Programs & Examples On #Rmysql

An R package for interfacing with MySQL and MariaDB databases.

Spring Boot Multiple Datasource

Use multiple datasource or realizing the separation of reading & writing. you must have a knowledge of Class AbstractRoutingDataSource which support dynamic datasource choose.

Here is my datasource.yaml and I figure out how to resolve this case. You can refer to this project spring-boot + quartz. Hope this will help you.

dbServer:
  default: localhost:3306
  read: localhost:3306
  write: localhost:3306
datasource:
  default:
    type: com.zaxxer.hikari.HikariDataSource
    pool-name: default
    continue-on-error: false
    jdbc-url: jdbc:mysql://${dbServer.default}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
    username: root
    password: lh1234
    connection-timeout: 30000
    connection-test-query: SELECT 1
    maximum-pool-size: 5
    minimum-idle: 2
    idle-timeout: 600000
    destroy-method: shutdown
    auto-commit: false
  read:
    type: com.zaxxer.hikari.HikariDataSource
    pool-name: read
    continue-on-error: false
    jdbc-url: jdbc:mysql://${dbServer.read}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
    username: root
    password: lh1234
    connection-timeout: 30000
    connection-test-query: SELECT 1
    maximum-pool-size: 5
    minimum-idle: 2
    idle-timeout: 600000
    destroy-method: shutdown
    auto-commit: false
  write:
    type: com.zaxxer.hikari.HikariDataSource
    pool-name: write
    continue-on-error: false
    jdbc-url: jdbc:mysql://${dbServer.write}/schedule_job?useSSL=true&verifyServerCertificate=false&useUnicode=true&characterEncoding=utf8
    username: root
    password: lh1234
    connection-timeout: 30000
    connection-test-query: SELECT 1
    maximum-pool-size: 5
    minimum-idle: 2
    idle-timeout: 600000
    destroy-method: shutdown
    auto-commit: false

How to select a CRAN mirror in R

You should either get a window with a list of repositories or a text menu with some options. But if that is not appearing, you can always specify the mirror from where to download the packages yourself by using repos parameter. By doing that, R will not ask you anymore about the repository. Example:

install.packages('RMySQL', repos='http://cran.us.r-project.org')

Here you have a list of mirrors for R.

Reset push notification settings for app

The same tech note as refered to in the accepted answer (TN2265 - Troubleshooting Push Notifications) has since been updated with a solution for iOS 5 and above.

In short: create a backup and restore from it every time.

On iOS 5 and later, reset the push notifications permissions alert by restoring the device from a backup (r. 11450187). Here are the steps to do this efficiently:

  1. Use the Xcode Organizer to install your app on the device. The key is to install the app for the first time without running it.
  2. Use iTunes to back up the device.
  3. Run the app. The push notifications permissions alert will be presented.
  4. When you want to reset the push notifications permissions alert, restore the device from the backup you created in the first step.

How to get the mouse position without events (without moving the mouse)?

Riffing on @SuperNova's answer, here's an approach using ES6 classes that keeps the context for this correct in your callback:

_x000D_
_x000D_
class Mouse {_x000D_
  constructor() {_x000D_
    this.x = 0;_x000D_
    this.y = 0;_x000D_
    this.callbacks = {_x000D_
      mouseenter: [],_x000D_
      mousemove: [],_x000D_
    };_x000D_
  }_x000D_
_x000D_
  get xPos() {_x000D_
    return this.x;_x000D_
  }_x000D_
_x000D_
  get yPos() {_x000D_
    return this.y;_x000D_
  }_x000D_
_x000D_
  get position() {_x000D_
    return `${this.x},${this.y}`;_x000D_
  }_x000D_
_x000D_
  addListener(type, callback) {_x000D_
    document.addEventListener(type, this); // Pass `this` as the second arg to keep the context correct_x000D_
    this.callbacks[type].push(callback);_x000D_
  }_x000D_
_x000D_
  // `handleEvent` is part of the browser's `EventListener` API._x000D_
  // https://developer.mozilla.org/en-US/docs/Web/API/EventListener/handleEvent_x000D_
  handleEvent(event) {_x000D_
    const isMousemove = event.type === 'mousemove';_x000D_
    const isMouseenter = event.type === 'mouseenter';_x000D_
_x000D_
    if (isMousemove || isMouseenter) {_x000D_
      this.x = event.pageX;_x000D_
      this.y = event.pageY;_x000D_
    }_x000D_
_x000D_
    this.callbacks[event.type].forEach((callback) => {_x000D_
      callback();_x000D_
    });_x000D_
  }_x000D_
}_x000D_
_x000D_
const mouse = new Mouse();_x000D_
_x000D_
mouse.addListener('mouseenter', () => console.log('mouseenter', mouse.position));_x000D_
mouse.addListener('mousemove', () => console.log('mousemove A', mouse.position));_x000D_
mouse.addListener('mousemove', () => console.log('mousemove B', mouse.position));
_x000D_
_x000D_
_x000D_

