Programs & Examples On #Compiler directives

C# if/then directives for debug vs release

Slightly modified (bastardized?) version of the answer by Tod Thomson as a static function rather than a separate class (I wanted to be able to call it in a WebForm viewbinding from a viewutils class I already had included).

public static bool isDebugging() {
    bool debugging = false;

    WellAreWe(ref debugging);

    return debugging;
}

[Conditional("DEBUG")]
private static void WellAreWe(ref bool debugging)
{
    debugging = true;
}

Video 100% width and height

This works for me for video in a div container.

_x000D_
_x000D_
.videoContainer _x000D_
{_x000D_
    position:absolute;_x000D_
    height:100%;_x000D_
    width:100%;_x000D_
    overflow: hidden;_x000D_
}_x000D_
_x000D_
.videoContainer video _x000D_
{_x000D_
    min-width: 100%;_x000D_
    min-height: 100%;_x000D_
}
_x000D_
_x000D_
_x000D_

Reference: http://www.codesynthesis.co.uk/tutorials/html-5-full-screen-and-responsive-videos

Why use the params keyword?

It allows you to add as many base type parameters in your call as you like.

addTwoEach(10, 2, 4, 6)

whereas with the second form you have to use an array as parameter

addTwoEach(new int[] {10,2,4,6})

change background image in body

If you're page has an Open Graph image, commonly used for social sharing, you can use it to set the background image at runtime with vanilla JavaScript like so:

<script>
  const meta = document.querySelector('[property="og:image"]');
  const body = document.querySelector("body");
  body.style.background = `url(${meta.content})`;
</script>

The above uses document.querySelector and Attribute Selectors to assign meta the first Open Graph image it selects. A similar task is performed to get the body. Finally, string interpolation is used to assign body the background.style the value of the path to the Open Graph image.

If you want the image to cover the entire viewport and stay fixed set background-size like so:

body.style.background = `url(${meta.content}) center center no-repeat fixed`;
body.style.backgroundSize = 'cover';

Using this approach you can set a low-quality background image placeholder using CSS and swap with a high-fidelity image later using an image onload event, thereby reducing perceived latency.

Replace last occurrence of character in string

_x000D_
_x000D_
var someString = "(/n{})+++(/n{})---(/n{})$$$";_x000D_
var toRemove = "(/n{})"; // should find & remove last occurrence _x000D_
_x000D_
function removeLast(s, r){_x000D_
  s = s.split(r)_x000D_
  return s.slice(0,-1).join(r) + s.pop()_x000D_
}_x000D_
_x000D_
console.log(_x000D_
  removeLast(someString, toRemove)_x000D_
)
_x000D_
_x000D_
_x000D_

Breakdown:

s = s.split(toRemove)         // ["", "+++", "---", "$$$"]
s.slice(0,-1)                 //  ["", "+++", "---"]   
s.slice(0,-1).join(toRemove)  // "})()+++})()---"
s.pop()                       //  "$$$"   

Resetting remote to a certain commit

If your branch is not development or production, the easiest way to achieve this is resetting to a certain commit locally and create a new branch from there. You can use:

git checkout 000000

(where 000000 is the commit id where you want to go) in your problematic branch and then simply create a new branch:

git remote add [name_of_your_remote]

Then you can create a new PR and all will work fine!

CSS: Background image and padding

You can use percent values:

background: yellow url("arrow1.gif") no-repeat 95% 50%;

Not pixel perfect, but…

What is the cleanest way to ssh and run multiple commands in Bash?

This works well for creating scripts, as you do not have to include other files:

#!/bin/bash
ssh <my_user>@<my_host> "bash -s" << EOF
    # here you just type all your commmands, as you can see, i.e.
    touch /tmp/test1;
    touch /tmp/test2;
    touch /tmp/test3;
EOF

# you can use '$(which bash) -s' instead of my "bash -s" as well
# but bash is usually being found in a standard location
# so for easier memorizing it i leave that out
# since i dont fat-finger my $PATH that bad so it cant even find /bin/bash ..

How to import functions from different js file in a Vue+webpack+vue-loader project

Say I want to import data into a component from src/mylib.js:

var test = {
  foo () { console.log('foo') },
  bar () { console.log('bar') },
  baz () { console.log('baz') }
}

export default test

In my .Vue file I simply imported test from src/mylib.js:

<script> 
  import test from '@/mylib'

  console.log(test.foo())
  ...
</script>

how to save and read array of array in NSUserdefaults in swift?

Swift 4.0

Store:

let arrayFruit = ["Apple","Banana","Orange","Grapes","Watermelon"]    

 //store in user default
 UserDefaults.standard.set(arrayFruit, forKey: "arrayFruit")

Fetch:

if let arr = UserDefaults.standard.array(forKey: "arrayFruit") as? [String]{
        print(arr)
    }

Where is the Microsoft.IdentityModel dll

How about a NuGet Windows Identity Foundation. Just add it you you project and away you go! Its one of the MS owned NuGets so should be maintained accordingly.

EDIT: In Windows 8 Windows Identity Foundation is installed (enabled) by turning a windows feature on in Control Panel > All Control Panel Items > Programs and Features > Turn Windows feature on or off the feature is Windows Identity Foundation 3.5. Installers linked in the answer above will not work on Windows 8

Get login username in java

Below is a solution for WINDOWS ONLY

In cases where the application (like Tomcat) is started as a windows service, the System.getProperty("user.name") or System.getenv().get("USERNAME") return the user who started the service and not the current logged in user name.

Also in Java 9 the NTSystem etc classes will not be accessible

So workaround for windows: You can use wmic, so you have to run the below command

wmic ComputerSystem get UserName

If available, this will return output of the form:

UserName
{domain}\{logged-in-user-name}

Note: For windows you need to use cmd /c as a prefix, so below is a crude program as an example:

    Process exec = Runtime.getRuntime().exec("cmd /c wmic ComputerSystem get UserName".split(" "));
    System.out.println(exec.waitFor());
    try (BufferedReader bw = new BufferedReader(new InputStreamReader(exec.getInputStream()))) {
        System.out.println(bw.readLine() + "\n" + bw.readLine()+ "\n" + bw.readLine());
    }

Java SecurityException: signer information does not match

A. If you use maven, an useful way to debug clashing jars is:

mvn dependency:tree

For example, for an exception:

java.lang.SecurityException: class "javax.servlet.HttpConstraintElement"'s signer information does not match signer information of other classes in the same package

we do:

mvn dependency:tree|grep servlet

Its output:

[INFO] +- javax.servlet:servlet-api:jar:2.5:compile
[INFO] +- javax.servlet:jstl:jar:1.2:compile
[INFO] |  +- org.eclipse.jetty.orbit:javax.servlet.jsp:jar:2.2.0.v201112011158:compile
[INFO] |  +- org.eclipse.jetty.orbit:javax.servlet.jsp.jstl:jar:1.2.0.v201105211821:compile
[INFO] |  +- org.eclipse.jetty.orbit:javax.servlet:jar:3.0.0.v201112011016:compile
[INFO] +- org.eclipse.jetty:jetty-servlet:jar:9.0.0.RC2:compile

shows clashing servlet-api 2.5 and javax.servlet 3.0.0.x.

B. Other useful hints (how to debug the security exception and how to exclude maven deps) are at the question at Signer information does not match.

Initialize a string variable in Python: "" or None?

If not having a value has a meaning in your program (e.g. an optional value), you should use None. That's its purpose anyway.

If the value must be provided by the caller of __init__, I would recommend not to initialize it.

If "" makes sense as a default value, use it.

In Python the type is deduced from the usage. Hence, you can change the type by just assigning a value of another type.

>>> x = None
>>> print type(x)
<type 'NoneType'>
>>> x = "text"
>>> print type(x)
<type 'str'>
>>> x = 42
>>> print type(x)
<type 'int'>

HTML button opening link in new tab

You can also add this to your form:

<form ... target="_blank">

Move SQL Server 2008 database files to a new folder location

You forgot to mention the name of your database (is it "my"?).

ALTER DATABASE my SET SINGLE_USER WITH ROLLBACK IMMEDIATE;

ALTER DATABASE my SET OFFLINE;

ALTER DATABASE my MODIFY FILE 
(
   Name = my_Data,
   Filename = 'D:\DATA\my.MDF'
);

ALTER DATABASE my MODIFY FILE 
(
   Name = my_Log, 
   Filename = 'D:\DATA\my_1.LDF'
);

Now here you must manually move the files from their current location to D:\Data\ (and remember to rename them manually if you changed them in the MODIFY FILE command) ... then you can bring the database back online:

ALTER DATABASE my SET ONLINE;

ALTER DATABASE my SET MULTI_USER;

This assumes that the SQL Server service account has sufficient privileges on the D:\Data\ folder. If not you will receive errors at the SET ONLINE command.

Reading a .txt file using Scanner class in Java

You have to put file extension here

File file = new File("10_Random.txt");

How to set height property for SPAN

Assuming you don't want to make it a block element, then you might try:

.title  {
    display: inline-block; /* which allows you to set the height/width; but this isn't cross-browser, particularly as regards IE < 7 */
    line-height: 2em; /* or */
    padding-top: 1em;
    padding-bottom: 1em;
}

But the easiest solution is to simply treat the .title as a block-level element, and using the appropriate heading tags <h1> through <h6>.

How do I add space between two variables after a print in Python

print( "hello " +k+ "  " +ln);

where k and ln are variables

How can I check out a GitHub pull request with git?

Suppose your origin and upstream info is like below

   $ git remote -v
   origin  [email protected]:<yourname>/<repo_name>.git (fetch)
   origin  [email protected]:<yourname>/<repo_name>.git (push)
   upstream   [email protected]:<repo_owner>/<repo_name>.git (fetch)
   upstream   [email protected]:<repo_owner>/<repo_name>.git (push)

and your branch name is like

   <repo_owner>:<BranchName>

then

   git pull origin <BranchName>

shall do the job

Converting Java file:// URL to File(...) path, platform independent, including UNC paths

Building on @SotiriosDelimanolis's comment, here is a method to deal with URLs (such as file:...) and non-URLs (such as C:...), using Spring's FileSystemResource:

public FileSystemResource get(String file) {
    try {
        // First try to resolve as URL (file:...)
        Path path = Paths.get(new URL(file).toURI());
        FileSystemResource resource = new FileSystemResource(path.toFile());
        return resource;
    } catch (URISyntaxException | MalformedURLException e) {
        // If given file string isn't an URL, fall back to using a normal file 
        return new FileSystemResource(file);
    }
}

How to convert 'binary string' to normal string in Python3?

Decode it.

>>> b'a string'.decode('ascii')
'a string'

To get bytes from string, encode it.

>>> 'a string'.encode('ascii')
b'a string'

How to make a HTML Page in A4 paper size page(s)?

A4 size is 210x297mm

So you can set the HTML page to fit those sizes with CSS:

html,body{
    height:297mm;
    width:210mm;
}

How do I set an un-selectable default description in a select (drop-down) menu in HTML?

Building on Oded's answer, you could also set the default option but not make it a selectable option if it's just dummy text. For example you could do:

<option selected="selected" disabled="disabled">Select a language</option>

This would show "Select a language" before the user clicks the select box but the user wouldn't be able to select it because of the disabled attribute.

How to run mvim (MacVim) from Terminal?

There should be a script named mvim in the root of the .bz2 file. Copy this somewhere into your $PATH ( /usr/local/bin would be good ) and you should be sorted.

How should I choose an authentication library for CodeIgniter?

Maybe you'd find Redux suiting your needs. It's no overkill and comes packed solely with bare features most of us would require. The dev and contributors were very strict on what code was contributed.

This is the official page

How enable auto-format code for Intellij IDEA?

File-> Settings -> Keymap-> Complete Current Statement

I added ; key in there. When typing ';' at the end of the line, it is auto-formatting.

UPDATE

I realized that this will cause some problems in some situations. Use Ctrl+Shift+Enter instead. This key can be used in any position of cursor in a line. It will add ; at the end of the line. Also this shortcut have some other useful features.

like:

public void someMethod()

after shortcut:

public void someMethod() {
    // The cursor is here
}

so formatting on inserting ; is not necessary.

Test if a command outputs an empty string

As mentioned by tripleee in the question comments , use moreutils ifne (if input not empty).

In this case we want ifne -n which negates the test:

ls -A /tmp/empty | ifne -n command-to-run-if-empty-input

The advantage of this over many of the another answers when the output of the initial command is non-empty. ifne will start writing it to STDOUT straight away, rather than buffering the entire output then writing it later, which is important if the initial output is slowly generated or extremely long and would overflow the maximum length of a shell variable.

There are a few utils in moreutils that arguably should be in coreutils -- they're worth checking out if you spend a lot of time living in a shell.

In particular interest to the OP may be dirempty/exists tool which at the time of writing is still under consideration, and has been for some time (it could probably use a bump).

Limit String Length

From php 4.0.6 , there is a function for the exact same thing

function mb_strimwidth can be used for your requirement

<?php
echo mb_strimwidth("Hello World", 0, 10, "...");
//Hello W...
?>

It does have more options though,here is the documentation for this mb_strimwidth

How to input matrix (2D list) in Python?

Creating matrix with prepopulated numbers can be done with list comprehension. It may be hard to read but it gets job done:

rows = int(input('Number of rows: '))
cols = int(input('Number of columns: '))
matrix = [[i + cols * j for i in range(1, cols + 1)] for j in range(rows)]

with 2 rows and 3 columns matrix will be [[1, 2, 3], [4, 5, 6]], with 3 rows and 2 columns matrix will be [[1, 2], [3, 4], [5, 6]] etc.

Check if an element is present in an array

Since ECMAScript6, one can use Set :

var myArray = ['A', 'B', 'C'];
var mySet = new Set(myArray);
var hasB = mySet.has('B'); // true
var hasZ = mySet.has('Z'); // false

Change project name on Android Studio

To change the apps name in Android Studio:

  1. Close the project in Android studio and get rid of it from the quick start side of the launcher ( Should be a mini next to the name).

  2. Close Android Studio.

  3. Go into where your app file is located and rename it (Under My Documents Usually).

  4. Restart Android Studio, select add new project and navigate to the folder that was renamed.

Changing the label of the launcher of the application / The applications actual name:

  1. Go into your initial folder (app)
  2. Go into manifests
  3. Go into AndroidManifest.xml.
  4. Rename android:label= _____ to whatever you want to rename your app to

Eg: android:label="Developer Portal".

  1. Click Save All.

jQuery changing style of HTML element

changing style with jquery

Try This

$('#selector_id').css('display','none');

You can also change multiple attribute in a single query

Try This

$('#replace-div').css({'padding-top': '5px' , 'margin' : '10px'});

How do I compare two Integers?

