    Scanner in = new Scanner(System.in);
    int t = in.nextInt();
    String[] s = new String[t];

    for (int i = 0; i < t; i++) {
        s[i] = in.nextLine();
    }

Then if you enter input on prompt as - abcd abcd

Output is :-

abcd abcd

and if you enter the input on prompt as abcd (and if you press enter to enter next abcd in another line, the input prompt will just exit and you will get the output)

Output is:-

abcd

Can I prevent text in a div block from overflowing?

You can just set the min-width in the css, for example:

.someClass{min-width: 980px;}

It will not break, nevertheless you will still have the scroll-bar to deal with.

'IF' in 'SELECT' statement - choose output value based on column values

SELECT id, 
       IF(type = 'P', amount, amount * -1) as amount
FROM report

See http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html.

Additionally, you could handle when the condition is null. In the case of a null amount:

SELECT id, 
       IF(type = 'P', IFNULL(amount,0), IFNULL(amount,0) * -1) as amount
FROM report

The part IFNULL(amount,0) means when amount is not null return amount else return 0.

How do I make WRAP_CONTENT work on a RecyclerView

Simply put your RecyclerView inside a NestedScrollView. Works perfectly

<android.support.v4.widget.NestedScrollView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:layout_marginBottom="25dp">
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/kliste"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent" />
            </android.support.v4.widget.NestedScrollView>

convert string to specific datetime format?

More formats:

 require 'date'

 date = "01/07/2016 09:17AM"
 DateTime.parse(date).strftime("%A, %b %d")
 #=> Friday, Jul 01

 DateTime.parse(date).strftime("%m/%d/%Y")
 #=> 07/01/2016

 DateTime.parse(date).strftime("%m-%e-%y %H:%M")
 #=> 07- 1-16 09:17

 DateTime.parse(date).strftime("%b %e")
 #=> Jul  1

 DateTime.parse(date).strftime("%l:%M %p")
 #=>  9:17 AM

 DateTime.parse(date).strftime("%B %Y")
 #=> July 2016
 DateTime.parse(date).strftime("%b %d, %Y")
 #=> Jul 01, 2016
 DateTime.parse(date).strftime("%a, %e %b %Y %H:%M:%S %z")
 #=> Fri,  1 Jul 2016 09:17:00 +0200
 DateTime.parse(date).strftime("%Y-%m-%dT%l:%M:%S%z")
 #=> 2016-07-01T 9:17:00+0200
 DateTime.parse(date).strftime("%I:%M:%S %p")
 #=> 09:17:00 AM
 DateTime.parse(date).strftime("%H:%M:%S")
 #=> 09:17:00
 DateTime.parse(date).strftime("%e %b %Y %H:%M:%S%p")
 #=>  1 Jul 2016 09:17:00AM
 DateTime.parse(date).strftime("%d.%m.%y")
 #=> 01.07.16
 DateTime.parse(date).strftime("%A, %d %b %Y %l:%M %p")
 #=> Friday, 01 Jul 2016  9:17 AM

Jenkins not executing jobs (pending - waiting for next executor)

In my case, I had just installed the "Authorize Project" plugin and incorrectly setup the strategy in "Manage Jenkins -> Configure Global Security -> Access Control for Builds" as "Run as anonymous". So 'anonymous' had no rights to execute the job.

Setting the first strategy as "Run as User who Triggered Build" unlocked the queued jobs.

Using Server.MapPath in external C# Classes in ASP.NET

The server.mappath("") will work on aspx page,if you want to get the absolute path from a class file you have to use this-

HttpContext.Current.Server.MapPath("~/EmailLogic/RegistrationTemplate.html")

How do I run a single test using Jest?

I took me a while to find this so I'd like to add it here for people like me who use yarn:

yarn test -i "src/components/folderX/folderY/.../Filename.ts" -t "name of test"

So filename after -i and testname after -t.

What exactly is Spring Framework for?

The accepted answer doesn't involve the annotations usage since Spring introduced support for various annotations for configuration.

Spring (Dependency Injection) approach

There the another way to wire the classes up alongside using a XML file: the annotations. Let's use the example from the accepted answer and register the bean directly on the class using one of the annotations @Component, @Service, @Repository or @Configuration:

@Component
public class UserListerDB implements UserLister {
    public List<User> getUsers() {
        // DB access code here
    }
}

This way when the view is created it magically will have a UserLister ready to work.

The above statement is valid with a little bonus of no need of any XML file usage and wiring with another annotation @Autowired that finds a relevant implementation and inject it in.

@Autowired
private UserLister userLister;

Use the @Bean annotation on a method used to get the bean implementation to inject.

Difference between frontend, backend, and middleware in web development

Here is one breakdown:

Front-end tier -> User Interface layer usually consisting of a mix of HTML, Javascript, CSS, Flash, and various server-side code like ASP.Net, classic ASP, PHP, etc. Think of this as being closest to the user in terms of code.

Middleware, middle-tier -> One tier back, generally referred to as the "plumbing" part of a system. Java and C# are common languages for writing this part that could be viewed as the glue between the UI and the data and can be webservices or WCF components or other SOA components possibly.

Back-end tier -> Databases and other data stores are generally at this level. Oracle, MS-SQL, MySQL, SAP, and various off-the-shelf pieces of software come to mind for this piece of software that is the final processing of the data.

Overlap can exist between any of these as you could have everything poured into one layer like an ASP.Net website that uses the built-in AJAX functionality that generates Javascript while the code behind may contain database commands making the code behind contain both middle and back-end tiers. Alternatively, one could use VBScript to act as all the layers using ADO objects and merging all three tiers into one.

Similarly, taking middleware and either front or back-end can be combined in some cases.

Bottlenecks generally have a few different levels to them:

1) Database or back-end processing -> This can vary from payroll or sales or other tasks where the throughput to the database is bogging things down.

2) Middleware bottlenecks -> This would be where some web service may be hitting capacity but the front and back ends have bandwidth to handle more traffic. Alternatively, there may be some server that is part of a system that isn't quite the UI part or the raw data that can be a bottleneck using something like Biztalk or MSMQ.

3) Front-end bottlenecks -> This could client or server-side issues. For example, if you took a low-end PC and had it load a web page that consisted of a lot of data being downloaded, the client could be where the bottleneck is. Similarly, the server could be queuing up requests if it is getting hammered with requests like what Amazon.com or other high-traffic websites may get at times.

Some of this is subject to interpretation, so it isn't perfect by any means and YMMV.

EDIT: Something to consider is that some systems can have multiple front-ends or back-ends. For example, a content management system will likely have a way for site visitors to view the content that is a front-end but what about how content editors are able to change the data on the site? The ability to pull up this data could be seen as front-end since it is a UI component or it could be seen as a back-end since it is used by internal users rather than the general public viewing the site. Thus, there is something to be said for context here.

jquery stop child triggering parent event

Or, rather than having an extra event handler to prevent another handler, you can use the Event Object argument passed to your click event handler to determine whether a child was clicked. target will be the clicked element and currentTarget will be the .header div:

$(".header").click(function(e){
     //Do nothing if .header was not directly clicked
     if(e.target !== e.currentTarget) return;

     $(this).children(".children").toggle();
});

What's the difference between select_related and prefetch_related in Django ORM?

As Django documentation says:

prefetch_related()

Returns a QuerySet that will automatically retrieve, in a single batch, related objects for each of the specified lookups.

This has a similar purpose to select_related, in that both are designed to stop the deluge of database queries that is caused by accessing related objects, but the strategy is quite different.

select_related works by creating an SQL join and including the fields of the related object in the SELECT statement. For this reason, select_related gets the related objects in the same database query. However, to avoid the much larger result set that would result from joining across a ‘many’ relationship, select_related is limited to single-valued relationships - foreign key and one-to-one.

prefetch_related, on the other hand, does a separate lookup for each relationship, and does the ‘joining’ in Python. This allows it to prefetch many-to-many and many-to-one objects, which cannot be done using select_related, in addition to the foreign key and one-to-one relationships that are supported by select_related. It also supports prefetching of GenericRelation and GenericForeignKey, however, it must be restricted to a homogeneous set of results. For example, prefetching objects referenced by a GenericForeignKey is only supported if the query is restricted to one ContentType.

More information about this: https://docs.djangoproject.com/en/2.2/ref/models/querysets/#prefetch-related

Gson: Is there an easier way to serialize a map

Default

The default Gson implementation of Map serialization uses toString() on the key:

Gson gson = new GsonBuilder()
        .setPrettyPrinting().create();
Map<Point, String> original = new HashMap<>();
original.put(new Point(1, 2), "a");
original.put(new Point(3, 4), "b");
System.out.println(gson.toJson(original));

Will give:

{
  "java.awt.Point[x\u003d1,y\u003d2]": "a",
  "java.awt.Point[x\u003d3,y\u003d4]": "b"
}

Using `enableComplexMapKeySerialization`

If you want the Map Key to be serialized according to default Gson rules you can use enableComplexMapKeySerialization. This will return an array of arrays of key-value pairs:

Gson gson = new GsonBuilder().enableComplexMapKeySerialization()
        .setPrettyPrinting().create();
Map<Point, String> original = new HashMap<>();
original.put(new Point(1, 2), "a");
original.put(new Point(3, 4), "b");
System.out.println(gson.toJson(original));

Will return:

[
  [
    {
      "x": 1,
      "y": 2
    },
    "a"
  ],
  [
    {
      "x": 3,
      "y": 4
    },
    "b"
  ]
]

More details can be found here.

Excel Date to String conversion

If you are not using programming then do the following (1) select the column (2) right click and select Format Cells (3) Select "Custom" (4) Just Under "Type:" type dd/mm/yyyy hh:mm:ss

Chart won't update in Excel (2007)

This might look extremely basic but I just tried Manual Calculating on the spreadsheet where the charts were (by pressing F9) and it worked! Tha VBA code for it is simply:

Calculate

;)

do <something> N times (declarative syntax)

Assuming we can use some ES6 syntax like the spread operator, we'll want to do something as many times as the sum of all numbers in the collection.

In this case if times is equal to [1,2,3], the total number of times will be 6, i.e. 1+2+3.

/**
 * @param {number[]} times
 * @param {cb} function
 */
function doTimes(times, cb) {
  // Get the sum of all the times
  const totalTimes = times.reduce((acc, time) => acc + time);
  // Call the callback as many times as the sum
  [...Array(totalTimes)].map(cb);
}

doTimes([1,2,3], () => console.log('something'));
// => Prints 'something' 6 times

This post should be helpful if the logic behind constructing and spreading an array isn't apparent.

Is there any difference between "!=" and "<>" in Oracle Sql?

No there is no difference at all in functionality.
(The same is true for all other DBMS - most of them support both styles):

Here is the current SQL reference: https://docs.oracle.com/database/121/SQLRF/conditions002.htm#CJAGAABC

The SQL standard only defines a single operator for "not equals" and that is <>

how to delete the content of text file without deleting itself

you can write a generic method as (its too late but below code will help you/others)

public static FileInputStream getFile(File fileImport) throws IOException {
      FileInputStream fileStream = null;
    try {
        PrintWriter writer = new PrintWriter(fileImport);
        writer.print(StringUtils.EMPTY);
        fileStream = new FileInputStream(fileImport);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            writer.close();
        }
         return fileStream;
}

Add Facebook Share button to static HTML page

 <div class="fb_share">
     <a name="fb_share" type="box_count" share_url="<?php the_permalink() ?>"
       href="http://www.facebook.com/sharer.php">Partilhar</a>
     <script src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" type="text/javascript"></script> </div> <?php }  }

 add_action('thesis_hook_byline_item','fb_share');

Spring not autowiring in unit tests with JUnit

You need to add annotations to the Junit class, telling it to use the SpringJunitRunner. The ones you want are:

@ContextConfiguration("/test-context.xml")
@RunWith(SpringJUnit4ClassRunner.class)

This tells Junit to use the test-context.xml file in same directory as your test. This file should be similar to the real context.xml you're using for spring, but pointing to test resources, naturally.

Error in installation a R package

In my case, I had to close R session and reinstall all packages. In that session I worked with large tables, I suspect this might have had the effect.

Best way to represent a Grid or Table in AngularJS with Bootstrap 3?

Adapt-Strap. Here is the fiddle.

It is extremely lightweight and has dynamic row heights.

<ad-table-lite table-name="carsForSale"
               column-definition="carsTableColumnDefinition"
               local-data-source="models.carsForSale"
               page-sizes="[7, 20]">
</ad-table-lite>

Generating HTML email body in C#

Use the System.Web.UI.HtmlTextWriter class.

StringWriter writer = new StringWriter();
HtmlTextWriter html = new HtmlTextWriter(writer);

html.RenderBeginTag(HtmlTextWriterTag.H1);
html.WriteEncodedText("Heading Here");
html.RenderEndTag();
html.WriteEncodedText(String.Format("Dear {0}", userName));
html.WriteBreak();
html.RenderBeginTag(HtmlTextWriterTag.P);
html.WriteEncodedText("First part of the email body goes here");
html.RenderEndTag();
html.Flush();

string htmlString = writer.ToString();

For extensive HTML that includes the creation of style attributes HtmlTextWriter is probably the best way to go. However it can be a bit clunky to use and some developers like the markup itself to be easily read but perversly HtmlTextWriter's choices with regard indentation is a bit wierd.

In this example you can also use XmlTextWriter quite effectively:-

writer = new StringWriter();
XmlTextWriter xml = new XmlTextWriter(writer);
xml.Formatting = Formatting.Indented;
xml.WriteElementString("h1", "Heading Here");
xml.WriteString(String.Format("Dear {0}", userName));
xml.WriteStartElement("br");
xml.WriteEndElement();
xml.WriteElementString("p", "First part of the email body goes here");
xml.Flush();

Get remote registry value

For remote registry you have to use .NET with powershell 2.0

$w32reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine',$computer1)
$keypath = 'SOFTWARE\Veritas\NetBackup\CurrentVersion'
$netbackup = $w32reg.OpenSubKey($keypath)
$NetbackupVersion1 = $netbackup.GetValue('PackageVersion')

Remove First and Last Character C++

My BASIC interpreter chops beginning and ending quotes with

str->pop_back();
str->erase(str->begin());

Of course, I always expect well-formed BASIC style strings, so I will abort with failed assert if not:

assert(str->front() == '"' && str->back() == '"');

Just my two cents.

Add 2 hours to current time in MySQL?

The DATE_ADD() function will do the trick. (You can also use the ADDTIME() function if you're running at least v4.1.1.)

