Programs & Examples On #Clipped

How to make a view with rounded corners?

In Android L you will be able to just use View.setClipToOutline to get that effect. In previous versions there is no way to just clip the contents of a random ViewGroup in a certain shape.

You will have to think of something that would give you a similar effect:

  • If you only need rounded corners in the ImageView, you can use a shader to 'paint' the image over the shape you are using as background. Take a look at this library for an example.

  • If you really need every children to be clipped, maybe you can another view over your layout? One with a background of whatever color you are using, and a round 'hole' in the middle? You could actually create a custom ViewGroup that draws that shape over every children overriding the onDraw method.

How to replicate background-attachment fixed on iOS

It has been asked in the past, apparently it costs a lot to mobile browsers, so it's been disabled.

Check this comment by @PaulIrish:

Fixed-backgrounds have huge repaint cost and decimate scrolling performance, which is, I believe, why it was disabled.

you can see workarounds to this in this posts:

Fixed background image with ios7

Fixed body background scrolls with the page on iOS7

CSS Div Background Image Fixed Height 100% Width

But the thing is that the .chapter class is not dynamic you're declaring a height:1200px

so it's better to use background:cover and set with media queries specific height's for popular resolutions.

How to move text up using CSS when nothing is working

you can try

position: relative;
bottom: 20px;

but I don't see a problem on my browser (Google Chrome)

Display Image On Text Link Hover CSS Only


.hover_img a:hover span {
    display: block;
    width: 350px;

to show hover image full size in table change 350 to your size.

What's the best way to add a drop shadow to my UIView

On viewWillLayoutSubviews:

override func viewWillLayoutSubviews() {
    sampleView.layer.masksToBounds =  false
    sampleView.layer.shadowColor = UIColor.darkGrayColor().CGColor;
    sampleView.layer.shadowOffset = CGSizeMake(2.0, 2.0)
    sampleView.layer.shadowOpacity = 1.0

Using Extension of UIView:

extension UIView {

    func addDropShadowToView(targetView:UIView? ){
        targetView!.layer.masksToBounds =  false
        targetView!.layer.shadowColor = UIColor.darkGrayColor().CGColor;
        targetView!.layer.shadowOffset = CGSizeMake(2.0, 2.0)
        targetView!.layer.shadowOpacity = 1.0



Clicking a button within a form causes page refresh

I wonder why nobody proposed the possibly simplest solution:

don't use a <form>

A <whatever ng-form> does IMHO a better job and without an HTML form, there's nothing to be submitted by the browser itself. Which is exactly the right behavior when using angular.

How should I declare default values for instance variables in Python?

Using class members for default values of instance variables is not a good idea, and it's the first time I've seen this idea mentioned at all. It works in your example, but it may fail in a lot of cases. E.g., if the value is mutable, mutating it on an unmodified instance will alter the default:

>>> class c:
...     l = []
>>> x = c()
>>> y = c()
>>> x.l
>>> y.l
>>> x.l.append(10)
>>> y.l
>>> c.l

How to search a specific value in all tables (PostgreSQL)?

There is a way to achieve this without creating a function or using an external tool. By using Postgres' query_to_xml() function that can dynamically run a query inside another query, it's possible to search a text across many tables. This is based on my answer to retrieve the rowcount for all tables:

To search for the string foo across all tables in a schema, the following can be used:

with found_rows as (
  select format('%I.%I', table_schema, table_name) as table_name,
         query_to_xml(format('select to_jsonb(t) as table_row 
                              from %I.%I as t 
                              where t::text like ''%%foo%%'' ', table_schema, table_name), 
                      true, false, '') as table_rows
  from information_schema.tables 
  where table_schema = 'public'
select table_name, x.table_row
from found_rows f
  left join xmltable('//table/row' 
                     passing table_rows
                         table_row text path 'table_row') as x on true

Note that the use of xmltable requires Postgres 10 or newer. For older Postgres version, this can be also done using xpath().

with found_rows as (
  select format('%I.%I', table_schema, table_name) as table_name,
         query_to_xml(format('select to_jsonb(t) as table_row 
                              from %I.%I as t 
                              where t::text like ''%%foo%%'' ', table_schema, table_name), 
                      true, false, '') as table_rows
  from information_schema.tables 
  where table_schema = 'public'
select table_name, x.table_row
from found_rows f
   cross join unnest(xpath('/table/row/table_row/text()', table_rows)) as r(data)

The common table expression (WITH ...) is only used for convenience. It loops through all tables in the public schema. For each table the following query is run through the query_to_xml() function:

select to_jsonb(t)
from some_table t
where t::text like '%foo%';

The where clause is used to make sure the expensive generation of XML content is only done for rows that contain the search string. This might return something like this:

<table xmlns:xsi="">
  <table_row>{"id": 42, "some_column": "foobar"}</table_row>

The conversion of the complete row to jsonb is done, so that in the result one could see which value belongs to which column.

The above might return something like this:

table_name   |   table_row
-------------+----------------------------------------   |  {"id": 1, "some_column": "foobar"}   |  {"id": 42, "another_column": "barfoo"}

Online example for Postgres 10+

Online example for older Postgres versions

Regex match everything after question mark?


If you want to match all chars after "?" you can use a group to match any char, and you'd better use the "$" sign to indicate the end of line.

Top 5 time-consuming SQL queries in Oracle

There are a number of possible ways to do this, but have a google for tkprof

There's no GUI... it's entirely command line and possibly a touch intimidating for Oracle beginners; but it's very powerful.

This link looks like a good start:

shift a std_logic_vector of n bit to right or left

Personally, I think the concatenation is the better solution. The generic implementation would be

entity shifter is
    generic (
        REGSIZE  : integer := 8);
        clk      : in  str_logic;
        Data_in  : in  std_logic;
        Data_out : out std_logic(REGSIZE-1 downto 0);
end shifter ;

architecture bhv of shifter is
    signal shift_reg : std_logic_vector(REGSIZE-1 downto 0) := (others<='0');
    process (clk) begin
        if rising_edge(clk) then
            shift_reg <= shift_reg(REGSIZE-2 downto 0) & Data_in;
        end if;
    end process;
end bhv;
Data_out <= shift_reg;

Both will implement as shift registers. If you find yourself in need of more shift registers than you are willing to spend resources on (EG dividing 1000 numbers by 4) you might consider using a BRAM to store the values and a single shift register to contain "indices" that result in the correct shift of all the numbers.

Functional programming vs Object Oriented programming

  1. If you're in a heavily concurrent environment, then pure functional programming is useful. The lack of mutable state makes concurrency almost trivial. See Erlang.

  2. In a multiparadigm language, you may want to model some things functionally if the existence of mutable state is must an implementation detail, and thus FP is a good model for the problem domain. For example, see list comprehensions in Python or std.range in the D programming language. These are inspired by functional programming.

Simple JavaScript Checkbox Validation

If your checkbox has an ID of 'checkbox':

 if(document.getElementById('checkbox').checked == true){ // code here }


What is your single most favorite command-line trick using Bash?

Programmable Completion:

Nothing fancy. I always disable it when I'm using Knoppix because it gets in the way too often. Just some basic ones:

shopt -s progcomp

complete -A stopped -P '%'          bg
complete -A job     -P '%'          fg jobs disown wait
complete -A variable                readonly export
complete -A variable -A function    unset
complete -A setopt                  set
complete -A shopt                   shopt
complete -A helptopic               help
complete -A alias                   alias unalias
complete -A binding                 bind
complete -A command                 type which \
                                    killall pidof
complete -A builtin                 builtin
complete -A disabled                enable

R: Break for loop

Well, your code is not reproducible so we will never know for sure, but this is what help('break')says:

break breaks out of a for, while or repeat loop; control is transferred to the first statement outside the inner-most loop.

So yes, break only breaks the current loop. You can also see it in action with e.g.:

for (i in 1:10)
    for (j in 1:10)
        for (k in 1:10)
            cat(i," ",j," ",k,"\n")
            if (k ==5) break

Comparison of DES, Triple DES, AES, blowfish encryption for data

Although TripleDESCryptoServiceProvider is a safe and good method but it's too slow. If you want to refer to MSDN you will get that advise you to use AES rather TripleDES. Please check below link: you will see this attention in the remark section:

Note A newer symmetric encryption algorithm, Advanced Encryption Standard (AES), is available. Consider using the AesCryptoServiceProvider class instead of the TripleDESCryptoServiceProvider class. Use TripleDESCryptoServiceProvider only for compatibility with legacy applications and data.

Good luck

Reading local text file into a JavaScript array

Using Node.js

sync mode:

var fs = require("fs");
var text = fs.readFileSync("./mytext.txt");
var textByLine = text.split("\n")

async mode:

var fs = require("fs");
fs.readFile("./mytext.txt", function(text){
    var textByLine = text.split("\n")


As of at least Node 6, readFileSync returns a Buffer, so it must first be converted to a string in order for split to work:

var text = fs.readFileSync("./mytext.txt").toString('utf-8');


var text = fs.readFileSync("./mytext.txt", "utf-8");

What is the maximum length of a Push Notification alert text?

It should be 236 bytes. There is no restriction on the size of the alert text as far as I know, but only the total payload size. So considering if the payload is minimal and only contains the alert information, it should look like:


That takes up 20 characters (20 bytes), leaving 236 bytes to put inside the alert string. With ASCII that will be 236 characters, and could be lesser with UTF8 and UTF16.

In Unix, how do you remove everything in the current directory and below it?

This simplest safe & general solution is probably:

find -mindepth 1 -maxdepth 1 -print0 | xargs -0 rm -rf

Is recursion ever faster than looping?

Tail recursion is as fast as looping. Many functional languages have tail recursion implemented in them.

Quoting backslashes in Python string literals

What Harley said, except the last point - it's not actually necessary to change the '/'s into '\'s before calling open. Windows is quite happy to accept paths with forward slashes.

infile = open('c:/folder/subfolder/file.txt')

The only time you're likely to need the string normpathed is if you're passing to to another program via the shell (using os.system or the subprocess module).

How to check if running in Cygwin, Mac or Linux?

Bash sets the shell variable OSTYPE. From man bash:

Automatically set to a string that describes the operating system on which bash is executing.

This has a tiny advantage over uname in that it doesn't require launching a new process, so will be quicker to execute.

However, I'm unable to find an authoritative list of expected values. For me on Ubuntu 14.04 it is set to 'linux-gnu'. I've scraped the web for some other values. Hence:

case "$OSTYPE" in
  linux*)   echo "Linux / WSL" ;;
  darwin*)  echo "Mac OS" ;; 
  win*)     echo "Windows" ;;
  msys*)    echo "MSYS / MinGW / Git Bash" ;;
  cygwin*)  echo "Cygwin" ;;
  bsd*)     echo "BSD" ;;
  solaris*) echo "Solaris" ;;
  *)        echo "unknown: $OSTYPE" ;;

The asterisks are important in some instances - for example OSX appends an OS version number after the 'darwin'. The 'win' value is actually 'win32', I'm told - maybe there is a 'win64'?

Perhaps we could work together to populate a table of verified values here:

  • Linux Ubuntu (incl. WSL): linux-gnu
  • Cygwin 64-bit: cygwin
  • Msys/MINGW (Git Bash for Windows): msys

(Please append your value if it differs from existing entries)

How can I convert an HTML table to CSV?

With Perl you can use the HTML::TableExtract module to extract the data from the table and then use Text::CSV_XS to create a CSV file or Spreadsheet::WriteExcel to create an Excel file.

how to run python files in windows command prompt?

You have to install Python and add it to PATH on Windows. After that you can try:

python `C:/pathToFolder/`

or go to the files directory and execute:


SQL Query Multiple Columns Using Distinct on One Column Only

select * from tblFruit where
tblFruit_ID in (Select max(tblFruit_ID) FROM tblFruit group by tblFruit_FruitType)

How to properly exit a C# application?

This will work from anywhere, inside Form(), Form_Load(), or any event handler. I posted before, but I don't see it now?!?

public void exit(int exitCode)
    if (System.Windows.Forms.Application.MessageLoop)
       // Use this since we are in a running Form
       // Form ended or never .Run
} //* end exit()

String.equals() with multiple conditions (and one action on result)

Pattern p = Pattern.compile("tom"); //the regular-expression pattern
Matcher m = p.matcher("(bob)(tom)(harry)"); //The data to find matches with

while (m.find()) {
    //do something???

