Programs & Examples On #Event routing

TypeError: $.ajax(...) is not a function?

If you are using bootstrap html template remember to remove the link to jquery slim at the bottom of the template. I post this detail here as I cannot comment answers yet..

Prevent flex items from stretching

You don't want to stretch the span in height?
You have the possiblity to affect one or more flex-items to don't stretch the full height of the container.

To affect all flex-items of the container, choose this:
You have to set align-items: flex-start; to div and all flex-items of this container get the height of their content.

_x000D_
_x000D_
div {_x000D_
  align-items: flex-start;_x000D_
  background: tan;_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
}_x000D_
span {_x000D_
  background: red;_x000D_
}
_x000D_
<div>_x000D_
  <span>This is some text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

To affect only a single flex-item, choose this:
If you want to unstretch a single flex-item on the container, you have to set align-self: flex-start; to this flex-item. All other flex-items of the container aren't affected.

_x000D_
_x000D_
div {_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
  background: tan;_x000D_
}_x000D_
span.only {_x000D_
  background: red;_x000D_
  align-self:flex-start;_x000D_
}_x000D_
span {_x000D_
    background:green;_x000D_
}
_x000D_
<div>_x000D_
  <span class="only">This is some text.</span>_x000D_
  <span>This is more text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Why is this happening to the span?
The default value of the property align-items is stretch. This is the reason why the span fill the height of the div.

Difference between baseline and flex-start?
If you have some text on the flex-items, with different font-sizes, you can use the baseline of the first line to place the flex-item vertically. A flex-item with a smaller font-size have some space between the container and itself at top. With flex-start the flex-item will be set to the top of the container (without space).

_x000D_
_x000D_
div {_x000D_
  align-items: baseline;_x000D_
  background: tan;_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
}_x000D_
span {_x000D_
  background: red;_x000D_
}_x000D_
span.fontsize {_x000D_
  font-size:2em;_x000D_
}
_x000D_
<div>_x000D_
  <span class="fontsize">This is some text.</span>_x000D_
  <span>This is more text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

You can find more information about the difference between baseline and flex-start here:
What's the difference between flex-start and baseline?

Trying to start a service on boot on Android

As @Damian commented, all the answers in this thread are doing it wrong. Doing it manually like this runs the risk of your Service being stopped in the middle from the device going to sleep. You need to obtain a wake lock first. Luckily, the Support library gives us a class to do this:

public class SimpleWakefulReceiver extends WakefulBroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // This is the Intent to deliver to our service.
        Intent service = new Intent(context, SimpleWakefulService.class);

        // Start the service, keeping the device awake while it is launching.
        Log.i("SimpleWakefulReceiver", "Starting service @ " + SystemClock.elapsedRealtime());
        startWakefulService(context, service);
    }
}

then, in your Service, make sure to release the wake lock:

    @Override
    protected void onHandleIntent(Intent intent) {
        // At this point SimpleWakefulReceiver is still holding a wake lock
        // for us.  We can do whatever we need to here and then tell it that
        // it can release the wakelock.

...
        Log.i("SimpleWakefulReceiver", "Completed service @ " + SystemClock.elapsedRealtime());
        SimpleWakefulReceiver.completeWakefulIntent(intent);
    }

Don't forget to add the WAKE_LOCK permssion to your mainfest:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WAKE_LOCK" />

How can I convert a Timestamp into either Date or DateTime object?

java.sql.Timestamp is a subclass of java.util.Date. So, just upcast it.

Date dtStart = resultSet.getTimestamp("dtStart");
Date dtEnd = resultSet.getTimestamp("dtEnd");

Using SimpleDateFormat and creating Joda DateTime should be straightforward from this point on.

Best way to convert strings to symbols in hash

For the specific case of YAML in Ruby, if the keys begin with ':', they will be automatically interned as symbols.

require 'yaml'
require 'pp'
yaml_str = "
connections:
  - host: host1.example.com
    port: 10000
  - host: host2.example.com
    port: 20000
"
yaml_sym = "
:connections:
  - :host: host1.example.com
    :port: 10000
  - :host: host2.example.com
    :port: 20000
"
pp yaml_str = YAML.load(yaml_str)
puts yaml_str.keys.first.class
pp yaml_sym = YAML.load(yaml_sym)
puts yaml_sym.keys.first.class

Output:

#  /opt/ruby-1.8.6-p287/bin/ruby ~/test.rb
{"connections"=>
  [{"port"=>10000, "host"=>"host1.example.com"},
   {"port"=>20000, "host"=>"host2.example.com"}]}
String
{:connections=>
  [{:port=>10000, :host=>"host1.example.com"},
   {:port=>20000, :host=>"host2.example.com"}]}
Symbol

Passing by reference in C

p is a pointer variable. Its value is the address of i. When you call f, you pass the value of p, which is the address of i.

facebook: permanent Page Access Token?

In addition to the recommended steps in the Vlasec answer, you can use:

  • Graph API explorer to make the queries, e.g. /{pageId}?fields=access_token&access_token=THE_ACCESS_TOKEN_PROVIDED_BY_GRAPH_EXPLORER
  • Access Token Debugger to get information about the access token.

Unable to add window -- token android.os.BinderProxy is not valid; is your activity running?

Under dependencyServices nothing of the above helped me, i ended up doing like below:

    class Static_Toast_Android
    {
        private static Context _context
        {
            get { return Android.App.Application.Context; }
        }
        public static void StaticDisplayToast(string message)
        {
            Toast.MakeText(_context, message, ToastLength.Long).Show();
        }
    }
    public class Toast_Android : IToast
    {

        public void DisplayToast(string message)
        {
            Static_Toast_Android.StaticDisplayToast(message);
        }
    }

I must use the "double-class" because an interface cannot be static. L-

Defining an abstract class without any abstract methods

YES You can create abstract class with out any abstract method the best example of abstract class without abstract method is HttpServlet
Abstract Method is a method which have no body, If you declared at least one method into the class, the class must be declared as an abstract its mandatory BUT if you declared the abstract class its not mandatory to declared the abstract method inside the class.

You cannot create objects of abstract class, which means that it cannot be instantiated.

Replace values in list using Python

This might help...

test_list = [5, 8]
test_list[0] = None
print test_list
#prints [None, 8]

glm rotate usage in Opengl

You need to multiply your Model matrix. Because that is where model position, scaling and rotation should be (that's why it's called the model matrix).

All you need to do is (see here)

Model = glm::rotate(Model, angle_in_radians, glm::vec3(x, y, z)); // where x, y, z is axis of rotation (e.g. 0 1 0)

Note that to convert from degrees to radians, use glm::radians(degrees)

That takes the Model matrix and applies rotation on top of all the operations that are already in there. The other functions translate and scale do the same. That way it's possible to combine many transformations in a single matrix.

note: earlier versions accepted angles in degrees. This is deprecated since 0.9.6

Model = glm::rotate(Model, angle_in_degrees, glm::vec3(x, y, z)); // where x, y, z is axis of rotation (e.g. 0 1 0)

When to use malloc for char pointers

malloc is for allocating memory on the free-store. If you have a string literal that you do not want to modify the following is ok:

char *literal = "foo";

However, if you want to be able to modify it, use it as a buffer to hold a line of input and so on, use malloc:

char *buf = (char*) malloc(BUFSIZE); /* define BUFSIZE before */
// ...
free(buf);

React won't load local images

By doing a simple import you can access the image in React

import logo from "../images/logo.png";
<img src={logo}/>

Everything solved! Just a simple fix =)

Error: TypeError: $(...).dialog is not a function

I just experienced this with the line:

$('<div id="editor" />').dialogelfinder({

I got the error "dialogelfinder is not a function" because another component was inserting a call to load an older version of JQuery (1.7.2) after the newer version was loaded.

As soon as I commented out the second load, the error went away.

$.ajax( type: "POST" POST method to php

You need to use data: {title: title} to POST it correctly.

In the PHP code you need to echo the value instead of returning it.

Convert date field into text in Excel

You don't need to convert the original entry - you can use TEXT function in the concatenation formula, e.g. with date in A1 use a formula like this

="Today is "&TEXT(A1,"dd-mm-yyyy")

You can change the "dd-mm-yyyy" part as required

Java Serializable Object to Byte Array

The best way to do it is to use SerializationUtils from Apache Commons Lang.

To serialize:

byte[] data = SerializationUtils.serialize(yourObject);

To deserialize:

YourObject yourObject = SerializationUtils.deserialize(data)

As mentioned, this requires Commons Lang library. It can be imported using Gradle:

compile 'org.apache.commons:commons-lang3:3.5'

Maven:

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.5</version>
</dependency>

Jar file

And more ways mentioned here

Alternatively, the whole collection can be imported. Refer this link

PHP regular expression - filter number only

Using is_numeric or intval is likely the best way to validate a number here, but to answer your question you could try using preg_replace instead. This example removes all non-numeric characters:

$output = preg_replace( '/[^0-9]/', '', $string );

Qt jpg image display

I understand your frustration the " Graphics view widget" is not the best way to do this, yes it can be done, but it's almost exactly the same as using a label ( for what you want any way) now all the ways listed do work but...

For you and any one else that may come across this question he easiest way to do it ( what you're asking any way ) is this.

QPixmap pix("Path\\path\\entername.jpeg");
    ui->label->setPixmap(pix);

}

ReferenceError: variable is not defined

Got the error (in the function init) with the following code ;

"use strict" ;

var hdr ;

function init(){ // called on load
    hdr = document.getElementById("hdr");
}

... while using the stock browser on a Samsung galaxy Fame ( crap phone which makes it a good tester ) - userAgent ; Mozilla/5.0 (Linux; U; Android 4.1.2; en-gb; GT-S6810P Build/JZO54K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30

The same code works everywhere else I tried including the stock browser on an older HTC phone - userAgent ; Mozilla/5.0 (Linux; U; Android 2.3.5; en-gb; HTC_WildfireS_A510e Build/GRJ90) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1

The fix for this was to change

var hdr ;

to

var hdr = null ;

How to get elements with multiple classes

AND (both classes)

var list = document.getElementsByClassName("class1 class2");
var list = document.querySelectorAll(".class1.class2");

OR (at least one class)

var list = document.querySelectorAll(".class1,.class2");

XOR (one class but not the other)

var list = document.querySelectorAll(".class1:not(.class2),.class2:not(.class1)");

NAND (not both classes)

var list = document.querySelectorAll(":not(.class1),:not(.class2)");

NOR (not any of the two classes)

var list = document.querySelectorAll(":not(.class1):not(.class2)");

How do I create and store md5 passwords in mysql

Why don't you use the MySQL built in password hasher:

http://dev.mysql.com/doc/refman/5.1/en/password-hashing.html

mysql> SELECT PASSWORD('mypass');
+-------------------------------------------+
| PASSWORD('mypass')                        |
+-------------------------------------------+
| *6C8989366EAF75BB670AD8EA7A7FC1176A95CEF4 |
+-------------------------------------------+

for comparison you could something like this:

select id from PassworTable where Userid='<userid>' and Password=PASSWORD('<password>')

and if it returns a value then the user is correct.

Bitbucket fails to authenticate on git pull

I think is only an authentication problem...

  1. Click on your Bitbucket account icon (up right) and go to "Manage account".
  2. Go to "Change password" option in left menu.
  3. Enter your password in "New password" and "Confirm password" fields.
  4. Click on "Change password".

That's all :)

Difference between abstract class and interface in Python

Python >= 2.6 has Abstract Base Classes.

Abstract Base Classes (abbreviated ABCs) complement duck-typing by providing a way to define interfaces when other techniques like hasattr() would be clumsy. Python comes with many builtin ABCs for data structures (in the collections module), numbers (in the numbers module), and streams (in the io module). You can create your own ABC with the abc module.

There is also the Zope Interface module, which is used by projects outside of zope, like twisted. I'm not really familiar with it, but there's a wiki page here that might help.

In general, you don't need the concept of abstract classes, or interfaces in python (edited - see S.Lott's answer for details).

How to set selected index JComboBox by value

Why not take a collection, likely a Map such as a HashMap, and use it as the nucleus of your own combo box model class that implements the ComboBoxModel interface? Then you could access your combo box's items easily via their key Strings rather than ints.

For instance...

import java.util.HashMap;
import java.util.Map;

import javax.swing.ComboBoxModel;
import javax.swing.event.ListDataListener;

public class MyComboModel<K, V>   implements ComboBoxModel {
   private Map<K, V> nucleus = new HashMap<K, V>();

   // ... any constructors that you want would go here

   public void put(K key, V value) {
      nucleus.put(key, value);
   }

   public V get(K key) {
      return nucleus.get(key);
   }

   @Override
   public void addListDataListener(ListDataListener arg0) {
      // TODO Auto-generated method stub

   }

   // ... plus all the other methods required by the interface
}

Parsing JSON using C

cJSON has a decent API and is small (2 files, ~700 lines). Many of the other JSON parsers I looked at first were huge... I just want to parse some JSON.

Edit: We've made some improvements to cJSON over the years.

How to change color in markdown cells ipython/jupyter notebook?

An alternative way to do that, is to enter a LaTeX environment within the notebook and change color from there (which is great if you are more fluent in LaTeX than in HTML). Example:

$\color{red}{\text{ciao}}$

would display ciao in red.

How do I check to see if my array includes an object?

If you want to check if an object is within in array by checking an attribute on the object, you can use any? and pass a block that evaluates to true or false:

unless @suggested_horses.any? {|h| h.id == horse.id }
  @suggested_horses << horse
end

Dockerfile copy keep subdirectory structure

To merge a local directory into a directory within an image, do this. It will not delete files already present within the image. It will only add files that are present locally, overwriting the files in the image if a file of the same name already exists.

COPY ./files/. /files/

Printing HashMap In Java

I did it using String map (if you're working with String Map).

for (Object obj : dados.entrySet()) {
    Map.Entry<String, String> entry = (Map.Entry) obj;
    System.out.print("Key: " + entry.getKey());
    System.out.println(", Value: " + entry.getValue());
}

Min / Max Validator in Angular 2 Final

Angular now supports min/max validators by default.

Angular provides the following validators by default. Adding the list here so that new comers can easily get to know what are the current supported default validators and google it further as per their interest.

  • min
  • max
  • required
  • requiredTrue
  • email
  • minLength
  • maxLength
  • pattern
  • nullValidator
  • compose
  • composeAsync

you will get the complete list Angular validators

How to use min/max validator: From the documentation of Angular -

static min(min: number): ValidatorFn 
static max(max: number): ValidatorFn 

min()/max() is a static function that accepts a number parameter and returns A validator function that returns an error map with the min/max property if the validation check fails, otherwise null.

use min validator in formControl, (for further info, click here)

const control = new FormControl(9, Validators.min(10));

use max validator in formControl, (for further info, click here)

const control = new FormControl(11, Validators.max(10));

sometimes we need to add validator dynamically. setValidators() is the saviour. you can use it like the following -

const control = new FormControl(10);
control.setValidators([Validators.min(9), Validators.max(11)]);

How do I watch a file for changes?

As you can see in Tim Golden's article, pointed by Horst Gutmann, WIN32 is relatively complex and watches directories, not a single file.

I'd like to suggest you look into IronPython, which is a .NET python implementation. With IronPython you can use all the .NET functionality - including

System.IO.FileSystemWatcher

Which handles single files with a simple Event interface.

Input group - two inputs close to each other

Create a input-group-glue class with this:

_x000D_
_x000D_
.input-group-glue {_x000D_
  width: 0;_x000D_
  display: table-cell;_x000D_
}_x000D_
_x000D_
.input-group-glue + .form-control {_x000D_
  border-left: none;_x000D_
}
_x000D_
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<div class="input-group">_x000D_
  <input type="text" class="form-control" value="test1" />_x000D_
  <span class="input-group-glue"></span>_x000D_
  <input type="text" class="form-control" value="test2" />_x000D_
  <span class="input-group-glue"></span>_x000D_
  <input type="text" class="form-control" value="test2" />_x000D_
</div>
_x000D_
_x000D_
_x000D_

Git add and commit in one command

You can use git aliases, e.g.

git config --global alias.add-commit '!git add -A && git commit'

and use it with

git add-commit -m 'My commit message'

EDIT: Reverted back to ticks ('), as otherwise it will fail for shell expansion on Linux. On Windows, one should use double-quotes (") instead (pointed out in the comments, did not verify).

Error:Execution failed for task ':ProjectName:mergeDebugResources'. > Crunching Cruncher *some file* failed, see logs

Close android studio and open it again. Then try compiling the same code. I was getting the same error and it worked for me. Hope it helps.