For your query, this would be:

SELECT * 
FROM courses 
WHERE DATE_ADD(now(), INTERVAL 2 HOUR) > start_time

Or,

SELECT * 
FROM courses 
WHERE ADDTIME(now(), '02:00:00') > start_time

How do I convert an integer to binary in JavaScript?

A simple way is just...

Number(42).toString(2);

// "101010"

Finish all previous activities

    Intent i1=new Intent(getApplicationContext(),StartUp_Page.class);
i1.setAction(Intent.ACTION_MAIN);
i1.addCategory(Intent.CATEGORY_HOME);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i1.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
i1.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i1);
finish();

How to auto-size an iFrame?

On any other element, I would use the scrollHeight of the DOM object and set the height accordingly. I don't know if this would work on an iframe (because they're a bit kooky about everything) but it's certainly worth a try.

Edit: Having had a look around, the popular consensus is setting the height from within the iframe using the offsetHeight:

function setHeight() {
    parent.document.getElementById('the-iframe-id').style.height = document['body'].offsetHeight + 'px';
}

And attach that to run with the iframe-body's onLoad event.

Lowercase and Uppercase with jQuery

If it's just for display purposes, you can render the text as upper or lower case in pure CSS, without any Javascript using the text-transform property:

.myclass {
    text-transform: lowercase;
}

See https://developer.mozilla.org/en/CSS/text-transform for more info.

However, note that this doesn't actually change the value to lower case; it just displays it that way. This means that if you examine the contents of the element (ie using Javascript), it will still be in its original format.

RSA encryption and decryption in Python

You can use simple way for genarate RSA . Use rsa library

pip install rsa

In git, what is the difference between merge --squash and rebase?

Merge squash merges a tree (a sequence of commits) into a single commit. That is, it squashes all changes made in n commits into a single commit.

Rebasing is re-basing, that is, choosing a new base (parent commit) for a tree. Maybe the mercurial term for this is more clear: they call it transplant because it's just that: picking a new ground (parent commit, root) for a tree.

When doing an interactive rebase, you're given the option to either squash, pick, edit or skip the commits you are going to rebase.

Hope that was clear!

proper hibernate annotation for byte[]

I have finally got this working. It expands on the solution from A. Garcia, however, since the problem lies in the hibernate type MaterializedBlob type just mapping Blob > bytea is not sufficient, we need a replacement for MaterializedBlobType which works with hibernates broken blob support. This implementation only works with bytea, but maybe the guy from the JIRA issue who wanted OID could contribute an OID implementation.

Sadly replacing these types at runtime is a pain, since they should be part of the Dialect. If only this JIRA enhanement gets into 3.6 it would be possible.

public class PostgresqlMateralizedBlobType extends AbstractSingleColumnStandardBasicType<byte[]> {
 public static final PostgresqlMateralizedBlobType INSTANCE = new PostgresqlMateralizedBlobType();

 public PostgresqlMateralizedBlobType() {
  super( PostgresqlBlobTypeDescriptor.INSTANCE, PrimitiveByteArrayTypeDescriptor.INSTANCE );
 }

  public String getName() {
   return "materialized_blob";
  }
}

Much of this could probably be static (does getBinder() really need a new instance?), but I don't really understand the hibernate internal so this is mostly copy + paste + modify.

public class PostgresqlBlobTypeDescriptor extends BlobTypeDescriptor implements SqlTypeDescriptor {
  public static final BlobTypeDescriptor INSTANCE = new PostgresqlBlobTypeDescriptor();

  public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
   return new PostgresqlBlobBinder<X>(javaTypeDescriptor, this);
  }
  public <X> ValueExtractor<X> getExtractor(final JavaTypeDescriptor<X> javaTypeDescriptor) {
   return new BasicExtractor<X>( javaTypeDescriptor, this ) {
    protected X doExtract(ResultSet rs, String name, WrapperOptions options) throws SQLException { 
      return (X)rs.getBytes(name);
    }
   };
  }
}

public class PostgresqlBlobBinder<J> implements ValueBinder<J> {
 private final JavaTypeDescriptor<J> javaDescriptor;
 private final SqlTypeDescriptor sqlDescriptor;

 public PostgresqlBlobBinder(JavaTypeDescriptor<J> javaDescriptor, SqlTypeDescriptor sqlDescriptor) { 
  this.javaDescriptor = javaDescriptor; this.sqlDescriptor = sqlDescriptor;
 }  
 ...
 public final void bind(PreparedStatement st, J value, int index, WrapperOptions options) 
 throws SQLException {
  st.setBytes(index, (byte[])value);
 }
}

How to redirect to action from JavaScript method?

Use the @Url.Action method. This will work and determines the correct route regardless of what IIS server you deploy to.

Example- window.location.href="@Url.Action("Action", "Controller")";

so in the case of the Index action on the Home controller - window.location.href="@Url.Action("Index", "Home")";

How to make the first option of <select> selected with jQuery

Another way to reset the values (for multiple selected elements) could be this:

$("selector").each(function(){

    /*Perform any check and validation if needed for each item */

    /*Use "this" to handle the element in javascript or "$(this)" to handle the element with jquery */

    this.selectedIndex=0;

});

Why is reading lines from stdin much slower in C++ than Python?

How do I create batch file to rename large number of files in a folder?

dir /b *.jpg >file.bat

This will give you lines such as:

Vacation2010 001.jpg
Vacation2010 002.jpg
Vacation2010 003.jpg

Edit file.bat in your favorite Windows text-editor, doing the equivalent of:

s/Vacation2010(.+)/rename "&" "December \1"/

That's a regex; many editors support them, but none that come default with Windows (as far as I know). You can also get a command line tool such as sed or perl which can take the exact syntax I have above, after escaping for the command line.

The resulting lines will look like:

rename "Vacation2010 001.jpg" "December 001.jpg"
rename "Vacation2010 002.jpg" "December 002.jpg"
rename "Vacation2010 003.jpg" "December 003.jpg"

You may recognize these lines as rename commands, one per file from the original listing. ;) Run that batch file in cmd.exe.

How do I get LaTeX to hyphenate a word that contains a dash?

I had the same problem. I use hyphenat plus the following macro:

\RequirePackage{hyphenat}
\RequirePackage{expl3}


% The following defs make sure words that contain an explicit `-` (hyphen) are still hyphenated the normal way, and double- and triple hyphens keep working the way they should. Just don't use a `-` as the last token of your document. Also note that `-` is now a macro that is not fully expandable

\ExplSyntaxOn

% latex2e doesn't like commands starting with 'end', apparently expl3 doesn't have any problems with it
\cs_new:Npn \hyphenfix_emdash:c {---}
\cs_new:Npn \hyphenfix_endash:c {--}

\cs_new:Npn \hyphenfix_discardnext:NN #1#2{#1}


\catcode`\-=\active

\cs_new_protected:Npn -{
    \futurelet\hyphenfix_nexttok\hyphenfix_i:w
}

\cs_new:Npn \hyphenfix_i:w {
    \cs_if_eq:NNTF{\hyphenfix_nexttok}{-}{
        %discard the next `-` token
        \hyphenfix_discardnext:NN{\futurelet\hyphenfix_nexttok\hyphenfix_ii:w}
    }{
        % from package hyphenat
        \hyp
    }
}

\cs_new:Npn \hyphenfix_ii:w {
    \cs_if_eq:NNTF{\hyphenfix_nexttok}{-}{
        \hyphenfix_discardnext:NN{\hyphenfix_emdash:c}
    }{
        \hyphenfix_endash:c
    }
}


\ExplSyntaxOff

Note that this uses the expl3 package from latex3.

It makes the - an active character that scans forward to see if it is followed by more dashes. If so, it stays a -, to make sure -- and --- keep working. If not, it becomes the \hyp command from hyphenat, enabling word breaks in the rest of the word. This is a generic solution that makes all words that contain explicit hyphens hyphenate normally.

Note that - becomes a macro that is not fully expandable, so try to include this after loading other packages that may not expect - to be a macro

Edit: This is my second version, the first version was less robust when a { or } followed a hyphen. This one is not, but unlike the first version the - in this version is not fully expandable.

How to get a list of column names on Sqlite3 database?

In order to get the column information you can use the following snippet:

String sql = "select * from "+oTablename+" LIMIT 0";
Statement statement = connection.createStatement();
ResultSet rs = statement.executeQuery(sql);
ResultSetMetaData mrs = rs.getMetaData();
for(int i = 1; i <= mrs.getColumnCount(); i++)
{
    Object row[] = new Object[3];
    row[0] = mrs.getColumnLabel(i);
    row[1] = mrs.getColumnTypeName(i);
    row[2] = mrs.getPrecision(i);
}

How to remove constraints from my MySQL table?

Some ORM's or frameworks use a different naming convention for foreign keys than the default FK_[parent table]_[referenced table]_[referencing field], because they can be altered.

Laravel for example uses [parent table]_[referencing field]_foreign as naming convention. You can show the names of the foreign keys by using this query, as shown here:

SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE 
WHERE REFERENCED_TABLE_SCHEMA = '<database>' AND REFERENCED_TABLE_NAME = '<table>';

Then remove the foreign key by running the before mentioned DROP FOREIGN KEY query and its proper name.

How do I select an element in jQuery by using a variable for the ID?

Doing $('body').find(); is not necessary when looking up by ID; there is no performance gain.

Please also note that having an ID that starts with a number is not valid HTML:

ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").

I didn't find "ZipFile" class in the "System.IO.Compression" namespace

System.IO.Compression is now available as a nuget package maintained by Microsoft.

To use ZipFile you need to download System.IO.Compression.ZipFile nuget package.

How to reload/refresh jQuery dataTable?

If you use the url attribute, just do

table.ajax.reload()

Hopes it helps someone

Cannot find or open the PDB file in Visual Studio C++ 2010

Working with VS 2013.
Try the following Tools -> Options -> Debugging -> Output Window -> Module Load Messages -> Off

It will disable the display of modules loaded.

Use mysql_fetch_array() with foreach() instead of while()

To use foreach would require you have an array that contains every row from the query result. Some DB libraries for PHP provide a fetch_all function that provides an appropriate array but I could not find one for mysql (however the mysqli extension does) . You could of course write your own, like so

function mysql_fetch_all($result) {
   $rows = array();
   while ($row = mysql_fetch_array($result)) {
     $rows[] = $row;
   }
   return $rows;
}

However I must echo the "why?" Using this function you are creating two loops instead of one, and requring the entire result set be loaded in to memory. For sufficiently large result sets, this could become a serious performance drag. And for what?

foreach (mysql_fetch_all($result) as $row)

while ($row = mysql_fetch_array($result))

while is just as concise and IMO more readable.

EDIT There is another option, but it is pretty absurd. You could use the Iterator Interface

class MysqlResult implements Iterator {
  private $rownum = 0;
  private $numrows = 0;
  private $result;

  public function __construct($result) {
    $this->result = $result;
    $this->numrows = mysql_num_rows($result);
  }

  public function rewind() {
    $this->rownum = 0;
  }

  public function current() {
    mysql_data_seek($this->result, $this->rownum);
    return mysql_fetch_array($this->result);
  }

  public function key() {
    return $this->rownum;
  }

  public function next() {
    $this->rownum++;
  }

  public function valid() {
    return $this->rownum < $this->numrows ? true : false;
  }
}

$rows = new MysqlResult(mysql_query($query_select));

foreach ($rows as $row) {
  //code...
}

In this case, the MysqlResult instance fetches rows only on request just like with while, but wraps it in a nice foreach-able package. While you've saved yourself a loop, you've added the overhead of class instantiation and a boat load of function calls, not to mention a good deal of added code complexity.

But you asked if it could be done without using while (or for I imagine). Well it can be done, just like that. Whether it should be done is up to you.

Angular: conditional class with *ngClass

Try Like this..

Define your class with ''

<ol class="breadcrumb">
    <li *ngClass="{'active': step==='step1'}" (click)="step='step1; '">Step1</li>
    <li *ngClass="{'active': step==='step2'}"  (click)="step='step2'">Step2</li>
    <li *ngClass="{'active': step==='step3'}" (click)="step='step3'">Step3</li>
</ol>

How to detect Ctrl+V, Ctrl+C using JavaScript?

instead of onkeypress, use onkeydown.

<input type="text" onkeydown="if(event.ctrlKey && event.keyCode==86){return false;}" name="txt">

How to run vbs as administrator from vbs?

fun lil batch file

@set E=ECHO &set S=SET &set CS=CScript //T:3 //nologo %~n0.vbs /REALTIME^>nul^& timeout 1 /NOBREAK^>nul^& del /Q %~n0.vbs&CLS
@%E%off&color 4a&title %~n0&%S%CX=CLS^&EXIT&%S%BS=^>%~n0.vbs&%S%G=GOTO &%S%H=shell&AT>NUL
IF %ERRORLEVEL% EQU 0 (
    %G%2
) ELSE (
    if not "%minimized%"=="" %G%1
)
%S%minimized=true & start /min cmd /C "%~dpnx0"&%CX%
:1
%E%%S%%H%=CreateObject("%H%.Application"):%H%.%H%Execute "%~dpnx0",,"%CD%", "runas", 1:%S%%H%=nothing%BS%&%CS%&%CX%
:2
%E%%~dpnx0 fvcLing admin mode look up&wmic process where name="cmd.exe" CALL setpriority "realtime"& timeout 3 /NOBREAK>nul
:3
%E%x=msgbox("end of line" ,48, "%~n0")%BS%&%CS%&%CX%

convert string array to string

    string ConvertStringArrayToString(string[] array)
    {
        //
        // Concatenate all the elements into a StringBuilder.
        //
        StringBuilder strinbuilder = new StringBuilder();
        foreach (string value in array)
        {
            strinbuilder.Append(value);
            strinbuilder.Append(' ');
        }
        return strinbuilder.ToString();
    }

ImportError: DLL load failed: The specified module could not be found

To make it short, it means that you lacked some "dependencies" for the libraries you wanted to use. Before trying to use any kind of library, first it is suggested to look up whether it needs another library in python "family". What do I mean?

Downloading "dlls" is something that I avoid. I had the same problem with another library "kivy". The problem occurred when I wanted to use Python 3.4v instead of 3.5 Everything was working correctly in 3.5 but I just wanted to use the stable version for kivy which is 3.4 as they officially "advise". So, I switched to 3.4 but then I had the very same "dll" error saying lots of things are missing. So I checked the website and learned that I needed to install extra "dependencies" from the official website of kivy, then the problem got solved.

