Programs & Examples On #Technical debt

The term "technical debt" was coined by Ward Cunningham to describe the obligation that a software organization incurs when it chooses a design or construction approach that's expedient in the short term but that increases complexity and is more costly in the long term.

Failure during conversion to COFF: file invalid or corrupt

Do you have Visual Studio 2012 installed as well? If so, 2012 stomps your 2010 IDE, possibly because of compatibility issues with .NET 4.5 and .NET 4.0.

See http://social.msdn.microsoft.com/Forums/da-DK/vssetup/thread/d10adba0-e082-494a-bb16-2bfc039faa80

The transaction manager has disabled its support for remote/network transactions

I post the below solution here because after some searching this is where I landed, so other may too. I was trying to use EF 6 to call a stored procedure, but had a similar error because the stored procedure had a linked server being utilized.

The operation could not be performed because OLE DB provider _ for linked server _ was unable to begin a distributed transaction

The partner transaction manager has disabled its support for remote/network transactions*

Jumping over to SQL Client did fix my issue, which also confirmed for me that it was an EF thing.

EF model generated method based attempt:

db.SomeStoredProcedure();

ExecuteSqlCommand based attempt:

db.Database.ExecuteSqlCommand("exec [SomeDB].[dbo].[SomeStoredProcedure]");

With:

var connectionString = db.Database.Connection.ConnectionString;
var connection = new System.Data.SqlClient.SqlConnection(connectionString);    
var cmd = connection.CreateCommand();
cmd.CommandText = "exec [SomeDB].[dbo].[SomeStoredProcedure]";

connection.Open();
var result = cmd.ExecuteNonQuery();

That code can be shortened, but I think that version is slightly more convenient for debugging and stepping through.

I don't believe that Sql Client is necessarily a preferred choice, but I felt this was at least worth sharing if anyone else having similar problems gets landed here by google.

The above Code is C#, but the concept of trying to switch over to Sql Client still applies. At the very least it will be diagnostic to attempt to do so.

Should I URL-encode POST data?

Above posts answers questions related to URL Encoding and How it works, but the original questions was "Should I URL-encode POST data?" which isn't answered.

From my recent experience with URL Encoding, I would like to extend the question further. "Should I URL-encode POST data, same as GET HTTP method. Generally, HTML Forms over the Browser if are filled, submitted and/or GET some information, Browsers will do URL Encoding but If an application exposes a web-service and expects Consumers to do URL-Encoding on data, is it Architecturally and Technically correct to do URL Encode with POST HTTP method ?"

MySQL - Rows to Columns

Taking advantage of Matt Fenwick's idea that helped me to solve the problem (a lot of thanks), let's reduce it to only one query:

select
    history.*,
    coalesce(sum(case when itemname = "A" then itemvalue end), 0) as A,
    coalesce(sum(case when itemname = "B" then itemvalue end), 0) as B,
    coalesce(sum(case when itemname = "C" then itemvalue end), 0) as C
from history
group by hostid

How do you decompile a swf file

erlswf is an opensource project written in erlang for decompiling .swf files.

Here's the site: https://github.com/bef/erlswf

Explicit Return Type of Lambda

You can have more than one statement when still return:

[]() -> your_type {return (
        your_statement,
        even_more_statement = just_add_comma,
        return_value);}

http://www.cplusplus.com/doc/tutorial/operators/#comma

How to run .APK file on emulator

Start an Android Emulator (make sure that all supported APIs are included when you created the emulator, we needed to have the Google APIs for instance).

Then simply email yourself a link to the .apk file, and download it directly in the emulator, and click the downloaded file to install it.

Traits vs. interfaces

You can consider a trait as an automated "copy-paste" of code, basically.

Using traits is dangerous since there is no mean to know what it does before execution.

However, traits are more flexible because of their lack of limitations such as inheritance.

Traits can be useful to inject a method which checks something into a class, for example, the existence of another method or attribute. A nice article on that (but in French, sorry).

For French-reading people who can get it, the GNU/Linux Magazine HS 54 has an article on this subject.

java SSL and cert keystore

System.setProperty("javax.net.ssl.trustStore", path_to_your_jks_file);

How to import jquery using ES6 syntax?

Import the entire JQuery's contents in the Global scope. This inserts $ into the current scope, containing all the exported bindings from the JQuery.

import * as $ from 'jquery';

Now the $ belongs to the window object.

How to handle the new window in Selenium WebDriver using Java?

                string BaseWindow = driver.CurrentWindowHandle;
                ReadOnlyCollection<string> handles = driver.WindowHandles;
                foreach (string handle in handles)
                {
                    if (handle != BaseWindow)
                    {
                        string title = driver.SwitchTo().Window(handle).Title;
                        Thread.Sleep(3000);
                        driver.SwitchTo().Window(handle).Title.Equals(title);
                        Thread.Sleep(3000);
                    }
                }

How can I see the current value of my $PATH variable on OS X?

Use the command:

 echo $PATH

and you will see all path:

/Users/name/.rvm/gems/ruby-2.5.1@pe/bin:/Users/name/.rvm/gems/ruby-2.5.1@global/bin:/Users/sasha/.rvm/rubies/ruby-2.5.1/bin:/Users/sasha/.rvm/bin:

How to extract string following a pattern with grep, regex or perl

Since you need to match content without including it in the result (must match name=" but it's not part of the desired result) some form of zero-width matching or group capturing is required. This can be done easily with the following tools:

Perl

With Perl you could use the n option to loop line by line and print the content of a capturing group if it matches:

perl -ne 'print "$1\n" if /name="(.*?)"/' filename

GNU grep

If you have an improved version of grep, such as GNU grep, you may have the -P option available. This option will enable Perl-like regex, allowing you to use \K which is a shorthand lookbehind. It will reset the match position, so anything before it is zero-width.

grep -Po 'name="\K.*?(?=")' filename

The o option makes grep print only the matched text, instead of the whole line.

Vim - Text Editor

Another way is to use a text editor directly. With Vim, one of the various ways of accomplishing this would be to delete lines without name= and then extract the content from the resulting lines:

:v/.*name="\v([^"]+).*/d|%s//\1

Standard grep

If you don't have access to these tools, for some reason, something similar could be achieved with standard grep. However, without the look around it will require some cleanup later:

grep -o 'name="[^"]*"' filename

A note about saving results

In all of the commands above the results will be sent to stdout. It's important to remember that you can always save them by piping it to a file by appending:

> result

to the end of the command.

Django Template Variables and Javascript

For a JavaScript object stored in a Django field as text, which needs to again become a JavaScript object dynamically inserted into on-page script, you need to use both escapejs and JSON.parse():

var CropOpts = JSON.parse("{{ profile.last_crop_coords|escapejs }}");

Django's escapejs handles the quoting properly, and JSON.parse() converts the string back into a JS object.

Refresh DataGridView when updating data source

Alexander Abakumov's answer is the correct one. It solved every binding issue I had updating the underlying data and having the grid update.

Its easy to implement and modify any existing source code you have.

grdDetails.DataSource = new System.Windows.Forms.BindingSource { DataSource = OrderDetails };

C# Java HashMap equivalent

Check out the documentation on MSDN for the Hashtable class.

Represents a collection of key-and-value pairs that are organized based on the hash code of the key.

Also, keep in mind that this is not thread-safe.

Get property value from C# dynamic object by string (reflection?)

IF d was created by Newtonsoft you can use this to read property names and values:

    foreach (JProperty property in d)
    {
        DoSomething(property.Name, property.Value);
    }

Windows recursive grep command-line

Select-String worked best for me. All the other options listed here, such as findstr, didn't work with large files.

Here's an example:

select-string -pattern "<pattern>" -path "<path>"

note: This requires Powershell

How to open a URL in a new Tab using JavaScript or jQuery?

You can easily create a new tab; do like the following:

function newTab() {
     var form = document.createElement("form");
     form.method = "GET";
     form.action = "http://www.example.com";
     form.target = "_blank";
     document.body.appendChild(form);
     form.submit();
}

urllib2 and json

Messa's answer only works if the server isn't bothering to check the content-type header. You'll need to specify a content-type header if you want it to really work. Here's Messa's answer modified to include a content-type header:

import json
import urllib2
data = json.dumps([1, 2, 3])
req = urllib2.Request(url, data, {'Content-Type': 'application/json'})
f = urllib2.urlopen(req)
response = f.read()
f.close()

PHP Converting Integer to Date, reverse of strtotime

Can you try this,

echo date("Y-m-d H:i:s", 1388516401);

As noted by theGame,

This means that you pass in a string value for the time, and optionally a value for the current time, which is a UNIX timestamp. The value that is returned is an integer which is a UNIX timestamp.

echo strtotime("2014-01-01 00:00:01");

This will return into the value 1388516401, which is the UNIX timestamp for the date 2014-01-01. This can be confirmed using the date() function as like below:

echo date('Y-m-d', 1198148400); // echos 2014-01-01

How to Compare two Arrays are Equal using Javascript?

You could try this simple approach

_x000D_
_x000D_
var array1 = [4,8,9,10];_x000D_
var array2 = [4,8,9,10];_x000D_
_x000D_
console.log(array1.join('|'));_x000D_
console.log(array2.join('|'));_x000D_
_x000D_
if (array1.join('|') === array2.join('|')) {_x000D_
 console.log('The arrays are equal.');_x000D_
} else {_x000D_
 console.log('The arrays are NOT equal.');_x000D_
}_x000D_
_x000D_
array1 = [[1,2],[3,4],[5,6],[7,8]];_x000D_
array2 = [[1,2],[3,4],[5,6],[7,8]];_x000D_
_x000D_
console.log(array1.join('|'));_x000D_
console.log(array2.join('|'));_x000D_
_x000D_
if (array1.join('|') === array2.join('|')) {_x000D_
 console.log('The arrays are equal.');_x000D_
} else {_x000D_
 console.log('The arrays are NOT equal.');_x000D_
}
_x000D_
_x000D_
_x000D_

If the position of the values are not important you could sort the arrays first.

if (array1.sort().join('|') === array2.sort().join('|')) {
    console.log('The arrays are equal.');
} else {
    console.log('The arrays are NOT equal.');
}

T-SQL: Selecting rows to delete via joins

It's almost the same in MySQL, but you have to use the table alias right after the word "DELETE":

DELETE a
FROM TableA AS a
INNER JOIN TableB AS b
ON a.BId = b.BId
WHERE [filter condition]

Retrieving Dictionary Value Best Practices

I imagine that trygetvalue is doing something more like:

if(myDict.ReallyOptimisedVersionofContains(someKey))
{ 
  someVal = myDict[someKey];
  return true;
}
return false;

So hopefully no try/catch anywhere.

I think it is just a method of convenience really. I generally use it as it saves a line of code or two.

How can I escape white space in a bash loop list?

Just had a simple variant problem... Convert files of typed .flv to .mp3 (yawn).

for file in read `find . *.flv`; do ffmpeg -i ${file} -acodec copy ${file}.mp3;done

recursively find all the Macintosh user flash files and turn them into audio (copy, no transcode) ... it's like the while above, noting that read instead of just 'for file in ' will escape.

How to capitalize the first letter of text in a TextView in an Android Application

Please create a custom TextView and use it :

public class CustomTextView extends TextView {

    public CapitalizedTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        if (text.length() > 0) {
            text = String.valueOf(text.charAt(0)).toUpperCase() + text.subSequence(1, text.length());
        }
        super.setText(text, type);
    }
}

Global variables in AngularJS

You've got basically 2 options for "global" variables:

$rootScope is a parent of all scopes so values exposed there will be visible in all templates and controllers. Using the $rootScope is very easy as you can simply inject it into any controller and change values in this scope. It might be convenient but has all the problems of global variables.

Services are singletons that you can inject to any controller and expose their values in a controller's scope. Services, being singletons are still 'global' but you've got far better control over where those are used and exposed.

Using services is a bit more complex, but not that much, here is an example:

var myApp = angular.module('myApp',[]);
myApp.factory('UserService', function() {
  return {
      name : 'anonymous'
  };
});

and then in a controller:

function MyCtrl($scope, UserService) {
    $scope.name = UserService.name;
}

Here is the working jsFiddle: http://jsfiddle.net/pkozlowski_opensource/BRWPM/2/

Python: how can I check whether an object is of type datetime.date?

right way is

import datetime
isinstance(x, datetime.date)

When I try this on my machine it works fine. You need to look into why datetime.date is not a class. Are you perhaps masking it with something else? or not referencing it correctly for your import?

HikariCP - connection is not available

I managed to fix it finally. The problem is not related to HikariCP. The problem persisted because of some complex methods in REST controllers executing multiple changes in DB through JPA repositories. For some reasons calls to these interfaces resulted in a growing number of "freezed" active connections, exhausting the pool. Either annotating these methods as @Transactional or enveloping all the logic in a single call to transactional service method seem to solve the problem.

How to find the path of the local git repository when I am possibly in a subdirectory

git rev-parse --show-toplevel

could be enough if executed within a git repo.
From git rev-parse man page:

--show-toplevel

Show the absolute path of the top-level directory.

For older versions (before 1.7.x), the other options are listed in "Is there a way to get the git root directory in one command?":

git rev-parse --git-dir

That would give the path of the .git directory.


The OP mentions:

git rev-parse --show-prefix

which returns the local path under the git repo root. (empty if you are at the git repo root)


Note: for simply checking if one is in a git repo, I find the following command quite expressive:

git rev-parse --is-inside-work-tree

And yes, if you need to check if you are in a .git git-dir folder:

git rev-parse --is-inside-git-dir

Can't push to the heroku

If you are a python user -
Create a requirements.txt file preferably using pip freeze > requirements.txt.
Add, commit and try pushing it again.

If this doesn't work try deleting .git (beware this might remove the associated git history) and follow the above steps again.

Worked for me.

Compare if BigDecimal is greater than zero

Possible better way:

if (value.signum() > 0)

signum returns -1, 0, or 1 as the value of this BigDecimal is negative, zero, or positive.

Print Pdf in C#

I wrote and released a small Nuget Package which can be used to print a PDF file to a printerdriver. It can also print to a XPS file or PDF file. Here is a link to it.

How can I pop-up a print dialog box using Javascript?

window.print();  

unless you mean a custom looking popup.

React Native add bold or italics to single words in <Text> field

You can use <Text> like a container for your other text components. This is example:

...
<Text>
  <Text>This is a sentence</Text>
  <Text style={{fontWeight: "bold"}}> with</Text>
  <Text> one word in bold</Text>
</Text>
...

Here is an example.

What are rvalues, lvalues, xvalues, glvalues, and prvalues?

INTRODUCTION

ISOC++11 (officially ISO/IEC 14882:2011) is the most recent version of the standard of the C++ programming language. It contains some new features, and concepts, for example:

  • rvalue references
  • xvalue, glvalue, prvalue expression value categories
  • move semantics

If we would like to understand the concepts of the new expression value categories we have to be aware of that there are rvalue and lvalue references. It is better to know rvalues can be passed to non-const rvalue references.

int& r_i=7; // compile error
int&& rr_i=7; // OK

We can gain some intuition of the concepts of value categories if we quote the subsection titled Lvalues and rvalues from the working draft N3337 (the most similar draft to the published ISOC++11 standard).

3.10 Lvalues and rvalues [basic.lval]

1 Expressions are categorized according to the taxonomy in Figure 1.

  • An lvalue (so called, historically, because lvalues could appear on the left-hand side of an assignment expression) designates a function or an object. [ Example: If E is an expression of pointer type, then *E is an lvalue expression referring to the object or function to which E points. As another example, the result of calling a function whose return type is an lvalue reference is an lvalue. —end example ]
  • An xvalue (an “eXpiring” value) also refers to an object, usually near the end of its lifetime (so that its resources may be moved, for example). An xvalue is the result of certain kinds of expressions involving rvalue references (8.3.2). [ Example: The result of calling a function whose return type is an rvalue reference is an xvalue. —end example ]
  • A glvalue (“generalized” lvalue) is an lvalue or an xvalue.
  • An rvalue (so called, historically, because rvalues could appear on the right-hand side of an assignment expression) is an xvalue, a
    temporary object (12.2) or subobject thereof, or a value that is not
    associated with an object.
  • A prvalue (“pure” rvalue) is an rvalue that is not an xvalue. [ Example: The result of calling a function whose return type is not a
    reference is a prvalue. The value of a literal such as 12, 7.3e5, or
    true is also a prvalue. —end example ]

Every expression belongs to exactly one of the fundamental classifications in this taxonomy: lvalue, xvalue, or prvalue. This property of an expression is called its value category.

But I am not quite sure about that this subsection is enough to understand the concepts clearly, because "usually" is not really general, "near the end of its lifetime" is not really concrete, "involving rvalue references" is not really clear, and "Example: The result of calling a function whose return type is an rvalue reference is an xvalue." sounds like a snake is biting its tail.

PRIMARY VALUE CATEGORIES

Every expression belongs to exactly one primary value category. These value categories are lvalue, xvalue and prvalue categories.

lvalues

The expression E belongs to the lvalue category if and only if E refers to an entity that ALREADY has had an identity (address, name or alias) that makes it accessible outside of E.

#include <iostream>

int i=7;

const int& f(){
    return i;
}

int main()
{
    std::cout<<&"www"<<std::endl; // The expression "www" in this row is an lvalue expression, because string literals are arrays and every array has an address.  

    i; // The expression i in this row is an lvalue expression, because it refers to the same entity ...
    i; // ... as the entity the expression i in this row refers to.

    int* p_i=new int(7);
    *p_i; // The expression *p_i in this row is an lvalue expression, because it refers to the same entity ...
    *p_i; // ... as the entity the expression *p_i in this row refers to.

    const int& r_I=7;
    r_I; // The expression r_I in this row is an lvalue expression, because it refers to the same entity ...
    r_I; // ... as the entity the expression r_I in this row refers to.

    f(); // The expression f() in this row is an lvalue expression, because it refers to the same entity ...
    i; // ... as the entity the expression f() in this row refers to.

    return 0;
}

xvalues

The expression E belongs to the xvalue category if and only if it is

— the result of calling a function, whether implicitly or explicitly, whose return type is an rvalue reference to the type of object being returned, or

int&& f(){
    return 3;
}

int main()
{
    f(); // The expression f() belongs to the xvalue category, because f() return type is an rvalue reference to object type.

    return 0;
}

— a cast to an rvalue reference to object type, or

int main()
{
    static_cast<int&&>(7); // The expression static_cast<int&&>(7) belongs to the xvalue category, because it is a cast to an rvalue reference to object type.
    std::move(7); // std::move(7) is equivalent to static_cast<int&&>(7).

    return 0;
}

— a class member access expression designating a non-static data member of non-reference type in which the object expression is an xvalue, or

struct As
{
    int i;
};

As&& f(){
    return As();
}

int main()
{
    f().i; // The expression f().i belongs to the xvalue category, because As::i is a non-static data member of non-reference type, and the subexpression f() belongs to the xvlaue category.

    return 0;
}

— a pointer-to-member expression in which the first operand is an xvalue and the second operand is a pointer to data member.