The Integer class implements Comparable<Integer>, so you could try,

x.compareTo(y) == 0

also, if rather than equality, you are looking to compare these integers, then,

x.compareTo(y) < 0 will tell you if x is less than y.

x.compareTo(y) > 0 will tell you if x is greater than y.

Of course, it would be wise, in these examples, to ensure that x is non-null before making these calls.

Eclipse CDT: Symbol 'cout' could not be resolved

If all else fails, like it did in my case, then just disable annotations. I started a c++11 project with own makefile but couldn't fix all the problems. Even if you disable annotations, eclipse will still be able to help you do some autocompletion. Most importantly, the debugger still works!

Is it possible to add an HTML link in the body of a MAILTO link

It isn't possible as far as I can tell, since a link needs HTML, and mailto links don't create an HTML email.

This is probably for security as you could add javascript or iframes to this link and the email client might open up the end user for vulnerabilities.

When do I use super()?

You call super() to specifically run a constructor of your superclass. Given that a class can have multiple constructors, you can either call a specific constructor using super() or super(param,param) oder you can let Java handle that and call the standard constructor. Remember that classes that follow a class hierarchy follow the "is-a" relationship.

Build error, This project references NuGet

It's a bit old post but I recently ran into this issue. All I did was deleted all the nuget packages from packages folder and restored it. I was able to build the solution successfully. Hopefully helpful to someone.

How to debug Javascript with IE 8

I discovered today that we can now debug Javascript With the developer tool bar plugins integreted in IE 8.

  • Click ? Tools on the toolbar, to the right of the tabs.
  • Select Developer Tools. The Developer Tools dialogue should open.
  • Click the Script tab in the dialogue.
  • Click the Start Debugging button.

You can use watch, breakpoint, see the call stack etc, similarly to debuggers in professional browsers.

You can also use the statement debugger; in your JavaScript code the set a breakpoint.

How can I export Excel files using JavaScript?

If you can generate the Excel file on the server, that is probably the best way. With Excel you can add formatting and get the output to look better. Several Excel options have already been mentioned. If you have a PHP backend, you might consider phpExcel.

If you are trying to do everything on the client in javascript, I don't think Excel is an option. You could create a CSV file and create a data URL to allow the user to download it.

I created a JSFiddle to demonstrate: http://jsfiddle.net/5KRf6/3/

This javascript (assuming you are using jQuery) will take the values out of input boxes in a table and build a CSV formatted string:

var csv = "";
$("table").find("tr").each(function () {
    var sep = "";
    $(this).find("input").each(function () {
        csv += sep + $(this).val();
        sep = ",";
    });
    csv += "\n";
});

If you wish, you can drop the data into a tag on the page (in my case a tag with an id of "csv"):

$("#csv").text(csv);

You can generate a URL to that text with this code:

window.URL = window.URL || window.webkiURL;
var blob = new Blob([csv]);
var blobURL = window.URL.createObjectURL(blob);

Finally, this will add a link to download that data:

$("#downloadLink").html("");
$("<a></a>").
attr("href", blobURL).
attr("download", "data.csv").
text("Download Data").
appendTo('#downloadLink');

Jquery click event not working after append method

Use on :

$('#registered_participants').on('click', '.new_participant_form', function() {

So that the click is delegated to any element in #registered_participants having the class new_participant_form, even if it's added after you bound the event handler.

onActivityResult is not being called in Fragment

This is one of the most popular issue. We can found lots of thread regarding this issue. But none of them is useful for ME.

So I have solved this problem using this solution.

Let's first understand why this is happening.

We can call startActivityForResult directly from Fragment but actually mechanic behind are all handled by Activity.

Once you call startActivityForResult from a Fragment, requestCode will be changed to attach Fragment's identity to the code. That will let Activity be able to track back that who send this request once result is received.

Once Activity was navigated back, the result will be sent to Activity's onActivityResult with the modified requestCode which will be decoded to original requestCode + Fragment's identity. After that, Activity will send the Activity Result to that Fragment through onActivityResult. And it's all done.

The problem is:

Activity could send the result to only the Fragment that has been attached directly to Activity but not the nested one. That's the reason why onActivityResult of nested fragment would never been called no matter what.

Solution:

1) Start Intent in your Fragment by below code:

       /** Pass your fragment reference **/
       frag.startActivityForResult(intent, REQUEST_CODE); // REQUEST_CODE = 12345

2) Now in your Parent Activity override **onActivityResult() :**

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

You have to call this in parent activity to make it work.

3) In your fragment call:

@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == Activity.RESULT_OK) {

       }
}

That's it. With this solution, it could be applied for any single fragment whether it is nested or not. And yes, it also covers all the case! Moreover, the codes are also nice and clean.

How to generate unique IDs for form labels in React?

You could use a library such as node-uuid for this to make sure you get unique ids.

Install using:

npm install node-uuid --save

Then in your react component add the following:

import {default as UUID} from "node-uuid";
import {default as React} from "react";

export default class MyComponent extends React.Component {   
  componentWillMount() {
    this.id = UUID.v4();
  }, 
  render() {
    return (
      <div>
        <label htmlFor={this.id}>My label</label>
        <input id={this.id} type="text"/>
      </div>
    );
  }   
}

How can I get screen resolution in java?

int resolution =Toolkit.getDefaultToolkit().getScreenResolution();

System.out.println(resolution);

What are the new features in C++17?

Language features:

Templates and Generic Code

Lambda

Attributes

Syntax cleanup

Cleaner multi-return and flow control

  • Structured bindings

    • Basically, first-class std::tie with auto
    • Example:
      • const auto [it, inserted] = map.insert( {"foo", bar} );
      • Creates variables it and inserted with deduced type from the pair that map::insert returns.
    • Works with tuple/pair-likes & std::arrays and relatively flat structs
    • Actually named structured bindings in standard
  • if (init; condition) and switch (init; condition)

    • if (const auto [it, inserted] = map.insert( {"foo", bar} ); inserted)
    • Extends the if(decl) to cases where decl isn't convertible-to-bool sensibly.
  • Generalizing range-based for loops

    • Appears to be mostly support for sentinels, or end iterators that are not the same type as begin iterators, which helps with null-terminated loops and the like.
  • if constexpr

    • Much requested feature to simplify almost-generic code.

Misc

Library additions:

Data types

Invoke stuff

File System TS v1

New algorithms

  • for_each_n

  • reduce

  • transform_reduce

  • exclusive_scan

  • inclusive_scan

  • transform_exclusive_scan

  • transform_inclusive_scan

  • Added for threading purposes, exposed even if you aren't using them threaded

Threading

(parts of) Library Fundamentals TS v1 not covered above or below

Container Improvements

Smart pointer changes

Other std datatype improvements:

Misc

Traits

Deprecated

Isocpp.org has has an independent list of changes since C++14; it has been partly pillaged.

Naturally TS work continues in parallel, so there are some TS that are not-quite-ripe that will have to wait for the next iteration. The target for the next iteration is C++20 as previously planned, not C++19 as some rumors implied. C++1O has been avoided.

Initial list taken from this reddit post and this reddit post, with links added via googling or from the above isocpp.org page.

Additional entries pillaged from SD-6 feature-test list.

clang's feature list and library feature list are next to be pillaged. This doesn't seem to be reliable, as it is C++1z, not C++17.

these slides had some features missing elsewhere.

While "what was removed" was not asked, here is a short list of a few things ((mostly?) previous deprecated) that are removed in C++17 from C++:

Removed:

There were rewordings. I am unsure if these have any impact on code, or if they are just cleanups in the standard:

Papers not yet integrated into above:

  • P0505R0 (constexpr chrono)

  • P0418R2 (atomic tweaks)

  • P0512R0 (template argument deduction tweaks)

  • P0490R0 (structured binding tweaks)

  • P0513R0 (changes to std::hash)

  • P0502R0 (parallel exceptions)

  • P0509R1 (updating restrictions on exception handling)

  • P0012R1 (make exception specifications be part of the type system)

  • P0510R0 (restrictions on variants)

  • P0504R0 (tags for optional/variant/any)

  • P0497R0 (shared ptr tweaks)

  • P0508R0 (structured bindings node handles)

  • P0521R0 (shared pointer use count and unique changes?)

Spec changes:

Further reference:

find the array index of an object with a specific key value in underscore

This is to help lodash users. check if your key is present by doing:

hideSelectedCompany(yourKey) {
 return _.findIndex(yourArray, n => n === yourKey) === -1;
}

What is ROWS UNBOUNDED PRECEDING used for in Teradata?

ROWS UNBOUNDED PRECEDING is no Teradata-specific syntax, it's Standard SQL. Together with the ORDER BY it defines the window on which the result is calculated.

Logically a Windowed Aggregate Function is newly calculated for each row within the PARTITION based on all ROWS between a starting row and an ending row.

Starting and ending rows might be fixed or relative to the current row based on the following keywords:

  • CURRENT ROW, the current row
  • UNBOUNDED PRECEDING, all rows before the current row -> fixed
  • UNBOUNDED FOLLOWING, all rows after the current row -> fixed
  • x PRECEDING, x rows before the current row -> relative
  • y FOLLOWING, y rows after the current row -> relative

Possible kinds of calculation include:

  • Both starting and ending row are fixed, the window consists of all rows of a partition, e.g. a Group Sum, i.e. aggregate plus detail rows
  • One end is fixed, the other relative to current row, the number of rows increases or decreases, e.g. a Running Total, Remaining Sum
  • Starting and ending row are relative to current row, the number of rows within a window is fixed, e.g. a Moving Average over n rows

So SUM(x) OVER (ORDER BY col ROWS UNBOUNDED PRECEDING) results in a Cumulative Sum or Running Total

11 -> 11
 2 -> 11 +  2                = 13
 3 -> 13 +  3 (or 11+2+3)    = 16
44 -> 16 + 44 (or 11+2+3+44) = 60

CSS – why doesn’t percentage height work?

You need to give it a container with a height. width uses the viewport as the default width

month name to month number and vice versa in python

Here is a more comprehensive method that can also accept full month names

def month_string_to_number(string):
    m = {
        'jan': 1,
        'feb': 2,
        'mar': 3,
        'apr':4,
         'may':5,
         'jun':6,
         'jul':7,
         'aug':8,
         'sep':9,
         'oct':10,
         'nov':11,
         'dec':12
        }
    s = string.strip()[:3].lower()

    try:
        out = m[s]
        return out
    except:
        raise ValueError('Not a month')

example:

>>> month_string_to_number("October")
10 
>>> month_string_to_number("oct")
10

ImportError: No module named 'django.core.urlresolvers'

In my case the problem was that I had outdated django-stronghold installed (0.2.9). And even though in the code I had:

from django.urls import reverse

I still encountered the error. After I upgraded the version to django-stronghold==0.4.0 the problem disappeard.

How to calculate DATE Difference in PostgreSQL?

Your calculation is correct for DATE types, but if your values are timestamps, you should probably use EXTRACT (or DATE_PART) to be sure to get only the difference in full days;

EXTRACT(DAY FROM MAX(joindate)-MIN(joindate)) AS DateDifference

An SQLfiddle to test with. Note the timestamp difference being 1 second less than 2 full days.

Automatically start forever (node) on system restart

I wrote a script that does exactly this:

https://github.com/chovy/node-startup

I have not tried with forever, but you can customize the command it runs, so it should be straight forward:

/etc/init.d/node-app start
/etc/init.d/node-app restart
/etc/init.d/node-app stop

Accessing Object Memory Address

With ctypes, you can achieve the same thing with

>>> import ctypes
>>> a = (1,2,3)
>>> ctypes.addressof(a)
3077760748L

Documentation:

addressof(C instance) -> integer
Return the address of the C instance internal buffer

Note that in CPython, currently id(a) == ctypes.addressof(a), but ctypes.addressof should return the real address for each Python implementation, if

  • ctypes is supported
  • memory pointers are a valid notion.

Edit: added information about interpreter-independence of ctypes

Responsively change div size keeping aspect ratio

You can do this using pure CSS; no JavaScript needed. This utilizes the (somewhat counterintuitive) fact that padding-top percentages are relative to the containing block's width. Here's an example:

_x000D_
_x000D_
.wrapper {_x000D_
  width: 50%;_x000D_
  /* whatever width you want */_x000D_
  display: inline-block;_x000D_
  position: relative;_x000D_
}_x000D_
.wrapper:after {_x000D_
  padding-top: 56.25%;_x000D_
  /* 16:9 ratio */_x000D_
  display: block;_x000D_
  content: '';_x000D_
}_x000D_
.main {_x000D_
  position: absolute;_x000D_
  top: 0;_x000D_
  bottom: 0;_x000D_
  right: 0;_x000D_
  left: 0;_x000D_
  /* fill parent */_x000D_
  background-color: deepskyblue;_x000D_
  /* let's see it! */_x000D_
  color: white;_x000D_
}
_x000D_
<div class="wrapper">_x000D_
  <div class="main">_x000D_
    This is your div with the specified aspect ratio._x000D_
  </div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Adding minutes to date time in PHP

A bit of a late answer, but the method I would use is:

// Create a new \DateTime instance
$date = DateTime::createFromFormat('Y-m-d H:i:s', '2015-10-26 10:00:00');

// Modify the date
$date->modify('+5 minutes');

// Output
echo $date->format('Y-m-d H:i:s');

Or in PHP >= 5.4

echo (DateTime::createFromFormat('Y-m-d H:i:s', '2015-10-26 10:00:00'))->modify('+5 minutes')->format('Y-m-d H:i:s')

Maven error in eclipse (pom.xml) : Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.12.4

For Unix Users

find ~/.m2 -name "*.lastUpdated" -exec grep -q "Could not transfer" {} \; -print -exec rm {} \;

Right-click your project and choose Update Dependencies

For Windows

  • CD (change directory) to .m2\repository
  • execute the command for /r %i in (*.lastUpdated) do del %i
  • Then right-click your project and choose Update Dependencies

Load content of a div on another page

You just need to add a jquery selector after the url.

See: http://api.jquery.com/load/

Example straight from the API:

$('#result').load('ajax/test.html #container');

So what that does is it loads the #container element from the specified url.

Create PDF with Java

Another alternative would be JasperReports: JasperReports Library. It uses iText itself and is more than a PDF library you asked for, but if it fits your needs I'd go for it.

Simply put, it allows you to design reports that can be filled during runtime. If you use a custom datasource, you might be able to integrate JasperReports easily into the existing system. It would save you the whole layouting troubles, e.g. when invoices span over more sites where each side should have a footer and so on.

How do I filter ForeignKey choices in a Django ModelForm?