How do I remove link underlining in my HTML email?

Use text-decoration:none !important; instead of text-decoration:none; to make sure you "lose" the underline.

Java Runtime.getRuntime(): getting output from executing a command line program

Try reading the InputStream of the runtime:

Runtime rt = Runtime.getRuntime();
String[] commands = {"system.exe", "-send", argument};
Process proc = rt.exec(commands);
BufferedReader br = new BufferedReader(
    new InputStreamReader(proc.getInputStream()));
String line;
while ((line = br.readLine()) != null)
    System.out.println(line);

You might also need to read the error stream (proc.getErrorStream()) if the process is printing error output. You can redirect the error stream to the input stream if you use ProcessBuilder.

Vim: insert the same characters across multiple lines

Updated January 2016

Whilst the accepted answer is a great solution, this is actually slightly fewer keystrokes, and scales better - based in principle on the accepted answer.

Move the cursor to the n in name.
Enter visual block mode (ctrlv).
Press 3j
Press I.
Type in vendor_.
Press esc.

Note, this has fewer keystrokes than the accepted answer provided (compare Step 3). We just count the number of j actions to perform.

If you have line numbers enabled (as illustrated above), and know the line number you wish to move to, then step 3 can be changed to #G where # is the wanted line number.

In our example above, this would be 4G. However when dealing with just a few line numbers an explicit count works well.

Understanding Linux /proc/id/maps

Please check: http://man7.org/linux/man-pages/man5/proc.5.html

address           perms offset  dev   inode       pathname
00400000-00452000 r-xp 00000000 08:02 173521      /usr/bin/dbus-daemon

The address field is the address space in the process that the mapping occupies.

The perms field is a set of permissions:

 r = read
 w = write
 x = execute
 s = shared
 p = private (copy on write)

The offset field is the offset into the file/whatever;

dev is the device (major:minor);

inode is the inode on that device.0 indicates that no inode is associated with the memoryregion, as would be the case with BSS (uninitialized data).

The pathname field will usually be the file that is backing the mapping. For ELF files, you can easily coordinate with the offset field by looking at the Offset field in the ELF program headers (readelf -l).

Under Linux 2.0, there is no field giving pathname.

How to remove an app with active device admin enabled on Android?

You could also create a new DevicePolicyManager and then use removeAdmin(adminReceiver) from an onClickListener of a button in your app

//set the onClickListener here
{
   ComponentName devAdminReceiver = new ComponentName(context, deviceAdminReceiver.class);
   DevicePolicyManager dpm = (DevicePolicyManager)context.getSystemService(Context.DEVICE_POLICY_SERVICE);
   dpm.removeActiveAdmin(devAdminReceiver);
}

And then you can uninstall

ASP.NET MVC Razor pass model to layout

Seems like you have modeled your viewmodels a bit wrong if you have this problem.

Personally I would never type a layout page. But if you want to do that you should have a base viewmodel that your other viewmodels inherits from and type your layout to the base viewmodel and you pages to the specific once.

How to connect android emulator to the internet

[EDIT] For more recent version of Android Studio, the emulator you need to use is no longer in the ~/Library/Android/sdk/tools folder but in ~/LibraryAndroid/sdk/emulator. If while trying the below solution you get the following message "PANIC: Missing emulator engine program for 'x86' CPU.”, then please refer to https://stackoverflow.com/a/49511666 to update your bash environment.

Operating System : Mac OS X El Capitan

IDE : Android Studio 2.2

For some reasons, I wasn't able to access internet through my AVD at work (probably proxy or network configuration issues). What did the trick for me was to launch in command line my AVD and giving manually the Google public DNS 8.8.8.8.

In your Terminal go to the folder tools of your Android sdk to find the 'emulator' program:

cd ~/Library/Android/sdk/tools

Then retrieve the name of your AVDs :

emulator -list-avds

It will return you something like this:

Android_Wear_Round_API_23
Nexus_10_API_22
Nexus_5X_API_22
Nexus_5X_API_24
Nexus_9_API_24

Then launch the AVD you would like with the following instructions:

emulator -avd NameOfYourDevice -dns-server 8.8.8.8

Your AVD is launched and you should be able to use internet.

In Java, can you modify a List while iterating through it?

Java 8's stream() interface provides a great way to update a list in place.

To safely update items in the list, use map():

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

// add stuff to list

letters = letters.stream().map(x -> "D").collect(Collectors.toList());

To safely remove items in place, use filter():


letters.stream().filter(x -> !x.equals("A")).collect(Collectors.toList());

cannot connect to pc-name\SQLEXPRESS

Follow these steps then you solve your problem 100%.

When you get this error then close everything(Microsoft SQL Server Managment):

Then open command prompt by pressing (window + r) keys and type services.msc and click OK or press Enter key.
And search **SQL Server (SQLEXPRESS) as I show in the image.

Now see left upper side and click start.
If you open Microsoft SQL Server Management then you not get any type error.

Enjoy!!!

Undefined reference to sqrt (or other mathematical functions)

Here are my observation, firstly you need to include the header math.h as sqrt() function declared in math.h header file. For e.g

#include <math.h>

secondly, if you read manual page of sqrt you will notice this line Link with -lm.

#include <math.h> /* header file you need to include */

double sqrt(double x); /* prototype of sqrt() function */

Link with -lm. /* Library linking instruction */

But application still says undefined reference to sqrt. Do you see any problem here?

Compiler error is correct as you haven't linked your program with library lm & linker is unable to find reference of sqrt(), you need to link it explicitly. For e.g

gcc -Wall -Wextra -Werror -pedantic test.c -lm

In UML class diagrams, what are Boundary Classes, Control Classes, and Entity Classes?

Robustness diagrams are written after use cases and before class diagrams. They help to identify the roles of use case steps. You can use them to ensure your use cases are sufficiently robust to represent usage requirements for the system you're building.

They involve:

Actors
Use Cases
Entities
Boundaries
Controls

Whereas the Model-View-Controller pattern is used for user interfaces, the Entity-Control-Boundary Pattern (ECB) is used for systems. The following aspects of ECB can be likened to an abstract version of MVC, if that's helpful:

UML notation

Entities (model)
Objects representing system data, often from the domain model.

Boundaries (view/service collaborator)
Objects that interface with system actors (e.g. a user or external service). Windows, screens and menus are examples of boundaries that interface with users.

Controls (controller)
Objects that mediate between boundaries and entities. These serve as the glue between boundary elements and entity elements, implementing the logic required to manage the various elements and their interactions. It is important to understand that you may decide to implement controllers within your design as something other than objects – many controllers are simple enough to be implemented as a method of an entity or boundary class for example.

Four rules apply to their communication:

Actors can only talk to boundary objects.
Boundary objects can only talk to controllers and actors.
Entity objects can only talk to controllers.
Controllers can talk to boundary objects and entity objects, and to other controllers, but not to actors

Communication allowed:

         Entity    Boundary   Control
Entity     X                     X
Boundary                         X
Control    X          X          X

Downloading a file from spring controllers

Return ResponseEntity<Resource> from a handler method
Specify Content-Type explicitly
Set Content-Disposition if necessary:
1. filename
2. type
  1. inline to force preview in a browser
  2. attachment to force a download

@Controller
public class DownloadController {
    @GetMapping("/downloadPdf.pdf")
    // 1.
    public ResponseEntity<Resource> downloadPdf() {
        FileSystemResource resource = new FileSystemResource("/home/caco3/Downloads/JMC_Tutorial.pdf");
        // 2.
        MediaType mediaType = MediaTypeFactory
                .getMediaType(resource)
                .orElse(MediaType.APPLICATION_OCTET_STREAM);
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(mediaType);
        // 3
        ContentDisposition disposition = ContentDisposition
                // 3.2
                .inline() // or .attachment()
                // 3.1
                .filename(resource.getFilename())
                .build();
        headers.setContentDisposition(disposition);
        return new ResponseEntity<>(resource, headers, HttpStatus.OK);
    }
}

Explanation

Return ResponseEntity<Resource>

When you return a ResponseEntity<Resource>, the ResourceHttpMessageConverter kicks in and writes an appropriate response.

The resource could be:

Be aware of possibly wrong Content-Type header set (see FileSystemResource is returned with content type json). That's why this answer suggests setting the Content-Type explicitly.

Specify Content-Type explicitly:

Some options are:

hardcode the header
use the MediaTypeFactory from Spring.
or rely on third party library like Apache Tika

The MediaTypeFactory allows to discover the MediaType appropriate for the Resource (see also /org/springframework/http/mime.types file)

Set Content-Disposition if necessary:

Sometimes it is necessary to force a download in a browser or to make the browser open a file as a preview. You can use the Content-Disposition header to satisfy this requirement:

The first parameter in the HTTP context is either inline (default value, indicating it can be displayed inside the Web page, or as the Web page) or attachment (indicating it should be downloaded; most browsers presenting a 'Save as' dialog, prefilled with the value of the filename parameters if present).

In the Spring Framework a ContentDisposition can be used.

To preview a file in a browser:

ContentDisposition disposition = ContentDisposition
        .builder("inline") // Or .inline() if you're on Spring MVC 5.3+
        .filename(resource.getFilename())
        .build();

To force a download:

ContentDisposition disposition = ContentDisposition
        .builder("attachment") // Or .attachment() if you're on Spring MVC 5.3+
        .filename(resource.getFilename())
        .build();

Use InputStreamResource carefully:

Since an InputStream can be read only once, Spring won't write Content-Length header if you return an InputStreamResource (here is a snippet of code from ResourceHttpMessageConverter):

@Override
protected Long getContentLength(Resource resource, @Nullable MediaType contentType) throws IOException {
    // Don't try to determine contentLength on InputStreamResource - cannot be read afterwards...
    // Note: custom InputStreamResource subclasses could provide a pre-calculated content length!
    if (InputStreamResource.class == resource.getClass()) {
        return null;
    }
    long contentLength = resource.contentLength();
    return (contentLength < 0 ? null : contentLength);
}

In other cases it works fine:

~ $ curl -I localhost:8080/downloadPdf.pdf  | grep "Content-Length"
Content-Length: 7554270

Show hide div using codebehind

Hiding on the Client Side with javascript

Using plain old javascript, you can easily hide the same element in this manner:

var myDivElem = document.getElementById("myDiv");
myDivElem.style.display = "none";

Then to show again:

myDivElem.style.display = "";

jQuery makes hiding elements a little simpler if you prefer to use jQuery:

var myDiv = $("#<%=myDiv.ClientID%>");
myDiv.hide();

... and to show:

myDiv.show();

On linux SUSE or RedHat, how do I load Python 2.7

If you can live with 2.6, EPEL has it for RHEL 5 in the python26 package, although you will need to use python2.6 to invoke it since the system will still need python to be 2.4 in order to run.

SCP Permission denied (publickey). on EC2 only when using -r flag on directories

transferring file from local to remote host

scp -i (path of your key) (path for your file to be transferred) (username@ip):(path where file to be copied)

e.g scp -i aws.pem /home/user1/Desktop/testFile   ec2-user@someipAddress:/home/ec2-user/

P.S. - ec2-user@someipAddress of this ip address should have access to the destination folder in my case /home/ec2-user/

I can't understand why this JAXB IllegalAnnotationException is thrown

JAXB (java.xml.bind)

This answer:

JDK 14

Spring Boot WebFlux 2.3.3.RELEASE

Lombok 1.18.12

Work for me >>>>> JDK 14

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.3.3</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
    <version>3.0.0-M4</version>
</dependency>

So Dependencies(jaxb-api, jaxb-impl, jaxb-runtime)

I try to test every version.

Body Request:

<?xml version="1.0" encoding="UTF-8"?>
<service generator="zend" version="1.0">
    <send>
        <message>OK</message>
        <status>success</status>
    </send>
</service>

DTO:

import lombok.Getter;
import lombok.Setter;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;
import java.util.ArrayList;
import java.util.List;

public class SmsSend {
    
    @Getter
    @Setter
    @XmlRootElement(name = "service")
    public static class ReplyMethodSend {
        private List<ReplyValue> send = new ArrayList<>();
    }

    @Getter
    @Setter
    @XmlAccessorType(XmlAccessType.FIELD)
    public static class ReplyValue {
        private String message;
        private String status;
    }
}

Response:

{
    "send": [
        {
        "message": "OK",
        "status": "success"
        }
    ]
}

Have fun with programming ^__^

Is there a wikipedia API just for retrieve content summary?

You can also get content such as the first pagagraph via DBPedia which takes Wikipedia content and creates structured information from it (RDF) and makes this available via an API. The DBPedia API is a SPARQL one (RDF-based) but it outputs JSON and it is pretty easy to wrap.

As an example here's a super simple JS library named WikipediaJS that can extract structured content including a summary first paragraph: http://okfnlabs.org/wikipediajs/

The JS library code can be found here: https://github.com/okfn/wikipediajs/blob/master/wikipedia.js

Retrieve WordPress root directory path?

If you have WordPress bootstrap loaded you can use get_home_path() function to get path to the WordPress root directory.

Is there a Google Chrome-only CSS hack?

Only Chrome CSS hack:

@media all and (-webkit-min-device-pixel-ratio:0) and (min-resolution: .001dpcm) {
    #selector {
        background: red;
    }
}

How to initialise memory with new operator in C++?

std::fill is one way. Takes two iterators and a value to fill the region with. That, or the for loop, would (I suppose) be the more C++ way.

For setting an array of primitive integer types to 0 specifically, memset is fine, though it may raise eyebrows. Consider also calloc, though it's a bit inconvenient to use from C++ because of the cast.

For my part, I pretty much always use a loop.

(I don't like to second-guess people's intentions, but it is true that std::vector is, all things being equal, preferable to using new[].)

Difference between a View's Padding and Margin

In simple words:

Padding - creates space inside the view's border.
Margin - creates space outside the view's border.

Get Context in a Service

Service extends ContextWrapper
ContextWrapper extends Context

So....

Context context = this;

(in Service or Activity Class)

Flexbox not working in Internet Explorer 11

I have tested a full layout using flexbox it contains header, footer, main body with left, center and right panels and the panels can contain menu items or footer and headers that should scroll. Pretty complex

IE11 and even IE EDGE have some problems displaying the flex content but it can be overcome. I have tested it in most browsers and it seems to work.