Use regex to find a match maybe?

Or create an array

 String[] a = new String[]{

     //do something

Create an ArrayList with multiple object types?

You can make it like :

List<Object> sections = new ArrayList <Object>();

(Recommended) Another possible solution would be to make a custom model class with two parameters one Integer and other String. Then using an ArrayList of that object.

How to detect string which contains only spaces?

The fastest solution would be using the regex prototype function test() and looking for any character that is not a space, tab, or line break \S :

if (!/\S/.test(str)) {
  // Didn't find something other than a space which means it's empty

In case you have a super long string, it can make a significant difference as it will stop processing as soon as it finds a non-space character.

How to add element into ArrayList in HashMap

Typical code is to create an explicit method to add to the list, and create the ArrayList on the fly when adding. Note the synchronization so the list only gets created once!

public synchronized boolean addToList(String key, Item item) {
   Collection<Item> list = theMap.get(key);
   if (list == null)  {
      list = new ArrayList<Item>();  // or, if you prefer, some other List, a Set, etc...
      theMap.put(key, list );

   return list.add(item);

Color Tint UIButton Image

If you want to manually mask your image, here is updated code that works with retina screens

- (UIImage *)maskWithColor:(UIColor *)color
    CGImageRef maskImage = self.CGImage;
    CGFloat width = self.size.width * self.scale;
    CGFloat height = self.size.height * self.scale;
    CGRect bounds = CGRectMake(0,0,width,height);

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef bitmapContext = CGBitmapContextCreate(NULL, width, height, 8, 0, colorSpace, kCGBitmapAlphaInfoMask & kCGImageAlphaPremultipliedLast);
    CGContextClipToMask(bitmapContext, bounds, maskImage);
    CGContextSetFillColorWithColor(bitmapContext, color.CGColor);
    CGContextFillRect(bitmapContext, bounds);

    CGImageRef cImage = CGBitmapContextCreateImage(bitmapContext);
    UIImage *coloredImage = [UIImage imageWithCGImage:cImage scale:self.scale orientation:self.imageOrientation];


    return coloredImage;

How to access the contents of a vector from a pointer to the vector in C++?

vector<int> v;
vector<int> * p = &v;
cout << (*p)[0] << endl;

add title attribute from css

While currently not possible with CSS, there is a proposal to enable this functionality called Cascading Attribute Sheets.

Filter Java Stream to 1 and only 1 element

Inspired by @skiwi, I solved it the following way:

public static <T> T toSingleton(Stream<T> stream) {
    List<T> list = stream.limit(1).collect(Collectors.toList());
    if (list.isEmpty()) {
        return null;
    } else {
        return list.get(0);

And then:

User user = toSingleton(;

How to disable all <input > inside a form with jQuery?

With this one line you can disable any input field in a form

$('form *').prop('disabled', true);

Redirecting unauthorized controller in ASP.NET MVC

You should build your own Authorize-filter attribute.

Here's mine to study ;)

Public Class RequiresRoleAttribute : Inherits ActionFilterAttribute
    Private _role As String

    Public Property Role() As String
            Return Me._role
        End Get
        Set(ByVal value As String)
            Me._role = value
        End Set
    End Property

    Public Overrides Sub OnActionExecuting(ByVal filterContext As System.Web.Mvc.ActionExecutingContext)
        If Not String.IsNullOrEmpty(Me.Role) Then
            If Not filterContext.HttpContext.User.Identity.IsAuthenticated Then
                Dim redirectOnSuccess As String = filterContext.HttpContext.Request.Url.AbsolutePath
                Dim redirectUrl As String = String.Format("?ReturnUrl={0}", redirectOnSuccess)
                Dim loginUrl As String = FormsAuthentication.LoginUrl + redirectUrl

                filterContext.HttpContext.Response.Redirect(loginUrl, True)
                Dim hasAccess As Boolean = filterContext.HttpContext.User.IsInRole(Me.Role)
                If Not hasAccess Then
                    Throw New UnauthorizedAccessException("You don't have access to this page. Only " & Me.Role & " can view this page.")
                End If
            End If
            Throw New InvalidOperationException("No Role Specified")
        End If

    End Sub
End Class

Composer require runs out of memory. PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted

For this error in macOS Catalina and macOS Big Sur use this line:

php -d memory_limit=-1 /usr/local/bin/composer update --no-plugins

I used this line to update on Symfony 5. This command also worked with laravel 7.

Error Code: 2013. Lost connection to MySQL server during query

There seems to be an answer missing here for those using SSH to connect to their MySQL database. You need to check two places not 1 as suggested by other answers:

Workbench Edit ? Preferences ? SQL Editor ? DBMS

Workbench Edit ? Preferences ? SSH ? Timeouts

My default SSH Timeouts were set very low and causing some (but apparently not all) of my timeout issues. After, don't forget to restart MySQL Workbench!

Last, it may be worth contacting your DB Admin and asking them to increase wait_timeout & interactive_timeout properties in mysql itself via my.conf + mysql restart or doing a global set if restarting mysql is not an option.

Hope this helps!

Calculate median in c#

Here's a generic version of Jason's answer

    /// <summary>
    /// Gets the median value from an array
    /// </summary>
    /// <typeparam name="T">The array type</typeparam>
    /// <param name="sourceArray">The source array</param>
    /// <param name="cloneArray">If it doesn't matter if the source array is sorted, you can pass false to improve performance</param>
    /// <returns></returns>
    public static T GetMedian<T>(T[] sourceArray, bool cloneArray = true) where T : IComparable<T>
        //Framework 2.0 version of this method. there is an easier way in F4        
        if (sourceArray == null || sourceArray.Length == 0)
            throw new ArgumentException("Median of empty array not defined.");

        //make sure the list is sorted, but use a new array
        T[] sortedArray = cloneArray ? (T[])sourceArray.Clone() : sourceArray;

        //get the median
        int size = sortedArray.Length;
        int mid = size / 2;
        if (size % 2 != 0)
            return sortedArray[mid];

        dynamic value1 = sortedArray[mid];
        dynamic value2 = sortedArray[mid - 1];
        return (sortedArray[mid] + value2) * 0.5;

How can I enable Assembly binding logging?

If you sometimes run different versions of your application, make sure you delete 'Bla' from the application bin directory if the version running doesn't need it.

PHP replacing special characters like à->a, è->e

As of PHP >= 5.4.0

$translatedString = transliterator_transliterate('Any-Latin; Latin-ASCII; [\u0080-\u7fff] remove', $string);

Convert JSON string to array of JSON objects in Javascript

As Luca indicated, add extra [] to your string and use the code below:

var myObject = eval('(' + myJSONtext + ')');

to test it you can use the snippet below.

var s =" [{'id':1,'name':'Test1'},{'id':2,'name':'Test2'}]";
var myObject = eval('(' + s + ')');
for (i in myObject)

hope it helps..

How can I get the count of milliseconds since midnight for the current?

You can use java.util.Calendar class to get time in milliseconds. Example:

Calendar cal = Calendar.getInstance();
int milliSec = cal.get(Calendar.MILLISECOND);
// print milliSec

java.util.Date date = cal.getTime();
System.out.println("Output: " +  new SimpleDateFormat("yyyy/MM/dd-HH:mm:ss:SSS").format(date));

What is the best way to implement constants in Java?

One of the way I do it is by creating a 'Global' class with the constant values and do a static import in the classes that need access to the constant.

How to find the 'sizeof' (a pointer pointing to an array)?

No, you can't use sizeof(ptr) to find the size of array ptr is pointing to.

Though allocating extra memory(more than the size of array) will be helpful if you want to store the length in extra space.

How to check for an empty object in an AngularJS view

Create a $scope function that check it and returns true or false, like a "isEmpty" function and use in your view on ng-if statement like


Foreign key constraints: When to use ON UPDATE and ON DELETE

Do not hesitate to put constraints on the database. You'll be sure to have a consistent database, and that's one of the good reasons to use a database. Especially if you have several applications requesting it (or just one application but with a direct mode and a batch mode using different sources).

With MySQL you do not have advanced constraints like you would have in postgreSQL but at least the foreign key constraints are quite advanced.

We'll take an example, a company table with a user table containing people from theses company

     company_id INT NOT NULL,
     company_name VARCHAR(50),
     PRIMARY KEY (company_id)

     user_id INT, 
     user_name VARCHAR(50), 
     company_id INT,
     INDEX company_id_idx (company_id),
     FOREIGN KEY (company_id) REFERENCES COMPANY (company_id) ON...

Let's look at the ON UPDATE clause:

  • ON UPDATE RESTRICT : the default : if you try to update a company_id in table COMPANY the engine will reject the operation if one USER at least links on this company.
  • ON UPDATE CASCADE : the best one usually : if you update a company_id in a row of table COMPANY the engine will update it accordingly on all USER rows referencing this COMPANY (but no triggers activated on USER table, warning). The engine will track the changes for you, it's good.
  • ON UPDATE SET NULL : if you update a company_id in a row of table COMPANY the engine will set related USERs company_id to NULL (should be available in USER company_id field). I cannot see any interesting thing to do with that on an update, but I may be wrong.

And now on the ON DELETE side:

  • ON DELETE RESTRICT : the default : if you try to delete a company_id Id in table COMPANY the engine will reject the operation if one USER at least links on this company, can save your life.
  • ON DELETE CASCADE : dangerous : if you delete a company row in table COMPANY the engine will delete as well the related USERs. This is dangerous but can be used to make automatic cleanups on secondary tables (so it can be something you want, but quite certainly not for a COMPANY<->USER example)
  • ON DELETE SET NULL : handful : if you delete a COMPANY row the related USERs will automatically have the relationship to NULL. If Null is your value for users with no company this can be a good behavior, for example maybe you need to keep the users in your application, as authors of some content, but removing the company is not a problem for you.

usually my default is: ON DELETE RESTRICT ON UPDATE CASCADE. with some ON DELETE CASCADE for track tables (logs--not all logs--, things like that) and ON DELETE SET NULL when the master table is a 'simple attribute' for the table containing the foreign key, like a JOB table for the USER table.


It's been a long time since I wrote that. Now I think I should add one important warning. MySQL has one big documented limitation with cascades. Cascades are not firing triggers. So if you were over confident enough in that engine to use triggers you should avoid cascades constraints.

MySQL triggers activate only for changes made to tables by SQL statements. They do not activate for changes in views, nor by changes to tables made by APIs that do not transmit SQL statements to the MySQL Server

==> See below the last edit, things are moving on this domain

Triggers are not activated by foreign key actions.

And I do not think this will get fixed one day. Foreign key constraints are managed by the InnoDb storage and Triggers are managed by the MySQL SQL engine. Both are separated. Innodb is the only storage with constraint management, maybe they'll add triggers directly in the storage engine one day, maybe not.

But I have my own opinion on which element you should choose between the poor trigger implementation and the very useful foreign keys constraints support. And once you'll get used to database consistency you'll love PostgreSQL.

12/2017-Updating this Edit about MySQL:

as stated by @IstiaqueAhmed in the comments, the situation has changed on this subject. So follow the link and check the real up-to-date situation (which may change again in the future).

Open Source HTML to PDF Renderer with Full CSS Support

It's not open source, but you can at least get a free personal use license to Prince, which really does a lovely job.

Pointer to incomplete class type is not allowed

Check out if you are missing some import.

How to store a large (10 digits) integer?

A primitive long or its java.lang.Long wrapper can also store ten digits.

Converting Milliseconds to Minutes and Seconds?

Here is the full program

import java.util.concurrent.TimeUnit;

public class Milliseconds {

public static void main(String[] args) {
    long milliseconds = 1000000;

    // long minutes = (milliseconds / 1000) / 60;
    long minutes = TimeUnit.MILLISECONDS.toMinutes(milliseconds);

    // long seconds = (milliseconds / 1000);
    long seconds = TimeUnit.MILLISECONDS.toSeconds(milliseconds);

    System.out.format("%d Milliseconds = %d minutes\n", milliseconds, minutes );
    System.out.format("%d Milliseconds = %d seconds", milliseconds, seconds );


I found this program here "Link" there it is explained in detail.