Run PHP Task Asynchronously

If you don't want the full blown ActiveMQ, I recommend to consider RabbitMQ. RabbitMQ is lightweight messaging that uses the AMQP standard.

I recommend to also look into php-amqplib - a popular AMQP client library to access AMQP based message brokers.

Bootstrap: add margin/padding space between columns

In the otherside if you like to remove double padding between columns just add class "nogap" inside row

<div class="row nogap">
    <div class="text-center col-md-6">Widget 1</div>
    <div class="text-center col-md-6">Widget 2</div>
</div>

and create additional css class for it

.nogap > .col{ padding-left:7.5px; padding-right: 7.5px}
.nogap > .col:first-child{ padding-left: 15px; }
.nogap > .col:last-child{ padding-right: 15px; }

Thats it, check here: https://codepen.io/michal-lukasik/pen/xXvoYJ

How can I remove the "No file chosen" tooltip from a file input in Chrome?

Across all browsers and simple. this did it for me

_x000D_
_x000D_
$(function () {_x000D_
     $('input[type="file"]').change(function () {_x000D_
          if ($(this).val() != "") {_x000D_
                 $(this).css('color', '#333');_x000D_
          }else{_x000D_
                 $(this).css('color', 'transparent');_x000D_
          }_x000D_
     });_x000D_
})
_x000D_
input[type="file"]{_x000D_
    color: transparent;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
_x000D_
<input type="file" name="app_cvupload" class="fullwidth input rqd">
_x000D_
_x000D_
_x000D_

Difference between "git add -A" and "git add ."

Git Version 1.x

Command New Files Modified Files Deleted Files Description
git add -A ?? ?? ?? Stage all (new, modified, deleted) files
git add . ?? ?? ? Stage new and modified files only in current folder
git add -u ? ?? ?? Stage modified and deleted files only

Git Version 2.x

Command New Files Modified Files Deleted Files Description
git add -A ?? ?? ?? Stage all (new, modified, deleted) files
git add . ?? ?? ?? Stage all (new, modified, deleted) files in current folder
git add --ignore-removal . ?? ?? ? Stage new and modified files only
git add -u ? ?? ?? Stage modified and deleted files only

Long-form flags:

  • git add -A is equivalent to git add --all
  • git add -u is equivalent to git add --update

Further reading:

fatal error LNK1104: cannot open file 'libboost_system-vc110-mt-gd-1_51.lib'

b2 -j%cores% toolset=%msvcver% address-model=64 architecture=x86 link=static threading=multi runtime-link=shared --build-type=minimal stage --stagedir=stage/x64

Properties ? Linker ? General ? Additional Library Directories $(BOOST)\stage\x64\lib

How to calculate date difference in JavaScript?

var d1=new Date(2011,0,1); // jan,1 2011
var d2=new Date(); // now

var diff=d2-d1,sign=diff<0?-1:1,milliseconds,seconds,minutes,hours,days;
diff/=sign; // or diff=Math.abs(diff);
diff=(diff-(milliseconds=diff%1000))/1000;
diff=(diff-(seconds=diff%60))/60;
diff=(diff-(minutes=diff%60))/60;
days=(diff-(hours=diff%24))/24;

console.info(sign===1?"Elapsed: ":"Remains: ",
             days+" days, ",
             hours+" hours, ",
             minutes+" minutes, ",
             seconds+" seconds, ",
             milliseconds+" milliseconds.");

Bind event to right mouse click

document.oncontextmenu = function() {return false;}; //disable the browser context menu
$('selector-name')[0].oncontextmenu = function(){} //set jquery element context menu 

Twitter Bootstrap Button Text Word Wrap

Try this: add white-space: normal; to the style definition of the Bootstrap Button or you can replace the code you displayed with the one below

