Programs & Examples On #Pcdata

Parsed character data(PCDATA) is text node or entity string in XML which is evaluated by the XML processor.

How to convert String to DOM Document object in java?

you can try

DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader("<root><node1></node1></root>"));

Document doc = db.parse(is);

refer this

Difference between PCDATA and CDATA in DTD

CDATA (Character DATA): It is similarly to a comment but it is part of document. i.e. CDATA is a data, it is part of the document but the data can not parsed in XML.
Note: XML comment omits while parsing an XML but CDATA shows as it is.

PCDATA (Parsed Character DATA) :By default, everything is PCDATA. PCDATA is a data, it can be parsed in XML.

swift UITableView set rowHeight

Try code like this copy and paste in the class

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 100

Python list of dictionaries search

Most (if not all) implementations proposed here have two flaws:

  • They assume only one key to be passed for searching, while it may be interesting to have more for complex dict
  • They assume all keys passed for searching exist in the dicts, hence they don't deal correctly with KeyError occuring when it is not.

An updated proposition:

def find_first_in_list(objects, **kwargs):
    return next((obj for obj in objects if
                 len(set(obj.keys()).intersection(kwargs.keys())) > 0 and
                 all([obj[k] == v for k, v in kwargs.items() if k in obj.keys()])),

Maybe not the most pythonic, but at least a bit more failsafe.


>>> obj1 = find_first_in_list(list_of_dict, name='Pam', age=7)
>>> obj2 = find_first_in_list(list_of_dict, name='Pam', age=27)
>>> obj3 = find_first_in_list(list_of_dict, name='Pam', address='nowhere')
>>> print(obj1, obj2, obj3)
{"name": "Pam", "age": 7}, None, {"name": "Pam", "age": 7}

The gist.

MsgBox "" vs MsgBox() in VBScript

A callable piece of code (routine) can be a Sub (called for a side effect/what it does) or a Function (called for its return value) or a mixture of both. As the docs for MsgBox

Displays a message in a dialog box, waits for the user to click a button, and returns a value indicating which button the user clicked.

MsgBox(prompt[, buttons][, title][, helpfile, context])

indicate, this routine is of the third kind.

The syntactical rules of VBScript are simple:

Use parameter list () when calling a (routine as a) Function

If you want to display a message to the user and need to know the user's reponse:

Dim MyVar
MyVar = MsgBox ("Hello World!", 65, "MsgBox Example")
   ' MyVar contains either 1 or 2, depending on which button is clicked.

Don't use parameter list () when calling a (routine as a) Sub

If you want to display a message to the user and are not interested in the response:

MsgBox "Hello World!", 65, "MsgBox Example"

This beautiful simplicity is messed up by:

The design flaw of using () for parameter lists and to force call-by-value semantics

>> Sub S(n) : n = n + 1 : End Sub
>> n = 1
>> S n
>> WScript.Echo n
>> S (n)
>> WScript.Echo n

S (n) does not mean "call S with n", but "call S with a copy of n's value". Programmers seeing that

>> s = "value"
>> MsgBox(s)

'works' are in for a suprise when they try:

>> MsgBox(s, 65, "MsgBox Example")
Error Number:       1044
Error Description:  Cannot use parentheses when calling a Sub

The compiler's leniency with regard to empty () in a Sub call. The 'pure' Sub Randomize (called for the side effect of setting the random seed) can be called by


although the () can neither mean "give me your return value) nor "pass something by value". A bit more strictness here would force prgrammers to be aware of the difference in

Randomize n


Randomize (n)

The Call statement that allows parameter list () in Sub calls:

s = "value" Call MsgBox(s, 65, "MsgBox Example")

which further encourage programmers to use () without thinking.

(Based on What do you mean "cannot use parentheses?")

A potentially dangerous Request.Path value was detected from the client (*)

I had a similar issue in Azure Data Factory with the : character.

I resolved the problem by substituting : with %3A

as shown here.

For example, I substituted




console.log not working in Angular2 Component (Typescript)

It's not working because console.log() it's not in a "executable area" of the class "App".

A class is a structure composed by attributes and methods.

The only way to have your code executed is to place it inside a method that is going to be executed. For instance: constructor()

console.log('It works here')_x000D_
export class App {_x000D_
 s: string = "Hello2";_x000D_
  constructor() {_x000D_
    console.log(this.s)            _x000D_
  }            _x000D_

Think of class like a plain javascript object.

Would it make sense to expect this to work?

class:  {_x000D_
  s: string,_x000D_

If you still unsure, try the typescript playground where you can see your typescript code generated into plain javascript.

Matching special characters and letters in regex

Try this regex:


Also you can use test.

if ( pattern.test( qry ) ) {
  // valid

How do disable paging by swiping with finger in ViewPager but still be able to swipe programmatically?

here is my implementation
that if you want to disable the swipe animation you can you use the swipeListener left and right and still want the scroll by finger but without animation

1-Override Viewpager method onInterceptTouchEvent and onTouchEvent

2- create your own GestureDetector

3- detect the swipe gesture and use the setCurrentItem(item, false)


public class ViewPagerNoSwipe extends ViewPager {
    private final GestureDetector gestureDetector;
    private OnSwipeListener mOnSwipeListener;

    public void setOnSwipeListener(OnSwipeListener onSwipeListener) {
        mOnSwipeListener = onSwipeListener;

    public ViewPagerNoSwipe(@NonNull Context context) {
        gestureDetector = new GestureDetector(context, new GestureListener());


    public ViewPagerNoSwipe(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        gestureDetector = new GestureDetector(context, new GestureListener());


    public boolean onTouchEvent(MotionEvent ev) {
        return true;

    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return false;

    public class GestureListener extends GestureDetector.SimpleOnGestureListener {

        private static final int SWIPE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        public boolean onDown(MotionEvent e) {
            return true;

        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            boolean result = false;
            try {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY)) {
                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffX > 0) {
                        } else {
                        result = true;
                } else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                    if (diffY > 0) {
                    } else {
                    result = true;
            } catch (Exception exception) {
            return result;

    public interface OnSwipeListener {

         void onSwipeRight();

        void onSwipeLeft();

        void onSwipeTop();

        void onSwipeBottom();

the when you are set up the ViewPager set the swipeListener

postsPager.setOnSwipeListener(new ViewPagerNoSwipe.OnSwipeListener() {
            public void onSwipeRight() {

              postsPager.setCurrentItem(postsPager.getCurrentItem() + 1,false);


            public void onSwipeLeft() {

            postsPager.setCurrentItem(postsPager.getCurrentItem() - 1, false);


Skip first entry in for loop in python?

Well, your syntax isn't really Python to begin with.

Iterations in Python are over he contents of containers (well, technically it's over iterators), with a syntax for item in container. In this case, the container is the cars list, but you want to skip the first and last elements, so that means cars[1:-1] (python lists are zero-based, negative numbers count from the end, and : is slicing syntax.

So you want

for c in cars[1:-1]:
    do something with c

No Android SDK found - Android Studio

These days, Android Studio setup do not provide SDK as the part of original package.

In the context of windows, when you start Android Studio 1.3.1, you see the error message saying no sdk found. You just have to proceed and provide the path where sdk can be downloaded. And you are done.

enter image description here

How to remove spaces from a string using JavaScript?

Following @rsplak answer: actually, using split/join way is faster than using regexp. See the performance test case


var result = text.split(' ').join('')

operates faster than

var result = text.replace(/\s+/g, '')

On small texts this is not relevant, but for cases when time is important, e.g. in text analisers, especially when interacting with users, that is important.

On the other hand, \s+ handles wider variety of space characters. Among with \n and \t, it also matches \u00a0 character, and that is what &nbsp; is turned in, when getting text using textDomNode.nodeValue.

So I think that conclusion in here can be made as follows: if you only need to replace spaces ' ', use split/join. If there can be different symbols of symbol class - use replace(/\s+/g, '')

Chaining Observables in RxJS

About promise composition vs. Rxjs, as this is a frequently asked question, you can refer to a number of previously asked questions on SO, among which :

Basically, flatMap is the equivalent of Promise.then.

For your second question, do you want to replay values already emitted, or do you want to process new values as they arrive? In the first case, check the publishReplay operator. In the second case, standard subscription is enough. However you might need to be aware of the cold. vs. hot dichotomy depending on your source (cf. Hot and Cold observables : are there 'hot' and 'cold' operators? for an illustrated explanation of the concept)

No module named _sqlite3

For Python 3.7.8 with Redhat 7 or Centos 7.

  • Install sqlite-devel
$ yum install sqlite-devel
  • Compile and install Python3 with sqllite extensions
$ ./configure --enable-optimizations --enable-loadable-sqlite-extensions
$ make install

initializing strings as null vs. empty string


 std::string subCondition;

This creates an empty string.


std::string myStr = "";

does a copy initialization - creates a temporary string from "", and then uses the copy constructor to create myStr.


std::string myStr("");

does a direct initialization and uses the string(const char*) constructor.

To check if a string is empty, just use empty().

How to write to a JSON file in the correct format

With formatting

require 'json'
tempHash = {
    "key_a" => "val_a",
    "key_b" => "val_b"
}"public/temp.json","w") do |f|



getting the reason why websockets closed with close code 1006

I've got the error while using Chrome as client and golang gorilla websocket as server under nginx proxy

And sending just some "ping" message from server to client every x second resolved problem

How do I get column names to print in this C# program?

Print datatable rows with column

Here is solution 

DataTable datatableinfo= new DataTable();

// Fill data table 

//datatableinfo=fill by function or get data from database

//Print data table with rows and column

for (int j = 0; j < datatableinfo.Rows.Count; j++)
    for (int i = 0; i < datatableinfo.Columns.Count; i++)    
            Console.Write(datatableinfo.Columns[i].ColumnName + " ");    
            Console.WriteLine(datatableinfo.Rows[j].ItemArray[i]+" "); 

Ouput :
ColumnName - row Value
ColumnName - row Value
ColumnName - row Value
ColumnName - row Value

Getting request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource

In case of Request to a REST Service:

You need to allow the CORS (cross origin sharing of resources) on the endpoint of your REST Service with Spring annotation:

@CrossOrigin(origins = "http://localhost:8080")

Very good tutorial:

How to press back button in android programmatically?

You don't need to override onBackPressed() - it's already defined as the action that your activity will do by default when the user pressed the back button. So just call onBackPressed() whenever you want to "programatically press" the back button.

That would only result to finish() being called, though ;)

I think you're confused with what the back button does. By default, it's just a call to finish(), so it just exits the current activity. If you have something behind that activity, that screen will show.

What you can do is when launching your activity from the Login, add a CLEAR_TOP flag so the login activity won't be there when you exit yours.

How do I view Android application specific cache?

Cached files are indeed stored in /data/data/my_app_package/cache

Make sure to store the files using the following method:

String cacheDir = context.getCacheDir();
File imageFile = new File(cacheDir, "image1.jpg");
FileOutputStream out = new FileOutputStream(imageFile);
out.write(imagebuffer, 0, imagebufferlength);

where imagebuffer[] contains image data in byte format and imagebufferlength is the length of the content to be written to the FileOutputStream.

Now, you may look at DDMS File Explorer or do an "adb shell" and cd to /data/data/my_app_package/cache and do an "ls". You will find the image files you have stored through code in this directory.

Moreover, from Android documentation:

If you'd like to cache some data, rather than store it persistently, you should use getCacheDir() to open a File that represents the internal directory where your application should save temporary cache files.

When the device is low on internal storage space, Android may delete these cache files to recover space. However, you should not rely on the system to clean up these files for you. You should always maintain the cache files yourself and stay within a reasonable limit of space consumed, such as 1MB. When the user uninstalls your application, these files are removed.

How to replace a hash key with another key

If all the keys are strings and all of them have the underscore prefix, then you can patch up the hash in place with this:

h.keys.each { |k| h[k[1, k.length - 1]] = h[k]; h.delete(k) }

The k[1, k.length - 1] bit grabs all of k except the first character. If you want a copy, then:

new_h = Hash[ { |k, v| [k[1, k.length - 1], v] }]


new_h = h.inject({ }) { |x, (k,v)| x[k[1, k.length - 1]] = v; x }

You could also use sub if you don't like the k[] notation for extracting a substring:

h.keys.each { |k| h[k.sub(/\A_/, '')] = h[k]; h.delete(k) }
Hash[ { |k, v| [k.sub(/\A_/, ''), v] }]
h.inject({ }) { |x, (k,v)| x[k.sub(/\A_/, '')] = v; x }

And, if only some of the keys have the underscore prefix:

h.keys.each do |k|
  if(k[0,1] == '_')
    h[k[1, k.length - 1]] = h[k]

Similar modifications can be done to all the other variants above but these two:

Hash[ { |k, v| [k.sub(/\A_/, ''), v] }]
h.inject({ }) { |x, (k,v)| x[k.sub(/\A_/, '')] = v; x }

should be okay with keys that don't have underscore prefixes without extra modifications.