In addition to S.Lott's answer and as becomingGuru mentioned in comments, its possible to add the queryset filters by overriding the ModelForm.__init__ function. (This could easily apply to regular forms) it can help with reuse and keeps the view function tidy.

class ClientForm(forms.ModelForm):
    def __init__(self,company,*args,**kwargs):
        super (ClientForm,self ).__init__(*args,**kwargs) # populates the post
        self.fields['rate'].queryset = Rate.objects.filter(company=company)
        self.fields['client'].queryset = Client.objects.filter(company=company)

    class Meta:
        model = Client

def addclient(request, company_id):
        the_company = get_object_or_404(Company, id=company_id)

        if request.POST:
            form = ClientForm(the_company,request.POST)  #<-- Note the extra arg
            if form.is_valid():
                form.save()
                return HttpResponseRedirect(the_company.get_clients_url())
        else:
            form = ClientForm(the_company)

        return render_to_response('addclient.html', 
                                  {'form': form, 'the_company':the_company})

This can be useful for reuse say if you have common filters needed on many models (normally I declare an abstract Form class). E.g.

class UberClientForm(ClientForm):
    class Meta:
        model = UberClient

def view(request):
    ...
    form = UberClientForm(company)
    ...

#or even extend the existing custom init
class PITAClient(ClientForm):
    def __init__(company, *args, **args):
        super (PITAClient,self ).__init__(company,*args,**kwargs)
        self.fields['support_staff'].queryset = User.objects.exclude(user='michael')

Other than that I'm just restating Django blog material of which there are many good ones out there.

Export table to file with column headers (column names) using the bcp utility and SQL Server 2008

You should be able to solve this problem with one cte view and one batch file containing the bcp code. First create the view. Since, it's relatively straightforward, I did not create a temporary table. Normally I do

CREATE VIEW [dbo].[vwxMySAMPLE_EXTRACT_COLUMNS]
  AS
    WITH MYBCP_CTE (COLUMN_NM, ORD_POS, TXT)
     AS
      ( SELECT  COLUMN_NAME
             , ORDINAL_POSITION
             , CAST(COLUMN_NAME AS VARCHAR(MAX))
        FROM [INFORMATION_SCHEMA].[COLUMNS]
        WHERE TABLE_NAME = 'xMySAMPLE_EXTRACT_NEW'
        AND ORDINAL_POSITION = 1

        UNION ALL

        SELECT  V.COLUMN_NAME
              , V.ORDINAL_POSITION
              , CAST(C.TXT + '|' + V.COLUMN_NAME AS VARCHAR(MAX))
        FROM [INFORMATION_SCHEMA].[COLUMNS]  V INNER JOIN MYBCP_CTE C
        ON V.ORDINAL_POSITION = C.ORD_POS+1
        AND V.ORDINAL_POSITION > 1
        WHERE TABLE_NAME = 'xMySAMPLE_EXTRACT_NEW'
      )

      SELECT CC.TXT
      FROM MYBCP_CTE CC INNER JOIN ( SELECT MAX(ORD_POS) AS MX_CNT
                                     FROM MYBCP_CTE C
                                    ) SC
      ON CC.ORD_POS = SC.MX_CNT

Now, create the batch file. I created this in my Temp directory, but I'm lazy.

  cd\
  CD "C:\Program Files\Microsoft SQL Server\110\Tools\Binn"

  set buildhour=%time: =0%
  set buildDate=%DATE:~4,10%
  set backupfiledate=%buildDate:~6,4%%buildDate:~0,2%%buildDate:~3,2%%time:~0,2%%time:~3,2%%time:~6,2%

  echo %backupfiledate%
  pause

The above code just creates a date to append to the end of your file... Next, the first bcp statement with the view to the recursive cte to concatenate it all together.

  bcp "SELECT *  FROM [dbo].[vwxMYSAMPLE_EXTRACT_COLUMNS] OPTION (MAXRECURSION 300)" queryout C:\Temp\Col_NM%backupfiledate%.txt -c -t"|" -S MYSERVERTOLOGINTO -T -q
  bcp "SELECT *  FROM [myDBName].[dbo].[vwxMYSAMPLE_EXTRACT_NEW] " queryout C:\Temp\3316_PHYSDATA_ALL%backupfiledate%.txt -c -t"|" -S MYSERVERTOLOGINTO -T -q

Now merge them together using the copy command:

  copy C:\Temp\Col_NM%backupfiledate%.txt  + C:\Temp\3316_PHYSDATA_ALL%backupfiledate%.txt  C:\Temp\3316_PHYSDATA_ALL%backupfiledate%.csv

All set

How can labels/legends be added for all chart types in chart.js (chartjs.org)?

I know this question is old. But this might be useful for someone who is having the problem with legend. In addition to the answer given by ZaneDarken, I modified the chart.js file to show the legend in my pie chart. I changed the legendTemplate(which is declared many times for every chart type) just above these lines :

_x000D_
_x000D_
Chart.Type.extend({_x000D_
      //Passing in a name registers this chart in the Chart namespace_x000D_
      name: "Doughnut",_x000D_
      //Providing a defaults will also register the deafults in the chart namespace_x000D_
      defaults: defaultConfig,_x000D_
      .......
_x000D_
_x000D_
_x000D_

My legendTemplate is changed from

_x000D_
_x000D_
legendTemplate : "_x000D_
<ul class=\ "<%=name.toLowerCase()%>-legend\">_x000D_
  <% for (var i=0; i<datasets.length; i++){%>_x000D_
    <li><span style=\ "background-color:<%=datasets[i].strokeColor%>\"></span>_x000D_
      <%if(datasets[i].label){%>_x000D_
        <%=datasets[i].label%>_x000D_
          <%}%>_x000D_
    </li>_x000D_
    <%}%>_x000D_
</ul>"
_x000D_
_x000D_
_x000D_

To

_x000D_
_x000D_
legendTemplate: "_x000D_
<ul class=\ "<%=name.toLowerCase()%>-legend\">_x000D_
  <% for (var i=0; i<segments.length; i++){%>_x000D_
    <li><span style=\ "-moz-border-radius:7px 7px 7px 7px; border-radius:7px 7px 7px 7px; margin-right:10px;width:15px;height:15px;display:inline-block;background-color:<%=segments[i].fillColor%>\"> </span>_x000D_
      <%if(segments[i].label){%>_x000D_
        <%=s egments[i].label%>_x000D_
          <%}%>_x000D_
    </li>_x000D_
    <%}%>_x000D_
</ul>"
_x000D_
_x000D_
_x000D_

How to use NSJSONSerialization

This is my code for checking if the received json is an array or dictionary:

NSError *jsonError = nil;
id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&jsonError];

if ([jsonObject isKindOfClass:[NSArray class]]) {
    NSLog(@"its an array!");
    NSArray *jsonArray = (NSArray *)jsonObject;
    NSLog(@"jsonArray - %@",jsonArray);
}
else {
    NSLog(@"its probably a dictionary");
    NSDictionary *jsonDictionary = (NSDictionary *)jsonObject;
    NSLog(@"jsonDictionary - %@",jsonDictionary);
}

I have tried this for options:kNilOptions and NSJSONReadingMutableContainers and works correctly for both.

Obviously, the actual code cannot be this way where I create the NSArray or NSDictionary pointer within the if-else block.

C++ Object Instantiation

There's no reason to new (on the heap) when you can allocate on the stack (unless for some reason you've got a small stack and want to use the heap.

You might want to consider using a shared_ptr (or one of its variants) from the standard library if you do want to allocate on the heap. That'll handle doing the delete for you once all references to the shared_ptr have gone out of existance.

How to export data to an excel file using PHPExcel

Try the below complete example for the same

<?php
  $objPHPExcel = new PHPExcel();
  $query1 = "SELECT * FROM employee";
  $exec1 = mysql_query($query1) or die ("Error in Query1".mysql_error());
  $serialnumber=0;
  //Set header with temp array
  $tmparray =array("Sr.Number","Employee Login","Employee Name");
  //take new main array and set header array in it.
  $sheet =array($tmparray);

  while ($res1 = mysql_fetch_array($exec1))
  {
    $tmparray =array();
    $serialnumber = $serialnumber + 1;
    array_push($tmparray,$serialnumber);
    $employeelogin = $res1['employeelogin'];
    array_push($tmparray,$employeelogin);
    $employeename = $res1['employeename'];
    array_push($tmparray,$employeename);   
    array_push($sheet,$tmparray);
  }
   header('Content-type: application/vnd.ms-excel');
   header('Content-Disposition: attachment; filename="name.xlsx"');
  $worksheet = $objPHPExcel->getActiveSheet();
  foreach($sheet as $row => $columns) {
    foreach($columns as $column => $data) {
        $worksheet->setCellValueByColumnAndRow($column, $row + 1, $data);
    }
  }

  //make first row bold
  $objPHPExcel->getActiveSheet()->getStyle("A1:I1")->getFont()->setBold(true);
  $objPHPExcel->setActiveSheetIndex(0);
  $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
  $objWriter->save(str_replace('.php', '.xlsx', __FILE__));
?>

Using pointer to char array, values in that array can be accessed?

When you want to access an element, you have to first dereference your pointer, and then index the element you want (which is also dereferncing). i.e. you need to do:

printf("\nvalue:%c", (*ptr)[0]); , which is the same as *((*ptr)+0)

Note that working with pointer to arrays are not very common in C. instead, one just use a pointer to the first element in an array, and either deal with the length as a separate element, or place a senitel value at the end of the array, so one can learn when the array ends, e.g.

char arr[5] = {'a','b','c','d','e',0}; 
char *ptr = arr; //same as char *ptr = &arr[0]

printf("\nvalue:%c", ptr[0]);

How to know the version of pip itself

On RHEL "pip -V" works :

$ pip -V
pip 6.1.1 from /usr/lib/python2.6/site-packages (python 2.6)

Conversion failed when converting the varchar value 'simple, ' to data type int

In order to avoid such error you could use CASE + ISNUMERIC to handle scenarios when you cannot convert to int.
Change

CONVERT(INT, CONVERT(VARCHAR(12), a.value))

To

CONVERT(INT,
        CASE
        WHEN IsNumeric(CONVERT(VARCHAR(12), a.value)) = 1 THEN CONVERT(VARCHAR(12),a.value)
        ELSE 0 END) 

Basically this is saying if you cannot convert me to int assign value of 0 (in my example)

Alternatively you can look at this article about creating a custom function that will check if a.value is number: http://www.tek-tips.com/faqs.cfm?fid=6423

How do you fade in/out a background color using jquery?

I wrote a super simple jQuery plugin to accomplish something similar to this. I wanted something really light weight (it's 732 bytes minified), so including a big plugin or UI was out of the question for me. It's still a little rough around the edges, so feedback is welcome.

You can checkout the plugin here: https://gist.github.com/4569265.

Using the plugin, it would be a simple matter to create a highlight effect by changing the background color and then adding a setTimeout to fire the plugin to fade back to the original background color.

How to figure out the SMTP server host?

You could send yourself an email an look in the email header (In Outlook: Open the mail, View->Options, there is 'Internet headers)

Why are unnamed namespaces used and what are their benefits?

Having something in an anonymous namespace means it's local to this translation unit (.cpp file and all its includes) this means that if another symbol with the same name is defined elsewhere there will not be a violation of the One Definition Rule (ODR).

This is the same as the C way of having a static global variable or static function but it can be used for class definitions as well (and should be used rather than static in C++).

All anonymous namespaces in the same file are treated as the same namespace and all anonymous namespaces in different files are distinct. An anonymous namespace is the equivalent of:

namespace __unique_compiler_generated_identifer0x42 {
    ...
}
using namespace __unique_compiler_generated_identifer0x42;

Adjust list style image position?

I'm using something like this, seems pretty clean & simple for me:

ul { 
     list-style:  none;
     /* remove left padding, it's usually unwanted: */
     padding:  0;
}

li:before {
     content:  url(icon.png);
     display:  inline-block;
     vertical-align:  middle;

     /* If you want some space between icon and text: */
     margin-right:   1em;
}

The above code works as is in most of my cases.
For exact adjustment you can modify vertical-align, e.g.:

vertical-align:  top;

/* or */
vertical-align:  -10px;

/* or whatever you need instead of "middle" */

You may set list-style: none on li instead of ul if you prefer.

How do I change the UUID of a virtual disk?

Though you have solved the problem, I just post the reason here for some others with the similar problem.

The reason is there's an space in your path(directory name VirtualBox VMs) which will separate the command. So the error appears.

How to find my php-fpm.sock?

Solved in my case, i look at

sudo tail -f /var/log/nginx/error.log

and error is php5-fpm.sock not found

I look at sudo ls -lah /var/run/

there was no php5-fpm.sock

I edit the www.conf  

sudo vim /etc/php5/fpm/pool.d/www.conf

change

listen = 127.0.0.1:9000

for

listen = /var/run/php5-fpm.sock

and reboot

What is the use of BindingResult interface in spring MVC?

It's important to note that the order of parameters is actually important to spring. The BindingResult needs to come right after the Form that is being validated. Likewise, the [optional] Model parameter needs to come after the BindingResult. Example:

Valid:

@RequestMapping(value = "/entry/updateQuantity", method = RequestMethod.POST)
public String updateEntryQuantity(@Valid final UpdateQuantityForm form,
                                  final BindingResult bindingResult,
                                  @RequestParam("pk") final long pk,
                                  final Model model) {
}

Not Valid:

RequestMapping(value = "/entry/updateQuantity", method = RequestMethod.POST)
public String updateEntryQuantity(@Valid final UpdateQuantityForm form,
                                  @RequestParam("pk") final long pk,
                                  final BindingResult bindingResult,
                                  final Model model) {
}

Append key/value pair to hash with << in Ruby

I had to do a similar thing but I needed to add values with same keys. When I use merge or update I can't push values with same keys. So I had to use array of hashes.

    my_hash_static = {:header =>{:company => 'xx', :usercode => 'xx', :password => 'xx',
                      :type=> 'n:n', :msgheader => from}, :body=>[]}
    my_hash_dynamic = {:mp=>{:msg=>message, :no=>phones} }        
    my_hash_full = my_hash_static[:body].push my_hash_dynamic

List of encodings that Node.js supports

The list of encodings that node supports natively is rather short:

  • ascii
  • base64
  • hex
  • ucs2/ucs-2/utf16le/utf-16le
  • utf8/utf-8
  • binary/latin1 (ISO8859-1, latin1 only in node 6.4.0+)

If you are using an older version than 6.4.0, or don't want to deal with non-Unicode encodings, you can recode the string:

Use iconv-lite to recode files:

var iconvlite = require('iconv-lite');
var fs = require('fs');

function readFileSync_encoding(filename, encoding) {
    var content = fs.readFileSync(filename);
    return iconvlite.decode(content, encoding);
}

Alternatively, use iconv:

var Iconv = require('iconv').Iconv;
var fs = require('fs');

function readFileSync_encoding(filename, encoding) {
    var content = fs.readFileSync(filename);
    var iconv = new Iconv(encoding, 'UTF-8');
    var buffer = iconv.convert(content);
    return buffer.toString('utf8');
}

Max size of an iOS application

Please be aware that the warning on iTunes Connect does not say anything about the limit being only for over-the-air delivery. It would be preferable if the warning mentioned this.

enter image description here

MySQL show status - active or total connections?