Some fixed i have applies are IE11 height bug, Adding height:100vh and min-height:100% to the html/body. this also helps to not have to set height on container in the dom. Also make the body/html a flex container. Otherwise IE11 will compress the view.

html,body {
    display: flex;
    flex-flow:column nowrap;
    height:100vh; /* fix IE11 */
    min-height:100%; /* fix IE11 */  
}

A fix for IE EDGE that overflows the flex container: overflow:hidden on main flex container. if you remove the overflow, IE EDGE wil push the content out of the viewport instead of containing it inside the flex main container.

main{
    flex:1 1 auto;
    overflow:hidden; /* IE EDGE overflow fix */  
}

You can see my testing and example on my codepen page. I remarked the important css parts with the fixes i have applied and hope someone finds it useful.

How to truncate the time on a DateTime object in Python?

You can use datetime.strftime to extract the day, the month, the year...

Example :

from datetime import datetime
d = datetime.today()

# Retrieves the day and the year
print d.strftime("%d-%Y")

Output (for today):

29-2011

If you just want to retrieve the day, you can use day attribute like :

from datetime import datetime
d = datetime.today()

# Retrieves the day
print d.day

Ouput (for today):

How to search for a part of a word with ElasticSearch

Searching with leading and trailing wildcards is going to be extremely slow on a large index. If you want to be able to search by word prefix, remove leading wildcard. If you really need to find a substring in a middle of a word, you would be better of using ngram tokenizer.

UTF-8 encoded html pages show ? (questions marks) instead of characters

When [dropping] the encoding settings mentioned above all characters [are rendered] correctly but the encoding that is detected shows either windows-1252 or ISO-8859-1 depending on the browser.

Then that's what you're really sending. None of the encoding settings in your bullet list will actually modify your output in any way; all they do is tell the browser what encoding to assume when interpreting what you send. That's why you're getting those ?s - you're telling the browser that what you're sending is UTF-8, but it's really ISO-8859-1.

R dplyr: Drop multiple columns

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

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

Send parameter to Bootstrap modal window?

There is a better solution than the accepted answer, specifically using data-* attributes. Setting the id to 1 will cause you issues if any other element on the page has id=1. Instead, you can do:

<button class="btn btn-primary" data-toggle="modal" data-target="#yourModalID" data-yourparameter="whateverYouWant">Load</button>

<script>
$('#yourModalID').on('show.bs.modal', function(e) {
  var yourparameter = e.relatedTarget.dataset.yourparameter;
  // Do some stuff w/ it.
});
</script>

XPath - Difference between node() and text()

Select the text of all items under produce:

//produce/item/text()

Select all the manager nodes in all departments:

//department/*

R define dimensions of empty data frame

I have come across the same problem and have a cleaner solution. Instead of creating an empty data.frame you can instead save your data as a named list. Once you have added all results to this list you convert it to a data.frame after.

For the case of adding features one at a time this works best.

mylist = list()
for(column in 1:10) mylist$column = rnorm(10)
mydf = data.frame(mylist)

For the case of adding rows one at a time this becomes tricky due to mixed types. If all types are the same it is easy.

mylist = list()
for(row in 1:10) mylist$row = rnorm(10)
mydf = data.frame(do.call(rbind, mylist))

I haven't found a simple way to add rows of mixed types. In this case, if you must do it this way, the empty data.frame is probably the best solution.

Load image from url

URL url = new URL("http://image10.bizrate-images.com/resize?sq=60&uid=2216744464");
Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
imageView.setImageBitmap(bmp);

How to convert a data frame column to numeric type?

If the dataframe has multiple types of columns, some characters, some numeric try the following to convert just the columns that contain numeric values to numeric:

for (i in 1:length(data[1,])){
  if(length(as.numeric(data[,i][!is.na(data[,i])])[!is.na(as.numeric(data[,i][!is.na(data[,i])]))])==0){}
  else {
    data[,i]<-as.numeric(data[,i])
  }
}

CSS text-decoration underline color

(for fellow googlers, copied from duplicate question) This answer is outdated since text-decoration-color is now supported by most modern browsers.

You can do this via the following CSS rule as an example:

text-decoration-color:green

If this rule isn't supported by an older browser, you can use the following solution:

Setting your word with a border-bottom:

a:link {
  color: red;
  text-decoration: none;
  border-bottom: 1px solid blue;
}
a:hover {
 border-bottom-color: green;
}

MySQL and PHP - insert NULL rather than empty string

Normally, you add regular values to mySQL, from PHP like this:

function addValues($val1, $val2) {
    db_open(); // just some code ot open the DB 
    $query = "INSERT INTO uradmonitor (db_value1, db_value2) VALUES ('$val1', '$val2')";
    $result = mysql_query($query);
    db_close(); // just some code to close the DB
}

When your values are empty/null ($val1=="" or $val1==NULL), and you want NULL to be added to SQL and not 0 or empty string, to the following:

function addValues($val1, $val2) {
    db_open(); // just some code ot open the DB 
    $query = "INSERT INTO uradmonitor (db_value1, db_value2) VALUES (".
        (($val1=='')?"NULL":("'".$val1."'")) . ", ".
        (($val2=='')?"NULL":("'".$val2."'")) . 
        ")";
    $result = mysql_query($query);
    db_close(); // just some code to close the DB
}

Note that null must be added as "NULL" and not as "'NULL'" . The non-null values must be added as "'".$val1."'", etc.

Hope this helps, I just had to use this for some hardware data loggers, some of them collecting temperature and radiation, others only radiation. For those without the temperature sensor I needed NULL and not 0, for obvious reasons ( 0 is an accepted temperature value also).

`export const` vs. `export default` in ES6

When you put default, its called default export. You can only have one default export per file and you can import it in another file with any name you want. When you don't put default, its called named export, you have to import it in another file using the same name with curly braces inside it.

Linux Command History with date and time

Regarding this link you can make the first solution provided by krzyk permanent by executing:

echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile
source ~/.bash_profile

Filter dict to contain only certain keys?

Constructing a new dict:

dict_you_want = { your_key: old_dict[your_key] for your_key in your_keys }

Uses dictionary comprehension.

If you use a version which lacks them (ie Python 2.6 and earlier), make it dict((your_key, old_dict[your_key]) for ...). It's the same, though uglier.

Note that this, unlike jnnnnn's version, has stable performance (depends only on number of your_keys) for old_dicts of any size. Both in terms of speed and memory. Since this is a generator expression, it processes one item at a time, and it doesn't looks through all items of old_dict.

Removing everything in-place:

unwanted = set(keys) - set(your_dict)
for unwanted_key in unwanted: del your_dict[unwanted_key]

How to make VS Code to treat other file extensions as certain language?

This works for me.

{
"files.associations": {"*.bitesize": "yaml"}
 }

Does Python have an argc argument?

You're better off looking at argparse for argument parsing.

http://docs.python.org/dev/library/argparse.html

Just makes it easy, no need to do the heavy lifting yourself.

Twitter Bootstrap 3: how to use media queries?

Bootstrap primarily uses the following media query ranges—or breakpoints—in our source Sass files for our layout, grid system, and components.

Extra small devices (portrait phones, less than 576px) No media query for xs since this is the default in Bootstrap

Small devices (landscape phones, 576px and up)

@media (min-width: 576px) { ... }

Medium devices (tablets, 768px and up)

@media (min-width: 768px) { ... }

Large devices (desktops, 992px and up)

@media (min-width: 992px) { ... }

Extra large devices (large desktops, 1200px and up)

@media (min-width: 1200px) { ... }

Since we write our source CSS in Sass, all our media queries are available via Sass mixins:

No media query necessary for xs breakpoint as it's effectively @media (min-width: 0) { ... }

@include media-breakpoint-up(sm) { ... }
@include media-breakpoint-up(md) { ... }
@include media-breakpoint-up(lg) { ... }
@include media-breakpoint-up(xl) { ... }

For understand it deeply please go through below link

https://getbootstrap.com/docs/4.3/layout/overview/

Compare two DataFrames and output their differences side-by-side

I have faced this issue, but found an answer before finding this post :

Based on unutbu's answer, load your data...

import pandas as pd
import io

texts = ['''\
id   Name   score                    isEnrolled                       Date
111  Jack                            True              2013-05-01 12:00:00
112  Nick   1.11                     False             2013-05-12 15:05:23
     Zoe    4.12                     True                                  ''',

         '''\
id   Name   score                    isEnrolled                       Date
111  Jack   2.17                     True              2013-05-01 12:00:00
112  Nick   1.21                     False                                
     Zoe    4.12                     False             2013-05-01 12:00:00''']


df1 = pd.read_fwf(io.StringIO(texts[0]), widths=[5,7,25,17,20], parse_dates=[4])
df2 = pd.read_fwf(io.StringIO(texts[1]), widths=[5,7,25,17,20], parse_dates=[4])

...define your diff function...

def report_diff(x):
    return x[0] if x[0] == x[1] else '{} | {}'.format(*x)

Then you can simply use a Panel to conclude :

my_panel = pd.Panel(dict(df1=df1,df2=df2))
print my_panel.apply(report_diff, axis=0)

#          id  Name        score    isEnrolled                       Date
#0        111  Jack   nan | 2.17          True        2013-05-01 12:00:00
#1        112  Nick  1.11 | 1.21         False  2013-05-12 15:05:23 | NaT
#2  nan | nan   Zoe         4.12  True | False  NaT | 2013-05-01 12:00:00

By the way, if you're in IPython Notebook, you may like to use a colored diff function to give colors depending whether cells are different, equal or left/right null :

from IPython.display import HTML
pd.options.display.max_colwidth = 500  # You need this, otherwise pandas
#                          will limit your HTML strings to 50 characters

def report_diff(x):
    if x[0]==x[1]:
        return unicode(x[0].__str__())
    elif pd.isnull(x[0]) and pd.isnull(x[1]):
        return u'<table style="background-color:#00ff00;font-weight:bold;">'+\
            '<tr><td>%s</td></tr><tr><td>%s</td></tr></table>' % ('nan', 'nan')
    elif pd.isnull(x[0]) and ~pd.isnull(x[1]):
        return u'<table style="background-color:#ffff00;font-weight:bold;">'+\
            '<tr><td>%s</td></tr><tr><td>%s</td></tr></table>' % ('nan', x[1])
    elif ~pd.isnull(x[0]) and pd.isnull(x[1]):
        return u'<table style="background-color:#0000ff;font-weight:bold;">'+\
            '<tr><td>%s</td></tr><tr><td>%s</td></tr></table>' % (x[0],'nan')
    else:
        return u'<table style="background-color:#ff0000;font-weight:bold;">'+\
            '<tr><td>%s</td></tr><tr><td>%s</td></tr></table>' % (x[0], x[1])

HTML(my_panel.apply(report_diff, axis=0).to_html(escape=False))

How do I concatenate a boolean to a string in Python?

answer = True
myvar = "the answer is " + str(answer)

myvar = "the answer is %s" % answer

Using "Object.create" instead of "new"

With only one level of inheritance, your example may not let you see the real benefits of Object.create.

This methods allows you to easily implement differential inheritance, where objects can directly inherit from other objects.

On your userB example, I don't think that your init method should be public or even exist, if you call again this method on an existing object instance, the id and name properties will change.

Object.create lets you initialize object properties using its second argument, e.g.:

var userB = {
  sayHello: function() {
    console.log('Hello '+ this.name);
  }
};

var bob = Object.create(userB, {
  'id' : {
    value: MY_GLOBAL.nextId(),
    enumerable:true // writable:false, configurable(deletable):false by default
  },
  'name': {
    value: 'Bob',
    enumerable: true
  }
});

As you can see, the properties can be initialized on the second argument of Object.create, with an object literal using a syntax similar to the used by the Object.defineProperties and Object.defineProperty methods.

It lets you set the property attributes (enumerable, writable, or configurable), which can be really useful.

Eclipse Indigo - Cannot install Android ADT Plugin

Execute eclipse with root level

$sudo /opt/eclipse/eclipse

ImportError: No module named PyQt4

You have to check which Python you are using. I had the same problem because the Python I was using was not the same one that brew was using. In your command line:

which python
output: /usr/bin/python
which brew
output: /usr/local/bin/brew //so they are different
cd /usr/local/lib/python2.7/site-packages
ls //you can see PyQt4 and sip are here
Now you need to add usr/local/lib/python2.7/site-packages to your python path.
open ~/.bash_profile //you will open your bash_profile file in your editor
Add 'export PYTHONPATH=/usr/local/lib/python2.7/site-packages:$PYTHONPATH' to your bash file and save it
Close your terminal and restart it to reload the shell
python
import PyQt4 // it is ok now

Inversion of Control vs Dependency Injection

DI and IOC are two design pattern that mainly focusing on providing loose coupling between components, or simply a way in which we decouple the conventional dependency relationships between object so that the objects are not tight to each other.

With following examples, I am trying to explain both these concepts.

Previously we are writing code like this

Public MyClass{
 DependentClass dependentObject
 /*
  At somewhere in our code we need to instantiate 
  the object with new operator  inorder to use it or perform some method.
  */ 
  dependentObject= new DependentClass();
  dependentObject.someMethod();
}

With Dependency injection, the dependency injector will take care of the instantiation of objects

Public MyClass{
 /* Dependency injector will instantiate object*/
 DependentClass dependentObject

 /*
  At somewhere in our code we perform some method. 
  The process of  instantiation will be handled by the dependency injector
 */ 

  dependentObject.someMethod();
}

The above process of giving the control to some other (for example the container) for the instantiation and injection can be termed as Inversion of Control and the process in which the IOC container inject the dependency for us can be termed as dependency injection.

IOC is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, program controls the flow by reducing the overhead to the programmer.and the process used by the program to inject dependency is termed as DI

The two concepts work together providing us with a way to write much more flexible, reusable, and encapsulated code, which make them as important concepts in designing object-oriented solutions.

Also Recommend to read.

What is dependency injection?

You can also check one of my similar answer here

Difference between Inversion of Control & Dependency Injection

No function matches the given name and argument types

That error means that a function call is only matched by an existing function if all its arguments are of the same type and passed in same order. So if the next f() function

create function f() returns integer as $$ 
    select 1;
$$ language sql;

is called as

select f(1);

It will error out with

ERROR:  function f(integer) does not exist
LINE 1: select f(1);
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

because there is no f() function that takes an integer as argument.

So you need to carefully compare what you are passing to the function to what it is expecting. That long list of table columns looks like bad design.

Solution for "Fatal error: Maximum function nesting level of '100' reached, aborting!" in PHP

Rather than going for a recursive function calls, work with a queue model to flatten the structure.