Formatting Decimal places in R

You can try my package formattable.

> # devtools::install_github("renkun-ken/formattable")
> library(formattable)
> x <- formattable(1.128347132904321674821, digits = 2, format = "f")
> x
[1] 1.13

The good thing is, x is still a numeric vector and you can do more calculations with the same formatting.

> x + 1
[1] 2.13

Even better, the digits are not lost, you can reformat with more digits any time :)

> formattable(x, digits = 6, format = "f")
[1] 1.128347

Delete all lines beginning with a # from a file

This can be done with a sed one-liner:

sed '/^#/d'

This says, "find all lines that start with # and delete them, leaving everything else."

How can I parse a local JSON file from assets folder into a ListView?

{ // json object node
    "formules": [ // json array formules
    { // json object 
      "formule": "Linear Motion", // string
      "url": "qp1"

What you are doing

  Context context = null; // context is null 
    try {
        String jsonLocation = AssetJSONFile("formules.json", context);

So change to

   try {
        String jsonLocation = AssetJSONFile("formules.json", CatList.this);

To parse

I believe you get the string from the assests folder.

String jsonLocation = AssetJSONFile("formules.json", context);
JSONObject jsonobject = new JSONObject(jsonLocation);
JSONArray jarray = (JSONArray) jsonobject.getJSONArray("formules");
for(int i=0;i<jarray.length();i++)
JSONObject jb =(JSONObject) jarray.get(i);
String formula = jb.getString("formule");
String url = jb.getString("url");
} catch (IOException e) {
} catch (JSONException e) {

CSS selector for a checked radio button's label


This only worked for me because our existing generated html was wacky, generating labels along with radios and giving them both checked attribute.

Never mind, and big ups for Brilliand for bringing it up!

If your label is a sibling of a checkbox (which is usually the case), you can use the ~ sibling selector, and a label[for=your_checkbox_id] to address it... or give the label an id if you have multiple labels (like in this example where I use labels for buttons)

Came here looking for the same - but ended up finding my answer in the docs.

a label element with checked attribute can be selected like so:

label[checked] {

I know it's an old question, but maybe it helps someone out there :)

How to protect Excel workbook using VBA?

To lock whole workbook from opening, Thisworkbook.password option can be used in VBA.

If you want to Protect Worksheets, then you have to first Lock the cells with option Thisworkbook.sheets.cells.locked = True and then use the option Thisworkbook.sheets.protect password:="pwd".

Primarily search for these keywords: Thisworkbook.password or Thisworkbook.Sheets.Cells.Locked

Jquery Date picker Default Date

i suspect that your default date format is different than the scripts default settigns. test your script with the 'dateformat' option

$( "#datepicker" ).datepicker({ 
    dateFormat: 'dd-mm-yy'

instead of dd-mm-yy, your desired format

Taking multiple inputs from user in python

List_of_input=list(map(int,input (). split ()))

It's for Python3.

A div with auto resize when changing window width\height

  <!DOCTYPE html>
   div {

   padding: 20px; 

   resize: both;
  overflow: auto;
   height: 100%;
    width: 100%;
 object-fit: contain;
 <h1>The resize Property</h1>

 <p>Let the user resize both the height and the width of this 1234567891011 div 
 <p>To resize: Click and drag the bottom right corner of this div element.</p>
  <img src="images/scenery.jpg" alt="Italian ">

   <p><b>Note:</b> Internet Explorer does not support the resize property.</p>


Android 'Unable to add window -- token null is not for an application' exception

I got the same exception. what i do to fix this is to pass instance of the dialog as parameter into function and use it instead of pass only context then using getContext(). this solution solve my problem, hope it can help

Excel Macro : How can I get the timestamp in "yyyy-MM-dd hh:mm:ss" format?

this worked best for me:

        Cells(partcount + 5, "N").Value = Date + Time
        Cells(partcount + 5, "N").NumberFormat = "mm/dd/yy hh:mm:ss AM/PM"

Difference between "on-heap" and "off-heap"

Not 100%; however, it sounds like the heap is an object or set of allocated space (on RAM) that is built into the functionality of the code either Java itself or more likely functionality from ehcache itself, and the off-heap Ram is there own system as well; however, it sounds like this is one magnitude slower as it is not as organized, meaning it may not use a heap (meaning one long set of space of ram), and instead uses different address spaces likely making it slightly less efficient.

Then of course the next tier lower is hard-drive space itself.

I don't use ehcache, so you may not want to trust me, but that what is what I gathered from their documentation.

Number of days between past date and current date in Google spreadsheet

  1. Today() does return value in DATE format.

  2. Select your "Days left field" and paste this formula in the field =DAYS360(today(),C2)

  3. Go to Format > Number > More formats >Custom number format and select the number with no decimal numbers.

I tested, it works, at least in new version of Sheets, March 2015.

get number of columns of a particular row in given excel using Java

/** Count max number of nonempty cells in sheet rows */
private int getColumnsCount(XSSFSheet xssfSheet) {
    int result = 0;
    Iterator<Row> rowIterator = xssfSheet.iterator();
    while (rowIterator.hasNext()) {
        Row row =;
        List<Cell> cells = new ArrayList<>();
        Iterator<Cell> cellIterator = row.cellIterator();
        while (cellIterator.hasNext()) {
        for (int i = cells.size(); i >= 0; i--) {
            Cell cell = cells.get(i-1);
            if (cell.toString().trim().isEmpty()) {
            } else {
                result = cells.size() > result ? cells.size() : result;
    return result;

How to use basic authorization in PHP curl

$headers = array(
    'Authorization: Basic '. base64_encode($username.':'.$password),
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

Difference between <span> and <div> with text-align:center;?

Like other have said, span is an in-line element.

See here:

Additionally, you can make a span behave like a div by applying a

style="display: block; margin: 0px auto; text-align: center;"

Function overloading in Javascript - Best practices

Something like this can be done for function overloading.

function addCSS(el, prop, val) {
  return {
    2: function() {
      // when two arguments are set
      // now prop is an oject
      for (var i in prop) {
[i] = prop[i];
    3: function() {
      // when three arguments are set[prop] = val;
// usage
var el = document.getElementById("demo");
addCSS(el, "color", "blue");
addCSS(el, {
    "backgroundColor": "black",
  "padding": "10px"


Add default value of datetime field in SQL Server to a timestamp

Let's say you create a database table for a registration system.

IF OBJECT_ID('dbo.registration_demo', 'U') IS NOT NULL 
  DROP TABLE dbo.registration_demo; 

CREATE TABLE dbo.registration_demo (
    name NVARCHAR(8)

Now a couple people register.

INSERT INTO dbo.registration_demo (name) VALUES

Then you realize you need a timestamp for when they registered.

If this app is limited to a geographically localized region, then you can use the local server time with GETDATE(). Otherwise you should heed Tanner's consideration for the global audience with GETUTCDATE() for the default value.

Add the column with a default value in one statement like this answer.

ALTER TABLE dbo.registration_demo

Let's get another registrant and see what the data looks like.

INSERT INTO dbo.registration_demo (name) VALUES

SELECT * FROM dbo.registration_demo;
id    name    time_registered
1     John    NULL
2     Jane    NULL
3     Jeff    NULL
4     Julia   2016-06-21 14:32:57.767

How to set text color in submit button?

<input type = "button" style ="background-color:green"/>

Access event to call preventdefault from custom function originating from onclick attribute of tag

Without any JS library or jQuery. To open a nice popup window if possible. Fails safely to normal link open.

<a href="" onclick="onclick="openNewWindow(event, this.href);">...</a>

And the helper function:

function openNewWindow(event, location) {
  if (event.preventDefault && event.stopImmediatePropagation) { 
  } else {
    event.returnValue = false; 
  }, 'targetWindow', 'toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=800,height=450');

How do I center this form in css?

Another way

body {_x000D_
    text-align: center;_x000D_
form {_x000D_
    display: inline-block;_x000D_
    <input type="text" value="abc">_x000D_

jQuery map vs. each

i understood it by this:

function fun1() {
    return this + 1;
function fun2(el) {
    return el + 1;

var item = [5,4,3,2,1];

var newitem1 = $.each(item, fun1);
var newitem2 = $.map(item, fun2);

console.log(newitem1); // [5, 4, 3, 2, 1] 
console.log(newitem2); // [6, 5, 4, 3, 2] 

so, "each" function returns the original array while "map" function returns a new array

How do I iterate over the words of a string?

#include <iostream>
#include <string>
#include <deque>

std::deque<std::string> split(
    const std::string& line, 
    std::string::value_type delimiter,
    bool skipEmpty = false
) {
    std::deque<std::string> parts{};

    if (!skipEmpty && !line.empty() && delimiter == {

    for (const std::string::value_type& c : line) {
        if (
                c == delimiter 
                (skipEmpty ? (!parts.empty() && !parts.back().empty()) : true)
            (c != delimiter && parts.empty())
        ) {

        if (c != delimiter) {

    if (skipEmpty && !parts.empty() && parts.back().empty()) {

    return parts;

void test(const std::string& line) {
    std::cout << line << std::endl;

    std::cout << "skipEmpty=0 |";
    for (const std::string& part : split(line, ':')) {
        std::cout << part << '|';
    std::cout << std::endl;

    std::cout << "skipEmpty=1 |";
    for (const std::string& part : split(line, ':', true)) {
        std::cout << part << '|';
    std::cout << std::endl;

    std::cout << std::endl;

int main() {

    return 0;


skipEmpty=0 |foo|bar|||baz|
skipEmpty=1 |foo|bar|baz|

skipEmpty=0 |
skipEmpty=1 |

skipEmpty=0 |foo|
skipEmpty=1 |foo|

skipEmpty=0 |||
skipEmpty=1 |

skipEmpty=0 ||||
skipEmpty=1 |

skipEmpty=0 ||foo|
skipEmpty=1 |foo|

skipEmpty=0 |||foo|
skipEmpty=1 |foo|

skipEmpty=0 ||foo||
skipEmpty=1 |foo|

skipEmpty=0 ||foo|||
skipEmpty=1 |foo|

php & mysql query not echoing in html with tags?

I can spot a few different problems with this. However, in the interest of time, try this chunk of code instead:

<?php require 'db.php'; ?>  <?php if (isset($_POST['search'])) {     $limit = $_POST['limit'];     $country = $_POST['country'];     $state = $_POST['state'];     $city = $_POST['city'];     $data = mysqli_query(         $link,         "SELECT * FROM proxies WHERE country = '{$country}' AND state = '{$state}' AND city = '{$city}' LIMIT {$limit}"     );     while ($assoc = mysqli_fetch_assoc($data)) {         $proxy = $assoc['proxy'];         ?>             <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"                 "">             <html xmlns="">                 <head>                     <title>Sock5Proxies</title>                     <meta http-equiv="Content-Type" content="text/html;charset=utf-8" />                     <link href="./style.css" rel="stylesheet" type="text/css" />                     <link href="./buttons.css" rel="stylesheet" type="text/css" />                 </head>                 <body>                     <center>                         <h1>Sock5Proxies</h1>                     </center>                     <div id="wrapper">                         <div id="header">                             <ul id="nav">                                 <li class="active"><a href="index.html"><span></span>Home</a></li>                                 <li><a href="leads.html"><span></span>Leads</a></li>                                 <li><a href="payout.php"><span></span>Pay out</a></li>                                 <li><a href="contact.html"><span></span>Contact</a></li>                                 <li><a href="logout.php"><span></span>Logout</a></li>                             </ul>                         </div>                         <div id="content">                             <div id="center">                                 <table cellpadding="0" cellspacing="0" style="width:690px">                                     <thead>                                     <tr>                                         <th width="75" class="first">Proxy</th>                                         <th width="50" class="last">Status</th>                                     </tr>                                     </thead>                                     <tbody>                                     <tr class="rowB">                                         <td class="first"> <?php echo $proxy ?> </td>                                         <td class="last">Check</td>                                     </tr>                                     </tbody>                                 </table>                             </div>                         </div>                         <div id="footer"></div>                         <span id="about">Version 1.0</span>                     </div>                 </body>             </html>         <?php     } } ?> <html> <form action="" method="POST">     <input type="text" name="limit" placeholder="10" /><br>     <input type="text" name="country" placeholder="Country" /><br>     <input type="text" name="state" placeholder="State" /><br>     <input type="text" name="city" placeholder="City" /><br>     <input type="submit" name="search" value="Search" /><br> </form> </html> 

How to get index in Handlebars each helper?