According to the docs, it means the total number throughout history:

Connections

The number of connection attempts (successful or not) to the MySQL server.

You can see the number of active connections either through the Threads_connected status variable:

Threads_connected

The number of currently open connections.

mysql> show status where `variable_name` = 'Threads_connected';
+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| Threads_connected | 4     |
+-------------------+-------+
1 row in set (0.00 sec)

... or through the show processlist command:

mysql> show processlist;
+----+------+-----------------+--------+---------+------+-------+------------------+
| Id | User | Host            | db     | Command | Time | State | Info             |
+----+------+-----------------+--------+---------+------+-------+------------------+
|  3 | root | localhost       | webapp | Query   |    0 | NULL  | show processlist | 
|  5 | root | localhost:61704 | webapp | Sleep   |  208 |       | NULL             | 
|  6 | root | localhost:61705 | webapp | Sleep   |  208 |       | NULL             | 
|  7 | root | localhost:61706 | webapp | Sleep   |  208 |       | NULL             | 
+----+------+-----------------+--------+---------+------+-------+------------------+
4 rows in set (0.00 sec)

Angular - POST uploaded file

your http service file:

import { Injectable } from "@angular/core";
import { ActivatedRoute, Router } from '@angular/router';
import { Http, Headers, Response, Request, RequestMethod, URLSearchParams, RequestOptions } from "@angular/http";
import {Observable} from 'rxjs/Rx';
import { Constants } from './constants';
declare var $: any;

@Injectable()
export class HttpClient {
  requestUrl: string;
  responseData: any;
  handleError: any;

  constructor(private router: Router, 
  private http: Http, 
  private constants: Constants, 
  ) {
    this.http = http;
  }

  postWithFile (url: string, postData: any, files: File[]) {

    let headers = new Headers();
    let formData:FormData = new FormData();
    formData.append('files', files[0], files[0].name);
    // For multiple files
    // for (let i = 0; i < files.length; i++) {
    //     formData.append(`files[]`, files[i], files[i].name);
    // }

    if(postData !=="" && postData !== undefined && postData !==null){
      for (var property in postData) {
          if (postData.hasOwnProperty(property)) {
              formData.append(property, postData[property]);
          }
      }
    }
    var returnReponse = new Promise((resolve, reject) => {
      this.http.post(this.constants.root_dir + url, formData, {
        headers: headers
      }).subscribe(
          res => {
            this.responseData = res.json();
            resolve(this.responseData);
          },
          error => {
            this.router.navigate(['/login']);
            reject(error);
          }
      );
    });
    return returnReponse;
  }
}

call your function (Component file):

onChange(event) {
    let file = event.srcElement.files;
    let postData = {field1:"field1", field2:"field2"}; // Put your form data variable. This is only example.
    this._service.postWithFile(this.baseUrl + "add-update",postData,file).then(result => {
        console.log(result);
    });
}

your html code:

<input type="file" class="form-control" name="documents" (change)="onChange($event)" [(ngModel)]="stock.documents" #documents="ngModel">

What is the difference between precision and scale?

Precision is the number of significant digits. Oracle guarantees the portability of numbers with precision ranging from 1 to 38.

Scale is the number of digits to the right (positive) or left (negative) of the decimal point. The scale can range from -84 to 127.

In your case, ID with precision 6 means it won't accept a number with 7 or more significant digits.

Reference:

http://download.oracle.com/docs/cd/B28359_01/server.111/b28318/datatype.htm#CNCPT1832

That page also has some examples that will make you understand precision and scale.

How to find out what is locking my tables?

This should give you all the details of the existing locks.

DECLARE @tblVariable TABLE(SPID INT, Status VARCHAR(200), [Login] VARCHAR(200), HostName VARCHAR(200), 
    BlkBy VARCHAR(200), DBName VARCHAR(200), Command VARCHAR(200), CPUTime INT, 
    DiskIO INT, LastBatch VARCHAR(200), ProgramName VARCHAR(200), _SPID INT, 
    RequestID INT)

INSERT INTO @tblVariable
EXEC Master.dbo.sp_who2

SELECT v.*, t.TEXT 
FROM @tblVariable v
INNER JOIN sys.sysprocesses sp ON sp.spid = v.SPID
CROSS APPLY sys.dm_exec_sql_text(sp.sql_handle) AS t
ORDER BY BlkBy DESC, CPUTime DESC

You can then kill, with caution, the SPID that blocks your table.

kill 104 -- Your SPID

Check if a Windows service exists and delete in PowerShell

Adapted this to take an input list of servers, specify a hostname and give some helpful output

            $name = "<ServiceName>"
            $servers = Get-content servers.txt

            function Confirm-WindowsServiceExists($name)
            {   
                if (Get-Service -Name $name -Computername $server -ErrorAction Continue)
                {
                    Write-Host "$name Exists on $server"
                    return $true
                }
                    Write-Host "$name does not exist on $server"
                    return $false
            }

            function Remove-WindowsServiceIfItExists($name)
            {   
                $exists = Confirm-WindowsServiceExists $name
                if ($exists)
                {    
                    Write-host "Removing Service $name from $server"
                    sc.exe \\$server delete $name
                }       
            }

            ForEach ($server in $servers) {Remove-WindowsServiceIfItExists($name)}

What precisely does 'Run as administrator' do?

So ... more digging, with the result. It seems that although I ran one process normal and one "As Administrator", I had UAC off. Turning UAC to medium allowed me to see different results. Basically, it all boils down to integrity levels, which are 5.

Browsers, for example, run at Low Level (1), while services (System user) run at System Level (4). Everything is very well explained in Windows Integrity Mechanism Design . When UAC is enabled, processes are created with Medium level (SID S-1-16-8192 AKA 0x2000 is added) while when "Run as Administrator", the process is created with High Level (SID S-1-16-12288 aka 0x3000).

So the correct ACCESS_TOKEN for a normal user (Medium Integrity level) is:

0:000:x86> !token
Thread is not impersonating. Using process token...
TS Session ID: 0x1
User: S-1-5-21-1542574918-171588570-488469355-1000
Groups:
 00 S-1-5-21-1542574918-171588570-488469355-513
    Attributes - Mandatory Default Enabled
 01 S-1-1-0
    Attributes - Mandatory Default Enabled
 02 S-1-5-32-544
    Attributes - DenyOnly
 03 S-1-5-32-545
    Attributes - Mandatory Default Enabled
 04 S-1-5-4
    Attributes - Mandatory Default Enabled
 05 S-1-2-1
    Attributes - Mandatory Default Enabled
 06 S-1-5-11
    Attributes - Mandatory Default Enabled
 07 S-1-5-15
    Attributes - Mandatory Default Enabled
 08 S-1-5-5-0-1908477
    Attributes - Mandatory Default Enabled LogonId
 09 S-1-2-0
    Attributes - Mandatory Default Enabled
 10 S-1-5-64-10
    Attributes - Mandatory Default Enabled
 11 S-1-16-8192
    Attributes - GroupIntegrity GroupIntegrityEnabled
Primary Group:   LocadDumpSid failed to dump Sid at addr 000000000266b458, 0xC0000078; try own SID dump.
s-1-0x515000000
Privs:
 00 0x000000013 SeShutdownPrivilege               Attributes -
 01 0x000000017 SeChangeNotifyPrivilege           Attributes - Enabled Default
 02 0x000000019 SeUndockPrivilege                 Attributes -
 03 0x000000021 SeIncreaseWorkingSetPrivilege     Attributes -
 04 0x000000022 SeTimeZonePrivilege               Attributes -
Auth ID: 0:1d1f65
Impersonation Level: Anonymous
TokenType: Primary
Is restricted token: no.

Now, the differences are as follows:

S-1-5-32-544
Attributes - Mandatory Default Enabled Owner

for "As Admin", while

S-1-5-32-544
Attributes - DenyOnly

for non-admin.

Note that S-1-5-32-544 is BUILTIN\Administrators. Also, there are fewer privileges, and the most important thing to notice:

admin:

S-1-16-12288
Attributes - GroupIntegrity GroupIntegrityEnabled

while for non-admin:

S-1-16-8192
Attributes - GroupIntegrity GroupIntegrityEnabled

I hope this helps.

Further reading: http://www.blackfishsoftware.com/blog/don/creating_processes_sessions_integrity_levels

Encoding URL query parameters in Java

java.net.URLEncoder.encode(String s, String encoding) can help too. It follows the HTML form encoding application/x-www-form-urlencoded.

URLEncoder.encode(query, "UTF-8");

On the other hand, Percent-encoding (also known as URL encoding) encodes space with %20. Colon is a reserved character, so : will still remain a colon, after encoding.

Perform an action in every sub-directory using Bash

the accepted answer will break on white spaces if the directory names have them, and the preferred syntax is $() for bash/ksh. Use GNU find -exec option with +; eg

find .... -exec mycommand +; #this is same as passing to xargs

or use a while loop

find .... | while read -r D
do
    # use variable `D` or whatever variable name you defined instead here
done 

How to secure an ASP.NET Web API

Web API introduced an Attribute [Authorize] to provide security. This can be set globally (global.asx)

public static void Register(HttpConfiguration config)
{
    config.Filters.Add(new AuthorizeAttribute());
}

Or per controller:

[Authorize]
public class ValuesController : ApiController{
...

Of course your type of authentication may vary and you may want to perform your own authentication, when this occurs you may find useful inheriting from Authorizate Attribute and extending it to meet your requirements:

public class DemoAuthorizeAttribute : AuthorizeAttribute
{
    public override void OnAuthorization(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        if (Authorize(actionContext))
        {
            return;
        }
        HandleUnauthorizedRequest(actionContext);
    }

    protected override void HandleUnauthorizedRequest(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        var challengeMessage = new System.Net.Http.HttpResponseMessage(System.Net.HttpStatusCode.Unauthorized);
        challengeMessage.Headers.Add("WWW-Authenticate", "Basic");
        throw new HttpResponseException(challengeMessage);
    }

    private bool Authorize(System.Web.Http.Controllers.HttpActionContext actionContext)
    {
        try
        {
            var someCode = (from h in actionContext.Request.Headers where h.Key == "demo" select h.Value.First()).FirstOrDefault();
            return someCode == "myCode";
        }
        catch (Exception)
        {
            return false;
        }
    }
}

And in your controller:

[DemoAuthorize]
public class ValuesController : ApiController{

Here is a link on other custom implemenation for WebApi Authorizations:

http://www.piotrwalat.net/basic-http-authentication-in-asp-net-web-api-using-membership-provider/

Visual studio code CSS indentation and formatting

Yes, try installing vscode-css-formatter extension.
It just adds the functionality to format .css files and the shortcut stays the same Alt+Shift+F.

How to run multiple DOS commands in parallel?

You can execute commands in parallel with start like this:

start "" ping myserver
start "" nslookup myserver
start "" morecommands

They will each start in their own command prompt and allow you to run multiple commands at the same time from one batch file.

Hope this helps!

Fastest way to count number of occurrences in a Python list

You can convert list in string with elements seperated by space and split it based on number/char to be searched..

Will be clean and fast for large list..

>>>L = [2,1,1,2,1,3]
>>>strL = " ".join(str(x) for x in L)
>>>strL
2 1 1 2 1 3
>>>count=len(strL.split(" 1"))-1
>>>count
3

What are the differences between json and simplejson Python modules?

I came across this question as I was looking to install simplejson for Python 2.6. I needed to use the 'object_pairs_hook' of json.load() in order to load a json file as an OrderedDict. Being familiar with more recent versions of Python I didn't realize that the json module for Python 2.6 doesn't include the 'object_pairs_hook' so I had to install simplejson for this purpose. From personal experience this is why i use simplejson as opposed to the standard json module.

Finding absolute value of a number without using Math.abs()

Like this:

if (number < 0) {
    number *= -1;
}

how to set radio option checked onload with jQuery

//If you are doing it on javascript or a framework like backbone, you will encounter this a lot you could have something like this

$MobileRadio = $( '#mobileUrlRadio' );

while

$MobileRadio.checked = true;

will not work,

$MobileRadio[0].checked = true;

will.

your selector can be as the other guys above recommended too.

Getting error: ISO C++ forbids declaration of with no type

Your declaration is int ttTreeInsert(int value);

However, your definition/implementation is

ttTree::ttTreeInsert(int value)
{
}

Notice that the return type int is missing in the implementation. Instead it should be

int ttTree::ttTreeInsert(int value)
{
    return 1; // or some valid int
}

Event binding on dynamically created elements?

You can add events to objects when you create them. If you are adding the same events to multiple objects at different times, creating a named function might be the way to go.

var mouseOverHandler = function() {
    // Do stuff
};
var mouseOutHandler = function () {
    // Do stuff
};

$(function() {
    // On the document load, apply to existing elements
    $('select').hover(mouseOverHandler, mouseOutHandler);
});

// This next part would be in the callback from your Ajax call
$("<select></select>")
    .append( /* Your <option>s */ )
    .hover(mouseOverHandler, mouseOutHandler)
    .appendTo( /* Wherever you need the select box */ )
;

Which comes first in a 2D array, rows or columns?

In c++ (distant, dusty memory) I think it was a little easier to look at the code and understand arrays than it is in Java sometimes. Both are row major. This illustration worked for me in helping to understand.

Given this code for a 2d array of strings...

    String[][] messages; 
    messages = new String[][] {
        {"CAT","DOG","YIN","BLACK","HIGH","DAY"},
        {"kitten","puppy","yang","white","low","night"} 
    };
    
    int row = messages.length;
    int col = messages[0].length;
    

Naming my ints as if it were a 2d array (row, col) we see the values.

row = (int) 2
col = (int) 6

The last two lines of code, where we try to determine size and set them to row and col does not look all that intuitive and its not necessarily right.

What youre really dealing with here is this (note new variable names to illustrate):

int numOfArraysIn = messages.length;
int numOfElementsIn0 = messages[0].length;
int numOfElementsIn1 = messages[1].length;

Where messages.length tells you messages holds two arrays. An array of arrays.

AND then messages[x].length yields the size of each of the individual arrays 0 1 inside messages.

numOfArraysIn = (int) 2
numOfElementsIn0 = (int) 6
numOfElementsIn1 = (int) 6

When we print with a for each loop....

for (String str : messages[0])
        System.out.print(str);
for (String str : messages[1])
        System.out.print(str);

CATDOGYINBLACKHIGHDAYkittenpuppyyangwhitelownight

Trying to drop the brackets and print like this gives an error

for (String str : messages)
        System.out.print(str);

incompatible types: String[] cannot be converted to String

The above is important to understand while setting up loops that use .length to limit the step thru the array.