$queue = array('http://example.com/first/url');
while (count($queue)) {
    $url = array_shift($queue);

    $queue = array_merge($queue, find_urls($url));
}

function find_urls($url)
{
    $urls = array();

    // Some logic filling the variable

    return $urls;
}

There are different ways to handle it. You can keep track of more information if you need some insight about the origin or paths traversed. There are also distributed queues that can work off a similar model.

Pagination response payload from a RESTful API

ReSTful APIs are consumed primarily by other systems, which is why I put paging data in the response headers. However, some API consumers may not have direct access to the response headers, or may be building a UX over your API, so providing a way to retrieve (on demand) the metadata in the JSON response is a plus.

I believe your implementation should include machine-readable metadata as a default, and human-readable metadata when requested. The human-readable metadata could be returned with every request if you like or, preferably, on-demand via a query parameter, such as include=metadata or include_metadata=true.

In your particular scenario, I would include the URI for each product with the record. This makes it easy for the API consumer to create links to the individual products. I would also set some reasonable expectations as per the limits of my paging requests. Implementing and documenting default settings for page size is an acceptable practice. For example, GitHub's API sets the default page size to 30 records with a maximum of 100, plus sets a rate limit on the number of times you can query the API. If your API has a default page size, then the query string can just specify the page index.

In the human-readable scenario, when navigating to /products?page=5&per_page=20&include=metadata, the response could be:

{
  "_metadata": 
  {
      "page": 5,
      "per_page": 20,
      "page_count": 20,
      "total_count": 521,
      "Links": [
        {"self": "/products?page=5&per_page=20"},
        {"first": "/products?page=0&per_page=20"},
        {"previous": "/products?page=4&per_page=20"},
        {"next": "/products?page=6&per_page=20"},
        {"last": "/products?page=26&per_page=20"},
      ]
  },
  "records": [
    {
      "id": 1,
      "name": "Widget #1",
      "uri": "/products/1"
    },
    {
      "id": 2,
      "name": "Widget #2",
      "uri": "/products/2"
    },
    {
      "id": 3,
      "name": "Widget #3",
      "uri": "/products/3"
    }
  ]
}

For machine-readable metadata, I would add Link headers to the response:

Link: </products?page=5&perPage=20>;rel=self,</products?page=0&perPage=20>;rel=first,</products?page=4&perPage=20>;rel=previous,</products?page=6&perPage=20>;rel=next,</products?page=26&perPage=20>;rel=last

(the Link header value should be urlencoded)

...and possibly a custom total-count response header, if you so choose:

total-count: 521

The other paging data revealed in the human-centric metadata might be superfluous for machine-centric metadata, as the link headers let me know which page I am on and the number per page, and I can quickly retrieve the number of records in the array. Therefore, I would probably only create a header for the total count. You can always change your mind later and add more metadata.

As an aside, you may notice I removed /index from your URI. A generally accepted convention is to have your ReST endpoint expose collections. Having /index at the end muddies that up slightly.

These are just a few things I like to have when consuming/creating an API. Hope that helps!

Is there a way to iterate over a range of integers?

package main

import "fmt"

func main() {

    nums := []int{2, 3, 4}
    for _, num := range nums {
       fmt.Println(num, sum)    
    }
}

What is the non-jQuery equivalent of '$(document).ready()'?

This works perfectly, from ECMA

document.addEventListener("DOMContentLoaded", function() {
  // code...
});

The window.onload doesn't equal to JQuery $(document).ready because $(document).ready waits only to the DOM tree while window.onload check all elements including external assets and images.

EDIT: Added IE8 and older equivalent, thanks to Jan Derk's observation. You may read the source of this code on MDN at this link:

// alternative to DOMContentLoaded
document.onreadystatechange = function () {
    if (document.readyState == "interactive") {
        // Initialize your application or run some code.
    }
}

There are other options apart from "interactive". See the MDN link for details.

How to get character for a given ascii value

Here's a function that works for all 256 bytes, and ensures you'll see a character for each value:

static char asciiSymbol( byte val )
{
    if( val < 32 ) return '.';  // Non-printable ASCII
    if( val < 127 ) return (char)val;   // Normal ASCII
    // Workaround the hole in Latin-1 code page
    if( val == 127 ) return '.';
    if( val < 0x90 ) return "€.‚ƒ„…†‡ˆ‰Š‹Œ.Ž."[ val & 0xF ];
    if( val < 0xA0 ) return ".‘’“”•–—˜™š›œ.žŸ"[ val & 0xF ];
    if( val == 0xAD ) return '.';   // Soft hyphen: this symbol is zero-width even in monospace fonts
    return (char)val;   // Normal Latin-1
}

Protect image download

Try this one-

<script>
    (function($){
      $(document).on('contextmenu', 'img', function() {
          return false;
      })
    })(jQuery);
  </script>

Executing <script> injected by innerHTML after AJAX call

This worked for me by calling eval on each script content from ajax .done :

$.ajax({}).done(function (data) {      
    $('div#content script').each(function (index, element) { eval(element.innerHTML); 
})

Note: I didn't write parameters to $.ajax which you have to adjust according to your ajax.

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.

WELD-001408: Unsatisfied dependencies for type Customer with qualifiers @Default

I had the same problem but it had nothing to do with annotations. The problem happened while indexing beans in my container (Jboss EAP 6.3). One of my beans could not be indexed because it used Java 8 features an I got this sneaky little warning while deploying:

WARN [org.jboss.as.server.deployment] ... Could not index class ... java.lang.IllegalStateException: Unknown tag! pos=20 poolCount = 133

Then at the injection point I got the error:

Unsatisfied dependencies for type ... with qualifiers @Default

The solution is to update the Java annotations index. download new version of jandex (jandex-1.2.3.Final or newer) then put it into

JBOSS_HOME\modules\system\layers\base\org\jboss\jandex\main and then update reference to the new file in module.xml

NOTE: EAP 6.4.x already have this fixed

How to stop an animation (cancel() does not work)

To stop animation you may set such objectAnimator that do nothing, e.g.

first when manual flipping there is animation left to right:

flipper.setInAnimation(leftIn);
flipper.setOutAnimation(rightOut);

then when switching to auto flipping there's no animation

flipper.setInAnimation(doNothing);
flipper.setOutAnimation(doNothing);

doNothing = ObjectAnimator.ofFloat(flipper, "x", 0f, 0f).setDuration(flipperSwipingDuration);

"CSV file does not exist" for a filename with embedded quotes

Sometimes we ignore a little bit issue which is not a Python or IDE fault its logical error We assumed a file .csv which is not a .csv file its a Excell Worksheet file have a look

When you try to open that file using Import compiler will through the error have a look

To Resolve the issue

open your Target file into Microsoft Excell and save that file in .csv format it is important to note that Encoding is important because it will help you to open the file when you try to open it with

with open('YourTargetFile.csv','r',encoding='UTF-8') as file:

So you are set to go now Try to open your file as this

import csv
with open('plain.csv','r',encoding='UTF-8') as file:
load = csv.reader(file)
for line in load:
    print(line)

Here is the Output

What is the difference between up-casting and down-casting with respect to class variable

Parent: Car
Child: Figo
Car c1 = new Figo();

=====
Upcasting:-
Method: Object c1 will refer to Methods of Class (Figo - Method must be overridden) because class "Figo" is specified with "new".
Instance Variable: Object c1 will refer to instance variable of Declaration Class ("Car").

When Declaration class is parent and object is created of child then implicit casting happens which is "Upcasting".

======
Downcasting:-
Figo f1 = (Figo) c1; //
Method: Object f1 will refer to Method of Class (figo) as initial object c1 is created with class "Figo". but once down casting is done, methods which are only present in class "Figo" can also be referred by variable f1.
Instance Variable: Object f1 will not refer to instance variable of Declaration class of object c1 (declaration class for c1 is CAR) but with down casting it will refer to instance variables of class Figo.

======
Use: When Object is of Child Class and declaration class is Parent and Child class wants to access Instance variable of it's own class and not of parent class then it can be done with "Downcasting".

Disabled form fields not submitting data

We can also use the readonly only with below attributes -

readonly onclick='return false;'

This is because if we will only use the readonly then radio buttons will be editable. To avoid this situation we can use readonly with above combination. It will restrict the editing and element's values will also passed during form submission.

Equivalent of "continue" in Ruby

Writing Ian Purton's answer in a slightly more idiomatic way:

(1..5).each do |x|
  next if x < 2
  puts x
end

Prints:

How can jQuery deferred be used?

This is a self-promotional answer, but I spent a few months researching this and presented the results at jQuery Conference San Francisco 2012.

Here is a free video of the talk:

https://www.youtube.com/watch?v=juRtEEsHI9E

How do I retrieve my MySQL username and password?

Save the file. For this example, the file will be named C:\mysql-init.txt. it asking administrative permisions for saving the file

How to Increase browser zoom level on page load?

The difference between sys.stdout.write and print?

A difference between print and sys.stdout.write to point out in Python 3, is also the value which is returned when executed in the terminal. In Python 3, sys.stdout.write returns the length of the string whereas print returns just None.

So for example running following code interactively in the terminal would print out the string followed by its length, since the length is returned and output when run interactively:

>>> sys.stdout.write(" hi ")
 hi 4

Search All Fields In All Tables For A Specific Value (Oracle)

I did some modification to the above code to make it work faster if you are searching in only one owner. You just have to change the 3 variables v_owner, v_data_type and v_search_string to fit what you are searching for.

SET SERVEROUTPUT ON SIZE 100000

DECLARE
  match_count INTEGER;
-- Type the owner of the tables you are looking at
  v_owner VARCHAR2(255) :='ENTER_USERNAME_HERE';

-- Type the data type you are look at (in CAPITAL)
-- VARCHAR2, NUMBER, etc.
  v_data_type VARCHAR2(255) :='VARCHAR2';

-- Type the string you are looking at
  v_search_string VARCHAR2(4000) :='string to search here...';

BEGIN
  FOR t IN (SELECT table_name, column_name FROM all_tab_cols where owner=v_owner and data_type = v_data_type) LOOP

    EXECUTE IMMEDIATE 
    'SELECT COUNT(*) FROM '||t.table_name||' WHERE '||t.column_name||' = :1'
    INTO match_count
    USING v_search_string;

    IF match_count > 0 THEN
      dbms_output.put_line( t.table_name ||' '||t.column_name||' '||match_count );
    END IF;

  END LOOP;
END;
/

How can I know when an EditText loses focus?

Its Working Properly

EditText et_mobile= (EditText) findViewById(R.id.edittxt);

et_mobile.setOnFocusChangeListener(new OnFocusChangeListener() {          
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (!hasFocus) {
            // code to execute when EditText loses focus
            if (et_mobile.getText().toString().trim().length() == 0) {
                CommonMethod.showAlert("Please enter name", FeedbackSubmtActivity.this);
            }
        }
    }
});



public static void showAlert(String message, Activity context) {

    final AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setMessage(message).setCancelable(false)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {

                }
            });
    try {
        builder.show();
    } catch (Exception e) {
        e.printStackTrace();
    }

}

How to make HTML open a hyperlink in another window or tab?

Simplest way is to add a target tag.

<a href="http://www.starfall.com/" target="Starfall">Starfall</a>

Use a different value for the target attribute for each link if you want them to open in different tabs, the same value for the target attribute if you want them to replace the other ones.

Xcode 10, Command CodeSign failed with a nonzero exit code

This worked for me :) I removed the certificate in keychain access settings. Go to Xcode and clean build the app. Now certificate is again created in keychain access and build gets succeeded with real device.

Change private static final field using Java reflection

If the value assigned to a static final boolean field is known at compile-time, it is a constant. Fields of primitive or String type can be compile-time constants. A constant will be inlined in any code that references the field. Since the field is not actually read at runtime, changing it then will have no effect.

The Java language specification says this:

If a field is a constant variable (§4.12.4), then deleting the keyword final or changing its value will not break compatibility with pre-existing binaries by causing them not to run, but they will not see any new value for the usage of the field unless they are recompiled. This is true even if the usage itself is not a compile-time constant expression (§15.28)

Here's an example:

class Flag {
  static final boolean FLAG = true;
}

class Checker {
  public static void main(String... argv) {
    System.out.println(Flag.FLAG);
  }
}

If you decompile Checker, you'll see that instead of referencing Flag.FLAG, the code simply pushes a value of 1 (true) onto the stack (instruction #3).

0:   getstatic       #2; //Field java/lang/System.out:Ljava/io/PrintStream;
3:   iconst_1
4:   invokevirtual   #3; //Method java/io/PrintStream.println:(Z)V
7:   return

Is there a way to instantiate a class by name in Java?

Use java reflection

Creating New Objects There is no equivalent to method invocation for constructors, because invoking a constructor is equivalent to creating a new object (to be the most precise, creating a new object involves both memory allocation and object construction). So the nearest equivalent to the previous example is to say:

import java.lang.reflect.*;

   public class constructor2 {
      public constructor2()
      {
      }

      public constructor2(int a, int b)
      {
         System.out.println(
           "a = " + a + " b = " + b);
      }

      public static void main(String args[])
      {
         try {
           Class cls = Class.forName("constructor2");
           Class partypes[] = new Class[2];
            partypes[0] = Integer.TYPE;
            partypes[1] = Integer.TYPE;
            Constructor ct 
              = cls.getConstructor(partypes);
            Object arglist[] = new Object[2];
            arglist[0] = new Integer(37);
            arglist[1] = new Integer(47);
            Object retobj = ct.newInstance(arglist);
         }
         catch (Throwable e) {
            System.err.println(e);
         }
      }
   }

which finds a constructor that handles the specified parameter types and invokes it, to create a new instance of the object. The value of this approach is that it's purely dynamic, with constructor lookup and invocation at execution time, rather than at compilation time.

Copy and paste content from one file to another file in vi

If you want to copy a part of a file and paste that content in the middle of another file, you can do this way.

:linenumber,linenumber write newfile

Example:

:2,34 write temp1

:'mark, 'mark write newfile

Example:

:'a,'b write temp1

Now the lines are copied to another file. If you want to delete those lines after copying, you can do

:linenumber1,linenumber2 d

:'mark1,'mark2 d

Now, go to other file. Then keep the cursor on the line where you wanted to paste.

Type

:r!cat temp1

Now, the content of the temp file is pasted here. You can delete the temp file from the command line itself, after pasting the content.

:!rm temp1

This would help if you wanted to copy and paste several times.

How can I change the width and height of slides on Slick Carousel?

I made this plugin. There is some css interference taking place.