In handlebar version 3.0 onwards,

{{#each users as |user userId|}}
  Id: {{userId}} Name: {{}}

In this particular example, user will have the same value as the current context and userId will have the index value for the iteration. Refer - in block helpers section

Adding and using header (HTTP) in nginx

You can use upstream headers (named starting with $http_) and additional custom headers. For example:

add_header X-Upstream-01 $http_x_upstream_01;
add_header X-Hdr-01  txt01;

next, go to console and make request with user's header:

curl -H "X-Upstream-01: HEADER1" -I http://localhost:11443/

the response contains X-Hdr-01, seted by server and X-Upstream-01, seted by client:

HTTP/1.1 200 OK
Server: nginx/1.8.0
Date: Mon, 30 Nov 2015 23:54:30 GMT
Content-Type: text/html;charset=UTF-8
Connection: keep-alive
X-Hdr-01: txt01
X-Upstream-01: HEADER1

Edit line thickness of CSS 'underline' attribute

Here is one way of achieving this :


<h4>This is a heading</h4>

<h4><u>This is another heading</u></h4>

?CSS :

 u {
    text-decoration: none;
    border-bottom: 10px solid black;

Here is an example:

Restore a deleted file in the Visual Studio Code Recycle Bin

It uses the normal trash bin of your system. So you can grab it our of there.

In Windows you find it in the explorer, in Linux it is as well in Konquerer / Nemo / ...

What is the difference between the float and integer data type when the size is the same?

  • float stores floating-point values, that is, values that have potential decimal places
  • int only stores integral values, that is, whole numbers

So while both are 32 bits wide, their use (and representation) is quite different. You cannot store 3.141 in an integer, but you can in a float.

Dissecting them both a little further:

In an integer, all bits are used to store the number value. This is (in Java and many computers too) done in the so-called two's complement. This basically means that you can represent the values of −231 to 231 − 1.

In a float, those 32 bits are divided between three distinct parts: The sign bit, the exponent and the mantissa. They are laid out as follows:


There is a single bit that determines whether the number is negative or non-negative (zero is neither positive nor negative, but has the sign bit set to zero). Then there are eight bits of an exponent and 23 bits of mantissa. To get a useful number from that, (roughly) the following calculation is performed:

M × 2E

(There is more to it, but this should suffice for the purpose of this discussion)

The mantissa is in essence not much more than a 24-bit integer number. This gets multiplied by 2 to the power of the exponent part, which, roughly, is a number between −128 and 127.

Therefore you can accurately represent all numbers that would fit in a 24-bit integer but the numeric range is also much greater as larger exponents allow for larger values. For example, the maximum value for a float is around 3.4 × 1038 whereas int only allows values up to 2.1 × 109.

But that also means, since 32 bits only have 4.2 × 109 different states (which are all used to represent the values int can store), that at the larger end of float's numeric range the numbers are spaced wider apart (since there cannot be more unique float numbers than there are unique int numbers). You cannot represent some numbers exactly, then. For example, the number 2 × 1012 has a representation in float of 1,999,999,991,808. That might be close to 2,000,000,000,000 but it's not exact. Likewise, adding 1 to that number does not change it because 1 is too small to make a difference in the larger scales float is using there.

Similarly, you can also represent very small numbers (between 0 and 1) in a float but regardless of whether the numbers are very large or very small, float only has a precision of around 6 or 7 decimal digits. If you have large numbers those digits are at the start of the number (e.g. 4.51534 × 1035, which is nothing more than 451534 follows by 30 zeroes – and float cannot tell anything useful about whether those 30 digits are actually zeroes or something else), for very small numbers (e.g. 3.14159 × 10−27) they are at the far end of the number, way beyond the starting digits of 0.0000...

AndroidStudio: Failed to sync Install build tools

Go to File > Project Structure > Select Module > Properties you will landing to this screenenter image description here

Select Build Tools Version same as version selected in Compile Sdk Version.

Hope this will resolve your issue.

React-Router open Link in new tab

We can use the following options:-

 // first option is:-
    <Link to="myRoute" params={myParams} target="_blank">

 // second option is:-
    var href = this.props.history.createHref('myRoute', myParams);
    <a href={href} target="_blank">

 //third option is:-
    var href = '/myRoute/' + + '/' +;
    <a href={href} target="_blank">

We can use either of three option to open in new tab by react routing.

Get the records of last month in SQL server

select * from [member] where DatePart("m", date_created) = DatePart("m", DateAdd("m", -1, getdate())) AND DatePart("yyyy", date_created) = DatePart("yyyy", DateAdd("m", -1, getdate()))

How do I connect to a SQL Server 2008 database using JDBC?

I am also using mssql server 2008 and jtds.In my case I am using the following connect string and it works.

Class.forName( "net.sourceforge.jtds.jdbc.Driver" );
Connection con = DriverManager.getConnection( "jdbc:jtds:sqlserver://<your server ip     
address>:1433/zacmpf", userName, password );
Statement stmt = con.createStatement();

Where can I find the assembly System.Web.Extensions dll?

The assembly was introduced with .NET 3.5 and is in the GAC.

Simply add a .NET reference to your project.

Project -> Right Click References -> Select .NET tab -> System.Web.Extensions

If it is not there, you need to install .NET 3.5 or 4.0.

I have never set any passwords to my keystore and alias, so how are they created?

Signing in Debug Mode

The Android build tools provide a debug signing mode that makes it easier for you to develop and debug your application, while still meeting the Android system requirement for signing your APK. When using debug mode to build your app, the SDK tools invoke Keytool to automatically create a debug keystore and key. This debug key is then used to automatically sign the APK, so you do not need to sign the package with your own key.

The SDK tools create the debug keystore/key with predetermined names/passwords:

Keystore name: "debug.keystore"
Keystore password: "android"
Key alias: "androiddebugkey"
Key password: "android"
CN: "CN=Android Debug,O=Android,C=US"

If necessary, you can change the location/name of the debug keystore/key or supply a custom debug keystore/key to use. However, any custom debug keystore/key must use the same keystore/key names and passwords as the default debug key (as described above). (To do so in Eclipse/ADT, go to Windows > Preferences > Android > Build.)

Caution: You cannot release your application to the public when signed with the debug certificate.

Source: Developer.Android

Returning JSON from PHP to JavaScript?

Php has an inbuilt JSON Serialising function.



Please use that if you can and don't suffer Not Invented Here syndrome.

document.getElementById("test").style.display="hidden" not working

There are two ways of doing this.

Most of the answers have correctly pointed out that style.display has no value called "hidden". It should be none.

If you want to use "hidden" the syntax should be as follows."hidden"

The difference between the two is the visibility="hidden" property will only hide the contents of you element but retain it position on the page. Whereas the display ="none" will hide your complete element and the rest of the elements on the page will fill that void created by it.

Check this illustration

HTML Entity Decode

A more functional approach to @William Lahti's answer:

var entities = {
  'amp': '&',
  'apos': '\'',
  '#x27': '\'',
  '#x2F': '/',
  '#39': '\'',
  '#47': '/',
  'lt': '<',
  'gt': '>',
  'nbsp': ' ',
  'quot': '"'

function decodeHTMLEntities (text) {
  return text.replace(/&([^;]+);/gm, function (match, entity) {
    return entities[entity] || match

Wait until boolean value changes it state

You need a mechanism which avoids busy-waiting. The old wait/notify mechanism is fraught with pitfalls so prefer something from the java.util.concurrent library, for example the CountDownLatch:

public final CountDownLatch latch = new CountDownLatch(1);

public void run () {

And at the other side call


However, starting a thread to do nothing but wait until it is needed is still not the best way to go. You could also employ an ExecutorService to which you submit as a task the work which must be done when the condition is met.

Remove multiple objects with rm()

Another variation you can try is(expanding @mnel's answer) if you have many temp'x'.

here "n" could be the number of temp variables present

rm(list = c(paste("temp",c(1:n),sep="")))

How to import a JSON file in ECMAScript 6?

If you're using node you can:

const fs = require('fs');

const { config } = JSON.parse(fs.readFileSync('../config.json', 'utf8')) // May be incorrect, haven't used fs in a long time


const evaluation = require('../config.json');
// evaluation will then contain all props, so evaluation.config
// or you could use:
const { config } = require('../config.json');


// config.js
// json object here

// script.js

import { config } from '../config.js';


import * from '../config.json'

"date(): It is not safe to rely on the system's timezone settings..."

You probably need to put the timezone in a configuration line in your php.ini file. You should have a block like this in your php.ini file:

; Defines the default timezone used by the date functions
date.timezone = America/New_York

If not, add it (replacing the timezone by yours). After configuring, make sure to restart httpd (service httpd restart).

Here is the list of supported timezones.

How to justify navbar-nav in Bootstrap 3

Here is a more easy solution. just remove the "navbar-nav" class and add "nav-justified".

How to set a variable to be "Today's" date in Python/Pandas

Using pandas: pd.Timestamp("today").strftime("%m/%d/%Y")

How to store a large (10 digits) integer?

Use BigInt datatype with its implicit operations. The plus point for it is it will not give answers in exponential representation. It will give full length result

Here is an example of addition

      BigInteger big1 = new BigInteger("1234567856656567242177779");
      BigInteger big2 = new BigInteger("12345565678566567131275737372777569");
      BigInteger bigSum = big1.add(big2);
      System.out.println(bigSum );

How to declare and initialize a static const array as a class member?

// in foo.h
class Foo {
    static const unsigned char* Msg;

// in foo.cpp
static const unsigned char Foo_Msg_data[] = {0x00,0x01};
const unsigned char* Foo::Msg = Foo_Msg_data;

How to convert string to double with proper cultureinfo

You need to define a single locale that you will use for the data stored in the database, the invariant culture is there for exactly this purpose.

When you display convert to the native type and then format for the user's culture.

E.g. to display:

string fromDb = "123.56";
string display = double.Parse(fromDb, CultureInfo.InvariantCulture).ToString(userCulture);

to store:

string fromUser = "132,56";
double value;
// Probably want to use a more specific NumberStyles selection here.
if (!double.TryParse(fromUser, NumberStyles.Any, userCulture, out value)) {
  // Error...
string forDB = value.ToString(CultureInfo.InvariantCulture);

PS. It, almost, goes without saying that using a column with a datatype that matches the data would be even better (but sometimes legacy applies).

How to set image in imageview in android?

you can directly give the Image name in your setimage as iv.setImageResource(; that should be it.

Python - Join with newline

When you print it with this print 'I\nwould\nexpect\nmultiple\nlines' you would get:


The \n is a new line character specially used for marking END-OF-TEXT. It signifies the end of the line or text. This characteristics is shared by many languages like C, C++ etc.

How to read data from a zip file without having to unzip the entire file

Something like this will list and extract the files one by one, if you want to use SharpZipLib:

var zip = new ZipInputStream(File.OpenRead(@"C:\Users\Javi\Desktop\"));
var filestream = new FileStream(@"C:\Users\Javi\Desktop\", FileMode.Open, FileAccess.Read);
ZipFile zipfile = new ZipFile(filestream);
ZipEntry item;
while ((item = zip.GetNextEntry()) != null)
     using (StreamReader s = new StreamReader(zipfile.GetInputStream(item)))
      // stream with the file

Based on this example: content inside zip file

Cannot assign requested address - possible causes?

Okay, my problem wasn't the port, but the binding address. My server has an internal address ( and an external address (52.175.223.XX). When I tried connecting with:

$sock = @stream_socket_server('tcp://52.175.223.XX:123', $errNo, $errStr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN);

It failed because the local socket was and not the external 52.175.223.XX. You can checkout the local available interfaces with sudo ifconfig.

Windows task scheduler error 101 launch failure code 2147943785

The user that is configured to run this scheduled task must have "Log on as a batch job" rights on the computer that hosts the exe you are launching. This can be configured on the local security policy of the computer that hosts the exe. You can change the policy (on the server hosting the exe) under

Administrative Tools -> Local Security Policy -> Local Policies -> User Rights Assignment -> Log On As Batch Job

Add your user to this list (you could also make the user account a local admin on the machine hosting the exe).

Finally, you could also simply copy your exe from the network location to your local computer and run it from there instead.

Note also that a domain policy could be restricting "Log on as a batch job" rights at your organization.

How to implement endless list with RecyclerView?

Make these variables.

private int previousTotal = 0;
private boolean loading = true;
private int visibleThreshold = 5;
int firstVisibleItem, visibleItemCount, totalItemCount;

Set on Scroll for recycler view.

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {

    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        visibleItemCount = mRecyclerView.getChildCount();
        totalItemCount = mLayoutManager.getItemCount();
        firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();

        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false;
                previousTotal = totalItemCount;
        if (!loading && (totalItemCount - visibleItemCount) 
            <= (firstVisibleItem + visibleThreshold)) {
            // End has been reached

            Log.i("Yaeye!", "end called");

            // Do something

            loading = true;

Note : Make sure you are using LinearLayoutManager as layout manager for RecyclerView.