How do you pull first 100 characters of a string in PHP

$small = substr($big, 0, 100);

For String Manipulation here is a page with a lot of function that might help you in your future work.

bash string equality

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

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

Calling a user defined function in jQuery

$(document).ready(function() {
  $('#btnSun').click(function(){

      myFunction();

   });

   $.fn.myFunction = function() { 
     alert('hi'); 

    }; 
});

Put ' ; ' after function definition...

Goal Seek Macro with Goal as a Formula

I think your issue is that Range("H18") doesn't contain a formula. Also, you could make your code more efficient by eliminating x. Instead, change your code to

Range("H18").GoalSeek Goal:=Range("H32").Value, ChangingCell:=Range("G18")

Can overridden methods differ in return type?

well, the answer is yes... AND NO.

depends on the question. everybody here answered regarding Java >= 5, and some mentioned that Java < 5 does not feature covariant return types.

actually, the Java language spec >= 5 supports it, but the Java runtime does not. in particular, the JVM was not updated to support covariant return types.

in what was seen then as a "clever" move but ended up being one of the worst design decisions in Java's history, Java 5 implemented a bunch of new language features without modifying the JVM or the classfile spec at all. instead all features were implemented with trickery in javac: the compiler generates/uses plain classes for nested/inner classes, type erasure and casts for generics, synthetic accessors for nested/inner class private "friendship", synthetic instance fields for outer 'this' pointers, synthetic static fields for '.class' literals, etc, etc.

and covariant return types is yet more syntactic sugar added by javac.

for example, when compiling this:

class Base {
  Object get() { return null; }
}

class Derived extends Base {
  @Override
  @SomeAnnotation
  Integer get() { return null; }
}

javac will output two get methods in the Derived class:

Integer Integer:Derived:get() { return null; }
synthetic bridge Object Object:Derived:get() { return Integer:Derived:get(); }

the generated bridge method (marked synthetic and bridge in bytecode) is what actually overrides Object:Base:get() because, to the JVM, methods with different return types are completely independent and cannot override each other. to provide the expected behavior, the bridge simply calls your "real" method. in the example above, javac will annotate both bridge and real methods in Derived with @SomeAnnotation.

note that you cannot hand-code this solution in Java < 5, because bridge and real methods only differ in return type and thus they cannot coexist in a Java program. but in the JVM world, method return types are part of the method signature (just like their arguments) and so the two methods named the same and taking the same arguments are nonetheless seen as completely independent by the JVM due to their differing return types, and can coexist.

(BTW, the types of fields are similarly part of the field signature in bytecode, so it is legal to have several fields of different types but named the same within a single bytecode class.)

so to answer your question fully: the JVM does not support covariant return types, but javac >= 5 fakes it at compile time with a coating of sweet syntactic sugar.

How to change the height of a <br>?

Another way is to use an HR. But, and here's the cunning part, make it invisible.

Thus:

<hr style="height:30pt; visibility:hidden;" />

To make a cleaner BR break simulated using the HR: Btw works in all browsers!!

{ height:2px; visibility:hidden; margin-bottom:-1px; }

QR Code encoding and decoding using zxing

Maybe worth looking at QRGen, which is built on top of ZXing and supports UTF-8 with this kind of syntax:

// if using special characters don't forget to supply the encoding
VCard johnSpecial = new VCard("Jöhn D?e")
                        .setAdress("ëåäö? Sträät 1, 1234 Döestüwn");
QRCode.from(johnSpecial).withCharset("UTF-8").file();

How to customize the configuration file of the official PostgreSQL Docker image?

I looked through all answers and there is another option left. You can change your CMD value in docker file (it is not the best one, but still possible way to achieve your goal).

Basically we need to

  • Copy config file in docker container
  • Override postgres start options

Docker file example:

FROM postgres:9.6
USER postgres

# Copy postgres config file into container
COPY postgresql.conf /etc/postgresql

# Override default postgres config file
CMD ["postgres", "-c", "config_file=/etc/postgresql/postgresql.conf"]

Though I think using command: postgres -c config_file=/etc/postgresql/postgresql.confin your docker-compose.yml file proposed by Matthias Braun is the best option.

Difference between ref and out parameters in .NET

ref and out both allow the called method to modify a parameter. The difference between them is what happens before you make the call.

  • ref means that the parameter has a value on it before going into the function. The called function can read and or change the value any time. The parameter goes in, then comes out

  • out means that the parameter has no official value before going into the function. The called function must initialize it. The parameter only goes out

Here's my favorite way to look at it: ref is to pass variables by reference. out is to declare a secondary return value for the function. It's like if you could write this:

// This is not C#
public (bool, string) GetWebThing(string name, ref Buffer paramBuffer);

// This is C#
public bool GetWebThing(string name, ref Buffer paramBuffer, out string actualUrl);

Here's a more detailed list of the effects of each alternative:

Before calling the method:

ref: The caller must set the value of the parameter before passing it to the called method.

out: The caller method is not required to set the value of the argument before calling the method. Most likely, you shouldn't. In fact, any current value is discarded.

During the call:

ref: The called method can read the argument at any time.

out: The called method must initialize the parameter before reading it.

Remoted calls:

ref: The current value is marshalled to the remote call. Extra performance cost.

out: Nothing is passed to the remote call. Faster.

Technically speaking, you could use always ref in place of out, but out allows you to be more precise about the meaning of the argument, and sometimes it can be a lot more efficient.

How to assert greater than using JUnit Assert?

You can put it like this

  assertTrue("your fail message ",Long.parseLong(previousTokenValues[1]) > Long.parseLong(currentTokenValues[1]));

Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v

You have broken version of RVM. Ubuntu does something to RVM that produces lots of errors, the only safe way of fixing for now is to:

sudo apt-get --purge remove ruby-rvm
sudo rm -rf /usr/share/ruby-rvm /etc/rvmrc /etc/profile.d/rvm.sh

open new terminal and validate environment is clean from old RVM settings (should be no output):

env | grep rvm

if there was output, try to open new terminal, if it does not help then restart your computer.

install RVM:

\curl -L https://get.rvm.io | 
  bash -s stable --ruby --autolibs=enable --auto-dotfiles

If you find you need some hand-holding, take a look at Installing Ruby on Ubuntu 12.04, which gives a bit more explanation.

Revert a jQuery draggable object back to its original container on out event of droppable

It's related about revert origin : to set origin when the object is drag : just use $(this).data("draggable").originalPosition = {top:0, left:0};

For example : i use like this

               drag: function() {
                    var t = $(this);
                    left = parseInt(t.css("left")) * -1;
                    if(left > 0 ){
                        left = 0;
                        t.draggable( "option", "revert", true );
                        $(this).data("draggable").originalPosition = {top:0, left:0};
                    } 
                    else t.draggable( "option", "revert", false );

                    $(".slider-work").css("left",  left);
                }

List and kill at jobs on UNIX

at -l to list jobs, which gives return like this:

age2%> at -l
11      2014-10-21 10:11 a hoppent
10      2014-10-19 13:28 a hoppent

atrm 10 kills job 10

Or so my sysadmin told me, and it

Cross field validation with Hibernate Validator (JSR 303)

I suggest you another possible solution. Perhaps less elegant, but easier!

public class MyBean {
  @Size(min=6, max=50)
  private String pass;

  private String passVerify;

  @AssertTrue(message="passVerify field should be equal than pass field")
  private boolean isValid() {
    return this.pass.equals(this.passVerify);
  }
}

The isValid method is invoked by the validator automatically.

How to fix "Only one expression can be specified in the select list when the subquery is not introduced with EXISTS" error?

Try this:

 Select 
    Id, 
    Salt, 
    Password, 
    BannedEndDate, 
    (Select Count(*) 
        From LoginFails 
        Where username = '" + LoginModel.Username + "' And IP = '" + Request.ServerVariables["REMOTE_ADDR"] + "')
 From Users 
 Where username = '" + LoginModel.Username + "'

And I recommend you strongly to use parameters in your query to avoid security risks with sql injection attacks!

Hope that helps!

How do I change the database name using MySQL?

InnoDB supports RENAME TABLE statement to move table from one database to another. To use it programmatically and rename database with large number of tables, I wrote a couple of procedures to get the job done. You can check it out here - SQL script @Gist

To use it simply call the renameDatabase procedure.

CALL renameDatabase('old_name', 'new_name');

Tested on MariaDB and should work ideally on all RDBMS using InnoDB transactional engine.

Making interface implementations async

An abstract class can be used instead of an interface (in C# 7.3).

// Like interface
abstract class IIO
{
    public virtual async Task<string> DoOperation(string Name)
    {
        throw new NotImplementedException(); // throwing exception
        // return await Task.Run(() => { return ""; }); // or empty do
    }
}

// Implementation
class IOImplementation : IIO
{
    public override async Task<string> DoOperation(string Name)
    {
        return await await Task.Run(() =>
        {
            if(Name == "Spiderman")
                return "ok";
            return "cancel";
        }); 
    }
}

What is log4j's default log file dumping path

You have copy this sample code from Here,right?
now, as you can see there property file they have define, have you done same thing? if not then add below code in your project with property file for log4j

So the content of log4j.properties file would be as follows:

# Define the root logger with appender file
log = /usr/home/log4j
log4j.rootLogger = DEBUG, FILE

# Define the file appender
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.FILE.File=${log}/log.out

# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%m%n

make changes as per your requirement like log path

Wait for async task to finish

This will never work, because the JS VM has moved on from that async_call and returned the value, which you haven't set yet.

Don't try to fight what is natural and built-in the language behaviour. You should use a callback technique or a promise.

function f(input, callback) {
    var value;

    // Assume the async call always succeed
    async_call(input, function(result) { callback(result) };

}

The other option is to use a promise, have a look at Q. This way you return a promise, and then you attach a then listener to it, which is basically the same as a callback. When the promise resolves, the then will trigger.

How do I remove lines between ListViews on Android?

   <ListView xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/list"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:divider="@null"
  android:dividerHeight="0dp"/>

What tools do you use to test your public REST API?

http://www.quadrillian.com/ this enables you to create an entire test suite for your API and run it from your browser and share it with others.

matching query does not exist Error in Django

You can use this in your case, it will work fine.

user = UniversityDetails.objects.filter(email=email).first()

CSS: how do I create a gap between rows in a table?

the padding in the TD works if you want the space to have the same background color as the td

in my case, requirement was for white space between header row and whatever was above it

by applying this styling to a single cell, i was able to get the desired separation. It was not necessary to add it to all cells... Arguably not the MOST elegant, but possibly more elegant than separator rows.

<td colspan="10"> 
    <div class="HeaderRow" 
         style="margin-top:10px;">
            <%# Eval("VendorName")%>
     </div>
</td>  

Creating a new dictionary in Python

You can do this

x = {}
x['a'] = 1

When should I use git pull --rebase?

You should use git pull --rebase when

  • your changes do not deserve a separate branch

Indeed -- why not then? It's more clear, and doesn't impose a logical grouping on your commits.


Ok, I suppose it needs some clarification. In Git, as you probably know, you're encouraged to branch and merge. Your local branch, into which you pull changes, and remote branch are, actually, different branches, and git pull is about merging them. It's reasonable, since you push not very often and usually accumulate a number of changes before they constitute a completed feature.

However, sometimes--by whatever reason--you think that it would actually be better if these two--remote and local--were one branch. Like in SVN. It is here where git pull --rebase comes into play. You no longer merge--you actually commit on top of the remote branch. That's what it actually is about.

Whether it's dangerous or not is the question of whether you are treating local and remote branch as one inseparable thing. Sometimes it's reasonable (when your changes are small, or if you're at the beginning of a robust development, when important changes are brought in by small commits). Sometimes it's not (when you'd normally create another branch, but you were too lazy to do that). But that's a different question.

Add key value pair to all objects in array

Simply you can add that way. see below the console image

enter image description here

How do I increase the RAM and set up host-only networking in Vagrant?

You can easily increase your VM's RAM by modifying the memory property of config.vm.provider section in your vagrant file.

config.vm.provider "virtualbox" do |vb|
 vb.memory = "4096"
end

This allocates about 4GB of RAM to your VM. You can change this according to your requirement. For example, following setting would allocate 2GB of RAM to your VM.

config.vm.provider "virtualbox" do |vb|
 vb.memory = "2048"
end

Try removing the config.vm.customize ["modifyvm", :id, "--memory", 1024] in your file, and adding the above code.

For the network configuration, try modifying the config.vm.network :hostonly, "199.188.44.20" in your file toconfig.vm.network "private_network", ip: "199.188.44.20"

Downloading images with node.js

This is an extension to Cezary's answer. If you want to download it to a specific directory, use this. Also, use const instead of var. Its safe this way.

const fs = require('fs');
const request = require('request');
var download = function(uri, filename, callback){
  request.head(uri, function(err, res, body){    
    request(uri).pipe(fs.createWriteStream(filename)).on('close', callback);
  });
};

download('https://www.google.com/images/srpr/logo3w.png', './images/google.png', function(){
  console.log('done');
});

Call to undefined function oci_connect()

Download from Instant Client for Microsoft Windows (x64) and extract the files below to "c:\oracle":

instantclient-basic-windows.x64-12.1.0.2.0.zip

instantclient-sqlplus-windows.x64-12.1.0.2.0.zip

instantclient-sdk-windows.x64-12.1.0.2.0.zip This will create the following folder "C:\Oracle\instantclient_12_1".

Finally, add the "C:\Oracle\instantclient_12_1" folder to the PATH enviroment variable, placing it on the leftmost place.

Then Restart your server.

How to break a while loop from an if condition inside the while loop?

An "if" is not a loop. Just use the break inside the "if" and it will break out of the "while".

If you ever need to use genuine nested loops, Java has the concept of a labeled break. You can put a label before a loop, and then use the name of the label is the argument to break. It will break outside of the labeled loop.

How do I detect "shift+enter" and generate a new line in Textarea?

This works for me!

$("#your_textarea").on('keydown', function(e){
    if(e.keyCode === 13 && !e.shiftKey) 
    {

          $('form').submit();

    }
});

How do I write a bash script to restart a process if it dies?

Have a look at monit (http://mmonit.com/monit/). It handles start, stop and restart of your script and can do health checks plus restarts if necessary.

Or do a simple script:

while true
do
/your/script
sleep 1
done

How to change line-ending settings

For me what did the trick was running the command

git config auto.crlf false

inside the folder of the project, I wanted it specifically for one project.

That command changed the file in path {project_name}/.git/config (fyi .git is a hidden folder) by adding the lines

[auto]
    crlf = false

at the end of the file. I suppose changing the file does the same trick as well.