Stop node.js program from command line

on linux try: pkill node

on windows:

Taskkill /IM node.exe /F

or

from subprocess import call

call(['taskkill', '/IM', 'node.exe', '/F'])

send checkbox value in PHP form

replace:

$name = $_POST['name']; 
$email_address = $_POST['email']; 
$message = $_POST['tel']; 

with:

$name = $_POST['name']; 
$email_address = $_POST['email']; 
$message = $_POST['tel'];
if (isset($_POST['newsletter'])) {
  $checkBoxValue = "yes";
} else {
  $checkBoxValue = "no";
}

then replace this line of code:

$email_body = "You have received a new message. ".
    " Here are the details:\n Name: $name \n Email: $email_address \n Tel \n $message\n Newsletter \n $newsletter"

with:

$email_body = "You have received a new message. ".
    " Here are the details:\n Name: $name \n Email: $email_address \n Tel \n $message\n Newsletter \n $newsletter";

How to read data from java properties file using Spring Boot

i would suggest the following way:

@PropertySource(ignoreResourceNotFound = true, value = "classpath:otherprops.properties")
@Controller
public class ClassA {
    @Value("${myName}")
    private String name;

    @RequestMapping(value = "/xyz")
    @ResponseBody
    public void getName(){
        System.out.println(name);
    }
}

Here your new properties file name is "otherprops.properties" and the property name is "myName". This is the simplest implementation to access properties file in spring boot version 1.5.8.

C#: List All Classes in Assembly

Use Assembly.GetTypes. For example:

Assembly mscorlib = typeof(string).Assembly;
foreach (Type type in mscorlib.GetTypes())
{
    Console.WriteLine(type.FullName);
}

How add "or" in switch statements?

Case-statements automatically fall through if you don't specify otherwise (by writing break). Therefor you can write

switch(myvar)
{
   case 2:
   case 5:
   {
      //your code
   break;
   }

// etc... }

How to convert an address into a Google Maps Link (NOT MAP)

I know I'm very late to the game, but thought I'd contribute for posterity's sake.

I wrote a short jQuery function that will automatically turn any <address> tags into Google maps links.

See a demo here.

$(document).ready(function () {
   //Convert address tags to google map links - Michael Jasper 2012
   $('address').each(function () {
      var link = "<a href='http://maps.google.com/maps?q=" + encodeURIComponent( $(this).text() ) + "' target='_blank'>" + $(this).text() + "</a>";
      $(this).html(link);
   });
});

Bonus:

I also came across a situation that called for generating embedded maps from the links, and though I'd share with future travelers:

View a full demo

$(document).ready(function(){
    $("address").each(function(){                         
        var embed ="<iframe width='425' height='350' frameborder='0' scrolling='no'  marginheight='0' marginwidth='0' src='https://maps.google.com/maps?&amp;q="+ encodeURIComponent( $(this).text() ) +"&amp;output=embed'></iframe>";
        $(this).html(embed);             
    });
});

Why "net use * /delete" does not work but waits for confirmation in my PowerShell script?

With PowerShell 5.1 in Windows 10 you can use:

Get-SmbMapping | Remove-SmbMapping -Confirm:$false

Best Way to Refresh Adapter/ListView on Android

Just write in your Custom ArrayAdaper this code:

private List<Cart_items> customListviewList ;

refreshEvents(carts);

public void refreshEvents(List<Cart_items> events)
{
    this.customListviewList.clear();
    this.customListviewList.addAll(events);
    notifyDataSetChanged();
}

length and length() in Java

In Java, an Array stores its length separately from the structure that actually holds the data. When you create an Array, you specify its length, and that becomes a defining attribute of the Array. No matter what you do to an Array of length N (change values, null things out, etc.), it will always be an Array of length N.

A String's length is incidental; it is not an attribute of the String, but a byproduct. Though Java Strings are in fact immutable, if it were possible to change their contents, you could change their length. Knocking off the last character (if it were possible) would lower the length.

I understand this is a fine distinction, and I may get voted down for it, but it's true. If I make an Array of length 4, that length of four is a defining characteristic of the Array, and is true regardless of what is held within. If I make a String that contains "dogs", that String is length 4 because it happens to contain four characters.

I see this as justification for doing one with an attribute and the other with a method. In truth, it may just be an unintentional inconsistency, but it's always made sense to me, and this is always how I've thought about it.

Jquery Validate custom error message location

This Worked for me

Actually error is a array which contain error message and other values for elements we pass, you can console.log(error); and see. Inside if condition "error.appendTo($(element).parents('div').find($('.errorEmail')));" Is nothing but finding html element in code and passing the error message.

    $("form[name='contactUs']").validate({
rules: {
    message: 'required',
    name: "required",
    phone_number: {
        required: true,
        minlength: 10,
        maxlength: 10,
        number: false
    },
    email: {
        required: true,
        email: true
    }
},
messages: {
    name: "Please enter your name",
    email: "Please enter a valid email address",
    message: "Please enter your message",
    phone_number: "Please enter a valid mobile number"
},
errorPlacement: function(error, element) {
        $("#errorText").empty();

        if(error[0].htmlFor == 'name')
        {
            error.appendTo($(element).parents('div').find($('.errorName')));
        }
        if(error[0].htmlFor == 'email')
        {
            error.appendTo($(element).parents('div').find($('.errorEmail')));
        }
        if(error[0].htmlFor == 'phone_number')
        {
            error.appendTo($(element).parents('div').find($('.errorMobile')));
        }
        if(error[0].htmlFor == 'message')
        {
            error.appendTo($(element).parents('div').find($('.errorMessage')));
        }
      }
    });

How to identify which columns are not "NA" per row in a matrix?

Try:

which( !is.na(p), arr.ind=TRUE)

Which I think is just as informative and probably more useful than the output you specified, But if you really wanted the list version, then this could be used:

> apply(p, 1, function(x) which(!is.na(x)) )
[[1]]
[1] 2 3

[[2]]
[1] 4 7

[[3]]
integer(0)

[[4]]
[1] 5

[[5]]
integer(0)

Or even with smushing together with paste:

lapply(apply(p, 1, function(x) which(!is.na(x)) ) , paste, collapse=", ")

The output from which function the suggested method delivers the row and column of non-zero (TRUE) locations of logical tests:

> which( !is.na(p), arr.ind=TRUE)
     row col
[1,]   1   2
[2,]   1   3
[3,]   2   4
[4,]   4   5
[5,]   2   7

Without the arr.ind parameter set to non-default TRUE, you only get the "vector location" determined using the column major ordering the R has as its convention. R-matrices are just "folded vectors".

> which( !is.na(p) )
[1]  6 11 17 24 32

Python 2: AttributeError: 'list' object has no attribute 'strip'

Split the strings and then use chain.from_iterable to combine them into a single list

>>> import itertools
>>> l = ['Facebook;Google+;MySpace', 'Apple;Android']
>>> l1 = [ x for x in itertools.chain.from_iterable( x.split(';') for x in l ) ]
>>> l1
['Facebook', 'Google+', 'MySpace', 'Apple', 'Android']

Getting attribute of element in ng-click function in angularjs

Even more simple, pass the $event object to ng-click to access the event properties. As an example:

<a ng-click="clickEvent($event)" class="exampleClass" id="exampleID" data="exampleData" href="">Click Me</a>

Within your clickEvent() = function(obj) {} function you can access the data value like this:

var dataValue = obj.target.attributes.data.value;

Which would return exampleData.

Here's a full jsFiddle.

Convert string to JSON array

If having following JSON from web service, Json Array as a response :

       [3]
 0:  {
 id: 2
 name: "a561137"
 password: "test"
 firstName: "abhishek"
 lastName: "ringsia"
 organization: "bbb"
    }-
1:  {
 id: 3
 name: "a561023"
 password: "hello"
 firstName: "hello"
  lastName: "hello"
  organization: "hello"
 }-
 2:  {
  id: 4
  name: "a541234"
  password: "hello"
  firstName: "hello"
  lastName: "hello"
  organization: "hello"
    }

have To Accept it first as a Json Array ,then while reading its Object have to use Object Mapper.readValue ,because Json Object Still in String .

      List<User> list = new ArrayList<User>();
      JSONArray jsonArr = new JSONArray(response);


      for (int i = 0; i < jsonArr.length(); i++) {
        JSONObject jsonObj = jsonArr.getJSONObject(i);
         ObjectMapper mapper = new ObjectMapper();
        User usr = mapper.readValue(jsonObj.toString(), User.class);      
        list.add(usr);

    }

mapper.read is correct function ,if u use mapper.convert(param,param) . It will give u error .

How to set entire application in portrait mode only?

Add android:screenOrientation="portrait" to the activity in the AndroidManifest.xml. For example:

<activity android:name=".SomeActivity"
    android:label="@string/app_name"
    android:screenOrientation="portrait">

Rendering HTML in a WebView with custom CSS

You could use WebView.loadDataWithBaseURL

htmlData = "<link rel=\"stylesheet\" type=\"text/css\" href=\"style.css\" />" + htmlData;
// lets assume we have /assets/style.css file
webView.loadDataWithBaseURL("file:///android_asset/", htmlData, "text/html", "UTF-8", null);

And only after that WebView will be able to find and use css-files from the assets directory.

ps And, yes, if you load your html-file form the assets folder, you don't need to specify a base url.

json_decode to array

try this

$json_string = 'http://www.domain.com/jsondata.json';
$jsondata = file_get_contents($json_string);
$obj = json_decode($jsondata,true);
echo "<pre>";
print_r($obj);

When do you use Java's @Override annotation and why?

Using the @Override annotation acts as a compile-time safeguard against a common programming mistake. It will throw a compilation error if you have the annotation on a method you're not actually overriding the superclass method.

The most common case where this is useful is when you are changing a method in the base class to have a different parameter list. A method in a subclass that used to override the superclass method will no longer do so due the changed method signature. This can sometimes cause strange and unexpected behavior, especially when dealing with complex inheritance structures. The @Override annotation safeguards against this.

How to check if an element of a list is a list (in Python)?

Expression you are looking for may be:

...
return any( isinstance(e, list) for e in my_list )

Testing:

>>> my_list = [1,2]
>>> any( isinstance(e, list) for e in my_list )
False
>>> my_list = [1,2, [3,4,5]]
>>> any( isinstance(e, list) for e in my_list )
True
>>> 

How to copy directories in OS X 10.7.3?

tl;dr

cp -R "/src/project 1/App" "/src/project 2"

Explanation:

Using quotes will cater for spaces in the directory names

cp -R "/src/project 1/App" "/src/project 2"

If the App directory is specified in the destination directory:

cp -R "/src/project 1/App" "/src/project 2/App"

and "/src/project 2/App" already exists the result will be "/src/project 2/App/App"

Best not to specify the directory copied in the destination so that the command can be repeated over and over with the expected result.

Inside a bash script:

cp -R "${1}/App" "${2}"

OpenSSL and error in reading openssl.conf file

I had the same issue on Windows. It was resolved by setting the environment variable as follow:

Variable name: OPENSSL_CONF Variable value: C:(OpenSSl Directory)\bin\openssl.cnf

A good Sorted List for Java

Depending on how you're using the list, it may be worth it to use a TreeSet and then use the toArray() method at the end. I had a case where I needed a sorted list, and I found that the TreeSet + toArray() was much faster than adding to an array and merge sorting at the end.

Windows equivalent of OS X Keychain?

OS X keychain equivalent is Credential Manager in windows.

Find stored procedure by name

Option 1: In SSMS go to View > Object Explorer Details or press F7. Use the Search box. Finally in the displayed list right click and select Synchronize to find the object in the Object Explorer tree.

Object Explorer Details

Option 2: Install an Add-On like dbForge Search. Right click on the displayed list and select Find in Object Explorer.

enter image description here

I don't understand -Wl,-rpath -Wl,

The -Wl,xxx option for gcc passes a comma-separated list of tokens as a space-separated list of arguments to the linker. So

gcc -Wl,aaa,bbb,ccc

eventually becomes a linker call

ld aaa bbb ccc

In your case, you want to say "ld -rpath .", so you pass this to gcc as -Wl,-rpath,. Alternatively, you can specify repeat instances of -Wl:

gcc -Wl,aaa -Wl,bbb -Wl,ccc

Note that there is no comma between aaa and the second -Wl.

Or, in your case, -Wl,-rpath -Wl,..

Using Python's ftplib to get a directory listing, portably

There's no standard for the layout of the LIST response. You'd have to write code to handle the most popular layouts. I'd start with Linux ls and Windows Server DIR formats. There's a lot of variety out there, though.

Fall back to the nlst method (returning the result of the NLST command) if you can't parse the longer list. For bonus points, cheat: perhaps the longest number in the line containing a known file name is its length.

Convert number to varchar in SQL with formatting

You can try this

DECLARE @Table TABLE(
        Val INT
)

INSERT INTO @Table SELECT 3
INSERT INTO @Table SELECT 30

DECLARE @NumberPrefix INT
SET @NumberPrefix = 2
SELECT  REPLICATE('0', @NumberPrefix - LEN(Val)) + CAST(Val AS VARCHAR(10))
FROM    @Table

Find the index of a dict within a list, by matching the dict's value

Seems most logical to use a filter/index combo:

names=[{}, {'name': 'Tom'},{'name': 'Tony'}]
names.index(filter(lambda n: n.get('name') == 'Tom', names)[0])
1

And if you think there could be multiple matches:

[names.index(n) for item in filter(lambda n: n.get('name') == 'Tom', names)]
[1]

Enabling HTTPS on express.js

I ran into a similar issue with getting SSL to work on a port other than port 443. In my case I had a bundle certificate as well as a certificate and a key. The bundle certificate is a file that holds multiple certificates, node requires that you break those certificates into separate elements of an array.

    var express = require('express');
    var https = require('https');
    var fs = require('fs');

    var options = {
      ca: [fs.readFileSync(PATH_TO_BUNDLE_CERT_1), fs.readFileSync(PATH_TO_BUNDLE_CERT_2)],
      cert: fs.readFileSync(PATH_TO_CERT),
      key: fs.readFileSync(PATH_TO_KEY)
    };

    app = express()

    app.get('/', function(req,res) {
        res.send('hello');
    });

    var server = https.createServer(options, app);

    server.listen(8001, function(){
        console.log("server running at https://IP_ADDRESS:8001/")
    });

In app.js you need to specify https and create the server accordingly. Also, make sure that the port you're trying to use is actually allowing inbound traffic.

is there any IE8 only css hack?

There are various ways to get a class onto the HTML element, identifying which IE version you're contending with: Modernizr, the HTML 5 Boilerplate, etc - or just roll your own. Then you can use that class (eg .lt-ie9) in a normal CSS selector, no hack needed. If you only want to affect IE8 and not previous versions, put the old value back using a .lt-ie8 selector.

Android: how to hide ActionBar on certain activities

First cheek MainActivity for activity tag,Like -

public class MainActivity extends AppCompatActivity

Then goto menifest xml file and write-

android:theme="@style/Theme.AppCompat.Light.NoActionBar"

in activity tag

Visual Studio 2015 is very slow

I had the same problem with VS 2015 Community with Node Tools.

I saw some issues about this problem in the NTVS github repository, and it may related to analysis file in the project. In fact, I have deleted this file every project load and it gets faster, but I think the safest way to improve it is ignoring some directory files like the link below.

https://github.com/Microsoft/nodejstools/wiki/Projects#ignoring-directories-for-analysis

What is the difference between IEnumerator and IEnumerable?

An IEnumerator is a thing that can enumerate: it has the Current property and the MoveNext and Reset methods (which in .NET code you probably won't call explicitly, though you could).

An IEnumerable is a thing that can be enumerated...which simply means that it has a GetEnumerator method that returns an IEnumerator.

Which do you use? The only reason to use IEnumerator is if you have something that has a nonstandard way of enumerating (that is, of returning its various elements one-by-one), and you need to define how that works. You'd create a new class implementing IEnumerator. But you'd still need to return that IEnumerator in an IEnumerable class.

For a look at what an enumerator (implementing IEnumerator<T>) looks like, see any Enumerator<T> class, such as the ones contained in List<T>, Queue<T>, or Stack<T>. For a look at a class implementing IEnumerable, see any standard collection class.

ReCaptcha API v2 Styling

You can recreate recaptcha , wrap it in a container and only let the checkbox visible. My main problem was that I couldn't take the full width so now it expands to the container width. The only problem is the expiration you can see a flick but as soon it happens I reset it.