LinearLayoutManager mLayoutManager;
mLayoutManager = new LinearLayoutManager(this);

and for a grid

GridLayoutManager mLayoutManager;
mLayoutManager = new GridLayoutManager(getActivity(), spanCount);

Have fun with your endless scrolls !! ^.^

Update : mRecyclerView.setOnScrollListener() is deprecated just replace with mRecyclerView.addOnScrollListener() and the warning will be gone! You can read more from this SO question.

Since Android now officially support Kotlin, here is an update for the same -

Make OnScrollListener

class OnScrollListener(val layoutManager: LinearLayoutManager, val adapter: RecyclerView.Adapter<RecyclerAdapter.ViewHolder>, val dataList: MutableList<Int>) : RecyclerView.OnScrollListener() {
    var previousTotal = 0
    var loading = true
    val visibleThreshold = 10
    var firstVisibleItem = 0
    var visibleItemCount = 0
    var totalItemCount = 0

    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)

        visibleItemCount = recyclerView.childCount
        totalItemCount = layoutManager.itemCount
        firstVisibleItem = layoutManager.findFirstVisibleItemPosition()

        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false
                previousTotal = totalItemCount

        if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
            val initialSize = dataList.size
            val updatedSize = dataList.size
   { adapter.notifyItemRangeInserted(initialSize, updatedSize) }
            loading = true

and add it to your RecyclerView like this

recyclerView.addOnScrollListener(OnScrollListener(layoutManager, adapter, dataList))

For a full code example, feel free to refer this Github repo.

Java IOException "Too many open files"

On Linux and other UNIX / UNIX-like platforms, the OS places a limit on the number of open file descriptors that a process may have at any given time. In the old days, this limit used to be hardwired1, and relatively small. These days it is much larger (hundreds / thousands), and subject to a "soft" per-process configurable resource limit. (Look up the ulimit shell builtin ...)

Your Java application must be exceeding the per-process file descriptor limit.

You say that you have 19 files open, and that after a few hundred times you get an IOException saying "too many files open". Now this particular exception can ONLY happen when a new file descriptor is requested; i.e. when you are opening a file (or a pipe or a socket). You can verify this by printing the stacktrace for the IOException.

Unless your application is being run with a small resource limit (which seems unlikely), it follows that it must be repeatedly opening files / sockets / pipes, and failing to close them. Find out why that is happening and you should be able to figure out what to do about it.

FYI, the following pattern is a safe way to write to files that is guaranteed not to leak file descriptors.

Writer w = new FileWriter(...);
try {
    // write stuff to the file
} finally {
    try {
    } catch (IOException ex) {
        // Log error writing file and bail out.

1 - Hardwired, as in compiled into the kernel. Changing the number of available fd slots required a recompilation ... and could result in less memory being available for other things. In the days when Unix commonly ran on 16-bit machines, these things really mattered.


The Java 7 way is more concise:

try (Writer w = new FileWriter(...)) {
    // write stuff to the file
} // the `w` resource is automatically closed 


Apparently you can also encounter a "too many files open" while attempting to run an external program. The basic cause is as described above. However, the reason that you encounter this in exec(...) is that the JVM is attempting to create "pipe" file descriptors that will be connected to the external application's standard input / output / error.

How to save a Seaborn plot into a file

You would get an error for using sns.figure.savefig("output.png") in seaborn 0.8.1.

Instead use:

import seaborn as sns

df = sns.load_dataset('iris')
sns_plot = sns.pairplot(df, hue='species', size=2.5)

How to get the current working directory in Java?

What makes you think that c:\windows\system32 is not your current directory? The user.dir property is explicitly to be "User's current working directory".

To put it another way, unless you start Java from the command line, c:\windows\system32 probably is your CWD. That is, if you are double-clicking to start your program, the CWD is unlikely to be the directory that you are double clicking from.

Edit: It appears that this is only true for old windows and/or Java versions.

SQL Bulk Insert with FIRSTROW parameter skips the following line

You can use the below snippet

FROM 'E:\filefromabove.txt'
FIELDTERMINATOR = '|',  --CSV field delimiter
ROWTERMINATOR = '\n',   --Use to shift the control to next row
ERRORFILE = 'E:\ErrorRows.csv',

Fastest way to check a string contain another substring in JavaScript?

You have three possibilites:

  1. Regular expression:

     (new RegExp('word')).test(str)
     // or
  2. indexOf:

     str.indexOf('word') !== -1
  3. includes:


Regular expressions seem to be faster (at least in Chrome 10).

Performance test - short haystack
Performance test - long haystack

**Update 2011:**

It cannot be said with certainty which method is faster. The differences between the browsers is enormous. While in Chrome 10 indexOf seems to be faster, in Safari 5, indexOf is clearly slower than any other method.

You have to see and try for your self. It depends on your needs. For example a case-insensitive search is way faster with regular expressions.

Update 2018:

Just to save people from running the tests themselves, here are the current results for most common browsers, the percentages indicate performance increase over the next fastest result (which varies between browsers):

Chrome: indexOf (~98% faster) <-- wow
Firefox: cached RegExp (~18% faster)
IE11: cached RegExp(~10% faster)
Edge: indexOf (~18% faster)
Safari: cached RegExp(~0.4% faster)

Note that cached RegExp is: var r = new RegExp('simple'); var c = r.test(str); as opposed to: /simple/.test(str)

Dynamically display a CSV file as an HTML table on a web page

Here is a simple function to convert csv to html table using php:

function jj_readcsv($filename, $header=false) {
$handle = fopen($filename, "r");
echo '<table>';
//display header row if true
if ($header) {
    $csvcontents = fgetcsv($handle);
    echo '<tr>';
    foreach ($csvcontents as $headercolumn) {
        echo "<th>$headercolumn</th>";
    echo '</tr>';
// displaying contents
while ($csvcontents = fgetcsv($handle)) {
    echo '<tr>';
    foreach ($csvcontents as $column) {
        echo "<td>$column</td>";
    echo '</tr>';
echo '</table>';

One can call this function like jj_readcsv('image_links.csv',true);

if second parameter is true then the first row of csv will be taken as header/title.

Hope this helps somebody. Please comment for any flaws in this code.

PHP preg replace only allow numbers

You could also use T-Regx library:


T-Regx also:

  • Throws exceptions on fail (not false, null or warnings)
  • Has automatic delimiters (delimiters are not required!)
  • Has a lot cleaner api

use std::fill to populate vector with increasing numbers

You should use std::iota algorithm (defined in <numeric>):

  std::vector<int> ivec(100);
  std::iota(ivec.begin(), ivec.end(), 0); // ivec will become: [0..99]

Because std::fill just assigns the given fixed value to the elements in the given range [n1,n2). And std::iota fills the given range [n1, n2) with sequentially increasing values, starting with the initial value and then using ++value.You can also use std::generate as an alternative.

Don't forget that std::iota is C++11 STL algorithm. But a lot of modern compilers support it e.g. GCC, Clang and VS2012 :

P.S. This function is named after the integer function ? from the programming language APL, and signifies a Greek letter iota. I speculate that originally in APL this odd name was chosen because it resembles an “integer” (even though in mathematics iota is widely used to denote the imaginary part of a complex number).

How to rename HTML "browse" button of an input type=file?

A bit of JavaScript will take care of it:

<script language="JavaScript" type="text/javascript">
function HandleBrowseClick()
    var fileinput = document.getElementById("browse");;
    var textinput = document.getElementById("filename");
    textinput.value = fileinput.value;

<input type="file" id="browse" name="fileupload" style="display: none"/>
<input type="text" id="filename" readonly="true"/>
<input type="button" value="Click to select file" id="fakeBrowse" onclick="HandleBrowseClick();"/>

Not the nicest looking solution, but it works.

Scrolling to element using webdriver?


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

This one always works for me for any type of selectors. There is also the Actions class, but for this case, it is not so reliable.

How to get a particular date format ('dd-MMM-yyyy') in SELECT query SQL Server 2008 R2

Try this:

Declare @dt NVARCHAR(20)

    @dt = REPLACE(CONVERT(CHAR(15), SalesDate, 106),' ',' - ') 
FROM SalesTable

How can I use async/await at the top level?

Since main() runs asynchronously it returns a promise. You have to get the result in then() method. And because then() returns promise too, you have to call process.exit() to end the program.

      (text) => { console.log('outside: ' + text) },
      (err)  => { console.log(err) }
   .then(() => { process.exit() } )

How do you make div elements display inline?

I think you can use this way without using any css -


Right now you are using block level element that way you are getting unwanted result. So you can you inline element like span, small etc.


How to decode viewstate

As another person just mentioned, it's a base64 encoded string. In the past, I've used this website to decode it:

how to use free cloud database with android app?

As Wingman said, Google App Engine is a great solution for your scenario.

You can get some information about GAE+Android here:

And from this Google IO 2012 session:

How can I make my match non greedy in vim?

With \v (as suggested in several comments)


Show a leading zero if a number is less than 10

There's no built-in JavaScript function to do this, but you can write your own fairly easily:

function pad(n) {
    return (n < 10) ? ("0" + n) : n;


Meanwhile there is a native JS function that does that. See String#padStart

console.log(String(5).padStart(2, '0'));

input type=file show only button

That's going to be very hard. The problem with the file input type is that it usually consists of two visual elements, while being treated as a single DOM-element. Add to that that several browsers have their own distinct look and feel for the file input, and you're set for nightmare. See this article on about the quirks the file input has. I guarantee you it won't make you happy (I speak from experience).


Actually, I think you might get away with putting your input in a container element (like a div), and adding a negative margin to the element. Effectively hiding the textbox part off screen. Another option would be to use the technique in the article I linked, to try to style it like a button.

How to include (source) R script in other scripts

You could write a function that takes a filename and an environment name, checks to see if the file has been loaded into the environment and uses sys.source to source the file if not.

Here's a quick and untested function (improvements welcome!):

include <- function(file, env) {
  # ensure file and env are provided
  if(missing(file) || missing(env))
    stop("'file' and 'env' must be provided")
  # ensure env is character
  if(!is.character(file) || !is.character(env))
    stop("'file' and 'env' must be a character")

  # see if env is attached to the search path
  if(env %in% search()) {
    ENV <- get(env)
    files <- get(".files",ENV)
    # if the file hasn't been loaded
    if(!(file %in% files)) {
      sys.source(file, ENV)                        # load the file
      assign(".files", c(file, files), envir=ENV)  # set the flag
  } else {
    ENV <- attach(NULL, name=env)      # create/attach new environment
    sys.source(file, ENV)              # load the file
    assign(".files", file, envir=ENV)  # set the flag

Visual Studio keyboard shortcut to automatically add the needed 'using' statement

  • Context Menu key (one one with the menu on it, next to the right Windows key)
  • Then choose "Resolve" from the menu. That can be done by pressing "s".

Finding multiple occurrences of a string within a string in Python

FWIW, here are a couple of non-RE alternatives that I think are neater than poke's solution.

The first uses str.index and checks for ValueError:

def findall(sub, string):
    >>> text = "Allowed Hello Hollow"
    >>> tuple(findall('ll', text))
    (1, 10, 16)
    index = 0 - len(sub)
        while True:
            index = string.index(sub, index + len(sub))
            yield index
    except ValueError:

The second tests uses str.find and checks for the sentinel of -1 by using iter:

def findall_iter(sub, string):
    >>> text = "Allowed Hello Hollow"
    >>> tuple(findall_iter('ll', text))
    (1, 10, 16)
    def next_index(length):
        index = 0 - length
        while True:
            index = string.find(sub, index + length)
            yield index
    return iter(next_index(len(sub)).next, -1)

To apply any of these functions to a list, tuple or other iterable of strings, you can use a higher-level function —one that takes a function as one of its arguments— like this one:

def findall_each(findall, sub, strings):
    >>> texts = ("fail", "dolly the llama", "Hello", "Hollow", "not ok")
    >>> list(findall_each(findall, 'll', texts))
    [(), (2, 10), (2,), (2,), ()]
    >>> texts = ("parallellized", "illegally", "dillydallying", "hillbillies")
    >>> list(findall_each(findall_iter, 'll', texts))
    [(4, 7), (1, 6), (2, 7), (2, 6)]
    return (tuple(findall(sub, string)) for string in strings)

Loop through files in a folder using VBA?

Dir function loses focus easily when I handle and process files from other folders.

I've gotten better results with the component FileSystemObject.

Full example is given here:

Don't forget to set a reference in the Visual Basic Editor to Microsoft Scripting Runtime (by using Tools > References)

Give it a try!

How can I do GUI programming in C?

