SyntaxFix

Programs & Examples On #Dynamically generated co

JPA Hibernate One-to-One relationship

I have a better way of doing this:

@Entity
public class Person {

    @OneToOne(cascade={javax.persistence.CascadeType.ALL})
    @JoinColumn(name = "`Id_OtherInfo`")
    public OtherInfo getOtherInfo() {
      return otherInfo;
    }

}

That's all

How to set size for local image using knitr for markdown?

Un updated answer: in knitr 1.17 you can simply use 

![Image Title](path/to/your/image){width=250px}

edit as per comment from @jsb

Note this works only without spaces, e.g. {width=250px} not {width = 250px}

Curl error: Operation timed out

I got same problem lot of time. Check your request url, if you are requesting on local server like 127.1.1/api or 192.168...., try to change it, make sure you are hitting cloud.

Catch multiple exceptions at once?

Exception filters are now available in c# 6+. You can do

try
{
       WebId = new Guid(queryString["web"]);
}
catch (Exception ex) when(ex is FormatException || ex is OverflowException)
{
     WebId = Guid.Empty;
}

In C# 7.0+, you can combine this with pattern matching too

try
{
   await Task.WaitAll(tasks);
}
catch (Exception ex) when( ex is AggregateException ae &&
                           ae.InnerExceptions.Count > tasks.Count/2)
{
   //More than half of the tasks failed maybe..? 
}

C# "No suitable method found to override." -- but there is one

I do not see the class Ext being derived from Base.

Specifying an Index (Non-Unique Key) Using JPA

A unique hand-picked collection of Index annotations

= Specifications =

= ORM Frameworks =

= ORM for Android =

= Other (difficult to categorize) =

  • Realm - Alternative DB for iOS / Android: Annotation io.realm.annotations.Index;
  • Empire-db - a lightweight yet powerful relational DB abstraction layer based on JDBC. It has no schema definition through annotations;
  • Kotlin NoSQL (GitHub) - a reactive and type-safe DSL for working with NoSQL databases (PoC): ???
  • Slick - Reactive Functional Relational Mapping for Scala. It has no schema definition through annotations.

Just go for one of them.

Bash scripting, multiple conditions in while loop

The extra [ ] on the outside of your second syntax are unnecessary, and possibly confusing. You may use them, but if you must you need to have whitespace between them.

Alternatively:

while [ $stats -gt 300 ] || [ $stats -eq 0 ]

Printf width specifier to maintain precision of floating-point value

To my knowledge, there is a well diffused algorithm allowing to output to the necessary number of significant digits such that when scanning the string back in, the original floating point value is acquired in dtoa.c written by Daniel Gay, which is available here on Netlib (see also the associated paper). This code is used e.g. in Python, MySQL, Scilab, and many others.

How to initialize a variable of date type in java?

tl;dr

Use Instant, replacement for java.util.Date.

Instant.now()  // Capture current moment as seen in UTC.

If you must have a Date, convert.

java.util.Date.from( Instant.now() )

java.time

The java.util.Date & .Calendar classes have been supplanted by the java.time framework built into Java 8 and later. The new classes are a tremendous improvement, inspired by the successful Joda-Time library.

The java.time classes tend to use static factory methods rather than constructors for instantiating objects.

To get the current moment in UTC time zone:

Instant instant = Instant.now();

To get the current moment in a particular time zone:

ZoneId zoneId = ZoneId.of( "America/Montreal" );
ZonedDateTime zdt = ZonedDateTime.now( zoneId );

If you must have a java.util.Date for use with other classes not yet updated for the java.time types, convert from Instant.

java.util.Date date = java.util.Date.from( zdt.toInstant() );

Table of date-time types in Java, both modern and legacy.

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

jQuery: Get selected element tag name

jQuery 1.6+ 

jQuery('selector').prop("tagName").toLowerCase()

Older versions 

jQuery('selector').attr("tagName").toLowerCase()

toLowerCase() is not mandatory.

How do you push a Git tag to a branch using a refspec?

For pushing a single tag: git push <reponame> <tagname>

For instance, git push production 1.0.0. Tags are not bound to branches, they are bound to commits.

When you want to have the tag's content in the master branch, do that locally on your machine. I would assume that you continued developing in your local master branch. Then just a git push origin master should suffice.

How can I do DNS lookups in Python, including referring to /etc/hosts?

 
list( map( lambda x: x[4][0], socket.getaddrinfo( \
     'www.example.com.',22,type=socket.SOCK_STREAM)))

gives you a list of the addresses for www.example.com. (ipv4 and ipv6)

Online PHP syntax checker / validator

I found this for online php validation:-

http://www.icosaedro.it/phplint/phplint-on-line.html

Hope this helps.

Real time data graphing on a line chart with html5

In order to complete this thread, I would suggest you to look into:

d3.js

This is a library that helps with tons of javascript visualizations. However the learning curve is quite steep.

nvd3.js

A library that makes it easy to create some d3.js visualizations (with limitations, of course).

Git Remote: Error: fatal: protocol error: bad line length character: Unab

It could be a security access on your machine, are you running Pageant (which is a putty agent)?

How to convert a datetime to string in T-SQL

 
SELECT CONVERT(varchar, @datetime, 103) --for UK Date format 'DD/MM/YYYY'

101 - US - MM/DD/YYYY

108 - Time - HH:MI:SS

112 - Date - YYYYMMDD

121 - ODBC - YYYY-MM-DD HH:MI:SS.FFF

20 - ODBC - YYYY-MM-DD HH:MI:SS

hexadecimal string to byte array in python

 
def hex2bin(s):
    hex_table = ['0000', '0001', '0010', '0011',
                 '0100', '0101', '0110', '0111',
                 '1000', '1001', '1010', '1011',
                 '1100', '1101', '1110', '1111']
    bits = ''
    for i in range(len(s)):
        bits += hex_table[int(s[i], base=16)]
    return bits

How do I include the string header?

Use this:

#include < string>

Is there a way to add/remove several classes in one single instruction with classList?

I liked @rich.kelly's answer, but I wanted to use the same nomenclature as classList.add() (comma seperated strings), so a slight deviation.

DOMTokenList.prototype.addMany = DOMTokenList.prototype.addMany || function() {
  for (var i = 0; i < arguments.length; i++) {
    this.add(arguments[i]);
  }
}
DOMTokenList.prototype.removeMany = DOMTokenList.prototype.removeMany || function() {
  for (var i = 0; i < arguments.length; i++) {
    this.remove(arguments[i]);
  }
}

So you can then use:

document.body.classList.addMany('class-one','class-two','class-three');

I need to test all browsers, but this worked for Chrome.
Should we be checking for something more specific than the existence of DOMTokenList.prototype.addMany? What exactly causes classList.add() to fail in IE11?

Calculating distance between two points (Latitude, Longitude)

In addition to the previous answers, here is a way to calculate the distance inside a SELECT:

CREATE FUNCTION Get_Distance
(   
    @La1 float , @Lo1 float , @La2 float, @Lo2 float
)
RETURNS TABLE 
AS
RETURN 
    -- Distance in Meters
    SELECT GEOGRAPHY::Point(@La1, @Lo1, 4326).STDistance(GEOGRAPHY::Point(@La2, @Lo2, 4326))
    AS Distance
GO

Usage:

select Distance
from Place P1,
     Place P2,
outer apply dbo.Get_Distance(P1.latitude, P1.longitude, P2.latitude, P2.longitude)

Scalar functions also work but they are very inefficient when computing large amount of data.

I hope this might help someone.

Grouping switch statement cases together?

AFAIK all you can do is omit the returns to make things more compact in C++:

switch(Answer)
{
    case 1: case 2: case 3: case 4:
        cout << "You need more cars.";
        break;
    ...
}

(You could remove the other returns as well, of course.)

C subscripted value is neither array nor pointer nor vector when assigning an array element value

Except when it is the operand of the sizeof or unary & operator, or is a string literal being used to initialize another array in a declaration, an expression of type "N-element array of T" is converted ("decays") to an expression of type "pointer to T", and the value of the expression is the address of the first element of the array.

If the declaration of the array being passed is

int S[4][4] = {...};

then when you write

rotateArr( S );

the expression S has type "4-element array of 4-element array of int"; since S is not the operand of the sizeof or unary & operators, it will be converted to an expression of type "pointer to 4-element array of int", or int (*)[4], and this pointer value is what actually gets passed to rotateArr. So your function prototype needs to be one of the following:

T rotateArr( int (*arr)[4] )

or

T rotateArr( int arr[][4] )

or even

T rotateArr( int arr[4][4] )

In the context of a function parameter list, declarations of the form T a[N] and T a[] are interpreted as T *a; all three declare a as a pointer to T.

You're probably wondering why I changed the return type from int to T. As written, you're trying to return a value of type "4-element array of 4-element array of int"; unfortunately, you can't do that. C functions cannot return array types, nor can you assign array types. IOW, you can't write something like:

int a[N], b[N];
...
b = a; // not allowed
a = f(); // not allowed either

Functions can return pointers to arrays, but that's not what you want here. D will cease to exist once the function returns, so any pointer you return will be invalid.

If you want to assign the results of the rotated array to a different array, then you'll have to pass the target array as a parameter to the function:

void rotateArr( int (*dst)[4], int (*src)[4] )
{
  ...
  dst[i][n] = src[n][M - i + 1];
  ...
}

And call it as

int S[4][4] = {...};
int D[4][4];

rotateArr( D, S );

How to make an HTTP POST web request

POST request in itself means sending information in the body. I found a fairly simple way to do this. Use Postman by Google, which allows you to specify the content-type(a header field) as application/json and then provide name-value pairs as parameters. Just use your url in the place of theirs.

POST

var responseString = await "http://www.example.com/recepticle.aspx"
    .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
    .ReceiveString();

GET

var responseString = await "http://www.example.com/recepticle.aspx"
    .GetStringAsync();

How to enable CORS in ASP.NET Core

If you are hosting on IIS, one possible reason is you are getting this is because IIS is blocking OPTIONS verb. I spent almost an hour because of this:

One telltale indication is you are getting 404 error during OPTIONS request.

To fix this, you need to explicitly tell IIS not to block OPTIONS request.

Go to Request Filtering:

IIS Request Filtering

Make sure OPTIONS is allowed:

Make sure OPTIONS is True

Or, just create a web.config with the following setting:

<system.webServer>
    <security>
        <requestFiltering>
            <verbs>
                <remove verb="OPTIONS" />
                <add verb="OPTIONS" allowed="true" />
            </verbs>
        </requestFiltering>
    </security>
</system.webServer>

In jQuery, how do I get the value of a radio button when they all have the same name?

DEMO : https://jsfiddle.net/ipsjolly/xygr065w/

$(function(){
    $("#submit").click(function(){      
        alert($('input:radio:checked').val());
    });
 });

Removing object properties with Lodash

You can easily do this using _.pick:

_x000D_
_x000D_ 
var model = {
  fname: null,
  lname: null
};

var credentials = {
  fname: 'abc',
  lname: 'xyz',
  age: 2
};

var result = _.pick(credentials, _.keys(model));


console.log('result =', result);
_x000D_ 
<script src="https://cdn.jsdelivr.net/lodash/4.16.4/lodash.min.js"></script>
_x000D_
_x000D_
_x000D_

But you can simply use pure JavaScript (specially if you use ECMAScript 6), like this:

_x000D_
_x000D_ 
const model = {
  fname: null,
  lname: null
};

const credentials = {
  fname: 'abc',
  lname: 'xyz',
  age: 2
};

const newModel = {};

Object.keys(model).forEach(key => newModel[key] = credentials[key]);

console.log('newModel =', newModel);
_x000D_
_x000D_
_x000D_

std::thread calling method of class

Not so hard:

#include <thread>

void Test::runMultiThread()
{
    std::thread t1(&Test::calculate, this,  0, 10);
    std::thread t2(&Test::calculate, this, 11, 20);
    t1.join();
    t2.join();
}

If the result of the computation is still needed, use a future instead:

#include <future>

void Test::runMultiThread()
{
     auto f1 = std::async(&Test::calculate, this,  0, 10);
     auto f2 = std::async(&Test::calculate, this, 11, 20);

     auto res1 = f1.get();
     auto res2 = f2.get();
}

How are Anonymous inner classes used in Java?

An inner class is associated with an instance of the outer class and there are two special kinds: Local class and Anonymous class. An anonymous class enables us to declare and instantiate a class at same time, hence makes the code concise. We use them when we need a local class only once as they don't have a name.

Consider the example from doc where we have a Person class:

public class Person {

    public enum Sex {
        MALE, FEMALE
    }

    String name;
    LocalDate birthday;
    Sex gender;
    String emailAddress;

    public int getAge() {
        // ...
    }

    public void printPerson() {
        // ...
    }
}

and we have a method to print members that match search criteria as:

public static void printPersons(
    List<Person> roster, CheckPerson tester) {
    for (Person p : roster) {
        if (tester.test(p)) {
            p.printPerson();
        }
    }
}

where CheckPerson is an interface like:

interface CheckPerson {
    boolean test(Person p);
}

Now we can make use of anonymous class which implements this interface to specify search criteria as:

printPersons(
    roster,
    new CheckPerson() {
        public boolean test(Person p) {
            return p.getGender() == Person.Sex.MALE
                && p.getAge() >= 18
                && p.getAge() <= 25;
        }
    }
);

Here the interface is very simple and the syntax of anonymous class seems unwieldy and unclear.

Java 8 has introduced a term Functional Interface which is an interface with only one abstract method, hence we can say CheckPerson is a functional interface. We can make use of Lambda Expression which allows us to pass the function as method argument as:

printPersons(
                roster,
                (Person p) -> p.getGender() == Person.Sex.MALE
                        && p.getAge() >= 18
                        && p.getAge() <= 25
        );

We can use a standard functional interface Predicate in place of the interface CheckPerson, which will further reduce the amount of code required.

Why use Redux over Facebook Flux?

I'm an early adopter and implemented a mid-large single page application using the Facebook Flux library.

As I'm a little late to the conversation I'll just point out that despite my best hopes Facebook seem to consider their Flux implementation to be a proof of concept and it has never received the attention it deserves.

I'd encourage you to play with it, as it exposes more of the inner working of the Flux architecture which is quite educational, but at the same time it does not provide many of the benefits that libraries like Redux provide (which aren't that important for small projects, but become very valuable for bigger ones).