It's your border on the slider itself. Either use

box-sizing: border-box

to absorb the border width, or put the border on the content inside the slide.

Display calendar to pick a date in java

The LGoodDatePicker library includes a (swing) DatePicker component, which allows the user to choose dates from a calendar. (By default, the users can also type dates from the keyboard, but keyboard entry can be disabled if desired). The DatePicker has automatic data validation, which means (among other things) that any date that the user enters will always be converted to your desired date format.

Fair disclosure: I'm the primary developer.

Since the DatePicker is a swing component, you can add it to any other swing container including (in your scenario) the cells of a JTable.

The most commonly used date formats are automatically supported, and additional date formats can be added if desired.

To enforce your desired date format, you would most likely want to set your chosen format to be the default "display format" for the DatePicker. Formats can be specified by using the Java 8 DateTimeFormatter Patterns. No matter what the user types (or clicks), the date will always be converted to the specified format as soon as the user is done.

Besides the DatePicker, the library also has the TimePicker and DateTimePicker components. I pasted screenshots of all the components (and the demo program) below.

The library can be installed into your Java project from the project release page.

The project home page is on Github at:
https://github.com/LGoodDatePicker/LGoodDatePicker .

DateTimePicker screenshot

DateTimePicker examples

Demo screenshot

What is the difference between a generative and a discriminative algorithm?

Here's the most important part from the lecture notes of CS299 (by Andrew Ng) related to the topic, which really helps me understand the difference between discriminative and generative learning algorithms.

Suppose we have two classes of animals, elephant (y = 1) and dog (y = 0). And x is the feature vector of the animals.

Given a training set, an algorithm like logistic regression or the perceptron algorithm (basically) tries to find a straight line — that is, a decision boundary — that separates the elephants and dogs. Then, to classify a new animal as either an elephant or a dog, it checks on which side of the decision boundary it falls, and makes its prediction accordingly. We call these discriminative learning algorithm.

Here's a different approach. First, looking at elephants, we can build a model of what elephants look like. Then, looking at dogs, we can build a separate model of what dogs look like. Finally, to classify a new animal, we can match the new animal against the elephant model, and match it against the dog model, to see whether the new animal looks more like the elephants or more like the dogs we had seen in the training set. We call these generative learning algorithm.

How to convert an array of strings to an array of floats in numpy?

Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (or equivalently, use a list comprehension). (In Python 3, you'll need to call list on the map return value if you use map, since map returns an iterator now.)

However, if it's already a numpy array of strings, there's a better way. Use astype().

import numpy as np
x = np.array(['1.1', '2.2', '3.3'])
y = x.astype(np.float)

How to Clone Objects

This code worked for me. It also takes a very small amount of time to execute.

    public static void CopyTo(this object Source, object Destination)
    {
        foreach (var pS in Source.GetType().GetProperties())
        {
            foreach (var pT in Destination.GetType().GetProperties())
            {
                if (pT.Name != pS.Name) continue;
                (pT.GetSetMethod()).Invoke(Destination, new object[]
                { pS.GetGetMethod().Invoke( Source, null ) });
                break;
            }
        };
    }

Make Bootstrap Popover Appear/Disappear on Hover instead of Click

After trying a few of these answers and finding they don't scale well with multiple links (for example the accepted answer requires a line of jquery for every link you have), I came across a way that requires minimal code to get working, and it also appears to work perfectly, at least on Chrome.

You add this line to activate it:

$('[data-toggle="popover"]').popover();

And these settings to your anchor links:

data-toggle="popover" data-trigger="hover"

See it in action here, I'm using the same imports as the accepted answer so it should work fine on older projects.

mysql query result into php array

Use mysql_fetch_assoc instead of mysql_fetch_array

http://php.net/manual/en/function.mysql-fetch-assoc.php

Parameter binding on left joins with array in Laravel Query Builder

You don't have to bind parameters if you use query builder or eloquent ORM. However, if you use DB::raw(), ensure that you binding the parameters.

Try the following:

$array = array(1,2,3);       $query = DB::table('offers');             $query->select('id', 'business_id', 'address_id', 'title', 'details', 'value', 'total_available', 'start_date', 'end_date', 'terms', 'type', 'coupon_code', 'is_barcode_available', 'is_exclusive', 'userinformations_id', 'is_used');             $query->leftJoin('user_offer_collection', function ($join) use ($array)             {                 $join->on('user_offer_collection.offers_id', '=', 'offers.id')                       ->whereIn('user_offer_collection.user_id', $array);             });       $query->get();

AWS S3: how do I see how much disk space is using

In addition to Christopher's answer.

If you need to count total size of versioned bucket use:

aws s3api list-object-versions --bucket BUCKETNAME --output json --query "[sum(Versions[].Size)]"

It counts both Latest and Archived versions.

Databound drop down list - initial value

hi friend in this case you can use the

AppendDataBound="true"

and after this use the list item. for e.g.:

<asp:DropDownList ID="DropDownList1" runat="server" AppendDataBoundItems="true">
    <asp:ListItem Text="--Select One--" Value="" />   
</asp:DropDownList>

but the problem in this is after second time select data are append with old data.

How can I fix assembly version conflicts with JSON.NET after updating NuGet package references in a new ASP.NET MVC 5 project?

Here the steps I used to fix the warning:

Unload project in VS
Edit .csproj file
Search for all references to Newtonsoft.Json assembly
- Found two, one to v6 and one to v5
- Replace the reference to v5 with v6
Reload project
Build and notice assembly reference failure
View References and see that there are now two to Newtonsoft.Json. Remove the one that's failing to resolve.
Rebuild - no warnings

What is the difference between JDK and JRE?

A clear understanding of these terms(JVM, JDK, JRE) are essential to grasp their usage and differences.

JVM Java Virtual Machine (JVM) is a run-time system that executes Java bytecode. The JVM is like a virtual computer that can execute a set of compiled instructions and manipulate memory locations. When a Java compiler compiles source code, it generates a highly optimized set of instructions called bytecode in a .class file. The JVM interprets these bytecode instructions and converts them to machine-specific code for execution.

JDK The Java Development Kit (JDK) is a software development environment that you can use to develop and execute Java applications. It includes the JRE and a set of programming tools, such as a Java compiler, interpreter, appletviewer, and document viewer. The JDK is implemented through the Java SE, Java EE, or Java ME platforms.

JRE The Java Runtime Environment (JRE) is a part of the JDK that includes a JVM, core classes, and several libraries that support application development. Though the JRE is available as part of the JDK, you can also download and use it separately.

For complete understanding you can see my Blog : Jdk Jre Jvm and differences

How can I preview a merge in git?

Maybe this can help you ? git-diff-tree - Compares the content and mode of blobs found via two tree objects

Why is super.super.method(); not allowed in Java?

@Jon Skeet Nice explanation. IMO if some one wants to call super.super method then one must be want to ignore the behavior of immediate parent, but want to access the grand parent behavior. This can be achieved through instance Of. As below code

public class A {
    protected void printClass() {
        System.out.println("In A Class");
    }
}

public class B extends A {

    @Override
    protected void printClass() {
        if (!(this instanceof C)) {
            System.out.println("In B Class");
        }
        super.printClass();
    }
}

public class C extends B {
    @Override
    protected void printClass() {
        System.out.println("In C Class");
        super.printClass();
    }
}

Here is driver class,

public class Driver {
    public static void main(String[] args) {
        C c = new C();
        c.printClass();
    }
}

Output of this will be

In C Class
In A Class

Class B printClass behavior will be ignored in this case. I am not sure about is this a ideal or good practice to achieve super.super, but still it is working.

Reading data from XML

I don't think you can "legally" load only part of an XML file, since then it would be malformed (there would be a missing closing element somewhere).

Using LINQ-to-XML, you can do var doc = XDocument.Load("yourfilepath"). From there its just a matter of querying the data you want, say like this:

var authors = doc.Root.Elements().Select( x => x.Element("Author") );

HTH.

EDIT:

Okay, just to make this a better sample, try this (with @JWL_'s suggested improvement):

using System;
using System.Xml.Linq;

namespace ConsoleApplication1 {
    class Program {
        static void Main( string[] args )  {
            XDocument doc = XDocument.Load( "XMLFile1.xml" );
            var authors = doc.Descendants( "Author" );
            foreach ( var author in authors ) {
                Console.WriteLine( author.Value );
            }
            Console.ReadLine();
        }
    }
}

You will need to adjust the path in XDocument.Load() to point to your XML file, but the rest should work. Ask questions about which parts you don't understand.

Android device is not connected to USB for debugging (Android studio)

Windows, many times it will not recognize the device fully and because of driver issues, the device won't show up.

1).go to settings

2).control panel

3).hardware and sound

4).device manager

Make new column in Panda dataframe by adding values from other columns

The simplest way would be to use DeepSpace answer. However, if you really want to use an anonymous function you can use apply:

df['C'] = df.apply(lambda row: row['A'] + row['B'], axis=1)

Count number of vector values in range with R

Use which:

 set.seed(1)
 x <- sample(10, 50, replace = TRUE)
 length(which(x > 3 & x < 5))
 # [1]  6

Error: Cannot find module 'ejs'

I my case, I just added ejs manually in package.json:

 {
   "name": "myApp"
   "dependencies": {
     "express": "^4.12.2",
     "ejs": "^1.0.0"
   }
 }

And run npm install (may be you need run it with sudo) Please note, that ejs looks views directory by default

execute shell command from android

Process p;
StringBuffer output = new StringBuffer();
try {
    p = Runtime.getRuntime().exec(params[0]);
    BufferedReader reader = new BufferedReader(
            new InputStreamReader(p.getInputStream()));
    String line = "";
    while ((line = reader.readLine()) != null) {
        output.append(line + "\n");
        p.waitFor();
    }
} 
catch (IOException e) {
    e.printStackTrace();
} catch (InterruptedException e) {
    e.printStackTrace();
}
String response = output.toString();
return response;

How to find the default JMX port number?

Now I need to connect that application from my local computer, but I don't know the JMX port number of the remote computer. Where can I find it? Or, must I restart that application with some VM parameters to specify the port number?

By default JMX does not publish on a port unless you specify the arguments from this page: How to activate JMX...

-Dcom.sun.management.jmxremote # no longer required for JDK6
-Dcom.sun.management.jmxremote.port=9010
-Dcom.sun.management.jmxremote.local.only=false # careful with security implications
-Dcom.sun.management.jmxremote.authenticate=false # careful with security implications

If you are running you should be able to access any of those system properties to see if they have been set:

if (System.getProperty("com.sun.management.jmxremote") == null) {
    System.out.println("JMX remote is disabled");
} else [
    String portString = System.getProperty("com.sun.management.jmxremote.port");
    if (portString != null) {
        System.out.println("JMX running on port "
            + Integer.parseInt(portString));
    }
}

Depending on how the server is connected, you might also have to specify the following parameter. As part of the initial JMX connection, jconsole connects up to the RMI port to determine which port the JMX server is running on. When you initially start up a JMX enabled application, it looks its own hostname to determine what address to return in that initial RMI transaction. If your hostname is not in /etc/hosts or if it is set to an incorrect interface address then you can override it with the following:

-Djava.rmi.server.hostname=<IP address>

As an aside, my SimpleJMX package allows you to define both the JMX server and the RMI port or set them both to the same port. The above port defined with com.sun.management.jmxremote.port is actually the RMI port. This tells the client what port the JMX server is running on.

Git pushing to remote branch

Simply push this branch to a different branch name

 git push -u origin localBranch:remoteBranch

How do I filter ForeignKey choices in a Django ModelForm?

This is simple, and works with Django 1.4:

class ClientAdminForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(ClientAdminForm, self).__init__(*args, **kwargs)
        # access object through self.instance...
        self.fields['base_rate'].queryset = Rate.objects.filter(company=self.instance.company)

class ClientAdmin(admin.ModelAdmin):
    form = ClientAdminForm
    ....

You don't need to specify this in a form class, but can do it directly in the ModelAdmin, as Django already includes this built-in method on the ModelAdmin (from the docs):

ModelAdmin.formfield_for_foreignkey(self, db_field, request, **kwargs)¶
'''The formfield_for_foreignkey method on a ModelAdmin allows you to 
   override the default formfield for a foreign keys field. For example, 
   to return a subset of objects for this foreign key field based on the
   user:'''

class MyModelAdmin(admin.ModelAdmin):
    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if db_field.name == "car":
            kwargs["queryset"] = Car.objects.filter(owner=request.user)
        return super(MyModelAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

An even niftier way to do this (for example in creating a front-end admin interface that users can access) is to subclass the ModelAdmin and then alter the methods below. The net result is a user interface that ONLY shows them content that is related to them, while allowing you (a super-user) to see everything.

I've overridden four methods, the first two make it impossible for a user to delete anything, and it also removes the delete buttons from the admin site.

The third override filters any query that contains a reference to (in the example 'user' or 'porcupine' (just as an illustration).

The last override filters any foreignkey field in the model to filter the choices available the same as the basic queryset.

In this way, you can present an easy to manage front-facing admin site that allows users to mess with their own objects, and you don't have to remember to type in the specific ModelAdmin filters we talked about above.

class FrontEndAdmin(models.ModelAdmin):
    def __init__(self, model, admin_site):
        self.model = model
        self.opts = model._meta
        self.admin_site = admin_site
        super(FrontEndAdmin, self).__init__(model, admin_site)

remove 'delete' buttons:

    def get_actions(self, request):
        actions = super(FrontEndAdmin, self).get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

prevents delete permission

    def has_delete_permission(self, request, obj=None):
        return False

filters objects that can be viewed on the admin site:

    def get_queryset(self, request):
        if request.user.is_superuser:
            try:
                qs = self.model.objects.all()
            except AttributeError:
                qs = self.model._default_manager.get_queryset()
            return qs

        else:
            try:
                qs = self.model.objects.all()
            except AttributeError:
                qs = self.model._default_manager.get_queryset()

            if hasattr(self.model, ‘user’):
                return qs.filter(user=request.user)
            if hasattr(self.model, ‘porcupine’):
                return qs.filter(porcupine=request.user.porcupine)
            else:
                return qs

filters choices for all foreignkey fields on the admin site:

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if request.employee.is_superuser:
            return super(FrontEndAdmin, self).formfield_for_foreignkey(db_field, request, **kwargs)

        else:
            if hasattr(db_field.rel.to, 'user'):
                kwargs["queryset"] = db_field.rel.to.objects.filter(user=request.user)
            if hasattr(db_field.rel.to, 'porcupine'):
                kwargs["queryset"] = db_field.rel.to.objects.filter(porcupine=request.user.porcupine)
            return super(ModelAdminFront, self).formfield_for_foreignkey(db_field, request, **kwargs)

How do I check if an object's type is a particular subclass in C++?