Note that the effect of the rules above is that named rvalue references to objects are treated as lvalues and unnamed rvalue references to objects are treated as xvalues; rvalue references to functions are treated as lvalues whether named or not.

#include <functional>

struct As
{
    int i;
};

As&& f(){
    return As();
}

int main()
{
    f(); // The expression f() belongs to the xvalue category, because it refers to an unnamed rvalue reference to object.
    As&& rr_a=As();
    rr_a; // The expression rr_a belongs to the lvalue category, because it refers to a named rvalue reference to object.
    std::ref(f); // The expression std::ref(f) belongs to the lvalue category, because it refers to an rvalue reference to function.

    return 0;
}

prvalues

The expression E belongs to the prvalue category if and only if E belongs neither to the lvalue nor to the xvalue category.

struct As
{
    void f(){
        this; // The expression this is a prvalue expression. Note, that the expression this is not a variable.
    }
};

As f(){
    return As();
}

int main()
{
    f(); // The expression f() belongs to the prvalue category, because it belongs neither to the lvalue nor to the xvalue category.

    return 0;
}

MIXED VALUE CATEGORIES

There are two further important mixed value categories. These value categories are rvalue and glvalue categories.

rvalues

The expression E belongs to the rvalue category if and only if E belongs to the xvalue category, or to the prvalue category.

Note that this definition means that the expression E belongs to the rvalue category if and only if E refers to an entity that has not had any identity that makes it accessible outside of E YET.

glvalues

The expression E belongs to the glvalue category if and only if E belongs to the lvalue category, or to the xvalue category.

A PRACTICAL RULE

Scott Meyer has published a very useful rule of thumb to distinguish rvalues from lvalues.

  • If you can take the address of an expression, the expression is an lvalue.
  • If the type of an expression is an lvalue reference (e.g., T& or const T&, etc.), that expression is an lvalue.
  • Otherwise, the expression is an rvalue. Conceptually (and typically also in fact), rvalues correspond to temporary objects, such as those returned from functions or created through implicit type conversions. Most literal values (e.g., 10 and 5.3) are also rvalues.

How to do something to each file in a directory with a batch script

I had some malware that marked all files in a directory as hidden/system/readonly. If anyone else finds themselves in this situation, cd into the directory and run for /f "delims=|" %f in ('forfiles') do attrib -s -h -r %f.

How to create roles in ASP.NET Core and assign them to users?

My comment was deleted because I provided a link to a similar question I answered here. Ergo, I'll answer it more descriptively this time. Here goes.

You could do this easily by creating a CreateRoles method in your startup class. This helps check if the roles are created, and creates the roles if they aren't; on application startup. Like so.

private async Task CreateRoles(IServiceProvider serviceProvider)
    {
        //initializing custom roles 
        var RoleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
        var UserManager = serviceProvider.GetRequiredService<UserManager<ApplicationUser>>();
        string[] roleNames = { "Admin", "Manager", "Member" };
        IdentityResult roleResult;

        foreach (var roleName in roleNames)
        {
            var roleExist = await RoleManager.RoleExistsAsync(roleName);
            if (!roleExist)
            {
                //create the roles and seed them to the database: Question 1
                roleResult = await RoleManager.CreateAsync(new IdentityRole(roleName));
            }
        }

        //Here you could create a super user who will maintain the web app
        var poweruser = new ApplicationUser
        {

            UserName = Configuration["AppSettings:UserName"],
            Email = Configuration["AppSettings:UserEmail"],
        };
    //Ensure you have these values in your appsettings.json file
        string userPWD = Configuration["AppSettings:UserPassword"];
        var _user = await UserManager.FindByEmailAsync(Configuration["AppSettings:AdminUserEmail"]);

       if(_user == null)
       {
            var createPowerUser = await UserManager.CreateAsync(poweruser, userPWD);
            if (createPowerUser.Succeeded)
            {
                //here we tie the new user to the role
                await UserManager.AddToRoleAsync(poweruser, "Admin");

            }
       }
    }

and then you could call the CreateRoles(serviceProvider).Wait(); method from the Configure method in the Startup class. ensure you have IServiceProvider as a parameter in the Configure class.

Using role-based authorization in a controller to filter user access: Question 2

You can do this easily, like so.

[Authorize(Roles="Manager")]
public class ManageController : Controller
{
   //....
}

You can also use role-based authorization in the action method like so. Assign multiple roles, if you will

[Authorize(Roles="Admin, Manager")]
public IActionResult Index()
{
/*
 .....
 */ 
}

While this works fine, for a much better practice, you might want to read about using policy based role checks. You can find it on the ASP.NET core documentation here, or this article I wrote about it here

Git says local branch is behind remote branch, but it's not

You probably did some history rewriting? Your local branch diverged from the one on the server. Run this command to get a better understanding of what happened:

gitk HEAD @{u}

I would strongly recommend you try to understand where this error is coming from. To fix it, simply run:

git push -f

The -f makes this a “forced push” and overwrites the branch on the server. That is very dangerous when you are working in team. But since you are on your own and sure that your local state is correct this should be fine. You risk losing commit history if that is not the case.

How to validate an OAuth 2.0 access token for a resource server?

Google way

Google Oauth2 Token Validation

Request:

https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=1/fFBGRNJru1FQd44AzqT3Zg

Respond:

{
  "audience":"8819981768.apps.googleusercontent.com",
  "user_id":"123456789",
  "scope":"https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email",
  "expires_in":436
} 

Microsoft way

Microsoft - Oauth2 check an authorization

Github way

Github - Oauth2 check an authorization

Request:

GET /applications/:client_id/tokens/:access_token

Respond:

{
  "id": 1,
  "url": "https://api.github.com/authorizations/1",
  "scopes": [
    "public_repo"
  ],
  "token": "abc123",
  "app": {
    "url": "http://my-github-app.com",
    "name": "my github app",
    "client_id": "abcde12345fghij67890"
  },
  "note": "optional note",
  "note_url": "http://optional/note/url",
  "updated_at": "2011-09-06T20:39:23Z",
  "created_at": "2011-09-06T17:26:27Z",
  "user": {
    "login": "octocat",
    "id": 1,
    "avatar_url": "https://github.com/images/error/octocat_happy.gif",
    "gravatar_id": "somehexcode",
    "url": "https://api.github.com/users/octocat"
  }
}

Amazon way

Login With Amazon - Developer Guide (Dec. 2015, page 21)

Request :

https://api.amazon.com/auth/O2/tokeninfo?access_token=Atza|IQEBLjAsAhRmHjNgHpi0U-Dme37rR6CuUpSR...

Response :

HTTP/l.l 200 OK
Date: Fri, 3l May 20l3 23:22:l0 GMT 
x-amzn-RequestId: eb5be423-ca48-lle2-84ad-5775f45l4b09 
Content-Type: application/json 
Content-Length: 247 

{ 
  "iss":"https://www.amazon.com", 
  "user_id": "amznl.account.K2LI23KL2LK2", 
  "aud": "amznl.oa2-client.ASFWDFBRN", 
  "app_id": "amznl.application.436457DFHDH", 
  "exp": 3597, 
  "iat": l3ll280970
}

Playing mp3 song on python

You are trying to play a .mp3 as if it were a .wav.

You could try using pydub to convert it to .wav format, and then feed that into pyAudio.

Example:

from pydub import AudioSegment

song = AudioSegment.from_mp3("original.mp3")
song.export("final.wav", format="wav")

Alternatively, use pygame, as mentioned in the other answer.

How to remove &quot; from my Json in javascript?

The following works for me:

function decodeHtml(html) {
    let areaElement = document.createElement("textarea");
    areaElement.innerHTML = html;

    return areaElement.value;
}

Django datetime issues (default=datetime.now())

datetime.now() is being evaluated once, when your class is instantiated. Try removing the parenthesis so that the function datetime.now is returned and THEN evaluated. I had the same issue with setting default values for my DateTimeFields and wrote up my solution here.

jQuery .scrollTop(); + animation

for this you can use callback method

body.animate({
      scrollTop:0
    }, 500, 
    function(){} // callback method use this space how you like
);

Nesting optgroups in a dropdownlist/select

I needed clean and lightweight solution (so no jQuery and alike), which will look exactly like plain HTML, would also continue working when only plain HTML is preset (so javascript will only enhance it), and which will allow searching by starting letters (including national UTF-8 letters) if possible where it does not add extra weight. It also must work fast on very slow browsers (think rPi - so preferably no javascript executing after page load).

In firefox it uses CSS identing and thus allow searching by letters, and in other browsers it will use &nbsp; prepending (but there it does not support quick search by letters). Anyway, I'm quite happy with results.

You can try it in action here

It goes like this:

CSS:

.i0 { }
.i1 { margin-left: 1em; }
.i2 { margin-left: 2em; }
.i3 { margin-left: 3em; }
.i4 { margin-left: 4em; }
.i5 { margin-left: 5em; }

HTML (class "i1", "i2" etc denote identation level):

<form action="/filter/" method="get">
<select name="gdje" id="gdje">
<option value=1 class="i0">Svugdje</option>
<option value=177 class="i1">Bosna i Hercegovina</option>
<option value=190 class="i2">Babin Do</option>  
<option value=258 class="i2">Banja Luka</option>
<option value=181 class="i2">Tuzla</option>
<option value=307 class="i1">Crna Gora</option>
<option value=308 class="i2">Podgorica</option>
<option value=2 SELECTED class="i1">Hrvatska</option>
<option value=5 class="i2">Bjelovarsko-bilogorska županija</option>
<option value=147 class="i3">Bjelovar</option>
<option value=79 class="i3">Daruvar</option>  
<option value=94 class="i3">Garešnica</option>
<option value=329 class="i3">Grubišno Polje</option>
<option value=368 class="i3">Cazma</option>
<option value=6 class="i2">Brodsko-posavska županija</option>
<option value=342 class="i3">Gornji Bogicevci</option>
<option value=158 class="i3">Klakar</option>
<option value=140 class="i3">Nova Gradiška</option>
</select>
</form>

<script>
<!--
        window.onload = loadFilter;
// -->   
</script>

JavaScript:

function loadFilter() {
  'use strict';
  // indents all options depending on "i" CSS class
  function add_nbsp() {
    var opt = document.getElementsByTagName("option");
    for (var i = 0; i < opt.length; i++) {
      if (opt[i].className[0] === 'i') {
      opt[i].innerHTML = Array(3*opt[i].className[1]+1).join("&nbsp;") + opt[i].innerHTML;      // this means "&nbsp;" x (3*$indent)
      }
    }
  }
  // detects browser
  navigator.sayswho= (function() {
    var ua= navigator.userAgent, tem,
    M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*([\d\.]+)/i) || [];
    if(/trident/i.test(M[1])){
        tem=  /\brv[ :]+(\d+(\.\d+)?)/g.exec(ua) || [];
        return 'IE '+(tem[1] || '');
    }
    M= M[2]? [M[1], M[2]]:[navigator.appName, navigator.appVersion, '-?'];
    if((tem= ua.match(/version\/([\.\d]+)/i))!= null) M[2]= tem[1];
    return M.join(' ');
  })();
  // quick detection if browser is firefox
  function isFirefox() {
    var ua= navigator.userAgent,
    M= ua.match(/firefox\//i);  
    return M;
  }
  // indented select options support for non-firefox browsers
  if (!isFirefox()) {
    add_nbsp();
  }
}  

multi line comment vb.net in Visual studio 2010

Create a new toolbar and add the commands

  • Edit.SelectionComment
  • Edit.SelectionUncomment

Select your custom tookbar to show it.

You will then see the icons as mention by moriartyn

Inserting a PDF file in LaTeX

For putting a whole pdf in your file and not just 1 page, use:

\usepackage{pdfpages}

\includepdf[pages=-]{myfile.pdf}

Parameter "stratify" from method "train_test_split" (scikit Learn)

In this context, stratification means that the train_test_split method returns training and test subsets that have the same proportions of class labels as the input dataset.

How to add an image to an svg container using D3.js

nodeEnter.append("svg:image")
.attr('x', -9)
.attr('y', -12)
.attr('width', 20)
.attr('height', 24)
.attr("xlink:href", "resources/images/check.png")

How do I detect what .NET Framework versions and service packs are installed?

The registry is the official way to detect if a specific version of the Framework is installed.

enter image description here

Which registry keys are needed change depending on the Framework version you are looking for:

Framework Version  Registry Key
------------------------------------------------------------------------------------------
1.0                HKLM\Software\Microsoft\.NETFramework\Policy\v1.0\3705 
1.1                HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\Install 
2.0                HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Install 
3.0                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.0\Setup\InstallSuccess 
3.5                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.5\Install 
4.0 Client Profile HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Client\Install
4.0 Full Profile   HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Full\Install

Generally you are looking for:

"Install"=dword:00000001

except for .NET 1.0, where the value is a string (REG_SZ) rather than a number (REG_DWORD).

Determining the service pack level follows a similar pattern:

Framework Version  Registry Key
------------------------------------------------------------------------------------------
1.0                HKLM\Software\Microsoft\Active Setup\Installed Components\{78705f0d-e8db-4b2d-8193-982bdda15ecd}\Version 
1.0[1]             HKLM\Software\Microsoft\Active Setup\Installed Components\{FDC11A6F-17D1-48f9-9EA3-9051954BAA24}\Version 
1.1                HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\SP 
2.0                HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\SP 
3.0                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.0\SP 
3.5                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.5\SP 
4.0 Client Profile HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Client\Servicing
4.0 Full Profile   HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Full\Servicing

[1] Windows Media Center or Windows XP Tablet Edition

As you can see, determining the SP level for .NET 1.0 changes if you are running on Windows Media Center or Windows XP Tablet Edition. Again, .NET 1.0 uses a string value while all of the others use a DWORD.

For .NET 1.0 the string value at either of these keys has a format of #,#,####,#. The last # is the Service Pack level.

While I didn't explicitly ask for this, if you want to know the exact version number of the Framework you would use these registry keys:

Framework Version  Registry Key
------------------------------------------------------------------------------------------
1.0                HKLM\Software\Microsoft\Active Setup\Installed Components\{78705f0d-e8db-4b2d-8193-982bdda15ecd}\Version 
1.0[1]             HKLM\Software\Microsoft\Active Setup\Installed Components\{FDC11A6F-17D1-48f9-9EA3-9051954BAA24}\Version 
1.1                HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322 
2.0[2]             HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Version 
2.0[3]             HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Increment
3.0                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.0\Version 
3.5                HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.5\Version 
4.0 Client Profile HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Version 
4.0 Full Profile   HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Version 

[1] Windows Media Center or Windows XP Tablet Edition
[2] .NET 2.0 SP1
[3] .NET 2.0 Original Release (RTM)

Again, .NET 1.0 uses a string value while all of the others use a DWORD.

Additional Notes

  • for .NET 1.0 the string value at either of these keys has a format of #,#,####,#. The #,#,#### portion of the string is the Framework version.

  • for .NET 1.1, we use the name of the registry key itself, which represents the version number.

  • Finally, if you look at dependencies, .NET 3.0 adds additional functionality to .NET 2.0 so both .NET 2.0 and .NET 3.0 must both evaulate as being installed to correctly say that .NET 3.0 is installed. Likewise, .NET 3.5 adds additional functionality to .NET 2.0 and .NET 3.0, so .NET 2.0, .NET 3.0, and .NET 3. should all evaluate to being installed to correctly say that .NET 3.5 is installed.

  • .NET 4.0 installs a new version of the CLR (CLR version 4.0) which can run side-by-side with CLR 2.0.

Update for .NET 4.5

There won't be a v4.5 key in the registry if .NET 4.5 is installed. Instead you have to check if the HKLM\Software\Microsoft\NET Framework Setup\NDP\v4\Full key contains a value called Release. If this value is present, .NET 4.5 is installed, otherwise it is not. More details can be found here and here.

Why is width: 100% not working on div {display: table-cell}?

How about this? (jsFiddle link)

CSS

ul {
    background: #CCC;
    height: 1000%;
    width: 100%;
    list-style-position: outside;
    margin: 0; padding: 0;
    position: absolute;
}
li {
 background-color: #EBEBEB;
    border-bottom: 1px solid #CCCCCC;
    border-right: 1px solid #CCCCCC;
    display: table;
    height: 180px;
    overflow: hidden;
    width: 200px;
}
.divone{
    display: table-cell;
    margin: 0 auto;
    text-align: center;
    vertical-align: middle;
    width: 100%; 

}
img {
    width: 100%;
    height: 410px;
}
.wrapper {
  position: absolute;
}

Get JSF managed bean by name in any Servlet related class

You can get the managed bean by passing the name:

public static Object getBean(String beanName){
    Object bean = null;
    FacesContext fc = FacesContext.getCurrentInstance();
    if(fc!=null){
         ELContext elContext = fc.getELContext();
         bean = elContext.getELResolver().getValue(elContext, null, beanName);
    }

    return bean;
}

How to use custom packages

For a project hosted on GitHub, here's what people usually do:

github.com/
  laike9m/
    myproject/
      mylib/
        mylib.go
        ...
      main.go

mylib.go

package mylib

...

main.go

import "github.com/laike9m/myproject/mylib"

...

Windows Bat file optional argument parsing

If you want to use optional arguments, but not named arguments, then this approach worked for me. I think this is much easier code to follow.

REM Get argument values.  If not specified, use default values.
IF "%1"=="" ( SET "DatabaseServer=localhost" ) ELSE ( SET "DatabaseServer=%1" )
IF "%2"=="" ( SET "DatabaseName=MyDatabase" ) ELSE ( SET "DatabaseName=%2" )

REM Do work
ECHO Database Server = %DatabaseServer%
ECHO Database Name   = %DatabaseName%

What is C# equivalent of <map> in C++?