Use win APIs in your main function:

  1. RegisterClassEx() note: you have to provide a pointer to a function (usually called WndProc) which handles windows messages such as WM_CREATE, WM_COMMAND etc
  2. CreateWindowEx()
  3. ShowWindow()
  4. UpdateWindow()

Then write another function which handles win's messages (mentioned in #1). When you receive the message WM_CREATE you have to call CreateWindow(). The class is what control is that window, for example "edit" is a text box and "button" is a.. button :). You have to specify an ID for each control (of your choice but unique among all). CreateWindow() returns a handle to that control, which needs to be memorized. When the user clicks on a control you receive the WM_COMMAND message with the ID of that control. Here you can handle that event. You might find useful SetWindowText() and GetWindowText() which allows you to set/get the text of any control.
You will need only the win32 SDK. You can get it here.

OrderBy descending in Lambda expression?

Try this:

List<int> list = new List<int>();

foreach (var item in list.OrderByDescending(x => x))

Use of def, val, and var in scala

I'd start by the distinction that exists in Scala between def, val and var.

  • def - defines an immutable label for the right side content which is lazily evaluated - evaluate by name.

  • val - defines an immutable label for the right side content which is eagerly/immediately evaluated - evaluated by value.

  • var - defines a mutable variable, initially set to the evaluated right side content.

Example, def

scala> def something = 2 + 3 * 4 
something: Int
scala> something  // now it's evaluated, lazily upon usage
res30: Int = 14

Example, val

scala> val somethingelse = 2 + 3 * 5 // it's evaluated, eagerly upon definition
somethingelse: Int = 17

Example, var

scala> var aVariable = 2 * 3
aVariable: Int = 6

scala> aVariable = 5
aVariable: Int = 5

According to above, labels from def and val cannot be reassigned, and in case of any attempt an error like the below one will be raised:

scala> something = 5 * 6
<console>:8: error: value something_= is not a member of object $iw
       something = 5 * 6

When the class is defined like:

scala> class Person(val name: String, var age: Int)
defined class Person

and then instantiated with:

scala> def personA = new Person("Tim", 25)
personA: Person

an immutable label is created for that specific instance of Person (i.e. 'personA'). Whenever the mutable field 'age' needs to be modified, such attempt fails:

scala> personA.age = 44
personA.age: Int = 25

as expected, 'age' is part of a non-mutable label. The correct way to work on this consists in using a mutable variable, like in the following example:

scala> var personB = new Person("Matt", 36)
personB: Person = Person@59cd11fe

scala> personB.age = 44
personB.age: Int = 44    // value re-assigned, as expected

as clear, from the mutable variable reference (i.e. 'personB') it is possible to modify the class mutable field 'age'.

I would still stress the fact that everything comes from the above stated difference, that has to be clear in mind of any Scala programmer.

App.Config change value

Thanks Jahmic for the answer. Worked properly for me.

another useful code snippet that read the values and return a string:

public static string ReadSetting(string key)
        System.Configuration.Configuration cfg = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
        System.Configuration.AppSettingsSection appSettings = (System.Configuration.AppSettingsSection)cfg.GetSection("appSettings");
        return appSettings.Settings[key].Value;


Getting "Skipping JaCoCo execution due to missing execution data file" upon executing JaCoCo

Try to use:

mvn jacoco:report -debug

to see the details about your reporting process.

I configured my jacoco like this:


Then mvn jacoco:report -debug shows it using the default configuration, which means jacoco.exec is not in ~/jacoco.exec. The error says missing execution data file.

So just use the default configuration:


And everything works fine.

How to count lines of Java code using IntelliJ IDEA?

Although it is not an IntelliJ option, you could use a simple Bash command (if your operating system is Linux/Unix). Go to your source directory and type:

find . -type f -name '*.java' | xargs cat | wc -l

How can I remove the first line of a text file using bash/sed script?

Would using tail on N-1 lines and directing that into a file, followed by removing the old file, and renaming the new file to the old name do the job?

If i were doing this programatically, i would read through the file, and remember the file offset, after reading each line, so i could seek back to that position to read the file with one less line in it.

How to use 'find' to search for files created on a specific date?

You can't. The -c switch tells you when the permissions were last changed, -a tests the most recent access time, and -m tests the modification time. The filesystem used by most flavors of Linux (ext3) doesn't support a "creation time" record. Sorry!

best practice to generate random token for forgot password

You can also use DEV_RANDOM, where 128 = 1/2 the generated token length. Code below generates 256 token.

$token = bin2hex(mcrypt_create_iv(128, MCRYPT_DEV_RANDOM));

Android Bitmap to Base64 String

use following method to convert bitmap to byte array:

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();  
bitmap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream .toByteArray();

to encode base64 from byte array use following method

String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);

How To Accept a File POST

I'm surprised that a lot of you seem to want to save files on the server. Solution to keep everything in memory is as follows:

public async Task<IHttpActionResult> Upload()
    if (!Request.Content.IsMimeMultipartContent())
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); 

    var provider = new MultipartMemoryStreamProvider();
    await Request.Content.ReadAsMultipartAsync(provider);
    foreach (var file in provider.Contents)
        var filename = file.Headers.ContentDisposition.FileName.Trim('\"');
        var buffer = await file.ReadAsByteArrayAsync();
        //Do whatever you want with filename and its binary data.

    return Ok();

'True' and 'False' in Python

is compares identity. A string will never be identical to a not-string.

== is equality. But a string will never be equal to either True or False.

You want neither.

path = '/bla/bla/bla'

if path:
    print "True"
    print "False"

List of standard lengths for database fields

I would say to err on the high side. Since you'll probably be using varchar, any extra space you allow won't actually use up any extra space unless somebody needs it. I would say for names (first or last), go at least 50 chars, and for email address, make it at least 128. There are some really long email addresses out there.

Another thing I like to do is go to and ask it to generate some text. That way you can get a good idea of just what 100 bytes looks like.

How to get the nvidia driver version from the command line?

On any linux system with the NVIDIA driver installed and loaded into the kernel, you can execute:

cat /proc/driver/nvidia/version

to get the version of the currently loaded NVIDIA kernel module, for example:

$ cat /proc/driver/nvidia/version 
NVRM version: NVIDIA UNIX x86_64 Kernel Module  304.54  Sat Sep 29 00:05:49 PDT 2012
GCC version:  gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) 

Can't access object property, even though it shows up in a console log

In my case I was passing an object to a promise, within the promise I was adding more key/values to the object and when it was done the promise returned the object.

However, a slight over look on my part, the promise was returning the object before it was fully finished...thus the rest of my code was trying to process the updated object and the data wasn't yet there. But like above, in the console, I saw the object fully updated but wasn't able to access the keys - they were coming back undefined. Until I saw this:

console.log(obj) ;
console.log(obj.newKey1) ;

// returned in console
> Object { origKey1: "blah", origKey2: "blah blah"} [i]
    origKey1: "blah"
    origKey2: "blah blah"
    newKey1: "this info"
    newKey2: "that info"
    newKey3: " more info"
> *undefined*

The [i] is a little icon, when I hovered over it it said Object value at left was snapshotted when logged, value below was evaluated just now. Thats when it occurred to me that my object was being evaluated before the promise had fully updated it.

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

I would like to mention what is explained in Java Concurrency in Practice:

First point, whether Notify or NotifyAll?

It will be NotifyAll, and reason is that it will save from signall hijacking.

If two threads A and B are waiting on different condition predicates of same condition queue and notify is called, then it is upto JVM to which thread JVM will notify.

Now if notify was meant for thread A and JVM notified thread B, then thread B will wake up and see that this notification is not useful so it will wait again. And Thread A will never come to know about this missed signal and someone hijacked it's notification.

So, calling notifyAll will resolve this issue, but again it will have performance impact as it will notify all threads and all threads will compete for same lock and it will involve context switch and hence load on CPU. But we should care about performance only if it is behaving correctly, if it's behavior itself is not correct then performance is of no use.

This problem can be solved with using Condition object of explicit locking Lock, provided in jdk 5, as it provides different wait for each condition predicate. Here it will behave correctly and there will not be performance issue as it will call signal and make sure that only one thread is waiting for that condition

Excel - Combine multiple columns into one column

I created an example spreadsheet here of how to do this with simple Excel formulae, and without use of macros (you will need to make your own adjustments for getting rid of the first row, but this should be easy once you figure out how my example spreadsheet works):

get next sequence value from database using hibernate

Interesting it works for you. When I tried your solution an error came up, saying that "Type mismatch: cannot convert from SQLQuery to Query". --> Therefore my solution looks like:

SQLQuery query = session.createSQLQuery("select nextval('SEQUENCE_NAME')");
Long nextValue = ((BigInteger)query.uniqueResult()).longValue();

With that solution I didn't run into performance problems.

And don't forget to reset your value, if you just wanted to know for information purposes.

    query = session.createSQLQuery("select setval('SEQUENCE_NAME'," + nextValue + ")");

How to copy a selection to the OS X clipboard

I meet the same issue, after install macvim still not working, finally I found a way to solve:

Try to uninstall all vim first,

brew uninstall macvim

brew uninstall --force vim

and reinstall macvim

brew install macvim --with-override-system-vim

Then you can use "*y or "+y, don't have to set clipboard=unnamed

How to print GETDATE() in SQL Server with milliseconds in time?

First, you should probably use SYSDATETIME() if you're looking for more precision.

To format your data with milliseconds, try CONVERT(varchar, SYSDATETIME(), 121).

For other formats, check out the MSDN page on CAST and CONVERT.

When should you use a class vs a struct in C++?

The differences between a class and a struct in C++ is:

  • struct members and base classes/structs are public by default.
  • class members and base classes/struts are private by default.

Both classes and structs can have a mixture of public, protected and private members, can use inheritance and can have member functions.

I would recommend you:

  • use struct for plain-old-data structures without any class-like features;
  • use class when you make use of features such as private or protected members, non-default constructors and operators, etc.

Oracle insert from select into table with more columns

Put 0 as default in SQL or add 0 into your area of table

C - split string into an array of strings

Since you've already looked into strtok just continue down the same path and split your string using space (' ') as a delimiter, then use something as realloc to increase the size of the array containing the elements to be passed to execvp.

See the below example, but keep in mind that strtok will modify the string passed to it. If you don't want this to happen you are required to make a copy of the original string, using strcpy or similar function.

char    str[]= "ls -l";
char ** res  = NULL;
char *  p    = strtok (str, " ");
int n_spaces = 0, i;

/* split string and append tokens to 'res' */

while (p) {
  res = realloc (res, sizeof (char*) * ++n_spaces);

  if (res == NULL)
    exit (-1); /* memory allocation failed */

  res[n_spaces-1] = p;

  p = strtok (NULL, " ");

/* realloc one extra element for the last NULL */

res = realloc (res, sizeof (char*) * (n_spaces+1));
res[n_spaces] = 0;

/* print the result */

for (i = 0; i < (n_spaces+1); ++i)
  printf ("res[%d] = %s\n", i, res[i]);

/* free the memory allocated */

free (res);

res[0] = ls
res[1] = -l
res[2] = (null)

Check input value length

<input type='text' minlength=3 /><br />

if browser supports html5,

it will automatical be validate attributes(minlength) in tag

but Safari(iOS) doesn't working

How can I get a list of all values in select box?





Link to fiddle

And I agree with Abraham - you might want to use text instead of value

The reason your fiddle didn't work was because you chose the option: "onLoad" instead of: "No wrap - in "

C# - Insert a variable number of spaces into a string? (Formatting an output file)

Use String.Format:

string title1 = "Sample Title One";
string element1 = "Element One";
string format = "{0,-20} {1,-10}";

string result = string.Format(format, title1, element1);
//or you can print to Console directly with
//Console.WriteLine(format, title1, element1);

In the format {0,-20} means the first argument has a fixed length 20, and the negative sign guarantees the string is printed from left to right.

Encoding Error in Panda read_csv

This works in Mac as well you can use

df= pd.read_csv('Region_count.csv', encoding ='latin1')

How do I get the function name inside a function in PHP?

If you are using PHP 5 you can try this:

function a() {
    $trace = debug_backtrace();
    echo $trace[0]["function"];

Stop Visual Studio from mixing line endings in files

see and

  1. If it does not exist, add a new file called .editorconfig for your project

  2. manipulate editor config to use your preferred behaviour.

I prefer spaces over tabs, and CRLF for all code files.
Here's my .editorconfig

root = true

indent_style = space
indent_size = 4
end_of_line = crlf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

trim_trailing_whitespace = false

indent_size = 4

indent_size = 2 

Getter and Setter of Model object in Angular 4

The way you declare the date property as an input looks incorrect but its hard to say if it's the only problem without seeing all your code. Rather than using @Input('date') declare the date property like so: private _date: string;. Also, make sure you are instantiating the model with the new keyword. Lastly, access the property using regular dot notation.

Check your work against this example from :

let passcode = "secret passcode";

class Employee {
    private _fullName: string;

    get fullName(): string {
        return this._fullName;

    set fullName(newName: string) {
        if (passcode && passcode == "secret passcode") {
            this._fullName = newName;
        else {
            console.log("Error: Unauthorized update of employee!");

let employee = new Employee();
employee.fullName = "Bob Smith";
if (employee.fullName) {

And here is a plunker demonstrating what it sounds like you're trying to do:

How can I show/hide a specific alert with twitter bootstrap?