In c# you can simply say:

if (myObj is Car) {

}

An efficient way to transpose a file in Bash

I was looking for a solution to transpose any kind of matrix (nxn or mxn) with any kind of data (numbers or data) and got the following solution:

Row2Trans=number1
Col2Trans=number2

for ((i=1; $i <= Line2Trans; i++));do
    for ((j=1; $j <=Col2Trans ; j++));do
        awk -v var1="$i" -v var2="$j" 'BEGIN { FS = "," }  ; NR==var1 {print $((var2)) }' $ARCHIVO >> Column_$i
    done
done

paste -d',' `ls -mv Column_* | sed 's/,//g'` >> $ARCHIVO

Is there any ASCII character for <br>?

No, there isn't.

<br> is an HTML ELEMENT. It can't be replaced by a text node or part of a text node.

You can create a new-line effect using CR/LF inside a <pre> element like below:

_x000D_

<pre>Line 1_x000D_
Line 2</pre>

_x000D_

But this is not the same as a <br>.

What is the first character in the sort order used by Windows Explorer?

I know it's an old question, but it's easy to check this out. Just create a folder with a bunch of dummy files whose names are each character on the keyboard. Of course, you can't really use \ | / : * ? " < > and leading and trailing blanks are a terrible idea.

If you do this, and it looks like no one did, you find that the Windows sort order for the FIRST character is 1. Special characters 2. Numbers 3. Letters

But for subsequent characters, it seems to be 1. Numbers 2. Special characters 3. Letters

Numbers are kind of weird, thanks to the "Improvements" made after the Y2K non-event. Special characters you would think would sort in ASCII order, but there are exceptions, notably the first two, apostrophe and dash, and the last two, plus and equals. Also, I have heard but not actually seen something about dashes being ignored. That is, in fact, NOT my experience.

So, ShxFee, I assume you meant the sort should be ascending, not descending, and the top-most (first) character in the sort order for the first character of the name is the apostrophe.

As NigelTouch said, special characters do not sort to ASCII, but my notes above specify exactly what does and does not sort in normal ASCII order. But he is certainly wrong about special characters always sorting first. As I noted above, that only appears to be true for the first character of the name.

CSS get height of screen resolution

You can bind the current height and width of the screen to css variables: var(--screen-x) and var(--screen-y) with this javascript:

var root = document.documentElement;

document.addEventListener('resize', () => {
  root.style.setProperty('--screen-x', window.screenX)
  root.style.setProperty('--screen-y', window.screenY)
})

This was directly adapted from lea verou's example in her talk on css variables here: https://leaverou.github.io/css-variables/#slide31

How to set min-font-size in CSS

.class {
    font-size: clamp(minimum-size, prefered-size, maximum-size)
}

using this you could set it up so prefered and max values are 5vw but the minimum is 15px or something so it won't go over 5vw but if 5vw < 15px it will stick to 15px

Concatenate strings from several rows using Pandas groupby

If you want to concatenate your "text" in a list:

df.groupby(['name', 'month'], as_index = False).agg({'text': list})

Output in a table format in Java's System.out

Check out the class java.util.Formatter.

PHP date yesterday

strtotime(), as in date("F j, Y", strtotime("yesterday"));

how to check for special characters php

preg_match('/'.preg_quote('^\'£$%^&*()}{@#~?><,@|-=-_+-¬', '/').'/', $string);

javascript - pass selected value from popup window to parent window input box

If you want a popup window rather than a <div />, I would suggest the following approach.

In your parent page, you call a small helper method to show the popup window:

<input type="button" name="choice" onClick="selectValue('sku1')" value="?">

Add the following JS methods:

function selectValue(id)
{
    // open popup window and pass field id
    window.open('sku.php?id=' + encodeURIComponent(id),'popuppage',
      'width=400,toolbar=1,resizable=1,scrollbars=yes,height=400,top=100,left=100');
}

function updateValue(id, value)
{
    // this gets called from the popup window and updates the field with a new value
    document.getElementById(id).value = value;
}

Your sku.php receives the selected field via $_GET['id'] and uses it to construct the parent callback function:

?>
<script type="text/javascript">
function sendValue(value)
{
    var parentId = <?php echo json_encode($_GET['id']); ?>;
    window.opener.updateValue(parentId, value);
    window.close();
}
</script>

For each row in your popup, change code to this:

<td><input type=button value="Select" onClick="sendValue('<?php echo $rows['packcode']; ?>')" /></td>

Following this approach, the popup window doesn't need to know how to update fields in the parent form.

Multi-line string with extra space (preserved indentation)

If you're trying to get the string into a variable, another easy way is something like this:

USAGE=$(cat <<-END
    This is line one.
    This is line two.
    This is line three.
END
)

If you indent your string with tabs (i.e., '\t'), the indentation will be stripped out. If you indent with spaces, the indentation will be left in.

NOTE: It is significant that the last closing parenthesis is on another line. The END text must appear on a line by itself.

swift How to remove optional String Character

You need to unwrap the optional before you try to use it via string interpolation. The safest way to do that is via optional binding:

if let color = colorChoiceSegmentedControl.titleForSegmentAtIndex(colorChoiceSegmentedControl.selectedSegmentIndex) {
    println(color) // "Red"

    let imageURLString = "http://hahaha.com/ha.php?color=\(color)"
    println(imageURLString) // http://hahaha.com/ha.php?color=Red
}

how to implement Interfaces in C++?

There is no concept of interface in C++,
You can simulate the behavior using an Abstract class.
Abstract class is a class which has atleast one pure virtual function, One cannot create any instances of an abstract class but You could create pointers and references to it. Also each class inheriting from the abstract class must implement the pure virtual functions in order that it's instances can be created.

Difference in make_shared and normal shared_ptr in C++

The difference is that std::make_shared performs one heap-allocation, whereas calling the std::shared_ptr constructor performs two.

Where do the heap-allocations happen?

std::shared_ptr manages two entities:

the control block (stores meta data such as ref-counts, type-erased deleter, etc)
the object being managed

std::make_shared performs a single heap-allocation accounting for the space necessary for both the control block and the data. In the other case, new Obj("foo") invokes a heap-allocation for the managed data and the std::shared_ptr constructor performs another one for the control block.

For further information, check out the implementation notes at cppreference.

Update I: Exception-Safety

NOTE (2019/08/30): This is not a problem since C++17, due to the changes in the evaluation order of function arguments. Specifically, each argument to a function is required to fully execute before evaluation of other arguments.

Since the OP seem to be wondering about the exception-safety side of things, I've updated my answer.

Consider this example,

void F(const std::shared_ptr<Lhs> &lhs, const std::shared_ptr<Rhs> &rhs) { /* ... */ }

F(std::shared_ptr<Lhs>(new Lhs("foo")),
  std::shared_ptr<Rhs>(new Rhs("bar")));

Because C++ allows arbitrary order of evaluation of subexpressions, one possible ordering is:

new Lhs("foo"))
new Rhs("bar"))
std::shared_ptr<Lhs>
std::shared_ptr<Rhs>

Now, suppose we get an exception thrown at step 2 (e.g., out of memory exception, Rhs constructor threw some exception). We then lose memory allocated at step 1, since nothing will have had a chance to clean it up. The core of the problem here is that the raw pointer didn't get passed to the std::shared_ptr constructor immediately.

One way to fix this is to do them on separate lines so that this arbitary ordering cannot occur.

auto lhs = std::shared_ptr<Lhs>(new Lhs("foo"));
auto rhs = std::shared_ptr<Rhs>(new Rhs("bar"));
F(lhs, rhs);

The preferred way to solve this of course is to use std::make_shared instead.

F(std::make_shared<Lhs>("foo"), std::make_shared<Rhs>("bar"));

Update II: Disadvantage of `std::make_shared`

Quoting Casey's comments:

Since there there's only one allocation, the pointee's memory cannot be deallocated until the control block is no longer in use. A weak_ptr can keep the control block alive indefinitely.

Why do instances of `weak_ptr`s keep the control block alive?

There must be a way for weak_ptrs to determine if the managed object is still valid (eg. for lock). They do this by checking the number of shared_ptrs that own the managed object, which is stored in the control block. The result is that the control blocks are alive until the shared_ptr count and the weak_ptr count both hit 0.

Back to `std::make_shared`

Since std::make_shared makes a single heap-allocation for both the control block and the managed object, there is no way to free the memory for control block and the managed object independently. We must wait until we can free both the control block and the managed object, which happens to be until there are no shared_ptrs or weak_ptrs alive.

Suppose we instead performed two heap-allocations for the control block and the managed object via new and shared_ptr constructor. Then we free the memory for the managed object (maybe earlier) when there are no shared_ptrs alive, and free the memory for the control block (maybe later) when there are no weak_ptrs alive.

How to import existing Android project into Eclipse?

I had the problem of getting errors when checking out an Android project from SVN. This is what I did and the whole thing settled down.
1. checkout the project from SVN as we normally do any other project
2. right click and get properties of the project
3. In the java build path->order and export tab select the android API and OK it

this removed all the project issues
so far so good but not sure if this is the 100% correct method

Undo a merge by pull request?

There is a better answer to this problem, though I could just break this down step-by-step.

You will need to fetch and checkout the latest upstream changes like so, e.g.:

git fetch upstream
git checkout upstream/master -b revert/john/foo_and_bar

Taking a look at the commit log, you should find something similar to this:

commit b76a5f1f5d3b323679e466a1a1d5f93c8828b269
Merge: 9271e6e a507888
Author: Tim Tom <[email protected]>
Date:   Mon Apr 29 06:12:38 2013 -0700

    Merge pull request #123 from john/foo_and_bar

    Add foo and bar

commit a507888e9fcc9e08b658c0b25414d1aeb1eef45e
Author: John Doe <[email protected]>
Date:   Mon Apr 29 12:13:29 2013 +0000

    Add bar

commit 470ee0f407198057d5cb1d6427bb8371eab6157e
Author: John Doe <[email protected]>
Date:   Mon Apr 29 10:29:10 2013 +0000

    Add foo

Now you want to revert the entire pull request with the ability to unrevert later. To do so, you will need to take the ID of the merge commit.

In the above example the merge commit is the top one where it says "Merged pull request #123...".

Do this to revert the both changes ("Add bar" and "Add foo") and you will end up with in one commit reverting the entire pull request which you can unrevert later on and keep the history of changes clean:

git revert -m 1 b76a5f1f5d3b323679e466a1a1d5f93c8828b269

Set up adb on Mac OS X

MacPorts

It seems like android-platform-tools was first added to MacPorts only very recently — in 2018-10-20, under java/android-platform-tools/Portfile:

It would appear that it relies on a compiled binary that's provided by Google; it would appear that the source code for the binary might not be available.

The `adb` binary

Reverse-engineering the android-platform-tools/Portfile from above reveals that the following archive is fetched from Google in order to build the port:

https://dl.google.com/android/repository/platform-tools_r28.0.1-darwin.zip

The abd binary is pre-compiled, available in platform-tools/adb within the above archive, which is a Mach-O 64-bit executable x86_64, as per file(1). It's ready to be used and doesn't seem to have any external dependencies (e.g., doesn't look like it depends on java or anything).

Using `adb`

In order to use adb to restart the device, for example, in case the power button is stuck, the following steps could be used:

cd /tmp
curl https://dl.google.com/android/repository/platform-tools_r28.0.1-darwin.zip -o apt.zip
unzip apt.zip
./platform-tools/adb devices
./platform-tools/adb reboot

Upon first use since a reboot, you also have to first confirm the pairing with the phone through the Allow USB debugging? popup on the phone (phone has to have USB debugging enabled through the Developer Options, no root access required).

Are members of a C++ struct initialized to 0 by default?

I believe the correct answer is that their values are undefined. Often, they are initialized to 0 when running debug versions of the code. This is usually not the case when running release versions.

EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) on dispatch_semaphore_dispose

Sometimes all it takes to get a EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) is a missing return statement.

It certainly was my case.

How to run Gulp tasks sequentially one after the other

The only good solution to this problem can be found in the gulp documentation:

var gulp = require('gulp');

// takes in a callback so the engine knows when it'll be done
gulp.task('one', function(cb) {
  // do stuff -- async or otherwise
  cb(err); // if err is not null and not undefined, the orchestration will stop, and 'two' will not run
});

// identifies a dependent task must be complete before this one begins
gulp.task('two', ['one'], function() {
  // task 'one' is done now
});

gulp.task('default', ['one', 'two']);
// alternatively: gulp.task('default', ['two']);

How to access shared folder without giving username and password

You need to go to user accounts and enable Guest Account, its default disabled. Once you do this, you share any folder and add the guest account to the list of users who can accesss that specific folder, this also includes to Turn off password Protected Sharing in 'Advanced Sharing Settings'

The other way to do this where you only enter a password once is to join a Homegroup. if you have a network of 2 or more computers, they can all connect to a homegroup and access all the files they need from each other, and anyone outside the group needs a 1 time password to be able to access your network, this was introduced in windows 7.

Load a WPF BitmapImage from a System.Drawing.Bitmap

Thanks to Hallgrim, here is the code I ended up with:

ScreenCapture = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
   bmp.GetHbitmap(), 
   IntPtr.Zero, 
   System.Windows.Int32Rect.Empty, 
   BitmapSizeOptions.FromWidthAndHeight(width, height));

I also ended up binding to a BitmapSource instead of a BitmapImage as in my original question

How to change 1 char in the string?

While it does not answer the OP's question precisely, depending on what you're doing it might be a good solution. Below is going to solve my problem.