Take a look at the Dictionary class in System::Collections::Generic.

Dictionary<myComplex, int> myMap = new Dictionary<myComplex, int>();

How to use <DllImport> in VB.NET?

You can also try this

Private Declare Function GetWindowText Lib "user32.dll" (ByVal hwnd As IntPtr, ByVal lpString As StringBuilder, ByVal cch As Integer) As Integer

I always use Declare Function instead of DllImport... Its more simply, its shorter and does the same

"string could not resolved" error in Eclipse for C++ (Eclipse can't resolve standard library)

Set ${COMMAND} to g++ on Linux

Under "Preprocessor Include Paths, Macros, etc." and "CDT GCC Built-in Compiler Settings" there is an undefined ${COMMAND} variable if you imported the sources from an existing Makefile project.

Eclipse tries to run that command to parse its stdout to find headers, but ${COMMAND} is not set by default, and so it is not able to do so.

I have explained this in more detail at: How to solve "Unresolved inclusion: <iostream>" in a C++ file in Eclipse CDT?

Docker CE on RHEL - Requires: container-selinux >= 2.9

Docker CE is not supported on RHEL. Any way you are trying to get around that is not a supported way. You can see the supported platforms in the Docker Documentation. I suggest you either use a supported OS, or switch to Enterprise Edition.

How to Lock Android App's Orientation to Portrait in Phones and Landscape in Tablets?

android:screenOrientation="locked"

in <application> for all app in <activity> for actual activity

How to prevent a file from direct URL Access?

For me this was the only thing that worked and it worked great:

RewriteCond %{HTTP_HOST}@@%{HTTP_REFERER} !^([^@])@@https?://\1/.
RewriteRule .(gif|jpg|jpeg|png|tif|pdf|wav|wmv|wma|avi|mov|mp4|m4v|mp3|zip?)$ - [F]

found it at: https://simplefilelist.com/how-can-i-prevent-direct-url-access-to-my-files-from-outside-my-website/

How do I execute a Shell built-in command with a C function?

If you just want to execute the shell command in your c program, you could use,

   #include <stdlib.h>

   int system(const char *command);

In your case,

system("pwd");

The issue is that there isn't an executable file called "pwd" and I'm unable to execute "echo $PWD", since echo is also a built-in command with no executable to be found.

What do you mean by this? You should be able to find the mentioned packages in /bin/

sudo find / -executable -name pwd
sudo find / -executable -name echo

using facebook sdk in Android studio

I have used facebook sdk 4.10.0 to integrate login in my android app. Tutorial I followed is :

facebook login android studio

You will be able to get first name, last name, email, gender , facebook id and birth date from facebbok.

Above tutorial also explains how to create app in facebook developer console through video.

add below in build.gradle(Module:app) file:

repositories {
        mavenCentral()
    }

and

 compile 'com.facebook.android:facebook-android-sdk:4.10.0'

now add below in AndroidManifest.xml file :

 <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="your app id from facebook developer console"/>

     <activity android:name="com.facebook.FacebookActivity"
               android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
               android:theme="@android:style/Theme.Translucent.NoTitleBar"
               android:label="@string/app_name" />

add following in activity_main.xml file :

<LinearLayout 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"
    android:orientation="vertical"
    tools:context="com.demonuts.fblogin.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#000"
        android:layout_marginLeft="10dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:id="@+id/text"/>

    <com.facebook.login.widget.LoginButton
        android:id="@+id/btnfb"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

And in last add below in MainActivity.java file :

import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.widget.TextView;

import com.facebook.AccessToken;
import com.facebook.AccessTokenTracker;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.Profile;
import com.facebook.ProfileTracker;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;

import org.json.JSONException;
import org.json.JSONObject;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;


public class MainActivity extends AppCompatActivity {

    private TextView tvdetails;
    private CallbackManager callbackManager;
    private AccessTokenTracker accessTokenTracker;
    private ProfileTracker profileTracker;
    private LoginButton loginButton;
    private FacebookCallback<LoginResult> callback = new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            GraphRequest request = GraphRequest.newMeRequest(
                    loginResult.getAccessToken(),
                    new GraphRequest.GraphJSONObjectCallback() {
                        @Override
                        public void onCompleted(JSONObject object, GraphResponse response) {
                            Log.v("LoginActivity", response.toString());

                            // Application code
                            try {
                                Log.d("tttttt",object.getString("id"));
                                String birthday="";
                                if(object.has("birthday")){
                                    birthday = object.getString("birthday"); // 01/31/1980 format
                                }

                                String fnm = object.getString("first_name");
                                String lnm = object.getString("last_name");
                                String mail = object.getString("email");
                                String gender = object.getString("gender");
                                String fid = object.getString("id");
                                tvdetails.setText(fnm+" "+lnm+" \n"+mail+" \n"+gender+" \n"+fid+" \n"+birthday);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }
                    });
            Bundle parameters = new Bundle();
            parameters.putString("fields", "id, first_name, last_name, email, gender, birthday, location");
            request.setParameters(parameters);
            request.executeAsync();

        }

        @Override
        public void onCancel() {

        }

        @Override
        public void onError(FacebookException error) {

        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        FacebookSdk.sdkInitialize(this);
        setContentView(R.layout.activity_main);

        tvdetails = (TextView) findViewById(R.id.text);

        loginButton = (LoginButton) findViewById(R.id.btnfb);

        callbackManager = CallbackManager.Factory.create();

        accessTokenTracker= new AccessTokenTracker() {
            @Override
            protected void onCurrentAccessTokenChanged(AccessToken oldToken, AccessToken newToken) {

            }
        };

        profileTracker = new ProfileTracker() {
            @Override
            protected void onCurrentProfileChanged(Profile oldProfile, Profile newProfile) {

            }
        };

        accessTokenTracker.startTracking();
        profileTracker.startTracking();
        loginButton.setReadPermissions(Arrays.asList("public_profile", "email", "user_birthday", "user_friends"));
        loginButton.registerCallback(callbackManager, callback);

    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode, resultCode, data);

    }

    @Override
    public void onStop() {
        super.onStop();
        accessTokenTracker.stopTracking();
        profileTracker.stopTracking();
    }

    @Override
    public void onResume() {
        super.onResume();
        Profile profile = Profile.getCurrentProfile();

    }

}

In Python, how do I create a string of n characters in one line of code?

Why "one line"? You can fit anything onto one line.

Assuming you want them to start with 'a', and increment by one character each time (with wrapping > 26), here's a line:

>>> mkstring = lambda(x): "".join(map(chr, (ord('a')+(y%26) for y in range(x))))
>>> mkstring(10)
'abcdefghij'
>>> mkstring(30)
'abcdefghijklmnopqrstuvwxyzabcd'

What tool can decompile a DLL into C++ source code?

There really isn't any way of doing this as most of the useful information is discarded in the compilation process. However, you may want to take a look at this site to see if you can find some way of extracting something from the DLL.

Visual Studio Code always asking for git credentials

You should be able to set your credentials like this:

git remote set-url origin https://<USERNAME>:<PASSWORD>@bitbucket.org/path/to/repo.git

You can get the remote url like this:

git config --get remote.origin.url

Printing the correct number of decimal points with cout

You have to set the 'float mode' to fixed.

float num = 15.839;

// this will output 15.84
std::cout << std::fixed << "num = " << std::setprecision(2) << num << std::endl;

How to remove part of a string before a ":" in javascript?

There is no need for jQuery here, regular JavaScript will do:

var str = "Abc: Lorem ipsum sit amet";
str = str.substring(str.indexOf(":") + 1);

Or, the .split() and .pop() version:

var str = "Abc: Lorem ipsum sit amet";
str = str.split(":").pop();

Or, the regex version (several variants of this):

var str = "Abc: Lorem ipsum sit amet";
str = /:(.+)/.exec(str)[1];

sqlplus error on select from external table: ORA-29913: error in executing ODCIEXTTABLEOPEN callout

When you want to create an external_table, all field's name must be written in UPPERCASE.

Done.

AngularJS Directive Restrict A vs E

According to the documentation:

When should I use an attribute versus an element? Use an element when you are creating a component that is in control of the template. The common case for this is when you are creating a Domain-Specific Language for parts of your template. Use an attribute when you are decorating an existing element with new functionality.

Edit following comment on pitfalls for a complete answer:

Assuming you're building an app that should run on Internet Explorer <= 8, whom support has been dropped by AngularJS team from AngularJS 1.3, you have to follow the following instructions in order to make it working: https://docs.angularjs.org/guide/ie

How to have image and text side by side

Your h4 has some crazy margin on it, so remove it

h4 {
    margin:0px;
}

http://jsfiddle.net/qMdfC/2/

edit:

http://jsfiddle.net/qMdfC/6/

for the 0 minutes text, added a float left to the first div, but personally i'd just combine them, although you may have reasons not to.

What is a tracking branch?

TL;DR Remember, all git branches are themselves used for tracking the history of a set of files. Therefore, isn't every branch actually a "tracking branch", because that's what these branches are used for: to track the history of files over time. Thus we should probably be calling normal git "branches", "tracking-branches", but we don't. Instead we shorten their name to just "branches".

So that's partly why the term "tracking-branches" is so terribly confusing: to the uninitiated it can easily mean 2 different things.

In git the term "Tracking-branch" is a short name for the more complete term: "Remote-tracking-branch".

It's probably better at first if you substitute the more formal terms until you get more comfortable with these concepts.

Let's rephrase your question to this:

What is a "Remote-tracking-branch?"

The key word here is 'Remote', so skip down to where you get confused and I'll describe what a Remote Tracking branch is and how it's used.


To better understand git terminology, including branches and tracking, which can initially be very confusing, I think it's easiest if you first get crystal clear on what git is and the basic structure of how it works. Without a solid understand like this I promise you'll get lost in the many details, as git has lots of complexity; (translation: lots of people use it for very important things).

The following is an introduction/overview, but you might find this excellent article also informative.


WHAT GIT IS, AND WHAT IT'S FOR

A git repository is like a family photo album: It holds historical snapshots showing how things were in past times. A "snapshot" being a recording of something, at a given moment in time.

A git repository is not limited to holding human family photos. It, rather can be used to record and organize anything that is evolving or changing over time.

The basic idea is to create a book so we can easily look backwards in time,

  • to compare past times, with now, or other moments in time, and
  • to re-create the past.

When you get mired down in the complexity and terminology, try to remember that a git repository is first and foremost, a repository of snapshots, and just like a photo album, it's used to both store and organize these snapshots.


SNAPSHOTS AND TRACKING

tracked - to follow a person or animal by looking for proof that they have been somewhere (dictionary.cambridge.org)

In git, "your project" refers to a directory tree of files (one or more, possibly organized into a tree structure using sub-directories), which you wish to keep a history of.

Git, via a 3 step process, records a "snapshot" of your project's directory tree at a given moment in time.

Each git snapshot of your project, is then organized by "links" pointing to previous snapshots of your project.

One by one, link-by-link, we can look backwards in time to find any previous snapshot of you, or your heritage.

For example, we can start with today's most recent snapshot of you, and then using a link, seek backwards in time, for a photo of you taken perhaps yesterday or last week, or when you were a baby, or even who your mother was, etc.

This is refereed to as "tracking; in this example it is tracking your life, or seeing where you have left a footprint, and where you have come from.


COMMITS

A commit is similar to one page in your photo album with a single snapshot, in that its not just the snapshot contained there, but also has the associated meta information about that snapshot. It includes:

  • an address or fixed place where we can find this commit, similar to its page number,
  • one snapshot of your project (of your file directory tree) at a given moment in time,
  • a caption or comment saying what the snapshot is of, or for,
  • the date and time of that snapshot,
  • who took the snapshot, and finally,
  • one, or more, links backwards in time to previous, related snapshots like to yesterday's snapshot, or to our parent or parents. In other words "links" are similar to pointers to the page numbers of other, older photos of myself, or when I am born to my immediate parents.

A commit is the most important part of a well organized photo album.


THE FAMILY TREE OVER TIME, WITH BRANCHES AND MERGES

Disambiguation: "Tree" here refers not to a file directory tree, as used above, but rather to a family tree of related parent and child commits over time.

The git family tree structure is modeled on our own, human family trees.

In what follows to help understand links in a simple way, I'll refer to:

  • a parent-commit as simply a "parent", and
  • a child-commit as simply a "child" or "children" if plural.

You should understand this instinctively, as it is based on the tree of life:

  • A parent might have one or more children pointing back in time at them, and
  • children always have one or more parents they point to.

Thus all commits except brand new commits, (you could say "juvenile commits"), have one or more children pointing back at them.

  • With no children are pointing to a parent, then this commit is only a "growing tip", or where the next child will be born from.

  • With just one child pointing at a parent, this is just a simple, single parent <-- child relationship.

Line diagram of a simple, single parent chain linking backwards in time:

(older) ... <--link1-- Commit1 <--link2-- Commit2 <--link3-- Commit3 (newest)

BRANCHES

branch - A "branch" is an active line of development. The most recent commit on a branch is referred to as the tip of that branch. The tip of the branch is referenced by a branch head, which moves forward as additional development is done on the branch. A single Git repository can track an arbitrary number of branches, but your working tree is associated with just one of them (the "current" or "checked out" branch), and HEAD points to that branch. (gitglossary)

A git branch also refers to two things:

  • a name given to a growing tip, (an identifier), and
  • the actual branch in the graph of links between commits.

More than one child pointing --at a--> parent, is what git calls "branching".

NOTE: In reality any child, of any parent, weather first, second, or third, etc., can be seen as their own little branch, with their own growing tip. So a branch is not necessarily a long thing with many nodes, rather it is a little thing, created with just one or more commits from a given parent.

The first child of a parent might be said to be part of that same branch, whereas the successive children of that parent are what are normally called "branches".

In actuality, all children (not just the first) branch from it's parent, or you could say link, but I would argue that each link is actually the core part of a branch.

Formally, a git "branch" is just a name, like 'foo' for example, given to a specific growing tip of a family hierarchy. It's one type of what they call a "ref". (Tags and remotes which I'll explain later are also refs.)

ref - A name that begins with refs/ (e.g. refs/heads/master) that points to an object name or another ref (the latter is called a symbolic ref). For convenience, a ref can sometimes be abbreviated when used as an argument to a Git command; see gitrevisions(7) for details. Refs are stored in the repository.

The ref namespace is hierarchical. Different subhierarchies are used for different purposes (e.g. the refs/heads/ hierarchy is used to represent local branches). There are a few special-purpose refs that do not begin with refs/. The most notable example is HEAD. (gitglossary)

(You should take a look at the file tree inside your .git directory. It's where the structure of git is saved.)

So for example, if your name is Tom, then commits linked together that only include snapshots of you, might be the branch we name "Tom".

So while you might think of a tree branch as all of it's wood, in git a branch is just a name given to it's growing tips, not to the whole stick of wood leading up to it.

The special growing tip and it's branch which an arborist (a guy who prunes fruit trees) would call the "central leader" is what git calls "master".

The master branch always exists.

Line diagram of: Commit1 with 2 children (or what we call a git "branch"):

                parent      children

                        +-- Commit <-- Commit <-- Commit (Branch named 'Tom')
                       /
                      v
(older) ... <-- Commit1 <-- Commit                       (Branch named 'master')    

Remember, a link only points from child to parent. There is no link pointing the other way, i.e. from old to new, that is from parent to child.

So a parent-commit has no direct way to list it's children-commits, or in other words, what was derived from it.


MERGING

Children have one or more parents.

  • With just one parent this is just a simple parent <-- child commit.

  • With more than one parent this is what git calls "merging". Each child can point back to more than one parent at the same time, just as in having both a mother AND father, not just a mother.

Line diagram of: Commit2 with 2 parents (or what we call a git "merge", i.e. Procreation from multiple parents):

                parents     child

           ... <-- Commit
                        v
                         \
(older) ... <-- Commit1 <-- Commit2  

REMOTE

This word is also used to mean 2 different things:

  • a remote repository, and
  • the local alias name for a remote repository, i.e. a name which points using a URL to a remote repository.

remote repository - A repository which is used to track the same project but resides somewhere else. To communicate with remotes, see fetch or push. (gitglossary)

(The remote repository can even be another git repository on our own computer.) Actually there are two URLS for each remote name, one for pushing (i.e. uploading commits) and one for pulling (i.e. downloading commits) from that remote git repository.

A "remote" is a name (an identifier) which has an associated URL which points to a remote git repository. (It's been described as an alias for a URL, although it's more than that.)

You can setup multiple remotes if you want to pull or push to multiple remote repositories.

Though often you have just one, and it's default name is "origin" (meaning the upstream origin from where you cloned).

origin - The default upstream repository. Most projects have at least one upstream project which they track. By default origin is used for that purpose. New upstream updates will be fetched into remote-tracking branches named origin/name-of-upstream-branch, which you can see using git branch -r. (gitglossary)

Origin represents where you cloned the repository from.
That remote repository is called the "upstream" repository, and your cloned repository is called the "downstream" repository.

upstream - In software development, upstream refers to a direction toward the original authors or maintainers of software that is distributed as source code wikipedia

upstream branch - The default branch that is merged into the branch in question (or the branch in question is rebased onto). It is configured via branch..remote and branch..merge. If the upstream branch of A is origin/B sometimes we say "A is tracking origin/B". (gitglossary)

This is because most of the water generally flows down to you.
From time to time you might push some software back up to the upstream repository, so it can then flow down to all who have cloned it.

REMOTE TRACKING BRANCH

A remote-tracking-branch is first, just a branch name, like any other branch name.

It points at a local growing tip, i.e. a recent commit in your local git repository.

But note that it effectively also points to the same commit in the remote repository that you cloned the commit from.

remote-tracking branch - A ref that is used to follow changes from another repository. It typically looks like refs/remotes/foo/bar (indicating that it tracks a branch named bar in a remote named foo), and matches the right-hand-side of a configured fetch refspec. A remote-tracking branch should not contain direct modifications or have local commits made to it. (gitglossary)

Say the remote you cloned just has 2 commits, like this: parent42 <== child-of-4, and you clone it and now your local git repository has the same exact two commits: parent4 <== child-of-4.
Your remote tracking branch named origin now points to child-of-4.

Now say that a commit is added to the remote, so it looks like this: parent42 <== child-of-4 <== new-baby. To update your local, downstream repository you'll need to fetch new-baby, and add it to your local git repository. Now your local remote-tracking-branch points to new-baby. You get the idea, the concept of a remote-tracking-branch is simply to keep track of what had previously been the tip of a remote branch that you care about.