We have decided that moving forward we will be moving to Redux and I suggest you do the same ;)

Converting between strings and ArrayBuffers

The "native" binary string that atob() returns is a 1-byte-per-character Array.

So we shouldn't store 2 byte into a character.

var arrayBufferToString = function(buffer) {
  return String.fromCharCode.apply(null, new Uint8Array(buffer));
}

var stringToArrayBuffer = function(str) {
  return (new Uint8Array([].map.call(str,function(x){return x.charCodeAt(0)}))).buffer;
}

"inconsistent use of tabs and spaces in indentation"

SOULUTION FOR SUBLIME TEXT

My Solution to this problem was to open it in idle editor and then idle editor will uncover your problem

e.g

SUBLIME TEXT

while run:

    clock.tick(27)
    
    milli = clock.tick()
    seconds = milli/1000
    timeForLevel += seconds
    print(timeForLevel)

IDLE EDITOR

while run:

    clock.tick(27)
    
       milli = clock.tick()
    seconds = milli/1000
    timeForLevel += seconds
    print(timeForLevel)

I am not saying that you should only use idle editor. I'm saying that if you get that error you should check idle editor

How to create global variables accessible in all views using Express / Node.JS?

In your app.js you need add something like this

global.myvar = 100;

Now, in all your files you want use this variable, you can just access it as myvar

How to concatenate properties from multiple JavaScript objects

Why should the function be restricted to 3 arguments? Also, check for hasOwnProperty.

function Collect() {
    var o={};
    for(var i=0;i<arguments.length;i++) {
      var arg=arguments[i];
      if(typeof arg != "object") continue;
      for(var p in arg) {
        if(arg.hasOwnProperty(p)) o[p] = arg[p];
      }
    }
    return o;
}

Angular is automatically adding 'ng-invalid' class on 'required' fields

Since the fields are empty they are not valid, so the ng-invalid and ng-invalid-required classes are added properly.

You can use the class ng-pristine to check out whether the fields have already been used or not.

How can I get sin, cos, and tan to use degrees instead of radians?

I created my own little lazy Math-Object for degree (MathD), hope it helps:

//helper
/**
 * converts degree to radians
 * @param degree
 * @returns {number}
 */
var toRadians = function (degree) {
    return degree * (Math.PI / 180);
};

/**
 * Converts radian to degree
 * @param radians
 * @returns {number}
 */
var toDegree = function (radians) {
    return radians * (180 / Math.PI);
}

/**
 * Rounds a number mathematical correct to the number of decimals
 * @param number
 * @param decimals (optional, default: 5)
 * @returns {number}
 */
var roundNumber = function(number, decimals) {
    decimals = decimals || 5;
    return Math.round(number * Math.pow(10, decimals)) / Math.pow(10, decimals);
}
//the object
var MathD = {
    sin: function(number){
        return roundNumber(Math.sin(toRadians(number)));
    },
    cos: function(number){
        return roundNumber(Math.cos(toRadians(number)));
    },
    tan: function(number){
        return roundNumber(Math.tan(toRadians(number)));
    },
    asin: function(number){
        return roundNumber(toDegree(Math.asin(number)));
    },
    acos: function(number){
       return roundNumber(toDegree(Math.acos(number)));
   },
   atan: function(number){
       return roundNumber(toDegree(Math.atan(number)));
   }
};

What is the PHP syntax to check "is not null" or an empty string?

Null OR an empty string?

if (!empty($user)) {}

Use empty().

After realizing that $user ~= $_POST['user'] (thanks matt):

var uservariable='<?php 
    echo ((array_key_exists('user',$_POST)) || (!empty($_POST['user']))) ? $_POST['user'] : 'Empty Username Input';
?>';

iPad/iPhone hover problem causes the user to double click a link

Just an improvement to avoid redirection when you slide your finger on a link by mistake.

// tablet "one touch (click)" X "hover" > link redirection
$('a').on('touchmove touchend', function(e) {

    // if touchmove>touchend, set the data() for this element to true. then leave touchmove & let touchend fail(data=true) redirection
    if (e.type == 'touchmove') {
        $.data(this, "touchmove_cancel_redirection", true );
        return;
    }

    // if it's a simple touchend, data() for this element doesn't exist.
    if (e.type == 'touchend' && !$.data(this, "touchmove_cancel_redirection")) {
        var el = $(this);
        var link = el.attr('href');
        window.location = link;
    }

    // if touchmove>touchend, to be redirected on a future simple touchend for this element
    $.data(this, "touchmove_cancel_redirection", false );
});

Crystal Reports for VS2012 - VS2013 - VS2015 - VS2017 - VS2019

Here it is! - SP 25 works on Visual Studio 2019, SP 21 on Visual Studio 2017

SAP released SAP Crystal Reports, developer version for Microsoft Visual Studio

You can get it here (click "Installation package for Visual Studio IDE")

To integrate “SAP Crystal Reports, developer version for Microsoft Visual Studio” you must run the Install Executable. Running the MSI will not fully integrate Crystal Reports into VS. MSI files by definition are for runtime distribution only.

New In SP25 Release

Visual Studio 2019, Addressed incidents, Win10 1809, Security update

Converting a string to JSON object

 
var obj = JSON.parse(string);

Where string is your json string.

Update one MySQL table with values from another

It depends what is a use of those tables, but you might consider putting trigger on original table on insert and update. When insert or update is done, update the second table based on only one item from the original table. It will be quicker.

width:auto for <input> fields

Answer 1 - "response" gave a nice answer/link for it. To put it in short, "auto" is the default, so it is like removing any changes in the width of an element

Answer 2 - use width: 100% instead. It will fill the 100% of the parent container, in this case, the "form".

How to create a inner border for a box in html?

Please have a look 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Untitled Document</title>
    <style>
    .box{ width:500px; height:200px; background:#000; border:2px solid #ccc;}
        .inner-border {
            border: 20px solid black;
            box-shadow: inset 0px 0px 0px 10px red;
            box-sizing: border-box; /* Include padding and border in element's width and height */
        }
        /* CSS3 solution only for rectangular shape */
        .inner-outline {
            outline: 10px solid red;
            outline-offset: -30px;
        }
    </style>
    </head>

    <body>
    <div class="box inner-border inner-outline"></div>
    </body>
    </html>

How to import JSON File into a TypeScript file?

I had read some of the responses and they didn't seem to work for me. I am using Typescript 2.9.2, Angular 6 and trying to import JSON in a Jasmine Unit Test. This is what did the trick for me.

Add:

"resolveJsonModule": true,

To tsconfig.json

Import like:

import * as nameOfJson from 'path/to/file.json';

Stop ng test, start again.

Reference: https://blogs.msdn.microsoft.com/typescript/2018/05/31/announcing-typescript-2-9/#json-imports

Perl read line by line

 
#!/usr/bin/perl
use utf8                       ;
use 5.10.1                     ;
use strict                     ;
use autodie                    ;
use warnings FATAL => q  ?all?;
binmode STDOUT     => q ?:utf8?;                  END {
close   STDOUT                 ;                     }
our    $FOLIO      =  q + SnPmaster.txt +            ;
open    FOLIO                  ;                 END {
close   FOLIO                  ;                     }
binmode FOLIO      => q{       :crlf
                               :encoding(CP-1252)    };
while (<FOLIO>)  { print       ;                     }
       continue  { ${.} ^015^  __LINE__  ||   exit   }
                                                                                                                                                                                                                                              __END__
unlink  $FOLIO                 ;
unlink ~$HOME ||
  clri ~$HOME                  ;
reboot                         ;

jQuery - Illegal invocation

In My case I have't define all variables which I am passing to data in ajax.

var page = 1;

$.ajax({
    url: 'your_url',
    type: "post",
    data: { 'page' : page, 'search_candidate' : search_candidate }
    success: function(result){
        alert('function called');
    }
)}

I have just defined variable var search_candidate = "candidate name"; and its working.

var page = 1;
var search_candidate = "candidate name"; // defined
$.ajax({
    url: 'your_url',
    type: "post",
    data: { 'page' : page, 'search_candidate' : search_candidate }
    success: function(result){
        alert('function called');
    }
)}

How to change the Title of the window in Qt?

 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.setWindowTitle("Main Page");
    w.show();
    return a.exec();
}

enter image description here

Parse error: syntax error, unexpected T_ECHO in

Missing ; after var_dump($row)

Install Visual Studio 2013 on Windows 7

Fake IE10 to install Visual Studio 2013

Visual Studio 2013 requires Internet Explorer 10. If you try to install it on Windows 7 with IE8 you get the following error This version of Visual Studio requires Internet Explorer 10”. The value that the VS 2013 installer checks is svcVersion in the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorerkey on 32-bit Windows and HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer on 64-bit Windows. Any value >= 10.0.0.0 makes the installer happy.

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer]
"svcVersion"="10.0.0.0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer]
"svcVersion"="10.0.0.0"

Change Project Namespace in Visual Studio

Right click properties, Application tab, then see the assembly name and default namespace

Number of occurrences of a character in a string

You could do this:

int count = test.Split('&').Length - 1;

Or with LINQ:

test.Count(x => x == '&');

The name does not exist in the namespace error in XAML

The solution for me was to unblock the assembly DLLs. The error messages you get don't indicate this, but the XAML designer refuses to load what it calls "sandboxed" assemblies. You can see this in the output window when you build. DLLs are blocked if they are downloaded from the internet. To unblock your 3rd-party assembly DLLs:

  1. Right click on the DLL file in Windows Explorer and select Properties.
  2. At the bottom of the General tab click the "Unblock" button or checkbox.

Note: Only unblock DLLs if you are sure they are safe.

Select mysql query between date?

All the above works, and here is another way if you just want to number of days/time back rather a entering date

select * from *table_name* where *datetime_column* BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY)  AND NOW()

JSON and XML comparison

The important thing about JSON is to keep data transfer encrypted for security reasons. No doubt that JSON is much much faster then XML. I have seen XML take 100ms where as JSON only took 60ms. JSON data is easy to manipulate.

Trying to handle "back" navigation button action in iOS

Try this code using VIewWillDisappear method to detect the press of The back button of NavigationItem:

-(void) viewWillDisappear:(BOOL)animated
{
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) 
    {
        // Navigation button was pressed. Do some stuff 
        [self.navigationController popViewControllerAnimated:NO];
    }
    [super viewWillDisappear:animated];
}

OR There is another way to get Action of the Navigation BAck button.

Create Custom button for UINavigationItem of back button .

For Ex:

In ViewDidLoad :

- (void)viewDidLoad 
{
    [super viewDidLoad];
    UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:@"Home" style:UIBarButtonItemStyleBordered target:self action:@selector(home:)];
    self.navigationItem.leftBarButtonItem=newBackButton;
}

-(void)home:(UIBarButtonItem *)sender 
{
    [self.navigationController popToRootViewControllerAnimated:YES];
}

Swift :

override func willMoveToParentViewController(parent: UIViewController?) 
{
    if parent == nil 
    {
        // Back btn Event handler
    }
}

Python list iterator behavior and next(iterator)

What is happening is that next(a) returns the next value of a, which is printed to the console because it is not affected.

What you can do is affect a variable with this value:

>>> a = iter(list(range(10)))
>>> for i in a:
...    print(i)
...    b=next(a)
...
0
2
4
6
8

Where do I put my php files to have Xampp parse them?

Look into the httpd.conf and/or httpd-vhosts.conf files and search for the DocumentRoot entry. If you configure multiple virtual hosts, there may be more than one of those, separated in <VirtualHost> tags.

How to change the font and font size of an HTML input tag?

In your 'head' section, add this code:

<style>
input[type='text'] { font-size: 24px; }
</style>

Or you can only add the:

input[type='text'] { font-size: 24px; }

to a CSS file which can later be included.

You can also change the font face by using the CSS property: font-family

font-family: monospace;

So you can have a CSS code like this:

input[type='text'] { font-size: 24px; font-family: monospace; }

You can find further help at the W3Schools website.

I suggest you to have a look at the CSS3 specification. With CSS3 you can also load a font from the web instead of having the limitation to use only the most common fonts or tell the user to download the font you're using.

How do I escape a reserved word in Oracle?

double quotes worked in oracle when I had the keyword as one of the column name.

eg:

select t."size" from table t

"python" not recognized as a command

emphasis: Remember to always RESTART the CMD WINDOW after setting the PATH environmental variable for it to take effect!

Best way to format if statement with multiple conditions

The question was asked and has, so far, been answered as though the decision should be made purely on "syntactic" grounds.

I would say that the right answer of how you lay-out a number of conditions within an if, ought to depend on "semantics" too. So conditions should be broken up and grouped according to what things go together "conceptually".

If two tests are really two sides of the same coin eg. if (x>0) && (x<=100) then put them together on the same line. If another condition is conceptually far more distant eg. user.hasPermission(Admin()) then put it on it's own line

Eg.

if user.hasPermission(Admin()) {
   if (x >= 0) && (x < 100) {
      // do something
   }
}

Laravel 5 route not defined, while it is?

One more cause for this:

If the routes are overridden with the same URI (Unknowingly), it causes this error:

Eg:

Route::get('dashboard', ['uses' => 'SomeController@index', 'as' => 'my.dashboard']);
Route::get('dashboard/', ['uses' => 'SomeController@dashboard', 'as' => 'my.home_dashboard']);

In this case route 'my.dashboard' is invalidate as the both routes has same URI ('dashboard', 'dashboard/')

Solution: You should change the URI for either one

Eg:

Route::get('dashboard', ['uses' => 'SomeController@index', 'as' => 'my.dashboard']);
Route::get('home-dashboard', ['uses' => 'SomeController@dashboard', 'as' => 'my.home_dashboard']);

// See the URI changed for this 'home-dashboard'

Hope it helps some once.

Struct Constructor in C++?