Let's say that you have to do a lot of individual manipulation of various characters in a string. Instead of using a string the whole time use a char[] array while you're doing the manipulation. Because you can do this:

 char[] array = "valta is the best place in the World".ToCharArray();

Then manipulate to your hearts content as much as you need...

 array[0] = "M";

Then convert it to a string once you're done and need to use it as a string:

string str = new string(array);

PHP Composer update "cannot allocate memory" error (using Laravel 4)

Here are the steps to fix the problem: (instant fast SWAP file allocation method used)

Server SWAP Setup (Ubuntu 16.04 SWAP to Fix Out of Memory Errors)

Check if you have swap already, memory and disk size:

    sudo swapon -s
    free -m
    df -h

Make swap file: (change 1G to 4G if you want 4GB SWAP memory)

    sudo fallocate -l 1G /swapfile

Check swap file:

    ls -lh /swapfile

Assign Swap File:

    sudo chmod 600 /swapfile
    sudo mkswap /swapfile
    sudo swapon /swapfile

Check if swap OK, memory and disk size:

    sudo swapon -s
    free -m
    df -h

Attach Swap File on System Restart:

    sudo nano /etc/fstab
        /swapfile   none    swap    sw    0   0

Adjust Swap File Settings:

    cat /proc/sys/vm/swappiness
    cat /proc/sys/vm/vfs_cache_pressure

    sudo sysctl vm.swappiness=10
    sudo sysctl vm.vfs_cache_pressure=50

    sudo nano /etc/sysctl.conf

SWAP File Priority: (0-100% => 0: Don't put to swap, 100: Put on SWAP and free the RAM)

        vm.swappiness=10

Remove inode from cache: (100: system removes inode information from the cache too quickly)

        vm.vfs_cache_pressure = 50

What are the differences between a multidimensional array and an array of arrays in C#?

I am parsing .il files generated by ildasm to build a database of assemnblies, classes, methods, and stored procedures for use doing a conversion. I came across the following, which broke my parsing.

.method private hidebysig instance uint32[0...,0...] 
        GenerateWorkingKey(uint8[] key,
                           bool forEncryption) cil managed

The book Expert .NET 2.0 IL Assembler, by Serge Lidin, Apress, published 2006, Chapter 8, Primitive Types and Signatures, pp. 149-150 explains.

<type>[] is termed a Vector of <type>,

<type>[<bounds> [<bounds>**] ] is termed an array of <type>

** means may be repeated, [ ] means optional.

Examples: Let <type> = int32.

1) int32[...,...] is a two-dimensional array of undefined lower bounds and sizes

2) int32[2...5] is a one-dimensional array of lower bound 2 and size 4.

3) int32[0...,0...] is a two-dimensional array of lower bounds 0 and undefined size.

Tom

php resize image on upload

Here is another nice and easy solution:

$maxDim = 800;
$file_name = $_FILES['myFile']['tmp_name'];
list($width, $height, $type, $attr) = getimagesize( $file_name );
if ( $width > $maxDim || $height > $maxDim ) {
    $target_filename = $file_name;
    $ratio = $width/$height;
    if( $ratio > 1) {
        $new_width = $maxDim;
        $new_height = $maxDim/$ratio;
    } else {
        $new_width = $maxDim*$ratio;
        $new_height = $maxDim;
    }
    $src = imagecreatefromstring( file_get_contents( $file_name ) );
    $dst = imagecreatetruecolor( $new_width, $new_height );
    imagecopyresampled( $dst, $src, 0, 0, 0, 0, $new_width, $new_height, $width, $height );
    imagedestroy( $src );
    imagepng( $dst, $target_filename ); // adjust format as needed
    imagedestroy( $dst );
}

Reference: PHP resize image proportionally with max width or weight

Edit: Cleaned up and simplified the code a bit. Thanks @jan-mirus for your comment.

StringLength vs MaxLength attributes ASP.NET MVC with Entity Framework EF Code First

MaxLengthAttribute means Max. length of array or string data allowed

StringLengthAttribute means Min. and max. length of characters that are allowed in a data field

Visit http://joeylicc.wordpress.com/2013/06/20/asp-net-mvc-model-validation-using-data-annotations/

How to copy text from a div to clipboard

Non of all these ones worked for me. But I found a duplicate of the question which the anaswer worked for me.

Here is the link

How do I copy to the clipboard in JavaScript?

Remove an element from a Bash array

This is a quick-and-dirty solution that will work in simple cases but will break if (a) there are regex special characters in $delete, or (b) there are any spaces at all in any items. Starting with:

array+=(pluto)
array+=(pippo)
delete=(pluto)

Delete all entries exactly matching $delete:

array=(`echo $array | fmt -1 | grep -v "^${delete}$" | fmt -999999`)

resulting in echo $array -> pippo, and making sure it's an array: echo $array[1] -> pippo

fmt is a little obscure: fmt -1 wraps at the first column (to put each item on its own line. That's where the problem arises with items in spaces.) fmt -999999 unwraps it back to one line, putting back the spaces between items. There are other ways to do that, such as xargs.

Addendum: If you want to delete just the first match, use sed, as described here:

array=(`echo $array | fmt -1 | sed "0,/^${delete}$/{//d;}" | fmt -999999`)

No == operator found while comparing structs in C++

You need to explicitly define operator == for MyStruct1.

struct MyStruct1 {
  bool operator == (const MyStruct1 &rhs) const
  { /* your logic for comparision between "*this" and "rhs" */ }
};

Now the == comparison is legal for 2 such objects.

get dictionary value by key

static String findFirstKeyByValue(Dictionary<string, string> Data_Array, String value)
{
    if (Data_Array.ContainsValue(value))
    {
        foreach (String key in Data_Array.Keys)
        {
            if (Data_Array[key].Equals(value))
                return key;
        }
    }
    return null;
}

Disable F5 and browser refresh using JavaScript

You can directly use hotkey from rich faces if you are using JSF.

<rich:hotKey key="backspace" onkeydown="if (event.keyCode == 8) return false;" handler="return false;" disableInInput="true" />
<rich:hotKey key="f5" onkeydown="if (event.keyCode == 116) return false;" handler="return false;" disableInInput="true" />
<rich:hotKey key="ctrl+R" onkeydown="if (event.keyCode == 123) return false;" handler="return false;" disableInInput="true" />
<rich:hotKey key="ctrl+f5" onkeydown="if (event.keyCode == 154) return false;" handler="return false;" disableInInput="true" />

Getting the array length of a 2D array in Java

It was really hard to remember that

    int numberOfColumns = arr.length;
    int numberOfRows = arr[0].length;

Let's understand why this is so and how we can figure this out when we're given an array problem. From the below code we can see that rows = 4 and columns = 3:

    int[][] arr = { {1, 1, 1, 1}, 

                    {2, 2, 2, 2}, 

                    {3, 3, 3, 3} };

arr has multiple arrays in it, and these arrays can be arranged in a vertical manner to get the number of columns. To get the number of rows, we need to access the first array and consider its length. In this case, we access [1, 1, 1, 1] and thus, the number of rows = 4. When you're given a problem where you can't see the array, you can visualize the array as a rectangle with n X m dimensions and conclude that we can get the number of rows by accessing the first array then its length. The other one (arr.length) is for the columns.

How do I pass along variables with XMLHTTPRequest

Manually formatting the query string is fine for simple situations. But it can become tedious when there are many parameters.

You could write a simple utility function that handles building the query formatting for you.

function formatParams( params ){
  return "?" + Object
        .keys(params)
        .map(function(key){
          return key+"="+encodeURIComponent(params[key])
        })
        .join("&")
}

And you would use it this way to build a request.

var endpoint = "https://api.example.com/endpoint"
var params = {
  a: 1, 
  b: 2,
  c: 3
}

var url = endpoint + formatParams(params)
//=> "https://api.example.com/endpoint?a=1&b=2&c=3"

There are many utility functions available for manipulating URL's. If you have JQuery in your project you could give http://api.jquery.com/jquery.param/ a try.

It is similar to the above example function, but handles recursively serializing nested objects and arrays.

Python Flask, how to set content type

Usually you don’t have to create the Response object yourself because make_response() will take care of that for you.

from flask import Flask, make_response                                      
app = Flask(__name__)                                                       

@app.route('/')                                                             
def index():                                                                
    bar = '<body>foo</body>'                                                
    response = make_response(bar)                                           
    response.headers['Content-Type'] = 'text/xml; charset=utf-8'            
    return response

One more thing, it seems that no one mentioned the after_this_request, I want to say something:

after_this_request

Executes a function after this request. This is useful to modify response objects. The function is passed the response object and has to return the same or a new one.

so we can do it with after_this_request, the code should look like this:

from flask import Flask, after_this_request
app = Flask(__name__)

@app.route('/')
def index():
    @after_this_request
    def add_header(response):
        response.headers['Content-Type'] = 'text/xml; charset=utf-8'
        return response
    return '<body>foobar</body>'

Android: How can I pass parameters to AsyncTask's onPreExecute()?

You can override the constructor. Something like:

private class MyAsyncTask extends AsyncTask<Void, Void, Void> {

    public MyAsyncTask(boolean showLoading) {
        super();
        // do stuff
    }

    // doInBackground() et al.
}

Then, when calling the task, do something like:

new MyAsyncTask(true).execute(maybe_other_params);

Edit: this is more useful than creating member variables because it simplifies the task invocation. Compare the code above with:

MyAsyncTask task = new MyAsyncTask();
task.showLoading = false;
task.execute();

How can I cast int to enum?

enter image description here

To convert a string to ENUM or int to ENUM constant we need to use Enum.Parse function. Here is a youtube video https://www.youtube.com/watch?v=4nhx4VwdRDk which actually demonstrate's with string and the same applies for int.

The code goes as shown below where "red" is the string and "MyColors" is the color ENUM which has the color constants.

MyColors EnumColors = (MyColors)Enum.Parse(typeof(MyColors), "Red");

How to use WebRequest to POST some data and read response?

Here's what works for me. I'm sure it can be improved, so feel free to make suggestions or edit to make it better.

const string WEBSERVICE_URL = "http://localhost/projectname/ServiceName.svc/ServiceMethod";
//This string is untested, but I think it's ok.
string jsonData = "{ \"key1\" : \"value1\", \"key2\":\"value2\"  }"; 
try
{       
    var webRequest = System.Net.WebRequest.Create(WEBSERVICE_URL);
    if (webRequest != null)
    {
        webRequest.Method = "POST";
        webRequest.Timeout = 20000;
        webRequest.ContentType = "application/json";

    using (System.IO.Stream s = webRequest.GetRequestStream())
    {
        using (System.IO.StreamWriter sw = new System.IO.StreamWriter(s))
            sw.Write(jsonData);
    }

    using (System.IO.Stream s = webRequest.GetResponse().GetResponseStream())
    {
        using (System.IO.StreamReader sr = new System.IO.StreamReader(s))
        {
            var jsonResponse = sr.ReadToEnd();
            System.Diagnostics.Debug.WriteLine(String.Format("Response: {0}", jsonResponse));
        }
    }
}
}
catch (Exception ex)
{
    System.Diagnostics.Debug.WriteLine(ex.ToString());
}

WAMP Server ERROR "Forbidden You don't have permission to access /phpmyadmin/ on this server."

In your apache config file (../bin/apachex.y.z/cong/httpd.conf)

Just change

< Directory "c:/wamp/www/" > ...
...

"Require local" ===> "Require all granted"
< /Directory >

This allows other pc's to access (to read) your web folder.

Warning: The method assertEquals from the type Assert is deprecated

You're using junit.framework.Assert instead of org.junit.Assert.

Can I automatically increment the file build version when using Visual Studio?

Set the version number to "1.0.*" and it will automatically fill in the last two number with the date (in days from some point) and the time (half the seconds from midnight)

Programs & Examples On #Autonomy

How to shutdown my Jenkins safely?

ImportError: numpy.core.multiarray failed to import

PHP - Getting the index of a element from a array

Stored procedure or function expects parameter which is not supplied

Hide scroll bar, but while still being able to scroll

How to change background color in the Notepad++ text editor?

Set Focus on EditText

How can I make a program wait for a variable change in javascript?

Find all files in a directory with extension .txt in Python

How can I check if my Element ID has focus?

Mockito: Mock private field initialization

Why do you need to invoke an anonymous function on the same line?

Required attribute HTML5

What's the difference between next() and nextLine() methods from Scanner class?

Can I prevent text in a div block from overflowing?

'IF' in 'SELECT' statement - choose output value based on column values

How do I make WRAP_CONTENT work on a RecyclerView

convert string to specific datetime format?

Jenkins not executing jobs (pending - waiting for next executor)

Using Server.MapPath in external C# Classes in ASP.NET

How do I run a single test using Jest?

What exactly is Spring Framework for?

Spring (Dependency Injection) approach

Difference between frontend, backend, and middleware in web development

jquery stop child triggering parent event

What's the difference between select_related and prefetch_related in Django ORM?

Gson: Is there an easier way to serialize a map

Default

Using enableComplexMapKeySerialization

Excel Date to String conversion

Chart won't update in Excel (2007)

do <something> N times (declarative syntax)

Is there any difference between "!=" and "<>" in Oracle Sql?

how to delete the content of text file without deleting itself

Add Facebook Share button to static HTML page

Spring not autowiring in unit tests with JUnit

Error in installation a R package

Best way to represent a Grid or Table in AngularJS with Bootstrap 3?

Generating HTML email body in C#

Get remote registry value

Remove First and Last Character C++

Add 2 hours to current time in MySQL?

How do I convert an integer to binary in JavaScript?

Finish all previous activities

How to auto-size an iFrame?

Lowercase and Uppercase with jQuery

RSA encryption and decryption in Python

In git, what is the difference between merge --squash and rebase?

proper hibernate annotation for byte[]

How to redirect to action from JavaScript method?

How to make the first option of <select> selected with jQuery

Why is reading lines from stdin much slower in C++ than Python?

How do I create batch file to rename large number of files in a folder?

How do I get LaTeX to hyphenate a word that contains a dash?

How to get a list of column names on Sqlite3 database?

How to remove constraints from my MySQL table?

How do I select an element in jQuery by using a variable for the ID?

I didn't find "ZipFile" class in the "System.IO.Compression" namespace

How to reload/refresh jQuery dataTable?

Cannot find or open the PDB file in Visual Studio C++ 2010

Use mysql_fetch_array() with foreach() instead of while()

Angular: conditional class with *ngClass

How to detect Ctrl+V, Ctrl+C using JavaScript?

How to run vbs as administrator from vbs?

convert string array to string

ImportError: DLL load failed: The specified module could not be found

How do I remove link underlining in my HTML email?

Java Runtime.getRuntime(): getting output from executing a command line program

Vim: insert the same characters across multiple lines

Understanding Linux /proc/id/maps

How to remove an app with active device admin enabled on Android?

ASP.NET MVC Razor pass model to layout

How to connect android emulator to the internet

In Java, can you modify a List while iterating through it?

cannot connect to pc-name\SQLEXPRESS

Undefined reference to sqrt (or other mathematical functions)

In UML class diagrams, what are Boundary Classes, Control Classes, and Entity Classes?

Downloading a file from spring controllers

Explanation

Using `enableComplexMapKeySerialization`