TRACKING IN ACTION

First we begin tracking a file with git.

enter image description here

Here are the basic commands involved with file tracking:

$ mkdir mydir &&  cd mydir &&  git init             # create a new git repository

$ git branch                                        # this initially reports no branches
                                                    #  (IMHO this is a bug!)

$ git status -bs       # -b = branch; -s = short    # master branch is empty
## No commits yet on master

# ...
$ touch foo                                         # create a new file

$ vim foo                                           # modify it (OPTIONAL)


$ git add         foo; commit -m 'your description'  # start tracking foo 
$ git rm  --index foo; commit -m 'your description'  # stop  tracking foo 
$ git rm          foo; commit -m 'your description'  # stop  tracking foo & also delete foo

REMOTE TRACKING IN ACTION

$ git pull    # Essentially does:  get fetch; git merge    # to update our clone

There is much more to learn about fetch, merge, etc, but this should get you off in the right direction I hope.

SQL Server: How to check if CLR is enabled?

select *
from sys.configurations
where name = 'clr enabled'

What is in your .vimrc?

Here is my .vimrc. I use Gvim 7.2

set guioptions=em
set showtabline=2
set softtabstop=2
set shiftwidth=2
set tabstop=2

" Use spaces instead of tabs
set expandtab
set autoindent

" Colors and fonts
colorscheme inkpot
set guifont=Consolas:h11:cANSI

"TAB navigation like firefox
:nmap <C-S-tab> :tabprevious<cr>
:nmap <C-tab> :tabnext<cr>
:imap <C-S-tab> <ESC>:tabprevious<cr>i
:imap <C-tab> <ESC>:tabnext<cr>i
:nmap <C-t> :tabnew<cr>
:imap <C-t> <ESC>:tabnew<cr>i
:map <C-w> :tabclose<cr>

" No Backups and line numbers
set nobackup
set number
set nuw=6

" swp files are saved to %Temp% folder
set dir=$temp
" sets the default size of gvim on open
set lines=40 columns=90

PHP refresh window? equivalent to F5 page reload?

with php you can use two redirections. It works same as refresh in some issues.

you can use a page redirect.php and post your last url to it by GET method (for example). then in redirect.php you can change header to location you`ve sent to it by GET method.

like this: your page:

<?php
header("location:redirec.php?ref=".$your_url);
?>

redirect.php:

<?php
$ref_url=$_GET["ref"];
header("location:redirec.php?ref=".$ref_url);
?>

that worked for me good.

List all virtualenv

Use below bash command to locate all virtual env in your system. You can modify the command according to your need to get in your desired format.

locate --regex "bin/activate"$ | sed 's/bin\/activate$//'

How does Facebook disable the browser's integrated Developer Tools?

Chrome changed a lot since the times facebook could disable console...

As per March 2017 this doesn't work anymore.

Best you can do is disable some of the console functions, example:

if(!window.console) window.console = {};
var methods = ["log", "debug", "warn", "info", "dir", "dirxml", "trace", "profile"];
for(var i=0;i<methods.length;i++){
    console[methods[i]] = function(){};
}

How to get sp_executesql result into a variable?

DECLARE @tab AS TABLE (col1 VARCHAR(10), col2 varchar(10)) 
INSERT into @tab EXECUTE  sp_executesql N'
SELECT 1 AS col1, 2 AS col2
UNION ALL
SELECT 1 AS col1, 2 AS col2
UNION ALL
SELECT 1 AS col1, 2 AS col2'

SELECT * FROM @tab

How to clear the cache in NetBeans

Just install cache eraser plugin, it is compatible with nb6.9, 7.0,7.1,7.2 and 7.3: To configure the plugin you have to provide the cache dir which is in netbean's about screen. Then with Tools->erase cache, you clear the netbeans cache. That is all, good luck.

http://plugins.netbeans.org/plugin/40014/cache-eraser

Get the length of a String

Swift 4

"string".count

;)

Swift 3

extension String {
    var length: Int {
        return self.characters.count
    }
}

usage

"string".length

Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?

[[ has fewer surprises and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do

[[ -e $b ]]

to test whether a file exists. But with [, you have to quote $b, because it splits the argument and expands things like "a*" (where [[ takes it literally). That has also to do with how [ can be an external program and receives its argument just normally like every other program (although it can also be a builtin, but then it still has not this special handling).

[[ also has some other nice features, like regular expression matching with =~ along with operators like they are known in C-like languages. Here is a good page about it: What is the difference between test, [ and [[ ? and Bash Tests

Setting Action Bar title and subtitle

The title for the actionbar could be in the AndroidManifest, here:

<activity 
    . . .
          android:label="string resource" 
    . . .
</activity>

android:label A user-readable label for the activity. The label is displayed on-screen when the activity must be represented to the user. It's often displayed along with the activity icon. If this attribute is not set, the label set for the application as a whole is used instead (see the element's label attribute). The activity's label — whether set here or by the element — is also the default label for all the activity's intent filters (see the element's label attribute). The label should be set as a reference to a string resource, so that it can be localized like other strings in the user interface. However, as a convenience while you're developing the application, it can also be set as a raw string.

How to stop IIS asking authentication for default website on localhost

What worked for me is ,,,

Click Start>control panel>Administrative Tools>Internet Information Services

Expand the left tree, right-click your WebSite>Properties

Click on Directory Security, then in "Anonymous access and authentication control" click on Edit

Enable Anonymous access>browse> enter the credentials of the admin (like Administrator) (check names),> Click OK

Apply the settings and it should work fine.

MacOS Xcode CoreSimulator folder very big. Is it ok to delete content?

for Xcode 8:

What I do is run sudo du -khd 1 in the Terminal to see my file system's storage amounts for each folder in simple text, then drill up/down into where the huge GB are hiding using the cd command.

Ultimately you'll find the Users//Library/Developer/CoreSimulator/Devices folder where you can have little concern about deleting all those "devices" using iOS versions you no longer need. It's also safe to just delete them all, but keep in mind you'll lose data that's written to the device like sqlite files you may want to use as a backup version.

I once saved over 50GB doing this since I did so much testing on older iOS versions.

How can I specify the required Node.js version in package.json?

There's another, simpler way to do this:

  1. npm install Node@8 (saves Node 8 as dependency in package.json)
  2. Your app will run using Node 8 for anyone - even Yarn users!

This works because node is just a package that ships node as its package binary. It just includes as node_module/.bin which means it only makes node available to package scripts. Not main shell.

See discussion on Twitter here: https://twitter.com/housecor/status/962347301456015360

Unit test naming best practices

the name of the the test case for class Foo should be FooTestCase or something like it (FooIntegrationTestCase or FooAcceptanceTestCase) - since it is a test case. see http://xunitpatterns.com/ for some standard naming conventions like test, test case, test fixture, test method, etc.

Unable to create Genymotion Virtual Device

It works fine by running genymotion with administrative privileges.

I solved it by deleting all of file in Ova,Templates and Deployed folder, I can run download and reinstall again and run without Administrative privileges

How to implement a simple scenario the OO way

You might implement your class model by composition, having the book object have a map of chapter objects contained within it (map chapter number to chapter object). Your search function could be given a list of books into which to search by asking each book to search its chapters. The book object would then iterate over each chapter, invoking the chapter.search() function to look for the desired key and return some kind of index into the chapter. The book's search() would then return some data type which could combine a reference to the book and some way to reference the data that it found for the search. The reference to the book could be used to get the name of the book object that is associated with the collection of chapter search hits.

Can table columns with a Foreign Key be NULL?

The above works but this does not. Note the ON DELETE CASCADE

CREATE DATABASE t;
USE t;

CREATE TABLE parent (id INT NOT NULL,
                 PRIMARY KEY (id)
) ENGINE=INNODB;

CREATE TABLE child (id INT NULL, 
                parent_id INT NULL,
                FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE

) ENGINE=INNODB;


INSERT INTO child (id, parent_id) VALUES (1, NULL);
-- Query OK, 1 row affected (0.01 sec)

Resizing UITableView to fit content

Mu solution for this in swift 3: Call this method in viewDidAppear

func UITableView_Auto_Height(_ t : UITableView)
{
        var frame: CGRect = t.frame;
        frame.size.height = t.contentSize.height;
        t.frame = frame;        
}

Windows CMD command for accessing usb?

You can access the USB drive by its drive letter. To know the drive letter you can run this command:

C:\>wmic logicaldisk where drivetype=2 get deviceid, volumename, description

From here you will get the drive letter (Device ID) of your USB drive.

For example if its F: then run the following command in command prompt to see its contents:

C:\> F:

F:\> dir

How to 'insert if not exists' in MySQL?

use INSERT IGNORE INTO table

see http://bogdan.org.ua/2007/10/18/mysql-insert-if-not-exists-syntax.html

there's also INSERT … ON DUPLICATE KEY UPDATE syntax, you can find explanations on dev.mysql.com


Post from bogdan.org.ua according to Google's webcache:

18th October 2007

To start: as of the latest MySQL, syntax presented in the title is not possible. But there are several very easy ways to accomplish what is expected using existing functionality.

There are 3 possible solutions: using INSERT IGNORE, REPLACE, or INSERT … ON DUPLICATE KEY UPDATE.

Imagine we have a table:

CREATE TABLE `transcripts` (
`ensembl_transcript_id` varchar(20) NOT NULL,
`transcript_chrom_start` int(10) unsigned NOT NULL,
`transcript_chrom_end` int(10) unsigned NOT NULL,
PRIMARY KEY (`ensembl_transcript_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Now imagine that we have an automatic pipeline importing transcripts meta-data from Ensembl, and that due to various reasons the pipeline might be broken at any step of execution. Thus, we need to ensure two things:

  1. repeated executions of the pipeline will not destroy our database

  2. repeated executions will not die due to ‘duplicate primary key’ errors.

Method 1: using REPLACE

It’s very simple:

REPLACE INTO `transcripts`
SET `ensembl_transcript_id` = 'ENSORGT00000000001',
`transcript_chrom_start` = 12345,
`transcript_chrom_end` = 12678;

If the record exists, it will be overwritten; if it does not yet exist, it will be created. However, using this method isn’t efficient for our case: we do not need to overwrite existing records, it’s fine just to skip them.

Method 2: using INSERT IGNORE Also very simple:

INSERT IGNORE INTO `transcripts`
SET `ensembl_transcript_id` = 'ENSORGT00000000001',
`transcript_chrom_start` = 12345,
`transcript_chrom_end` = 12678;

Here, if the ‘ensembl_transcript_id’ is already present in the database, it will be silently skipped (ignored). (To be more precise, here’s a quote from MySQL reference manual: “If you use the IGNORE keyword, errors that occur while executing the INSERT statement are treated as warnings instead. For example, without IGNORE, a row that duplicates an existing UNIQUE index or PRIMARY KEY value in the table causes a duplicate-key error and the statement is aborted.”.) If the record doesn’t yet exist, it will be created.

This second method has several potential weaknesses, including non-abortion of the query in case any other problem occurs (see the manual). Thus it should be used if previously tested without the IGNORE keyword.

Method 3: using INSERT … ON DUPLICATE KEY UPDATE:

Third option is to use INSERT … ON DUPLICATE KEY UPDATE syntax, and in the UPDATE part just do nothing do some meaningless (empty) operation, like calculating 0+0 (Geoffray suggests doing the id=id assignment for the MySQL optimization engine to ignore this operation). Advantage of this method is that it only ignores duplicate key events, and still aborts on other errors.

As a final notice: this post was inspired by Xaprb. I’d also advise to consult his other post on writing flexible SQL queries.

The representation of if-elseif-else in EL using JSF

One possible solution is:

<h:panelGroup rendered="#{bean.row == 10}">
    <div class="text-success">
        <h:outputText value="#{bean.row}"/>
    </div>
</h:panelGroup>

Jquery UI Datepicker not displaying

I had the same problem using JQuery-UI 1.8.21, and JQuery-UI 1.8.22.

Problem was because I had two DatePicker script, one embedded with jquery-ui-1.8.22.custom.min.js and another one in jquery.ui.datepicker.js (an old version before I upgrade to 1.8.21).

Deleting the duplicate jquery.ui.datepicker.js, resolve problem for both 1.8.21 and 1.8.22.

Error inflating class fragment

Adding this to manifest solved my problem

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

How to decode a Base64 string?

Isn't encoding taking the text TO base64 and decoding taking base64 BACK to text? You seem be mixing them up here. When I decode using this online decoder I get:

BASE64: blahblah
UTF8: nVnV

not the other way around. I can't reproduce it completely in PS though. See sample below:

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("blahblah"))
nV?nV?

PS > [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("nVnV"))
blZuVg==

EDIT I believe you're using the wrong encoder for your text. The encoded base64 string is encoded from UTF8(or ASCII) string.

PS > [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

PS > [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
????

PS > [System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String("YmxhaGJsYWg="))
blahblah

Reset/remove CSS styles for element only

There are two ideas here being confused:

  1. The first idea is about "returning" styles back to a browser's UA style sheet value set (the style sheet that comes with the browser on install that defines what each element looks like). Each browser defines its own styles as to how elements should look by default. This idea is about returning all page styles back to each browsers native element styles.
  2. The second idea is about "resetting" all default browser styles to a common look and feel shared by all browsers. People build special "reset" sheets to try and align all the browser elements to a common agreed on style, universally. This has nothing to do with a browsers default UA styles and more about "cleaning up" and aligning all browsers to a common base style. This is an additive process only.

Those are two very different concepts people here are confusing.

Because each browser often had default, out-of-the-box element and layout styles that looked slightly different, people came up with the idea of the "reset" or "reboot" style sheet to align all the browsers BEFORE applying custom CSS. Bootstrap now does this, for example. But that had nothing to do with people wanting to return to the browser's default look and feel.

The problem was not the building of these custom "reset" style sheets, it is figuring out what the default CSS was for each browser and each element BEFORE any styles were applied. Most found out you cant rebuild an existing clean cascade until you "clear out" all styles already applied. But how to get back to the default browser styling?

For some this meant going beyond returning the elements to the browsers UA style sheet that comes with the browser. Many wanted to reset back to "initial" property values which has NOTHING to do with the browser's default style, but really the properties defaults. This is dangerous as in the case of "display" pushes block level elements back to "inline" and breaks table layouts and other things.

So I do NOT agree with users here using "initial" to reset anything or custom reset classes that change every property back to some arbitrary base value set.

A better solution to me has always been to attempt to try and return all core element styling back to the browser's UA style sheet values, which is what all our end-users are using anyway. If you are creating a new website, you don't have to do this. You start with the browser's default styles and add to them. Its only after you've added third-party CSS products, or found yourself with complicated CSS cascades you want to figure out how to return to the browser default style sheet values.

For this reason, I'm for creating your own "reset" sheet to reset all the elements to one common style first that's shared by all old and new browsers as a first step. You then have a solid framework that's much easier to revert to without going back to the browser defaults. You are simply building on a reset common core set of element style values. Once build your own "reset" sheet, one that ADDS not ALTERS the browsers UA styles, you have a site that's very easy to modify.

The only problem remaining then is when you have a site that does NOT have such a reset sheet, or have that complex third party CSS and need to try and return to the browser UA styles. How do you do that?

I realize Internet Explorer has forced us too manually reset every property to get back to any sort of reset. But pushing those property values all back to "initial" destroys the browser UA style sheet values completely! BAD IDEA! A better way is to simply use "all:revert" for non-IE browsers on every element using a wildcard, and "inherit" only for a handful of inherited root-level properties found in the "html" and "body" elements that affect all inheriting children in the page. (see below). I'm NOT for these huge resets of properties using "initial" or going back to some imaginary standard we assume all browsers or IE will use. For starters "initial" has poor support in IE and doesn't reset values to element defaults, only property defaults. But its also pointless if you are going to create a reset sheet to align all elements to a common style. In that case its pointless to clear out styles and start over.

So here is my simple solution that in most cases does enough to reset what text-based values sift down into IE from the root and use "all:revert" for all non-IE browsers to force non-inherited values back to the browser's UA style sheet completely, giving you a true restart. This does not interfere with higher level classes and styles layered over your element styles, which should always be the goal anyway. Its why I'm NOT for these custom reset classes which is tedious and unnecessary and doesn't return the element to its browser UA style anyway. Notice the slightly more selective selectors below which would write over, for example, Bootstrap's "reboot" style values, returning them to the browser default styles. These would not reset element styles on elements for IE, of course, but for non-IE browsers and most inheritable text styling it would return elements in most agents to the UA style sheets that come with browsers:

:root, html {
    display: block;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    -webkit-text-size-adjust: inherit;
    -webkit-tap-highlight-color: inherit;
    all: revert;
}

html body {
    display: block;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    line-height: inherit;
    margin: inherit;
    padding: inherit;
    color: inherit;
    text-align: inherit;
    background-color: inherit;
    background: inherit;
    all: revert;
}

html body * {
    /* IE elements under body would not be affected by this, but if needed you could add custom elements with property resets as needed to this sheet. */
    all: revert;
}

How to access Winform textbox control from another class?

What about

Form1.textBox1.text = "change text";

note: 1. you have to "include" Form1 to your second form source file by using Form1;

  1. textBox1 should be public

How to create a signed APK file using Cordova command line interface?

An update to @malcubierre for Cordova 4 (and later)-

Create a file called release-signing.properties and put in APPFOLDER\platforms\android folder

Contents of the file: edit after = for all except 2nd line

storeFile=C:/yourlocation/app.keystore
storeType=jks
keyAlias=aliasname
keyPassword=aliaspass
storePassword=password

Then this command should build a release version:

cordova build android --release

UPDATE - This was not working for me Cordova 10 with android 9 - The build was replacing the release-signing.properties file. I had to make a build.json file and drop it in the appfolder, same as root. And this is the contents - replace as above:

{
"android": {
    "release": {
       "keystore": "C:/yourlocation/app.keystore",
        "storePassword": "password",
        "alias": "aliasname",
        "password" : "aliaspass",
        "keystoreType": ""
    }
}
}

Run it and it will generate one of those release-signing.properties in the android folder

jquery json to string?

I use

$.param(jsonObj)

which gets me the string.

How to take column-slices of dataframe in pandas

Note: .ix has been deprecated since Pandas v0.20. You should instead use .loc or .iloc, as appropriate.