As the other answers mention, a struct is basically treated as a class in C++. This allows you to have a constructor which can be used to initialise the struct with default values. Below, the constructor takes sz and b as arguments, and initializes the other variables to some default values.

struct blocknode
{
    unsigned int bsize;
    bool free;
    unsigned char *bptr;
    blocknode *next;
    blocknode *prev;

    blocknode(unsigned int sz, unsigned char *b, bool f = true,
              blocknode *p = 0, blocknode *n = 0) :
              bsize(sz), free(f), bptr(b), prev(p), next(n) {}
};

Usage:

unsigned char *bptr = new unsigned char[1024];
blocknode *fblock = new blocknode(1024, btpr);

Sum function in VBA

 
Range("A1").Function="=SUM(Range(Cells(2,1),Cells(3,2)))"

won't work because worksheet functions (when actually used on a worksheet) don't understand Range or Cell

Try

Range("A1").Formula="=SUM(" & Range(Cells(2,1),Cells(3,2)).Address(False,False) & ")"

How do I list / export private keys from a keystore?

A portion of code originally from Example Depot for listing all of the aliases in a key store:

    // Load input stream into keystore
    keystore.load(is, password.toCharArray());

    // List the aliases
    Enumeration aliases = keystore.aliases();
    for (; aliases.hasMoreElements(); ) {
        String alias = (String)aliases.nextElement();

        // Does alias refer to a private key?
        boolean b = keystore.isKeyEntry(alias);

        // Does alias refer to a trusted certificate?
        b = keystore.isCertificateEntry(alias);
    }

The exporting of private keys came up on the Sun forums a couple of months ago, and u:turingcompleter came up with a DumpPrivateKey class to stitch into your app.

import java.io.FileInputStream;
import java.security.Key;
import java.security.KeyStore;
import sun.misc.BASE64Encoder;

public class DumpPrivateKey {
     /**
     * Provides the missing functionality of keytool
     * that Apache needs for SSLCertificateKeyFile.
     *
     * @param args  <ul>
     *              <li> [0] Keystore filename.
     *              <li> [1] Keystore password.
     *              <li> [2] alias
     *              </ul>
     */
    static public void main(String[] args)
    throws Exception {
        if(args.length < 3) {
          throw new IllegalArgumentException("expected args: Keystore filename, Keystore password, alias, <key password: default same tha
n keystore");
        }
        final String keystoreName = args[0];
        final String keystorePassword = args[1];
        final String alias = args[2];
        final String keyPassword = getKeyPassword(args,keystorePassword);
        KeyStore ks = KeyStore.getInstance("jks");
        ks.load(new FileInputStream(keystoreName), keystorePassword.toCharArray());
        Key key = ks.getKey(alias, keyPassword.toCharArray());
        String b64 = new BASE64Encoder().encode(key.getEncoded());
        System.out.println("-----BEGIN PRIVATE KEY-----");
        System.out.println(b64);
        System.out.println("-----END PRIVATE KEY-----");
    }
    private static String getKeyPassword(final String[] args, final String keystorePassword)
    {
       String keyPassword = keystorePassword; // default case
       if(args.length == 4) {
         keyPassword = args[3];
       }
       return keyPassword;
    }
}

Note: this use Sun package, which is a "bad thing".
If you can download apache commons code, here is a version which will compile without warning:

javac -classpath .:commons-codec-1.4/commons-codec-1.4.jar DumpPrivateKey.java

and will give the same result:

import java.io.FileInputStream;
import java.security.Key;
import java.security.KeyStore;
//import sun.misc.BASE64Encoder;
import org.apache.commons.codec.binary.Base64;

public class DumpPrivateKey {
     /**
     * Provides the missing functionality of keytool
     * that Apache needs for SSLCertificateKeyFile.
     *
     * @param args  <ul>
     *              <li> [0] Keystore filename.
     *              <li> [1] Keystore password.
     *              <li> [2] alias
     *              </ul>
     */
    static public void main(String[] args)
    throws Exception {
        if(args.length < 3) {
          throw new IllegalArgumentException("expected args: Keystore filename, Keystore password, alias, <key password: default same tha
n keystore");
        }
        final String keystoreName = args[0];
        final String keystorePassword = args[1];
        final String alias = args[2];
        final String keyPassword = getKeyPassword(args,keystorePassword);
        KeyStore ks = KeyStore.getInstance("jks");
        ks.load(new FileInputStream(keystoreName), keystorePassword.toCharArray());
        Key key = ks.getKey(alias, keyPassword.toCharArray());
        //String b64 = new BASE64Encoder().encode(key.getEncoded());
        String b64 = new String(Base64.encodeBase64(key.getEncoded(),true));
        System.out.println("-----BEGIN PRIVATE KEY-----");
        System.out.println(b64);
        System.out.println("-----END PRIVATE KEY-----");
    }
    private static String getKeyPassword(final String[] args, final String keystorePassword)
    {
       String keyPassword = keystorePassword; // default case
       if(args.length == 4) {
         keyPassword = args[3];
       }
       return keyPassword;
    }
}

You can use it like so:

java -classpath .:commons-codec-1.4/commons-codec-1.4.jar DumpPrivateKey $HOME/.keystore changeit tomcat

Purpose of "%matplotlib inline"

%matplotlib is a magic function in IPython. I'll quote the relevant documentation here for you to read for convenience:

IPython has a set of predefined ‘magic functions’ that you can call with a command line style syntax. There are two kinds of magics, line-oriented and cell-oriented. Line magics are prefixed with the % character and work much like OS command-line calls: they get as an argument the rest of the line, where arguments are passed without parentheses or quotes. Lines magics can return results and can be used in the right hand side of an assignment. Cell magics are prefixed with a double %%, and they are functions that get as an argument not only the rest of the line, but also the lines below it in a separate argument.

%matplotlib inline sets the backend of matplotlib to the 'inline' backend:

With this backend, the output of plotting commands is displayed inline within frontends like the Jupyter notebook, directly below the code cell that produced it. The resulting plots will then also be stored in the notebook document.

When using the 'inline' backend, your matplotlib graphs will be included in your notebook, next to the code. It may be worth also reading How to make IPython notebook matplotlib plot inline for reference on how to use it in your code.

If you want interactivity as well, you can use the nbagg backend with %matplotlib notebook (in IPython 3.x), as described here.

Is there a performance difference between i++ and ++i in C?

My C is a little rusty, so I apologize in advance. Speedwise, I can understand the results. But, I am confused as to how both files came out to the same MD5 hash. Maybe a for loop runs the same, but wouldn't the following 2 lines of code generate different assembly?

myArray[i++] = "hello";

vs

myArray[++i] = "hello";

The first one writes the value to the array, then increments i. The second increments i then writes to the array. I'm no assembly expert, but I just don't see how the same executable would be generated by these 2 different lines of code.

Just my two cents.

Reset select2 value and show placeholder

Use this code into your js file

$('#id').val('1');
$('#id').trigger('change');

Getting the document object of an iframe

In my case, it was due to Same Origin policies. To explain it further, MDN states the following:

If the iframe and the iframe's parent document are Same Origin, returns a Document (that is, the active document in the inline frame's nested browsing context), else returns null.

How do I make a dotted/dashed line in Android?

By using this class you can apply "dashed and underline" effect to multiple lines text. to use DashPathEffect you have to turn off hardwareAccelerated of your TextView(though DashPathEffect method has a problem with long text). you can find my sample project here: https://github.com/jintoga/Dashed-Underlined-TextView/blob/master/Untitled.png. 

public class DashedUnderlineSpan implements LineBackgroundSpan, LineHeightSpan {

    private Paint paint;
    private TextView textView;
    private float offsetY;
    private float spacingExtra;

    public DashedUnderlineSpan(TextView textView, int color, float thickness, float dashPath,
                               float offsetY, float spacingExtra) {
        this.paint = new Paint();
        this.paint.setColor(color);
        this.paint.setStyle(Paint.Style.STROKE);
        this.paint.setPathEffect(new DashPathEffect(new float[] { dashPath, dashPath }, 0));
        this.paint.setStrokeWidth(thickness);
        this.textView = textView;
        this.offsetY = offsetY;
        this.spacingExtra = spacingExtra;
    }

    @Override
    public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v,
                             Paint.FontMetricsInt fm) {
        fm.ascent -= spacingExtra;
        fm.top -= spacingExtra;
        fm.descent += spacingExtra;
        fm.bottom += spacingExtra;
    }

    @Override
    public void drawBackground(Canvas canvas, Paint p, int left, int right, int top, int baseline,
                               int bottom, CharSequence text, int start, int end, int lnum) {
        int lineNum = textView.getLineCount();
        for (int i = 0; i < lineNum; i++) {
            Layout layout = textView.getLayout();
            canvas.drawLine(layout.getLineLeft(i), layout.getLineBottom(i) - spacingExtra + offsetY,
                    layout.getLineRight(i), layout.getLineBottom(i) - spacingExtra + offsetY,
                    this.paint);
        }
    }
}

Result:

dashed underline

What's the Android ADB shell "dumpsys" tool and what are its benefits?

Looking at the source code for dumpsys and service, you can get the list of services available by executing the following:

adb shell service -l

You can then supply the service name you are interested in to dumpsys to get the specific information. For example (note that not all services provide dump info):

adb shell dumpsys activity
adb shell dumpsys cpuinfo
adb shell dumpsys battery

As you can see in the code (and in K_Anas's answer), if you call dumpsys without any service name, it will dump the info on all services in one big dump:

adb shell dumpsys

Some services can receive additional arguments on what to show which normally is explained if you supplied a -h argument, for example:

adb shell dumpsys activity -h
adb shell dumpsys window -h
adb shell dumpsys meminfo -h
adb shell dumpsys package -h
adb shell dumpsys batteryinfo -h

How can you get the build/version number of your Android application?

Useful for build systems: there is a file generated with your APK file called output.json which contains an array of information for each generated APK file, including the versionName and versionCode.

For example,

[
    {
        "apkInfo": {
            "baseName": "x86-release",
            "enabled": true,
            "filterName": "x86",
            "fullName": "86Release",
            "outputFile": "x86-release-1.0.apk",
            "splits": [
                {
                    "filterType": "ABI",
                    "value": "x86"
                }
            ],
            "type": "FULL_SPLIT",
            "versionCode": 42,
            "versionName": "1.0"
        },
        "outputType": {
            "type": "APK"
        },
        "path": "app-x86-release-1.0.apk",
        "properties": {}
    }
]

Get only records created today in laravel

If you are using Carbon (and you should, it's awesome!) with Laravel, you can simply do the following:

->where('created_at', '>=', Carbon::today())

Besides now() and today(), you can also use yesterday() and tomorrow() and then use the following:

  • startOfDay()/endOfDay()
  • startOfWeek()/endOfWeek()
  • startOfMonth()/endOfMonth()
  • startOfYear()/endOfYear()
  • startOfDecade()/endOfDecade()
  • startOfCentury()/endOfCentury()

Flutter does not find android sdk

Deleting and reinstalling Android Studio fixes the issue with the SDK.

Android ListView headers

Here's how I do it, the keys are getItemViewType and getViewTypeCount in the Adapter class. getViewTypeCount returns how many types of items we have in the list, in this case we have a header item and an event item, so two. getItemViewType should return what type of View we have at the input position.

Android will then take care of passing you the right type of View in convertView automatically.

Here what the result of the code below looks like:

First we have an interface that our two list item types will implement

public interface Item {
    public int getViewType();
    public View getView(LayoutInflater inflater, View convertView);
}

Then we have an adapter that takes a list of Item

public class TwoTextArrayAdapter extends ArrayAdapter<Item> {
    private LayoutInflater mInflater;

    public enum RowType {
        LIST_ITEM, HEADER_ITEM
    }

    public TwoTextArrayAdapter(Context context, List<Item> items) {
        super(context, 0, items);
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public int getViewTypeCount() {
        return RowType.values().length;

    }

    @Override
    public int getItemViewType(int position) {
        return getItem(position).getViewType();
    }

@Override
public View getView(int position, View convertView, ViewGroup parent) {
   return getItem(position).getView(mInflater, convertView);
}

EDIT Better For Performance.. can be noticed when scrolling

private static final int TYPE_ITEM = 0; 
private static final int TYPE_SEPARATOR = 1; 

public View getView(int position, View convertView, ViewGroup parent)  {
    ViewHolder holder = null;
    int rowType = getItemViewType(position);
    View View;
    if (convertView == null) {
        holder = new ViewHolder();
        switch (rowType) {
            case TYPE_ITEM:
                convertView = mInflater.inflate(R.layout.task_details_row, null);
                holder.View=getItem(position).getView(mInflater, convertView);
                break;
            case TYPE_SEPARATOR:
                convertView = mInflater.inflate(R.layout.task_detail_header, null);
                holder.View=getItem(position).getView(mInflater, convertView);
                break;
        }
        convertView.setTag(holder);
    }
    else
    {
        holder = (ViewHolder) convertView.getTag();
    }
    return convertView; 
} 

public static class ViewHolder {
    public  View View; } 
}

Then we have classes the implement Item and inflate the correct layouts. In your case you'll have something like a Header class and a ListItem class.

   public class Header implements Item {
    private final String         name;

    public Header(String name) {
        this.name = name;
    }

    @Override
    public int getViewType() {
        return RowType.HEADER_ITEM.ordinal();
    }

    @Override
    public View getView(LayoutInflater inflater, View convertView) {
        View view;
        if (convertView == null) {
            view = (View) inflater.inflate(R.layout.header, null);
            // Do some initialization
        } else {
            view = convertView;
        }

        TextView text = (TextView) view.findViewById(R.id.separator);
        text.setText(name);

        return view;
    }

}

And then the ListItem class

    public class ListItem implements Item {
    private final String         str1;
    private final String         str2;

    public ListItem(String text1, String text2) {
        this.str1 = text1;
        this.str2 = text2;
    }

    @Override
    public int getViewType() {
        return RowType.LIST_ITEM.ordinal();
    }

    @Override
    public View getView(LayoutInflater inflater, View convertView) {
        View view;
        if (convertView == null) {
            view = (View) inflater.inflate(R.layout.my_list_item, null);
            // Do some initialization
        } else {
            view = convertView;
        }

        TextView text1 = (TextView) view.findViewById(R.id.list_content1);
        TextView text2 = (TextView) view.findViewById(R.id.list_content2);
        text1.setText(str1);
        text2.setText(str2);

        return view;
    }

}

And a simple Activity to display it

public class MainActivity extends ListActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        List<Item> items = new ArrayList<Item>();
        items.add(new Header("Header 1"));
        items.add(new ListItem("Text 1", "Rabble rabble"));
        items.add(new ListItem("Text 2", "Rabble rabble"));
        items.add(new ListItem("Text 3", "Rabble rabble"));
        items.add(new ListItem("Text 4", "Rabble rabble"));
        items.add(new Header("Header 2"));
        items.add(new ListItem("Text 5", "Rabble rabble"));
        items.add(new ListItem("Text 6", "Rabble rabble"));
        items.add(new ListItem("Text 7", "Rabble rabble"));
        items.add(new ListItem("Text 8", "Rabble rabble"));

        TwoTextArrayAdapter adapter = new TwoTextArrayAdapter(this, items);
        setListAdapter(adapter);
    }

}

Layout for R.layout.header

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        style="?android:attr/listSeparatorTextViewStyle"
        android:id="@+id/separator"
        android:text="Header"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#757678"
        android:textColor="#f5c227" />

</LinearLayout>

Layout for R.layout.my_list_item

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/list_content1"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_margin="5dip"
        android:clickable="false"
        android:gravity="center"
        android:longClickable="false"
        android:paddingBottom="1dip"
        android:paddingTop="1dip"
        android:text="sample"
        android:textColor="#ff7f1d"
        android:textSize="17dip"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/list_content2"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_margin="5dip"
        android:clickable="false"
        android:gravity="center"
        android:linksClickable="false"
        android:longClickable="false"
        android:paddingBottom="1dip"
        android:paddingTop="1dip"
        android:text="sample"
        android:textColor="#6d6d6d"
        android:textSize="17dip" />

</LinearLayout>

Layout for R.layout.activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</RelativeLayout>

You can also get fancier and use ViewHolders, load stuff asynchronously, or whatever you like.