See this demo http://codepen.io/alejandrolechuga/pen/YpmOJX

enter image description here

_x000D_
_x000D_
function recaptchaReady () {_x000D_
  grecaptcha.render('myrecaptcha', {_x000D_
  'sitekey': '6Lc7JBAUAAAAANrF3CJaIjt7T9IEFSmd85Qpc4gj',_x000D_
  'expired-callback': function () {_x000D_
    grecaptcha.reset();_x000D_
    console.log('recatpcha');_x000D_
  }_x000D_
});_x000D_
}
_x000D_
.recaptcha-wrapper {_x000D_
    height: 70px;_x000D_
  overflow: hidden;_x000D_
  background-color: #F9F9F9;_x000D_
  border-radius: 3px;_x000D_
  box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);_x000D_
  -webkit-box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);_x000D_
  -moz-box-shadow: 0px 0px 4px 1px rgba(0,0,0,0.08);_x000D_
  height: 70px;_x000D_
  position: relative;_x000D_
  margin-top: 17px;_x000D_
  border: 1px solid #d3d3d3;_x000D_
  color: #000;_x000D_
}_x000D_
_x000D_
.recaptcha-info {_x000D_
  background-size: 32px;_x000D_
  height: 32px;_x000D_
  margin: 0 13px 0 13px;_x000D_
  position: absolute;_x000D_
  right: 8px;_x000D_
  top: 9px;_x000D_
  width: 32px;_x000D_
  background-image: url(https://www.gstatic.com/recaptcha/api2/logo_48.png);_x000D_
  background-repeat: no-repeat;_x000D_
}_x000D_
.rc-anchor-logo-text {_x000D_
  color: #9b9b9b;_x000D_
  cursor: default;_x000D_
  font-family: Roboto,helvetica,arial,sans-serif;_x000D_
  font-size: 10px;_x000D_
  font-weight: 400;_x000D_
  line-height: 10px;_x000D_
  margin-top: 5px;_x000D_
  text-align: center;_x000D_
  position: absolute;_x000D_
  right: 10px;_x000D_
  top: 37px;_x000D_
}_x000D_
.rc-anchor-checkbox-label {_x000D_
  font-family: Roboto,helvetica,arial,sans-serif;_x000D_
  font-size: 14px;_x000D_
  font-weight: 400;_x000D_
  line-height: 17px;_x000D_
  left: 50px;_x000D_
  top: 26px;_x000D_
  position: absolute;_x000D_
  color: black;_x000D_
}_x000D_
.rc-anchor .rc-anchor-normal .rc-anchor-light {_x000D_
  border: none;_x000D_
}_x000D_
.rc-anchor-pt {_x000D_
  color: #9b9b9b;_x000D_
  font-family: Roboto,helvetica,arial,sans-serif;_x000D_
  font-size: 8px;_x000D_
  font-weight: 400;_x000D_
  right: 10px;_x000D_
  top: 53px;_x000D_
  position: absolute;_x000D_
  a:link {_x000D_
    color: #9b9b9b;_x000D_
    text-decoration: none;_x000D_
  }_x000D_
}_x000D_
_x000D_
g-recaptcha {_x000D_
  // transform:scale(0.95);_x000D_
  // -webkit-transform:scale(0.95);_x000D_
  // transform-origin:0 0;_x000D_
  // -webkit-transform-origin:0 0;_x000D_
_x000D_
}_x000D_
_x000D_
.g-recaptcha {_x000D_
  width: 41px;_x000D_
_x000D_
  /* border: 1px solid red; */_x000D_
  height: 38px;_x000D_
  overflow: hidden;_x000D_
  float: left;_x000D_
  margin-top: 16px;_x000D_
  margin-left: 6px;_x000D_
  _x000D_
    > div {_x000D_
    width: 46px;_x000D_
    height: 30px;_x000D_
    background-color:  #F9F9F9;_x000D_
    overflow: hidden;_x000D_
    border: 1px solid red;_x000D_
    transform: translate3d(-8px, -19px, 0px);_x000D_
  }_x000D_
  div {_x000D_
    border: 0;_x000D_
  }_x000D_
}
_x000D_
<script src='https://www.google.com/recaptcha/api.js?onload=recaptchaReady&&render=explicit'></script>_x000D_
_x000D_
<div class="recaptcha-wrapper">_x000D_
  <div id="myrecaptcha" class="g-recaptcha"></div>_x000D_
          <div class="rc-anchor-checkbox-label">I'm not a Robot.</div>_x000D_
        <div class="recaptcha-info"></div>_x000D_
        <div class="rc-anchor-logo-text">reCAPTCHA</div>_x000D_
        <div class="rc-anchor-pt">_x000D_
          <a href="https://www.google.com/intl/en/policies/privacy/" target="_blank">Privacy</a>_x000D_
          <span aria-hidden="true" role="presentation"> - </span>_x000D_
          <a href="https://www.google.com/intl/en/policies/terms/" target="_blank">Terms</a>_x000D_
        </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

What is the difference between Trap and Interrupt?

A trap is a software interrupt.If you write a program in which you declare a variable having divide by zero value then it is treated as a trap.Whenever you run this program it will throw same error at the same time.System call is a special version of trap in which a program asks os for its required service. In case of interrupt(a general word for hardware interrupts)like an i/o error,the cpu is interrupted at random time and off course it is not the fault of our programmers.It is the hardware that brings them up.

Switch case in C# - a constant value is expected

This seems to work for me at least when i tried on visual studio 2017.

public static class Words
{
     public const string temp = "What";
     public const string temp2 = "the";
}
var i = "the";

switch (i)
{
  case Words.temp:
    break;
  case Words.temp2:
    break;
}

How to set the title text color of UIButton?

Swift UI solution

Button(action: {}) {
            Text("Button")
        }.foregroundColor(Color(red: 1.0, green: 0.0, blue: 0.0))

Swift 3, Swift 4, Swift 5

to improve comments. This should work:

button.setTitleColor(.red, for: .normal)

Failed to execute removeChild on Node

Your myCoolDiv element isn't a child of the player container. It's a child of the div you created as a wrapper for it (markerDiv in the first part of the code). Which is why it fails, removeChild only removes children, not descendants.

You'd want to remove that wrapper div, or not add it at all.

Here's the "not adding it at all" option:

_x000D_
_x000D_
var markerDiv = document.createElement("div");_x000D_
markerDiv.innerHTML = "<div id='MyCoolDiv' style='color: #2b0808'>123</div>";_x000D_
document.getElementById("playerContainer").appendChild(markerDiv.firstChild);_x000D_
// -------------------------------------------------------------^^^^^^^^^^^_x000D_
_x000D_
setTimeout(function(){ _x000D_
    var myCoolDiv = document.getElementById("MyCoolDiv");_x000D_
    document.getElementById("playerContainer").removeChild(myCoolDiv);_x000D_
}, 1500);
_x000D_
<div id="playerContainer"></div>
_x000D_
_x000D_
_x000D_

Or without using the wrapper (although it's quite handy for parsing that HTML):

_x000D_
_x000D_
var myCoolDiv = document.createElement("div");_x000D_
// Don't reall need this: myCoolDiv.id = "MyCoolDiv";_x000D_
myCoolDiv.style.color = "#2b0808";_x000D_
myCoolDiv.appendChild(_x000D_
  document.createTextNode("123")_x000D_
);_x000D_
document.getElementById("playerContainer").appendChild(myCoolDiv);_x000D_
_x000D_
setTimeout(function(){ _x000D_
    // No need for this, we already have it from the above:_x000D_
    // var myCoolDiv = document.getElementById("MyCoolDiv");_x000D_
    document.getElementById("playerContainer").removeChild(myCoolDiv);_x000D_
}, 1500);
_x000D_
<div id="playerContainer"></div>
_x000D_
_x000D_
_x000D_

Difference between "move" and "li" in MIPS assembly language

The move instruction copies a value from one register to another. The li instruction loads a specific numeric value into that register.

For the specific case of zero, you can use either the constant zero or the zero register to get that:

move $s0, $zero
li   $s0, 0

There's no register that generates a value other than zero, though, so you'd have to use li if you wanted some other number, like:

li $s0, 12345678

Error in launching AVD with AMD processor

For AMD processors:

You don't need Genymotion, just create a new Virtual Device and while selecting the system Image select the ABI as armeabi instead of the default x86 one.

enter image description here

How to select Python version in PyCharm?

This can also happen in Intellij Ultimate, which has PyCharm integrated. The issue is as diagnosed above, you have the wrong interpreter selected.

The exact method to fix this for any given project is to go to Project Settings...Project and adjust the Project SDK. You can add a New Project SDK if you don't have Python 3 added by navigating to the python3 binary. This will fix the errors listed above. A shortcut to Project Settings is the blue checkerboard-type icon.

You can also add Python 3 as the default interpreter for Python projects. On OSX this is in File..Other Settings...Default Project Structure. There you can set the Project SDK which will now apply on each new project. It can be different on other platforms, but still similar.

Is there a better way to run a command N times in bash?

for run in {1..10}; do
  command
done

Or as a one-liner for those that want to copy and paste easily:

for run in {1..10}; do command; done

If your ranage has variable use this syntax ref

count=10
for i in $(seq $count); do
    command
done

Shell script to set environment variables

Run the script as source= to run in debug mode as well.

source= ./myscript.sh

How to change the height of a div dynamically based on another div using css?

I don't believe you can accomplish that with css. Originally javascript was designed for this. Try this:

<div class="div1" id="div1">
  <div class="div2">
    Div2 starts <br /><br /><br /><br /><br /><br /><br />
    Div2 ends
  </div>
  <div class="div3" id="div3">
    Div3
  </div>
</div>

and javascript function:

function adjustHeight() {
    document.getElementById('div3').style.height = document.defaultView.getComputedStyle(document.getElementById('div1'), "").getPropertyValue("height");
}

call the javascript after the div1 (or whole page) is loaded.

You can also replace document.getElementById('div3').style.height with code manipulating class div3 since my code only add / change style attribute of an element.

Hope this helps.

BULK INSERT with identity (auto-increment) column

  1. Create a table with Identity column + other columns;
  2. Create a view over it and expose only the columns you will bulk insert;
  3. BCP in the view

Can I use Homebrew on Ubuntu?

You can just follow instructions from the Homebrew on Linux docs, but I think it is better to understand what the instructions are trying to achieve.

Understanding the installation steps can save some time


Step 1: Choose location

First of all, it is important to understand that linuxbrew will be installed on the /home directory and not inside /home/your-user (the ~ directory).
(See the reason for that at the end of answer).
Keep this in mind when you run the other steps below.

Step 2: Add linuxbrew binaries to /home :

The installation script will do it for us:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Step 3: Check that /linuxbrew was added to the relevant location

This can be done by simply navigating to /home.
Notice that the docs are showing it as a one-liner by adding test -d <linuxbrew location> before each command.

(Read more about the test command in here).

Step 4: Export relevant environment variables to terminal

We need to add linuxbrew to PATH and add some more environment variables to the current terminal.

We can just add the following exports to terminal (wait don't do it..):

export PATH="/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin${PATH+:$PATH}";

export HOMEBREW_PREFIX="/home/linuxbrew/.linuxbrew";
export HOMEBREW_CELLAR="/home/linuxbrew/.linuxbrew/Cellar";
export HOMEBREW_REPOSITORY="/home/linuxbrew/.linuxbrew/Homebrew";
export MANPATH="/home/linuxbrew/.linuxbrew/share/man${MANPATH+:$MANPATH}:";
export INFOPATH="/home/linuxbrew/.linuxbrew/share/info:${INFOPATH:-}";

Or simply run (If your linuxbrew folder is on other location then /home - change the path):

eval $(/home/linuxbrew/.linuxbrew/bin/brew shellenv)

(*) Because brew command is not yet identified by the current terminal (this is what we're solving right now) we'll have to specify the full path to the brew binary: /home/linuxbrew/.linuxbrew/bin/brew shellenv

Test this step by:

1 ) Run brew from current terminal to see if it identifies the command.

2 ) Run printenv and check if all environment variables were exported and that you see /home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin on PATH.

Step 5: Ensure step 4 is running on each terminal

We need to add step 4 to ~/.profile (in case of Debian/Ubuntu):

echo "eval \$($(brew --prefix)/bin/brew shellenv)" >> ~/.profile

For CentOS/Fedora/Red Hat - replace ~/.profile with ~/.bash_profile.

Step 6: Ensure that ~/.profile or ~/.bash_profile are being executed when new terminal is opened

If you executed step 5 and failed to run brew from new terminal - add a test command like echo "Hi!" to ~/.profile or ~/.bash_profile.
If you don't see Hi! when you open a new terminal - go to the terminal preferences and ensure that the attribute of 'run command as login shell' is set.
Read more in here.


Why the installation script installs Homebrew to /home/linuxbrew/.linuxbrew - from here:

The installation script installs Homebrew to /home/linuxbrew/.linuxbrew using sudo if possible and in your home directory at ~/.linuxbrew otherwise. Homebrew does not use sudo after installation.
Using /home/linuxbrew/.linuxbrew allows the use of more binary packages (bottles) than installing in your personal home directory.

The prefix /home/linuxbrew/.linuxbrew was chosen so that users without admin access can ask an admin to create a linuxbrew role account and still benefit from precompiled binaries.

If you do not yourself have admin privileges, consider asking your admin staff to create a linuxbrew role account for you with home directory /home/linuxbrew.

List an Array of Strings in alphabetical order

Arrays.sort(stringArray); This sorts the string array based on the Unicode characters values. All strings that contain uppercase characters at the beginning of the string will be at the top of the sorted list alphabetically followed by all strings with lowercase characters. Hence if the array contains strings beginning with both uppercase characters and lowercase characters, the sorted array would not return a case insensitive order alphabetical list

String[] strArray = { "Carol", "bob", "Alice" };
Arrays.sort(strList);
System.out.println(Arrays.toString(hotel));

Output is : Alice, Carol, bob,

If you require the Strings to be sorted without regards to case, you'll need a second argument, a Comparator, for Arrays.sort(). Such a comparator has already been written for us and can be accessed as a static on the String class named CASE_INSENSITIVE_ORDER.

String[] strArray = { "Carol", "bob", "Alice" };
Arrays.sort(stringArray, String.CASE_INSENSITIVE_ORDER);
System.out.println(Arrays.toString(strArray ));

Output is : Alice, bob, Carol

Sort objects in ArrayList by date?

Pass the ArrayList In argument.

    private static void order(ArrayList<Object> list) {

    Collections.sort(list, new Comparator() {

        public int compare(Object o2, Object o1) {

            String x1 =  o1.Date;
            String x2 =  o2.Date;

                return  x1.compareTo(x2);

        }
    });
}

Google Maps V3 marker with label

The way to do this without use of plugins is to make a subclass of google's OverlayView() method.

https://developers.google.com/maps/documentation/javascript/reference?hl=en#OverlayView

You make a custom function and apply it to the map.

function Label() { 
    this.setMap(g.map);
};

Now you prototype your subclass and add HTML nodes:

Label.prototype = new google.maps.OverlayView; //subclassing google's overlayView
Label.prototype.onAdd = function() {
        this.MySpecialDiv               = document.createElement('div');
        this.MySpecialDiv.className     = 'MyLabel';
        this.getPanes().overlayImage.appendChild(this.MySpecialDiv); //attach it to overlay panes so it behaves like markers

}

you also have to implement remove and draw functions as stated in the API docs, or this won't work.

Label.prototype.onRemove = function() {
... // remove your stuff and its events if any
}
Label.prototype.draw = function() {
      var position = this.getProjection().fromLatLngToDivPixel(this.get('position')); // translate map latLng coords into DOM px coords for css positioning
var pos = this.get('position');
            $('.myLabel')
            .css({
                'top'   : position.y + 'px',
                'left'  : position.x + 'px'
            })
        ;
}

That's the gist of it, you'll have to do some more work in your specific implementation.

Uncaught (in promise) TypeError: Failed to fetch and Cors error

See mozilla.org's write-up on how CORS works.