Get the data received in a Flask request

If the body is recognized as form data, it will be in request.form. If it's JSON, it will be in request.get_json(). Otherwise the raw data will be in request.data. If you're not sure how data will be submitted, you can use an or chain to get the first one with data.

def get_request_data():
    return (
        request.args
        or request.form
        or request.get_json(force=True, silent=True)
        or request.data
    )

request.args contains args parsed from the query string, regardless of what was in the body, so you would remove that from get_request_data() if both it and a body should data at the same time.

WCF on IIS8; *.svc handler mapping doesn't work

using PowerShell you can install the required feature with:

Add-WindowsFeature 'NET-HTTP-Activation'

Problem in running .net framework 4.0 website on iis 7.0

If you look in the ISAPI And CGI Restrictions, and everything is already set to Allowed, and the ASP.NET installed is v4.0.30319, then in the right, at the "Actions" panel click in the "Edit Feature Settings..." and check both boxes. In my case, they were not.

How to swap two variables in JavaScript

In ES6 now there is destructuring assignment and you can do:

let a = 1;
let b = 2;
[b, a] = [a, b]  // a = 2, b = 1

Regular Expression - 2 letters and 2 numbers in C#

Just for fun, here's a non-regex (more readable/maintainable for simpletons like me) solution:

string myString = "AB12";

if( Char.IsLetter(myString, 0) && 
    Char.IsLetter(myString, 1) && 
    Char.IsNumber(myString, 2) &&
    Char.IsNumber(myString, 3)) {
    // First two are letters, second two are numbers
}
else {
    // Validation failed
}

EDIT

It seems that I've misunderstood the requirements. The code below will ensure that the first two characters and last two characters of a string validate (so long as the length of the string is > 3)

string myString = "AB12";

if(myString.Length > 3) {    
    if( Char.IsLetter(myString, 0) && 
        Char.IsLetter(myString, 1) && 
        Char.IsNumber(myString, (myString.Length - 2)) &&
        Char.IsNumber(myString, (myString.Length - 1))) {
        // First two are letters, second two are numbers
      }
      else {
        // Validation failed
    }
}
else {
   // Validation failed
}

Set icon for Android application

You can simply install an Android studio Martial icons plugin its name is please check plugin URL Material Design Icon Generator and check this GIF for more details:

Android studio icons plugin

This is mainly for creating the icons with required sizes, and it will be located directly in its folders.

How can I format bytes a cell in Excel as KB, MB, GB etc?

After seeing the answers here just improved on this formula to have decimal places on bigger values and cater for negative values.

=IF(A1<999500000000,TEXT(A1,"#,##.#0,,,"" TB"""),
IF(A1<-9995000000,TEXT(A1,"#,##.#0,,,"" GB"""),
IF(A1<-9995000,TEXT(A1,"#,##0,,"" MB"""),
IF(A1<-9995,TEXT(A1,"#,##0,"" KB"""),
IF(A1<-1000,TEXT(A1,"#,##0"" B """),
IF(A1<0,TEXT(A1,"#,##0"" B """),
IF(A1<1000,TEXT(A1,"#,##0"" B """),
IF(A1<999500,TEXT(A1,"#,##0,"" KB"""),
IF(A1<999500000,TEXT(A1,"#,##0,,"" MB"""),
IF(A1<999500000000,TEXT(A1,"#,##.#0,,,"" GB"""),
TEXT(A1,"#,##.#0,,,,"" TB""")))))))))))

assign headers based on existing row in dataframe in R

The cleanest way is use a function of janitor package that is built for exactly this purpose.

janitor::row_to_names(DF,1)

If you want to use any other row than the first one, pass it in the second parameter.

HTML5 Audio stop function

As a side note and because I was recently using the stop method provided in the accepted answer, according to this link:

https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Media_events

by setting currentTime manually one may fire the 'canplaythrough' event on the audio element. In the link it mentions Firefox, but I encountered this event firing after setting currentTime manually on Chrome. So if you have behavior attached to this event you might end up in an audio loop.

Where can I download IntelliJ IDEA Color Schemes?

If you're just looking for a dark color scheme for IntelliJ IDEA, this is the first link I get in a Google search:

Dark Pastels theme for IntelliJ IDEA Dark Pastels theme for IntelliJ IDEA

Of course, you can tweak either of these two schemes to your satisfaction. Don't feel like you have to stick to the fonts and the colors that the original authors have chosen. We programmers don't get nearly enough change to try our hand at interior decorating to pass up this opportunity.

Is there any reason these won't work in the version you have? As best I can tell, you can simply import any theme that you want.

Simulating a click in jQuery/JavaScript on a link

Easy! Just use jQuery's click function:

$("#theElement").click();

How to check if a table is locked in sql server

You can use the sys.dm_tran_locks view, which returns information about the currently active lock manager resources.

Try this

 SELECT 
     SessionID = s.Session_id,
     resource_type,   
     DatabaseName = DB_NAME(resource_database_id),
     request_mode,
     request_type,
     login_time,
     host_name,
     program_name,
     client_interface_name,
     login_name,
     nt_domain,
     nt_user_name,
     s.status,
     last_request_start_time,
     last_request_end_time,
     s.logical_reads,
     s.reads,
     request_status,
     request_owner_type,
     objectid,
     dbid,
     a.number,
     a.encrypted ,
     a.blocking_session_id,
     a.text       
 FROM   
     sys.dm_tran_locks l
     JOIN sys.dm_exec_sessions s ON l.request_session_id = s.session_id
     LEFT JOIN   
     (
         SELECT  *
         FROM    sys.dm_exec_requests r
         CROSS APPLY sys.dm_exec_sql_text(sql_handle)
     ) a ON s.session_id = a.session_id
 WHERE  
     s.session_id > 50

SQL JOIN - WHERE clause vs. ON clause

The way I do it is:

  • Always put the join conditions in the ON clause if you are doing an INNER JOIN. So, do not add any WHERE conditions to the ON clause, put them in the WHERE clause.

  • If you are doing a LEFT JOIN, add any WHERE conditions to the ON clause for the table in the right side of the join. This is a must, because adding a WHERE clause that references the right side of the join will convert the join to an INNER JOIN.

    The exception is when you are looking for the records that are not in a particular table. You would add the reference to a unique identifier (that is not ever NULL) in the RIGHT JOIN table to the WHERE clause this way: WHERE t2.idfield IS NULL. So, the only time you should reference a table on the right side of the join is to find those records which are not in the table.

Dropping connected users in Oracle database

Sometimes Oracle drop user takes long time to execute. In that case user might be connected to the database. Better you can kill user session and drop the user.

SQL> select 'alter system kill session ''' || sid || ',' || serial# || ''' immediate;' from v$session where username ='&USERNAME';

SQL> DROP USER barbie CASCADE;

Align nav-items to right side in bootstrap-4

Here and easy Example.

<!-- Navigation bar-->

<nav class="navbar navbar-toggleable-md bg-info navbar-inverse">
    <div class="container">
        <button class="navbar-toggler" data-toggle="collapse" data-target="#mainMenu">
            <span class="navbar-toggler-icon"></span>
            </button>
        <div class="collapse navbar-collapse" id="mainMenu">
            <div class="navbar-nav ml-auto " style="width:100%">
                <a class="nav-item nav-link active" href="#">Home</a>
                <a class="nav-item nav-link" href="#">About</a>
                <a class="nav-item nav-link" href="#">Training</a>
                <a class="nav-item nav-link" href="#">Contact</a>
            </div>
        </div>
    </div>
</nav>

Concatenating string and integer in python

if you only want to print yo can do this:

print(s , i)

Make a URL-encoded POST request using `http.NewRequest(...)`

URL-encoded payload must be provided on the body parameter of the http.NewRequest(method, urlStr string, body io.Reader) method, as a type that implements io.Reader interface.

Based on the sample code:

package main

import (
    "fmt"
    "net/http"
    "net/url"
    "strconv"
    "strings"
)

func main() {
    apiUrl := "https://api.com"
    resource := "/user/"
    data := url.Values{}
    data.Set("name", "foo")
    data.Set("surname", "bar")

    u, _ := url.ParseRequestURI(apiUrl)
    u.Path = resource
    urlStr := u.String() // "https://api.com/user/"

    client := &http.Client{}
    r, _ := http.NewRequest(http.MethodPost, urlStr, strings.NewReader(data.Encode())) // URL-encoded payload
    r.Header.Add("Authorization", "auth_token=\"XXXXXXX\"")
    r.Header.Add("Content-Type", "application/x-www-form-urlencoded")
    r.Header.Add("Content-Length", strconv.Itoa(len(data.Encode())))

    resp, _ := client.Do(r)
    fmt.Println(resp.Status)
}

resp.Status is 200 OK this way.

error: RPC failed; curl transfer closed with outstanding read data remaining

This problem is solved 100%. I was facing this problem , my project manager change the repo name but i was using old repo name.

Engineer@-Engi64 /g/xampp/htdocs/hospitality
$ git clone https://git-codecommit.us-east-2.amazonaws.com/v1/repo/cms
Cloning into 'cms'...
remote: Counting objects: 10647, done.
error: RPC failed; curl 56 OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 10054
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed

How i solved this problem. Repo link was not valid so that's why i am facing this issue. Please check your repo link before cloning.

Python: Best way to add to sys.path relative to the current running script

Create a wrapper module project/bin/lib, which contains this:

import sys, os

sys.path.insert(0, os.path.join(
    os.path.dirname(os.path.dirname(os.path.realpath(__file__))), 'lib'))

import mylib

del sys.path[0], sys, os

Then you can replace all the cruft at the top of your scripts with:

#!/usr/bin/python
from lib import mylib

Python readlines() usage and efficient practice for reading

Read line by line, not the whole file:

for line in open(file_name, 'rb'):
    # process line here

Even better use with for automatically closing the file:

with open(file_name, 'rb') as f:
    for line in f:
        # process line here

The above will read the file object using an iterator, one line at a time.

git - pulling from specific branch

git-pull - Fetch from and integrate with another repository or a local branch

git pull [options] [<repository> [<refspec>...]]

You can refer official git doc https://git-scm.com/docs/git-pull

Ex :

git pull origin dev

jQuery select by attribute using AND and OR operators

Simple use .filter() [docs] (AND) using the multiple selector [docs] (OR):

$('[myc="blue"]').filter('[myid="1"],[myid="2"]');

In general, chaining selectors, like a.foo.bar[attr=value] is some kind of AND selector.

jQuery has extensive documentation about the supported selectors, it's worth a read.

How to style a div to have a background color for the entire width of the content, and not just for the width of the display?

.success { background-color: #cffccc; overflow: scroll; min-width: 100%; }

You can try scroll or auto.

SyntaxError: missing ; before statement

Looks like you have an extra parenthesis.

The following portion is parsed as an assignment so the interpreter/compiler will look for a semi-colon or attempt to insert one if certain conditions are met.

foob_name = $this.attr('name').replace(/\[(\d+)\]/, function($0, $1) {
   return '[' + (+$1 + 1) + ']';
})

How to get current moment in ISO 8601 format with date, hour, and minute?

If you don't want to include Jodatime (as nice as it is)

javax.xml.bind.DatatypeConverter.printDateTime(
    Calendar.getInstance(TimeZone.getTimeZone("UTC"))
);

which returns a string of:

2012-07-10T16:02:48.440Z

which is slightly different to the original request but is still ISO-8601.

How to inherit constructors?

public class BaseClass
{
    public BaseClass(params int[] parameters)
    {

    }   
}

public class ChildClass : BaseClass
{
    public ChildClass(params int[] parameters)
        : base(parameters)
    {

    }
}

Check if an element contains a class in JavaScript?

Here's a case-insensitive trivial solution:

function hasClass(element, classNameToTestFor) {
    var classNames = element.className.split(' ');
    for (var i = 0; i < classNames.length; i++) {
        if (classNames[i].toLowerCase() == classNameToTestFor.toLowerCase()) {
            return true;
        }
    }
    return false;
}

C++ compiling on Windows and Linux: ifdef switch

It depends on the compiler. If you compile with, say, G++ on Linux and VC++ on Windows, this will do :

#ifdef linux
    ...
#elif _WIN32
    ...
#else
    ...
#endif

How can I count the rows with data in an Excel sheet?

With formulas, what you can do is:

  • in a new column (say col D - cell D2), add =COUNTA(A2:C2)
  • drag this formula till the end of your data (say cell D4 in our example)
  • add a last formula to sum it up (e.g in cell D5): =SUM(D2:D4)

Get string character by index - Java

You want .charAt()

Here's a tutorial

"mystring".charAt(2)

returns s

If you're hellbent on having a string there are a couple of ways to convert a char to a string:

String mychar = Character.toString("mystring".charAt(2));

Or

String mychar = ""+"mystring".charAt(2);

Or even

String mychar = String.valueOf("mystring".charAt(2));

For example.

Disabled form inputs do not appear in the request

Simple workaround - just use hidden field as placeholder for select, checkbox and radio.

From this code to -

<form action="/Media/Add">
    <input type="hidden" name="Id" value="123" />

    <!-- this does not appear in request -->
    <input type="textbox" name="Percentage" value="100" disabled="disabled" /> 
    <select name="gender" disabled="disabled">
          <option value="male">Male</option>
          <option value="female" selected>Female</option>
    </select>

</form>

that code -

<form action="/Media/Add">
    <input type="hidden" name="Id" value="123" />

    <input type="textbox" value="100" readonly /> 

    <input type="hidden" name="gender" value="female" />
    <select name="gender" disabled="disabled">
          <option value="male">Male</option>
          <option value="female" selected>Female</option>
    </select>
</form>

Populate nested array in mongoose

I found this very helpful creating a feathersjs before hook to populate a 2 ref level deep relation. The mongoose models simply have

tables = new Schema({
  ..
  tableTypesB: { type: Schema.Types.ObjectId, ref: 'tableTypesB' },
  ..
}
tableTypesB = new Schema({
  ..
  tableType: { type: Schema.Types.ObjectId, ref: 'tableTypes' },
  ..
}

then in feathersjs before hook:

module.exports = function(options = {}) {
  return function populateTables(hook) {
    hook.params.query.$populate = {
      path: 'tableTypesB',
      populate: { path: 'tableType' }
    }

    return Promise.resolve(hook)
  }
}

So simple compared to some other methods I was trying to achieve this.

How to mute an html5 video player using jQuery

Are you using the default controls boolean attribute on the video tag? If so, I believe all the supporting browsers have mute buttons. If you need to wire it up, set .muted to true on the element in javascript (use .prop for jquery because it's an IDL attribute.) The speaker icon on the volume control is the mute button on chrome,ff, safari, and opera for example

JavaScript before leaving the page

Most of the solutions here did not work for me so I used the one found here

I also added a variable to allow the confirm box or not

window.hideWarning = false;
window.addEventListener('beforeunload', (event) => {
    if (!hideWarning) {
        event.preventDefault();
        event.returnValue = '';
    }

});

"Unicode Error "unicodeescape" codec can't decode bytes... Cannot open text files in Python 3

I had this same error in python 3.2.