Retain precision with double in Java

Observe that you'd have the same problem if you used limited-precision decimal arithmetic, and wanted to deal with 1/3: 0.333333333 * 3 is 0.999999999, not 1.00000000.

Unfortunately, 5.6, 5.8 and 11.4 just aren't round numbers in binary, because they involve fifths. So the float representation of them isn't exact, just as 0.3333 isn't exactly 1/3.

If all the numbers you use are non-recurring decimals, and you want exact results, use BigDecimal. Or as others have said, if your values are like money in the sense that they're all a multiple of 0.01, or 0.001, or something, then multiply everything by a fixed power of 10 and use int or long (addition and subtraction are trivial: watch out for multiplication).

However, if you are happy with binary for the calculation, but you just want to print things out in a slightly friendlier format, try java.util.Formatter or String.format. In the format string specify a precision less than the full precision of a double. To 10 significant figures, say, 11.399999999999 is 11.4, so the result will be almost as accurate and more human-readable in cases where the binary result is very close to a value requiring only a few decimal places.

The precision to specify depends a bit on how much maths you've done with your numbers - in general the more you do, the more error will accumulate, but some algorithms accumulate it much faster than others (they're called "unstable" as opposed to "stable" with respect to rounding errors). If all you're doing is adding a few values, then I'd guess that dropping just one decimal place of precision will sort things out. Experiment.

How to execute multiple SQL statements from java

I'm not sure that you want to send two SELECT statements in one request statement because you may not be able to access both ResultSets. The database may only return the last result set.

Multiple ResultSets

However, if you're calling a stored procedure that you know can return multiple resultsets something like this will work

CallableStatement stmt = con.prepareCall(...);
try {
...

boolean results = stmt.execute();

while (results) {
    ResultSet rs = stmt.getResultSet();
    try {
    while (rs.next()) {
        // read the data
    }
    } finally {
        try { rs.close(); } catch (Throwable ignore) {}
    }

    // are there anymore result sets?
    results = stmt.getMoreResults();
}
} finally {
    try { stmt.close(); } catch (Throwable ignore) {}
}

Multiple SQL Statements

If you're talking about multiple SQL statements and only one SELECT then your database should be able to support the one String of SQL. For example I have used something like this on Sybase

StringBuffer sql = new StringBuffer( "SET rowcount 100" );
sql.append( " SELECT * FROM tbl_books ..." );
sql.append( " SET rowcount 0" );

stmt = conn.prepareStatement( sql.toString() );

This will depend on the syntax supported by your database. In this example note the addtional spaces padding the statements so that there is white space between the staments.

How to remove all namespaces from XML with C#?

Here is a regex based solution to this problem... 

    private XmlDocument RemoveNS(XmlDocument doc)
    {
        var xml = doc.OuterXml;
        var newxml = Regex.Replace(xml, @"xmlns[:xsi|:xsd]*="".*?""","");
        var newdoc = new XmlDocument();
        newdoc.LoadXml(newxml);
        return newdoc;
    }

Pick images of root folder from sub-folder

../ takes you one folder up the directory tree. Then, select the appropriate folder and its contents.

../images/logo.png

C compiling - "undefined reference to"?

Make sure your declare the tolayer5 function as a prototype, or define the full function definition, earlier in the file where you use it.

How to generate classes from wsdl using Maven and wsimport?

Here is an example of how to generate classes from wsdl with jaxws maven plugin from a url or from a file location (from wsdl file location is commented).

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<build>  
    <plugins>           
        <!-- usage of jax-ws maven plugin-->
        <plugin> 
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>jaxws-maven-plugin</artifactId>
            <version>1.12</version>
            <executions> 
                <execution> 
                    <id>wsimport-from-jdk</id>
                    <goals>
                        <goal>wsimport</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <!-- using wsdl from an url -->
                <wsdlUrls>
                    <wsdlUrl>
                        http://myWSDLurl?wsdl
                    </wsdlUrl>
                </wsdlUrls>
                <!-- or using wsdls file directory -->
                    <!-- <wsdlDirectory>src/wsdl</wsdlDirectory> -->
                <!-- which wsdl file -->
                <!-- <wsdlFiles> -->
                    <!-- <wsdlFile>myWSDL.wsdl</wsdlFile> -->
                <!--</wsdlFiles> -->
                <!-- Keep generated files -->
                <keep>true</keep> 
                <!-- Package name --> 
                <packageName>com.organization.name</packageName> 
                <!-- generated source files destination-->
                <sourceDestDir>target/generatedclasses</sourceDestDir>
            </configuration>
        </plugin>
    </plugins>  
</build>

SQL Add foreign key to existing column

In the future. 

ALTER TABLE Employees
ADD UserID int;

ALTER TABLE Employees
ADD CONSTRAINT FK_ActiveDirectories_UserID FOREIGN KEY (UserID)
    REFERENCES ActiveDirectories(id);

Execute a batch file on a remote PC using a batch file on local PC

You can use WMIC or SCHTASKS (which means no third party software is needed):

1) SCHTASKS:

SCHTASKS /s remote_machine /U username /P password /create /tn "On demand demo" /tr "C:\some.bat" /sc ONCE /sd 01/01/1910 /st 00:00
SCHTASKS /s remote_machine /U username /P password /run /TN "On demand demo"

2) WMIC (wmic will return the pid of the started process)

WMIC /NODE:"remote_machine" /user user /password password process call create "c:\some.bat","c:\exec_dir"

How do I know if jQuery has an Ajax request pending?

The $.ajax() function returns a XMLHttpRequest object. Store that in a variable that's accessible from the Submit button's "OnClick" event. When a submit click is processed check to see if the XMLHttpRequest variable is:

1) null, meaning that no request has been sent yet

2) that the readyState value is 4 (Loaded). This means that the request has been sent and returned successfully.

In either of those cases, return true and allow the submit to continue. Otherwise return false to block the submit and give the user some indication of why their submit didn't work. :)

In a Bash script, how can I exit the entire script if a certain condition occurs?

I often include a function called run() to handle errors. Every call I want to make is passed to this function so the entire script exits when a failure is hit. The advantage of this over the set -e solution is that the script doesn't exit silently when a line fails, and can tell you what the problem is. In the following example, the 3rd line is not executed because the script exits at the call to false.

function run() {
  cmd_output=$(eval $1)
  return_value=$?
  if [ $return_value != 0 ]; then
    echo "Command $1 failed"
    exit -1
  else
    echo "output: $cmd_output"
    echo "Command succeeded."
  fi
  return $return_value
}
run "date"
run "false"
run "date"

How to check if a String contains any letter from a to z?

What about:

//true if it doesn't contain letters
bool result = hello.Any(x => !char.IsLetter(x));

How to populate HTML dropdown list with values from database

 
<select name="owner">
<?php 
$sql = mysql_query("SELECT username FROM users");
while ($row = mysql_fetch_array($sql)){
echo "<option value=\"owner1\">" . $row['username'] . "</option>";
}
?>
</select>

Using continue in a switch statement

It's fine, the continue statement relates to the enclosing loop, and your code should be equivalent to (avoiding such jump statements):

while (something = get_something()) {
    if (something == A || something == B)
        do_something();
}

But if you expect break to exit the loop, as your comment suggest (it always tries again with another something, until it evaluates to false), you'll need a different structure.

For example:

do {
    something = get_something();
} while (!(something == A || something == B));
do_something();

How to import a Python class that is in a directory above?

Here's a three-step, somewhat minimalist version of ThorSummoner's answer for the sake of clarity. It doesn't quite do what I want (I'll explain at the bottom), but it works okay.

Step 1: Make directory and setup.py

filepath_to/project_name/
    setup.py

In setup.py, write:

import setuptools

setuptools.setup(name='project_name')

Step 2: Install this directory as a package

Run this code in console:

python -m pip install --editable filepath_to/project_name

Instead of python, you may need to use python3 or something, depending on how your python is installed. Also, you can use -e instead of --editable.

Now, your directory will look more or less like this. I don't know what the egg stuff is.

filepath_to/project_name/
    setup.py
    test_3.egg-info/
        dependency_links.txt
        PKG-INFO
        SOURCES.txt
        top_level.txt

This folder is considered a python package and you can import from files in this parent directory even if you're writing a script anywhere else on your computer.

Step 3. Import from above

Let's say you make two files, one in your project's main directory and another in a sub directory. It'll look like this:

filepath_to/project_name/
    top_level_file.py
    subdirectory/
        subfile.py

    setup.py          |
    test_3.egg-info/  |----- Ignore these guys
        ...           |

Now, if top_level_file.py looks like this:

x = 1

Then I can import it from subfile.py, or really any other file anywhere else on your computer.

# subfile.py  OR  some_other_python_file_somewhere_else.py

import random # This is a standard package that can be imported anywhere.
import top_level_file # Now, top_level_file.py works similarly.

print(top_level_file.x)

This is different than what I was looking for: I hoped python had a one-line way to import from a file above. Instead, I have to treat the script like a module, do a bunch of boilerplate, and install it globally for the entire python installation to have access to it. It's overkill. If anyone has a simpler method than doesn't involve the above process or importlib shenanigans, please let me know.

Win32Exception (0x80004005): The wait operation timed out

Look into re-indexing tables in your database.

You can first find out the fragmentation level - and if it's above 10% or so you could benefit from re-indexing. If it's very high it's likely this is creating a significant performance bottle neck.

http://blog.sqlauthority.com/2009/01/30/sql-server-2008-2005-rebuild-every-index-of-all-tables-of-database-rebuild-index-with-fillfactor/

This should be done regularly.

Split files using tar, gz, zip, or bzip2

use tar to split into multiple archives

there are plenty of programs that will work with tar files on windows, including cygwin.

Test a string for a substring

There are several other ways, besides using the in operator (easiest):

index()

>>> try:
...   "xxxxABCDyyyy".index("test")
... except ValueError:
...   print "not found"
... else:
...   print "found"
...
not found

find()

>>> if "xxxxABCDyyyy".find("ABCD") != -1:
...   print "found"
...
found

re

>>> import re
>>> if re.search("ABCD" , "xxxxABCDyyyy"):
...  print "found"
...
found

Remove object from a list of objects in python

You could try this to dynamically remove an object from an array without looping through it? Where e and t are just random objects.

>>> e = {'b':1, 'w': 2}
>>> t = {'b':1, 'w': 3}
>>> p = [e,t]
>>> p
[{'b': 1, 'w': 2}, {'b': 1, 'w': 3}]
>>>
>>> p.pop(p.index({'b':1, 'w': 3}))
{'b': 1, 'w': 3}
>>> p
[{'b': 1, 'w': 2}]
>>>

Enable remote connections for SQL Server Express 2012

Having problems connecting to SQL Server?

Try disconnecting firewall.

If you can connect with firewall disconnected, may be you miss some input rules like "sql service broker", add this input rules to your firewall:

"SQL ADMIN CONNECTION" TCP PORT 1434

"SQL ADMIN CONNECTION" UDP PORT 1434

"SQL ANALYSIS SERVICE" TCP PORT 2383

"SQL BROWSE ANALYSIS SERVICE" TCP PORT 2382

"SQL DEBUGGER/RPC" TCP PORT 135

"SQL SERVER" TCP PORT 1433 and others if you have dinamic ports

"SQL SERVICE BROKER" TCP PORT 4022

Open links in new window using AngularJS

It works for me. Inject $window service in to your controller. 

$window.open("somepath/", "_blank")

How to subtract a day from a date?

Also just another nice function i like to use when i want to compute i.e. first/last day of the last month or other relative timedeltas etc. ...

The relativedelta function from dateutil function (a powerful extension to the datetime lib)

import datetime as dt
from dateutil.relativedelta import relativedelta
#get first and last day of this and last month)
today = dt.date.today()
first_day_this_month = dt.date(day=1, month=today.month, year=today.year)
last_day_last_month = first_day_this_month - relativedelta(days=1)
print (first_day_this_month, last_day_last_month)

>2015-03-01 2015-02-28

Set a default parameter value for a JavaScript function

Use this if you want to use latest ECMA6 syntax:

_x000D_
_x000D_ 
function myFunction(someValue = "This is DEFAULT!") {_x000D_
  console.log("someValue --> ", someValue);_x000D_
}_x000D_
_x000D_
myFunction("Not A default value") // calling the function without default value_x000D_
myFunction()  // calling the function with default value
_x000D_
_x000D_
_x000D_

It is called default function parameters. It allows formal parameters to be initialized with default values if no value or undefined is passed. NOTE: It wont work with Internet Explorer or older browsers.