The DataFrame.ix index is what you want to be accessing. It's a little confusing (I agree that Pandas indexing is perplexing at times!), but the following seems to do what you want:

>>> df = DataFrame(np.random.rand(4,5), columns = list('abcde'))
>>> df.ix[:,'b':]
      b         c         d         e
0  0.418762  0.042369  0.869203  0.972314
1  0.991058  0.510228  0.594784  0.534366
2  0.407472  0.259811  0.396664  0.894202
3  0.726168  0.139531  0.324932  0.906575

where .ix[row slice, column slice] is what is being interpreted. More on Pandas indexing here: http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-advanced

center a row using Bootstrap 3

What you are doing is not working, because you apply the margin: auto to the full-width column.

Wrap it in a div and center that one. E.g:

<div class="i-am-centered">
  <div class="row">...</div>
</div>

.

.i-am-centered { margin: auto; max-width: 300px;}

http://www.bootply.com/93751

Its a cleaner solution anyway, as it is more expressive and as you usually don't want to mess with the grid.

Git keeps asking me for my ssh key passphrase

Once you have started the SSH agent with:

eval $(ssh-agent)

Do either:

  1. To add your private key to it:

     ssh-add
    

    This will ask you your passphrase just once, and then you should be allowed to push, provided that you uploaded the public key to Github.

  2. To add and save your key permanently on macOS:

     ssh-add -K  
    

    This will persist it after you close and re-open it by storing it in user's keychain.

  3. To add and save your key permanently on Ubuntu (or equivalent):

      ssh-add ~/.ssh/id_rsa
    

Why do we use volatile keyword?

Consider this code,

int some_int = 100;

while(some_int == 100)
{
   //your code
}

When this program gets compiled, the compiler may optimize this code, if it finds that the program never ever makes any attempt to change the value of some_int, so it may be tempted to optimize the while loop by changing it from while(some_int == 100) to something which is equivalent to while(true) so that the execution could be fast (since the condition in while loop appears to be true always). (if the compiler doesn't optimize it, then it has to fetch the value of some_int and compare it with 100, in each iteration which obviously is a little bit slow.)

However, sometimes, optimization (of some parts of your program) may be undesirable, because it may be that someone else is changing the value of some_int from outside the program which compiler is not aware of, since it can't see it; but it's how you've designed it. In that case, compiler's optimization would not produce the desired result!

So, to ensure the desired result, you need to somehow stop the compiler from optimizing the while loop. That is where the volatile keyword plays its role. All you need to do is this,

volatile int some_int = 100; //note the 'volatile' qualifier now!

In other words, I would explain this as follows:

volatile tells the compiler that,

"Hey compiler, I'm volatile and, you know, I can be changed by some XYZ that you're not even aware of. That XYZ could be anything. Maybe some alien outside this planet called program. Maybe some lightning, some form of interrupt, volcanoes, etc can mutate me. Maybe. You never know who is going to change me! So O you ignorant, stop playing an all-knowing god, and don't dare touch the code where I'm present. Okay?"

Well, that is how volatile prevents the compiler from optimizing code. Now search the web to see some sample examples.


Quoting from the C++ Standard ($7.1.5.1/8)

[..] volatile is a hint to the implementation to avoid aggressive optimization involving the object because the value of the object might be changed by means undetectable by an implementation.[...]

Related topic:

Does making a struct volatile make all its members volatile?

How to keep one variable constant with other one changing with row in excel

Placing a $ in front of the row value to keep constant worked well for me. e.g.

=b2+a$1

Querying a linked sql server

SELECT * FROM [server].[database].[schema].[table]

This works for me. SSMS intellisense may still underline this as a syntax error, but it should work if your linked server is configured and your query is otherwise correct.

git push rejected: error: failed to push some refs

git push -f if you have permission, but that will screw up anyone else who pulls from that repo, so be careful.

If that is denied, and you have access to the server, as canzar says below, you can allow this on the server with

git config receive.denyNonFastForwards false

How to force the browser to reload cached CSS and JavaScript files

Instead of changing the version manually, I would recommend you use an MD5 hash of the actual CSS file.

So your URL would be something like

http://mysite.com/css/[md5_hash_here]/style.css

You could still use the rewrite rule to strip out the hash, but the advantage is that now you can set your cache policy to "cache forever", since if the URL is the same, that means that the file is unchanged.

You can then write a simple shell script that would compute the hash of the file and update your tag (you'd probably want to move it to a separate file for inclusion).

Simply run that script every time CSS changes and you're good. The browser will ONLY reload your files when they are altered. If you make an edit and then undo it, there's no pain in figuring out which version you need to return to in order for your visitors not to re-download.

Insert a background image in CSS (Twitter Bootstrap)

Adding background image on html, body or a wrapper element to achieve background image will cause problems with padding. Check this ticket https://github.com/twitter/bootstrap/issues/3169 on github. ShaunR's comment and also one of the creators response to this. The given solution in created ticket doesn't solve the problem, but it at least gets things going if you aren't using responsive features.

Assuming that you are using container without responsive features, and have a width of 960px, and want to achieve 10px padding, you set:

.container {
   min-width: 940px;
   padding: 10px;
}

Use String.split() with multiple delimiters

If you know the sting will always be in the same format, first split the string based on . and store the string at the first index in a variable. Then split the string in the second index based on - and store indexes 0, 1 and 2. Finally, split index 2 of the previous array based on . and you should have obtained all of the relevant fields.

Refer to the following snippet:

String[] tmp = pdfName.split(".");
String val1 = tmp[0];
tmp = tmp[1].split("-");
String val2 = tmp[0];
...

Visual Studio: How to show Overloads in IntelliSense?

  • The command Edit.ParameterInfo (mapped to Ctrl+Shift+Space by default) will show the overload tooltip if it's invoked when the cursor is inside the parameter brackets of a method call.

  • The command Edit.QuickInfo (mapped to Ctrl+KCtrl+I by default) will show the tooltip that you'd see if you moused over the cursor location.

How to split a number into individual digits in c#?

Here is some code that might help you out. Strings can be treated as an array of characters

string numbers = "12345";
int[] intArray = new int[numbers.Length];
for (int i=0; i < numbers.Length; i++)
{
   intArray[i] = int.Parse(numbers[i]);
}

Pipe to/from the clipboard in Bash script

Try

xclip

xclip - command line interface to X selections (clipboard) 

man

Open URL in same window and in same tab

Open another url like a click in link

window.location.href = "http://example.com";

Check if value is in select list with JQuery

Just in case you (or someone else) could be interested in doing it without jQuery:

var exists = false;
for(var i = 0, opts = document.getElementById('select-box').options; i < opts.length; ++i)
   if( opts[i].value === 'bar' )
   {
      exists = true; 
      break;
   }

go to character in vim

vim +21490go script.py

From the command line will open the file and take you to position 21490 in the buffer.

Triggering it from the command line like this allows you to automate a script to parse the exception message and open the file to the problem position.


Excerpt from man vim:

+{command}

-c {command}

{command} will be executed after the first file has been read. {command} is interpreted as an Ex command. If the {command} contains spaces it must be enclosed in double quotes (this depends on the shell that is used).

Autonumber value of last inserted row - MS Access / VBA

Private Function addInsert(Media As String, pagesOut As Integer) As Long


    Set rst = db.OpenRecordset("tblenccomponent")
    With rst
        .AddNew
        !LeafletCode = LeafletCode
        !LeafletName = LeafletName
        !UNCPath = "somePath\" + LeafletCode + ".xml"
        !Media = Media
        !CustomerID = cboCustomerID.Column(0)
        !PagesIn = PagesIn
        !pagesOut = pagesOut
        addInsert = CLng(rst!enclosureID) 'ID is passed back to calling routine
        .Update
    End With
    rst.Close

End Function

How to check if array is empty or does not exist?

You want to do the check for undefined first. If you do it the other way round, it will generate an error if the array is undefined.

if (array === undefined || array.length == 0) {
    // array empty or does not exist
}

Update

This answer is getting a fair amount of attention, so I'd like to point out that my original answer, more than anything else, addressed the wrong order of the conditions being evaluated in the question. In this sense, it fails to address several scenarios, such as null values, other types of objects with a length property, etc. It is also not very idiomatic JavaScript.

The foolproof approach
Taking some inspiration from the comments, below is what I currently consider to be the foolproof way to check whether an array is empty or does not exist. It also takes into account that the variable might not refer to an array, but to some other type of object with a length property.

if (!Array.isArray(array) || !array.length) {
  // array does not exist, is not an array, or is empty
  // ? do not attempt to process array
}

To break it down:

  1. Array.isArray(), unsurprisingly, checks whether its argument is an array. This weeds out values like null, undefined and anything else that is not an array.
    Note that this will also eliminate array-like objects, such as the arguments object and DOM NodeList objects. Depending on your situation, this might not be the behavior you're after.

  2. The array.length condition checks whether the variable's length property evaluates to a truthy value. Because the previous condition already established that we are indeed dealing with an array, more strict comparisons like array.length != 0 or array.length !== 0 are not required here.

The pragmatic approach
In a lot of cases, the above might seem like overkill. Maybe you're using a higher order language like TypeScript that does most of the type-checking for you at compile-time, or you really don't care whether the object is actually an array, or just array-like.

In those cases, I tend to go for the following, more idiomatic JavaScript:

if (!array || !array.length) {
    // array or array.length are falsy
    // ? do not attempt to process array
}

Or, more frequently, its inverse:

if (array && array.length) {
    // array and array.length are truthy
    // ? probably OK to process array
}

With the introduction of the optional chaining operator (Elvis operator) in ECMAScript 2020, this can be shortened even further:

if (!array?.length) {
    // array or array.length are falsy
    // ? do not attempt to process array
}

Or the opposite:

if (array?.length) {
    // array and array.length are truthy
    // ? probably OK to process array
}

How to generate auto increment field in select query

DECLARE @id INT 
SET @id = 0 
UPDATE cartemp
SET @id = CarmasterID = @id + 1 
GO

Call static methods from regular ES6 class methods

Both ways are viable, but they do different things when it comes to inheritance with an overridden static method. Choose the one whose behavior you expect:

class Super {
  static whoami() {
    return "Super";
  }
  lognameA() {
    console.log(Super.whoami());
  }
  lognameB() {
    console.log(this.constructor.whoami());
  }
}
class Sub extends Super {
  static whoami() {
    return "Sub";
  }
}
new Sub().lognameA(); // Super
new Sub().lognameB(); // Sub

Referring to the static property via the class will be actually static and constantly give the same value. Using this.constructor instead will use dynamic dispatch and refer to the class of the current instance, where the static property might have the inherited value but could also be overridden.

This matches the behavior of Python, where you can choose to refer to static properties either via the class name or the instance self.

If you expect static properties not to be overridden (and always refer to the one of the current class), like in Java, use the explicit reference.

How to loop through Excel files and load them into a database using SSIS package?

I ran into an article that illustrates a method where the data from the same excel sheet can be imported in the selected table until there is no modifications in excel with data types.

If the data is inserted or overwritten with new ones, importing process will be successfully accomplished, and the data will be added to the table in SQL database.

The article may be found here: http://www.sqlshack.com/using-ssis-packages-import-ms-excel-data-database/

Hope it helps.

What is javax.inject.Named annotation supposed to be used for?

Use @Named to differentiate between different objects of the same type bound in the same scope.

@Named("maxWaitTime")
public long maxWaitTimeMs;

@Named("minWaitTime")
public long minWaitTimeMs;

Without the @Named qualifier, the injector would not know which long to bind to which variable.

  • If you want to create annotations that act like @Named, use the @Qualifier annotation when creating them.

  • If you look at @Named, it is itself annotated with @Qualifier.

XPath to fetch SQL XML value

I think the xpath query you want goes something like this:

/xml/box[@stepId="$stepId"]/components/component[@id="$componentId"]/variables/variable[@nom="Enabled" and @valeur="Yes"]

This should get you the variables that are named "Enabled" with a value of "Yes" for the specified $stepId and $componentId. This is assuming that your xml starts with an tag like you show, and not

If the SQL Server 2005 XPath stuff is pretty straightforward (I've never used it), then the above query should work. Otherwise, someone else may have to help you with that.

What is the most effective way to get the index of an iterator of an std::vector?

Beside int float string etc., you can put extra data to .second when using diff. types like:

std::map<unsigned long long int, glm::ivec2> voxels_corners;
std::map<unsigned long long int, glm::ivec2>::iterator it_corners;

or

struct voxel_map {
    int x,i;
};

std::map<unsigned long long int, voxel_map> voxels_corners;
std::map<unsigned long long int, voxel_map>::iterator it_corners;

when

long long unsigned int index_first=some_key; // llu in this case...
int i=0;
voxels_corners.insert(std::make_pair(index_first,glm::ivec2(1,i++)));

or

long long unsigned int index_first=some_key;
int index_counter=0;
voxel_map one;
one.x=1;
one.i=index_counter++;

voxels_corners.insert(std::make_pair(index_first,one));

with right type || structure you can put anything in the .second including a index number that is incremented when doing an insert.

instead of

it_corners - _corners.begin()

or

std::distance(it_corners.begin(), it_corners)

after

it_corners = voxels_corners.find(index_first+bdif_x+x_z);

the index is simply:

int vertice_index = it_corners->second.y;

when using the glm::ivec2 type

or

int vertice_index = it_corners->second.i;

in case of the structure data type

make a header full screen (width) css

Set the max-width:1250px; that is currently on your body on your #container. This way your header will be 100% of his parent (body) :)

How can I add items to an empty set in python

D = {} is a dictionary not set.

>>> d = {}
>>> type(d)
<type 'dict'>

Use D = set():

>>> d = set()
>>> type(d)
<type 'set'>
>>> d.update({1})
>>> d.add(2)
>>> d.update([3,3,3])
>>> d
set([1, 2, 3])

Get underlined text with Markdown

Another reason is that <u> tags are deprecated in XHTML and HTML5, so it would need to produce something like <span style="text-decoration:underline">this</span>. (IMHO, if <u> is deprecated, so should be <b> and <i>.) Note that Markdown produces <strong> and <em> instead of <b> and <i>, respectively, which explains the purpose of the text therein instead of its formatting. Formatting should be handled by stylesheets.

Update: The <u> element is no longer deprecated in HTML5.

Can ordered list produce result that looks like 1.1, 1.2, 1.3 (instead of just 1, 2, 3, ...) with css?

Note: Use CSS counters to create nested numbering in a modern browser. See the accepted answer. The following is for historical interest only.


If the browser supports content and counter,

_x000D_
_x000D_
.foo {_x000D_
  counter-reset: foo;_x000D_
}_x000D_
.foo li {_x000D_
  list-style-type: none;_x000D_
}_x000D_
.foo li::before {_x000D_
  counter-increment: foo;_x000D_
  content: "1." counter(foo) " ";_x000D_
}
_x000D_
<ol class="foo">_x000D_
  <li>uno</li>_x000D_
  <li>dos</li>_x000D_
  <li>tres</li>_x000D_
  <li>cuatro</li>_x000D_
</ol>
_x000D_
_x000D_
_x000D_

Clearing all cookies with JavaScript

Here's a simple code to delete all cookies in JavaScript.

function deleteAllCookies(){
   var cookies = document.cookie.split(";");
   for (var i = 0; i < cookies.length; i++)
     deleteCookie(cookies[i].split("=")[0]);
}

function setCookie(name, value, expirydays) {
 var d = new Date();
 d.setTime(d.getTime() + (expirydays*24*60*60*1000));
 var expires = "expires="+ d.toUTCString();
 document.cookie = name + "=" + value + "; " + expires;
}

function deleteCookie(name){
  setCookie(name,"",-1);
}

Run the function deleteAllCookies() to clear all cookies.

Bootstrap-select - how to fire event on change

When Bootstrap Select initializes, it'll build a set of custom divs that run alongside the original <select> element and will typically synchronize state between the two input mechanisms.

BS Select Elements

Which is to say that one way to handle events on bootstrap select is to listen for events on the original select that it modifies, regardless of who updated it.

Solution 1 - Native Events

Just listen for a change event and get the selected value using javascript or jQuery like this:

$('select').on('change', function(e){
  console.log(this.value,
              this.options[this.selectedIndex].value,
              $(this).find("option:selected").val(),);
});

*NOTE: As with any script reliant on the DOM, make sure you wait for the DOM ready event before executing

Demo in Stack Snippets:

_x000D_
_x000D_
$(function() {_x000D_
_x000D_
  $('select').on('change', function(e){_x000D_
    console.log(this.value,_x000D_
                this.options[this.selectedIndex].value,_x000D_
                $(this).find("option:selected").val(),);_x000D_
  });_x000D_
  _x000D_
});
_x000D_
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>_x000D_
<link href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/css/bootstrap-select.css" rel="stylesheet"/>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/js/bootstrap-select.js"></script>_x000D_
_x000D_
<select class="selectpicker">_x000D_
  <option val="Must"> Mustard </option>_x000D_
  <option val="Cat" > Ketchup </option>_x000D_
  <option val="Rel" > Relish  </option>_x000D_
</select>
_x000D_
_x000D_
_x000D_

Solution 2 - Bootstrap Select Custom Events

As this answer alludes, Bootstrap Select has their own set of custom events, including changed.bs.select which:

fires after the select's value has been changed. It passes through event, clickedIndex, newValue, oldValue.

And you can use that like this:

$("select").on("changed.bs.select", 
      function(e, clickedIndex, newValue, oldValue) {
    console.log(this.value, clickedIndex, newValue, oldValue)
});

Demo in Stack Snippets:

_x000D_
_x000D_
$(function() {_x000D_
_x000D_
  $("select").on("changed.bs.select", _x000D_
        function(e, clickedIndex, newValue, oldValue) {_x000D_
      console.log(this.value, clickedIndex, newValue, oldValue)_x000D_
  });_x000D_
_x000D_
});
_x000D_
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>_x000D_
<link href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/css/bootstrap-select.css" rel="stylesheet"/>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.js"></script>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/js/bootstrap.js"></script>_x000D_
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/js/bootstrap-select.js"></script>_x000D_
_x000D_
<select class="selectpicker">_x000D_
  <option val="Must"> Mustard </option>_x000D_
  <option val="Cat" > Ketchup </option>_x000D_
  <option val="Rel" > Relish  </option>_x000D_
</select>
_x000D_
_x000D_
_x000D_

Rails params explained?