How does one use the onerror attribute of an img element

This works:

<img src="invalid_link"

Live demo:

As Nikola pointed out in the comment below, in case the backup URL is invalid as well, some browsers will trigger the "error" event again which will result in an infinite loop. We can guard against this by simply nullifying the "error" handler via this.onerror=null;.

Mosaic Grid gallery with dynamic sized images

I suggest Freewall. It is a cross-browser and responsive jQuery plugin to help you create many types of grid layouts: flexible layouts, images layouts, nested grid layouts, metro style layouts, pinterest like layouts ... with nice CSS3 animation effects and call back events. Freewall is all-in-one solution for creating dynamic grid layouts for desktop, mobile, and tablet.

Home page and document: also found here.

How to use SVG markers in Google Maps API v3

You can render your icon using the SVG Path notation.

See Google documentation for more information.

Here is a basic example:

var icon = {

    path: "M-20,0a20,20 0 1,0 40,0a20,20 0 1,0 -40,0",
    fillColor: '#FF0000',
    fillOpacity: .6,
    anchor: new google.maps.Point(0,0),
    strokeWeight: 0,
    scale: 1

var marker = new google.maps.Marker({
    position: event.latLng,
    map: map,
    draggable: false,
    icon: icon

Here is a working example on how to display and scale a marker SVG icon:

JSFiddle demo


Another example here with a complex icon:

JSFiddle demo

Edit 2:

And here is how you can have a SVG file as an icon:

JSFiddle demo

pull out p-values and r-squared from a linear regression

Another option is to use the cor.test function, instead of lm:

> x <- c(44.4, 45.9, 41.9, 53.3, 44.7, 44.1, 50.7, 45.2, 60.1)
> y <- c( 2.6,  3.1,  2.5,  5.0,  3.6,  4.0,  5.2,  2.8,  3.8)

> mycor = cor.test(x,y)
> mylm = lm(x~y)

# r and rsquared:
> cor.test(x,y)$estimate ** 2
> summary(lm(x~y))$r.squared
[1] 0.3262484

# P.value 

> lmp(lm(x~y))  # Using the lmp function defined in Chase's answer
[1] 0.1081731
> cor.test(x,y)$p.value
[1] 0.1081731

Adding link a href to an element using css

You don't need CSS for this.

     <img src="abc"/>

now with link:

     <a href="#myLink"><img src="abc"/></a>

Or with jquery, later on, you can use the wrap property, see these questions answer:

how to add a link to an image using jquery?

View's SELECT contains a subquery in the FROM clause

create view view_clients_credit_usage as
    select client_id, sum(credits_used) as credits_used 
    from credit_usage 
    group by client_id

create view view_credit_status as 
        sum(credit_orders.number_of_credits) as purchased, 
        ifnull(t1.credits_used,0) as used 
    from credit_orders
    left outer join view_clients_credit_usage as t1 on t1.client_id = credit_orders.client_id
    where credit_orders.payment_status='Paid'
    group by credit_orders.client_id)

Difference between Groovy Binary and Source release?

A source release will be compiled on your own machine while a binary release must match your operating system.

source releases are more common on linux systems because linux systems can dramatically vary in cpu, installed library versions, kernelversions and nearly every linux system has a compiler installed.

binary releases are common on ms-windows systems. most windows machines do not have a compiler installed.

How to do a simple file search in cmd

dir /s *foo* searches in current folder and sub folders.

It finds directories as well as files.

where /s means(documentation):

/s Lists every occurrence of the specified file name within the specified directory and all subdirectories.

How to disable scrolling the document body?

If you want to use the iframe's scrollbar and not the parent's use this: = 'hidden';

If you want to use the parent's scrollbar and not the iframe's then you need to use:

document.getElementById('your_iframes_id').scrolling = 'no';

or set the scrolling="no" attribute in your iframe's tag: <iframe src="some_url" scrolling="no">.

Set background colour of cell to RGB value of data in cell

Sub AddColor()
    For Each cell In Selection
        R = Round(cell.Value)
        G = Round(cell.Offset(0, 1).Value)
        B = Round(cell.Offset(0, 2).Value)
        Cells(cell.Row, 1).Resize(1, 4).Interior.Color = RGB(R, G, B)
    Next cell
End Sub

Assuming that there are 3 columns R, G and B (in this order). Select first column ie R. press alt+F11 and run the above code. We have to select the first column (containing R or red values) and run the code every time we change the values to reflect the changes.

I hope this simpler code helps !

How do I find the authoritative name-server for a domain name?

I found that the best way it to add always the +trace option:

dig SOA +trace

It works also with recursive CNAME hosted in different provider. +trace trace imply +norecurse so the result is just for the domain you specify.

Updating user data - ASP.NET Identity

I also had problems using UpdateAsync when developing a version of SimpleSecurity that uses ASP.NET Identity. For example, I added a feature to do a password reset that needed to add a password reset token to the user information. At first I tried using UpdateAsync and it got the same results as you did. I ended up wrapping the user entity in a repository pattern and got it to work. You can look at the SimpleSecurity project for an example. After working with ASP.NET Identity more (documentation is still non-existent) I think that UpdateAsync just commits the update to the context, you still need to save the context for it to commit to the database.

How to remove unwanted space between rows and columns in table?

  border: 1px solid black;_x000D_
table td {_x000D_
  border: 1px solid black; /* Style just to show the table cell boundaries */_x000D_
_x000D_ {_x000D_
  border-spacing:0; /* Removes the cell spacing via CSS */_x000D_
  border-collapse: collapse;  /* Optional - if you don't want to have double border where cells touch */_x000D_
<p>Default table:</p>_x000D_
    <td>First cell</td>_x000D_
    <td>Second cell</td>_x000D_
<p>Removed spacing:</p>_x000D_
<table class="no-spacing" cellspacing="0"> <!-- cellspacing 0 to support IE6 and IE7 -->_x000D_
    <td>First cell</td>_x000D_
    <td>Second cell</td>_x000D_

difference between throw and throw new Exception()

Most important difference is that second expression erases type of exception. And exception type plays vital role in catching exceptions:

public void MyMethod ()
    // both can throw IOException
    try { foo(); } catch { throw; }
    try { bar(); } catch(E) {throw new Exception(E.message); }


try {
    MyMethod ();
} catch (IOException ex) {
    Console.WriteLine ("Error with I/O"); // [1]
} catch (Exception ex) {
    Console.WriteLine ("Other error");    // [2]

If foo() throws IOException, [1] catch block will catch exception. But when bar() throws IOException, it will be converted to plain Exception ant won't be caught by [1] catch block.

Docker: adding a file from a parent directory

Unfortunately, (for practical and security reasons I guess), if you want to add/copy local content, it must be located under the same root path than the Dockerfile.

From the documentation:

The <src> path must be inside the context of the build; you cannot ADD ../something/something, because the first step of a docker build is to send the context directory (and subdirectories) to the docker daemon.

EDIT: There's now an option (-f) to set the path of your Dockerfile ; it can be used to achieve what you want, see @Boedy 's response.

How to add new line in Markdown presentation?

If none of the solutions mentions here work for you, which is what happened with me, then you can do the following: Add an empty header (A hack that ruins semantics)


Just make sure that when the header is added it has no border in bottom of it in the markdown css, so you can try different variations of the headers.

Adding a user on .htpasswd

Exact same thing, just omit the -c option. Apache's docs on it here.

htpasswd /etc/apache2/.htpasswd newuser

Also, htpasswd typically isn't run as root. It's typically owned by either the web server, or the owner of the files being served. If you're using root to edit it instead of logging in as one of those users, that's acceptable (I suppose), but you'll want to be careful to make sure you don't accidentally create a file as root (and thus have root own it and no one else be able to edit it).

How can I break up this long line in Python?

Consecutive string literals are joined by the compiler, and parenthesized expressions are considered to be a single line of code:"Skipping {0} because it's thumbnail was "
  "already in our system as {1}.".format(line[indexes['url']],

Unknown URL content://downloads/my_downloads

The exception is caused by disabled Download Manager. And there is no way to activate/deactivate Download Manager directly, since it's system application and we don't have access to it.

Only alternative way is redirect user to settings of Download Manager Application.

try {
     //Open the specific App Info page:
     Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
     intent.setData(Uri.parse("package:" + ""));

} catch ( ActivityNotFoundException e ) {

     //Open the generic Apps page:
     Intent intent = new Intent(android.provider.Settings.ACTION_MANAGE_APPLICATIONS_SETTINGS);

Move existing, uncommitted work to a new branch in Git

The common scenario is the following: I forgot to create the new branch for the new feature, and was doing all the work in the old feature branch. I have commited all the "old" work to the master branch, and I want my new branch to grow from the "master". I have not made a single commit of my new work. Here is the branch structure: "master"->"Old_feature"

git stash 
git checkout master
git checkout -b "New_branch"
git stash apply

How to reset postgres' primary key sequence when it falls out of sync?

Putting it all together

CREATE OR REPLACE FUNCTION "reset_sequence" (tablename text) 
RETURNS "pg_catalog"."void" AS
  EXECUTE 'SELECT setval( pg_get_serial_sequence(''' || tablename || ''', ''id''),
  (SELECT COALESCE(MAX(id)+1,1) FROM ' || tablename || '), false)';
$body$  LANGUAGE 'plpgsql';

will fix 'id' sequence of the given table (as usually necessary with django for instance).

How do I hide anchor text without hiding the anchor?

Another option is to hide based on bootstraps "sr-only" class. If you wrap the text in a span with the class "sr-only" then the text will not be displayed, but screen readers will still have access to it. So you would have:

<li><a href="somehwere"><span class="sr-only">Link text</span></a></li>

If you are not using bootstrap, still keep the above, but also add the below css to define the "sr-only" class:

.sr-only {position: absolute;  width: 1px;  height: 1px;  padding: 0;  margin: -1px;  overflow: hidden;  clip: rect(0 0 0 0);  border: 0; }

The best node module for XML parsing

You can try xml2js. It's a simple XML to JavaScript object converter. It gets your XML converted to a JS object so that you can access its content with ease.

Here are some other options:

  1. libxmljs
  2. xml-stream
  3. xmldoc
  4. cheerio – implements a subset of core jQuery for XML (and HTML)

I have used xml2js and it has worked fine for me. The rest you might have to try out for yourself.

Cannot use object of type stdClass as array?

Have same problem today, solved like this:

If you call json_decode($somestring) you will get an Object and you need to access like $object->key , but if u call json_decode($somestring, true) you will get an dictionary and can access like $array['key']

How to install the JDK on Ubuntu Linux

Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?,

How to install Open JDK (Java developement kit) in Ubuntu (Linux)?

  1. Open Terminal from Application Dash or press Ctrl+Alt+T

  2. Update repository:

    sudo add-apt-repository ppa:openjdk-r/ppa  # only Ubuntu 17.4 and earlier
    sudo apt update
  3. Optional: To search available distributions of openjdk, use the following command:

    apt search openjdk
  4. Install the appropriate version with the following command:

    sudo apt install openjdk-8-jdk
    sudo apt install openjdk-8-source #this is optional, the jdk source code
  5. For JAVA_HOME (Environment Variable) type command as shown below, in "Terminal" using your installation path...

    export JAVA_HOME=/usr/lib/jvm/java-8-openjdk

    (Note: /usr/lib/jvm/java-8-openjdk is symbolically used here just for demostration. You should use your path as per your installation.)

  6. For PATH (Environment Variable) type command as shown below, in Terminal:

    export PATH=$PATH:$JAVA_HOME/bin

  7. To check your installation:

    java -version

Why am I getting a "401 Unauthorized" error in Maven?

Failed to transfer file:
Return code is: 401, ReasonPhrase: Unauthorized. -> [Help 1]


In this case you need to change the version in the pom file, and try to use a new version.

Here 01.16.03 already exist so it was failing and when i have tried with the 01.16.04 version the job went successful.

What is polymorphism, what is it for, and how is it used?

Polymorphism allows the same routine (function, method) to act on different types.

Since many existing answers are conflating subtyping with polymorphism, here are three ways (including subtyping) to implement polymorphism.

  • Parameteric (generic) polymorphism allows a routine to accept one or more type parameters, in addition to normal parameters, and runs itself on those types.
  • Subtype polymorphism allows a routine to act on any subtype of its parameters.
  • Ad hoc polymorphism generally uses routine overloading to grant polymorphic behavior, but can refer to other polymorphism implementations too.