On top of all the previous answers, dont forget to hide your alert before using it with a simple style="display:none;"

<div class="alert alert-success" id="passwordsNoMatchRegister" role="alert" style="display:none;" >Message of the Alert</div>

Then use either:




How to get a pixel's x,y coordinate color from an image?

With : i << 2

const data = context.getImageData(x, y, width, height).data;
const pixels = [];

for (let i = 0, dx = 0; dx < data.length; i++, dx = i << 2) {
    if (data[dx+3] <= 8)
        console.log("transparent x= " + i);

Changing Vim indentation behavior by file type

For those using autocmd, it is a best practice to group those together. If a grouping is related to file-type detection, you might have something like this:

augroup filetype_c
    :autocmd FileType c setlocal tabstop=2 shiftwidth=2 softtabstop=2 expandtab
    :autocmd FileType c nnoremap <buffer> <localleader>c I/*<space><esc><s-a><space>*/<esc>
augroup end

Groupings help keep the .vimrc organized especially once a filetype has multiple rules associated with it. In the above example, a comment shortcut specific to .c files is defined.

The initial call to autocmd! tells vim to delete any previously defined autocommands in said grouping. This will prevent duplicate definition if .vimrc is sourced again. See the :help augroup for more info.

Set Focus on EditText

This changes the focus of the EditText when the button is clicked:

public class MainActivity extends Activity {
    private EditText e1,e2;
    private Button b1,b2;

    protected void onCreate(Bundle savedInstanceState) {
        e1=(EditText) findViewById(;
        e2=(EditText) findViewById(;
        b1=(Button) findViewById(;
        b2=(Button) findViewById(;
        b1.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

        b2.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

Representing null in JSON

This is a personal and situational choice. The important thing to remember is that the empty string and the number zero are conceptually distinct from null.

In the case of a count you probably always want some valid number (unless the count is unknown or undefined), but in the case of strings, who knows? The empty string could mean something in your application. Or maybe it doesn't. That's up to you to decide.

Replace Default Null Values Returned From Left Outer Join

In case of MySQL or SQLite the correct keyword is IFNULL (not ISNULL).

 SELECT iar.Description, 
      IFNULL(iai.Quantity,0) as Quantity, 
      IFNULL(iai.Quantity * rpl.RegularPrice,0) as 'Retail', 
    FROM InventoryAdjustmentReason iar
    LEFT OUTER JOIN InventoryAdjustmentItem iai  on (iar.Id = iai.InventoryAdjustmentReasonId)
    LEFT OUTER JOIN Item i on (i.Id = iai.ItemId)
    LEFT OUTER JOIN ReportPriceLookup rpl on (rpl.SkuNumber = i.SkuNo)
WHERE iar.StoreUse = 'yes'

How to get the selected item of a combo box to a string variable in c#

You can use as below:

string selected = cmbbox.Text;

Tuples( or arrays ) as Dictionary keys in C#

If your consuming code can make do with an IDictionary<> interface, instead of Dictionary, my instinct would have been to use a SortedDictionary<> with a custom array comparer, ie:

class ArrayComparer<T> : IComparer<IList<T>>
    where T : IComparable<T>
    public int Compare(IList<T> x, IList<T> y)
        int compare = 0;
        for (int n = 0; n < x.Count && n < y.Count; ++n)
            compare = x[n].CompareTo(y[n]);
        return compare;

And create thus (using int[] just for concrete example's sake):

var dictionary = new SortedDictionary<int[], string>(new ArrayComparer<int>());

How to generate and manually insert a uniqueidentifier in sql server?

ApplicationId must be of type UniqueIdentifier. Your code works fine if you do:





Therefore I would say it is safe to assume that ApplicationId is not the correct data type.

Getting user input

Use the following simple way to interactively get user data by a prompt as Arguments on what you want.

Version : Python 3.X

name = input('Enter Your Name: ')
print('Hello ', name)

AngularJS: ng-repeat list is not updated when a model element is spliced from the model array

I had the same issue. The problem was because 'ng-controller' was defined twice (in routing and also in the HTML).

How to remove all white space from the beginning or end of a string?

take a look at Trim() which returns a new string with whitespace removed from the beginning and end of the string it is called on.

Array.size() vs Array.length

The .size() function is available in Jquery and many other libraries.

The .length property works only when the index is an integer.

The length property will work with this type of array:

var nums = new Array();
nums[0] = 1; 
nums[1] = 2;
print(nums.length); // displays 2

The length property won't work with this type of array:

var pbook = new Array(); 
pbook["David"] = 1; 
pbook["Jennifer"] = 2;
print(pbook.length); // displays 0

So in your case you should be using the .length property.

What does "export default" do in JSX?

Simplest Understanding for default export is

Export is ES6's feature which is used to Export a module(file) and use it in some other module(file).

Default Export:

  1. default export is the convention if you want to export only one object(variable, function, class) from the file(module).
  2. There could be only one default export per file, but not restricted to only one export.
  3. When importing default exported object we can rename it as well.

Export or Named Export:

  1. It is used to export the object(variable, function, calss) with the same name.

  2. It is used to export multiple objects from one file.

  3. It cannot be renamed when importing in another file, it must have the same name that was used to export it, but we can create its alias by using as operator.

In React, Vue and many other frameworks the Export is mostly used to export reusable components to make modular based applications.

What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL?

When it gets to real world usage of these datatypes, it is very important that you understand that using certain integer types could just be an overkill or under used. For example, using integer datatype for employeeCount in a table say employee could be an overkill since it supports a range of integer values from ~ negative 2 billion to positive 2 billion or zero to approximately 4 billion (unsigned). So, even if you consider one of the US biggest employer such as Walmart with roughly about 2.2 million employees using an integer datatype for the employeeCount column would be unnecessary. In such a case you use mediumint (that supports from 0 to 16 million (unsigned)) for example. Having said that if your range is expected to be unusually large you might consider bigint which as you can see from Daniel's notes supports a range larger than I care to decipher.

how to get the base url in javascript

One way is to use a script tag to import the variables you want to your views:

<script type="text/javascript">
window.base_url = <?php echo json_encode(base_url()); ?>;

Here, I wrapped the base_url with json_encode so that it'll automatically escape any characters to valid Javascript. I put base_url to the global Window so you can use it anywhere just by calling base_url, but make sure to put the script tag above any Javascript that calls it. With your given example:

$('#style_color').attr("href", base_url + "assets/css/themes/" + color_ + ".css");

Rendering HTML inside textarea

This is not possible to do with a textarea. What you are looking for is an content editable div, which is very easily done:

<div contenteditable="true"></div>


div.editable {_x000D_
    width: 300px;_x000D_
    height: 200px;_x000D_
    border: 1px solid #ccc;_x000D_
    padding: 5px;_x000D_
strong {_x000D_
  font-weight: bold;_x000D_
<div contenteditable="true">This is the first line.<br>_x000D_
See, how the text fits here, also if<br>there is a <strong>linebreak</strong> at the end?_x000D_
<br>It works nicely._x000D_
<br><span style="color: lightgreen">Great</span>._x000D_

How to set user environment variables in Windows Server 2008 R2 as a normal user?

Under "Start" enter "environment" in the search field. That will list the option to change the system variables directly in the start menu.

Sending images using Http Post

I usually do this in the thread handling the json response:

try {
  Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(imageUrl).getContent());
} catch (MalformedURLException e) {
} catch (IOException e) {

If you need to do transformations on the image, you'll want to create a Drawable instead of a Bitmap.

Getting the object's property name

To get the property of the object or the "array key" or "array index" depending on what your native language is..... Use the Object.keys() method.

Important, this is only compatible with "Modern browsers":

So if your object is called, myObject...

var c = 0;
for(c in myObject) {

Walla! This will definitely work in the latest firefox and ie11 and chrome...

Here is some documentation at MDN

What does -> mean in C++?

  1. Access operator applicable to (a) all pointer types, (b) all types which explicitely overload this operator
  2. Introducer for the return type of a local lambda expression:

    std::vector<MyType> seq;
    // fill with instances...  
    std::sort(seq.begin(), seq.end(),
                [] (const MyType& a, const MyType& b) -> bool {
                    return a.Content < b.Content;
  3. introducing a trailing return type of a function in combination of the re-invented auto:

    struct MyType {
        // declares a member function returning std::string
        auto foo(int) -> std::string;

Maven2 property that indicates the parent directory

So the problem as I see it is that you can't get the absolute path to a parent directory in maven.

<rant> I've heard this talked about as an anti-pattern, but for every anti-pattern there is real, legitimate use case for it, and I'm sick of maven telling me I can only follow their patterns.</rant>

So the work around I found was to use antrun. Try this in the child pom.xml:

                    <!--Adjust the location below to your directory structure -->
                    <property name="main.basedir" location="./.." />
                    <echo message="main.basedir=${main.basedir}"/>

If you run mvn verify you should see something like this:

     [echo] main.basedir=C:\src\

You can then use ${main.basedir} in any of the other plugins, etc. Took me a while to figure this out, so hope it helps someone else.

how to use font awesome in own css?

The spirit of Web font is to use cache as much as possible, therefore you should use CDN version between <head></head> instead of hosting yourself:

<link href="//" rel="stylesheet">

Also, make sure you loaded your CSS AFTER the above line, or your custom font CSS won't work.

Reference: Font Awesome Get Started

Is there a way to iterate over a dictionary?

Yes, NSDictionary supports fast enumeration. With Objective-C 2.0, you can do this:

// To print out all key-value pairs in the NSDictionary myDict
for(id key in myDict)
    NSLog(@"key=%@ value=%@", key, [myDict objectForKey:key]);

The alternate method (which you have to use if you're targeting Mac OS X pre-10.5, but you can still use on 10.5 and iPhone) is to use an NSEnumerator:

NSEnumerator *enumerator = [myDict keyEnumerator];
id key;
// extra parens to suppress warning about using = instead of ==
while((key = [enumerator nextObject]))
    NSLog(@"key=%@ value=%@", key, [myDict objectForKey:key]);

How to solve "The directory is not empty" error when running rmdir command in a batch script?

What worked for me is the following. I appears like the RMDir command will issue “The directory is not empty” nearly all the time...


Erase /F /S /Q C:\MyDir

RMDir /S /Q C:\MyDir
If  Exist  C:\MyDir  GoTo Cleanup_Temporary_Files_and_Folders

Can I apply multiple background colors with CSS3?

In this LIVE DEMO i've achieved this by using the :before css selector which seems to work quite nicely.

.myDiv  {_x000D_
position: relative; /*Parent MUST be relative*/_x000D_
z-index: 9;_x000D_
background: green;_x000D_
/*Set width/height of the div in 'parent'*/    _x000D_
.myDiv:before {_x000D_
content: "";_x000D_
position: absolute;/*set 'child' to be absolute*/_x000D_
z-index: -1; /*Make this lower so text appears in front*/_x000D_
/*You can choose to align it left, right, top or bottom here*/_x000D_
top: 0; _x000D_
bottom: 60%;_x000D_
left: 0;_x000D_
background: red;_x000D_
<div class="myDiv">this is my div with multiple colours. It work's with text too!</div>

I thought i would add this as I feel it could work quite well for a percentage bar/visual level of something.

It also means you're not creating multiple divs if you don't have to, and keeps this page up-to-date

Check key exist in python dict

Use the in keyword.

if 'apples' in d:
    if d['apples'] == 20:
        print('20 apples')
        print('Not 20 apples')

If you want to get the value only if the key exists (and avoid an exception trying to get it if it doesn't), then you can use the get function from a dictionary, passing an optional default value as the second argument (if you don't pass it it returns None instead):

if d.get('apples', 0) == 20:
    print('20 apples.')
    print('Not 20 apples.')

Send array with Ajax to PHP script

dataString suggests the data is formatted in a string (and maybe delimted by a character).

$data = explode(",", $_POST['data']);
foreach($data as $d){
     echo $d;

if dataString is not a string but infact an array (what your question indicates) use JSON.

Getting a browser's name client-side

It's all about what you really want to do, but in times to come and right now, the best way is avoid browser detection and check for features. like Canvas, Audio, WebSockets, etc through simple javascript calls or in your CSS, for me your best approach is use a tool like ModernizR:

Unlike with the traditional—but highly unreliable—method of doing “UA sniffing,” which is detecting a browser by its (user-configurable) navigator.userAgent property, Modernizr does actual feature detection to reliably discern what the various browsers can and cannot do.

If using CSS, you can do this:

.no-js .glossy,
.no-cssgradients .glossy {
    background: url("images/glossybutton.png");

.cssgradients .glossy {
    background-image: linear-gradient(top, #555, #333);

as it will load and append all features as a class name in the <html> element and you will be able to do as you wish in terms of CSS.