As others have pointed out, params values can come from the query string of a GET request, or the form data of a POST request, but there's also a third place they can come from: The path of the URL.

As you might know, Rails uses something called routes to direct requests to their corresponding controller actions. These routes may contain segments that are extracted from the URL and put into params. For example, if you have a route like this:

match 'products/:id', ...

Then a request to a URL like http://example.com/products/42 will set params[:id] to 42.

What is the HTML unicode character for a "tall" right chevron?

Use '›'

&rsaquo; -> single right angle quote. For single left angle quote, use &lsaquo;

Difference between Iterator and Listiterator?

the following is that the difference between iterator and listIterator

iterator :

boolean hasNext();
E next();
void remove();

listIterator:

boolean hasNext();
E next();
boolean hasPrevious();
E previous();
int nextIndex();
int previousIndex();
void remove();
void set(E e);
void add(E e);

How to automatically close cmd window after batch file execution?

This works for me

cd "C:\Program Files\SmartBear\SoapUI-5.6.0\bin"

start SoapUI-5.6.0.exe -w "C:\DATA\SoapUi\Workspaces\Production-workspace.xml"

exit

Choosing a file in Python with simple Dialog

How about using tkinter?

from Tkinter import Tk     # from tkinter import Tk for Python 3.x
from tkinter.filedialog import askopenfilename

Tk().withdraw() # we don't want a full GUI, so keep the root window from appearing
filename = askopenfilename() # show an "Open" dialog box and return the path to the selected file
print(filename)

Done!

SQL Server: how to select records with specific date from datetime column

The easiest way is to convert to a date:

SELECT *
FROM dbo.LogRequests
WHERE cast(dateX as date) = '2014-05-09';

Often, such expressions preclude the use of an index. However, according to various sources on the web, the above is sargable (meaning it will use an index), such as this and this.

I would be inclined to use the following, just out of habit:

SELECT *
FROM dbo.LogRequests
WHERE dateX >= '2014-05-09' and dateX < '2014-05-10';

How to capture a list of specific type with mockito

The nested generics-problem can be avoided with the @Captor annotation:

public class Test{

    @Mock
    private Service service;

    @Captor
    private ArgumentCaptor<ArrayList<SomeType>> captor;

    @Before
    public void init(){
        MockitoAnnotations.initMocks(this);
    }

    @Test 
    public void shouldDoStuffWithListValues() {
        //...
        verify(service).doStuff(captor.capture()));
    }
}

Entity Framework vs LINQ to SQL

Here's some metrics guys... (QUANTIFYING THINGS!!!!)

I took this query where I was using Entity Framework

var result = (from metattachType in _dbContext.METATTACH_TYPE
                join lineItemMetattachType in _dbContext.LINE_ITEM_METATTACH_TYPE on metattachType.ID equals lineItemMetattachType.METATTACH_TYPE_ID
                where (lineItemMetattachType.LINE_ITEM_ID == lineItemId && lineItemMetattachType.IS_DELETED == false
                && metattachType.IS_DELETED == false)
                select new MetattachTypeDto()
                {
                    Id = metattachType.ID,
                    Name = metattachType.NAME
                }).ToList();

and changed it into this where I'm using the repository pattern Linq

            return await _attachmentTypeRepository.GetAll().Where(x => !x.IsDeleted)
                .Join(_lineItemAttachmentTypeRepository.GetAll().Where(x => x.LineItemId == lineItemId && !x.IsDeleted),
                attachmentType => attachmentType.Id,
                lineItemAttachmentType => lineItemAttachmentType.MetattachTypeId,
                (attachmentType, lineItemAttachmentType) => new AttachmentTypeDto
                {
                    Id = attachmentType.Id,
                    Name = attachmentType.Name
                }).ToListAsync().ConfigureAwait(false);

Linq-to-sql

            return (from attachmentType in _attachmentTypeRepository.GetAll()
                    join lineItemAttachmentType in _lineItemAttachmentTypeRepository.GetAll() on attachmentType.Id equals lineItemAttachmentType.MetattachTypeId
                    where (lineItemAttachmentType.LineItemId == lineItemId && !lineItemAttachmentType.IsDeleted && !attachmentType.IsDeleted)
                    select new AttachmentTypeDto()
                    {
                        Id = attachmentType.Id,
                        Name = attachmentType.Name
                    }).ToList();

Also, please know that Linq-to-Sql is 14x faster than Linq...

enter image description here

Read/Write String from/to a File in Android

I'm a bit of a beginner and struggled getting this to work today.

Below is the class that I ended up with. It works but I was wondering how imperfect my solution is. Anyway, I was hoping some of you more experienced folk might be willing to have a look at my IO class and give me some tips. Cheers!

public class HighScore {
    File data = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator);
    File file = new File(data, "highscore.txt");
    private int highScore = 0;

    public int readHighScore() {
        try {
            BufferedReader br = new BufferedReader(new FileReader(file));
            try {
                highScore = Integer.parseInt(br.readLine());
                br.close();
            } catch (NumberFormatException | IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            try {
                file.createNewFile();
            } catch (IOException ioe) {
                ioe.printStackTrace();
            }
            e.printStackTrace();
        }
        return highScore;
    }

    public void writeHighScore(int highestScore) {
        try {
            BufferedWriter bw = new BufferedWriter(new FileWriter(file));
            bw.write(String.valueOf(highestScore));
            bw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Correct way to handle conditional styling in React

Another way, using inline style and the spread operator

style={{
  ...completed ? { textDecoration: completed } : {}
}}

That way be useful in some situations where you want to add a bunch of properties at the same time base on the condition.

How to find the index of an element in an int array?

In the main method using for loops: -the third for loop in my example is the answer to this question. -in my example I made an array of 20 random integers, assigned a variable the smallest number, and stopped the loop when the location of the array reached the smallest value while counting the number of loops.

import java.util.Random;
public class scratch {
    public static void main(String[] args){
        Random rnd = new Random();
        int randomIntegers[] = new int[20];
        double smallest = randomIntegers[0];
        int location = 0;

        for(int i = 0; i < randomIntegers.length; i++){             // fills array with random integers
            randomIntegers[i] = rnd.nextInt(99) + 1;
            System.out.println(" --" + i + "-- " + randomIntegers[i]);
        }

        for (int i = 0; i < randomIntegers.length; i++){            // get the location of smallest number in the array 
            if(randomIntegers[i] < smallest){
                smallest = randomIntegers[i];                 
            }
        }

        for (int i = 0; i < randomIntegers.length; i++){                
            if(randomIntegers[i] == smallest){                      //break the loop when array location value == <smallest>
                break;
            }
            location ++;
        }
        System.out.println("location: " + location + "\nsmallest: " + smallest);
    }
}

Code outputs all the numbers and their locations, and the location of the smallest number followed by the smallest number.

Android Material and appcompat Manifest merger failed

change your build.gradle dependencies into

 implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'

or

 implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'

How do I install a custom font on an HTML site

Try this

_x000D_
_x000D_
@font-face {  _x000D_
    src: url(fonts/Market_vilis.ttf) format("truetype");_x000D_
}_x000D_
div.FontMarket { _x000D_
    font-family:  Market Deco;_x000D_
}
_x000D_
 <div class="FontMarket">KhonKaen Market</div>
_x000D_
_x000D_
_x000D_

vilis.org

Explode string by one or more spaces or tabs

In order to account for full width space such as

full width

you can extend Bens answer to this:

$searchValues = preg_split("@[\s+ ]@u", $searchString);

Sources:

(I don't have enough reputation to post a comment, so I'm wrote this as an answer.)

How do I filter an array with TypeScript in Angular 2?

To filter an array irrespective of the property type (i.e. for all property types), we can create a custom filter pipe

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: "filter" })
export class ManualFilterPipe implements PipeTransform {
  transform(itemList: any, searchKeyword: string) {
    if (!itemList)
      return [];
    if (!searchKeyword)
      return itemList;
    let filteredList = [];
    if (itemList.length > 0) {
      searchKeyword = searchKeyword.toLowerCase();
      itemList.forEach(item => {
        //Object.values(item) => gives the list of all the property values of the 'item' object
        let propValueList = Object.values(item);
        for(let i=0;i<propValueList.length;i++)
        {
          if (propValueList[i]) {
            if (propValueList[i].toString().toLowerCase().indexOf(searchKeyword) > -1)
            {
              filteredList.push(item);
              break;
            }
          }
        }
      });
    }
    return filteredList;
  }
}

//Usage

//<tr *ngFor="let company of companyList | filter: searchKeyword"></tr>

Don't forget to import the pipe in the app module

We might need to customize the logic to filer with dates.

Removing all empty elements from a hash / YAML?

I believe it would be best to use a self recursive method. That way it goes as deep as is needed. This will delete the key value pair if the value is nil or an empty Hash.

class Hash
  def compact
    delete_if {|k,v| v.is_a?(Hash) ? v.compact.empty? : v.nil? }
  end
end

Then using it will look like this:

x = {:a=>{:b=>2, :c=>3}, :d=>nil, :e=>{:f=>nil}, :g=>{}}
# => {:a=>{:b=>2, :c=>3}, :d=>nil, :e=>{:f=>nil}, :g=>{}} 
x.compact
# => {:a=>{:b=>2, :c=>3}}

To keep empty hashes you can simplify this to.

class Hash
  def compact
    delete_if {|k,v| v.compact if v.is_a?(Hash); v.nil? }
  end
end

How to delete a specific file from folder using asp.net

In my project i am using ajax and i create a web method in my code behind like this

in front

 $("#attachedfiles a").live("click", function () {
            var row = $(this).closest("tr");
            var fileName = $("td", row).eq(0).html();
            $.ajax({
                type: "POST",
                url: "SendEmail.aspx/RemoveFile",
                data: '{fileName: "' + fileName + '" }',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function () { },
                failure: function (response) {
                    alert(response.d);
                }
            });
            row.remove();
        });  

in code behind

        [WebMethod]
        public static void RemoveFile(string fileName)
        {
            List<HttpPostedFile> files = (List<HttpPostedFile>)HttpContext.Current.Session["Files"];
            files.RemoveAll(f => f.FileName.ToLower().EndsWith(fileName.ToLower()));

            if (System.IO.File.Exists(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName)))
            {
                System.IO.File.Delete(HttpContext.Current.Server.MapPath("~/Employee/uploads/" + fileName));
            }
        }

i think this will help you.

How to make a HTML list appear horizontally instead of vertically using CSS only?

quite simple:

ul.yourlist li { float:left; }

or

ul.yourlist li { display:inline; }

How to test if a string contains one of the substrings in a list, in pandas?

One option is just to use the regex | character to try to match each of the substrings in the words in your Series s (still using str.contains).

You can construct the regex by joining the words in searchfor with |:

>>> searchfor = ['og', 'at']
>>> s[s.str.contains('|'.join(searchfor))]
0    cat
1    hat
2    dog
3    fog
dtype: object

As @AndyHayden noted in the comments below, take care if your substrings have special characters such as $ and ^ which you want to match literally. These characters have specific meanings in the context of regular expressions and will affect the matching.

You can make your list of substrings safer by escaping non-alphanumeric characters with re.escape:

>>> import re
>>> matches = ['$money', 'x^y']
>>> safe_matches = [re.escape(m) for m in matches]
>>> safe_matches
['\\$money', 'x\\^y']

The strings with in this new list will match each character literally when used with str.contains.

List directory tree structure in python?

Maybe faster than @ellockie ( Maybe )

import os
def file_writer(text):
    with open("folder_structure.txt","a") as f_output:
        f_output.write(text)
def list_files(startpath):


    for root, dirs, files in os.walk(startpath):
        level = root.replace(startpath, '').count(os.sep)
        indent = '\t' * 1 * (level)
        output_string = '{}{}/ \n'.format(indent, os.path.basename(root))
        file_writer(output_string)
        subindent = '\t' * 1 * (level + 1)
        output_string = '%s %s \n' %(subindent,[f for f in files])
        file_writer(''.join(output_string))


list_files("/")

Test results in screenshot below:

enter image description here

How to copy and paste code without rich text formatting?

I have Far.exe as the first item in the start menu.

Richtext in the clipboard ->

ctrl-escape,arrdown,enter,shift-f4,$,enter
shift-insert,ctrl-insert,alt-backspace,
f10,enter

-> plaintext in the clipboard

Pros: no mouse, just blind typing, ends exactly where i was before

Cons: ANSI encoding - international symbols are lost

Luckily, I do not have to do that too often :)

Sorting HTML table with JavaScript

I wrote up some code that will sort a table by a row, assuming only one <tbody> and cells don't have a colspan.

function sortTable(table, col, reverse) {
    var tb = table.tBodies[0], // use `<tbody>` to ignore `<thead>` and `<tfoot>` rows
        tr = Array.prototype.slice.call(tb.rows, 0), // put rows into array
        i;
    reverse = -((+reverse) || -1);
    tr = tr.sort(function (a, b) { // sort rows
        return reverse // `-1 *` if want opposite order
            * (a.cells[col].textContent.trim() // using `.textContent.trim()` for test
                .localeCompare(b.cells[col].textContent.trim())
               );
    });
    for(i = 0; i < tr.length; ++i) tb.appendChild(tr[i]); // append each row in order
}
// sortTable(tableNode, columId, false);

If you don't want to make the assumptions above, you'd need to consider how you want to behave in each circumstance. (e.g. put everything into one <tbody> or add up all the preceeding colspan values, etc.)

You could then attach this to each of your tables, e.g. assuming titles are in <thead>

function makeSortable(table) {
    var th = table.tHead, i;
    th && (th = th.rows[0]) && (th = th.cells);
    if (th) i = th.length;
    else return; // if no `<thead>` then do nothing
    while (--i >= 0) (function (i) {
        var dir = 1;
        th[i].addEventListener('click', function () {sortTable(table, i, (dir = 1 - dir))});
    }(i));
}

function makeAllSortable(parent) {
    parent = parent || document.body;
    var t = parent.getElementsByTagName('table'), i = t.length;
    while (--i >= 0) makeSortable(t[i]);
}

and then invoking makeAllSortable onload.


Example fiddle of it working on a table.

How do I sort a vector of pairs based on the second element of the pair?

EDIT: using c++14, the best solution is very easy to write thanks to lambdas that can now have parameters of type auto. This is my current favorite solution

std::sort(v.begin(), v.end(), [](auto &left, auto &right) {
    return left.second < right.second;
});

Just use a custom comparator (it's an optional 3rd argument to std::sort)

struct sort_pred {
    bool operator()(const std::pair<int,int> &left, const std::pair<int,int> &right) {
        return left.second < right.second;
    }
};

std::sort(v.begin(), v.end(), sort_pred());

If you're using a C++11 compiler, you can write the same using lambdas:

std::sort(v.begin(), v.end(), [](const std::pair<int,int> &left, const std::pair<int,int> &right) {
    return left.second < right.second;
});

EDIT: in response to your edits to your question, here's some thoughts ... if you really wanna be creative and be able to reuse this concept a lot, just make a template:

template <class T1, class T2, class Pred = std::less<T2> >
struct sort_pair_second {
    bool operator()(const std::pair<T1,T2>&left, const std::pair<T1,T2>&right) {
        Pred p;
        return p(left.second, right.second);
    }
};

then you can do this too:

std::sort(v.begin(), v.end(), sort_pair_second<int, int>());

or even

std::sort(v.begin(), v.end(), sort_pair_second<int, int, std::greater<int> >());

Though to be honest, this is all a bit overkill, just write the 3 line function and be done with it :-P

"Debug certificate expired" error in Eclipse Android plugins

Delete your debug certificate under ~/.android/debug.keystore on Linux and Mac OS X; the directory is something like %USERPROFILE%/.androidon Windows.

The Eclipse plugin should then generate a new certificate when you next try to build a debug package. You may need to clean and then build to generate the certificate.

Absolute and Flexbox in React Native

This solution worked for me:

tabBarOptions: {
      showIcon: true,
      showLabel: false,
      style: {
        backgroundColor: '#000',
        borderTopLeftRadius: 40,
        borderTopRightRadius: 40,
        position: 'relative',
        zIndex: 2,
        marginTop: -48
      }
  }

How can I see which Git branches are tracking which remote / upstream branch?

I use this alias

git config --global alias.track '!f() { ([ $# -eq 2 ] && ( echo "Setting tracking for branch " $1 " -> " $2;git branch --set-upstream $1 $2; ) || ( git for-each-ref --format="local: %(refname:short) <--sync--> remote: %(upstream:short)" refs/heads && echo --Remotes && git remote -v)); }; f'

then

git track

How to exclude records with certain values in sql select

One way:

SELECT DISTINCT sc.StoreId
FROM StoreClients sc
WHERE NOT EXISTS(
    SELECT * FROM StoreClients sc2 
    WHERE sc2.StoreId = sc.StoreId AND sc2.ClientId = 5)

Why am I getting an error "Object literal may only specify known properties"?

As of TypeScript 1.6, properties in object literals that do not have a corresponding property in the type they're being assigned to are flagged as errors.

Usually this error means you have a bug (typically a typo) in your code, or in the definition file. The right fix in this case would be to fix the typo. In the question, the property callbackOnLoactionHash is incorrect and should have been callbackOnLocationHash (note the mis-spelling of "Location").

This change also required some updates in definition files, so you should get the latest version of the .d.ts for any libraries you're using.