See also:

Run ScrollTop with offset of element by ID

var top = ($(".apps_intro_wrapper_inner").offset() || { "top": NaN }).top;   
if (!isNaN(top)) {
$("#app_scroler").click(function () {   
$('html, body').animate({
            scrollTop: top
        }, 100);

if you want to scroll a little above or below from specific div that add value to the top like I add 800

var top = ($(".apps_intro_wrapper_inner").offset() || { "top": NaN }).top + 800;

convert datetime to date format dd/mm/yyyy

DateTime.ToString("dd/MM/yyyy") may give the date in dd-MM-yyyy format. This depends on your short date format. If short date format is not as per format, we have to replace character '-' with '/' as below:

 date = DateTime.Now.ToString("dd/MM/yyyy").Replace('-','/');

how to parse JSONArray in android

Here is a better way for doing it. Hope this helps

protected void onPostExecute(String result) {
                Log.v(TAG + " result);

                if (!result.equals("")) {

                    // Set up variables for API Call
                    ArrayList<String> list = new ArrayList<String>();

                    try {
                        JSONArray jsonArray = new JSONArray(result);

                        for (int i = 0; i < jsonArray.length(); i++) {


                        }//end for
                    } catch (JSONException e) {
                        Log.e(TAG, "onPostExecute > Try > JSONException => " + e);

                    adapter = new ArrayAdapter<String>(ListViewData.this, android.R.layout.simple_list_item_1,, list);
                    listView.setOnItemClickListener(new OnItemClickListener() {
                        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                            // ListView Clicked item index
                            int itemPosition = position;

                            // ListView Clicked item value
                            String itemValue = (String) listView.getItemAtPosition(position);

                            // Show Alert
                            Toast.makeText( ListViewData.this, "Position :" + itemPosition + "  ListItem : " + itemValue, Toast.LENGTH_LONG).show();


How to use 'cp' command to exclude a specific directory?

Another simpler option is to install and use rsync which has an --exclude-dir option, and can be used for both local and remote files.

CSS: transition opacity on mouse-out?

You're applying transitions only to the :hover pseudo-class, and not to the element itself.

.item {   
  -webkit-transition: opacity 1s ease-in-out;
  -moz-transition: opacity 1s ease-in-out;
  -ms-transition: opacity 1s ease-in-out;
  -o-transition: opacity 1s ease-in-out;
  transition: opacity 1s ease-in-out;

.item:hover {
  zoom: 1;
  filter: alpha(opacity=50);
  opacity: 0.5;


If you don't want the transition to affect the mouse-over event, but only mouse-out, you can turn transitions off for the :hover state :

.item:hover {
  -webkit-transition: none;
  -moz-transition: none;
  -ms-transition: none;
  -o-transition: none;
  transition: none;
  zoom: 1;
  filter: alpha(opacity=50);
  opacity: 0.5;


Attempt to write a readonly database - Django w/ SELinux error

This issue is caused by SELinux. After setting file ownership just as you did, I hit this issue. The audit2why(1) tool can be used to diagnose SELinux denials from the log:

(django)[f22-4:www/django/demo] ftweedal% sudo audit2why -a
type=AVC msg=audit(1437490152.208:407): avc:  denied  { write }
      for  pid=20330 comm="httpd" name="db.sqlite3" dev="dm-1" ino=52036
      tclass=file permissive=0
    Was caused by:
    The boolean httpd_unified was set incorrectly. 
    Allow httpd to unified

    Allow access by executing:
    # setsebool -P httpd_unified 1

Sure enough, running sudo setsebool -P httpd_unified 1 resolved the issue.

Looking into what httpd_unified is for, I came across a fedora-selinux-list post which explains:

This Boolean is off by default, turning it on will allow all httpd executables to have full access to all content labeled with a http file context. Leaving it off makes sure that one httpd service can not interfere with another.

So turning on httpd_unified lets you circumvent the default behaviour that prevents multiple httpd instances on the same server - all running as user apache - messing with each others' stuff.

In my case, I am only running one httpd, so it was fine for me to turn on httpd_unified. If you cannot do this, I suppose some more fine-grained labelling is needed.

Get parent directory of running script

Try this. Works on both windows or linux server..


Programmatically select a row in JTable

You use the available API of JTable and do not try to mess with the colors.

Some selection methods are available directly on the JTable (like the setRowSelectionInterval). If you want to have access to all selection-related logic, the selection model is the place to start looking

Getting the filenames of all files in a folder

You could do it like that:

File folder = new File("your/path");
File[] listOfFiles = folder.listFiles();

for (int i = 0; i < listOfFiles.length; i++) {
  if (listOfFiles[i].isFile()) {
    System.out.println("File " + listOfFiles[i].getName());
  } else if (listOfFiles[i].isDirectory()) {
    System.out.println("Directory " + listOfFiles[i].getName());

Do you want to only get JPEG files or all files?

What's the simplest way of detecting keyboard input in a script from the terminal?

You can use methods from if you are on Windows.

import msvcrt
while True:
    print "Doing a function"
    if msvcrt.kbhit():
        print "Key pressed: %s" % msvcrt.getch()

Converting ISO 8601-compliant String to java.util.Date

Use string like LocalDate.parse(((String) data.get("d_iso8601")),DateTimeFormatter.ISO_DATE)

django templates: include and extends

Added for reference to future people who find this via google: You might want to look at the {% overextend %} tag provided by the mezzanine library for cases like this.

Count cells that contain any text

COUNTIF function can count cell which specific condition where as COUNTA will count all cell which contain any value

Example: Function in A7: =COUNTA(A1:A6)


A1| a

A2| b

A3| banana

A4| 42



A7| 4 (result)

Reset Windows Activation/Remove license key

  1. Open a command prompt as an Administrator.

  2. Enter slmgr /upk and wait for this to complete. This will uninstall the current product key from Windows and put it into an unlicensed state.

  3. Enter slmgr /cpky and wait for this to complete. This will remove the product key from the registry if it's still there.

  4. Enter slmgr /rearm and wait for this to complete. This is to reset the Windows activation timers so the new users will be prompted to activate Windows when they put in the key.

This should put the system back to a pre-key state.

Hope this helps you out!

How to get number of video views with YouTube API?

I think, the easiest way, is to get video info in JSON format. If you want to use JavaScript, try jQuery.getJSON()... But I prefer PHP:

$video_ID = 'your-video-ID';
$JSON = file_get_contents("{$video_ID}?v=2&alt=json");
$JSON_Data = json_decode($JSON);
$views = $JSON_Data->{'entry'}->{'yt$statistics'}->{'viewCount'};
echo $views;

Ref: Youtube API - Retrieving information about a single video

Add Bootstrap Glyphicon to Input Box

You can use its Unicode HTML

So to add a user icon, just add &#xe008; to the placeholder attribute, or wherever you want it.

You may want to check this cheat sheet.


<link rel="stylesheet" href="">_x000D_
<input type="text" class="form-control" placeholder="&#xe008; placeholder..." style="font-family: 'Glyphicons Halflings', Arial">_x000D_
<input type="text" class="form-control" value="&#xe008; value..." style="font-family: 'Glyphicons Halflings', Arial">_x000D_
<input type="submit" class="btn btn-primary" value="&#xe008; submit-button" style="font-family: 'Glyphicons Halflings', Arial">

Don't forget to set the input's font to the Glyphicon one, using the following code: font-family: 'Glyphicons Halflings', Arial, where Arial is the font of the regular text in the input.

Why does range(start, end) not include end?

Although there are some useful algorithmic explanations here, I think it may help to add some simple 'real life' reasoning as to why it works this way, which I have found useful when introducing the subject to young newcomers:

With something like 'range(1,10)' confusion can arise from thinking that pair of parameters represents the "start and end".

It is actually start and "stop".

Now, if it were the "end" value then, yes, you might expect that number would be included as the final entry in the sequence. But it is not the "end".

Others mistakenly call that parameter "count" because if you only ever use 'range(n)' then it does, of course, iterate 'n' times. This logic breaks down when you add the start parameter.

So the key point is to remember its name: "stop". That means it is the point at which, when reached, iteration will stop immediately. Not after that point.

So, while "start" does indeed represent the first value to be included, on reaching the "stop" value it 'breaks' rather than continuing to process 'that one as well' before stopping.

One analogy that I have used in explaining this to kids is that, ironically, it is better behaved than kids! It doesn't stop after it supposed to - it stops immediately without finishing what it was doing. (They get this ;) )

Another analogy - when you drive a car you don't pass a stop/yield/'give way' sign and end up with it sitting somewhere next to, or behind, your car. Technically you still haven't reached it when you do stop. It is not included in the 'things you passed on your journey'.

I hope some of that helps in explaining to Pythonitos/Pythonitas!

PowerShell: Format-Table without headers

Here is how I solve this. I just pipe the output to Out-String and then pass that output to the .NET Trim function:

(gci | ft -HideTableHeaders | Out-String).Trim()

This will strip out the line breaks before and after the table.

You can also use TrimStart to just take care of the header's line break if you still want the trailing line breaks.

(gci | ft -HideTableHeaders | Out-String).TrimStart()

Is it possible to reference one CSS rule within another?

I had this problem yesterday. @Quentin's answer is ok:

No, you cannot reference one rule-set from another.

but I made a javascript function to simulate inheritance in css (like .Net):

    var inherit_array;_x000D_
    var inherit;_x000D_
    inherit_array = [];_x000D_
    Array.from(document.styleSheets).forEach(function (styleSheet_i, index) {_x000D_
        Array.from(styleSheet_i.cssRules).forEach(function (cssRule_i, index) {_x000D_
            if ( != null) {_x000D_
                inherit ="--inherits").trim();_x000D_
            } else {_x000D_
                inherit = "";_x000D_
            if (inherit != "") {_x000D_
                inherit_array.push({ selector: cssRule_i.selectorText, inherit: inherit });_x000D_
    Array.from(document.styleSheets).forEach(function (styleSheet_i, index) {_x000D_
        Array.from(styleSheet_i.cssRules).forEach(function (cssRule_i, index) {_x000D_
            if (cssRule_i.selectorText != null) {_x000D_
                inherit_array.forEach(function (inherit_i, index) {_x000D_
                    if (cssRule_i.selectorText.split(", ").includesMember(inherit_i.inherit.split(", ")) == true) {_x000D_
                        cssRule_i.selectorText = cssRule_i.selectorText + ", " + inherit_i.selector;_x000D_

Array.prototype.includesMember = function (arr2) {_x000D_
    var arr1;_x000D_
    var includes;_x000D_
    arr1 = this;_x000D_
    includes = false;_x000D_
    arr1.forEach(function (arr1_i, index) {_x000D_
        if (arr2.includes(arr1_i) == true) {_x000D_
            includes = true;_x000D_
    return includes;_x000D_

and equivalent css:

.test {_x000D_
    background-color: yellow;_x000D_
.productBox, .imageBox {_x000D_
    --inherits: .test;_x000D_
    display: inline-block;_x000D_

and equivalent HTML :

<div class="imageBox"></div>

I tested it and worked for me, even if rules are in different css files.

Update: I found a bug in hierarchichal inheritance in this solution, and am solving the bug very soon .

Output (echo/print) everything from a PHP Array

You can use print_r to get human-readable output.


Remove unused imports in Android Studio

On Mac use control + option + O

Using Server.MapPath() inside a static field in ASP.NET MVC

I think you can try this for calling in from a class


*----------------Sorry I oversight, for static function already answered the question by adrift*



I got exception while using System.Web.Hosting.HostingEnvironment.MapPath("~/SignatureImages/");

Ex details : System.ArgumentException: The relative virtual path 'SignatureImages' is not allowed here. at System.Web.VirtualPath.FailIfRelativePath()

Solution (tested in static webmethod)

System.Web.HttpContext.Current.Server.MapPath("~/SignatureImages/"); Worked

Get current time as formatted string in Go?

All the other response are very miss-leading for somebody coming from google and looking for "timestamp in go"! YYYYMMDDhhmmss is not a "timestamp".