You'll need your server to send back the proper response headers, something like:

Access-Control-Allow-Origin: http://foo.example
Access-Control-Allow-Methods: POST, PUT, GET, OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, Authorization

Bear in mind you can use "*" for Access-Control-Allow-Origin that will only work if you're trying to pass Authentication data. In that case, you need to explicitly list the origin domains you want to allow. To allow multiple domains, see this post

How to tell if a connection is dead in python

I translated the code sample in this blog post into Python: How to detect when the client closes the connection?, and it works well for me:

from ctypes import (
    CDLL, c_int, POINTER, Structure, c_void_p, c_size_t,
    c_short, c_ssize_t, c_char, ARRAY
)


__all__ = 'is_remote_alive',


class pollfd(Structure):
    _fields_ = (
        ('fd', c_int),
        ('events', c_short),
        ('revents', c_short),
    )


MSG_DONTWAIT = 0x40
MSG_PEEK = 0x02

EPOLLIN = 0x001
EPOLLPRI = 0x002
EPOLLRDNORM = 0x040

libc = CDLL(None)

recv = libc.recv
recv.restype = c_ssize_t
recv.argtypes = c_int, c_void_p, c_size_t, c_int

poll = libc.poll
poll.restype = c_int
poll.argtypes = POINTER(pollfd), c_int, c_int


class IsRemoteAlive:  # not needed, only for debugging
    def __init__(self, alive, msg):
        self.alive = alive
        self.msg = msg

    def __str__(self):
        return self.msg

    def __repr__(self):
        return 'IsRemoteClosed(%r,%r)' % (self.alive, self.msg)

    def __bool__(self):
        return self.alive


def is_remote_alive(fd):
    fileno = getattr(fd, 'fileno', None)
    if fileno is not None:
        if hasattr(fileno, '__call__'):
            fd = fileno()
        else:
            fd = fileno

    p = pollfd(fd=fd, events=EPOLLIN|EPOLLPRI|EPOLLRDNORM, revents=0)
    result = poll(p, 1, 0)
    if not result:
        return IsRemoteAlive(True, 'empty')

    buf = ARRAY(c_char, 1)()
    result = recv(fd, buf, len(buf), MSG_DONTWAIT|MSG_PEEK)
    if result > 0:
        return IsRemoteAlive(True, 'readable')
    elif result == 0:
        return IsRemoteAlive(False, 'closed')
    else:
        return IsRemoteAlive(False, 'errored')

What is the most "pythonic" way to iterate over a list in chunks?

There doesn't seem to be a pretty way to do this. Here is a page that has a number of methods, including:

def split_seq(seq, size):
    newseq = []
    splitsize = 1.0/size*len(seq)
    for i in range(size):
        newseq.append(seq[int(round(i*splitsize)):int(round((i+1)*splitsize))])
    return newseq

Hide Spinner in Input Number - Firefox 29

I mixed few answers from answers above and from How to remove the arrows from input[type="number"] in Opera in scss:

input[type=number] {
  &,
  &::-webkit-inner-spin-button,
  &::-webkit-outer-spin-button {
    -webkit-appearance: none;
    -moz-appearance: textfield;
    appearance: none;

    &:hover,
    &:focus {
      -moz-appearance: number-input;
    }
  }
}

Tested on chrome, firefox, safari

What does LayoutInflater in Android do?

LayoutInflater is a fundamental component in Android. You must use it all the time to turn xml files into view hierarchies.

How to Free Inode Usage?

On Raspberry Pi I had a problem with /var/cache/fontconfig dir with large number of files. Removing it took more than hour. And of couse rm -rf *.cache* raised Argument list too long error. I used below one

find . -name '*.cache*' | xargs rm -f

Python: access class property from string

x = getattr(self, source) will work just perfectly if source names ANY attribute of self, including the other_data in your example.

Run Batch File On Start-up

To run a batch file at start up: start >> all programs >> right-click startup >> open >> right click batch file >> create shortcut >> drag shortcut to startup folder.

The path to the folder is : [D|C]:\Profiles\{User}\??AppData\Roaming\Micro??soft\Windows\Start Menu\Programs\Startu??p

input checkbox true or checked or yes

Only checked and checked="checked" are valid. Your other options depend on error recovery in browsers.

checked="yes" and checked="true" are particularly bad as they imply that checked="no" and checked="false" will set the default state to be unchecked … which they will not.

How can I add new keys to a dictionary?

Here is an easy way!

your_dict = {}
your_dict['someKey'] = 'someValue'

This will add a new key: value pair in the your_dict dictionary with key = someKey and value = somevalue

You can also use this way to update the value of the key somekey if that already exists in the your_dict.

How can I install a .ipa file to my iPhone simulator

You can't. If it was downloaded via the iTunes store it was built for a different processor and won't work in the simulator.

org.apache.poi.POIXMLException: org.apache.poi.openxml4j.exceptions.InvalidFormatException:

You are trying to access an XLS file. However, you are using XSSFWorkbook and XSSFSheet class objects. These classes are mainly used for XLSX files.

For XLS file: HSSFWorkbook & HSSFSheet
For XLSX file: XSSFSheet & XSSFSheet

So in place of XSSFWorkbook use HSSFWorkbook and in place of XSSFSheet use HSSFSheet.

So your code should look like this after the changes are made:

HSSFWorkbook workbook = new HSSFWorkbook(file);

HSSFSheet sheet = workbook.getSheetAt(0);

batch file Copy files with certain extensions from multiple directories into one directory

Brandon, short and sweet. Also flexible.

set dSource=C:\Main directory\sub directory
set dTarget=D:\Documents
set fType=*.doc
for /f "delims=" %%f in ('dir /a-d /b /s "%dSource%\%fType%"') do (
    copy /V "%%f" "%dTarget%\" 2>nul
)

Hope this helps.

I would add some checks after the copy (using '||') but i'm not sure how "copy /v" reacts when it encounters an error.

you may want to try this:

copy /V "%%f" "%dTarget%\" 2>nul|| echo En error occured copying "%%F".&& exit /b 1

As the copy line. let me know if you get something out of it (in no position to test a copy failure atm..)

How to use sha256 in php5.3.0

First of all, sha256 is a hashing algorithm, not a type of encryption. An encryption would require having a way to decrypt the information back to its original value (collisions aside).

Looking at your code, it seems it should work if you are providing the correct parameter.

  • Try using a literal string in your code first, and verify its validity instead of using the $_POST[] variable

  • Try moving the comparison from the database query to the code (get the hash for the given user and compare to the hash you have just calculated)

But most importantly before deploying this in any kind of public fashion, please remember to sanitize your inputs. Don't allow arbitrary SQL to be insert into the queries. The best idea here would be to use parameterized queries.

Can I add and remove elements of enumeration at runtime in Java

I needed to do something like this (for unit testing purposes), and I came across this - the EnumBuster: http://www.javaspecialists.eu/archive/Issue161.html

It allows enum values to be added, removed and restored.

Edit: I've only just started using this, and found that there's some slight changes needed for java 1.5, which I'm currently stuck with:

  • Add array copyOf static helper methods (e.g. take these 1.6 versions: http://www.docjar.com/html/api/java/util/Arrays.java.html)
  • Change EnumBuster.undoStack to a Stack<Memento>
    • In undo(), change undoStack.poll() to undoStack.isEmpty() ? null : undoStack.pop();
  • The string VALUES_FIELD needs to be "ENUM$VALUES" for the java 1.5 enums I've tried so far

Change button background color using swift language

After you connect the UIButton that you want to change its background as an OUtlet to your ViewController.swift file you can use the following:

 yourUIButton.backgroundColor = UIColor.blue

keyword not supported data source

I was getting the same error, then updated my connection string as below,

<add name="EmployeeContext" connectionString="data source=*****;initial catalog=EmployeeDB;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />

Try this it will solve your issue.

Windows command to get service status?

Well I'm not sure about whether you can email the results of that from a batch file. If I may make an alternate suggestion that would solve your problem vbscript. I am far from great with vbscript but you can use it to query the services running on the local machine. The script below will email you the status of all of the services running on the machine the script gets run on. You'll obviously want to replace the smtp server and the email address. If you're part of a domain and you run this script as a privileged user (they have to be an administrator on the remote machine) you can query remote machines as well by replacing localhost with the fqdn.

Dim objComputer, objMessage
Dim strEmail

' If there is an error getting the status of a service it will attempt to move on to the next one
On Error Resume Next

' Email Setup
Set objMessage = CreateObject("CDO.Message")
objMessage.Subject = "Service Status Report"
objMessage.From = "[email protected]"
objMessage.To = "[email protected]"
objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/sendusing") = 2

'Name or IP of Remote SMTP Server
objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpserver") = "smtp.example.net"

'Server port (typically 25)
objMessage.Configuration.Fields.Item("http://schemas.microsoft.com/cdo/configuration/smtpserverport") = 25

Set objComputer = GetObject("WinNT://localhost")
objComputer.Filter = Array("Service")

For Each aService In objComputer
strEmail = strEmail &chr(10) & aService.Name & "=" & aService.Status
Next

objMessage.TextBody = strEmail
objMessage.Configuration.Fields.Update
objMessage.Send

Hope this helps you! Enjoy!

Edit: Ahh one more thing a service status of 4 means the service is running, a service status of 1 means it's not. I'm not sure what 2 or 3 means but I'm willing to bet they are stopping/starting.

How to convert a char to a String?

Try this: Character.toString(aChar) or just this: aChar + ""

Hide html horizontal but not vertical scrollbar

Using wrap=virtual in your HTML form boxes gets rid of the horizontal scrollbar at the bottom of the box:

  <textarea name= "enquiry" rows="4" cols="30" wrap="virtual"></textarea>

See example here : http://jsbin.com/opube3/2 (Tested on FF and IE)

Uncaught (in promise): Error: StaticInjectorError(AppModule)[options]

Faced the same error. In my case , what i did wrong was that i injected the service(named DataService in my case) inside the constructor within the Component but I simply forgot to import it within the component.

 constructor(private dataService:DataService ) {
    console.log("constructor called");
  }

I missed the below import code.

import { DataService } from '../../services/data.service';

nodejs vs node on ubuntu 12.04

Adding to @randunel's correct answer (can't yet comment on SO):

I also had to symlink /usr/local/bin/node to /usr/bin/nodejs as well.

sudo ln -s /usr/bin/nodejs /usr/local/bin/node

Apparently, this was overriding the /usr/bin/ node command.

No idea how that got set, but hope it helps someone else as it was a pain to figure out why the above wasn't working for me.

How to change the text of a button in jQuery?

To change the text in of a button simply execute the following line of jQuery for

<input type='button' value='XYZ' id='btnAddProfile'>

use

$("#btnAddProfile").val('Save');

while for

<button id='btnAddProfile'>XYZ</button>

use this

$("#btnAddProfile").html('Save');

Open URL in new window with JavaScript

Use window.open():

<a onclick="window.open(document.URL, '_blank', 'location=yes,height=570,width=520,scrollbars=yes,status=yes');">
  Share Page
</a>

This will create a link titled Share Page which opens the current url in a new window with a height of 570 and width of 520.

How to check if a string contains only digits in Java

Using regular expressions is costly in terms of performance. Trying to parse string as a long value is inefficient and unreliable, and may be not what you need.

What I suggest is to simply check if each character is a digit, what can be efficiently done using Java 8 lambda expressions:

boolean isNumeric = someString.chars().allMatch(x -> Character.isDigit(x));

How to make borders collapse (on a div)?

You could also use negative margins:

_x000D_
_x000D_
.column {_x000D_
  float: left;_x000D_
  overflow: hidden;_x000D_
  width: 120px;_x000D_
}_x000D_
.cell {_x000D_
  border: 1px solid red;_x000D_
  width: 120px;_x000D_
  height: 20px;_x000D_
  box-sizing: border-box;_x000D_
}_x000D_
.cell:not(:first-child) {_x000D_
  margin-top: -1px;_x000D_
}_x000D_
.column:not(:first-child) > .cell {_x000D_
  margin-left: -1px;_x000D_
}
_x000D_
<div class="container">_x000D_
  <div class="column">_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
  </div>_x000D_
  <div class="column">_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
  </div>_x000D_
  <div class="column">_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
  </div>_x000D_
  <div class="column">_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
  </div>_x000D_
  <div class="column">_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
    <div class="cell"></div>_x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to read XML response from a URL in java?

For xml parsing of an inputstream you can do:

// the SAX way:
XMLReader myReader = XMLReaderFactory.createXMLReader();
myReader.setContentHandler(handler);
myReader.parse(new InputSource(new URL(url).openStream()));

// or if you prefer DOM:
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new URL(url).openStream());

But to communicate over http from server to client I prefer using hessian library or springs http invoker lib

'No database provider has been configured for this DbContext' on SignInManager.PasswordSignInAsync

This is the solution i found.

https://github.com/aspnet/EntityFramework.Docs/blob/master/entity-framework/core/miscellaneous/configuring-dbcontext.md

Configure DBContext via AddDbContext

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<BloggingContext>(options => options.UseSqlite("Data Source=blog.db"));
}

Add new constructor to your DBContext class

public class BloggingContext : DbContext
{
    public BloggingContext(DbContextOptions<BloggingContext> options)
      :base(options)
    { }

    public DbSet<Blog> Blogs { get; set; }
}

Inject context to your controllers

public class MyController
{
    private readonly BloggingContext _context;

    public MyController(BloggingContext context)
    {
      _context = context;
    }

    ...
}

Flutter: RenderBox was not laid out

I had a similir problem, but in my case, I put a row in the leading of the ListView, and it was consuming all the space, of course. I just had to take the Row out of the leading, and it was solved. I would recommend to check if the problem is a larger widget than its container can have.

Expanded(child:MyListView())

How to make a redirection on page load in JSF 1.x

Assume that foo.jsp is your jsp file. and following code is the button that you want do redirect.

<h:commandButton value="Redirect" action="#{trial.enter }"/>  

And now we'll check the method for directing in your java (service) class

 public String enter() {
            if (userName.equals("xyz") && password.equals("123")) {
                return "enter";
            } else {
                return null;
            }
        } 

and now this is a part of faces-config.xml file

<managed-bean>
        <managed-bean-name>'class_name'</managed-bean-name>
        <managed-bean-class>'package_name'</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>


    <navigation-case>
                <from-outcome>enter</from-outcome>
                <to-view-id>/foo.jsp</to-view-id>
                <redirect />
            </navigation-case>

Best way to pass parameters to jQuery's .load()

As Davide Gualano has been told. This one

$("#myDiv").load("myScript.php?var=x&var2=y&var3=z")

use GET method for sending the request, and this one

$("#myDiv").load("myScript.php", {var:x, var2:y, var3:z})

use POST method for sending the request. But any limitation that is applied to each method (post/get) is applied to the alternative usages that has been mentioned in the question.

For example: url length limits the amount of sending data in GET method.

How to get the parent dir location

Here is another relatively simple solution that:

  • does not use dirname() (which does not work as expected on one level arguments like "file.txt" or relative parents like "..")
  • does not use abspath() (avoiding any assumptions about the current working directory) but instead preserves the relative character of paths

it just uses normpath and join:

def parent(p):
    return os.path.normpath(os.path.join(p, os.path.pardir))

# Example:
for p in ['foo', 'foo/bar/baz', 'with/trailing/slash/', 
        'dir/file.txt', '../up/', '/abs/path']:
    print parent(p)

Result:

.
foo/bar
with/trailing
dir
..
/abs

What's the difference between "Layers" and "Tiers"?

Layers refer to logical seperation of code. Logical layers help you organise your code better. For example an application can have the following layers.

1)Presentation Layer or UI Layer 2)Business Layer or Business Logic Layer 3)Data Access Layer or Data Layer

The aboove three layers reside in their own projects, may be 3 projects or even more. When we compile the projects we get the respective layer DLL. So we have 3 DLL's now.

Depending upon how we deploy our application, we may have 1 to 3 tiers. As we now have 3 DLL's, if we deploy all the DLL's on the same machine, then we have only 1 physical tier but 3 logical layers.

If we choose to deploy each DLL on a seperate machine, then we have 3 tiers and 3 layers.

So, Layers are a logical separation and Tiers are a physical separation. We can also say that, tiers are the physical deployment of layers.

Crystal Reports - Adding a parameter to a 'Command' query

Select Projecttname, ReleaseDate, TaskName From DB_Table Where Project_Name like '%{?Pm-?Proj_Name}%' and ReleaseDate >= currentdate

Note the single-quotes and wildcard characters. I just spent 30 minutes figuring out something similar.

Changing line colors with ggplot()

color and fill are separate aesthetics. Since you want to modify the color you need to use the corresponding scale:

d + scale_color_manual(values=c("#CC6666", "#9999CC"))

is what you want.

How to capitalize the first letter of a String in Java?