<div class="col-lg-3"> <!-- FIRST COL -->
  <div class="panel panel-default">
    <div class="panel-body"> 
    <h4>Posted on</h4>
    <p>22nd September 2013</p>
    <h4>Tags</h4>
    <a href="#" class="btn btn-primary btn-xs col-lg-12" style="margin-bottom:4px;white-space: normal;">Lorem ipsum dolor sit amet, consectetur adipiscing elit.</a>
   <a href="#" class="btn btn-primary btn-xs col-lg-12" style="margin-bottom:4px;white-space: normal;">Lorem ipsum dolor sit amet, consectetur adipiscing elit.</a>
   <a href="#" class="btn btn-primary btn-xs col-lg-12" style="margin-bottom:4px;white-space: normal;">Lorem ipsum dolor sit amet, consectetur adipiscing elit.</a>
           </div>
  </div>
</div>

I have updated your fiddle here to show how it comes out.

What is default session timeout in ASP.NET?

The Default Expiration Period for Session is 20 Minutes.

You can update sessionstate and configure the minutes under timeout

<sessionState 
timeout="30">
</sessionState>

How can I hide select options with JavaScript? (Cross browser)

Three years late, but my Googling brought me here so hopefully my answer will be useful for someone else.

I just created a second option (which I hid with CSS) and used Javascript to move the s backwards and forwards between them.

<select multiple id="sel1">
  <option class="set1">Blah</option>
</select>
<select multiple id="sel2" style="display:none">
  <option class="set2">Bleh</option>
</select>

Something like that, and then something like this will move an item onto the list (i.e., make it visible). Obviously adapt the code as needed for your purpose.

$('#sel2 .set2').appendTo($('#sel1'))

Superscript in Python plots

If you want to write unit per meter (m^-1), use $m^{-1}$), which means -1 inbetween {}

Example: plt.ylabel("Specific Storage Values ($m^{-1}$)", fontsize = 12 )

Find html label associated with a given input

$("label[for='inputId']").text()

This helped me to get the label of an input element using its ID.

Check if not nil and not empty in Rails shortcut?

There's a method that does this for you:

def show
  @city = @user.city.present?
end

The present? method tests for not-nil plus has content. Empty strings, strings consisting of spaces or tabs, are considered not present.

Since this pattern is so common there's even a shortcut in ActiveRecord:

def show
  @city = @user.city?
end

This is roughly equivalent.

As a note, testing vs nil is almost always redundant. There are only two logically false values in Ruby: nil and false. Unless it's possible for a variable to be literal false, this would be sufficient:

if (variable)
  # ...
end

This is preferable to the usual if (!variable.nil?) or if (variable != nil) stuff that shows up occasionally. Ruby tends to wards a more reductionist type of expression.

One reason you'd want to compare vs. nil is if you have a tri-state variable that can be true, false or nil and you need to distinguish between the last two states.

What is the difference between min SDK version/target SDK version vs. compile SDK version?

compileSdkVersion : The compileSdkVersion is the version of the API the app is compiled against. This means you can use Android API features included in that version of the API (as well as all previous versions, obviously). If you try and use API 16 features but set compileSdkVersion to 15, you will get a compilation error. If you set compileSdkVersion to 16 you can still run the app on a API 15 device.

minSdkVersion : The min sdk version is the minimum version of the Android operating system required to run your application.

targetSdkVersion : The target sdk version is the version your app is targeted to run on.

private final static attribute vs private final attribute

Here is my two cents:

final           String CENT_1 = new Random().nextInt(2) == 0 ? "HEADS" : "TAILS";
final   static  String CENT_2 = new Random().nextInt(2) == 0 ? "HEADS" : "TAILS";

Example:

package test;

public class Test {

    final long OBJECT_ID = new Random().nextLong();
    final static long CLASSS_ID = new Random().nextLong();

    public static void main(String[] args) {
        Test[] test = new Test[5];
        for (int i = 0; i < test.length; i++){
            test[i] = new Test();
            System.out.println("Class id: "+test[i].CLASSS_ID);//<- Always the same value
            System.out.println("Object id: "+test[i].OBJECT_ID);//<- Always different
        }
    }
}

The key is that variables and functions can return different values.Therefore final variables can be assigned with different values.

How to export a Vagrant virtual machine to transfer it

You have two ways to do this, I'll call it dirty way and clean way:

1. The dirty way

Create a box from your current virtual environment, using vagrant package command:

http://docs.vagrantup.com/v2/cli/package.html

Then copy the box to the other pc, add it using vagrant box add and run it using vagrant up as usual.