To get the "timestamp" of a date in go (number of seconds from january 1970), the correct function is .Unix(), and it really return an integer

Java Look and Feel (L&F)

You can try L&F which i am developing - WebLaF
It combines three parts required for successful UI development:

  • Cross-platform re-stylable L&F for Swing applications
  • Large set of extended Swing components
  • Various utilities and managers

Licenses: GPLv3 and Commercial

A few examples showing how some of WebLaF components look like: Some of WebLaF components

Main reason why i have started with a totally new L&F is that most of existing L&F lack flexibility - you cannot re-style them in most cases (you can only change a few colors and turn on/off some UI elements in best case) and/or there are only inconvenient ways to do that. Its even worse when it comes to custom/3rd party components styling - they doesn't look similar to other components styled by some specific L&F or even totally different - that makes your application look unprofessional and unpleasant.

My goal is to provide a fully customizable L&F with a pack of additional widely-known and useful components (for example: date chooser, tree table, dockable and document panes and lots of other) and additional helpful managers and utilities, which will reduce the amount of code required to quickly integrate WebLaF into your application and help creating awesome UIs using Swing.

java doesn't run if structure inside of onclick listener

both your conditions are the same:

if(s < f) {     calc = f - s;     n = s; }else if(f > s){     calc =  s - f;     n = f;  } 


if(s < f)   


}else if(f > s){ 

are the same

change to

}else if(f < s){ 

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

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

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

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

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

How to create friendly URL in php?

I recently used the following in an application that is working well for my needs.


<IfModule mod_rewrite.c>
# enable rewrite engine
RewriteEngine On

# if requested url does not exist pass it as path info to index.php
RewriteRule ^$ index.php?/ [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule (.*) index.php?/$1 [QSA,L]


foreach (explode ("/", $_SERVER['REQUEST_URI']) as $part)
    // Figure out what you want to do with the URL parts.

How to display special characters in PHP

The following worked for me when having a similar issue lately:

$str = iconv('iso-8859-15', 'utf-8', $str);

"Are you missing an assembly reference?" compile error - Visual Studio

While creating new Blank UWP project in Visual Studio 2017 Community, this error came up.

enter image description here

After the suggested remedy (restoring NuGet cache) the reference resurfaced in the Project.

How does Django's Meta class work?

Class Meta is the place in your code logic where your model.fields MEET With your form.widgets. So under Class Meta() you create the link between your model' fields and the different widgets you want to have in your form.

PHP Parse error: syntax error, unexpected '?' in helpers.php 233

I had the same error and the problem is that I had not correctly installed Composer.

I am using Windows and I installed Composer-Setup.exe from and when you have more than one version of PHP installed you must select the version that you are running at this point of the installation

enter image description here

Grab a segment of an array in Java without creating a new array on heap

@unique72 answer as a simple function or line, you may need to replace Object, with the respective class type you wish to 'slice'. Two variants are given to suit various needs.

/// Extract out array from starting position onwards
public static Object[] sliceArray( Object[] inArr, int startPos ) {
    return Arrays.asList(inArr).subList(startPos, inArr.length).toArray();

/// Extract out array from starting position to ending position
public static Object[] sliceArray( Object[] inArr, int startPos, int endPos ) {
    return Arrays.asList(inArr).subList(startPos, endPos).toArray();

How to execute logic on Optional if not present?

For Java 8 Spring offers ifPresentOrElse from "Utility methods to work with Optionals" to achieve what you want. Example would be:

import static;    

ifPresentOrElse(dao.find(), obj -> obj.setAvailable(true), () -> logger.fatal("Object not available"));

Oracle - Best SELECT statement for getting the difference in minutes between two DateTime columns?

By default, oracle date subtraction returns a result in # of days.

So just multiply by 24 to get # of hours, and again by 60 for # of minutes.


  round((second_date - first_date) * (60 * 24),2) as time_in_minutes
    to_date('01/01/2008 01:30:00 PM','mm/dd/yyyy hh:mi:ss am') as first_date
   ,to_date('01/06/2008 01:35:00 PM','mm/dd/yyyy HH:MI:SS AM') as second_date
  ) test_data

What algorithms compute directions from point A to point B on a map?

An all-pairs shortest path algorithm will compute the shortest paths between all vertices in a graph. This will allow paths to be pre-computed instead of requiring a path to be calculated each time someone wants to find the shortest path between a source and a destination. The Floyd-Warshall algorithm is an all-pairs shortest path algorithm.

SQL Server: SELECT only the rows with MAX(DATE)

This works for me. use MAX(CONVERT(date, ReportDate)) to make sure you have date value

select max( CONVERT(date, ReportDate)) FROM [TraxHistory]

how to get 2 digits after decimal point in tsql?

SELECT CAST(12.0910239123 AS DECIMAL(15, 2))

How do I get current date/time on the Windows command line in a suitable format for usage in a file/folder name?

"d:\Program Files\7-Zip\7z.exe" a -r code_%date:~10,4%-%date:~4,2%-%date:~7,

Best way to implement multi-language/globalization in large .NET project

+1 Database

Forms in your app can even re-translate themselves on the fly if corrections are made to the database.

We used a system where all the controls were mapped in an XML file (one per form) to language resource IDs, but all the IDs were in the database.

Basically, instead of having each control hold the ID (implementing an interface, or using the tag property in VB6), we used the fact that in .NET, the control tree was easily discoverable through reflection. A process when the form loaded would build the XML file if it was missing. The XML file would map the controls to their resource IDs, so this simply needed to be filled in and mapped to the database. This meant that there was no need to change the compiled binary if something was not tagged, or if it needed to be split to another ID (some words in English which might be used as both nouns and verbs might need to translate to two different words in the dictionary and not be re-used, but you might not discover this during initial assignment of IDs). But the fact is that the whole translation process becomes completely independent of your binary (every form has to inherit from a base form which knows how to translate itself and all its controls).

The only ones where the app gets more involved is when a phase with insertion points is used.

The database translation software was your basic CRUD maintenance screen with various workflow options to facilitate going through the missing translations, etc.

Codeigniter - no input file specified

Just add the ? sign after index.php in the .htaccess file :

RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]

and it would work !


Everyone is correct here but writing same query twice is not a good way of programming ... so I have another way to do the full join in mysql which is as follows

 user_id , user_name, user_department 
     user_id  , user_name , NULL as user_department 
     user_id ,NULL as user_name , user_department
 ) as t group by user_id

Is it possible to run one logrotate check manually?

The way to run all of logrotate is:

logrotate -f /etc/logrotate.conf

that will run the primary logrotate file, which includes the other logrotate configurations as well

increase font size of hyperlink text html

Your font tag is not correct, so it won't work in some browsers. The px unit is used with CSS, not HTML attributes. The font tag should look like this:

<font size="100">

Well, actually it shouldn't be there at all. The font tag is deprecated, you should use CSS to style the content, like you do already with the text-decoration:

<a href="selectTopic?html" style="font-size: 100px; text-decoration: none">HTML 5</a>

To separate the content from the styling, you should of course work towards putting the CSS in a style sheet rather than as inline style attributes. That way you can apply one style to several elements without having to put the same style attribute in all of them.


<a href="selectTopic?html" class="topic">HTML 5</a>


.topic { font-size: 100px; text-decoration: none; }

Selenium C# WebDriver: Wait until element is present

You can also use


So you will search for an element availability like that

new WebDriverWait(driver, TimeSpan.FromSeconds(timeOut)).Until(ExpectedConditions.ElementExists((By.Id(login))));


In Tensorflow, get the names of all the Tensors in a graph

The accepted answer only gives you a list of strings with the names. I prefer a different approach, which gives you (almost) direct access to the tensors:

graph = tf.get_default_graph()
list_of_tuples = [op.values() for op in graph.get_operations()]

list_of_tuples now contains every tensor, each within a tuple. You could also adapt it to get the tensors directly:

graph = tf.get_default_graph()
list_of_tuples = [op.values()[0] for op in graph.get_operations()]

Extract Number from String in Python

a = []
line = "abcd 3455 ijkl 56.78 ij"
for word in line.split():
  except ValueError:


3455.0 56.78 Trust anchor for certification path not found

The reason this occur is the JVM/Dalvik haven't not confidence in the CA certificates in the system or in the user certificate stores.

To fix this with Retrofit, If you are used okhttp, with another client it's very similar.
You've to do:

A). Create a cert store contain public Key of CA. To do this you need to launch next script for *nix. You need openssl install in your machine, and download from the jar bcprov-jdk16-1.46.jar. Download this version not other, the version 1.5x is not compatible with android 4.0.4.


if [ -z $1 ]; then
  echo "Usage: cert2Android<CA cert PEM file>"
  exit 1


ALIAS=`openssl x509 -inform PEM -subject_hash -noout -in $CACERT`

if [ -f $TRUSTSTORE ]; then
    rm $TRUSTSTORE || exit 1

echo "Adding certificate to $TRUSTSTORE..."
keytool -import -v -trustcacerts -alias $ALIAS \
      -file $CACERT \
      -keystore $TRUSTSTORE -storetype BKS \
      -providerclass org.bouncycastle.jce.provider.BouncyCastleProvider \
      -providerpath $BCJAR \
      -storepass secret

echo "" 
echo "Added '$CACERT' with alias '$ALIAS' to $TRUSTSTORE..."

B). Copy the file truststore mytruststore.bks in res/raw of your project truststore location

C). Setting SSLContext of the connection:

okHttpClient = new OkHttpClient();
try {
    KeyStore ksTrust = KeyStore.getInstance("BKS");
    InputStream instream = context.getResources().openRawResource(R.raw.mytruststore);
    ksTrust.load(instream, "secret".toCharArray());

    // TrustManager decides which certificate authorities to use.
    TrustManagerFactory tmf = TrustManagerFactory
    SSLContext sslContext = SSLContext.getInstance("TLS");
    sslContext.init(null, tmf.getTrustManagers(), null);

} catch (KeyStoreException | IOException | NoSuchAlgorithmException | CertificateException | KeyManagementException e) {

Check if value exists in Postgres array

but if you have other ways to do it please share.

You can compare two arrays. If any of the values in the left array overlap the values in the right array, then it returns true. It's kind of hackish, but it works.

SELECT '{1}'   && '{1,2,3}'::int[];  -- true
SELECT '{1,4}' && '{1,2,3}'::int[];  -- true
SELECT '{4}'   && '{1,2,3}'::int[];  -- false
  • In the first and second query, value 1 is in the right array
  • Notice that the second query is true, even though the value 4 is not contained in the right array
  • For the third query, no values in the left array (i.e., 4) are in the right array, so it returns false

How can I tell what edition of SQL Server runs on the machine?

select @@version

Sample Output

Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64) Mar 29 2009 10:11:52 Copyright (c) 1988-2008 Microsoft Corporation Developer Edition (64-bit) on Windows NT 6.1 (Build 7600: )

If you just want to get the edition, you can use:

select serverproperty('Edition')

To use in an automated script, you can get the edition ID, which is an integer:

select serverproperty('EditionID')
  • -1253826760 = Desktop
  • -1592396055 = Express
  • -1534726760 = Standard
  • 1333529388 = Workgroup
  • 1804890536 = Enterprise
  • -323382091 = Personal
  • -2117995310 = Developer
  • 610778273 = Enterprise Evaluation
  • 1044790755 = Windows Embedded SQL
  • 4161255391 = Express with Advanced Services

Set line height in Html <p> to make the html looks like a office word when <p> has different font sizes

Actually, you can achieve this pretty easy. Simply specify the line height as a number:

<p style="line-height:1.5">
    <span style="font-size:12pt">The quick brown fox jumps over the lazy dog.</span><br />
    <span style="font-size:24pt">The quick brown fox jumps over the lazy dog.</span>

The difference between number and percentage in the context of the line-height CSS property is that the number value is inherited by the descendant elements, but the percentage value is first computed for the current element using its font size and then this computed value is inherited by the descendant elements.

For more information about the line-height property, which indeed is far more complex than it looks like at first glance, I recommend you take a look at this online presentation.

Convert Swift string to array

You can also create an extension:

var strArray = "Hello, playground".Letterize()

extension String {
    func Letterize() -> [String] {
        return map(self) { String($0) }

How to properly add cross-site request forgery (CSRF) token using PHP

CSRF protection





<input type="hidden" name="token" value="{{ form_token() }}" />


<meta name="csrf-token" content="{{ csrf_token() }}">


    headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')


use Illuminate\Http\Request;

Route::get('/token', function (Request $request) {
    $token = $request->session()->token();

    $token = csrf_token();

    // ...




namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as Middleware;

class VerifyCsrfToken extends Middleware
     * The URIs that should be excluded from CSRF verification.
     * @var array
    protected $except = [


You have to override your ; delimiter with something like $$ to avoid this kind of error.