You may try this

/**
 * capitilizeFirst(null)  -> ""
 * capitilizeFirst("")    -> ""
 * capitilizeFirst("   ") -> ""
 * capitilizeFirst(" df") -> "Df"
 * capitilizeFirst("AS")  -> "As"
 *
 * @param str input string
 * @return String with the first letter capitalized
 */
public String capitilizeFirst(String str)
{
    // assumptions that input parameter is not null is legal, as we use this function in map chain
    Function<String, String> capFirst = (String s) -> {
        String result = ""; // <-- accumulator

        try { result += s.substring(0, 1).toUpperCase(); }
        catch (Throwable e) {}
        try { result += s.substring(1).toLowerCase(); }
        catch (Throwable e) {}

        return result;
    };

    return Optional.ofNullable(str)
            .map(String::trim)
            .map(capFirst)
            .orElse("");
}

difference between width auto and width 100 percent

Width auto

The initial width of a block level element like div or p is auto. This makes it expand to occupy all available horizontal space within its containing block. If it has any horizontal padding or border, the widths of those do not add to the total width of the element.

Width 100%

On the other hand, if you specify width:100%, the element’s total width will be 100% of its containing block plus any horizontal margin, padding and border (unless you’ve used box-sizing:border-box, in which case only margins are added to the 100% to change how its total width is calculated). This may be what you want, but most likely it isn’t.

To visualise the difference see this picture:

enter image description here

Source

Disable Tensorflow debugging information

for tensorflow 2.1.0, following code works fine.

import tensorflow as tf
tf.compat.v1.logging.set_verbosity(tf.compat.v1.logging.ERROR)

SQL - The conversion of a varchar data type to a datetime data type resulted in an out-of-range value

As you know this is UK format issue. You can do date conversion indirectly by using function.

CREATE FUNCTION  ChangeDateFormatFromUK
( 
   @DateColumn varchar(10)
)

RETURNS VARCHAR(10)
AS 
 BEGIN
    DECLARE @Year varchar(4), @Month varchar(2), @Day varchar(2), @Result varchar(10)
    SET @Year = (SELECT substring(@DateColumn,7,10))
    SET @Month = (SELECT substring(@DateColumn,4,5)) 
    SET @Day = (SELECT substring(@DateColumn,1,2))
   SET @Result  = @Year  + '/' @Month + '/' +  @Day

 RETURN @Result
END

To call this function

SELECT dbo.ChangeDateFormatFromUK([dates]) from table

Convert it normally to datetime

SELECT CONVERT(DATETIME,dbo.ChangeDateFormatFromUK([dates])) from table

In your Case, you can do

SELECT [dates] from table where CONVERT(DATETIME,dbo.ChangeDateFormatFromUK([dates])) > GetDate()   -- or any date

How to get position of a certain element in strings vector, to use it as an index in ints vector?

If you want an index, you can use std::find in combination with std::distance.

auto it = std::find(Names.begin(), Names.end(), old_name_);
if (it == Names.end())
{
  // name not in vector
} else
{
  auto index = std::distance(Names.begin(), it);
}

Rebasing remote branches in Git

You can disable the check (if you're really sure you know what you're doing) by using the --force option to git push.

Shuffling a list of objects

random.shuffle should work. Here's an example, where the objects are lists:

from random import shuffle
x = [[i] for i in range(10)]
shuffle(x)

# print(x)  gives  [[9], [2], [7], [0], [4], [5], [3], [1], [8], [6]]
# of course your results will vary

Note that shuffle works in place, and returns None.

Difference between `npm start` & `node app.js`, when starting app?

The documentation has been updated. My answer has substantial changes vs the accepted answer: I wanted to reflect documentation is up-to-date, and accepted answer has a few broken links.

Also, I didn't understand when the accepted answer said "it defaults to node server.js". I think the documentation clarifies the default behavior:

npm-start

Start a package

Synopsis

npm start [-- <args>]

Description

This runs an arbitrary command specified in the package's "start" property of its "scripts" object. If no "start" property is specified on the "scripts" object, it will run node server.js.

In summary, running npm start could do one of two things:

  1. npm start {command_name}: Run an arbitrary command (i.e. if such command is specified in the start property of package.json's scripts object)
  2. npm start: Else if no start property exists (or no command_name is passed): Run node server.js, (which may not be appropriate, for example the OP doesn't have server.js; the OP runs nodeapp.js )
  3. I said I would list only 2 items, but are other possibilities (i.e. error cases). For example, if there is no package.json in the directory where you run npm start, you may see an error: npm ERR! enoent ENOENT: no such file or directory, open '.\package.json'

ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?

You should write the pickled data with a lower protocol number in Python 3. Python 3 introduced a new protocol with the number 3 (and uses it as default), so switch back to a value of 2 which can be read by Python 2.

Check the protocolparameter in pickle.dump. Your resulting code will look like this.

pickle.dump(your_object, your_file, protocol=2)

There is no protocolparameter in pickle.load because pickle can determine the protocol from the file.

How do you add an in-app purchase to an iOS application?

Swift Answer

This is meant to supplement my Objective-C answer for Swift users, to keep the Objective-C answer from getting too big.

Setup

First, set up the in-app purchase on appstoreconnect.apple.com. Follow the beginning part of my Objective-C answer (steps 1-13, under the App Store Connect header) for instructions on doing that.

It could take a few hours for your product ID to register in App Store Connect, so be patient.

Now that you've set up your in-app purchase information on App Store Connect, we need to add Apple's framework for in-app-purchases, StoreKit, to the app.

Go into your Xcode project, and go to the application manager (blue page-like icon at the top of the left bar where your app's files are). Click on your app under targets on the left (it should be the first option), then go to "Capabilities" at the top. On the list, you should see an option "In-App Purchase". Turn this capability ON, and Xcode will add StoreKit to your project.

Coding

Now, we're going to start coding!

First, make a new swift file that will manage all of your in-app-purchases. I'm going to call it IAPManager.swift.

In this file, we're going to create a new class, called IAPManager that is a SKProductsRequestDelegate and SKPaymentTransactionObserver. At the top, make sure you import Foundation and StoreKit

import Foundation
import StoreKit

public class IAPManager: NSObject, SKProductsRequestDelegate,
                         SKPaymentTransactionObserver {
}

Next, we're going to add a variable to define the identifier for our in-app purchase (you could also use an enum, which would be easier to maintain if you have multiple IAPs).

// This should the ID of the in-app-purchase you made on AppStore Connect.
// if you have multiple IAPs, you'll need to store their identifiers in
// other variables, too (or, preferably in an enum).
let removeAdsID = "com.skiplit.removeAds"

Let's add an initializer for our class next:

// This is the initializer for your IAPManager class
//
// A better, and more scaleable way of doing this
// is to also accept a callback in the initializer, and call
// that callback in places like the paymentQueue function, and
// in all functions in this class, in place of calls to functions
// in RemoveAdsManager (you'll see those calls in the code below).

let productID: String
init(productID: String){
    self.productID = productID
}

Now, we're going to add the required functions for SKProductsRequestDelegate and SKPaymentTransactionObserver to work:

We'll add the RemoveAdsManager class later

// This is called when a SKProductsRequest receives a response
public func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse){
    // Let's try to get the first product from the response
    // to the request
    if let product = response.products.first{
        // We were able to get the product! Make a new payment
        // using this product
        let payment = SKPayment(product: product)

        // add the new payment to the queue
        SKPaymentQueue.default().add(self)
        SKPaymentQueue.default().add(payment)
    }
    else{
        // Something went wrong! It is likely that either
        // the user doesn't have internet connection, or
        // your product ID is wrong!
        //
        // Tell the user in requestFailed() by sending an alert,
        // or something of the sort

        RemoveAdsManager.removeAdsFailure()
    }
}

// This is called when the user restores their IAP sucessfully
private func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue){
    // For every transaction in the transaction queue...
    for transaction in queue.transactions{
        // If that transaction was restored
        if transaction.transactionState == .restored{
            // get the producted ID from the transaction
            let productID = transaction.payment.productIdentifier

            // In this case, we have only one IAP, so we don't need to check
            // what IAP it is. However, this is useful if you have multiple IAPs!
            // You'll need to figure out which one was restored
            if(productID.lowercased() == IAPManager.removeAdsID.lowercased()){
                // Restore the user's purchases
                RemoveAdsManager.restoreRemoveAdsSuccess()
            }

            // finish the payment
            SKPaymentQueue.default().finishTransaction(transaction)
        }
    }
}

// This is called when the state of the IAP changes -- from purchasing to purchased, for example.
// This is where the magic happens :)
public func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]){
    for transaction in transactions{
        // get the producted ID from the transaction
        let productID = transaction.payment.productIdentifier

        // In this case, we have only one IAP, so we don't need to check
        // what IAP it is.
        // However, if you have multiple IAPs, you'll need to use productID
        // to check what functions you should run here!

        switch transaction.transactionState{
        case .purchasing:
            // if the user is currently purchasing the IAP,
            // we don't need to do anything.
            //
            // You could use this to show the user
            // an activity indicator, or something like that
            break
        case .purchased:
            // the user successfully purchased the IAP!
            RemoveAdsManager.removeAdsSuccess()
            SKPaymentQueue.default().finishTransaction(transaction)
        case .restored:
                // the user restored their IAP!
                IAPTestingHandler.restoreRemoveAdsSuccess()
                SKPaymentQueue.default().finishTransaction(transaction)
        case .failed:
                // The transaction failed!
                RemoveAdsManager.removeAdsFailure()
                // finish the transaction
                SKPaymentQueue.default().finishTransaction(transaction)
        case .deferred:
                // This happens when the IAP needs an external action
                // in order to proceeded, like Ask to Buy
                RemoveAdsManager.removeAdsDeferred()
                break
        }
    }
}

Now let's add some functions that can be used to start a purchase or a restore purchases:

// Call this when you want to begin a purchase
// for the productID you gave to the initializer
public func beginPurchase(){
    // If the user can make payments
    if SKPaymentQueue.canMakePayments(){
        // Create a new request
        let request = SKProductsRequest(productIdentifiers: [productID])
        // Set the request delegate to self, so we receive a response
        request.delegate = self
        // start the request
        request.start()
    }
    else{
        // Otherwise, tell the user that
        // they are not authorized to make payments,
        // due to parental controls, etc
    }
}

// Call this when you want to restore all purchases
// regardless of the productID you gave to the initializer
public func beginRestorePurchases(){
    // restore purchases, and give responses to self
    SKPaymentQueue.default().add(self)
    SKPaymentQueue.default().restoreCompletedTransactions()
}

Next, let's add a new utilities class to manage our IAPs. All of this code could be in one class, but having it multiple makes it a little cleaner. I'm going to make a new class called RemoveAdsManager, and in it, put a few functions

public class RemoveAdsManager{

    class func removeAds()
    class func restoreRemoveAds()

    class func areAdsRemoved() -> Bool

    class func removeAdsSuccess()
    class func restoreRemoveAdsSuccess()
    class func removeAdsDeferred()
    class func removeAdsFailure()
}

The first three functions, removeAds, restoreRemoveAds, and areAdsRemoved, are functions that you'll call to do certain actions. The last four are one that will be called by IAPManager.

Let's add some code to the first two functions, removeAds and restoreRemoveAds:

// Call this when the user wants
// to remove ads, like when they
// press a "remove ads" button
class func removeAds(){
    // Before starting the purchase, you could tell the
    // user that their purchase is happening, maybe with
    // an activity indicator

    let iap = IAPManager(productID: IAPManager.removeAdsID)
    iap.beginPurchase()
}

// Call this when the user wants
// to restore their IAP purchases,
// like when they press a "restore
// purchases" button.
class func restoreRemoveAds(){
    // Before starting the purchase, you could tell the
    // user that the restore action is happening, maybe with
    // an activity indicator

    let iap = IAPManager(productID: IAPManager.removeAdsID)
    iap.beginRestorePurchases()
}

And lastly, let's add some code to the last five functions.

// Call this to check whether or not
// ads are removed. You can use the
// result of this to hide or show
// ads
class func areAdsRemoved() -> Bool{
    // This is the code that is run to check
    // if the user has the IAP.

    return UserDefaults.standard.bool(forKey: "RemoveAdsPurchased")
}

// This will be called by IAPManager
// when the user sucessfully purchases
// the IAP
class func removeAdsSuccess(){
    // This is the code that is run to actually
    // give the IAP to the user!
    //
    // I'm using UserDefaults in this example,
    // but you may want to use Keychain,
    // or some other method, as UserDefaults
    // can be modified by users using their
    // computer, if they know how to, more
    // easily than Keychain

    UserDefaults.standard.set(true, forKey: "RemoveAdsPurchased")
    UserDefaults.standard.synchronize()
}

// This will be called by IAPManager
// when the user sucessfully restores
//  their purchases
class func restoreRemoveAdsSuccess(){
    // Give the user their IAP back! Likely all you'll need to
    // do is call the same function you call when a user
    // sucessfully completes their purchase. In this case, removeAdsSuccess()

    removeAdsSuccess()
}

// This will be called by IAPManager
// when the IAP failed
class func removeAdsFailure(){
    // Send the user a message explaining that the IAP
    // failed for some reason, and to try again later
}

// This will be called by IAPManager
// when the IAP gets deferred.
class func removeAdsDeferred(){
    // Send the user a message explaining that the IAP
    // was deferred, and pending an external action, like
    // Ask to Buy.
}

Putting it all together, we get something like this:

import Foundation
import StoreKit

public class RemoveAdsManager{

    // Call this when the user wants
    // to remove ads, like when they
    // press a "remove ads" button
    class func removeAds(){
        // Before starting the purchase, you could tell the
        // user that their purchase is happening, maybe with
        // an activity indicator

        let iap = IAPManager(productID: IAPManager.removeAdsID)
        iap.beginPurchase()
    }

    // Call this when the user wants
    // to restore their IAP purchases,
    // like when they press a "restore
    // purchases" button.
    class func restoreRemoveAds(){
        // Before starting the purchase, you could tell the
        // user that the restore action is happening, maybe with
        // an activity indicator

        let iap = IAPManager(productID: IAPManager.removeAdsID)
        iap.beginRestorePurchases()
    }

    // Call this to check whether or not
    // ads are removed. You can use the
    // result of this to hide or show
    // ads
    class func areAdsRemoved() -> Bool{
        // This is the code that is run to check
        // if the user has the IAP.

        return UserDefaults.standard.bool(forKey: "RemoveAdsPurchased")
    }

    // This will be called by IAPManager
    // when the user sucessfully purchases
    // the IAP
    class func removeAdsSuccess(){
        // This is the code that is run to actually
        // give the IAP to the user!
        //
        // I'm using UserDefaults in this example,
        // but you may want to use Keychain,
        // or some other method, as UserDefaults
        // can be modified by users using their
        // computer, if they know how to, more
        // easily than Keychain

        UserDefaults.standard.set(true, forKey: "RemoveAdsPurchased")
        UserDefaults.standard.synchronize()
    }

    // This will be called by IAPManager
    // when the user sucessfully restores
    //  their purchases
    class func restoreRemoveAdsSuccess(){
        // Give the user their IAP back! Likely all you'll need to
        // do is call the same function you call when a user
        // sucessfully completes their purchase. In this case, removeAdsSuccess()
        removeAdsSuccess()
    }

    // This will be called by IAPManager
    // when the IAP failed
    class func removeAdsFailure(){
        // Send the user a message explaining that the IAP
        // failed for some reason, and to try again later
    }

    // This will be called by IAPManager
    // when the IAP gets deferred.
    class func removeAdsDeferred(){
        // Send the user a message explaining that the IAP
        // was deferred, and pending an external action, like
        // Ask to Buy.
    }

}

public class IAPManager: NSObject, SKProductsRequestDelegate, SKPaymentTransactionObserver{

    // This should the ID of the in-app-purchase you made on AppStore Connect.
    // if you have multiple IAPs, you'll need to store their identifiers in
    // other variables, too (or, preferably in an enum).
    static let removeAdsID = "com.skiplit.removeAds"

    // This is the initializer for your IAPManager class
    //
    // An alternative, and more scaleable way of doing this
    // is to also accept a callback in the initializer, and call
    // that callback in places like the paymentQueue function, and
    // in all functions in this class, in place of calls to functions
    // in RemoveAdsManager.
    let productID: String
    init(productID: String){
        self.productID = productID
    }

    // Call this when you want to begin a purchase
    // for the productID you gave to the initializer
    public func beginPurchase(){
        // If the user can make payments
        if SKPaymentQueue.canMakePayments(){
            // Create a new request
            let request = SKProductsRequest(productIdentifiers: [productID])
            request.delegate = self
            request.start()
        }
        else{
            // Otherwise, tell the user that
            // they are not authorized to make payments,
            // due to parental controls, etc
        }
    }