For maximum possible compatibility use this:

_x000D_
_x000D_ 
function myFunction(someValue) {_x000D_
  someValue = (someValue === undefined) ? "This is DEFAULT!" : someValue;_x000D_
  console.log("someValue --> ", someValue);_x000D_
}_x000D_
_x000D_
myFunction("Not A default value") // calling the function without default value_x000D_
myFunction()  // calling the function with default value
_x000D_
_x000D_
_x000D_

Both functions have exact same behavior as each of these example rely on the fact that the parameter variable will be undefined if no parameter value was passed when calling that function.

Why does "return list.sort()" return None, not the list?

The problem is here:

answer = newList.sort()

sort does not return the sorted list; rather, it sorts the list in place.

Use:

answer = sorted(newList)

Pad a number with leading zeros in JavaScript

Not a lot of "slick" going on so far:

function pad(n, width, z) {
  z = z || '0';
  n = n + '';
  return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
}

When you initialize an array with a number, it creates an array with the length set to that value so that the array appears to contain that many undefined elements. Though some Array instance methods skip array elements without values, .join() doesn't, or at least not completely; it treats them as if their value is the empty string. Thus you get a copy of the zero character (or whatever "z" is) between each of the array elements; that's why there's a + 1 in there.

Example usage:

pad(10, 4);      // 0010
pad(9, 4);       // 0009
pad(123, 4);     // 0123

pad(10, 4, '-'); // --10

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

Here's a benchmark to compare a Go for statement with a ForClause and a Go range statement using the iter package.

iter_test.go

package main

import (
    "testing"

    "github.com/bradfitz/iter"
)

const loops = 1e6

func BenchmarkForClause(b *testing.B) {
    b.ReportAllocs()
    j := 0
    for i := 0; i < b.N; i++ {
        for j = 0; j < loops; j++ {
            j = j
        }
    }
    _ = j
}

func BenchmarkRangeIter(b *testing.B) {
    b.ReportAllocs()
    j := 0
    for i := 0; i < b.N; i++ {
        for j = range iter.N(loops) {
            j = j
        }
    }
    _ = j
}

// It does not cause any allocations.
func N(n int) []struct{} {
    return make([]struct{}, n)
}

func BenchmarkIterAllocs(b *testing.B) {
    b.ReportAllocs()
    var n []struct{}
    for i := 0; i < b.N; i++ {
        n = iter.N(loops)
    }
    _ = n
}

Output:

$ go test -bench=. -run=.
testing: warning: no tests to run
PASS
BenchmarkForClause      2000       1260356 ns/op           0 B/op          0 allocs/op
BenchmarkRangeIter      2000       1257312 ns/op           0 B/op          0 allocs/op
BenchmarkIterAllocs 20000000            82.2 ns/op         0 B/op          0 allocs/op
ok      so/test 7.026s
$

Why is setTimeout(fn, 0) sometimes useful?

By calling setTimeout you give the page time to react to the whatever the user is doing. This is particularly helpful for functions run during page load.

Cannot attach the file *.mdf as database

Take a look at this: Entity Framework don't create database

I would try giving the database a different name. Sometimes you can run into problems with SQL Express when trying to create a database with the same name a second time. There is a way to fix this using SQL Server Management Studio but it's generally easier to just use a different database name.

Edit This answer was accepted because it confirms the bug and the workaround used by OP (renaming database could help). I totally agree that renaming the database is not really an acceptable way, and does not totally solve the issue. Unfortunatly I didn't check the other ways to really solve it in SSMS.

MySQL : ERROR 1215 (HY000): Cannot add foreign key constraint

It is also possible to get this error if the foreign key is not a primary key within its own table.

I did an ALTER TABLE and accidentally removed the primary key status of a column, and got this error.

Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?

 
@article = user.articles.build(:title => "MainTitle")
@article.save

How can I hide an HTML table row <tr> so that it takes up no space?

HTML:

<input type="checkbox" id="attraction" checked="checked" onchange="updateMap()">poi.attraction</input>

JavaScript:

function updateMap() {
     map.setOptions({'styles': getStyles() });
} 

function getStyles() {
    var styles = [];
    for (var i=0; i < types.length; i++) {
      var style = {};
      var type = types[i];
      var enabled = document.getElementById(type).checked;
      style['featureType'] = 'poi.' + type;
      style['elementType'] = 'labels';
      style['stylers'] = [{'visibility' : (enabled ? 'on' : 'off') }];
      styles.push(style);
    }
    return styles;
}

how to display none through code behind

Since this is a login div, shouldn't the default be to NOT display it. I am going to go ahead and assume then you want to display it then via javascript.

<div id="login" style="display:none;">Content</div>

Then using jQuery:

<script type="javascript">$('#login').show();</script>

Another method you might consider is something like this:

<div id="login" style="display:<%=SetDisplay() %>">Content</div>

And the SetDisplay() method output "none" or "block"

Grant execute permission for a user on all stored procedures in database?

Create a role add this role to users, and then you can grant execute to all the routines in one shot to this role.

CREATE ROLE <abc>
GRANT EXECUTE TO <abc>

EDIT
This works in SQL Server 2005, I'm not sure about backward compatibility of this feature, I'm sure anything later than 2005 should be fine.

How do I see the current encoding of a file in Sublime Text?

plugin ConverToUTF8 also has the functionality.

ASP.NET Core - Swashbuckle not creating swagger.json file

You must conform to 2 rules:

  1. Decorate all actions with explicit Http Methods like[HttpGet("xxx")],[HttpPost("xxx")] or ... instead of [Route("xxx")].
  2. Decorate public methods in controllers with [NonAction] Attribute.

Note that http://localhost:XXXX/swagger/ page requests for http://localhost:XXXX/swagger/v1/swagger.json file, but an Exception will occur from Swagger if you wouldn't conform above rules.

One line if statement not working

if else condition can be covered with ternary operator 

@item.rigged? ? 'Yes' : 'No'

Access iframe elements in JavaScript

You should access frames from window and not document

window.frames['myIFrame'].document.getElementById('myIFrameElemId')

How do I turn off the mysql password validation?

If you want to make exceptions, you can apply the following "hack". It requires a user with DELETE and INSERT privilege for mysql.plugin system table.

uninstall plugin validate_password;
SET PASSWORD FOR 'app' = PASSWORD('abcd');
INSTALL PLUGIN validate_password SONAME 'validate_password.so';

Bland security disclaimer: Consider, why you are making your password shorter or easier and perhaps consider replacing it with one that is more complex. However, I understand the "it's 3AM and just needs to work" moments, just make sure you don't build a system of hacks, lest you yourself be hacked

How to pass command line argument to gnuplot?

You can input variables via switch -e

$ gnuplot -e "filename='foo.data'" foo.plg

In foo.plg you can then use that variable

$ cat foo.plg 
plot filename
pause -1

To make "foo.plg" a bit more generic, use a conditional:

if (!exists("filename")) filename='default.dat'
plot filename
pause -1

Note that -e has to precede the filename otherwise the file runs before the -e statements. In particular, running a shebang gnuplot #!/usr/bin/env gnuplot with ./foo.plg -e ... CLI arguments will ignore use the arguments provided.

How can I implement custom Action Bar with custom buttons in Android?

1 You can use a drawable

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_item1"
        android:icon="@drawable/my_item_drawable"
        android:title="@string/menu_item1"
        android:showAsAction="ifRoom" />
</menu>

2 Create a style for the action bar and use a custom background:

<resources>
    <!-- the theme applied to the application or activity -->
    <style name="CustomActivityTheme" parent="@android:style/Theme.Holo">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <!-- other activity and action bar styles here -->
    </style>
    <!-- style for the action bar backgrounds -->
    <style name="MyActionBar" parent="@android:style/Widget.Holo.ActionBar">
        <item name="android:background">@drawable/background</item>
        <item name="android:backgroundStacked">@drawable/background</item>
        <item name="android:backgroundSplit">@drawable/split_background</item>
    </style>
</resources>

3 Style again android:actionBarDivider

The android documentation is very usefull for that.

What is a Windows Handle?

A HANDLE in Win32 programming is a token that represents a resource that is managed by the Windows kernel. A handle can be to a window, a file, etc.

Handles are simply a way of identifying a particulate resource that you want to work with using the Win32 APIs.

So for instance, if you want to create a Window, and show it on the screen you could do the following:

// Create the window
HWND hwnd = CreateWindow(...); 
if (!hwnd)
   return; // hwnd not created

// Show the window.
ShowWindow(hwnd, SW_SHOW);

In the above example HWND means "a handle to a window".

If you are used to an object oriented language you can think of a HANDLE as an instance of a class with no methods who's state is only modifiable by other functions. In this case the ShowWindow function modifies the state of the Window HANDLE.

See Handles and Data Types for more information.

How to skip over an element in .map()?

I use .forEach to iterate over , and push result to results array then use it, with this solution I will not loop over array twice

Using multiple arguments for string formatting in Python (e.g., '%s ... %s')

For python2 you can also do this

'%(author)s in %(publication)s'%{'author':unicode(self.author),
                                  'publication':unicode(self.publication)}

which is handy if you have a lot of arguments to substitute (particularly if you are doing internationalisation)

Python2.6 onwards supports .format()

'{author} in {publication}'.format(author=self.author,
                                   publication=self.publication)

Enforcing the type of the indexed members of a Typescript object?

 
var stuff: { [key: string]: string; } = {};
stuff['a'] = ''; // ok
stuff['a'] = 4;  // error

// ... or, if you're using this a lot and don't want to type so much ...
interface StringMap { [key: string]: string; }
var stuff2: StringMap = { };
// same as above

How to concat a string to xsl:value-of select="...?

Not the most readable solution, but you can mix the result from a value-of with plain text:

<a>
  <xsl:attribute name="href"> 
    Text<xsl:value-of select="/*/properties/property[@name='report']/@value"/>Text
  </xsl:attribute>
</a>

Best way to test exceptions with Assert to ensure they will be thrown

Unfortunately MSTest STILL only really has the ExpectedException attribute (just shows how much MS cares about MSTest) which IMO is pretty awful because it breaks the Arrange/Act/Assert pattern and it doesnt allow you to specify exactly which line of code you expect the exception to occur on.

When I'm using (/forced by a client) to use MSTest I always use this helper class:

public static class AssertException
{
    public static void Throws<TException>(Action action) where TException : Exception
    {
        try
        {
            action();
        }
        catch (Exception ex)
        {
            Assert.IsTrue(ex.GetType() == typeof(TException), "Expected exception of type " + typeof(TException) + " but type of " + ex.GetType() + " was thrown instead.");
            return;
        }
        Assert.Fail("Expected exception of type " + typeof(TException) + " but no exception was thrown.");
    }

    public static void Throws<TException>(Action action, string expectedMessage) where TException : Exception
    {
        try
        {
            action();
        }
        catch (Exception ex)
        {
            Assert.IsTrue(ex.GetType() == typeof(TException), "Expected exception of type " + typeof(TException) + " but type of " + ex.GetType() + " was thrown instead.");
            Assert.AreEqual(expectedMessage, ex.Message, "Expected exception with a message of '" + expectedMessage + "' but exception with message of '" + ex.Message + "' was thrown instead.");
            return;
        }
        Assert.Fail("Expected exception of type " + typeof(TException) + " but no exception was thrown.");
    }
}

Example of usage:

AssertException.Throws<ArgumentNullException>(() => classUnderTest.GetCustomer(null));

Open Excel file for reading with VBA without display

A much simpler approach that doesn't involve manipulating active windows:

Dim wb As Workbook
Set wb = Workbooks.Open("workbook.xlsx")
wb.Windows(1).Visible = False

From what I can tell the Windows index on the workbook should always be 1. If anyone knows of any race conditions that would make this untrue please let me know.

SQL query to make all data in a column UPPER CASE?

Permanent:

UPDATE
  MyTable
SET
  MyColumn = UPPER(MyColumn)

Temporary:

SELECT
  UPPER(MyColumn) AS MyColumn
FROM
  MyTable

Create a data.frame with m columns and 2 rows

For completeness:

Along the lines of Chase's answer, I usually use as.data.frame to coerce the matrix to a data.frame:

m <- as.data.frame(matrix(0, ncol = 30, nrow = 2))

EDIT: speed test data.frame vs. as.data.frame

system.time(replicate(10000, data.frame(matrix(0, ncol = 30, nrow = 2))))
   user  system elapsed 
  8.005   0.108   8.165 

system.time(replicate(10000, as.data.frame(matrix(0, ncol = 30, nrow = 2))))
   user  system elapsed 
  3.759   0.048   3.802

Yes, it appears to be faster (by about 2 times).

Increase heap size in Java

java -d64 -Xms512m -Xmx4g HelloWorld

where, -d64: Will enable 64-bit JVM -Xms512m: Will set initial heap size as 512 MB -Xmx4g: Will set maximum heap size as 4 GB (here java file name is : HelloWorld.java)

How to stop mongo DB in one command

Kindly take advantage of the Task Manager provided by your OS for a quick and easy solution. Below is the screengrab from/for Windows 10. Right-click on the highlighted process and select stop. Select start, if already stopped.

enter image description here

Please Note: Internally the commands are doing the same thing which you have to do manually using a GUI (Task Manager), provided by Windows/your OS. Though, this approach to be used for study/practice purpose to get started and you won't be blocked due to this.

how to enable sqlite3 for php?

Edit: This answer is outdated, but can't be removed because it's accepted. Please see the solution from Stacey Richards for the correct answer.

 sudo apt-get install php5-cli php5-dev make
 sudo apt-get install libsqlite3-0 libsqlite3-dev
 sudo apt-get install php5-sqlite3
 sudo apt-get remove php5-sqlite3
 cd ~
 wget http://pecl.php.net/get/sqlite3-0.6.tgz
 tar -zxf sqlite3-0.6.tgz
 cd sqlite3-0.6/
 sudo phpize
 sudo ./configure
 sudo make
 sudo make install
 sudo apache2ctl restart

Ripped from the ubuntu form.