And you can even load files upon features, for example, load a polyfill js and css if the browser does not have native support

  // Presentational polyfills
    // Logical list of things we would normally need
    test : Modernizr.fontface && Modernizr.canvas && Modernizr.cssgradients,
    // Modernizr.load loads css and javascript by default
    nope : ['presentational-polyfill.js', 'presentational.css']
  // Functional polyfills
    // This just has to be truthy
    test : Modernizr.websockets && window.JSON,
    // socket-io.js and json2.js
    nope : 'functional-polyfills.js',
    // You can also give arrays of resources to load.
    both : [ 'app.js', 'extra.js' ],
    complete : function () {
      // Run this after everything in this group has downloaded
      // and executed, as well everything in all previous groups
  // Run your analytics after you've already kicked off all the rest
  // of your app.

a simple example of requesting features from javascript:

Gulp command not found after install

I realize that this is an old thread, but for Future-Me, and posterity, I figured I should add my two-cents around the "running npm as sudo" discussion. Disclaimer: I do not use Windows. These steps have only been proven on non-windows machines, both virtual and physical.

You can avoid the need to use sudo by changing the permission to npm's default directory.

How to: change permissions in order to run npm without sudo

Step 1: Find out where npm's default directory is.

  • To do this, open your terminal and run:
    npm config get prefix

Step 2: Proceed, based on the output of that command:

  • Scenario One: npm's default directory is /usr/local
    For most users, your output will show that npm's default directory is /usr/local, in which case you can skip to step 4 to update the permissions for the directory.
  • Scenario Two: npm's default directory is /usr or /Users/YOURUSERNAME/node_modules or /Something/Else/FishyLooking
    If you find that npm's default directory is not /usr/local, but is instead something you can't explain or looks fishy, you should go to step 3 to change the default directory for npm, or you risk messing up your permissions on a much larger scale.

Step 3: Change npm's default directory:

  • There are a couple of ways to go about this, including creating a directory specifically for global installations and then adding that directory to your $PATH, but since /usr/local is probably already in your path, I think it's simpler to just change npm's default directory to that. Like so: npm config set prefix /usr/local
    • For more info on the other approaches I mentioned, see the npm docs here.

Step 4: Update the permissions on npm's default directory:

  • Once you've verified that npm's default directory is in a sensible location, you can update the permissions on it using the command:
    sudo chown -R $(whoami) $(npm config get prefix)/{lib/node_modules,bin,share}

Now you should be able to run npm <whatever> without sudo. Note: You may need to restart your terminal in order for these changes to take effect.

Git error: "Please make sure you have the correct access rights and the repository exists"

  1. The first thing you may want to confirm is the internet connection. Though, internet issues mostly will say that the repo cannot be accessed.

  2. Ensure you have set up ssh both locally and on your github. See how

  3. Ensure you are using the ssh git remote. If you had cloned the https, just set the url to the ssh url, with this git command git remote set-url origin [email protected]:your-username/your-repo-name.git

  4. If you have set up ssh properly but it just stopped working, do the following:

    • eval "$(ssh-agent -s)"
    • ssh-add

    If you are still having the issue, check to ensure that you have not deleted the ssh from your github. In a case where the ssh has been deleted from github, you can add it back. Use pbcopy < ~/.ssh/ to copy the ssh key and then go to your github ssh setting and add it.

I will recommend you always use ssh. For most teams I've worked with, you can't access the repo (which are mostly private) except you use ssh. For a beginner, it may appear to be harder but later you'll find it quite easier and more secured.

In Python, how do you convert a `datetime` object to seconds?

To get the Unix time (seconds since January 1, 1970):

>>> import datetime, time
>>> t = datetime.datetime(2011, 10, 21, 0, 0)
>>> time.mktime(t.timetuple())

Merge two rows in SQL

if one row has value in field1 column and other rows have null value then this Query might work.

  MAX(Field1) as Field1,
  MAX(Field2) as Field2
select FK,ISNULL(Field1,'') as Field1,ISNULL(Field2,'') as Field2 from table1

Uncaught TypeError: Cannot read property 'toLowerCase' of undefined

your $(this).val() has no scope in your ajax call, because its not in change event function scope

May be you implemented that ajax call in your change event itself first, in that case it works fine. but when u created a function and calling that funciton in change event, scope for $(this).val() is not valid.

simply get the value using id selector instead of


whole code should be like this:

 $(document).ready(function () 

function loadTeachers()
    $.ajax({ type:'GET', url:'/Manage/getTeachers/' + $(#CourseSelect).val(), dataType:'json', cache:false,
            $('#TeacherSelect').get(0).options.length = 0;    

            $.each(data, function(i, teacher) 
                var option = $('<option />');
        }, error:function(){ alert("Error while getting results"); }

source of historical stock data

NASDAQ offers 10 years of historical EOD data for each symbol

You could automate the process of downloading this data.

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

Reload the current page:

Reload the current page, ignoring cached content (i.e. JavaScript files, images, etc.):

Is it possible to specify the schema when connecting to postgres with JDBC?

If it is possible in your environment, you could also set the user's default schema to your desired schema:

ALTER USER user_name SET search_path to 'schema'

CodeIgniter: How to use WHERE clause and OR clause

$where = "name='Joe' AND status='boss' OR status='active'";


Though I am 3/4 of a month late, you still execute the following after your where clauses are defined... $this->db->get("tbl_name");

Jquery/Ajax Form Submission (enctype="multipart/form-data" ). Why does 'contentType:False' cause undefined index in PHP?

Please set your form action attribute as below it will solve your problem.

<form name="addProductForm" id="addProductForm" action="javascript:;" enctype="multipart/form-data" method="post" accept-charset="utf-8">

jQuery code:

$(document).ready(function () {
    $("#addProductForm").submit(function (event) {

        //disable the default form submission
        //grab all form data  
        var formData = $(this).serialize();

            url: 'addProduct.php',
            type: 'POST',
            data: formData,
            async: false,
            cache: false,
            contentType: false,
            processData: false,
            success: function () {
                alert('Form Submitted!');
            error: function(){
                alert("error in ajax form submission");

        return false;

SQLRecoverableException: I/O Exception: Connection reset

I want to produce a complementary answer of nacho-soriano's solution ...

I recently search to solve a problem where a Java written application (a Talend ELT job in fact) want to connect to an Oracle database (11g and over) then randomly fail. OS is both RedHat Enterprise and CentOS. Job run very quily in time (no more than half a minute) and occur very often (approximately one run each 5 minutes).

Some times, during night-time as work-time, during database intensive-work usage as lazy work usage, in just a word randomly, connection fail with this message:

Exception in component tOracleConnection_1
java.sql.SQLRecoverableException: Io exception: Connection reset
        at oracle.jdbc.driver.SQLStateMapping.newSQLException(
        at oracle.jdbc.driver.DatabaseError.newSQLException(
        at oracle.jdbc.driver.DatabaseError.throwSqlException(
        at oracle.jdbc.driver.DatabaseError.throwSqlException(
        at oracle.jdbc.driver.DatabaseError.throwSqlException(
        at oracle.jdbc.driver.T4CConnection.logon(
        at oracle.jdbc.driver.PhysicalConnection.<init>(
        at oracle.jdbc.driver.T4CConnection.<init>(
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(
        at oracle.jdbc.driver.OracleDriver.connect(
        at java.sql.DriverManager.getConnection(
        at java.sql.DriverManager.getConnection(
    and StackTrace follow ...

Problem explanation:

As detailed here

Oracle connection needs some random numbers to assume a good level of security. Linux random number generator produce some numbers bases keyboard and mouse activity (among others) and place them in a stack. You will grant me, on a server, there is not a big amount of such activity. So it can occur that softwares use more random number than generator can produce.

When the pool is empty, reads from /dev/random will block until additional environmental noise is gathered. And Oracle connection fall in timeout (60 seconds by default).

Solution 1 - Specific for one app solution

The solution is to give add two parameters given to the JVM while starting:

Note: the '/./' is important, do not drop it !

So the launch command line could be:

java -Dsecurerandom.source=file:/dev/./urandom -cp <classpath directives> appMainClass <app options and parameters>

One drawback of this solution is that numbers generated are a little less secure as randomness is impacted. If you don't work in a military or secret related industry this solution can be your.

Solution 2 - General Java JVM solution

As explained here

Both directives given in solution 1 can be put in Java security setting file.

Take a look at $JAVA_HOME/jre/lib/security/

Change the line




Change is effective immediately for new running applications.

As for solution #1, one drawback of this solution is that numbers generated are a little less secure as randomness is impacted. This time, it's a global JVM impact. As for solution #1, if you don't work in a military or secret related industry this solution can be your.

We ideally should use "file:/dev/./urandom" after Java 5 as previous path will again point to /dev/random.

Reported Bug :

Solution 3 - Hardware solution

Disclamer: I'm not linked to any of hardware vendor or product ...

If your need is to reach a high quality randomness level, you can replace your Linux random number generator software by a piece of hardware.

Some information are available here.



Singleton: How should it be used

Another implementation

class Singleton
    static Singleton& Instance()
        // lazy initialize
        if (instance_ == NULL) instance_ = new Singleton();

        return *instance_;

    Singleton() {};

    static Singleton *instance_;

program cant start because php5.dll is missing

When you open phpinfo() see if the thread safety is enable or not enable also see the version of php and see MSVC-- what is the number in place of -- and see the architecture these all things help u to get the suitable php driver

here a url help u to get a php driver

How to override a JavaScript function

You can override any built-in function by just re-declaring it.

parseFloat = function(a){

Now parseFloat(3) will alert 3.

How to change xampp localhost to another folder ( outside xampp folder)?

It can be done in two steps for Ubuntu 14.04 with Xampp 1.8.3-5

Step 1:- Change DocumentRoot and Directory path in /opt/lampp/etc/httpd.conf from

DocumentRoot "/opt/lampp/htdocs" and Directory "/opt/lampp/htdocs"

to DocumentRoot "/home/user/Desktop/js" and Directory "/home/user/Desktop/js"

Step 2:- Change the rights of folder (in path and its parent folders to 777) eg via

sudo chmod -R 777 /home/user/Desktop/js

Match everything except for specified strings

Matching any text but those matching a pattern is usually achieved with splitting the string with the regex pattern.


  • - Regex.Split(text, @"red|green|blue") or, to get rid of empty values, Regex.Split(text, @"red|green|blue").Where(x => !string.IsNullOrEmpty(x)) (see demo)
  • - Regex.Split(text, "red|green|blue") or, to remove empty items, Regex.Split(text, "red|green|blue").Where(Function(s) Not String.IsNullOrWhitespace(s)) (see demo, or this demo where LINQ is supported)
  • - text.split(/red|green|blue/) (no need to use g modifier here!) (to get rid of empty values, use text.split(/red|green|blue/).filter(Boolean)), see demo
  • - text.split("red|green|blue"), or - to keep all trailing empty items - use text.split("red|green|blue", -1), or to remove all empty items use more code to remove them (see demo)
  • - Similar to Java, text.split(/red|green|blue/), to get all trailing items use text.split(/red|green|blue/, -1) and to remove all empty items use text.split(/red|green|blue/).findAll {it != ""}) (see demo)
  • - text.split(Regex("red|green|blue")) or, to remove blank items, use text.split(Regex("red|green|blue")).filter{ !it.isBlank() }, see demo
  • - text.split("red|green|blue"), or to keep all trailing empty items, use text.split("red|green|blue", -1) and to remove all empty items, use text.split("red|green|blue").filter(_.nonEmpty) (see demo)
  • - text.split(/red|green|blue/), to get rid of empty values use .split(/red|green|blue/).reject(&:empty?) (and to get both leading and trailing empty items, use -1 as the second argument, .split(/red|green|blue/, -1)) (see demo)
  • - my @result1 = split /red|green|blue/, $text;, or with all trailing empty items, my @result2 = split /red|green|blue/, $text, -1;, or without any empty items, my @result3 = grep { /\S/ } split /red|green|blue/, $text; (see demo)
  • - preg_split('~red|green|blue~', $text) or preg_split('~red|green|blue~', $text, -1, PREG_SPLIT_NO_EMPTY) to output no empty items (see demo)
  • - re.split(r'red|green|blue', text) or, to remove empty items, list(filter(None, re.split(r'red|green|blue', text))) (see demo)
  • - Use regexp.MustCompile("red|green|blue").Split(text, -1), and if you need to remove empty items, use this code. See Go demo.

NOTE: If you patterns contain capturing groups, regex split functions/methods may behave differently, also depending on additional options. Please refer to the appropriate split method documentation then.

error while loading shared libraries:

Your system likely does not provide the ncurses library at the version android studio uses. My arch linux install only had ncurses 6 but android studio needs version 5. You could check if your distribution has a compatability package, or use the solution that Rahmat Aligos suggested.