I have script for email sending and:

csv.reader(open('work_dir\uslugi1.csv', newline='', encoding='utf-8'))

when I remove first char in file uslugi1.csv works fine.

Css transition from display none to display block, navigation with subnav

Generally when people are trying to animate display: none what they really want is:

  1. Fade content in, and
  2. Have the item not take up space in the document when hidden

Most popular answers use visibility, which can only achieve the first goal, but luckily it's just as easy to achieve both by using position.

Since position: absolute removes the element from typing document flow spacing, you can toggle between position: absolute and position: static (global default), combined with opacity. See the below example.

_x000D_
_x000D_
.content-page {_x000D_
  position:absolute;_x000D_
  opacity: 0;_x000D_
}_x000D_
_x000D_
.content-page.active {_x000D_
  position: static;_x000D_
  opacity: 1;_x000D_
  transition: opacity 1s linear;_x000D_
}
_x000D_
_x000D_
_x000D_

Remove element by id

You can directly remove that element by using remove() method of DOM.

here's an example:

let subsWrapper = document.getElementById("element_id");
subsWrapper.remove();
//OR directly.
document.getElementById("element_id").remove();

Write to Windows Application Event Log

This is the logger class that I use. The private Log() method has EventLog.WriteEntry() in it, which is how you actually write to the event log. I'm including all of this code here because it's handy. In addition to logging, this class will also make sure the message isn't too long to write to the event log (it will truncate the message). If the message was too long, you'd get an exception. The caller can also specify the source. If the caller doesn't, this class will get the source. Hope it helps.

By the way, you can get an ObjectDumper from the web. I didn't want to post all that here. I got mine from here: C:\Program Files (x86)\Microsoft Visual Studio 10.0\Samples\1033\CSharpSamples.zip\LinqSamples\ObjectDumper

using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Reflection;
using Xanico.Core.Utilities;

namespace Xanico.Core
{
    /// <summary>
    /// Logging operations
    /// </summary>
    public static class Logger
    {
        // Note: The actual limit is higher than this, but different Microsoft operating systems actually have
        //       different limits. So just use 30,000 to be safe.
        private const int MaxEventLogEntryLength = 30000;

        /// <summary>
        /// Gets or sets the source/caller. When logging, this logger class will attempt to get the
        /// name of the executing/entry assembly and use that as the source when writing to a log.
        /// In some cases, this class can't get the name of the executing assembly. This only seems
        /// to happen though when the caller is in a separate domain created by its caller. So,
        /// unless you're in that situation, there is no reason to set this. However, if there is
        /// any reason that the source isn't being correctly logged, just set it here when your
        /// process starts.
        /// </summary>
        public static string Source { get; set; }

        /// <summary>
        /// Logs the message, but only if debug logging is true.
        /// </summary>
        /// <param name="message">The message.</param>
        /// <param name="debugLoggingEnabled">if set to <c>true</c> [debug logging enabled].</param>
        /// <param name="source">The name of the app/process calling the logging method. If not provided,
        /// an attempt will be made to get the name of the calling process.</param>
        public static void LogDebug(string message, bool debugLoggingEnabled, string source = "")
        {
            if (debugLoggingEnabled == false) { return; }

            Log(message, EventLogEntryType.Information, source);
        }

        /// <summary>
        /// Logs the information.
        /// </summary>
        /// <param name="message">The message.</param>
        /// <param name="source">The name of the app/process calling the logging method. If not provided,
        /// an attempt will be made to get the name of the calling process.</param>
        public static void LogInformation(string message, string source = "")
        {
            Log(message, EventLogEntryType.Information, source);
        }

        /// <summary>
        /// Logs the warning.
        /// </summary>
        /// <param name="message">The message.</param>
        /// <param name="source">The name of the app/process calling the logging method. If not provided,
        /// an attempt will be made to get the name of the calling process.</param>
        public static void LogWarning(string message, string source = "")
        {
            Log(message, EventLogEntryType.Warning, source);
        }

        /// <summary>
        /// Logs the exception.
        /// </summary>
        /// <param name="ex">The ex.</param>
        /// <param name="source">The name of the app/process calling the logging method. If not provided,
        /// an attempt will be made to get the name of the calling process.</param>
        public static void LogException(Exception ex, string source = "")
        {
            if (ex == null) { throw new ArgumentNullException("ex"); }

            if (Environment.UserInteractive)
            {
                Console.WriteLine(ex.ToString());
            }

            Log(ex.ToString(), EventLogEntryType.Error, source);
        }

        /// <summary>
        /// Recursively gets the properties and values of an object and dumps that to the log.
        /// </summary>
        /// <param name="theObject">The object to log</param>
        [SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters", MessageId = "Xanico.Core.Logger.Log(System.String,System.Diagnostics.EventLogEntryType,System.String)")]
        [SuppressMessage("Microsoft.Naming", "CA1720:IdentifiersShouldNotContainTypeNames", MessageId = "object")]
        public static void LogObjectDump(object theObject, string objectName, string source = "")
        {
            const int objectDepth = 5;
            string objectDump = ObjectDumper.GetObjectDump(theObject, objectDepth);

            string prefix = string.Format(CultureInfo.CurrentCulture,
                                          "{0} object dump:{1}",
                                          objectName,
                                          Environment.NewLine);

            Log(prefix + objectDump, EventLogEntryType.Warning, source);
        }

        private static void Log(string message, EventLogEntryType entryType, string source)
        {
            // Note: I got an error that the security log was inaccessible. To get around it, I ran the app as administrator
            //       just once, then I could run it from within VS.

            if (string.IsNullOrWhiteSpace(source))
            {
                source = GetSource();
            }

            string possiblyTruncatedMessage = EnsureLogMessageLimit(message);
            EventLog.WriteEntry(source, possiblyTruncatedMessage, entryType);

            // If we're running a console app, also write the message to the console window.
            if (Environment.UserInteractive)
            {
                Console.WriteLine(message);
            }
        }

        private static string GetSource()
        {
            // If the caller has explicitly set a source value, just use it.
            if (!string.IsNullOrWhiteSpace(Source)) { return Source; }

            try
            {
                var assembly = Assembly.GetEntryAssembly();

                // GetEntryAssembly() can return null when called in the context of a unit test project.
                // That can also happen when called from an app hosted in IIS, or even a windows service.

                if (assembly == null)
                {
                    assembly = Assembly.GetExecutingAssembly();
                }


                if (assembly == null)
                {
                    // From http://stackoverflow.com/a/14165787/279516:
                    assembly = new StackTrace().GetFrames().Last().GetMethod().Module.Assembly;
                }

                if (assembly == null) { return "Unknown"; }

                return assembly.GetName().Name;
            }
            catch
            {
                return "Unknown";
            }
        }

        // Ensures that the log message entry text length does not exceed the event log viewer maximum length of 32766 characters.
        private static string EnsureLogMessageLimit(string logMessage)
        {
            if (logMessage.Length > MaxEventLogEntryLength)
            {
                string truncateWarningText = string.Format(CultureInfo.CurrentCulture, "... | Log Message Truncated [ Limit: {0} ]", MaxEventLogEntryLength);

                // Set the message to the max minus enough room to add the truncate warning.
                logMessage = logMessage.Substring(0, MaxEventLogEntryLength - truncateWarningText.Length);

                logMessage = string.Format(CultureInfo.CurrentCulture, "{0}{1}", logMessage, truncateWarningText);
            }

            return logMessage;
        }
    }
}

Using Pairs or 2-tuples in Java

I don't think there is a general purpose tuple class in Java but a custom one might be as easy as the following:

public class Tuple<X, Y> { 
  public final X x; 
  public final Y y; 
  public Tuple(X x, Y y) { 
    this.x = x; 
    this.y = y; 
  } 
} 

Of course, there are some important implications of how to design this class further regarding equality, immutability, etc., especially if you plan to use instances as keys for hashing.

String contains another two strings

With the code d.Contains(b + a) you check if "You hit someone for 50 damage" contains "someonedamage". And this (i guess) you don't want.

The + concats the two string of b and a.

You have to check it by

if(d.Contains(b) && d.Contains(a))

Are there dictionaries in php?

Associative array in PHP actually considered as a dictionary.

An array in PHP is actually an ordered map. A map is a type that associates values to keys. it can be treated as an array, list (vector), hash table (an implementation of a map), dictionary, collection, stack, queue, and probably more.

<?php
$array = array(
    "foo" => "bar",
    "bar" => "foo",
);

// Using the short array syntax
$array = [
    "foo" => "bar",
    "bar" => "foo",
];
?>

An array is different than a dictionary in that arrays have both an index and a key. Dictionaries only have keys and no index.

Node.js res.setHeader('content-type', 'text/javascript'); pushing the response javascript as file download

You can directly set the content type like below:

res.writeHead(200, {'Content-Type': 'text/plain'});

For reference go through the nodejs Docs link.

Collapse all methods in Visual Studio Code

Like this ? (Visual Studio Code version 0.10.11)

Fold All (Ctrl+K Ctrl+0)

Unfold All (Ctrl+K Ctrl+J)

Fold Level n (Ctrl+K Ctrl+N)

Jenkins: Failed to connect to repository

This is a very tricky issue - even if you're familiar with how things are working in https with certificates (OTOH if you see my workaround, it seems very logical :)

If you want to connect to a GIT repository via http(s) from shell, you would make sure to have the public certificate stored (as file) on your machine. Then you would add that certificate to your GIT configuration

git config [--global] http.sslCAInfo "certificate"

(replace "certificate" with the complete path/name of the PEM file :)

For shell usage you would as well e.g. supply a '.netrc' provding your credentials for the http-server login. Having done that, you shall be able to do a 'git clone https://...' without any interactive provisioning of credentials.

However, for the Jenkins-service it's a bit different ... Here, the jenkins process needs to be aware of the server certificate - and it doesn't use the shell settings (in the meaning of the global git configuration file '.gitconfig') :P

What I needed to do is to add another parameter to the startup options of Jenkins.

... -Djavax.net.ssl.trustStore="keystore" ...

(replace "keystore" with the complete path/name like explained below :)

Now copy the keystore file of your webserver holding the certificate to some path (I know this is a dirty hack and not exactly secure :) and refer to it with the '-Djavax.net.ssl.trustStore=' parameter.

Now the Jenkins service will accept the certificate from the webserver providing the repository via https. Configure the GIT repository URL like

https://yourserver.com/your-repositorypath

Note that you still require the '.netrc' under the jenkins-user home folder for the logon !!! Thus what I describe is to be seen as a workaround ... until a properly working credentials helper plugin is provided. IMHO this plugin (in its current version 1.9.4) is buggy.

I could never get the credentials-helper to work from Jenkins no matter what I tried :( At best I got to see some errors about the not accessible temporary credential helper file, etc. You can see lots of bugs reported about it in the Jenkins JIRA, but no fix.

So if somebody got it to work okay, please share the knowledge ...


P.S.: Using the Jenkins plugins in the following versions:

Credentials plugin 1.9.4, GIT client plugin 1.6.1, Jenkins GIT plugin 2.0.1

AttributeError: 'str' object has no attribute

The problem is in your playerMovement method. You are creating the string name of your room variables (ID1, ID2, ID3):

letsago = "ID" + str(self.dirDesc.values())

However, what you create is just a str. It is not the variable. Plus, I do not think it is doing what you think its doing:

>>>str({'a':1}.values())
'dict_values([1])'

If you REALLY needed to find the variable this way, you could use the eval function:

>>>foo = 'Hello World!'
>>>eval('foo')
'Hello World!'

or the globals function:

class Foo(object):
    def __init__(self):
        super(Foo, self).__init__()
    def test(self, name):
        print(globals()[name])

foo = Foo()
bar = 'Hello World!'
foo.text('bar')

However, instead I would strongly recommend you rethink you class(es). Your userInterface class is essentially a Room. It shouldn't handle player movement. This should be within another class, maybe GameManager or something like that.

How do I unload (reload) a Python module?

I got a lot of trouble trying to reload something inside Sublime Text, but finally I could wrote this utility to reload modules on Sublime Text based on the code sublime_plugin.py uses to reload modules.

This below accepts you to reload modules from paths with spaces on their names, then later after reloading you can just import as you usually do.

def reload_module(full_module_name):
    """
        Assuming the folder `full_module_name` is a folder inside some
        folder on the python sys.path, for example, sys.path as `C:/`, and
        you are inside the folder `C:/Path With Spaces` on the file 
        `C:/Path With Spaces/main.py` and want to re-import some files on
        the folder `C:/Path With Spaces/tests`

        @param full_module_name   the relative full path to the module file
                                  you want to reload from a folder on the
                                  python `sys.path`
    """
    import imp
    import sys
    import importlib

    if full_module_name in sys.modules:
        module_object = sys.modules[full_module_name]
        module_object = imp.reload( module_object )

    else:
        importlib.import_module( full_module_name )

def run_tests():
    print( "\n\n" )
    reload_module( "Path With Spaces.tests.semantic_linefeed_unit_tests" )
    reload_module( "Path With Spaces.tests.semantic_linefeed_manual_tests" )

    from .tests import semantic_linefeed_unit_tests
    from .tests import semantic_linefeed_manual_tests

    semantic_linefeed_unit_tests.run_unit_tests()
    semantic_linefeed_manual_tests.run_manual_tests()

if __name__ == "__main__":
    run_tests()

If you run for the first time, this should load the module, but if later you can again the method/function run_tests() it will reload the tests files. With Sublime Text (Python 3.3.6) this happens a lot because its interpreter never closes (unless you restart Sublime Text, i.e., the Python3.3 interpreter).

How do I base64 encode a string efficiently using Excel VBA?

As Mark C points out, you can use the MSXML Base64 encoding functionality as described here.

I prefer late binding because it's easier to deploy, so here's the same function that will work without any VBA references:

Function EncodeBase64(text As String) As String
  Dim arrData() As Byte
  arrData = StrConv(text, vbFromUnicode)

  Dim objXML As Variant
  Dim objNode As Variant

  Set objXML = CreateObject("MSXML2.DOMDocument")
  Set objNode = objXML.createElement("b64")

  objNode.dataType = "bin.base64"
  objNode.nodeTypedValue = arrData
  EncodeBase64 = objNode.text

  Set objNode = Nothing
  Set objXML = Nothing
End Function

Plot a line graph, error in xy.coords(x, y, xlabel, ylabel, log) : 'x' and 'y' lengths differ

plot(t) is in this case the same as

plot(t[[1]], t[[2]])

As the error message says, x and y differ in length and that is because you plot a list with length 4 against 1:

> length(t)
[1] 4
> length(1)
[1] 1

In your second example you plot a list with elements named x and y, both vectors of length 2, so plot plots these two vectors.