Java constant examples (Create a java file having only constants)

You can also use the Properties class

Here's the constants file called 

# this will hold all of the constants
frameWidth = 1600
frameHeight = 900

Here is the code that uses the constants

public class SimpleGuiAnimation {

    int frameWidth;
    int frameHeight;


    public SimpleGuiAnimation() {
        Properties properties = new Properties();

        try {
            File file = new File("src/main/resources/dataDirectory/gui_constants.properties");
            FileInputStream fileInputStream = new FileInputStream(file);
            properties.load(fileInputStream);
        }
        catch (FileNotFoundException fileNotFoundException) {
            System.out.println("Could not find the properties file" + fileNotFoundException);
        }
        catch (Exception exception) {
            System.out.println("Could not load properties file" + exception.toString());
        }


        this.frameWidth = Integer.parseInt(properties.getProperty("frameWidth"));
        this.frameHeight = Integer.parseInt(properties.getProperty("frameHeight"));
    }

Manually highlight selected text in Notepad++

To highlight a block of code in Notepad++, please do the following steps

  1. Select the required text.
  2. Right click to display the context menu
  3. Choose Style token and select any of the five choices available ( styles from Using 1st style to using 5th style). Each is of different colors.If you want yellow color choose using 3rd style.

If you want to create your own style you can use Style Configurator under Settings menu.

How do I do base64 encoding on iOS?

I have done it using the following class..

@implementation Base64Converter
static char base64EncodingTable[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',  'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',    '8', '9', '+', '/'
};
+ (NSString *) base64StringFromData: (NSData *)data length: (int)length {

unsigned long ixtext, lentext;

long ctremaining;

unsigned char input[3], output[4];

short i, charsonline = 0, ctcopy;

const unsigned char *raw;

NSMutableString *result;

lentext = [data length];

if (lentext < 1)
    return @"";

result = [NSMutableString stringWithCapacity: lentext];

raw = [data bytes];

ixtext = 0;

while (true) {

    ctremaining = lentext - ixtext;

    if (ctremaining <= 0)
        break;

    for (i = 0; i < 3; i++) {
        unsigned long ix = ixtext + i;
        if (ix < lentext)
            input[i] = raw[ix];
        else
            input[i] = 0;
    }

    output[0] = (input[0] & 0xFC) >> 2;

    output[1] = ((input[0] & 0x03) << 4) | ((input[1] & 0xF0) >> 4);

    output[2] = ((input[1] & 0x0F) << 2) | ((input[2] & 0xC0) >> 6);

    output[3] = input[2] & 0x3F;

    ctcopy = 4;

    switch (ctremaining) {
        case 1:
            ctcopy = 2;
            break;

        case 2:
            ctcopy = 3;
            break;
    }

    for (i = 0; i < ctcopy; i++)
        [result appendString: [NSString stringWithFormat: @"%c", base64EncodingTable[output[i]]]];

    for (i = ctcopy; i < 4; i++)
        [result appendString: @"="];

    ixtext += 3;

    charsonline += 4;

    if ((length > 0) && (charsonline >= length))
        charsonline = 0;
}
return result;
}
@end

While calling call 

 [Base64Converter base64StringFromData:dataval length:lengthval];

That's it...

TypeError: can't pickle _thread.lock objects

I had the same problem with Pool() in Python 3.6.3.

Error received: TypeError: can't pickle _thread.RLock objects

Let's say we want to add some number num_to_add to each element of some list num_list in parallel. The code is schematically like this:

class DataGenerator:
    def __init__(self, num_list, num_to_add)
        self.num_list = num_list # e.g. [4,2,5,7]
        self.num_to_add = num_to_add # e.g. 1 

        self.run()

    def run(self):
        new_num_list = Manager().list()

        pool = Pool(processes=50)
        results = [pool.apply_async(run_parallel, (num, new_num_list)) 
                      for num in num_list]
        roots = [r.get() for r in results]
        pool.close()
        pool.terminate()
        pool.join()

    def run_parallel(self, num, shared_new_num_list):
        new_num = num + self.num_to_add # uses class parameter
        shared_new_num_list.append(new_num)

The problem here is that self in function run_parallel() can't be pickled as it is a class instance. Moving this parallelized function run_parallel() out of the class helped. But it's not the best solution as this function probably needs to use class parameters like self.num_to_add and then you have to pass it as an argument.

Solution:

def run_parallel(num, shared_new_num_list, to_add): # to_add is passed as an argument
    new_num = num + to_add
    shared_new_num_list.append(new_num)

class DataGenerator:
    def __init__(self, num_list, num_to_add)
        self.num_list = num_list # e.g. [4,2,5,7]
        self.num_to_add = num_to_add # e.g. 1

        self.run()

    def run(self):
        new_num_list = Manager().list()

        pool = Pool(processes=50)
        results = [pool.apply_async(run_parallel, (num, new_num_list, self.num_to_add)) # num_to_add is passed as an argument
                      for num in num_list]
        roots = [r.get() for r in results]
        pool.close()
        pool.terminate()
        pool.join()

Other suggestions above didn't help me.

SQL Data Reader - handling Null column values

You may use the conditional operator:

employee.FirstName = sqlreader["indexFirstName"] != DBNull.Value ? sqlreader[indexFirstName].ToString() : "";

linux/videodev.h : no such file or directory - OpenCV on ubuntu 11.04

v4l support has been dropped in recent kernel versions (including the one shipped with Ubuntu 11.04).

EDIT: Your question is connected to a recent message that was sent to the OpenCV users group, which has instructions to compile OpenCV 2.2 in Ubuntu 11.04. Your approach is not ideal.

In SQL, how can you "group by" in ranges?

 
select cast(score/10 as varchar) + '-' + cast(score/10+9 as varchar), 
       count(*)
from scores
group by score/10

.htaccess: where is located when not in www base dir

. (dot) files are hidden by default on Unix/Linux systems. Most likely, if you know they are .htaccess files, then they are probably in the root folder for the website.

If you are using a command line (terminal) to access, then they will only show up if you use:

ls -a

If you are using a GUI application, look for a setting to "show hidden files" or something similar.

If you still have no luck, and you are on a terminal, you can execute these commands to search the whole system (may take some time):

cd /
find . -name ".htaccess"

This will list out any files it finds with that name.

Get last 30 day records from today date in SQL Server

Below query is appropriate for the last 30 days records

Here, I have used a review table and review_date is a column from the review table

SELECT * FROM reviews WHERE DATE(review_date) >= DATE(NOW()) - INTERVAL 30 DAY

Questions every good .NET developer should be able to answer?

This is a bit of a variable question, and not really one you should be able to answer completely now, but one you should be able to answer when appropriate:

"What does the .NET framework offer to get task X done?"

Or more specifically:

"Does the .NET framework include an object that does X?"

For example, I recently spent a few hours developing an object that is optimized to store an array of Booleans and operate on it, such as doing a collection-wise NOT, OR, XOR, AND, set all values, etc. It wasn't until after I finished writing all my unit tests and tweaking it for the best performance possible that I realized my "BoolArray" object already existed in the .NET framework under the name "BitArray".

This can be a tough one to answer since many times the best answer on what object / helpers to use is the one you do not know or fully understand. How wonderful the .NET world would be if everyone actually knew about even the simple StringBuilder, a basic tool that can increase performance significant amounts.

Eclipse CDT: no rule to make target all

Yet another solution:

I got inside objects.mk file

################################################################################
# Automatically-generated file. Do not edit!
################################################################################

USER_OBJS := /home/../mylib.so

LIBS := -lstdc++fs -lGL -lGLU -lGLEW -lglut -lm -lmylib

then didn't read first line. Then altered next line. It was another projects' folder because I copied this using "copy/clone project" feature and this was causing the error for me. I changed myLib.so into /proper_address/reallyMyLib.so and it worked.

Warning: It may harm some unknown places! Backup whole project before doing this. Because it says "do not edit".

How to use SVG markers in Google Maps API v3

OK! I done this soon in my web,I try two ways to create the custom google map marker, this run code use canvg.js is the best compatibility for browser.the Commented-Out Code is not support IE11 urrently.

_x000D_
_x000D_ 
var marker;_x000D_
var CustomShapeCoords = [16, 1.14, 21, 2.1, 25, 4.2, 28, 7.4, 30, 11.3, 30.6, 15.74, 25.85, 26.49, 21.02, 31.89, 15.92, 43.86, 10.92, 31.89, 5.9, 26.26, 1.4, 15.74, 2.1, 11.3, 4, 7.4, 7.1, 4.2, 11, 2.1, 16, 1.14];_x000D_
_x000D_
function initMap() {_x000D_
  var map = new google.maps.Map(document.getElementById('map'), {_x000D_
    zoom: 13,_x000D_
    center: {_x000D_
      lat: 59.325,_x000D_
      lng: 18.070_x000D_
    }_x000D_
  });_x000D_
  var markerOption = {_x000D_
    latitude: 59.327,_x000D_
    longitude: 18.067,_x000D_
    color: "#" + "000",_x000D_
    text: "ha"_x000D_
  };_x000D_
  marker = createMarker(markerOption);_x000D_
  marker.setMap(map);_x000D_
  marker.addListener('click', changeColorAndText);_x000D_
};_x000D_
_x000D_
function changeColorAndText() {_x000D_
  var iconTmpObj = createSvgIcon( "#c00", "ok" );_x000D_
  marker.setOptions( {_x000D_
                icon: iconTmpObj_x000D_
            } );_x000D_
};_x000D_
_x000D_
function createMarker(options) {_x000D_
  //IE MarkerShape has problem_x000D_
  var markerObj = new google.maps.Marker({_x000D_
    icon: createSvgIcon(options.color, options.text),_x000D_
    position: {_x000D_
      lat: parseFloat(options.latitude),_x000D_
      lng: parseFloat(options.longitude)_x000D_
    },_x000D_
    draggable: false,_x000D_
    visible: true,_x000D_
    zIndex: 10,_x000D_
    shape: {_x000D_
      coords: CustomShapeCoords,_x000D_
      type: 'poly'_x000D_
    }_x000D_
  });_x000D_
_x000D_
  return markerObj;_x000D_
};_x000D_
_x000D_
function createSvgIcon(color, text) {_x000D_
  var div = $("<div></div>");_x000D_
_x000D_
  var svg = $(_x000D_
    '<svg width="32px" height="43px"  viewBox="0 0 32 43" xmlns="http://www.w3.org/2000/svg">' +_x000D_
    '<path style="fill:#FFFFFF;stroke:#020202;stroke-width:1;stroke-miterlimit:10;" d="M30.6,15.737c0-8.075-6.55-14.6-14.6-14.6c-8.075,0-14.601,6.55-14.601,14.6c0,4.149,1.726,7.875,4.5,10.524c1.8,1.801,4.175,4.301,5.025,5.625c1.75,2.726,5,11.976,5,11.976s3.325-9.25,5.1-11.976c0.825-1.274,3.05-3.6,4.825-5.399C28.774,23.813,30.6,20.012,30.6,15.737z"/>' +_x000D_
    '<circle style="fill:' + color + ';" cx="16" cy="16" r="11"/>' +_x000D_
    '<text x="16" y="20" text-anchor="middle" style="font-size:10px;fill:#FFFFFF;">' + text + '</text>' +_x000D_
    '</svg>'_x000D_
  );_x000D_
  div.append(svg);_x000D_
_x000D_
  var dd = $("<canvas height='50px' width='50px'></cancas>");_x000D_
_x000D_
  var svgHtml = div[0].innerHTML;_x000D_
_x000D_
  canvg(dd[0], svgHtml);_x000D_
_x000D_
  var imgSrc = dd[0].toDataURL("image/png");_x000D_
  //"scaledSize" and "optimized: false" together seems did the tricky ---IE11  &&  viewBox influent IE scaledSize_x000D_
  //var svg = '<svg width="32px" height="43px"  viewBox="0 0 32 43" xmlns="http://www.w3.org/2000/svg">'_x000D_
  //    + '<path style="fill:#FFFFFF;stroke:#020202;stroke-width:1;stroke-miterlimit:10;" d="M30.6,15.737c0-8.075-6.55-14.6-14.6-14.6c-8.075,0-14.601,6.55-14.601,14.6c0,4.149,1.726,7.875,4.5,10.524c1.8,1.801,4.175,4.301,5.025,5.625c1.75,2.726,5,11.976,5,11.976s3.325-9.25,5.1-11.976c0.825-1.274,3.05-3.6,4.825-5.399C28.774,23.813,30.6,20.012,30.6,15.737z"/>'_x000D_
  //    + '<circle style="fill:' + color + ';" cx="16" cy="16" r="11"/>'_x000D_
  //    + '<text x="16" y="20" text-anchor="middle" style="font-size:10px;fill:#FFFFFF;">' + text + '</text>'_x000D_
  //    + '</svg>';_x000D_
  //var imgSrc = 'data:image/svg+xml;charset=UTF-8,' + encodeURIComponent(svg);_x000D_
_x000D_
  var iconObj = {_x000D_
    size: new google.maps.Size(32, 43),_x000D_
    url: imgSrc,_x000D_
    scaledSize: new google.maps.Size(32, 43)_x000D_
  };_x000D_
_x000D_
  return iconObj;_x000D_
};
_x000D_ 
<!DOCTYPE html>_x000D_
<html>_x000D_
_x000D_
<head>_x000D_
  <meta charset="utf-8">_x000D_
  <title>Your Custom Marker </title>_x000D_
  <style>_x000D_
    /* Always set the map height explicitly to define the size of the div_x000D_
       * element that contains the map. */_x000D_
    #map {_x000D_
      height: 100%;_x000D_
    }_x000D_
    /* Optional: Makes the sample page fill the window. */_x000D_
    html,_x000D_
    body {_x000D_
      height: 100%;_x000D_
      margin: 0;_x000D_
      padding: 0;_x000D_
    }_x000D_
  </style>_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <div id="map"></div>_x000D_
    <script src="https://canvg.github.io/canvg/canvg.js"></script>_x000D_
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>_x000D_
    <script async defer src="https://maps.googleapis.com/maps/api/js?callback=initMap"></script>_x000D_
</body>_x000D_
_x000D_
</html>
_x000D_
_x000D_
_x000D_

How can I read a text file from the SD card in Android?

In response to

Don't hardcode /sdcard/

Sometimes we HAVE TO hardcode it as in some phone models the API method returns the internal phone memory.

Known types: HTC One X and Samsung S3.