Example:

interface TextOptions {
    alignment?: string;
    color?: string;
    padding?: number;
}
function drawText(opts: TextOptions) { ... }
drawText({ align: 'center' }); // Error, no property 'align' in 'TextOptions'

But I meant to do that

There are a few cases where you may have intended to have extra properties in your object. Depending on what you're doing, there are several appropriate fixes

Type-checking only some properties

Sometimes you want to make sure a few things are present and of the correct type, but intend to have extra properties for whatever reason. Type assertions (<T>v or v as T) do not check for extra properties, so you can use them in place of a type annotation:

interface Options {
    x?: string;
    y?: number;
}

// Error, no property 'z' in 'Options'
let q1: Options = { x: 'foo', y: 32, z: 100 };
// OK
let q2 = { x: 'foo', y: 32, z: 100 } as Options;
// Still an error (good):
let q3 = { x: 100, y: 32, z: 100 } as Options;

These properties and maybe more

Some APIs take an object and dynamically iterate over its keys, but have 'special' keys that need to be of a certain type. Adding a string indexer to the type will disable extra property checking

Before

interface Model {
  name: string;
}
function createModel(x: Model) { ... }

// Error
createModel({name: 'hello', length: 100});

After

interface Model {
  name: string;
  [others: string]: any;
}
function createModel(x: Model) { ... }

// OK
createModel({name: 'hello', length: 100});

This is a dog or a cat or a horse, not sure yet

interface Animal { move; }
interface Dog extends Animal { woof; }
interface Cat extends Animal { meow; }
interface Horse extends Animal { neigh; }

let x: Animal;
if(...) {
  x = { move: 'doggy paddle', woof: 'bark' };
} else if(...) {
  x = { move: 'catwalk', meow: 'mrar' };
} else {
  x = { move: 'gallop', neigh: 'wilbur' };
}

Two good solutions come to mind here

Specify a closed set for x

// Removes all errors
let x: Dog|Cat|Horse;

or Type assert each thing

// For each initialization
  x = { move: 'doggy paddle', woof: 'bark' } as Dog;

This type is sometimes open and sometimes not

A clean solution to the "data model" problem using intersection types:

interface DataModelOptions {
  name?: string;
  id?: number;
}
interface UserProperties {
  [key: string]: any;
}
function createDataModel(model: DataModelOptions & UserProperties) {
 /* ... */
}
// findDataModel can only look up by name or id
function findDataModel(model: DataModelOptions) {
 /* ... */
}
// OK
createDataModel({name: 'my model', favoriteAnimal: 'cat' });
// Error, 'ID' is not correct (should be 'id')
findDataModel({ ID: 32 });

See also https://github.com/Microsoft/TypeScript/issues/3755

Cross Browser Flash Detection in Javascript

If you just wanted to check whether flash is enabled, this should be enough.

function testFlash() {

    var support = false;

    //IE only
    if("ActiveXObject" in window) {

        try{
            support = !!(new ActiveXObject("ShockwaveFlash.ShockwaveFlash"));
        }catch(e){
            support = false;
        }

    //W3C, better support in legacy browser
    } else {

        support = !!navigator.mimeTypes['application/x-shockwave-flash'];

    }

    return support;

}

Note: avoid checking enabledPlugin, some mobile browser has tap-to-enable flash plugin, and will trigger false negative.

How to open spss data files in excel?

I help develop the Colectica for Excel addin, which opens SPSS and Stata data files in Excel. This does not require ODBC configuration; it reads the file and then inserts the data and metadata into your worksheet.

The addin is downloadable from http://www.colectica.com/software/colecticaforexcel

Best ways to teach a beginner to program?

I think Python is a really great Language to start with: :-)

I suggest you to try http://www.pythonchallenge.com/

It is build like a small Adventure and every Solutions links you to a new nice Problem.

After soluting the Problem you get access to a nice Forum to talk about your Code and get to see what other people created.

Password hash function for Excel VBA

Here is the MD5 code inserted in an Excel Module with the name "module_md5":

    Private Const BITS_TO_A_BYTE = 8
    Private Const BYTES_TO_A_WORD = 4
    Private Const BITS_TO_A_WORD = 32

    Private m_lOnBits(30)
    Private m_l2Power(30)

    Sub SetUpArrays()
        m_lOnBits(0) = CLng(1)
        m_lOnBits(1) = CLng(3)
        m_lOnBits(2) = CLng(7)
        m_lOnBits(3) = CLng(15)
        m_lOnBits(4) = CLng(31)
        m_lOnBits(5) = CLng(63)
        m_lOnBits(6) = CLng(127)
        m_lOnBits(7) = CLng(255)
        m_lOnBits(8) = CLng(511)
        m_lOnBits(9) = CLng(1023)
        m_lOnBits(10) = CLng(2047)
        m_lOnBits(11) = CLng(4095)
        m_lOnBits(12) = CLng(8191)
        m_lOnBits(13) = CLng(16383)
        m_lOnBits(14) = CLng(32767)
        m_lOnBits(15) = CLng(65535)
        m_lOnBits(16) = CLng(131071)
        m_lOnBits(17) = CLng(262143)
        m_lOnBits(18) = CLng(524287)
        m_lOnBits(19) = CLng(1048575)
        m_lOnBits(20) = CLng(2097151)
        m_lOnBits(21) = CLng(4194303)
        m_lOnBits(22) = CLng(8388607)
        m_lOnBits(23) = CLng(16777215)
        m_lOnBits(24) = CLng(33554431)
        m_lOnBits(25) = CLng(67108863)
        m_lOnBits(26) = CLng(134217727)
        m_lOnBits(27) = CLng(268435455)
        m_lOnBits(28) = CLng(536870911)
        m_lOnBits(29) = CLng(1073741823)
        m_lOnBits(30) = CLng(2147483647)

        m_l2Power(0) = CLng(1)
        m_l2Power(1) = CLng(2)
        m_l2Power(2) = CLng(4)
        m_l2Power(3) = CLng(8)
        m_l2Power(4) = CLng(16)
        m_l2Power(5) = CLng(32)
        m_l2Power(6) = CLng(64)
        m_l2Power(7) = CLng(128)
        m_l2Power(8) = CLng(256)
        m_l2Power(9) = CLng(512)
        m_l2Power(10) = CLng(1024)
        m_l2Power(11) = CLng(2048)
        m_l2Power(12) = CLng(4096)
        m_l2Power(13) = CLng(8192)
        m_l2Power(14) = CLng(16384)
        m_l2Power(15) = CLng(32768)
        m_l2Power(16) = CLng(65536)
        m_l2Power(17) = CLng(131072)
        m_l2Power(18) = CLng(262144)
        m_l2Power(19) = CLng(524288)
        m_l2Power(20) = CLng(1048576)
        m_l2Power(21) = CLng(2097152)
        m_l2Power(22) = CLng(4194304)
        m_l2Power(23) = CLng(8388608)
        m_l2Power(24) = CLng(16777216)
        m_l2Power(25) = CLng(33554432)
        m_l2Power(26) = CLng(67108864)
        m_l2Power(27) = CLng(134217728)
        m_l2Power(28) = CLng(268435456)
        m_l2Power(29) = CLng(536870912)
        m_l2Power(30) = CLng(1073741824)
    End Sub

    Private Function LShift(lValue, iShiftBits)
        If iShiftBits = 0 Then
            LShift = lValue
            Exit Function
        ElseIf iShiftBits = 31 Then
            If lValue And 1 Then
                LShift = &H80000000
            Else
                LShift = 0
            End If
            Exit Function
        ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
            Err.Raise 6
        End If

        If (lValue And m_l2Power(31 - iShiftBits)) Then
            LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
        Else
            LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
        End If
    End Function

    Private Function RShift(lValue, iShiftBits)
        If iShiftBits = 0 Then
            RShift = lValue
            Exit Function
        ElseIf iShiftBits = 31 Then
            If lValue And &H80000000 Then
                RShift = 1
            Else
                RShift = 0
            End If
            Exit Function
        ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
            Err.Raise 6
        End If

        RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)

        If (lValue And &H80000000) Then
            RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
        End If
    End Function

    Private Function RotateLeft(lValue, iShiftBits)
        RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
    End Function

    Private Function AddUnsigned(lX, lY)
        Dim lX4
        Dim lY4
        Dim lX8
        Dim lY8
        Dim lResult

        lX8 = lX And &H80000000
        lY8 = lY And &H80000000
        lX4 = lX And &H40000000
        lY4 = lY And &H40000000

        lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)

        If lX4 And lY4 Then
            lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
        ElseIf lX4 Or lY4 Then
            If lResult And &H40000000 Then
                lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
            Else
                lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
            End If
        Else
            lResult = lResult Xor lX8 Xor lY8
        End If

        AddUnsigned = lResult
    End Function

    Private Function F(x, y, z)
        F = (x And y) Or ((Not x) And z)
    End Function

    Private Function G(x, y, z)
        G = (x And z) Or (y And (Not z))
    End Function

    Private Function H(x, y, z)
        H = (x Xor y Xor z)
    End Function

    Private Function I(x, y, z)
        I = (y Xor (x Or (Not z)))
    End Function

    Private Sub FF(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub

    Private Sub GG(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub

    Private Sub HH(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub

    Private Sub II(a, b, c, d, x, s, ac)
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac))
        a = RotateLeft(a, s)
        a = AddUnsigned(a, b)
    End Sub

    Private Function ConvertToWordArray(sMessage)
        Dim lMessageLength
        Dim lNumberOfWords
        Dim lWordArray()
        Dim lBytePosition
        Dim lByteCount
        Dim lWordCount

        Const MODULUS_BITS = 512
        Const CONGRUENT_BITS = 448

        lMessageLength = Len(sMessage)

        lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
        ReDim lWordArray(lNumberOfWords - 1)

        lBytePosition = 0
        lByteCount = 0
        Do Until lByteCount >= lMessageLength
            lWordCount = lByteCount \ BYTES_TO_A_WORD
            lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
            lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
            lByteCount = lByteCount + 1
        Loop

        lWordCount = lByteCount \ BYTES_TO_A_WORD
        lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE

        lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)

        lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
        lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)

        ConvertToWordArray = lWordArray
    End Function

    Private Function WordToHex(lValue)
        Dim lByte
        Dim lCount

        For lCount = 0 To 3
            lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
            WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
        Next
    End Function

    Public Function MD5(sMessage)

        module_md5.SetUpArrays

        Dim x
        Dim k
        Dim AA
        Dim BB
        Dim CC
        Dim DD
        Dim a
        Dim b
        Dim c
        Dim d

        Const S11 = 7
        Const S12 = 12
        Const S13 = 17
        Const S14 = 22
        Const S21 = 5
        Const S22 = 9
        Const S23 = 14
        Const S24 = 20
        Const S31 = 4
        Const S32 = 11
        Const S33 = 16
        Const S34 = 23
        Const S41 = 6
        Const S42 = 10
        Const S43 = 15
        Const S44 = 21

        x = ConvertToWordArray(sMessage)

        a = &H67452301
        b = &HEFCDAB89
        c = &H98BADCFE
        d = &H10325476

        For k = 0 To UBound(x) Step 16
            AA = a
            BB = b
            CC = c
            DD = d

            FF a, b, c, d, x(k + 0), S11, &HD76AA478
            FF d, a, b, c, x(k + 1), S12, &HE8C7B756
            FF c, d, a, b, x(k + 2), S13, &H242070DB
            FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
            FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
            FF d, a, b, c, x(k + 5), S12, &H4787C62A
            FF c, d, a, b, x(k + 6), S13, &HA8304613
            FF b, c, d, a, x(k + 7), S14, &HFD469501
            FF a, b, c, d, x(k + 8), S11, &H698098D8
            FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
            FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
            FF b, c, d, a, x(k + 11), S14, &H895CD7BE
            FF a, b, c, d, x(k + 12), S11, &H6B901122
            FF d, a, b, c, x(k + 13), S12, &HFD987193
            FF c, d, a, b, x(k + 14), S13, &HA679438E
            FF b, c, d, a, x(k + 15), S14, &H49B40821

            GG a, b, c, d, x(k + 1), S21, &HF61E2562
            GG d, a, b, c, x(k + 6), S22, &HC040B340
            GG c, d, a, b, x(k + 11), S23, &H265E5A51
            GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
            GG a, b, c, d, x(k + 5), S21, &HD62F105D
            GG d, a, b, c, x(k + 10), S22, &H2441453
            GG c, d, a, b, x(k + 15), S23, &HD8A1E681
            GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
            GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
            GG d, a, b, c, x(k + 14), S22, &HC33707D6
            GG c, d, a, b, x(k + 3), S23, &HF4D50D87
            GG b, c, d, a, x(k + 8), S24, &H455A14ED
            GG a, b, c, d, x(k + 13), S21, &HA9E3E905
            GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
            GG c, d, a, b, x(k + 7), S23, &H676F02D9
            GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A

            HH a, b, c, d, x(k + 5), S31, &HFFFA3942
            HH d, a, b, c, x(k + 8), S32, &H8771F681
            HH c, d, a, b, x(k + 11), S33, &H6D9D6122
            HH b, c, d, a, x(k + 14), S34, &HFDE5380C
            HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
            HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
            HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
            HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
            HH a, b, c, d, x(k + 13), S31, &H289B7EC6
            HH d, a, b, c, x(k + 0), S32, &HEAA127FA
            HH c, d, a, b, x(k + 3), S33, &HD4EF3085
            HH b, c, d, a, x(k + 6), S34, &H4881D05
            HH a, b, c, d, x(k + 9), S31, &HD9D4D039
            HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
            HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
            HH b, c, d, a, x(k + 2), S34, &HC4AC5665

            II a, b, c, d, x(k + 0), S41, &HF4292244
            II d, a, b, c, x(k + 7), S42, &H432AFF97
            II c, d, a, b, x(k + 14), S43, &HAB9423A7
            II b, c, d, a, x(k + 5), S44, &HFC93A039
            II a, b, c, d, x(k + 12), S41, &H655B59C3
            II d, a, b, c, x(k + 3), S42, &H8F0CCC92
            II c, d, a, b, x(k + 10), S43, &HFFEFF47D
            II b, c, d, a, x(k + 1), S44, &H85845DD1
            II a, b, c, d, x(k + 8), S41, &H6FA87E4F
            II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
            II c, d, a, b, x(k + 6), S43, &HA3014314
            II b, c, d, a, x(k + 13), S44, &H4E0811A1
            II a, b, c, d, x(k + 4), S41, &HF7537E82
            II d, a, b, c, x(k + 11), S42, &HBD3AF235
            II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
            II b, c, d, a, x(k + 9), S44, &HEB86D391

            a = AddUnsigned(a, AA)
            b = AddUnsigned(b, BB)
            c = AddUnsigned(c, CC)
            d = AddUnsigned(d, DD)
        Next

        MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
    End Function

Figuring out whether a number is a Double in Java

Try this:

if (items.elementAt(1) instanceof Double) {
   sum.add( i, items.elementAt(1));
}

How do I change the color of radio buttons?

It may be helpful to bind radio-button to styled label. Futher details in this answer.

Oracle JDBC intermittent Connection Issue

-Djava.security.egd=file:/dev/./urandom should be right! not -Djava.security.egd=file:/dev/../dev/urandom or -Djava.security.egd=file:///dev/urandom

How to initialize var?

A var cannot be set to null since it needs to be statically typed.

var foo = null;
// compiler goes: "Huh, what's that type of foo?"

However, you can use this construct to work around the issue:

var foo = (string)null;
// compiler goes: "Ah, it's a string. Nice."

I don't know for sure, but from what I heard you can also use dynamic instead of var. This does not require static typing.

dynamic foo = null;
foo = "hi";

Also, since it was not clear to me from the question if you meant the varkeyword or variables in general: Only references (to classes) and nullable types can be set to null. For instance, you can do this:

string s = null; // reference
SomeClass c = null; // reference
int? i = null; // nullable

But you cannot do this:

int i = null; // integers cannot contain null

Create a zip file and download it

but the file i am getting from server after download it gives the size of 226 bytes

This is the size of a ZIP header. Apparently there is no data in the downloaded ZIP file. So, can you verify that the files to be added into the ZIP file are, indeed, there (relative to the path of the download PHP script)?

Consider adding a check on addFile too:

foreach($file_names as $file)
{
    $inputFile = $file_path . $file;
    if (!file_exists($inputFile))
        trigger_error("The input file $inputFile does not exist", E_USER_ERROR);
    if (!is_readable($inputFile))
        trigger_error("The input file $inputFile exists, but has wrong permissions or ownership", E_USER_ERROR);
    if (!$zip->addFile($inputFile, $file))
        trigger_error("Could not add $inputFile to ZIP file", E_USER_ERROR);
}

The observed behaviour is consistent with some problem (path error, permission problems, ...) preventing the files from being added to the ZIP file. On receiving an "empty" ZIP file, the client issues an error referring to the ZIP central directory missing (the actual error being that there is no directory, and no files).

CakePHP find method with JOIN

There are two main ways that you can do this. One of them is the standard CakePHP way, and the other is using a custom join.

It's worth pointing out that this advice is for CakePHP 2.x, not 3.x.

The CakePHP Way

You would create a relationship with your User model and Messages Model, and use the containable behavior:

class User extends AppModel {
    public $actsAs = array('Containable');
    public $hasMany = array('Message');
}

class Message extends AppModel {
    public $actsAs = array('Containable');
    public $belongsTo = array('User');
}

You need to change the messages.from column to be messages.user_id so that cake can automagically associate the records for you.

Then you can do this from the messages controller:

$this->Message->find('all', array(
    'contain' => array('User')
    'conditions' => array(
        'Message.to' => 4
    ),
    'order' => 'Message.datetime DESC'
));

The (other) CakePHP way

I recommend using the first method, because it will save you a lot of time and work. The first method also does the groundwork of setting up a relationship which can be used for any number of other find calls and conditions besides the one you need now. However, cakePHP does support a syntax for defining your own joins. It would be done like this, from the MessagesController:

$this->Message->find('all', array(
    'joins' => array(
        array(
            'table' => 'users',
            'alias' => 'UserJoin',
            'type' => 'INNER',
            'conditions' => array(
                'UserJoin.id = Message.from'
            )
        )
    ),
    'conditions' => array(
        'Message.to' => 4
    ),
    'fields' => array('UserJoin.*', 'Message.*'),
    'order' => 'Message.datetime DESC'
));

Note, I've left the field name messages.from the same as your current table in this example.

Using two relationships to the same model

Here is how you can do the first example using two relationships to the same model:

class User extends AppModel {
    public $actsAs = array('Containable');
    public $hasMany = array(
        'MessagesSent' => array(
            'className'  => 'Message',
            'foreignKey' => 'from'
         )
    );
    public $belongsTo = array(
        'MessagesReceived' => array(
            'className'  => 'Message',
            'foreignKey' => 'to'
         )
    );
}

class Message extends AppModel {
    public $actsAs = array('Containable');
    public $belongsTo = array(
        'UserFrom' => array(
            'className'  => 'User',
            'foreignKey' => 'from'
        )
    );
    public $hasMany = array(
        'UserTo' => array(
            'className'  => 'User',
            'foreignKey' => 'to'
        )
    );
}

Now you can do your find call like this:

$this->Message->find('all', array(
    'contain' => array('UserFrom')
    'conditions' => array(
        'Message.to' => 4
    ),
    'order' => 'Message.datetime DESC'
));

How to detect lowercase letters in Python?