After your function definition, you can set the delimiter back to ;.

This should work:

CREATE FUNCTION F_Dist3D (x1 decimal, y1 decimal) 
RETURNS decimal
  DECLARE dist decimal;
  SET dist = SQRT(x1 - y1);
  RETURN dist;

How to change option menu icon in the action bar?

  1. Change your custom overflow icon of Actionbar in styles.xml

        <!-- Base application theme. -->
        <style name=“MyTheme" parent="@android:style/Theme.Holo">
           <!-- Pointer to Overflow style DONT forget! -->
           <item name="android:actionOverflowButtonStyle">@style/MyOverFlow</item>
        <!-- Styles -->
        <style name="MyOverFlow" parent="@android:style/Widget.Holo.ActionButton.Overflow">
            <item name="android:src">@drawable/ic_your_action_overflow</item>
  2. Put custom theme "MyTheme" in application tag of AndroidManifest.xml


Have fun.@.@

How to use [DllImport("")] in C#?

You can't declare an extern local method inside of a method, or any other method with an attribute. Move your DLL import into the class:

using System.Runtime.InteropServices;

public class WindowHandling
    public static extern int SetForegroundWindow(IntPtr point);

    public void ActivateTargetApplication(string processName, List<string> barcodesList)
        Process p = Process.Start("notepad++.exe");
        IntPtr h = p.MainWindowHandle;
        IntPtr processFoundWindow = p.MainWindowHandle;
} vs onClick

Onclick Function Jquery

$('#selector').click(function(){ //Your Functionality });

how to display data values on Chart.js

Late edit: there is an official plugin for Chart.js 2.7.0+ to do this:

Original answer:

You can loop through the points / bars onAnimationComplete and display the values


enter image description here


<canvas id="myChart1" height="300" width="500"></canvas>
<canvas id="myChart2" height="300" width="500"></canvas>


var chartData = {
    labels: ["January", "February", "March", "April", "May", "June"],
    datasets: [
            fillColor: "#79D1CF",
            strokeColor: "#79D1CF",
            data: [60, 80, 81, 56, 55, 40]

var ctx = document.getElementById("myChart1").getContext("2d");
var myLine = new Chart(ctx).Line(chartData, {
    showTooltips: false,
    onAnimationComplete: function () {

        var ctx = this.chart.ctx;
        ctx.font = this.scale.font;
        ctx.fillStyle = this.scale.textColor
        ctx.textAlign = "center";
        ctx.textBaseline = "bottom";

        this.datasets.forEach(function (dataset) {
            dataset.points.forEach(function (points) {
                ctx.fillText(points.value, points.x, points.y - 10);

var ctx = document.getElementById("myChart2").getContext("2d");
var myBar = new Chart(ctx).Bar(chartData, {
    showTooltips: false,
    onAnimationComplete: function () {

        var ctx = this.chart.ctx;
        ctx.font = this.scale.font;
        ctx.fillStyle = this.scale.textColor
        ctx.textAlign = "center";
        ctx.textBaseline = "bottom";

        this.datasets.forEach(function (dataset) {
            dataset.bars.forEach(function (bar) {
                ctx.fillText(bar.value, bar.x, bar.y - 5);

Fiddle -

Is there a way since (iOS 7's release) to get the UDID without using iTunes on a PC/Mac?

Or use my solution here will let you access UDID and email it to whoever you choose too.

Where can I download mysql jdbc jar from?

Here's a one-liner using Maven:

mvn dependency:get -Dartifact=mysql:mysql-connector-java:5.1.38

Then, with default settings, it's available in:


Just replace the version number if you need a different one.

Setting PHP tmp dir - PHP upload not working

In my case, it was the open_basedir which was defined. I commented it out (default) and my issue was resolved. I can now set the upload directory anywhere.

How to create full compressed tar file using Python?

To build a .tar.gz (aka .tgz) for an entire directory tree:

import tarfile
import os.path

def make_tarfile(output_filename, source_dir):
    with, "w:gz") as tar:
        tar.add(source_dir, arcname=os.path.basename(source_dir))

This will create a gzipped tar archive containing a single top-level folder with the same name and contents as source_dir.

When can I use a forward declaration?

Lakos distinguishes between class usage

  1. in-name-only (for which a forward declaration is sufficient) and
  2. in-size (for which the class definition is needed).

I've never seen it pronounced more succinctly :)

how to print json data in console.log

console.log(JSON.stringify(data)) will do what you need. I'm assuming that you're using jQuery based on your code.

If you're wanting those two particular values, you can just access those and pass them to log.


RGB to hex and hex to RGB

I whipped up this for use with lodash. It will convert an RGB string such as "30,209,19" to its corresponding hex string "#1ed113":

var rgb = '30,209,19';

var hex = _.reduce(rgb.split(','), function(hexAccumulator, rgbValue) {
    var intColor = _.parseInt(rgbValue);

    if (_.isNaN(intColor)) {
        throw new Error('The value ' + rgbValue + ' was not able to be converted to int');

    // Ensure a value such as 2 is converted to "02".
    var hexColor = _.padLeft(intColor.toString(16), 2, '0');

    return hexAccumulator + hexColor;
}, '#');

Remove Sub String by using Python

>>> import re
>>> st = " i think mabe 124 + <font color=\"black\"><font face=\"Times New Roman\">but I don't have a big experience it just how I see it in my eyes <font color=\"green\"><font face=\"Arial\">fun stuff"
>>> re.sub("<.*?>","",st)
" i think mabe 124 + but I don't have a big experience it just how I see it in my eyes fun stuff"

What is an .inc and why use it?

This is a convention that programmer usually use to identify different file names for include files. So that if the other developers is working on their code, he can easily identify why this file is there and what is purpose of this file by just seeing the name of the file.

Selecting non-blank cells in Excel with VBA

The following VBA code should get you started. It will copy all of the data in the original workbook to a new workbook, but it will have added 1 to each value, and all blank cells will have been ignored.

Option Explicit

Public Sub exportDataToNewBook()
    Dim rowIndex As Integer
    Dim colIndex As Integer
    Dim dataRange As Range
    Dim thisBook As Workbook
    Dim newBook As Workbook
    Dim newRow As Integer
    Dim temp

    '// set your data range here
    Set dataRange = Sheet1.Range("A1:B100")

    '// create a new workbook
    Set newBook = Excel.Workbooks.Add

    '// loop through the data in book1, one column at a time
    For colIndex = 1 To dataRange.Columns.Count
        newRow = 0
        For rowIndex = 1 To dataRange.Rows.Count
            With dataRange.Cells(rowIndex, colIndex)

            '// ignore empty cells
            If .value <> "" Then
                newRow = newRow + 1
                temp = doSomethingWith(.value)
                newBook.ActiveSheet.Cells(newRow, colIndex).value = temp
                End If

            End With
        Next rowIndex
    Next colIndex
End Sub

Private Function doSomethingWith(aValue)

    '// This is where you would compute a different value
    '// for use in the new workbook
    '// In this example, I simply add one to it.
    aValue = aValue + 1

    doSomethingWith = aValue
End Function

how to get the child node in div using javascript

var tds = document.getElementById("ctl00_ContentPlaceHolder1_Jobs_dlItems_ctl01_a").getElementsByTagName("td");
time = tds[0].firstChild.value;
address = tds[3].firstChild.value;

In Spring MVC, how can I set the mime type header when using @ResponseBody

My version of reality. Loading a HTML file and streaming to the browser.

public class UIController {

    @RequestMapping(value="index", method=RequestMethod.GET, produces = "text/html")
    public @ResponseBody String GetBootupFile() throws IOException  {
        Resource resource = new ClassPathResource("MainPage.html");
        String fileContents = FileUtils.readFileToString(resource.getFile());
        return fileContents;

Cannot ignore .idea/workspace.xml - keeps popping up

Just tell git to not assume it is changed never matter what:

git update-index --assume-unchanged src/file/to/ignore

yes, you can remove the files from the git repository. But if your team all use the same IDE or you are by yourself, you probably don't want to do that. For yourself, you want to have an ok starting point to resume working, for your teammates as well.

how to get param in method post spring mvc?

When I want to get all the POST params I am using the code below,

@RequestMapping(value = "/", method = RequestMethod.POST)
public ViewForResponseClass update(@RequestBody AClass anObject) {
    // Source..

I am using the @RequestBody annotation for post/put/delete http requests instead of the @RequestParam which reads the GET parameters.

java: Class.isInstance vs Class.isAssignableFrom

Both answers are in the ballpark but neither is a complete answer.

MyClass.class.isInstance(obj) is for checking an instance. It returns true when the parameter obj is non-null and can be cast to MyClass without raising a ClassCastException. In other words, obj is an instance of MyClass or its subclasses.

MyClass.class.isAssignableFrom(Other.class) will return true if MyClass is the same as, or a superclass or superinterface of, Other. Other can be a class or an interface. It answers true if Other can be converted to a MyClass.

A little code to demonstrate:

public class NewMain
    public static void main(String[] args)
        NewMain nm = new NewMain();

    class A { }

    class B extends A { }

    public void doit()
        A myA = new A();
        B myB = new B();
        A[] aArr = new A[0];
        B[] bArr = new B[0];

        System.out.println("b instanceof a: " + (myB instanceof A)); // true
        System.out.println("b isInstance a: " + A.class.isInstance(myB)); //true
        System.out.println("a isInstance b: " + B.class.isInstance(myA)); //false
        System.out.println("b isAssignableFrom a: " + A.class.isAssignableFrom(B.class)); //true
        System.out.println("a isAssignableFrom b: " + B.class.isAssignableFrom(A.class)); //false
        System.out.println("bArr isInstance A: " + A.class.isInstance(bArr)); //false
        System.out.println("bArr isInstance aArr: " + aArr.getClass().isInstance(bArr)); //true
        System.out.println("bArr isAssignableFrom aArr: " + aArr.getClass().isAssignableFrom(bArr.getClass())); //true

Nginx Different Domains on Same IP

Your "listen" directives are wrong. See this page:

They should be

server {
    listen      80;
    root /var/www/domain1;

server {
    listen       80;
    root /var/www/domain2;

Note, I have only included the relevant lines. Everything else looked okay but I just deleted it for clarity. To test it you might want to try serving a text file from each server first before actually serving php. That's why I left the 'root' directive in there.

JavaScript equivalent of PHP's in_array()

Add this code to you project and use the object-style inArray methods

if (!Array.prototype.inArray) {
    Array.prototype.inArray = function(element) {
        return this.indexOf(element) > -1;
//How it work
var array = ["one", "two", "three"];
//Return true

Stratified Train/Test-split in scikit-learn

In addition to the accepted answer by @Andreas Mueller, just want to add that as @tangy mentioned above:

StratifiedShuffleSplit most closely resembles train_test_split(stratify = y) with added features of:

  1. stratify by default
  2. by specifying n_splits, it repeatedly splits the data

Remove table row after clicking table row delete button

You can use jQuery click instead of using onclick attribute, Try the following:

$('table').on('click', 'input[type="button"]', function(e){


Jenkins: Cannot define variable in pipeline stage

The Declarative model for Jenkins Pipelines has a restricted subset of syntax that it allows in the stage blocks - see the syntax guide for more info. You can bypass that restriction by wrapping your steps in a script { ... } block, but as a result, you'll lose validation of syntax, parameters, etc within the script block.

How can I display an RTSP video stream in a web page?

Found a simple and working solution from VLC official documentation for web plugin

Modified the code a little bit and got it working. Here is my code-

<embed type="application/x-vlc-plugin" pluginspage="" autoplay="yes" loop="no" width="300" height="200" target="rtsp://" />
<object classid="clsid:9BE31822-FDAD-461B-AD51-BE1D1C159921" codebase="" style="display:none;"></object>

Note: The above snippet uses the rtsp url format that is supported by my IP camera. So you need to get the same for your camera. You can get this information by consulting your camera vendor support. Also keep in mind that I tested it on Chrome (using an activeX plugin for Chrome) and other browsers (including mobile phone browsers) might not be supported.