Multiple radio button groups in MVC 4 Razor

You can use Dictonary to map Assume Milk,Butter,Chesse are group A (ListA) Water,Beer,Wine are group B

Dictonary<string,List<string>>) dataMap;

At View , you can foreach Keys in dataMap and process your action

Hibernate Criteria Restrictions AND / OR combination

think works

Criteria criteria = getSession().createCriteria(clazz); 
Criterion rest1= Restrictions.and(Restrictions.eq(A, "X"), 
 "B", Arrays.asList("X",Y)));
Criterion rest2= Restrictions.and(Restrictions.eq(A, "Y"), 
           Restrictions.eq(B, "Z"));
criteria.add(Restrictions.or(rest1, rest2));

How to get Spinner value?

The Spinner should fire an "OnItemSelected" event when something is selected:

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        Object item = parent.getItemAtPosition(pos);
    public void onNothingSelected(AdapterView<?> parent) {

g++ undefined reference to typeinfo

In the base class (an abstract base class) you declare a virtual destructor and as you cannot declare a destructor as a pure virtual function, either you have to define it right here in the abstract class, just a dummy definition like virtual ~base() { } will do, or in any of the derived class.

If you fail to do this, you will end up in an "undefined symbol" at link time. Since VMT has an entry for all the pure virtual functions with a matching NULL as it updates the table depending on the implementation in the derived class. But for the non-pure but virtual functions, it needs the definition at the link time so that it can update the VMT table.

Use c++filt to demangle the symbol. Like $c++filt _ZTIN10storageapi8BaseHostE will output something like "typeinfo for storageapi::BaseHost".

Remove an item from a dictionary when its key is unknown

This is how I would do it.

for key in some_dict.keys():
    if some_dict[key] == item_to_remove:

if else in a list comprehension

It has to do with how the list comprehension is performed.

Keep in mind the following:

[ expression for item in list if conditional ]

Is equivalent to:

for item in list:
    if conditional:

Where the expression is in a slightly different format (think switching the subject and verb order in a sentence).

Therefore, your code [x+1 for x in l if x >= 45] does this:

for x in l:
    if x >= 45:

However, this code [x+1 if x >= 45 else x+5 for x in l] does this (after rearranging the expression):

for x in l:
    if x>=45: x+1
    else: x+5

What is the size of ActionBar in pixels?

If you're using the compatibility ActionBar from the recent v7 appcompat support package, you can get the height using



How to compile Tensorflow with SSE4.2 and AVX instructions?

When building TensorFlow from source, you'll run the configure script. One of the questions that the configure script asks is as follows:

Please specify optimization flags to use during compilation when bazel option "--config=opt" is specified [Default is -march=native]

The configure script will attach the flag(s) you specify to the bazel command that builds the TensorFlow pip package. Broadly speaking, you can respond to this prompt in one of two ways:

  • If you are building TensorFlow on the same type of CPU type as the one on which you'll run TensorFlow, then you should accept the default (-march=native). This option will optimize the generated code for your machine's CPU type.
  • If you are building TensorFlow on one CPU type but will run TensorFlow on a different CPU type, then consider supplying a more specific optimization flag as described in the gcc documentation.

After configuring TensorFlow as described in the preceding bulleted list, you should be able to build TensorFlow fully optimized for the target CPU just by adding the --config=opt flag to any bazel command you are running.

How do I move focus to next input with jQuery?

Here is what worked in my case. Might be less performance intensive.


Repository Pattern Step by Step Explanation

As a summary, I would describe the wider impact of the repository pattern. It allows all of your code to use objects without having to know how the objects are persisted. All of the knowledge of persistence, including mapping from tables to objects, is safely contained in the repository.

Very often, you will find SQL queries scattered in the codebase and when you come to add a column to a table you have to search code files to try and find usages of a table. The impact of the change is far-reaching.

With the repository pattern, you would only need to change one object and one repository. The impact is very small.

Perhaps it would help to think about why you would use the repository pattern. Here are some reasons:

  • You have a single place to make changes to your data access

  • You have a single place responsible for a set of tables (usually)

  • It is easy to replace a repository with a fake implementation for testing - so you don't need to have a database available to your unit tests

There are other benefits too, for example, if you were using MySQL and wanted to switch to SQL Server - but I have never actually seen this in practice!

Excel VBA - read cell value from code

I think you need this ..

Dim n as Integer   

For n = 5 to 17
  msgbox cells(n,3) '--> sched waste
  msgbox cells(n,4) '--> type of treatm
  msgbox format(cells(n,5),"dd/MM/yyyy") '--> Lic exp
  msgbox cells(n,6) '--> email col

OS X Sprite Kit Game Optimal Default Window Size

You should target the smallest, not the largest, supported pixel resolution by the devices your app can run on.

Say if there's an actual Mac computer that can run OS X 10.9 and has a native screen resolution of only 1280x720 then that's the resolution you should focus on. Any higher and your game won't correctly run on this device and you could as well remove that device from your supported devices list.

You can rely on upscaling to match larger screen sizes, but you can't rely on downscaling to preserve possibly important image details such as text or smaller game objects.

The next most important step is to pick a fitting aspect ratio, be it 4:3 or 16:9 or 16:10, that ideally is the native aspect ratio on most of the supported devices. Make sure your game only scales to fit on devices with a different aspect ratio.

You could scale to fill but then you must ensure that on all devices the cropped areas will not negatively impact gameplay or the use of the app in general (ie text or buttons outside the visible screen area). This will be harder to test as you'd actually have to have one of those devices or create a custom build that crops the view accordingly.

Alternatively you can design multiple versions of your game for specific and very common screen resolutions to provide the best game experience from 13" through 27" displays. Optimized designs for iMac (desktop) and a Macbook (notebook) devices make the most sense, it'll be harder to justify making optimized versions for 13" and 15" plus 21" and 27" screens.

But of course this depends a lot on the game. For example a tile-based world game could simply provide a larger viewing area onto the world on larger screen resolutions rather than scaling the view up. Provided that this does not alter gameplay, like giving the player an unfair advantage (specifically in multiplayer).

You should provide @2x images for the Retina Macbook Pro and future Retina Macs.

Apache Tomcat Not Showing in Eclipse Server Runtime Environments

You need to go to Help>Eclipse Marketplace . Then type server in the search box it will display Eclipse JST Server Adapters (Apache Tomcat,...) .Select that one and install it .Then go back to Window>Preferences>Server>Runtime Environnement, click add choose Apache tomcat version then add the installation directory .

Java getHours(), getMinutes() and getSeconds()

Java 8

    System.out.println(;       // 7
    System.out.println(;     // 45
    System.out.println(;     // 32


System.out.println(Calendar.getInstance().get(Calendar.HOUR_OF_DAY));  // 7 
System.out.println(Calendar.getInstance().get(Calendar.MINUTE));       // 45
System.out.println(Calendar.getInstance().get(Calendar.SECOND));       // 32

Joda Time

    System.out.println(new DateTime().getHourOfDay());      // 7
    System.out.println(new DateTime().getMinuteOfHour());   // 45
    System.out.println(new DateTime().getSecondOfMinute()); // 32


Java 8

    // 07:48:55.056
    // 7:48:55
    System.out.println( + ":" + + ":" +;

    // 07:48:55
    System.out.println(new SimpleDateFormat("HH:mm:ss").format(Calendar.getInstance().getTime()));

    // 074855
    System.out.println(new SimpleDateFormat("HHmmss").format(Calendar.getInstance().getTime()));

    // 07:48:55 
    System.out.println(new Date().toString().substring(11, 20));

Common CSS Media Queries Break Points

I always use Desktop first, mobile first doesn't have highest priority does it? IE< 8 will show mobile css..

normal css here: 

@media screen and (max-width: 768px) {}

@media screen and (max-width: 480px) {}

sometimes some custom sizes. I don't like bootstrap etc.

Accessing localhost:port from Android emulator

I solved it with the installation of "Conveyor by Keyoti" in Visual Studio Professional 2015. Conveyor generate a REMOTE address (your IP) with a port (45455) that enable external request. Example:

enter image description here

Conveyor allows you test web applications from from external tablets and phones on your network or from Android emulators (without<hostport>)

The steps are in the following link :

SQL Server Installation - What is the Installation Media Folder?

For me the Issue was I didn't run the setup as Administrator, after running the setup as administrator the message go away and I was prompted to install and continue process.

Setting Elastic search limit to "unlimited"

From the docs, "Note that from + size can not be more than the index.max_result_window index setting which defaults to 10,000". So my admittedly very ad-hoc solution is to just pass size: 10000 or 10,000 minus from if I use the from argument.

Note that following Matt's comment below, the proper way to do this if you have a larger amount of documents is to use the scroll api. I have used this successfully, but only with the python interface.

What are differences between AssemblyVersion, AssemblyFileVersion and AssemblyInformationalVersion?


Where other assemblies that reference your assembly will look. If this number changes, other assemblies have to update their references to your assembly! Only update this version, if it breaks backward compatibility. The AssemblyVersion is required.

I use the format: major.minor. This would result in:

[assembly: AssemblyVersion("1.0")]

If you're following SemVer strictly then this means you only update when the major changes, so 1.0, 2.0, 3.0, etc.


Used for deployment. You can increase this number for every deployment. It is used by setup programs. Use it to mark assemblies that have the same AssemblyVersion, but are generated from different builds.

In Windows, it can be viewed in the file properties.

The AssemblyFileVersion is optional. If not given, the AssemblyVersion is used.

I use the format:, where I follow SemVer for the first three parts and use the buildnumber of the buildserver for the last part (0 for local build). This would result in:

[assembly: AssemblyFileVersion("")]

Be aware that System.Version names these parts as!


The Product version of the assembly. This is the version you would use when talking to customers or for display on your website. This version can be a string, like '1.0 Release Candidate'.

The AssemblyInformationalVersion is optional. If not given, the AssemblyFileVersion is used.

I use the format: major.minor[.patch] [revision as string]. This would result in:

[assembly: AssemblyInformationalVersion("1.0 RC1")]

Error: The type exists in both directories

Try to change folder name

  • from APP_CODE
  • to CODE.

This fixed my issue.

Alternatively you can move to another folder all your code files.

How to import Maven dependency in Android Studio/IntelliJ?

  1. Uncheck "Offline work" in File>Settings>Gradle>Global Gradle Settings
  2. Resync the project, for example by restarting the Android Studio
  3. Once synced, you can check the option again to work offline.

Min and max value of input in angular4 application

I succeeded by using a form control. This is my html code :

    <input type="number" min="0" max="100" required mdInput placeholder="Charge" [(ngModel)]="rateInput" name="rateInput" [formControl]="rateControl">
    <md-error>Please enter a value between 0 and 100</md-error>

And in my Typescript code, I have :

this.rateControl = new FormControl("", [Validators.max(100), Validators.min(0)])

So, if we enter a value higher than 100 or smaller than 0, the material design input become red and the field is not validate. So after, if the value is not good, I don't save when I click on the save button.

How can I pass a username/password in the header to a SOAP WCF Service

There is probably a smarter way, but you can add the headers manually like this:

var client = new IdentityProofingService.IdentityProofingWSClient();

using (new OperationContextScope(client.InnerChannel))
        new SecurityHeader("UsernameToken-49", "12345/userID", "password123"));
    client.invokeIdentityService(new IdentityProofingRequest());

Here, SecurityHeader is a custom implemented class, which needs a few other classes since I chose to use attributes to configure the XML serialization:

public class SecurityHeader : MessageHeader
    private readonly UsernameToken _usernameToken;

    public SecurityHeader(string id, string username, string password)
        _usernameToken = new UsernameToken(id, username, password);

    public override string Name
        get { return "Security"; }

    public override string Namespace
        get { return ""; }

    protected override void OnWriteHeaderContents(XmlDictionaryWriter writer, MessageVersion messageVersion)
        XmlSerializer serializer = new XmlSerializer(typeof(UsernameToken));
        serializer.Serialize(writer, _usernameToken);

[XmlRoot(Namespace = "")]
public class UsernameToken
    public UsernameToken()

    public UsernameToken(string id, string username, string password)
        Id = id;
        Username = username;
        Password = new Password() {Value = password};

    [XmlAttribute(Namespace = "")]
    public string Id { get; set; }

    public string Username { get; set; }

    public Password Password { get; set; }

public class Password
    public Password()
        Type = "";

    public string Type { get; set; }

    public string Value { get; set; }

I have not added the Nonce bit to the UsernameToken XML, but it is very similar to the Password one. The Created element also needs to be added still, but it's a simple [XmlElement].

Error in installation a R package

After using the wrong quotation mark characters in install.packages(), correcting the quote marks yielded the "cannot remove prior installation" error. Closing and restarting R worked.