Keep in mind that files in your working directory (the one with the Vagrantfile) are shared when the virtual machine boots, so you need to copy it to the other pc as well.

2. The clean way

Theoretically it should never be necessary to do export/import with Vagrant. If you have the foresight to use provisioning for configuring the virtual environment (chef, puppet, ansible), and a version control system like git for your working directory, copying an environment would be at this point simple as running:

git clone <your_repo>
vagrant up

Getting A File's Mime Type In Java

Because there's so many answers linking to libraries, or non-portable code; I thought I'd share an alternative way by simply checking the magic bytes of the stream or file that you want to know the type of, as I've shown here : https://stackoverflow.com/a/65667558/3225638

It uses native java, but requires you to define in the enum the types you would want to handle/detect beforehand, but you'd only have to do it once.

Kotlin - How to correctly concatenate a String

I agree with the accepted answer above but it is only good for known string values. For dynamic string values here is my suggestion.

// A list may come from an API JSON like
{
   "names": [
      "Person 1",
      "Person 2",
      "Person 3",
         ...
      "Person N"
   ]
}
var listOfNames = mutableListOf<String>() 

val stringOfNames = listOfNames.joinToString(", ") 
// ", " <- a separator for the strings, could be any string that you want

// Posible result
// Person 1, Person 2, Person 3, ..., Person N

This is useful for concatenating list of strings with separator.

Python Function to test ping

This is my version of check ping function. May be if well be usefull for someone:

def check_ping(host):
if platform.system().lower() == "windows":
response = os.system("ping -n 1 -w 500 " + host + " > nul")
if response == 0:
return "alive"
else:
return "not alive"
else:
response = os.system("ping -c 1 -W 0.5" + host + "> /dev/null")
if response == 1:
return "alive"
else:
return "not alive"

Does Eclipse have line-wrap

The Eclipse Word-Wrap plugin works for any type of file for me.

Add a new line to the end of a JtextArea

Are you using JTextArea's append(String) method to add additional text?

JTextArea txtArea = new JTextArea("Hello, World\n", 20, 20);
txtArea.append("Goodbye Cruel World\n");

How can I recover a lost commit in Git?

git reflog is your friend. Find the commit that you want to be on in that list and you can reset to it (for example:git reset --hard e870e41).

(If you didn't commit your changes... you might be in trouble - commit early, and commit often!)

using setTimeout on promise chain

.then(() => new Promise((resolve) => setTimeout(resolve, 15000)))

UPDATE:

when I need sleep in async function I throw in

await new Promise(resolve => setTimeout(resolve, 1000))

Very Long If Statement in Python

According to PEP8, long lines should be placed in parentheses. When using parentheses, the lines can be broken up without using backslashes. You should also try to put the line break after boolean operators.

Further to this, if you're using a code style check such as pycodestyle, the next logical line needs to have different indentation to your code block.

For example:

if (abcdefghijklmnopqrstuvwxyz > some_other_long_identifier and
        here_is_another_long_identifier != and_finally_another_long_name):
    # ... your code here ...
    pass

how to pass this element to javascript onclick function and add a class to that clicked element

Use this html to get the clicked element:

<div class="row" style="padding-left:21px;">
    <ul class="nav nav-tabs" style="padding-left:40px;">
        <li class="active filter"><a href="#month" onclick="Data('month', this)">This Month</a></li>
        <li class="filter"><a href="#year" onclick="Data('year', this)">Year</a></li>
        <li class="filter"><a href="#last60" onclick="Data('last60', this)">60 Days</a></li>
        <li class="filter"><a href="#last90" onclick="Data('last90', this)">90 Days</a></li>
    </ul> 
</div>

Script:

 function Data(string, el)
 {
     $('.filter').removeClass('active');
     $(el).parent().addClass('active');
 } 