Environment.getExternalStorageDirectory().getAbsolutePath() gives a different path - Android

How to unpublish an app in Google Play Developer Console

As per new Interface follow these steps

  1. Go to Google Play Developer Console
  2. Select your app you want to un-publish
  3. From the left Navigation Release >> Setup >> Advance Settings
  4. In the App Availability Check on Unpublished Radio button enter image description here

using .join method to convert array to string without commas

The .join() method has a parameter for the separator string. If you want it to be empty instead of the default comma, use

arr.join("");

Generating UNIQUE Random Numbers within a range

The "shuffle" method has a MAJOR FALW. When the numbers are big, shuffle 3 billion indexs will instantly CAUSE 500 error. Here comes a best solution for really big numbers.

function getRandomNumbers($min, $max, $total) {
    $temp_arr = array();
    while(sizeof($temp_arr) < $total) $temp_arr[rand($min, $max)] = true;
    return $temp_arr;
}

Say I want to get 10 unique random numbers from 1 billion to 4 billion.

$random_numbers = getRandomNumbers(1000000000,4000000000,10);

PS: Execution time: 0.027 microseconds

Leaflet - How to find existing markers, and delete markers?

In my case, I have various layer groups so that users can show/hide clusters of like type markers. But, in any case you delete an individual marker by looping over your layer groups to find and delete it. While looping, search for a marker with a custom attribute, in my case a 'key', added when the marker was added to the layer group. Add your 'key' just like adding a title attribute. Later this is gotten an a layer option. When you find that match, you .removeLayer() and it gets rid of that particular marker. Hope that helps you out!

eventsLayerGroup.addLayer(L.marker([tag.latitude, tag.longitude],{title:tag.title, layer:tag.layer, timestamp:tag.timestamp, key:tag.key, bounceOnAdd: true, icon: L.AwesomeMarkers.icon({icon: 'vignette', markerColor: 'blue', prefix: '', iconColor: 'white'}) }).bindPopup(customPopup(tag),customOptions).on('click', markerClick)); 

function removeMarker(id){
    var layerGroupsArray = [eventsLayerGroup,landmarksLayerGroup,travelerLayerGroup,marketplaceLayerGroup,myLayerGroup];
    $.each(layerGroupsArray, function (key, value) {
        value.eachLayer(function (layer) {
            if(typeof value !== "undefined"){
                if (layer.options.layer){
                    console.log(layer.options.key);
                    console.log(id);
                    if (id === layer.options.key){
                        value.removeLayer(layer);
                    }
                }
            }
        });
    });
}

Check if file is already open

On Windows I found the answer https://stackoverflow.com/a/13706972/3014879 using

fileIsLocked = !file.renameTo(file)

most useful, as it avoids false positives when processing write protected (or readonly) files.

What are pipe and tap methods in Angular tutorial?

You are right, the documentation lacks of those methods. However when I dug into rxjs repository, I found nice comments about tap (too long to paste here) and pipe operators:

  /**
   * Used to stitch together functional operators into a chain.
   * @method pipe
   * @return {Observable} the Observable result of all of the operators having
   * been called in the order they were passed in.
   *
   * @example
   *
   * import { map, filter, scan } from 'rxjs/operators';
   *
   * Rx.Observable.interval(1000)
   *   .pipe(
   *     filter(x => x % 2 === 0),
   *     map(x => x + x),
   *     scan((acc, x) => acc + x)
   *   )
   *   .subscribe(x => console.log(x))
   */

In brief:

Pipe: Used to stitch together functional operators into a chain. Before we could just do observable.filter().map().scan(), but since every RxJS operator is a standalone function rather than an Observable's method, we need pipe() to make a chain of those operators (see example above).

Tap: Can perform side effects with observed data but does not modify the stream in any way. Formerly called do(). You can think of it as if observable was an array over time, then tap() would be an equivalent to Array.forEach().

Print "hello world" every X seconds

I figure it out with a timer, hope it helps. I have used a timer from java.util.Timer and TimerTask from the same package. See below:

TimerTask task = new TimerTask() {

    @Override
    public void run() {
        System.out.println("Hello World");
    }
};

Timer timer = new Timer();
timer.schedule(task, new Date(), 3000);

How to connect to mysql with laravel?

Maybe you forgot to first create a table migrations:

php artisan migrate:install

Also there is a very userful package Generators, which makes a lot of work for you https://github.com/JeffreyWay/Laravel-4-Generators#views

log4net hierarchy and logging levels

Try like this, it worked for me 

<root>
  <!--<level value="ALL" />-->
  <level value="ERROR" />
  <level value="INFO" />
  <level value="WARN" />     
</root>

This logs 3 types of errors - error, info, and warning

500 Internal Server Error for php file not for html

I was having this problem because I was trying to connect to MySQL but I didn't have the required package. I figured it out because of @Amadan's comment to check the error log. In my case, I was having the error: Call to undefined function mysql_connect()

If your PHP file has any code to connect with a My-SQL db then you might need to install php5-mysql first. I was getting this error because I hadn't installed it. All my file permissions were good. In Ubuntu, you can install it by the following command:

sudo apt-get install php5-mysql

Display all post meta keys and meta values of the same post ID in wordpress

Default Usage

Get the meta for all keys:

<?php $meta = get_post_meta($post_id); ?>

Get the meta for a single key:

<?php $key_1_values = get_post_meta( 76, 'key_1' ); ?>

for example:

$myvals = get_post_meta($post_id);

foreach($myvals as $key=>$val)
{
    echo $key . ' : ' . $val[0] . '<br/>';
}

Note: some unwanted meta keys starting with "underscore(_)" will also come, so you will need to filter them out.

For reference: See Codex

How can I fix WebStorm warning "Unresolved function or method" for "require" (Firefox Add-on SDK)

For WebStorm 2019.3 File > Preferences or Settings > Languages & Frameworks > Node.js and NPM -> Enable Coding assitance for NodeJs

Note that the additional packages that you want to use are included.

JAVA_HOME and PATH are set but java -version still shows the old one

check available Java versions on your Linux system by using update-alternatives command:

 $ sudo update-alternatives --display java

Now that there are suitable candidates to change to, you can switch the default Java version among available Java JREs by running the following command:

 $ sudo update-alternatives --config java

When prompted, select the Java version you would like to use.1 or 2 or 3 or etc..

Now you can verify the default Java version changed as follows.

 $ java -version

IOException: Too many open files

The problem comes from your Java application (or a library you are using).

First, you should read the entire outputs (Google for StreamGobbler), and pronto!

Javadoc says:

The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.

Secondly, waitFor() your process to terminate. You then should close the input, output and error streams.

Finally destroy() your Process.

My sources:

How does OAuth 2 protect against things like replay attacks using the Security Token?

How OAuth 2.0 works in real life:

I was driving by Olaf's bakery on my way to work when I saw the most delicious donut in the window -- I mean, the thing was dripping chocolatey goodness. So I went inside and demanded "I must have that donut!". He said "sure that will be $30."

Yeah I know, $30 for one donut! It must be delicious! I reached for my wallet when suddenly I heard the chef yell "NO! No donut for you". I asked: why? He said he only accepts bank transfers.

Seriously? Yep, he was serious. I almost walked away right there, but then the donut called out to me: "Eat me, I'm delicious...". Who am I to disobey orders from a donut? I said ok.

He handed me a note with his name on it (the chef, not the donut): "Tell them Olaf sent you". His name was already on the note, so I don't know what the point of saying that was, but ok.

I drove an hour and a half to my bank. I handed the note to the teller; I told her Olaf sent me. She gave me one of those looks, the kind that says, "I can read".

She took my note, asked for my id, asked me how much money was ok to give him. I told her $30 dollars. She did some scribbling and handed me another note. This one had a bunch of numbers on it, I guessed that's how they keep track of the notes.

At that point I'm starving. I rushed out of there, an hour and a half later I was back, standing in front of Olaf with my note extended. He took it, looked it over and said, "I'll be back".

I thought he was getting my donut, but after 30 minutes I started to get suspicious. So I asked the guy behind the counter "Where's Olaf?". He said "He went to get money". "What do you mean?". "He take note to bank".

Huh... so Olaf took the note that the bank gave me and went back to the bank to get money out of my account. Since he had the note the bank gave me, the bank knew he was the guy I was talking about, and because I spoke with the bank they knew to only give him $30.

It must have taken me a long time to figure that out because by the time I looked up, Olaf was standing in front of me finally handing me my donut. Before I left I had to ask, "Olaf, did you always sell donuts this way?". "No, I used to do it different."

Huh. As I was walking back to my car my phone rang. I didn't bother answering, it was probably my job calling to fire me, my boss is such a ***. Besides, I was caught up thinking about the process I just went through.

I mean think about it: I was able to let Olaf take $30 out of my bank account without having to give him my account information. And I didn't have to worry that he would take out too much money because I already told the bank he was only allowed to take $30. And the bank knew he was the right guy because he had the note they gave me to give to Olaf.

Ok, sure I would rather hand him $30 from my pocket. But now that he had that note I could just tell the bank to let him take $30 every week, then I could just show up at the bakery and I didn't have to go to the bank anymore. I could even order the donut by phone if I wanted to.

Of course I'd never do that -- that donut was disgusting.

I wonder if this approach has broader applications. He mentioned this was his second approach, I could call it Olaf 2.0. Anyway I better get home, I gotta start looking for a new job. But not before I get one of those strawberry shakes from that new place across town, I need something to wash away the taste of that donut.

Split List into Sublists with LINQ

I think the following suggestion would be the fastest. I am sacrificing the lazyness of the source Enumerable for the ability to use Array.Copy and knowing ahead of the time the length of each of my sublists.

public static IEnumerable<T[]> Chunk<T>(this IEnumerable<T> items, int size)
{
    T[] array = items as T[] ?? items.ToArray();
    for (int i = 0; i < array.Length; i+=size)
    {
        T[] chunk = new T[Math.Min(size, array.Length - i)];
        Array.Copy(array, i, chunk, 0, chunk.Length);
        yield return chunk;
    }
}

How to include libraries in Visual Studio 2012?

Typically you need to do 5 things to include a library in your project:

1) Add #include statements necessary files with declarations/interfaces, e.g.:

#include "library.h"

2) Add an include directory for the compiler to look into

-> Configuration Properties/VC++ Directories/Include Directories (click and edit, add a new entry)

3) Add a library directory for *.lib files:

-> project(on top bar)/properties/Configuration Properties/VC++ Directories/Library Directories (click and edit, add a new entry)

4) Link the lib's *.lib files

-> Configuration Properties/Linker/Input/Additional Dependencies (e.g.: library.lib;

5) Place *.dll files either:

-> in the directory you'll be opening your final executable from or into Windows/system32

Pass a PHP variable value through an HTML form

EDIT: After your comments, I understand that you want to pass variable through your form.

You can do this using hidden field:

<input type='hidden' name='var' value='<?php echo "$var";?>'/>

In PHP action File:

<?php 
   if(isset($_POST['var'])) $var=$_POST['var'];
?>

Or using sessions: In your first page:

 $_SESSION['var']=$var;

start_session(); should be placed at the beginning of your php page.

In PHP action File:

if(isset($_SESSION['var'])) $var=$_SESSION['var'];

First Answer:

You can also use $GLOBALS :

if (isset($_POST['save_exit']))
{

   echo $GLOBALS['var']; 

}

Check this documentation for more informations.

Calling one Bash script from another Script passing it arguments with quotes and spaces

I found following program works for me 

test1.sh 
a=xxx
test2.sh $a

in test2.sh you use $1 to refer variable a in test1.sh

echo $1

The output would be xxx

How do I delete a Git branch locally and remotely?

A one-liner command to delete both local, and remote:

D=branch-name; git branch -D $D; git push origin :$D

Or add the alias below to your ~/.gitconfig. Usage: git kill branch-name

[alias]
    kill = "!f(){ git branch -D \"$1\";  git push origin --delete \"$1\"; };f"

how to clear the screen in python

If you mean the screen where you have that interpreter prompt >>> you can do CTRL+L on Bash shell can help. Windows does not have equivalent. You can do 

import os
os.system('cls')  # on windows

or

os.system('clear')  # on linux / os x

Dockerfile copy keep subdirectory structure

Alternatively you can use a "." instead of *, as this will take all the files in the working directory, include the folders and subfolders:

FROM ubuntu
COPY . /
RUN ls -la /

Show week number with Javascript?

With that code you can simply;

document.write(dayNames[now.getDay()] + " (" + now.getWeek() + ").");

(You will need to paste the getWeek function above your current script)

How to add a recyclerView inside another recyclerView

I ran into similar problem a while back and what was happening in my case was the outer recycler view was working perfectly fine but the the adapter of inner/second recycler view had minor issues all the methods like constructor got initiated and even getCount() method was being called, although the final methods responsible to generate view ie..

1. onBindViewHolder() methods never got called. --> Problem 1.

2. When it got called finally it never show the list items/rows of recycler view. --> Problem 2.

Reason why this happened :: When you put a recycler view inside another recycler view, then height of the first/outer recycler view is not auto adjusted. It is defined when the first/outer view is created and then it remains fixed. At that point your second/inner recycler view has not yet loaded its items and thus its height is set as zero and never changes even when it gets data. Then when onBindViewHolder() in your second/inner recycler view is called, it gets items but it doesn't have the space to show them because its height is still zero. So the items in the second recycler view are never shown even when the onBindViewHolder() has added them to it.

Solution :: you have to create your custom LinearLayoutManager for the second recycler view and that is it. To create your own LinearLayoutManager: Create a Java class with the name CustomLinearLayoutManager and paste the code below into it. NO CHANGES REQUIRED

public class CustomLinearLayoutManager extends LinearLayoutManager {

    private static final String TAG = CustomLinearLayoutManager.class.getSimpleName();

    public CustomLinearLayoutManager(Context context) {
        super(context);

    }

    public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    private int[] mMeasuredDimension = new int[2];

    @Override
    public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) {

        final int widthMode = View.MeasureSpec.getMode(widthSpec);
        final int heightMode = View.MeasureSpec.getMode(heightSpec);
        final int widthSize = View.MeasureSpec.getSize(widthSpec);
        final int heightSize = View.MeasureSpec.getSize(heightSpec);

        int width = 0;
        int height = 0;
        for (int i = 0; i < getItemCount(); i++) {
            measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                    mMeasuredDimension);


            if (getOrientation() == HORIZONTAL) {
                width = width + mMeasuredDimension[0];
                if (i == 0) {
                    height = mMeasuredDimension[1];
                }
            } else {
                height = height + mMeasuredDimension[1];
                if (i == 0) {
                    width = mMeasuredDimension[0];
                }
            }
        }
        switch (widthMode) {
            case View.MeasureSpec.EXACTLY:
                width = widthSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        switch (heightMode) {
            case View.MeasureSpec.EXACTLY:
                height = heightSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        setMeasuredDimension(width, height);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                                   int heightSpec, int[] measuredDimension) {
        try {
            View view = recycler.getViewForPosition(position);

            if (view != null) {
                RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();

                int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                        getPaddingLeft() + getPaddingRight(), p.width);

                int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                        getPaddingTop() + getPaddingBottom(), p.height);

                view.measure(childWidthSpec, childHeightSpec);
                measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
                measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                recycler.recycleView(view);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

How can I count the number of characters in a Bash variable

Use the wc utility with the print the byte counts (-c) option:

$ SO="stackoverflow"
$ echo -n "$SO" | wc -c
    13

You'll have to use the do not output the trailing newline (-n) option for echo. Otherwise, the newline character will also be counted.