You should use raw_input to take a string input. then use islower method of str object.

s = raw_input('Type a word')
l = []
for c in s.strip():
    if c.islower():
        print c
        l.append(c)
print 'Total number of lowercase letters: %d'%(len(l) + 1)

Just do -

dir(s)

and you will find islower and other attributes of str

How do I make a file:// hyperlink that works in both IE and Firefox?

just use

file:///

works in IE, Firefox and Chrome as far as I can tell.

see http://msdn.microsoft.com/en-us/library/aa767731(VS.85).aspx for more info

Using PowerShell credentials without being prompted for a password

Here are two ways you could do this, if you are scheduling the reboot.

First you could create a task on one machine using credentials that have rights needed to connect and reboot another machine. This makes the scheduler responsible for securely storing the credentials. The reboot command (I'm a Powershell guy, but this is cleaner.) is:

SHUTDOWN /r /f /m \\ComputerName

The command line to create a scheduled task on the local machine, to remotely reboot another, would be:

SCHTASKS /Create /TN "Reboot Server" /TR "shutdown.exe /r /f /m \\ComputerName" /SC ONCE /ST 00:00 /SD "12/24/2012" /RU "domain\username" /RP "password"

I prefer the second way, where you use your current credentials to create a scheduled task that runs with the system account on a remote machine.

SCHTASKS /Create /TN "Reboot Server" /TR "shutdown.exe /r /f" /SC ONCE /ST 00:00 /SD "12/24/2012" /RU SYSTEM /S ComputerName

This also works through the GUI, just enter SYSTEM as the user name, leaving the password fields blank.

how do I change text in a label with swift?

Swift uses the same cocoa-touch API. You can call all the same methods, but they will use Swift's syntax. In this example you can do something like this:

self.simpleLabel.text = "message"

Note the setText method isn't available. Setting the label's text with = will automatically call the setter in swift.

Android Push Notifications: Icon not displaying in notification, white square shown instead

If you wan to provide lollipop support notification icon then make two type notification icon :

  1. normal notification icon : for below lollipop version.
  2. notification icon with transparent background : for lollipop and above version.

Now set appropriate icon to notification builder at run time base on OS version :

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this);
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    mBuilder.setSmallIcon(R.drawable.ic_push_notification_transperent);
} else {
    mBuilder.setSmallIcon(R.drawable.ic_push_notification);
}

appending array to FormData and send via AJAX

Typescript version:

export class Utility {      
    public static convertModelToFormData(model: any, form: FormData = null, namespace = ''): FormData {
        let formData = form || new FormData();
        let formKey;

        for (let propertyName in model) {
            if (!model.hasOwnProperty(propertyName) || !model[propertyName]) continue;
            let formKey = namespace ? `${namespace}[${propertyName}]` : propertyName;
            if (model[propertyName] instanceof Date)
                formData.append(formKey, model[propertyName].toISOString());
            else if (model[propertyName] instanceof Array) {
                model[propertyName].forEach((element, index) => {
                    const tempFormKey = `${formKey}[${index}]`;
                    this.convertModelToFormData(element, formData, tempFormKey);
                });
            }
            else if (typeof model[propertyName] === 'object' && !(model[propertyName] instanceof File))
                this.convertModelToFormData(model[propertyName], formData, formKey);
            else
                formData.append(formKey, model[propertyName].toString());
        }
        return formData;
    }
}

Using:

let formData = Utility.convertModelToFormData(model);

How to Get XML Node from XDocument

The .Elements operation returns a LIST of XElements - but what you really want is a SINGLE element. Add this:

XElement Contacts = (from xml2 in XMLDoc.Elements("Contacts").Elements("Node")
                    where xml2.Element("ID").Value == variable
                    select xml2).FirstOrDefault();

This way, you tell LINQ to give you the first (or NULL, if none are there) from that LIST of XElements you're selecting.

Marc

Which to use <div class="name"> or <div id="name">?

ID provides a unique indentifier for the element, in case you want to manipulate it in JavaScript. The class attribute can be used to treat a group of HTML elements the same, particularly in regards to fonts, colors and other style properties...

How to get UTC+0 date in Java 8?

With Java 8 you can write:

OffsetDateTime utc = OffsetDateTime.now(ZoneOffset.UTC);

To answer your comment, you can then convert it to a Date (unless you depend on legacy code I don't see any reason why) or to millis since the epochs:

Date date = Date.from(utc.toInstant());
long epochMillis = utc.toInstant().toEpochMilli();

No operator matches the given name and argument type(s). You might need to add explicit type casts. -- Netbeans, Postgresql 8.4 and Glassfish

In query where you are passing query parameters, typecast parameter to an integer

e.g. in the case of PostgreSQL, it might be

where table_name.column_name_with_integer_type = (:named_parameter_of_character_type)::integer

::integer will convert the parameter value into an integer.

Convert from days to milliseconds

24 hours = 86400 seconds = 86400000 milliseconds. Just multiply your number with 86400000.

Render Content Dynamically from an array map function in React Native

lapsList() {

    return this.state.laps.map((data) => {
      return (
        <View><Text>{data.time}</Text></View>
      )
    })
}

You forgot to return the map. this code will resolve the issue.

Using ffmpeg to encode a high quality video

Make sure the PNGs are fully opaque before creating the video

e.g. with imagemagick, give them a black background:

convert 0.png -background black -flatten +matte 0_opaque.png

From my tests, no bitrate or codec is sufficient to make the video look good if you feed ffmpeg PNGs with transparency

Regular expression for number with length of 4, 5 or 6

[0-9]{4,6} can be shortened to \d{4,6}

Can I run javascript before the whole page is loaded?

You can run javascript code at any time. AFAIK it is executed at the moment the browser reaches the <script> tag where it is in. But you cannot access elements that are not loaded yet.

So if you need access to elements, you should wait until the DOM is loaded (this does not mean the whole page is loaded, including images and stuff. It's only the structure of the document, which is loaded much earlier, so you usually won't notice a delay), using the DOMContentLoaded event or functions like $.ready in jQuery.

Convert special characters to HTML in Javascript

function char_convert() {

    var chars = ["©","Û","®","ž","Ü","Ÿ","Ý","$","Þ","%","¡","ß","¢","à","£","á","À","¤","â","Á","¥","ã","Â","¦","ä","Ã","§","å","Ä","¨","æ","Å","©","ç","Æ","ª","è","Ç","«","é","È","¬","ê","É","­","ë","Ê","®","ì","Ë","¯","í","Ì","°","î","Í","±","ï","Î","²","ð","Ï","³","ñ","Ð","´","ò","Ñ","µ","ó","Õ","¶","ô","Ö","·","õ","Ø","¸","ö","Ù","¹","÷","Ú","º","ø","Û","»","ù","Ü","@","¼","ú","Ý","½","û","Þ","€","¾","ü","ß","¿","ý","à","‚","À","þ","á","ƒ","Á","ÿ","å","„","Â","æ","…","Ã","ç","†","Ä","è","‡","Å","é","ˆ","Æ","ê","‰","Ç","ë","Š","È","ì","‹","É","í","Œ","Ê","î","Ë","ï","Ž","Ì","ð","Í","ñ","Î","ò","‘","Ï","ó","’","Ð","ô","“","Ñ","õ","”","Ò","ö","•","Ó","ø","–","Ô","ù","—","Õ","ú","˜","Ö","û","™","×","ý","š","Ø","þ","›","Ù","ÿ","œ","Ú"]; 
    var codes = ["&copy;","&#219;","&reg;","&#158;","&#220;","&#159;","&#221;","&#36;","&#222;","&#37;","&#161;","&#223;","&#162;","&#224;","&#163;","&#225;","&Agrave;","&#164;","&#226;","&Aacute;","&#165;","&#227;","&Acirc;","&#166;","&#228;","&Atilde;","&#167;","&#229;","&Auml;","&#168;","&#230;","&Aring;","&#169;","&#231;","&AElig;","&#170;","&#232;","&Ccedil;","&#171;","&#233;","&Egrave;","&#172;","&#234;","&Eacute;","&#173;","&#235;","&Ecirc;","&#174;","&#236;","&Euml;","&#175;","&#237;","&Igrave;","&#176;","&#238;","&Iacute;","&#177;","&#239;","&Icirc;","&#178;","&#240;","&Iuml;","&#179;","&#241;","&ETH;","&#180;","&#242;","&Ntilde;","&#181;","&#243;","&Otilde;","&#182;","&#244;","&Ouml;","&#183;","&#245;","&Oslash;","&#184;","&#246;","&Ugrave;","&#185;","&#247;","&Uacute;","&#186;","&#248;","&Ucirc;","&#187;","&#249;","&Uuml;","&#64;","&#188;","&#250;","&Yacute;","&#189;","&#251;","&THORN;","&#128;","&#190;","&#252","&szlig;","&#191;","&#253;","&agrave;","&#130;","&#192;","&#254;","&aacute;","&#131;","&#193;","&#255;","&aring;","&#132;","&#194;","&aelig;","&#133;","&#195;","&ccedil;","&#134;","&#196;","&egrave;","&#135;","&#197;","&eacute;","&#136;","&#198;","&ecirc;","&#137;","&#199;","&euml;","&#138;","&#200;","&igrave;","&#139;","&#201;","&iacute;","&#140;","&#202;","&icirc;","&#203;","&iuml;","&#142;","&#204;","&eth;","&#205;","&ntilde;","&#206;","&ograve;","&#145;","&#207;","&oacute;","&#146;","&#208;","&ocirc;","&#147;","&#209;","&otilde;","&#148;","&#210;","&ouml;","&#149;","&#211;","&oslash;","&#150;","&#212;","&ugrave;","&#151;","&#213;","&uacute;","&#152;","&#214;","&ucirc;","&#153;","&#215;","&yacute;","&#154;","&#216;","&thorn;","&#155;","&#217;","&yuml;","&#156;","&#218;"];

    for(x=0; x<chars.length; x++){
        for (i=0; i<arguments.length; i++){
            arguments[i].value = arguments[i].value.replace(chars[x], codes[x]);
        }
    }
 }

char_convert(this);

How to increase an array's length

You can't increase the array's length if it is not declared in heap memory (see below code which first array input is asked by user and then it asks how much you want to increase array and also copy previous array elements):

#include<stdio.h>
#include<stdlib.h>

int * increasesize(int * p,int * q,int x)
{
    int i;
    for(i=0;i<x;i++)
    {
         q[i]=p[i];
    }
    free(p);
    p=q;
    return p;
}
void display(int * q,int x)
{
    int i;
    for(i=0;i<x;i++)
    {
        printf("%d \n",q[i]);
        
    }
}

int main()
{
    int x,i;
    printf("enter no of element to create array");
    scanf("%d",&x);
    int * p=(int *)malloc(x*sizeof(int));
    printf("\n enter number in the array\n");
    for(i=0;i<x;i++)
    {
        scanf("%d",&p[i]);
    }
    int y;
    printf("\nenter the new size to create new size of array");
    scanf("%d",&y);
    int * q=(int *)malloc(y*sizeof(int));
    display(increasesize(p,q,x),y);
    free(q);
}

How to add and get Header values in WebApi

Another way using a the TryGetValues method.

public string Postsam([FromBody]object jsonData)
{
    IEnumerable<string> headerValues;

    if (Request.Headers.TryGetValues("Custom", out headerValues))
    {
        string token = headerValues.First();
    }
}   

How to use jQuery with TypeScript

In my case I had to do this

npm install @types/jquery --save-dev // install jquery type as dev dependency so TS can compile properly
npm install jquery --save // save jquery as a dependency

Then in the script file A.ts

import * as $ from "jquery";
... jquery code ...

SQL query to find record with ID not in another table

Use LEFT JOIN

SELECT  a.*
FROM    table1 a
            LEFT JOIN table2 b
                on a.ID = b.ID
WHERE   b.id IS NULL

How do I multiply each element in a list by a number?

Multiplying each element in my_list by k:

k = 5
my_list = [1,2,3,4]
result = list(map(lambda x: x * k, my_list))

resulting in: [5, 10, 15, 20]

Tomcat view catalina.out log file

Tomcat 7 Ubuntu Server 12.04 LTS:

tail -f /var/log/tomcat7/catalina.out

Performance of Java matrix math libraries?

You may want to check out the jblas project. It's a relatively new Java library that uses BLAS, LAPACK and ATLAS for high-performance matrix operations.

The developer has posted some benchmarks in which jblas comes off favourably against MTJ and Colt.

How to change date format (MM/DD/YY) to (YYYY-MM-DD) in date picker

Use the dateFormat option

 $(function(){
        $("#to").datepicker({ dateFormat: 'yy-mm-dd' });
        $("#from").datepicker({ dateFormat: 'yy-mm-dd' }).bind("change",function(){
            var minValue = $(this).val();
            minValue = $.datepicker.parseDate("yy-mm-dd", minValue);
            minValue.setDate(minValue.getDate()+1);
            $("#to").datepicker( "option", "minDate", minValue );
        })
    });

Demo at http://jsfiddle.net/gaby/WArtA/

multiple conditions for filter in spark data frames

If we want partial match just like contains, we can chain the contain call like this :

def getSelectedTablesRows2(allTablesInfoDF: DataFrame, tableNames: Seq[String]): DataFrame = {

    val tableFilters = tableNames.map(_.toLowerCase()).map(name => lower(col("table_name")).contains(name))
    val finalFilter = tableFilters.fold(lit(false))((accu, newTableFilter) => accu or newTableFilter)
    allTablesInfoDF.where(finalFilter)

  }

What's "tools:context" in Android layout files?

This is best solution : https://developer.android.com/studio/write/tool-attributes

This is design attributes we can set activty context in xml like

tools:context=".activity.ActivityName"

Adapter:

tools:context="com.PackegaName.AdapterName"

enter image description here

You can navigate to java class when clicking on the marked icon and tools have more features like

tools:text=""
tools:visibility:""
tools:listItems=""//for recycler view 

etx

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

Just a variation on the answers above.

I tried the straight up node command above without success, but the suggestion from this Angular CLI issue worked for me - you create a Node script in your package.json file to increase the memory available to Node when you run your production build.

So if you want to increase the memory available to Node to 4gb (max-old-space-size=4096), your Node command would be node --max-old-space-size=4096 ./node_modules/@angular/cli/bin/ng build --prod. (increase or decrease the amount of memory depending on your needs as well - 4gb worked for me, but you may need more or less). You would then add it to your package.json 'scripts' section like this:

"prod": "node --max-old-space-size=4096 ./node_modules/@angular/cli/bin/ng build --prod"

It would be contained in the scripts object along with the other scripts available - e.g.:

"scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "prod": "node --max-old-space-size=4096./node_modules/@angular/cli/bin/ng build --prod"
}

And you run it by calling npm run prod (you may need to run sudo npm run prod if you're on a Mac or Linux).

Note there may be an underlying issue which is causing Node to need more memory - this doesn't address that if that's the case - but it at least gives Node the memory it needs to perform the build.

PHP: Limit foreach() statement?

You can either use

break;

or

foreach() if ($tmp++ < 2) {
}

(the second solution is even worse)

With CSS, use "..." for overflowed block of multi-lines

a pure css method base on -webkit-line-clamp:

_x000D_
_x000D_
@-webkit-keyframes ellipsis {/*for test*/_x000D_
    0% { width: 622px }_x000D_
    50% { width: 311px }_x000D_
    100% { width: 622px }_x000D_
}_x000D_
.ellipsis {_x000D_
    max-height: 40px;/* h*n */_x000D_
    overflow: hidden;_x000D_
    background: #eee;_x000D_
_x000D_
    -webkit-animation: ellipsis ease 5s infinite;/*for test*/_x000D_
    /**_x000D_
    overflow: visible;_x000D_
    /**/_x000D_
}_x000D_
.ellipsis .content {_x000D_
    position: relative;_x000D_
    display: -webkit-box;_x000D_
    -webkit-box-orient: vertical;_x000D_
    -webkit-box-pack: center;_x000D_
    font-size: 50px;/* w */_x000D_
    line-height: 20px;/* line-height h */_x000D_
    color: transparent;_x000D_
    -webkit-line-clamp: 2;/* max row number n */_x000D_
    vertical-align: top;_x000D_
}_x000D_
.ellipsis .text {_x000D_
    display: inline;_x000D_
    vertical-align: top;_x000D_
    font-size: 14px;_x000D_
    color: #000;_x000D_
}_x000D_
.ellipsis .overlay {_x000D_
    position: absolute;_x000D_
    top: 0;_x000D_
    left: 50%;_x000D_
    width: 100%;_x000D_
    height: 100%;_x000D_
    overflow: hidden;_x000D_
_x000D_
    /**_x000D_
    overflow: visible;_x000D_
    left: 0;_x000D_
    background: rgba(0,0,0,.5);_x000D_
    /**/_x000D_
}_x000D_
.ellipsis .overlay:before {_x000D_
    content: "";_x000D_
    display: block;_x000D_
    float: left;_x000D_
    width: 50%;_x000D_
    height: 100%;_x000D_
_x000D_
    /**_x000D_
    background: lightgreen;_x000D_
    /**/_x000D_
}_x000D_
.ellipsis .placeholder {_x000D_
    float: left;_x000D_
    width: 50%;_x000D_
    height: 40px;/* h*n */_x000D_
_x000D_
    /**_x000D_
    background: lightblue;_x000D_
    /**/_x000D_
}_x000D_
.ellipsis .more {_x000D_
    position: relative;_x000D_
    top: -20px;/* -h */_x000D_
    left: -50px;/* -w */_x000D_
    float: left;_x000D_
    color: #000;_x000D_
    width: 50px;/* width of the .more w */_x000D_
    height: 20px;/* h */_x000D_
    font-size: 14px;_x000D_
_x000D_
    /**_x000D_
    top: 0;_x000D_
    left: 0;_x000D_
    background: orange;_x000D_
    /**/_x000D_
}
_x000D_
<div class='ellipsis'>_x000D_
    <div class='content'>_x000D_
        <div class='text'>text text text text text text text text text text text text text text text text text text text text text </div>_x000D_
        <div class='overlay'>_x000D_
            <div class='placeholder'></div>_x000D_
            <div class='more'>...more</div>_x000D_
        </div>_x000D_
    </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

"PKIX path building failed" and "unable to find valid certification path to requested target"

I was facing the same issue, i was using 8.1.0-3, but later i used 9.2.1-0 and the issue was fixed without any manual steps. The self-signed certificate worked fine.