    // Call this when you want to restore all purchases
    // regardless of the productID you gave to the initializer
    public func beginRestorePurchases(){
        SKPaymentQueue.default().add(self)
        SKPaymentQueue.default().restoreCompletedTransactions()
    }

    // This is called when a SKProductsRequest receives a response
    public func productsRequest(_ request: SKProductsRequest, didReceive response: SKProductsResponse){
        // Let's try to get the first product from the response
        // to the request
        if let product = response.products.first{
            // We were able to get the product! Make a new payment
            // using this product
            let payment = SKPayment(product: product)

            // add the new payment to the queue
            SKPaymentQueue.default().add(self)
            SKPaymentQueue.default().add(payment)
        }
        else{
            // Something went wrong! It is likely that either
            // the user doesn't have internet connection, or
            // your product ID is wrong!
            //
            // Tell the user in requestFailed() by sending an alert,
            // or something of the sort

            RemoveAdsManager.removeAdsFailure()
        }
    }

    // This is called when the user restores their IAP sucessfully
    private func paymentQueueRestoreCompletedTransactionsFinished(_ queue: SKPaymentQueue){
        // For every transaction in the transaction queue...
        for transaction in queue.transactions{
            // If that transaction was restored
            if transaction.transactionState == .restored{
                // get the producted ID from the transaction
                let productID = transaction.payment.productIdentifier

                // In this case, we have only one IAP, so we don't need to check
                // what IAP it is. However, this is useful if you have multiple IAPs!
                // You'll need to figure out which one was restored
                if(productID.lowercased() == IAPManager.removeAdsID.lowercased()){
                    // Restore the user's purchases
                    RemoveAdsManager.restoreRemoveAdsSuccess()
                }

                // finish the payment
                SKPaymentQueue.default().finishTransaction(transaction)
            }
        }
    }

    // This is called when the state of the IAP changes -- from purchasing to purchased, for example.
    // This is where the magic happens :)
    public func paymentQueue(_ queue: SKPaymentQueue, updatedTransactions transactions: [SKPaymentTransaction]){
        for transaction in transactions{
            // get the producted ID from the transaction
            let productID = transaction.payment.productIdentifier

            // In this case, we have only one IAP, so we don't need to check
            // what IAP it is.
            // However, if you have multiple IAPs, you'll need to use productID
            // to check what functions you should run here!

            switch transaction.transactionState{
            case .purchasing:
                // if the user is currently purchasing the IAP,
                // we don't need to do anything.
                //
                // You could use this to show the user
                // an activity indicator, or something like that
                break
            case .purchased:
                // the user sucessfully purchased the IAP!
                RemoveAdsManager.removeAdsSuccess()
                SKPaymentQueue.default().finishTransaction(transaction)
            case .restored:
                // the user restored their IAP!
                RemoveAdsManager.restoreRemoveAdsSuccess()
                SKPaymentQueue.default().finishTransaction(transaction)
            case .failed:
                // The transaction failed!
                RemoveAdsManager.removeAdsFailure()
                // finish the transaction
                SKPaymentQueue.default().finishTransaction(transaction)
            case .deferred:
                // This happens when the IAP needs an external action
                // in order to proceeded, like Ask to Buy
                RemoveAdsManager.removeAdsDeferred()
                break
            }
        }
    }

}

Lastly, you need to add some way for the user to start the purchase and call RemoveAdsManager.removeAds() and start a restore and call RemoveAdsManager.restoreRemoveAds(), like a button somewhere! Keep in mind that, per the App Store guidelines, you do need to provide a button to restore purchases somewhere.

Submitting for review

The last thing to do is submit your IAP for review on App Store Connect! For detailed instructions on doing that, you can follow the last part of my Objective-C answer, under the Submitting for review header.

Hide HTML element by id

If you want to do it via javascript rather than CSS you can use:

var link = document.getElementById('nav-ask');
link.style.display = 'none'; //or
link.style.visibility = 'hidden';

depending on what you want to do.

Java: Most efficient method to iterate over all elements in a org.w3c.dom.Document?

I also stumbled over this problem recently. Here is my solution. I wanted to avoid recursion, so I used a while loop.

Because of the adds and removes in arbitrary places on the list, I went with the LinkedList implementation.

/* traverses tree starting with given node */
  private static List<Node> traverse(Node n)
  {
    return traverse(Arrays.asList(n));
  }

  /* traverses tree starting with given nodes */
  private static List<Node> traverse(List<Node> nodes)
  {
    List<Node> open = new LinkedList<Node>(nodes);
    List<Node> visited = new LinkedList<Node>();

    ListIterator<Node> it = open.listIterator();
    while (it.hasNext() || it.hasPrevious())
    {
      Node unvisited;
      if (it.hasNext())
        unvisited = it.next();
      else
        unvisited = it.previous();

      it.remove();

      List<Node> children = getChildren(unvisited);
      for (Node child : children)
        it.add(child);

      visited.add(unvisited);
    }

    return visited;
  }

  private static List<Node> getChildren(Node n)
  {
    List<Node> children = asList(n.getChildNodes());
    Iterator<Node> it = children.iterator();
    while (it.hasNext())
      if (it.next().getNodeType() != Node.ELEMENT_NODE)
        it.remove();
    return children;
  }

  private static List<Node> asList(NodeList nodes)
  {
    List<Node> list = new ArrayList<Node>(nodes.getLength());
    for (int i = 0, l = nodes.getLength(); i < l; i++)
      list.add(nodes.item(i));
    return list;
  }

Why I cannot cout a string?

Above answers are good but If you do not want to add string include, you can use the following

ostream& operator<<(ostream& os, string& msg)
{
os<<msg.c_str();

return os;
}

Fade In Fade Out Android Animation in Java

I really like Vitaly Zinchenkos solution since it was short.

Here is an even briefer version in kotlin for a simple fade out

viewToAnimate?.alpha = 1f
viewToAnimate?.animate()
             ?.alpha(0f)
             ?.setDuration(1000)
             ?.setInterpolator(DecelerateInterpolator())
             ?.start()

How do I dynamically set the selected option of a drop-down list using jQuery, JavaScript and HTML?

Pardon my ignorance, but why are you using $('.salesperson') instead of $('#salesperson') when dealing with an ID?

CALL command vs. START with /WAIT option

This is an old thread, but I have just encountered this situation and discovered a neat way around it. I was trying to run a setup.exe, but the focus was returning to the next line of the script without waiting for the setup.exe to finish. I tried the above solutions with no luck.

In the end, piping the command through more did the trick.

setup.exe {arguments} | more

How to create a showdown.js markdown extension

In your last block you have a comma after 'lang', followed immediately with a function. This is not valid json.

EDIT

It appears that the readme was incorrect. I had to to pass an array with the string 'twitter'.

var converter = new Showdown.converter({extensions: ['twitter']}); converter.makeHtml('whatever @meandave2020'); // output "<p>whatever <a href="http://twitter.com/meandave2020">@meandave2020</a></p>" 

I submitted a pull request to update this.

How do I check if I'm running on Windows in Python?

Are you using platform.system?

 system()
        Returns the system/OS name, e.g. 'Linux', 'Windows' or 'Java'.

        An empty string is returned if the value cannot be determined.

If that isn't working, maybe try platform.win32_ver and if it doesn't raise an exception, you're on Windows; but I don't know if that's forward compatible to 64-bit, since it has 32 in the name.

win32_ver(release='', version='', csd='', ptype='')
        Get additional version information from the Windows Registry
        and return a tuple (version,csd,ptype) referring to version
        number, CSD level and OS type (multi/single
        processor).

But os.name is probably the way to go, as others have mentioned.


For what it's worth, here's a few of the ways they check for Windows in platform.py:

if sys.platform == 'win32':
#---------
if os.environ.get('OS','') == 'Windows_NT':
#---------
try: import win32api
#---------
# Emulation using _winreg (added in Python 2.0) and
# sys.getwindowsversion() (added in Python 2.3)
import _winreg
GetVersionEx = sys.getwindowsversion
#----------
def system():

    """ Returns the system/OS name, e.g. 'Linux', 'Windows' or 'Java'.    
        An empty string is returned if the value cannot be determined.   
    """
    return uname()[0]

Git credential helper - update password

None of these answers ended up working for my Git credential issue. Here is what did work if anyone needs it (I'm using Git 1.9 on Windows 8.1).

To update your credentials, go to Control PanelCredential ManagerGeneric Credentials. Find the credentials related to your Git account and edit them to use the updated password.

Reference: How to update your Git credentials on Windows

Note that to use the Windows Credential Manager for Git you need to configure the credential helper like so:

git config --global credential.helper wincred

If you have multiple GitHub accounts that you use for different repositories, then you should configure credentials to use the full repository path (rather than just the domain, which is the default):

git config --global credential.useHttpPath true

How to get a vCard (.vcf file) into Android contacts from website

Just to let you know: I just tried it using a vCard 2.1 file created according to the vCard 2.1 spec. I found that vCard 2.1, despite being an old version, already covered everything I needed, including a base64-encoded photo and international character sets.

It worked perfectly on my unmodified Android 4.1.1 device (Galaxy S3). It also worked on an old iPhone 3GS (iOS 5, via the Evernote app) and a coworker's unmodified old Android 2.1 device. You only need to set the Content-disposition to attachment as suggested above.

A minor problem was that I triggered the VCF download using a QR code, which I scanned with the Microsoft Tag app. That app told me Android couldn't handle the text/x-vcard media type (or just text/vcard, no matter). Once I opened the link in a Web browser (I tried Chrome and the Android default browser), it worked fine.

Visual Studio 2010 always thinks project is out of date, but nothing has changed

In my case one of the projects contains multiple IDL files. The MIDL compiler generates a DLL data file called 'dlldata.c' for each of them, regardless of the IDL file name. This caused Visual Studio to compile the IDL files on every build, even without changes to any of the IDL files.

The workaround is to configure a unique output file for each IDL file (the MIDL compiler always generates such a file, even if the /dlldata switch is omitted):

  • Right-click the IDL file
  • Select Properties - MIDL - Output
  • Enter a unique file name for the DllData File property

Reading from a text file and storing in a String

How can we read data from a text file and store in a String Variable?

Err, read data from the file and store it in a String variable. It's just code. Not a real question so far.

Is it possible to pass the filename in a method and it would return the String which is the text from the file.

Yes it's possible. It's also a very bad idea. You should deal with the file a part at a time, for example a line at a time. Reading the entire file into memory before you process any of it adds latency; wastes memory; and assumes that the entire file will fit into memory. One day it won't. You don't want to do it this way.

Add event handler for body.onload by javascript within <body> part

As @epascarello mentioned for W3C standard browsers, you should use:

body.addEventListener("load", init, false);

However, if you want it to work on IE<9 as well you can use:

var prefix = window.addEventListener ? "" : "on";
var eventName = window.addEventListener ? "addEventListener" : "attachEvent";
document.body[eventName](prefix + "load", init, false);

Or if you want it in a single line:

document.body[window.addEventListener ? 'addEventListener' : 'attachEvent'](
    window.addEventListener ? "load" : "onload", init, false);

Note: here I get a straight reference to the body element via the document, saving the need for the first line.

Also, if you're using jQuery, and you want to use the DOM ready event rather than when the body loads, the answer can be even shorter...

$(init);

Can't bind to 'formControl' since it isn't a known property of 'input' - Angular2 Material Autocomplete issue

Forget trying to decipher the example .ts - as others have said it is often incomplete.

Instead just click on the 'pop-out' icon circled here and you'll get a fully working StackBlitz example.

enter image description here

You can quickly confirm the required modules:

enter image description here

Comment out any instances of ReactiveFormsModule, and sure enough you'll get the error:

Template parse errors:
Can't bind to 'formControl' since it isn't a known property of 'input'. 

Why should the static field be accessed in a static way?

Because ... it (MILLISECONDS) is a static field (hiding in an enumeration, but that's what it is) ... however it is being invoked upon an instance of the given type (but see below as this isn't really true1).

javac will "accept" that, but it should really be MyUnits.MILLISECONDS (or non-prefixed in the applicable scope).

1 Actually, javac "rewrites" the code to the preferred form -- if m happened to be null it would not throw an NPE at run-time -- it is never actually invoked upon the instance).

Happy coding.


I'm not really seeing how the question title fits in with the rest :-) More accurate and specialized titles increase the likely hood the question/answers can benefit other programmers.

how to permit an array with strong parameters

when you want to permit multiple array fields you will have to list array fields at last while permitting ,as given -

params.require(:questions).permit(:question, :user_id, answers: [], selected_answer: [] )

(this works)

When you use 'badidea' or 'thisisunsafe' to bypass a Chrome certificate/HSTS error, does it only apply for the current site?

This is specific for each site. So if you type that once, you will only get through that site and all other sites will need a similar type-through.

It is also remembered for that site and you have to click on the padlock to reset it (so you can type it again):

enter image description here

Needless to say use of this "feature" is a bad idea and is unsafe - hence the name.

You should find out why the site is showing the error and/or stop using it until they fix it. HSTS specifically adds protections for bad certs to prevent you clicking through them. The fact it's needed suggests there is something wrong with the https connection - like the site or your connection to it has been hacked.

The chrome developers also do change this periodically. They changed it recently from badidea to thisisunsafe so everyone using badidea, suddenly stopped being able to use it. You should not depend on it. As Steffen pointed out in the comments below, it is available in the code should it change again though they now base64 encode it to make it more obscure. The last time they changed they put this comment in the commit:

Rotate the interstitial bypass keyword

The security interstitial bypass keyword hasn't changed in two years and awareness of the bypass has been increased in blogs and social media. Rotate the keyword to help prevent misuse.

I think the message from the Chrome team is clear - you should not use it. It would not surprise me if they removed it completely in future.

If you are using this when using a self-signed certificate for local testing then why not just add your self-signed certificate certificate to your computer's certificate store so you get a green padlock and do not have to type this? Note Chrome insists on a SAN field in certificates now so if just using the old subject field then even adding it to the certificate store will not result in a green padlock.

If you leave the certificate untrusted then certain things do not work. Caching for example is completely ignored for untrusted certificates. As is HTTP/2 Push.

HTTPS is here to stay and we need to get used to using it properly - and not bypassing the warnings with a hack that is liable to change and doesn't work the same as a full HTTPS solution.

c# .net change label text

  Label label1 = new System.Windows.Forms.Label
//label1.Text = "test";
    if (Request.QueryString["ID"] != null)
    {

        string test = Request.QueryString["ID"];
        label1.Text = "Du har nu lånat filmen:" + test;
    }

   else
    {

        string test = Request.QueryString["ID"];
        label1.Text = "test";
    }

This should make it

Alternative to deprecated getCellType

You can use:

cell.getCellTypeEnum()

Further to compare the cell type, you have to use CellType as follows:-

if(cell.getCellTypeEnum() == CellType.STRING){
      .
      .
      .
}

You can Refer to the documentation. Its pretty helpful:-

https://poi.apache.org/apidocs/org/apache/poi/ss/usermodel/Cell.html

How can I delete using INNER JOIN with SQL Server?

You don't specify the tables for Company and Date, and you might want to fix that.

Standard SQL using MERGE:

MERGE WorkRecord2 T
   USING Employee S
      ON T.EmployeeRun = S.EmployeeNo
         AND Company = '1'
         AND Date = '2013-05-06'
WHEN MATCHED THEN DELETE;

The answer from Devart is also standard SQL, though incomplete. It should look more like this:

DELETE
  FROM WorkRecord2
  WHERE EXISTS ( SELECT *
                   FROM Employee S
                  WHERE S.EmployeeNo = WorkRecord2.EmployeeRun
                        AND Company = '1'
                        AND Date = '2013-05-06' );

The important thing to note about the above is it is clear the delete is targeting a single table, as enforced in the second example by requiring a scalar subquery.

For me, the various proprietary syntax answers are harder to read and understand. I guess the mindset for is best described in the answer by frans eilering, i.e. the person writing the code doesn't necessarily care about the person who will read and maintain the code.

How to confirm RedHat Enterprise Linux version?

That is the release version of RHEL, or at least the release of RHEL from which the package supplying /etc/redhat-release was installed. A file like that is probably the closest you can come; you could also look at /etc/lsb-release.

It is theoretically possible to have packages installed from a mix of versions (e.g. upgrading part of the system to 5.5 while leaving other parts at 5.4), so if you depend on the versions of specific components you will need to check for those individually.

Using XAMPP, how do I swap out PHP 5.3 for PHP 5.2?

Thanks for the answer. I just got this working on Windows XP, with a few modifications. Here are my steps.