How to override !important?

The !important should only be used when you have selectors in your style sheet with conflicting specificity.

But even when you have conflicting specificity, it is better to create a more specific selector for the exception. In your case it's better to have a class in your HTML which you can use to create a more specific selector which doesn't need the !important rule.

td.a-semantic-class-name { height: 100px; }

I personally never use !important in my style sheets. Remember that the C in CSS is for cascading. Using !important will break this.

How to check for an active Internet connection on iOS or macOS?

I've used the code in this discussion, and it seems to work fine (read the whole thread!).

I haven't tested it exhaustively with every conceivable kind of connection (like ad hoc Wi-Fi).

How do I find all of the symlinks in a directory tree?

What I do is create a script in my bin directory that is like an alias. For example I have a script named lsd ls -l | grep ^d

you could make one lsl ls -lR | grep ^l

Just chmod them +x and you are good to go.

Regular Expression to match valid dates

Sounds like you're overextending regex for this purpose. What I would do is use a regex to match a few date formats and then use a separate function to validate the values of the date fields so extracted.

Optional Parameters in Web Api Attribute Routing

Another info: If you want use a Route Constraint, imagine that you want force that parameter has int datatype, then you need use this syntax:

[Route("v1/location/**{deviceOrAppid:int?}**", Name = "AddNewLocation")]

The ? character is put always before the last } character

For more information see: Optional URI Parameters and Default Values

Linq select object from list depending on objects attribute

I think you are looking for this?

var correctAnswer = Answers.First(a => a.Correct);

You can use single by typing :

var correctAnswer = Answers.Single(a => a.Correct);

How can I style the border and title bar of a window in WPF?

I found a more straight forward solution from @DK comment in this question, the solution is written by Alex and described here with source, To make customized window:

  1. download the sample project here
  2. edit the generic.xaml file to customize the layout.
  3. enjoy :).

javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure

Issue resolved.!!! Below are the solutions.

For Java 6: Add below jars into {JAVA_HOME}/jre/lib/ext. 1. bcprov-ext-jdk15on-154.jar 2. bcprov-jdk15on-154.jar

Add property into {JAVA_HOME}/jre/lib/security/java.security security.provider.1=org.bouncycastle.jce.provider.BouncyCastleProvider

Java 7:download jar from below link and add to {JAVA_HOME}/jre/lib/security http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html

Java 8:download jar from below link and add to {JAVA_HOME}/jre/lib/security http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html

Issue is that it is failed to decrypt 256 bits of encryption.

Unsupported method: BaseConfig.getApplicationIdSuffix()

Alright I figured out how to fix this issue.

  • Open build.gradle and change the gradle version to the recommended version:
    classpath 'com.android.tools.build:gradle:1.3.0' to
    classpath 'com.android.tools.build:gradle:2.3.2'
  • Hit 'Try Again'
  • In the messages box it'll say 'Fix Gradle Wrapper and re-import project' Click that, since the minimum gradle version is 3.3
  • A new error will popup and say The SDK Build Tools revision (23.0.1) is too low for project ':app'. Minimum required is 25.0.0 - Hit Update Build Tools version and sync project
  • A window may popup that says Android Gradle Plugin Update recommended, just update from there.

Now the project should be runnable now on any of your android virtual devices.

Module 'tensorflow' has no attribute 'contrib'

I used google colab to run my models and everything was perfect untill i used inline tesorboard. With tensorboard inline, I had the same issue of "Module 'tensorflow' has no attribute 'contrib'".

It was able to run training when rebuild and reinstall the model using setup.py(research folder) after initialising tensorboard.

How to convert a Django QuerySet to a list

Why not just call list() on the Queryset?

answers_list = list(answers)

This will also evaluate the QuerySet/run the query. You can then remove/add from that list.

Django: Model Form "object has no attribute 'cleaned_data'"

At times, if we forget the

return self.cleaned_data

in the clean function of django forms, we will not have any data though the form.is_valid() will return True.

Jersey client: How to add a list as query parameter

GET Request with JSON Query Param

package com.rest.jersey.jerseyclient;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;

public class JerseyClientGET {

    public static void main(String[] args) {
        try {               

            String BASE_URI="http://vaquarkhan.net:8080/khanWeb";               
            Client client = Client.create();    
            WebResource webResource = client.resource(BASE_URI);

            ClientResponse response = webResource.accept("application/json").get(ClientResponse.class);

            /*if (response.getStatus() != 200) {
               throw new RuntimeException("Failed : HTTP error code : "
                + response.getStatus());
            }
*/
            String output = webResource.path("/msg/sms").queryParam("search","{\"name\":\"vaquar\",\"surname\":\"khan\",\"ext\":\"2020\",\"age\":\"34\""}").get(String.class);
            //String output = response.getEntity(String.class);

            System.out.println("Output from Server .... \n");
            System.out.println(output);                         

        } catch (Exception e) {

            e.printStackTrace();    
        }    
    }    
}

Post Request :

package com.rest.jersey.jerseyclient;

import com.rest.jersey.dto.KhanDTOInput;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.api.json.JSONConfiguration;

public class JerseyClientPOST {

    public static void main(String[] args) {
        try {

            KhanDTOInput khanDTOInput = new KhanDTOInput("vaquar", "khan", "20", "E", null, "2222", "8308511500");                      

            ClientConfig clientConfig = new DefaultClientConfig();

            clientConfig.getFeatures().put( JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);

            Client client = Client.create(clientConfig);

               // final HTTPBasicAuthFilter authFilter = new HTTPBasicAuthFilter(username, password);
               // client.addFilter(authFilter);
               // client.addFilter(new LoggingFilter());

            //
            WebResource webResource = client
                    .resource("http://vaquarkhan.net:12221/khanWeb/messages/sms/api/v1/userapi");

              ClientResponse response = webResource.accept("application/json")
                .type("application/json").put(ClientResponse.class, khanDTOInput);


            if (response.getStatus() != 200) {
                throw new RuntimeException("Failed : HTTP error code :" + response.getStatus());
            }

            String output = response.getEntity(String.class);

            System.out.println("Server response .... \n");
            System.out.println(output);

        } catch (Exception e) {

            e.printStackTrace();

        }    
    }    
}

IntelliJ: Never use wildcard imports

If you don't want to change preferences, you can optimize imports by pressing Ctrl+Option+o on Mac or Ctrl+Alt+o on Windows/Linux and this will replace all imports with single imports in current file.

How to loop through all the properties of a class?

Here's another way to do it, using a LINQ lambda:

C#:

SomeObject.GetType().GetProperties().ToList().ForEach(x => Console.WriteLine($"{x.Name} = {x.GetValue(SomeObject, null)}"));

VB.NET:

SomeObject.GetType.GetProperties.ToList.ForEach(Sub(x) Console.WriteLine($"{x.Name} = {x.GetValue(SomeObject, Nothing)}"))

Difference of keywords 'typename' and 'class' in templates?

typename and class are interchangeable in the basic case of specifying a template:

template<class T>
class Foo
{
};

and

template<typename T>
class Foo
{
};

are equivalent.

Having said that, there are specific cases where there is a difference between typename and class.

The first one is in the case of dependent types. typename is used to declare when you are referencing a nested type that depends on another template parameter, such as the typedef in this example:

template<typename param_t>
class Foo
{
    typedef typename param_t::baz sub_t;
};

The second one you actually show in your question, though you might not realize it:

template < template < typename, typename > class Container, typename Type >

When specifying a template template, the class keyword MUST be used as above -- it is not interchangeable with typename in this case (note: since C++17 both keywords are allowed in this case).

You also must use class when explicitly instantiating a template:

template class Foo<int>;

I'm sure that there are other cases that I've missed, but the bottom line is: these two keywords are not equivalent, and these are some common cases where you need to use one or the other.

php: loop through json array

Set the second function parameter to true if you require an associative array

Some versions of php require a 2nd paramter of true if you require an associative array

$json  = '[{"var1":"9","var2":"16","var3":"16"},{"var1":"8","var2":"15","var3":"15"}]';
$array = json_decode( $json, true );

javascript: calculate x% of a number

Your percentage divided by 100 (to get the percentage between 0 and 1) times by the number

35.8/100*10000

How do I evenly add space between a label and the input field regardless of length of text?

You can also used below code 

<html>
<head>
    <style>
        .labelClass{
            float: left;
            width: 113px;
        }
    </style>
</head>
<body>
  <form action="yourclassName.jsp">
    <span class="labelClass">First name: </span><input type="text" name="fname"><br>
    <span class="labelClass">Last name: </span><input type="text" name="lname"><br>
    <input type="submit" value="Submit">
  </form>
</body>
</html>

How to read PDF files using Java?

with Apache PDFBox it goes like this:

PDDocument document = PDDocument.load(new File("test.pdf"));
if (!document.isEncrypted()) {
    PDFTextStripper stripper = new PDFTextStripper();
    String text = stripper.getText(document);
    System.out.println("Text:" + text);
}
document.close();

Is there any quick way to get the last two characters in a string?

 
theString.substring(theString.length() - 2)

Use CASE statement to check if column exists in table - SQL Server

 
SELECT *
FROM ...
WHERE EXISTS(SELECT 1 
        FROM sys.columns c
        WHERE c.[object_id] = OBJECT_ID('dbo.Tags')
            AND c.name = 'ModifiedByUser'
    )

Ternary operator in PowerShell

If you're just looking for a syntactically simple way to assign/return a string or numeric based on a boolean condition, you can use the multiplication operator like this:

"Condition is "+("true"*$condition)+("false"*!$condition)
(12.34*$condition)+(56.78*!$condition)

If you're only ever interested in the result when something is true, you can just omit the false part entirely (or vice versa), e.g. a simple scoring system:

$isTall = $true
$isDark = $false
$isHandsome = $true

$score = (2*$isTall)+(4*$isDark)+(10*$isHandsome)
"Score = $score"
# or
# "Score = $((2*$isTall)+(4*$isDark)+(10*$isHandsome))"

Note that the boolean value should not be the leading term in the multiplication, i.e. $condition*"true" etc. won't work.

Shell Scripting: Using a variable to define a path

Don't use spaces...

(Incorrect)

SPTH = '/home/Foo/Documents/Programs/ShellScripts/Butler'

(Correct)

SPTH='/home/Foo/Documents/Programs/ShellScripts/Butler'

How do I watch a file for changes?

It should not work on windows (maybe with cygwin ?), but for unix user, you should use the "fcntl" system call. Here is an example in Python. It's mostly the same code if you need to write it in C (same function names)

import time
import fcntl
import os
import signal

FNAME = "/HOME/TOTO/FILETOWATCH"

def handler(signum, frame):
    print "File %s modified" % (FNAME,)

signal.signal(signal.SIGIO, handler)
fd = os.open(FNAME,  os.O_RDONLY)
fcntl.fcntl(fd, fcntl.F_SETSIG, 0)
fcntl.fcntl(fd, fcntl.F_NOTIFY,
            fcntl.DN_MODIFY | fcntl.DN_CREATE | fcntl.DN_MULTISHOT)

while True:
    time.sleep(10000)

Finding the index of elements based on a condition using python list comprehension

For me it works well:

>>> import numpy as np
>>> a = np.array([1, 2, 3, 1, 2, 3])
>>> np.where(a > 2)[0]
[2 5]

How to run travis-ci locally

Use wwtd (what would travis do) ruby gem to run tests on your local machine roughly as they would run on travis.

It will recreate the build matrix and run each configuration, great to sanity check setup before pushing.

gem i wwtd
wwtd

Saving image to file

If you are drawing on the Graphics of the Control than you should do something draw on the Bitmap everything you are drawing on the canvas, but have in mind that Bitmap needs to be the exact size of the control you are drawing on:

  Bitmap bmp = new Bitmap(myControl.ClientRectangle.Width,myControl.ClientRectangle.Height);
  Graphics gBmp = Graphics.FromImage(bmp);
  gBmp.DrawEverything(); //this is your code for drawing
  gBmp.Dispose();
  bmp.Save("image.png", ImageFormat.Png);

Or you can use a DrawToBitmap method of the Control. Something like this:

Bitmap bmp = new Bitmap(myControl.ClientRectangle.Width, myControl.ClientRectangle.Height);
myControl.DrawToBitmap(bmp,new Rectangle(0,0,bmp.Width,bmp.Height));
bmp.Save("image.png", ImageFormat.Png);

mysql alphabetical order

MySQL solution:

select Name from Employee order by Name ;

Order by will order the names from a to z.

Is a Java hashmap search really O(1)?

We've established that the standard description of hash table lookups being O(1) refers to the average-case expected time, not the strict worst-case performance. For a hash table resolving collisions with chaining (like Java's hashmap) this is technically O(1+a) with a good hash function, where a is the table's load factor. Still constant as long as the number of objects you're storing is no more than a constant factor larger than the table size.

It's also been explained that strictly speaking it's possible to construct input that requires O(n) lookups for any deterministic hash function. But it's also interesting to consider the worst-case expected time, which is different than average search time. Using chaining this is O(1 + the length of the longest chain), for example T(log n / log log n) when a=1.

If you're interested in theoretical ways to achieve constant time expected worst-case lookups, you can read about dynamic perfect hashing which resolves collisions recursively with another hash table!