How to return a result from a VBA function

Just setting the return value to the function name is still not exactly the same as the Java (or other) return statement, because in java, return exits the function, like this:

public int test(int x) {
    if (x == 1) {
        return 1; // exits immediately

    // still here? return 0 as default.
    return 0;

In VB, the exact equivalent takes two lines if you are not setting the return value at the end of your function. So, in VB the exact corollary would look like this:

Public Function test(ByVal x As Integer) As Integer
    If x = 1 Then
        test = 1 ' does not exit immediately. You must manually terminate...
        Exit Function ' to exit
    End If

    ' Still here? return 0 as default.
    test = 0
    ' no need for an Exit Function because we're about to exit anyway.
End Function 

Since this is the case, it's also nice to know that you can use the return variable like any other variable in the method. Like this:

Public Function test(ByVal x As Integer) As Integer

    test = x ' <-- set the return value

    If test <> 1 Then ' Test the currently set return value
        test = 0 ' Reset the return value to a *new* value
    End If

End Function 

Or, the extreme example of how the return variable works (but not necessarily a good example of how you should actually code)—the one that will keep you up at night:

Public Function test(ByVal x As Integer) As Integer

    test = x ' <-- set the return value

    If test > 0 Then

        test = test(test - 1)

    End If

End Function

how to fetch array keys with jQuery?

Don't Reinvent the Wheel, Use Underscore

I know the OP specifically mentioned jQuery but I wanted to put an answer here to introduce people to the helpful Underscore library if they are not aware of it already.

By leveraging the keys method in the Underscore library, you can simply do the following:

_.keys(foo)  #=> ["alfa", "beta"]

Plus, there's a plethora of other useful functions that are worth perusing.

How to add property to a class dynamically?

How to add property to a python class dynamically?

Say you have an object that you want to add a property to. Typically, I want to use properties when I need to begin managing access to an attribute in code that has downstream usage, so that I can maintain a consistent API. Now I will typically add them to the source code where the object is defined, but let's assume you don't have that access, or you need to truly dynamically choose your functions programmatically.

Create a class

Using an example based on the documentation for property, let's create a class of object with a "hidden" attribute and create an instance of it:

class C(object):
    '''basic class'''
    _x = None

o = C()

In Python, we expect there to be one obvious way of doing things. However, in this case, I'm going to show two ways: with decorator notation, and without. First, without decorator notation. This may be more useful for the dynamic assignment of getters, setters, or deleters.

Dynamic (a.k.a. Monkey Patching)

Let's create some for our class:

def getx(self):
    return self._x

def setx(self, value):
    self._x = value

def delx(self):
    del self._x

And now we assign these to the property. Note that we could choose our functions programmatically here, answering the dynamic question:

C.x = property(getx, setx, delx, "I'm the 'x' property.")

And usage:

>>> o.x = 'foo'
>>> o.x
>>> del o.x
>>> print(o.x)
>>> help(C.x)
Help on property:

    I'm the 'x' property.


We could do the same as we did above with decorator notation, but in this case, we must name the methods all the same name (and I'd recommend keeping it the same as the attribute), so programmatic assignment is not so trivial as it is using the above method:

def x(self):
    '''I'm the 'x' property.'''
    return self._x

def x(self, value):
    self._x = value

def x(self):
    del self._x

And assign the property object with its provisioned setters and deleters to the class:

C.x = x

And usage:

>>> help(C.x)
Help on property:

    I'm the 'x' property.

>>> o.x
>>> o.x = 'foo'
>>> o.x
>>> del o.x
>>> print(o.x)

Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path

In this case that you know that you have all items in the first place on array you can parse the string to JArray and then parse the first item using JObject.Parse

var  jsonArrayString = @"
    ""country"": ""India"",
    ""city"": ""Mall Road, Gurgaon"",
    ""country"": ""India"",
    ""city"": ""Mall Road, Kanpur"",
JArray jsonArray = JArray.Parse(jsonArrayString);
dynamic data = JObject.Parse(jsonArray[0].ToString());

Pipe subprocess standard output to a variable

To get the output of ls, use stdout=subprocess.PIPE.

>>> proc = subprocess.Popen('ls', stdout=subprocess.PIPE)
>>> output =
>>> print output

The command cdrecord --help outputs to stderr, so you need to pipe that indstead. You should also break up the command into a list of tokens as I've done below, or the alternative is to pass the shell=True argument but this fires up a fully-blown shell which can be dangerous if you don't control the contents of the command string.

>>> proc = subprocess.Popen(['cdrecord', '--help'], stderr=subprocess.PIPE)
>>> output =
>>> print output
Usage: wodim [options] track1...trackn
    -version    print version information and exit
    dev=target  SCSI target to use as CD/DVD-Recorder
    gracetime=# set the grace time before starting to write to #.

If you have a command that outputs to both stdout and stderr and you want to merge them, you can do that by piping stderr to stdout and then catching stdout.

subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)

As mentioned by Chris Morgan, you should be using proc.communicate() instead of

>>> proc = subprocess.Popen(['cdrecord', '--help'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
>>> out, err = proc.communicate()
>>> print 'stdout:', out
>>> print 'stderr:', err
stderr:Usage: wodim [options] track1...trackn
    -version    print version information and exit
    dev=target  SCSI target to use as CD/DVD-Recorder
    gracetime=# set the grace time before starting to write to #.

Proper way to set response status and JSON content in a REST API made with nodejs and express

The standard way to get full HttpResponse that includes following properties

  1. body //contains your data
  2. headers
  3. ok
  4. status
  5. statusText
  6. type
  7. url

On backend, do this'/signup', (req, res, next) => {
    // res object have its own statusMessage property so utilize this
    res.statusText = 'Your have signed-up succesfully'
    return res.status(200).send('You are doing a great job')

On Frontend e.g. in Angular, just do:

let url = ``, { profile: data }, {
    observe: 'response' // remember to add this, you'll get pure HttpResponse
}).subscribe(response => {

Can we call the function written in one JavaScript in another JS file?

yes you can . you need to refer both JS file to the .aspx page

<script language="javascript" type="text/javascript" src="JScript1.js">

    <script language="javascript" type="text/javascript" src="JScript2.js">


function ani1() {
function ani2() {

Logcat not displaying my log calls

In my case I just had to add a name to the String. In first instance I just had a space in between the brackets

private static final String TAG = " ";

but after adding a name it worked perfectly.

private static final String TAG = "oncreate";

When do I need to use Begin / End Blocks and the Go keyword in SQL Server?

You need BEGIN ... END to create a block spanning more than one statement. So, if you wanted to do 2 things in one 'leg' of an IF statement, or if you wanted to do more than one thing in the body of a WHILE loop, you'd need to bracket those statements with BEGIN...END.

The GO keyword is not part of SQL. It's only used by Query Analyzer to divide scripts into "batches" that are executed independently.

Javamail Could not convert socket to TLS GMail

After a full day of search, I disabled Avast for 10 minutes and Windows Firewall (important) and everything started working!

This was my error:

Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS; nested exception is: PKIX path building failed: unable to find valid certification path to requested target. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS; nested exception is: PKIX path building failed: unable to find valid certification path to requested target  

Here is how to fix the issue in Avast 19.8.2393 by adding an exclusion to SMTP port 587 (or whichever port your application uses):

  1. Open Avast

  2. Click on 'Settings'

  3. Click on 'Troubleshooting' and then 'Open old settings'

enter image description here

  1. Click again on 'Troubleshooting', scroll down to 'Redirect settings' and delete the port that your app uses.

enter image description here

In my case, I just removed 587 from SMTP ports.

Now I am able to use Avast and also have my Windows Firewall switched on (no need to add additional exclusion for the Firewall).

Here are my e-mail properties:

###### I am using a Google App Password which I generated in my Gmail Security settings ###### =
spring.mail.port = 587
spring.mail.protocol = smtp
spring.mail.username = gmail account
spring.mail.password = password

Extract year from date

if all your dates are the same width, you can put the dates in a vector and use substring

a <- c("01/01/2009", "01/01/2010" , "01/01/2011")
substring(a,7,10) #This takes string and only keeps the characters beginning in position 7 to position 10


[1] "2009" "2010" "2011"

SPAN vs DIV (inline-block)

  1. Inline-block is a halfway point between setting an element’s display to inline or to block. It keeps the element in the inline flow of the document like display:inline does, but you can manipulate the element’s box attributes (width, height and vertical margins) like you can with display:block.

  2. We must not use block elements within inline elements. This is invalid and there is no reason to do such practices.

Find row number of matching value

For your first method change ws.Range("A") to ws.Range("A:A") which will search the entirety of column a, like so:

Sub Find_Bingo()

        Dim wb As Workbook
        Dim ws As Worksheet
        Dim FoundCell As Range
        Set wb = ActiveWorkbook
        Set ws = ActiveSheet

            Const WHAT_TO_FIND As String = "Bingo"

            Set FoundCell = ws.Range("A:A").Find(What:=WHAT_TO_FIND)
            If Not FoundCell Is Nothing Then
                MsgBox (WHAT_TO_FIND & " found in row: " & FoundCell.Row)
                MsgBox (WHAT_TO_FIND & " not found")
            End If
End Sub

For your second method, you are using Bingo as a variable instead of a string literal. This is a good example of why I add Option Explicit to the top of all of my code modules, as when you try to run the code it will direct you to this "variable" which is undefined and not intended to be a variable at all.

Additionally, when you are using With...End With you need a period . before you reference Cells, so Cells should be .Cells. This mimics the normal qualifying behavior (i.e. Sheet1.Cells.Find..)

Change Bingo to "Bingo" and change Cells to .Cells

With Sheet1
        Set FoundCell = .Cells.Find(What:="Bingo", After:=.Cells(1, 1), _
        LookIn:=xlValues, lookat:=xlPart, SearchOrder:=xlByRows, _
        SearchDirection:=xlNext, MatchCase:=False, SearchFormat:=False)
    End With

If Not FoundCell Is Nothing Then
        MsgBox ("""Bingo"" found in row " & FoundCell.Row)
        MsgBox ("Bingo not found")
End If


In my

With Sheet1
End With

The Sheet1 refers to a worksheet's code name, not the name of the worksheet itself. For example, say I open a new blank Excel workbook. The default worksheet is just Sheet1. I can refer to that in code either with the code name of Sheet1 or I can refer to it with the index of Sheets("Sheet1"). The advantage to using a codename is that it does not change if you change the name of the worksheet.

Continuing this example, let's say I renamed Sheet1 to Data. Using Sheet1 would continue to work, as the code name doesn't change, but now using Sheets("Sheet1") would return an error and that syntax must be updated to the new name of the sheet, so it would need to be Sheets("Data").

In the VB Editor you would see something like this:

code object explorer example

Notice how, even though I changed the name to Data, there is still a Sheet1 to the left. That is what I mean by codename.

The Data worksheet can be referenced in two ways:

Debug.Print Sheet1.Name
Debug.Print Sheets("Data").Name

Both should return Data

More discussion on worksheet code names can be found here.

How to convert a column of DataTable to a List

Here you go.

           DataTable defaultDataTable = defaultDataSet.Tables[0];
           var list = (from x in defaultDataTable.AsEnumerable()
                    where x.Field<string>("column1") == something
                    select x.Field<string>("column2")).ToList();

If you need the first column

           var list = (from x in defaultDataTable.AsEnumerable()
                    where x.Field<string>(1) == something
                    select x.Field<string>(1)).ToList();

How to get the CUDA version?

You can check the version of CUDA using

nvcc -V

or you can use

nvcc --version

or You can check the location of where the CUDA is using

whereis cuda 

and then do

cat location/of/cuda/you/got/from/above/command

How to stop docker under Linux

The output of ps aux looks like you did not start docker through systemd/systemctl.

It looks like you started it with:

sudo dockerd -H gridsim1103:2376

When you try to stop it with systemctl, nothing should happen as the resulting dockerd process is not controlled by systemd. So the behavior you see is expected.

The correct way to start docker is to use systemd/systemctl:

systemctl enable docker
systemctl start docker

After this, docker should start on system start.

EDIT: As you already have the docker process running, simply kill it by pressing CTRL+C on the terminal you started it. Or send a kill signal to the process.

How to run a Powershell script from the command line and pass a directory as a parameter

Using the flag -Command you can execute your entire powershell line as if it was a command in the PowerShell prompt:

powershell -Command "& '<PATH_TO_PS1_FILE>' '<ARG_1>' '<ARG_2>' ... '<ARG_N>'"

This solved my issue with running PowerShell commands in Visual Studio Post-Build and Pre-Build events.