  1. Download and install latest xampp to G:\xampp. As of 2010/03/12, this is 1.7.3.
  2. Download the zip of xampp-win32-1.7.0.zip, which is the latest xampp distro without php 5.3. Extract somewhere, e.g. G:\xampp-win32-1.7.0\
  3. Remove directory G:\xampp\php
  4. Remove G:\xampp\apache\modules\php5apache2_2.dll and php5apache2_2_filter.dll
  5. Copy G:\xampp-win32-1.7.0\xampp\php to G:\xampp\php.
  6. Copy G:\xampp-win32-1.7.0\xampp\apache\bin\php* to G:\xampp\apache\bin
  7. Edit G:\xampp\apache\conf\extra\httpd-xampp.conf.
    • Immediately after the line, <IfModule alias_module> add the lines

(snip)

<IfModule mime_module>
  LoadModule php5_module "/xampp/apache/bin/php5apache2_2.dll"
  AddType application/x-httpd-php-source .phps
  AddType application/x-httpd-php .php .php5 .php4 .php3 .phtml .phpt
    <Directory "/xampp/htdocs/xampp">
      <IfModule php5_module>
        <Files "status.php">
            php_admin_flag safe_mode off
        </Files>
      </IfModule>
    </Directory>
</IfModule>

(Note that this is taken from the same file in the 1.7.0 xampp distribution. If you run into trouble, check that conf file and make the new one match it.)

You should then be able to start the apache server with PHP 5.2.8. You can tail the G:\xampp\apache\logs\error.log file to see whether there are any errors on startup. If not, you should be able to see the XAMPP splash screen when you navigate to localhost.

Hope this helps the next guy.

cheers,

Jake

Round double value to 2 decimal places

In Swift 2.0 and Xcode 7.2:

let pi:Double = 3.14159265358979
String(format:"%.2f", pi)

Example:

enter image description here

Adding Text to DataGridView Row Header

I think it should be:

dataGridView1.Columns[0].HeaderCell.Value = "my text";

Remove all special characters with RegExp

Note that if you still want to exclude a set, including things like slashes and special characters you can do the following:

var outString = sourceString.replace(/[`~!@#$%^&*()_|+\-=?;:'",.<>\{\}\[\]\\\/]/gi, '');

take special note that in order to also include the "minus" character, you need to escape it with a backslash like the latter group. if you don't it will also select 0-9 which is probably undesired.

How to update SQLAlchemy row entry?

Examples to clarify the important issue in accepted answer's comments

I didn't understand it until I played around with it myself, so I figured there would be others who were confused as well. Say you are working on the user whose id == 6 and whose no_of_logins == 30 when you start.

# 1 (bad)
user.no_of_logins += 1
# result: UPDATE user SET no_of_logins = 31 WHERE user.id = 6

# 2 (bad)
user.no_of_logins = user.no_of_logins + 1
# result: UPDATE user SET no_of_logins = 31 WHERE user.id = 6

# 3 (bad)
setattr(user, 'no_of_logins', user.no_of_logins + 1)
# result: UPDATE user SET no_of_logins = 31 WHERE user.id = 6

# 4 (ok)
user.no_of_logins = User.no_of_logins + 1
# result: UPDATE user SET no_of_logins = no_of_logins + 1 WHERE user.id = 6

# 5 (ok)
setattr(user, 'no_of_logins', User.no_of_logins + 1)
# result: UPDATE user SET no_of_logins = no_of_logins + 1 WHERE user.id = 6

The point

By referencing the class instead of the instance, you can get SQLAlchemy to be smarter about incrementing, getting it to happen on the database side instead of the Python side. Doing it within the database is better since it's less vulnerable to data corruption (e.g. two clients attempt to increment at the same time with a net result of only one increment instead of two). I assume it's possible to do the incrementing in Python if you set locks or bump up the isolation level, but why bother if you don't have to?

A caveat

If you are going to increment twice via code that produces SQL like SET no_of_logins = no_of_logins + 1, then you will need to commit or at least flush in between increments, or else you will only get one increment in total:

# 6 (bad)
user.no_of_logins = User.no_of_logins + 1
user.no_of_logins = User.no_of_logins + 1
session.commit()
# result: UPDATE user SET no_of_logins = no_of_logins + 1 WHERE user.id = 6

# 7 (ok)
user.no_of_logins = User.no_of_logins + 1
session.flush()
# result: UPDATE user SET no_of_logins = no_of_logins + 1 WHERE user.id = 6
user.no_of_logins = User.no_of_logins + 1
session.commit()
# result: UPDATE user SET no_of_logins = no_of_logins + 1 WHERE user.id = 6

Invoke or BeginInvoke cannot be called on a control until the window handle has been created

It's possible that you're creating your controls on the wrong thread. Consider the following documentation from MSDN:

This means that InvokeRequired can return false if Invoke is not required (the call occurs on the same thread), or if the control was created on a different thread but the control's handle has not yet been created.

In the case where the control's handle has not yet been created, you should not simply call properties, methods, or events on the control. This might cause the control's handle to be created on the background thread, isolating the control on a thread without a message pump and making the application unstable.

You can protect against this case by also checking the value of IsHandleCreated when InvokeRequired returns false on a background thread. If the control handle has not yet been created, you must wait until it has been created before calling Invoke or BeginInvoke. Typically, this happens only if a background thread is created in the constructor of the primary form for the application (as in Application.Run(new MainForm()), before the form has been shown or Application.Run has been called.

Let's see what this means for you. (This would be easier to reason about if we saw your implementation of SafeInvoke also)

Assuming your implementation is identical to the referenced one with the exception of the check against IsHandleCreated, let's follow the logic:

public static void SafeInvoke(this Control uiElement, Action updater, bool forceSynchronous)
{
    if (uiElement == null)
    {
        throw new ArgumentNullException("uiElement");
    }

    if (uiElement.InvokeRequired)
    {
        if (forceSynchronous)
        {
            uiElement.Invoke((Action)delegate { SafeInvoke(uiElement, updater, forceSynchronous); });
        }
        else
        {
            uiElement.BeginInvoke((Action)delegate { SafeInvoke(uiElement, updater, forceSynchronous); });
        }
    }
    else
    {    
        if (uiElement.IsDisposed)
        {
            throw new ObjectDisposedException("Control is already disposed.");
        }

        updater();
    }
}

Consider the case where we're calling SafeInvoke from the non-gui thread for a control whose handle has not been created.

uiElement is not null, so we check uiElement.InvokeRequired. Per the MSDN docs (bolded) InvokeRequired will return false because, even though it was created on a different thread, the handle hasn't been created! This sends us to the else condition where we check IsDisposed or immediately proceed to call the submitted action... from the background thread!

At this point, all bets are off re: that control because its handle has been created on a thread that doesn't have a message pump for it, as mentioned in the second paragraph. Perhaps this is the case you're encountering?

HTML span align center not working?

Span is inline-block and adjusts to inline text size, with a tenacity that blocks most efforts to style out of inline context. To simplify layout style (limit conflicts), add div to 'p' tag with line break.

<p> some default stuff
<br>
<div style="text-align: center;"> your entered stuff </div>

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

From your stack trace, EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) occurred because dispatch_group_t was released while it was still locking (waiting for dispatch_group_leave).

According to what you found, this was what happened :

  • dispatch_group_t group was created. group's retain count = 1.
  • -[self webservice:onCompletion:] captured the group. group's retain count = 2.
  • dispatch_async(...., ^{ dispatch_group_wait(group, ...) ... }); captured the group again. group's retain count = 3.
  • Exit the current scope. group was released. group's retain count = 2.
  • dispatch_group_leave was never called.
  • dispatch_group_wait was timeout. The dispatch_async block was completed. group was released. group's retain count = 1.
  • You called this method again. When -[self webservice:onCompletion:] was called again, the old onCompletion block was replaced with the new one. So, the old group was released. group's retain count = 0. group was deallocated. That resulted to EXC_BAD_INSTRUCTION.

To fix this, I suggest you should find out why -[self webservice:onCompletion:] didn't call onCompletion block, and fix it. Then make sure the next call to the method will happen after the previous call did finish.


In case you allow the method to be called many times whether the previous calls did finish or not, you might find someone to hold group for you :

  • You can change the timeout from 2 seconds to DISPATCH_TIME_FOREVER or a reasonable amount of time that all -[self webservice:onCompletion] should call their onCompletion blocks by the time. So that the block in dispatch_async(...) will hold it for you.
    OR
  • You can add group into a collection, such as NSMutableArray.

I think it is the best approach to create a dedicate class for this action. When you want to make calls to webservice, you then create an object of the class, call the method on it with the completion block passing to it that will release the object. In the class, there is an ivar of dispatch_group_t or dispatch_semaphore_t.

Increment counter with loop

You can use varStatus in your c:forEach loop

In your first example you can get the counter to work properly as follows...

<c:forEach var="tableEntity" items='${requestScope.tables}'>
   <c:forEach var="rowEntity" items='${tableEntity.rows}' varStatus="count">            
        my count is ${count.count}
    </c:forEach>
</c:forEach>

Python - Count elements in list

To find count of unique elements of list use the combination of len() and set().

>>> ls = [1, 2, 3, 4, 1, 1, 2]
>>> len(ls)
7
>>> len(set(ls))
4

Getting a File's MD5 Checksum in Java

The com.google.common.hash API offers:

  • A unified user-friendly API for all hash functions
  • Seedable 32- and 128-bit implementations of murmur3
  • md5(), sha1(), sha256(), sha512() adapters, change only one line of code to switch between these, and murmur.
  • goodFastHash(int bits), for when you don't care what algorithm you use
  • General utilities for HashCode instances, like combineOrdered / combineUnordered

Read the User Guide (IO Explained, Hashing Explained).

For your use-case Files.hash() computes and returns the digest value for a file.

For example a digest calculation (change SHA-1 to MD5 to get MD5 digest)

HashCode hc = Files.asByteSource(file).hash(Hashing.sha1());
"SHA-1: " + hc.toString();

Note that is much faster than , so use if you do not need a cryptographically secure checksum. Note also that should not be used to store passwords and the like since it is to easy to brute force, for passwords use , or instead.

For long term protection with hashes a Merkle signature scheme adds to the security and The Post Quantum Cryptography Study Group sponsored by the European Commission has recommended use of this cryptography for long term protection against quantum computers (ref).

Note that has a higher collision rate than the others.

How to set xampp open localhost:8080 instead of just localhost

you can get loccalhost page by writing localhost/xampp or by writing http://127.0.0.1 you will get the local host page. After starting the apache serve that can be from wamp, xamp or lamp.

ffmpeg - Converting MOV files to MP4

The command to just stream it to a new container (mp4) needed by some applications like Adobe Premiere Pro without encoding (fast) is:

ffmpeg -i input.mov -qscale 0 output.mp4

Alternative as mentioned in the comments, which re-encodes with best quaility (-qscale 0):

ffmpeg -i input.mov -q:v 0 output.mp4

Disable arrow key scrolling in users browser

For maintainability, I would attach the "blocking" handler on the element itself (in your case, the canvas).

theCanvas.onkeydown = function (e) {
    if (e.key === 'ArrowUp' || e.key === 'ArrowDown') {
        e.view.event.preventDefault();
    }
}

Why not simply do window.event.preventDefault()? MDN states:

window.event is a proprietary Microsoft Internet Explorer property which is only available while a DOM event handler is being called. Its value is the Event object currently being handled.

Further readings:

Set a border around a StackPanel.

You set DockPanel.Dock="Top" to the StackPanel, but the StackPanel is not a child of the DockPanel... the Border is. Your docking property is being ignored.

If you move DockPanel.Dock="Top" to the Border instead, both of your problems will be fixed :)

Is a DIV inside a TD a bad idea?

Two ways of dealing with it

  1. put div inside tbody tag
  2. put div inside tr tag

Both approaches are valid, if you see feference: https://stackoverflow.com/a/23440419/2305243

Spring Boot - How to log all requests and responses with exceptions in single place?

Please refer to below link for actual answer https://gist.github.com/int128/e47217bebdb4c402b2ffa7cc199307ba

Made some changes from above referred solution , request and response will log in console and in file too if logger level is info. we can print either in console or file.

@Component
public class LoggingFilter extends OncePerRequestFilter {

private static final List<MediaType> VISIBLE_TYPES = Arrays.asList(
        MediaType.valueOf("text/*"),
        MediaType.APPLICATION_FORM_URLENCODED,
        MediaType.APPLICATION_JSON,
        MediaType.APPLICATION_XML,
        MediaType.valueOf("application/*+json"),
        MediaType.valueOf("application/*+xml"),
        MediaType.MULTIPART_FORM_DATA
        );
Logger log = LoggerFactory.getLogger(ReqAndResLoggingFilter.class);
private static final Path path = Paths.get("/home/ramesh/loggerReq.txt");
private static BufferedWriter writer = null;
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
    try {
        writer = Files.newBufferedWriter(path, Charset.forName("UTF-8"));
    if (isAsyncDispatch(request)) {
        filterChain.doFilter(request, response);
    } else {
        doFilterWrapped(wrapRequest(request), wrapResponse(response), filterChain);
    }
    }finally {
        writer.close();
    }
}

protected void doFilterWrapped(ContentCachingRequestWrapper request, ContentCachingResponseWrapper response, FilterChain filterChain) throws ServletException, IOException {
    try {
        beforeRequest(request, response);
        filterChain.doFilter(request, response);
    }
    finally {
        afterRequest(request, response);
        response.copyBodyToResponse();
    }
}

protected void beforeRequest(ContentCachingRequestWrapper request, ContentCachingResponseWrapper response) throws IOException {
    if (log.isInfoEnabled()) {
        logRequestHeader(request, request.getRemoteAddr() + "|>");
    }
}

protected void afterRequest(ContentCachingRequestWrapper request, ContentCachingResponseWrapper response) throws IOException {
    if (log.isInfoEnabled()) {
        logRequestBody(request, request.getRemoteAddr() + "|>");
        logResponse(response, request.getRemoteAddr() + "|<");
    }
}

private void logRequestHeader(ContentCachingRequestWrapper request, String prefix) throws IOException {
    String queryString = request.getQueryString();
    if (queryString == null) {
        printLines(prefix,request.getMethod(),request.getRequestURI());
        log.info("{} {} {}", prefix, request.getMethod(), request.getRequestURI());
    } else {
        printLines(prefix,request.getMethod(),request.getRequestURI(),queryString);
        log.info("{} {} {}?{}", prefix, request.getMethod(), request.getRequestURI(), queryString);
    }
    Collections.list(request.getHeaderNames()).forEach(headerName ->
    Collections.list(request.getHeaders(headerName)).forEach(headerValue ->
    log.info("{} {}: {}", prefix, headerName, headerValue)));
    printLines(prefix);
    printLines(RequestContextHolder.currentRequestAttributes().getSessionId());
    log.info("{}", prefix);

    log.info(" Session ID: ", RequestContextHolder.currentRequestAttributes().getSessionId());
}

private void printLines(String ...args) throws IOException {

    try {
    for(String varArgs:args) {
            writer.write(varArgs);
            writer.newLine();
    }
        }catch(IOException ex){
            ex.printStackTrace();
    }

}

private void logRequestBody(ContentCachingRequestWrapper request, String prefix) {
    byte[] content = request.getContentAsByteArray();
    if (content.length > 0) {
        logContent(content, request.getContentType(), request.getCharacterEncoding(), prefix);
    }
}

private void logResponse(ContentCachingResponseWrapper response, String prefix) throws IOException {
    int status = response.getStatus();
    printLines(prefix, String.valueOf(status), HttpStatus.valueOf(status).getReasonPhrase());
    log.info("{} {} {}", prefix, status, HttpStatus.valueOf(status).getReasonPhrase());
    response.getHeaderNames().forEach(headerName ->
    response.getHeaders(headerName).forEach(headerValue ->
    log.info("{} {}: {}", prefix, headerName, headerValue)));
    printLines(prefix);
    log.info("{}", prefix);
    byte[] content = response.getContentAsByteArray();
    if (content.length > 0) {
        logContent(content, response.getContentType(), response.getCharacterEncoding(), prefix);
    }
}

private void logContent(byte[] content, String contentType, String contentEncoding, String prefix) {
    MediaType mediaType = MediaType.valueOf(contentType);
    boolean visible = VISIBLE_TYPES.stream().anyMatch(visibleType -> visibleType.includes(mediaType));
    if (visible) {
        try {
            String contentString = new String(content, contentEncoding);
            Stream.of(contentString.split("\r\n|\r|\n")).forEach(line -> {
                try {
                    printLines(line);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            });
//              log.info("{} {}", prefix, line));
        } catch (UnsupportedEncodingException e) {
            log.info("{} [{} bytes content]", prefix, content.length);
        }
    } else {

        log.info("{} [{} bytes content]", prefix, content.length);
    }
}

private static ContentCachingRequestWrapper wrapRequest(HttpServletRequest request) {
    if (request instanceof ContentCachingRequestWrapper) {
        return (ContentCachingRequestWrapper) request;
    } else {
        return new ContentCachingRequestWrapper(request);
    }
}

private static ContentCachingResponseWrapper wrapResponse(HttpServletResponse response) {
    if (response instanceof ContentCachingResponseWrapper) {
        return (ContentCachingResponseWrapper) response;
    } else {
        return new ContentCachingResponseWrapper(response);
    }
}
} 

Output in File:

127.0.0.1|>
POST
/createUser
127.0.0.1|>
session Id:C0793464532E7F0C7154913CBA018B2B
Request:
{
  "name": "asdasdas",
  "birthDate": "2018-06-21T17:11:15.679+0000"
}
127.0.0.1|<
200
OK
127.0.0.1|<
Response:
{"name":"asdasdas","birthDate":"2018-06-21T17:11:15.679+0000","id":4}

How can I send an HTTP POST request to a server from Excel using VBA?

Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP")
URL = "http://www.somedomain.com"
objHTTP.Open "POST", URL, False
objHTTP.setRequestHeader "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
objHTTP.send("")

Alternatively, for greater control over the HTTP request you can use WinHttp.WinHttpRequest.5.1 in place of MSXML2.ServerXMLHTTP.

How to detect shake event with android?

Dont forget to add this code in your MainActivity.java:

MainActivity.java

mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
    public void onShake() {
        Toast.makeText(MainActivity.this, "Shake " , Toast.LENGTH_LONG).show();        
    }
});

@Override
protected void onResume() {
    super.onResume();
    mShaker.resume();
}

@Override
protected void onPause() {
    super.onPause();
    mShaker.pause();
}

Or I give you a link about this stuff.

How can I get customer details from an order in WooCommerce?

Having tried $customer = new WC_Customer(); and global $woocommerce; $customer = $woocommerce->customer; I was still getting empty address data even when I logged in as a non-admin user.

My solution was as follows:

function mwe_get_formatted_shipping_name_and_address($user_id) {

    $address = '';
    $address .= get_user_meta( $user_id, 'shipping_first_name', true );
    $address .= ' ';
    $address .= get_user_meta( $user_id, 'shipping_last_name', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_company', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_address_1', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_address_2', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_city', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_state', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_postcode', true );
    $address .= "\n";
    $address .= get_user_meta( $user_id, 'shipping_country', true );

    return $address;
}

...and this code works regardless of whether you are logged in as admin or not.

How can I get the data type of a variable in C#?

Just hold cursor over member you interested in, and see tooltip - it will show memeber's type:

enter image description here

How do I reference a cell range from one worksheet to another using excel formulas?

I rewrote the code provided by Ninja2k because I didn't like that it looped through cells. For future reference here's a version using arrays instead which works noticeably faster over lots of ranges but has the same result:

Function concat2(useThis As Range, Optional delim As String) As String
    Dim tempValues
    Dim tempString
    Dim numValues As Long
    Dim i As Long, j As Long
    tempValues = useThis
    numValues = UBound(tempValues) * UBound(tempValues, 2)
    ReDim values(1 To numValues)
    For i = UBound(tempValues) To LBound(tempValues) Step -1
        For j = UBound(tempValues, 2) To LBound(tempValues, 2) Step -1
            values(numValues) = tempValues(i, j)
            numValues = numValues - 1
        Next j
    Next i
    concat2 = Join(values, delim)
End Function

I can't help but think there's definitely a better way...

Here are steps to do it manually without VBA which only works with 1d arrays and makes static values instead of retaining the references:

  1. Update cell formula to something like =Sheet2!A1:A15
  2. Hit F9
  3. Remove the curly braces { and }
  4. Place CONCATENATE( at the front of the formula after the = sign and ) at the end of the formula.
  5. Hit enter.

includes() not working in all browsers

In my case i found better to use "string.search".

var str = "Some very very very long string";
var n = str.search("very");

In case it would be helpful for someone.

JQuery find first parent element with specific class prefix

Jquery later allowed you to to find the parents with the .parents() method.

Hence I recommend using:

var $div = $('#divid').parents('div[class^="div-a"]');

This gives all parent nodes matching the selector. To get the first parent matching the selector use:

var $div = $('#divid').parents('div[class^="div-a"]').eq(0);

For other such DOM traversal queries, check out the documentation on traversing the DOM.

What does 'synchronized' mean?

In java to prevent multiple threads manipulating a shared variable we use synchronized keyword. Lets understand it with help of the following example:

In the example I have defined two threads and named them increment and decrement. Increment thread increases the value of shared variable (counter) by the same amount the decrement thread decreases it i.e 5000 times it is increased (which result in 5000 + 0 = 5000) and 5000 times we decrease (which result in 5000 - 5000 = 0).

Program without synchronized keyword:

class SynchronizationDemo {

    public static void main(String[] args){

        Buffer buffer = new Buffer();                   

        MyThread incThread = new MyThread(buffer, "increment");
        MyThread decThread = new MyThread(buffer, "decrement"); 

        incThread.start();
        decThread.start();  
       
        try {
          incThread.join();
          decThread.join();
        }catch(InterruptedException e){ }

        System.out.println("Final counter: "+buffer.getCounter());
    }
}

class Buffer {
    private int counter = 0; 
    public void inc() { counter++; }
    public void dec() { counter--; } 
    public int getCounter() { return counter; }
}

class MyThread extends Thread {

    private String name;
    private Buffer buffer;

    public MyThread (Buffer aBuffer, String aName) {            
        buffer = aBuffer; 
        name = aName; 
    }

    public void run(){
        for (int i = 0; i <= 5000; i++){
            if (name.equals("increment"))
                buffer.inc();
            else
                buffer.dec();                           
        }
    }
}

If we run the above program we expect value of buffer to be same since incrementing and decrementing the buffer by same amount would result in initial value we started with right ?. Lets see the output:

enter image description here

As you can see no matter how many times we run the program we get a different result reason being each thread manipulated the counter at the same time. If we could manage to let the one thread to first increment the shared variable and then second to decrement it or vice versa we will then get the right result that is exactly what can be done with synchronized keyword by just adding synchronized keyword before the inc and dec methods of Buffer like this:

Program with synchronized keyword:

// rest of the code

class Buffer {
    private int counter = 0; 
    // added synchronized keyword to let only one thread
    // be it inc or dec thread to manipulate data at a time
    public synchronized void inc() { counter++; }
    public synchronized void dec() { counter--; } 
    public int getCounter() { return counter; }
}

// rest of the code

and the output:

enter image description here

no matter how many times we run it we get the same output as 0

Is it really impossible to make a div fit its size to its content?

You can use:

width: -webkit-fit-content;
height: -webkit-fit-content;
width: -moz-fit-content;
height: -moz-fit-content;

EDIT: No. see http://red-team-design.com/horizontal-centering-using-css-fit-content-value/

ALSO: http://dev.w3.org/csswg/css-box-3/

Is there an alternative to string.Replace that is case-insensitive?

Expanding on C. Dragon 76's popular answer by making his code into an extension that overloads the default Replace method.

public static class StringExtensions
{
    public static string Replace(this string str, string oldValue, string newValue, StringComparison comparison)
    {
        StringBuilder sb = new StringBuilder();

        int previousIndex = 0;
        int index = str.IndexOf(oldValue, comparison);
        while (index != -1)
        {
            sb.Append(str.Substring(previousIndex, index - previousIndex));
            sb.Append(newValue);
            index += oldValue.Length;

            previousIndex = index;
            index = str.IndexOf(oldValue, index, comparison);
        }
        sb.Append(str.Substring(previousIndex));
        return sb.ToString();
     }
}

Annotations from javax.validation.constraints not working

So @Valid at service interface would work for only that object. If you have any more validations within the hierarchy of ServiceRequest object then you might to have explicitly trigger validations. So this is how I have done it:

public class ServiceRequestValidator {

      private static Validator validator;

      @PostConstruct
      public void init(){
         validator = Validation.buildDefaultValidatorFactory().getValidator();
      }

      public static <T> void validate(T t){
        Set<ConstraintViolation<T>> errors = validator.validate(t);
        if(CollectionUtils.isNotEmpty(errors)){
          throw new ConstraintViolationException(errors);
        }
     }

}

You need to have following annotations at the object level if you want to trigger validation for that object.

@Valid
@NotNull

How to change the integrated terminal in visual studio code or VSCode

Probably it is too late but the below thing worked for me:

  1. Open Settings --> this will open settings.json
  2. type terminal.integrated.windows.shell
  3. Click on {} at the top right corner -- this will open an editor where this setting can be over ridden.
  4. Set the value as terminal.integrated.windows.shell: C:\\Users\\<user_name>\\Softwares\\Git\\bin\\bash.exe
  5. Click Ctrl + S

Try to open new terminal. It should open in bash editor in integrated mode.

Lock screen orientation (Android)

I had a similar problem.

When I entered

<activity android:name="MyActivity" android:screenOrientation="landscape"></activity>

In the manifest file this caused that activity to display in landscape. However when I returned to previous activities they displayed in lanscape even though they were set to portrait. However by adding

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

immediately after the OnCreate section of the target activity resolved the problem. So I now use both methods.

Get keys from HashMap in Java

You can retrieve all of the Map's keys using the method keySet(). Now, if what you need is to get a key given its value, that's an entirely different matter and Map won't help you there; you'd need a specialized data structure, like BidiMap (a map that allows bidirectional lookup between key and values) from Apache's Commons Collections - also be aware that several different keys could be mapped to the same value.

Pass variable to function in jquery AJAX success callback

I've meet the probleme recently. The trouble is coming when the filename lenght is greather than 20 characters. So the bypass is to change your filename length, but the trick is also a good one.

$.ajaxSetup({async: false}); // passage en mode synchrone
$.ajax({
   url: pathpays,
   success: function(data) {
      //debug(data);
      $(data).find("a:contains(.png),a:contains(.jpg)").each(function() {
         var image = $(this).attr("href");
         // will loop through
         debug("Found a file: " + image);
         text +=  '<img class="arrondie" src="' + pathpays + image + '" />';
      });
      text = text + '</div>';
      //debug(text);
   }
});

After more investigation the trouble is coming from ajax request: Put an eye to the html code returned by ajax:

<a href="Paris-Palais-de-la-cite%20-%20Copie.jpg">Paris-Palais-de-la-c..&gt;</a>
</td>
<td align="right">2015-09-05 09:50 </td>
<td align="right">4.3K</td>
<td>&nbsp;</td>
</tr>

As you can see the filename is splitted after the character 20, so the $(data).find("a:contains(.png)) is not able to find the correct extention.

But if you check the value of the href parameter it contents the fullname of the file.

I dont know if I can to ask to ajax to return the full filename in the text area?

Hope to be clear

I've found the right test to gather all files:

$(data).find("[href$='.jpg'],[href$='.png']").each(function() {  
var image = $(this).attr("href");

Convert string (without any separator) to list

A python string is a list of characters. You can iterate over it right now!

justdigits = ""
for char in string:
    if char.isdigit():
        justdigits += str(char)

How can I make IntelliJ IDEA update my dependencies from Maven?

It turns out IntelliJ does not pick up added dependencies from the local Maven repository. We have to tell IntelliJ to reimport the pom.xml.

  1. Open the project view in IntelliJ
  2. Right click the pom.xml file and select Maven - Reimport
  3. If this works for you IntelliJ will add the dependencies to the project
  4. Check the if the dependencies you need are added in
    • File - Project Structure - Project Settings - Libraries
    • and File - Project Structure - Modules - Dependencies

What is 'PermSize' in Java?

This blog post gives a nice explanation and some background. Basically, the "permanent generation" (whose size is given by PermSize) is used to store things that the JVM has to allocate space for, but which will not (normally) be garbage-collected (hence "permanent") (+). That means for example loaded classes and static fields.

There is also a FAQ on garbage collection directly from Sun, which answers some questions about the permanent generation. Finally, here's a blog post with a lot of technical detail.

(+) Actually parts of the permanent generation will be GCed, e.g. class objects will be removed when a class is unloaded. But that was uncommon when the permanent generation was introduced into the JVM, hence the name.

What does %w(array) mean?

%W and %w allow you to create an Array of strings without using quotes and commas.

Repeat string to certain length

def repeat_to_length(string_to_expand, length):
   return (string_to_expand * ((length/len(string_to_expand))+1))[:length]

For python3:

def repeat_to_length(string_to_expand, length):
    return (string_to_expand * (int(length/len(string_to_expand))+1))[:length]

How to change Toolbar home icon color

Instead of style changes, just put these two lines of code to your activity.

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.arrowleft);

How can I get just the first row in a result set AFTER ordering?

This question is similar to How do I limit the number of rows returned by an Oracle query after ordering?.

It talks about how to implement a MySQL limit on an oracle database which judging by your tags and post is what you are using.

The relevant section is:

select *
from  
  ( select * 
  from emp 
  order by sal desc ) 
  where ROWNUM <= 5;

Creating an object: with or without `new`

The first allocates an object with automatic storage duration, which means it will be destructed automatically upon exit from the scope in which it is defined.

The second allocated an object with dynamic storage duration, which means it will not be destructed until you explicitly use delete to do so.

Cell spacing in UICollectionView

Simple code for spacing

let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
layout.minimumInteritemSpacing = 10 // Some float value

generate days from date range

MSSQL Query

select datetable.Date 
from (
    select DATEADD(day,-(a.a + (10 * b.a) + (100 * c.a)),getdate()) AS Date
    from (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4
     union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a

    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4
     union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b

    cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4
     union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c
) datetable
where datetable.Date between '2014-01-20' and '2014-01-24' 
order by datetable.Date DESC

Output

Date
-----
2014-01-23 12:35:25.250
2014-01-22 12:35:25.250
2014-01-21 12:35:25.250
2014-01-20 12:35:25.250

Killing a process using Java

Accidentally i stumbled upon another way to do a force kill on Unix (for those who use Weblogic). This is cheaper and more elegant than running /bin/kill -9 via Runtime.exec().

import weblogic.nodemanager.util.Platform;
import weblogic.nodemanager.util.ProcessControl;
...
ProcessControl pctl = Platform.getProcessControl();
pctl.killProcess(pid);

And if you struggle to get the pid, you can use reflection on java.lang.UNIXProcess, e.g.:

Process proc = Runtime.getRuntime().exec(cmdarray, envp);
if (proc instanceof UNIXProcess) {
    Field f = proc.getClass().getDeclaredField("pid");
    f.setAccessible(true);
    int pid = f.get(proc);
}

What's the idiomatic syntax for prepending to a short python list?

In my opinion, the most elegant and idiomatic way of prepending an element or list to another list, in Python, is using the expansion operator * (also called unpacking operator),

# Initial list
l = [4, 5, 6]

# Modification
l = [1, 2, 3, *l]

Where the resulting list after the modification is [1, 2, 3, 4, 5, 6]

I also like simply combining two lists with the operator +, as shown,

# Prepends [1, 2, 3] to l
l = [1, 2, 3] + l

# Prepends element 42 to l
l = [42] + l

I don't like the other common approach, l.insert(0, value), as it requires a magic number. Moreover, insert() only allows prepending a single element, however the approach above has the same syntax for prepending a single element or multiple elements.

change Oracle user account status from EXPIRE(GRACE) to OPEN

Compilation from jonearles' answer, http://kishantha.blogspot.com/2010/03/oracle-enterprise-manager-console.html and http://blog.flimatech.com/2011/07/17/changing-oracle-password-in-11g-using-alter-user-identified-by-values/ (Oracle 11g):

To stop this happening in the future do the following.

  • Login to sqlplus as sysdba -> sqlplus "/as sysdba"
  • Execute ->ALTER PROFILE DEFAULT LIMIT FAILED_LOGIN_ATTEMPTS UNLIMITED PASSWORD_LIFE_TIME UNLIMITED;

To reset users' status, run the query:

select
'alter user ' || su.name || ' identified by values'
   || ' ''' || spare4 || ';'    || su.password || ''';'
from sys.user$ su 
join dba_users du on ACCOUNT_STATUS like 'EXPIRED%' and su.name = du.username;

and execute some or all of the result set.