Edit:

If you want to plot lines use

plot(t, type="l")

How to install JRE 1.7 on Mac OS X and use it with Eclipse?

Try editing your eclipse.ini file and add the following at the top

-vm
/Library/Java/JavaVirtualMachines/jdk1.7.0_09.jdk/Contents/Home

Of course the path may be slightly different, looks like I have an older version...

I'm not sure if it will add itself automatically. If not go into

Preferences --> Java --> Installed JREs

Click Add and follow the instructions there to add it

How to handle windows file upload using Selenium WebDriver?

There is a simpler way to solve this then what Slanec described. Hes solution works when you are using an English keyboard, if not you will have a hard time trying to "map" the key for special characters.

Instead of robot.keyPress and robot.keyRelease every single key you can use Toolkit to copy the String to the clipboard and then paste it.

    StringSelection s = new StringSelection("Path to the file");
    Toolkit.getDefaultToolkit().getSystemClipboard().setContents(s, null);
    Robot robot = new Robot();
    robot.keyPress(java.awt.event.KeyEvent.VK_ENTER);
    robot.keyRelease(java.awt.event.KeyEvent.VK_ENTER);
    robot.keyPress(java.awt.event.KeyEvent.VK_CONTROL);
    robot.keyPress(java.awt.event.KeyEvent.VK_V);
    robot.keyRelease(java.awt.event.KeyEvent.VK_CONTROL);
    Thread.sleep(3000);
    robot.keyPress(java.awt.event.KeyEvent.VK_ENTER);

Incorrect integer value: '' for column 'id' at row 1

This is because your data sending column type is integer and your are sending a string value to it.

So, the following way worked for me. Try with this one.

$insertQuery = "INSERT INTO workorders VALUES (
                    null,
                    '$priority',
                    '$requestType',
                    '$purchaseOrder',
                    '$nte',
                    '$jobSiteNumber'
                )";

Don't use 'null'. use it as null without single quotes.

How to declare an ArrayList with values?

The Guava library contains convenience methods for creating lists and other collections which makes this much prettier than using the standard library classes.

Example:

ArrayList<String> list = newArrayList("a", "b", "c");

(This assumes import static com.google.common.collect.Lists.newArrayList;)

How to remove element from ArrayList by checking its value?

Use a iterator to loop through list and then delete the required object.

    Iterator itr = a.iterator();
    while(itr.hasNext()){
        if(itr.next().equals("acbd"))
            itr.remove();
    }

Capturing console output from a .NET application (C#)

This can be quite easily achieved using the ProcessStartInfo.RedirectStandardOutput property. A full sample is contained in the linked MSDN documentation; the only caveat is that you may have to redirect the standard error stream as well to see all output of your application.

Process compiler = new Process();
compiler.StartInfo.FileName = "csc.exe";
compiler.StartInfo.Arguments = "/r:System.dll /out:sample.exe stdstr.cs";
compiler.StartInfo.UseShellExecute = false;
compiler.StartInfo.RedirectStandardOutput = true;
compiler.Start();    

Console.WriteLine(compiler.StandardOutput.ReadToEnd());

compiler.WaitForExit();

What exactly does the "u" do? "git push -u origin master" vs "git push origin master"

git push -u origin master

… is the same as:

git push origin master ; git branch --set-upstream master origin/master

Do the last statement, if you forget the -u!

Or you could force it:

git config branch.master.remote origin
git config branch.master.merge refs/heads/master

If you let the command do it for you, it will pick your mistakes like if you typed a non-existent branch or you didn't git remote add; though that might be what you want. :)

ASP.NET MVC Custom Error Handling Application_Error Global.asax?

This may not be the best way for MVC ( https://stackoverflow.com/a/9461386/5869805 )

Below is how you render a view in Application_Error and write it to http response. You do not need to use redirect. This will prevent a second request to server, so the link in browser's address bar will stay same. This may be good or bad, it depends on what you want.

Global.asax.cs

protected void Application_Error()
{
    var exception = Server.GetLastError();
    // TODO do whatever you want with exception, such as logging, set errorMessage, etc.
    var errorMessage = "SOME FRIENDLY MESSAGE";

    // TODO: UPDATE BELOW FOUR PARAMETERS ACCORDING TO YOUR ERROR HANDLING ACTION
    var errorArea = "AREA";
    var errorController = "CONTROLLER";
    var errorAction = "ACTION";
    var pathToViewFile = $"~/Areas/{errorArea}/Views/{errorController}/{errorAction}.cshtml"; // THIS SHOULD BE THE PATH IN FILESYSTEM RELATIVE TO WHERE YOUR CSPROJ FILE IS!

    var requestControllerName = Convert.ToString(HttpContext.Current.Request.RequestContext?.RouteData?.Values["controller"]);
    var requestActionName = Convert.ToString(HttpContext.Current.Request.RequestContext?.RouteData?.Values["action"]);

    var controller = new BaseController(); // REPLACE THIS WITH YOUR BASE CONTROLLER CLASS
    var routeData = new RouteData { DataTokens = { { "area", errorArea } }, Values = { { "controller", errorController }, {"action", errorAction} } };
    var controllerContext = new ControllerContext(new HttpContextWrapper(HttpContext.Current), routeData, controller);
    controller.ControllerContext = controllerContext;

    var sw = new StringWriter();
    var razorView = new RazorView(controller.ControllerContext, pathToViewFile, "", false, null);
    var model = new ViewDataDictionary(new HandleErrorInfo(exception, requestControllerName, requestActionName));
    var viewContext = new ViewContext(controller.ControllerContext, razorView, model, new TempDataDictionary(), sw);
    viewContext.ViewBag.ErrorMessage = errorMessage;
    //TODO: add to ViewBag what you need
    razorView.Render(viewContext, sw);
    HttpContext.Current.Response.Write(sw);
    Server.ClearError();
    HttpContext.Current.Response.End(); // No more processing needed (ex: by default controller/action routing), flush the response out and raise EndRequest event.
}

View

@model HandleErrorInfo
@{
    ViewBag.Title = "Error";
    // TODO: SET YOUR LAYOUT
}
<div class="">
    ViewBag.ErrorMessage
</div>
@if(Model != null && HttpContext.Current.IsDebuggingEnabled)
{
    <div class="" style="background:khaki">
        <p>
            <b>Exception:</b> @Model.Exception.Message <br/>
            <b>Controller:</b> @Model.ControllerName <br/>
            <b>Action:</b> @Model.ActionName <br/>
        </p>
        <div>
            <pre>
                @Model.Exception.StackTrace
            </pre>
        </div>
    </div>
}

AngularJS sorting rows by table header

I'm just getting my feet wet with angular, but I found this great tutorial.
Here's a working plunk I put together with credit to Scott Allen and the above tutorial. Click search to display the sortable table.

For each column header you need to make it clickable - ng-click on a link will work. This will set the sortName of the column to sort.

<th>
     <a href="#" ng-click="sortName='name'; sortReverse = !sortReverse">
          <span ng-show="sortName == 'name' && sortReverse" class="glyphicon glyphicon-triangle-bottom"></span>
          <span ng-show="sortName == 'name' && !sortReverse" class="glyphicon glyphicon-triangle-top"></span>
           Name
     </a>
</th>

Then, in the table body you can pipe in that sortName in the orderBy filter orderBy:sortName:sortReverse

<tr ng-repeat="repo in repos | orderBy:sortName:sortReverse | filter:searchRepos">
     <td>{{repo.name}}</td>
     <td class="tag tag-primary">{{repo.stargazers_count | number}}</td>
     <td>{{repo.language}}</td>
</tr>

Creating a ZIP archive in memory using System.IO.Compression

You need to finish writing the memory stream then read the buffer back.

        using (var memoryStream = new MemoryStream())
        {
            using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create))
            {
                var demoFile = archive.CreateEntry("foo.txt");

                using (var entryStream = demoFile.Open())
                using (var streamWriter = new StreamWriter(entryStream))
                {
                    streamWriter.Write("Bar!");
                }
            }

            using (var fileStream = new FileStream(@"C:\Temp\test.zip", FileMode.Create))
            {
                var bytes = memoryStream.GetBuffer();
                fileStream.Write(bytes,0,bytes.Length );
            }
        }

Loading a properties file from Java package

The following two cases relate to loading a properties file from an example class named TestLoadProperties.

Case 1: Loading the properties file using ClassLoader

InputStream inputStream = TestLoadProperties.class.getClassLoader()
                          .getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the root/src directory for successful loading.

Case 2: Loading the properties file without using ClassLoader

InputStream inputStream = getClass().getResourceAsStream("A.config");
properties.load(inputStream);

In this case the properties file must be in the same directory as the TestLoadProperties.class file for successful loading.

Note: TestLoadProperties.java and TestLoadProperties.class are two different files. The former, .java file, is usually found in a project's src/ directory, while the latter, .class file, is usually found in its bin/ directory.

Put byte array to JSON and vice versa

The typical way to send binary in json is to base64 encode it.

Java provides different ways to Base64 encode and decode a byte[]. One of these is DatatypeConverter.

Very simply

byte[] originalBytes = new byte[] { 1, 2, 3, 4, 5};
String base64Encoded = DatatypeConverter.printBase64Binary(originalBytes);
byte[] base64Decoded = DatatypeConverter.parseBase64Binary(base64Encoded);

You'll have to make this conversion depending on the json parser/generator library you use.

How to change Android usb connect mode to charge only?

I have been searching for this for ages on my CM 11 android phone, running kitkat.

Well.. finally I found it. It's hidden in a totally unintuitive location:

  1. Go to settings
  2. Go to storage
  3. Open the menu and choose USB computer connection

Here you can choose between Media Device (MTP), Camera (PTP) and Mass storage (UMS). Turn them all off to get it to charge only.

Sadly, if the option is not there, it is not supported by the phone. This seems to be the case for my HTC One (M7).

How can I know if Object is String type object?

 object instanceof Type

is true if the object is a Type or a subclass of Type

 object.getClass().equals(Type.class) 

is true only if the object is a Type

Adjust plot title (main) position

We can use title() function with negative line value to bring down the title.

See this example:

plot(1, 1)
title("Title", line = -2)

enter image description here

upgade python version using pip

pip is designed to upgrade python packages and not to upgrade python itself. pip shouldn't try to upgrade python when you ask it to do so.

Don't type pip install python but use an installer instead.

Effective method to hide email from spam bots

One easy solution is to use HTML entities instead of actual characters. For example, the "[email protected]" will be converted into :

<a href="&#109;&#97;&#105;&#108;&#116;&#111;&#58;&#109;&#101;&#64;&#101;&#120;&#97;&#109;&#112;&#108;&#101;&#46;&#99;&#111;&#109;">email me</A>

Better way to sum a property value in an array

From array of objects

function getSum(array, column)
  let values = array.map((item) => parseInt(item[column]) || 0)
  return values.reduce((a, b) => a + b)
}

foo = [
  { a: 1, b: "" },
  { a: null, b: 2 },
  { a: 1, b: 2 },
  { a: 1, b: 2 },
]

getSum(foo, a) == 3
getSum(foo, b) == 6

Float vs Decimal in ActiveRecord

I remember my CompSci professor saying never to use floats for currency.

The reason for that is how the IEEE specification defines floats in binary format. Basically, it stores sign, fraction and exponent to represent a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.

That's why there is a Decimal format. If you do this:

irb:001:0> "%.47f" % (1.0/10)
=> "0.10000000000000000555111512312578270211815834045" # not "0.1"!

whereas if you just do

irb:002:0> (1.0/10).to_s
=> "0.1" # the interprer rounds the number for you

So if you are dealing with small fractions, like compounding interests, or maybe even geolocation, I would highly recommend Decimal format, since in decimal format 1.0/10 is exactly 0.1.

However, it should be noted that despite being less accurate, floats are processed faster. Here's a benchmark:

require "benchmark" 
require "bigdecimal" 

d = BigDecimal.new(3) 
f = Float(3)

time_decimal = Benchmark.measure{ (1..10000000).each { |i| d * d } } 
time_float = Benchmark.measure{ (1..10000000).each { |i| f * f } }

puts time_decimal 
#=> 6.770960 seconds 
puts time_float 
#=> 0.988070 seconds

Answer

Use float when you don't care about precision too much. For example, some scientific simulations and calculations only need up to 3 or 4 significant digits. This is useful in trading off accuracy for speed. Since they don't need precision as much as speed, they would use float.

Use decimal if you are dealing with numbers that need to be precise and sum up to correct number (like compounding interests and money-related things). Remember: if you need precision, then you should always use decimal.

GROUP BY + CASE statement

For TSQL I like to encapsulate case statements in an outer apply. This prevents me from having to have the case statement written twice, allows reference to the case statement by alias in future joins and avoids the need for positional references.

select oa.day, 
model.name, 
attempt.type, 
oa.result
COUNT(*) MyCount 
FROM attempt attempt, prod_hw_id prod_hw_id, model model
WHERE time >= '2013-11-06 00:00:00'  
AND time < '2013-11-07 00:00:00'
AND attempt.hard_id = prod_hw_id.hard_id
AND prod_hw_id.model_id = model.model_id
OUTER APPLY (
    SELECT CURRENT_DATE-1 AS day,
     CASE WHEN attempt.result = 0 THEN 0 ELSE 1 END result
    ) oa    
group by oa.day, 
model.name, 
attempt.type, 
oa.result
order by model.name, attempt.type, oa.result;

How to get unique values in an array

Majority of the solutions above have a high run time complexity.

Here is the solution that uses reduce and can do the job in O(n) time.

_x000D_
_x000D_
Array.prototype.unique = Array.prototype.unique || function() {_x000D_
        var arr = [];_x000D_
 this.reduce(function (hash, num) {_x000D_
  if(typeof hash[num] === 'undefined') {_x000D_
   hash[num] = 1; _x000D_
   arr.push(num);_x000D_
  }_x000D_
  return hash;_x000D_
 }, {});_x000D_
 return arr;_x000D_
}_x000D_
    _x000D_
var myArr = [3,1,2,3,3,3];_x000D_
console.log(myArr.unique()); //[3,1,2];
_x000D_
_x000D_
_x000D_

Note:

This solution is not dependent on reduce. The idea is to create an object map and push unique ones into the array.

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

$.active returns the number of active Ajax requests.

More info here

Type or namespace name does not exist

I experienced the same errors. After I discovered my project had the wrong Assembly name (I copied files from a different project and the namespaces got a little confused), and changed it back, the project compiled nicely.