How to really read text file from classpath in Java

I am using webshpere application server and my Web Module is build on Spring MVC. The were located in the resources folder, i tried to load this files using the following:

  1. this.getClass().getClassLoader().getResourceAsStream("");
  2. this.getClass().getResourceAsStream("/");

None of the above code loaded the file.

But with the help of below code the property file was loaded successfully:


Thanks to the user "user1695166".

How to change the default collation of a table?

may need to change the SCHEMA not only table

ALTER SCHEMA `<database name>`  DEFAULT CHARACTER SET utf8mb4  DEFAULT COLLATE utf8mb4_unicode_ci (as Rich said - utf8mb4);

(mariaDB 10)

bash string equality

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

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

How can I pass arguments to a batch file?

Another useful tip is to use %* to mean "all". For example:

echo off
set arg1=%1
set arg2=%2
fake-command /u %arg1% /p %arg2% %*

When you run:

test-command admin password foo bar

the above batch file will run:

fake-command /u admin /p password admin password foo bar

I may have the syntax slightly wrong, but this is the general idea.

Splitting a C++ std::string using tokens, e.g. ";"

You could use a string stream and read the elements into the vector.

Here are many different examples...

A copy of one of the examples:

std::vector<std::string> split(const std::string& s, char seperator)
   std::vector<std::string> output;

    std::string::size_type prev_pos = 0, pos = 0;

    while((pos = s.find(seperator, pos)) != std::string::npos)
        std::string substring( s.substr(prev_pos, pos-prev_pos) );


        prev_pos = ++pos;

    output.push_back(s.substr(prev_pos, pos-prev_pos)); // Last word

    return output;

How do I use regex in a SQLite query?

In case if someone looking non-regex condition for Android Sqlite, like this string [1,2,3,4,5] then don't forget to add bracket([]) same for other special characters like parenthesis({}) in @phyatt condition

WHERE ( x == '[3]' OR
        x LIKE '%,3]' OR
        x LIKE '[3,%' OR
        x LIKE '%,3,%');

Path of assets in CSS files in Symfony 2

I offen manage css/js plugin with composer which install it under vendor. I symlink those to the web/bundles directory, that's let composer update bundles as needed.


1 - symlink once at all (use command fromweb/bundles/

ln -sf vendor/select2/select2/dist/ select2

2 - use asset where needed, in twig template :

{{ asset('bundles/select2/css/fileinput.css) }}


css background image in a different folder from css

You are using a relative path. You should use the absolute path, url(/assets/css/style.css).

How can I iterate over the elements in Hashmap?

Need Key & Value in Iteration

Use entrySet() to iterate through Map and need to access value and key:

Map<String, Person> hm = new HashMap<String, Person>();

hm.put("A", new Person("p1"));
hm.put("B", new Person("p2"));
hm.put("C", new Person("p3"));
hm.put("D", new Person("p4"));
hm.put("E", new Person("p5"));

Set<Map.Entry<String, Person>> set = hm.entrySet();

for (Map.Entry<String, Person> me : set) {
  System.out.println("Key :"+me.getKey() +" Name : "+ me.getValue().getName()+"Age :"+me.getValue().getAge());


Need Key in Iteration

If you want just to iterate over keys of map you can use keySet()

for(String key: map.keySet()) {
     Person value = map.get(key); 

Need Value in Iteration

If you just want to iterate over values of map you can use values()

for(Person person: map.values()) {


Modify a Column's Type in sqlite3

SQLite doesn't support removing or modifying columns, apparently. But do remember that column data types aren't rigid in SQLite, either.

See also:

How to merge a transparent png image with another image using PIL

One can also use blending:

im1 ="im1.png")
im2 ="im2.png")
blended = Image.blend(im1, im2, alpha=0.5)"blended.png")

Align image to left of text on same line - Twitter Bootstrap3

Use Nesting column

To nest your content with the default grid, add a new .row and set of .col-sm-* columns within an existing .col-sm-* column. Nested rows should include a set of columns that add up to 12 or fewer (it is not required that you use all 12 available columns).

enter image description here

<div class="row">_x000D_
  <div class="col-sm-9">_x000D_
    Level 1: .col-sm-9_x000D_
    <div class="row">_x000D_
      <div class="col-xs-8 col-sm-6">_x000D_
        Level 2: .col-xs-8 .col-sm-6_x000D_
      <div class="col-xs-4 col-sm-6">_x000D_
        Level 2: .col-xs-4 .col-sm-6_x000D_

How to declare an array of strings in C++?

#include <iostream>
#include <string>
#include <vector>
#include <boost/assign/list_of.hpp>

int main()
    const std::vector< std::string > v = boost::assign::list_of( "abc" )( "xyz" );
        std::ostream_iterator< std::string >( std::cout, "\n" ) );

Hide the browse button on a input type=file

the best way for it

<input type="file" id="file">
<label for="file" class="file-trigger">Click Me</label> 

And you can style your "label" element

#file { 
   display: none;
.file-trigger {
/* your style */

jQuery Scroll to bottom of page/iframe

If you don't care about animation, then you don't have to get the height of the element. At least in all the browsers I've tried, if you give scrollTop a number that's bigger than the maximum, it'll just scroll to the bottom. So give it the biggest number possible:


If you want to scroll the page, rather than some element with a scrollbar, just make myScrollingElement equal to 'body, html'.

Since I need to do this in several places, I've written a quick and dirty jQuery function to make it more convenient, like this:

(function($) {
  $.fn.scrollToBottom = function() {
    return this.each(function (i, element) {

So I can do this when I append a buncho' stuff:


Oracle - What TNS Names file am I using?

For Windows: Filemon from SysInternals will show you what files are being accessed.

Remember to set your filters so you are not overwhelmed by the chatty file system traffic.

Filter Dialog

Added: Filemon does not work with newer Windows versions, so you might have to use Process Monitor.




Can be performed with both PUT or POST in the following way:


Creates THE new resource with newResourceId as the identifier, under the /resources URI, or collection.

PUT /resources/<newResourceId> HTTP/1.1 


Creates A new resource under the /resources URI, or collection. Usually the identifier is returned by the server.

POST /resources HTTP/1.1


Can only be performed with PUT in the following way:


Updates the resource with existingResourceId as the identifier, under the /resources URI, or collection.

PUT /resources/<existingResourceId> HTTP/1.1


When dealing with REST and URI as general, you have generic on the left and specific on the right. The generics are usually called collections and the more specific items can be called resource. Note that a resource can contain a collection.


<-- generic -- specific -->

URI:  - whole site
users        - collection of users
john         - item of the collection, or a resource  - whole site
users        - collection of users
john         - item of the collection, or a resource
posts        - collection of posts from john
23           - post from john with identifier 23, also a resource

When you use POST you are always refering to a collection, so whenever you say:

POST /users HTTP/1.1

you are posting a new user to the users collection.

If you go on and try something like this:

POST /users/john HTTP/1.1

it will work, but semantically you are saying that you want to add a resource to the john collection under the users collection.

Once you are using PUT you are refering to a resource or single item, possibly inside a collection. So when you say:

PUT /users/john HTTP/1.1

you are telling to the server update, or create if it doesn't exist, the john resource under the users collection.


Let me highlight some important parts of the spec:


The POST method is used to request that the origin server accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI in the Request-Line

Hence, creates a new resource on a collection.


The PUT method requests that the enclosed entity be stored under the supplied Request-URI. If the Request-URI refers to an already existing resource, the enclosed entity SHOULD be considered as a modified version of the one residing on the origin server. If the Request-URI does not point to an existing resource, and that URI is capable of being defined as a new resource by the requesting user agent, the origin server can create the resource with that URI."

Hence, create or update based on existence of the resource.


Export html table data to Excel using JavaScript / JQuery is not working properly in chrome browser

Instead of using you can use a link with the onclick event.
And you can put the html table into the uri and set the file name to be downloaded.

Live demo :

function exportF(elem) {_x000D_
  var table = document.getElementById("table");_x000D_
  var html = table.outerHTML;_x000D_
  var url = 'data:application/,' + escape(html); // Set your html table into url _x000D_
  elem.setAttribute("href", url);_x000D_
  elem.setAttribute("download", "export.xls"); // Choose the file name_x000D_
  return false;_x000D_
<table id="table" border="1">_x000D_
<a id="downloadLink" onclick="exportF(this)">Export to excel</a>

Can I specify multiple users for myself in .gitconfig?

There is a simple solution that seems to work well for avoiding mistakes.

Simply remove the [user] section from your ~/.gitconfig, which will prevent you from making any commits without setting for each repository.

In your ~/.bashrc, add some simple aliases for the user and email:

alias ggmail='git config "My Name";git config [email protected]'
alias gwork='git config "My Name";git config [email protected]'

How do you pass a function as a parameter in C?

Since C++11 you can use the functional library to do this in a succinct and generic fashion. The syntax is, e.g.,

std::function<bool (int)>

where bool is the return type here of a one-argument function whose first argument is of type int.

I have included an example program below:

// g++ test.cpp --std=c++11
#include <functional>

double Combiner(double a, double b, std::function<double (double,double)> func){
  return func(a,b);

double Add(double a, double b){
  return a+b;

double Mult(double a, double b){
  return a*b;

int main(){

Sometimes, though, it is more convenient to use a template function:

// g++ test.cpp --std=c++11

template<class T>
double Combiner(double a, double b, T func){
  return func(a,b);

double Add(double a, double b){
  return a+b;

double Mult(double a, double b){
  return a*b;

int main(){

How to read a configuration file in Java

It depends.

Start with Basic I/O, take a look at Properties, take a look at Preferences API and maybe even Java API for XML Processing and Java Architecture for XML Binding

And if none of those meet your particular needs, you could even look at using some kind of Database

Onchange open URL via select - jQuery

Another way:

    <script type="text/javascript">
        function change_url(val) {
    <select style="width:130px;" onchange="change_url(this.value);">
            <option value="">Option 1</option>
            <option value="">Option 2</option>

Access camera from a browser

There is a really cool solution from Danny Markov for that. It uses navigator.getUserMedia method and should work in modern browsers. I have tested it successfully with Firefox and Chrome. IE didn't work:

Here is a demo:

Link to Danny Markovs description page:

Link to GitHub:

In c, in bool, true == 1 and false == 0?

You neglected to say which version of C you are concerned about. Let's assume it's this one:

As you can see by reading the specification, the standard definitions of true and false are 1 and 0, yes.

If your question is about a different version of C, or about non-standard definitions for true and false, then ask a more specific question.

Combine [NgStyle] With Condition (if..else)

Using a ternary operator inside the ngStyle binding will function as an if/else condition.

<div [ngStyle]="{'background-image': 'url(' + value ? image : otherImage + ')'}"></div>

How to parse JSON data with jQuery / JavaScript?

var jsonP = "person" : [ { "id" : "1", "name" : "test1" },
  { "id" : "2", "name" : "test2" },
  { "id" : "3", "name" : "test3" },
  { "id" : "4", "name" : "test4" },
  { "id" : "5", "name" : "test5" } ];

var cand = document.getElementById("cand");
var json_arr = [];
    json_arr.push(key+' . '  + '<br>');
    cand.innerHTML = json_arr;

<div id="cand">

How to check if a process is in hang state (Linux)

you could check the files

/proc/[pid]/task/[thread ids]/status

How to select a specific node with LINQ-to-XML

Assuming the ID is unique:

var result = xmldoc.Element("Customers")
                   .Single(x => (int?)x.Attribute("ID") == 2);

You could also use First, FirstOrDefault, SingleOrDefault or Where, instead of Single for different circumstances.

How do I uninstall a Windows service if the files do not exist anymore?

Remove Windows Service via Registry

Its very easy to remove a service from registry if you know the right path. Here is how I did that:

  1. Run Regedit or Regedt32

  2. Go to the registry entry "HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services"

  3. Look for the service that you want delete and delete it. You can look at the keys to know what files the service was using and delete them as well (if necessary).

Delete Windows Service via Command Window

Alternatively, you can also use command prompt and delete a service using following command:

sc delete

You can also create service by using following command

sc create "MorganTechService" binpath= "C:\Program Files\MorganTechSPace\myservice.exe"

Note: You may have to reboot the system to get the list updated in service manager.