Conversion between UTF-8 ArrayBuffer and String

The main problem of programmers looking for conversion from byte array into a string is UTF-8 encoding (compression) of unicode characters. This code will help you:

var getString = function (strBytes) {

    var MAX_SIZE = 0x4000;
    var codeUnits = [];
    var highSurrogate;
    var lowSurrogate;
    var index = -1;

    var result = '';

    while (++index < strBytes.length) {
        var codePoint = Number(strBytes[index]);

        if (codePoint === (codePoint & 0x7F)) {

        } else if (0xF0 === (codePoint & 0xF0)) {
            codePoint ^= 0xF0;
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
        } else if (0xE0 === (codePoint & 0xE0)) {
            codePoint ^= 0xE0;
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
        } else if (0xC0 === (codePoint & 0xC0)) {
            codePoint ^= 0xC0;
            codePoint = (codePoint << 6) | (strBytes[++index] ^ 0x80);
        }

        if (!isFinite(codePoint) || codePoint < 0 || codePoint > 0x10FFFF || Math.floor(codePoint) != codePoint)
            throw RangeError('Invalid code point: ' + codePoint);

        if (codePoint <= 0xFFFF)
            codeUnits.push(codePoint);
        else {
            codePoint -= 0x10000;
            highSurrogate = (codePoint >> 10) | 0xD800;
            lowSurrogate = (codePoint % 0x400) | 0xDC00;
            codeUnits.push(highSurrogate, lowSurrogate);
        }
        if (index + 1 == strBytes.length || codeUnits.length > MAX_SIZE) {
            result += String.fromCharCode.apply(null, codeUnits);
            codeUnits.length = 0;
        }
    }

    return result;
}

All the best !

CSS display:table-row does not expand when width is set to 100%

Note that according to the CSS3 spec, you do NOT have to wrap your layout in a table-style element. The browser will infer the existence of containing elements if they do not exist.

iPhone app could not be installed at this time

I was also having this problem, with an Ad-Hoc iPad application, when trying to install it on a iOS 6 device.

What fixed it for me was to click on the project in XCode, and change the "iOS Deployment Target" setting from 5.1 to 6.0.

And there was silly me thinking that iOS 5.1 apps would run on a iOS 6.0 device.

Richtextbox wpf binding

Why not just use a FlowDocumentScrollViewer ?

How to find whether or not a variable is empty in Bash?

if [ ${foo:+1} ]
then
    echo "yes"
fi

prints yes if the variable is set. ${foo:+1} will return 1 when the variable is set, otherwise it will return empty string.

jQuery animate scroll

You can animate the scrolltop of the page with jQuery.

$('html, body').animate({
    scrollTop: $(".middle").offset().top
 }, 2000);

See this site: http://papermashup.com/jquery-page-scrolling/

How to initialise memory with new operator in C++?

If the memory you are allocating is a class with a constructor that does something useful, the operator new will call that constructor and leave your object initialized.

But if you're allocating a POD or something that doesn't have a constructor that initializes the object's state, then you cannot allocate memory and initialize that memory with operator new in one operation. However, you have several options:

  1. Use a stack variable instead. You can allocate and default-initialize in one step, like this:

     int vals[100] = {0}; // first element is a matter of style
    
  2. use memset(). Note that if the object you are allocating is not a POD, memsetting it is a bad idea. One specific example is if you memset a class that has virtual functions, you will blow away the vtable and leave your object in an unusable state.

  3. Many operating systems have calls that do what you want - allocate on a heap and initialize the data to something. A Windows example would be VirtualAlloc().

  4. This is usually the best option. Avoid having to manage the memory yourself at all. You can use STL containers to do just about anything you would do with raw memory, including allocating and initializing all in one fell swoop:

     std::vector<int> myInts(100, 0); // creates a vector of 100 ints, all set to zero
    

Is it possible to use jQuery to read meta tags

For select twitter meta name , you can add a data attribute.

example :

meta name="twitter:card" data-twitterCard="" content=""
$('[data-twitterCard]').attr('content');

Linq Query Group By and Selecting First Items

See LINQ: How to get the latest/last record with a group by clause

var firstItemsInGroup = from b in mainButtons
                 group b by b.category into g
select g.First();

I assume that mainButtons are already sorted correctly.

If you need to specify custom sort order, use OrderBy override with Comparer.

var firstsByCompareInGroups = from p in rows
        group p by p.ID into grp
        select grp.OrderBy(a => a, new CompareRows()).First();

See an example in my post "Select First Row In Group using Custom Comparer"

Calculating Page Table Size

Since the Logical Address space is 32-bit long that means program size is 2^32 bytes i.e. 4GB. Now we have the page size of 4KB i.e.2^12 bytes.Thus the number of pages in program are 2^20.(no. of pages in program = program size/page size).Now the size of page table entry is 4 byte hence the size of page table is 2^20*4 = 4MB(size of page table = no. of pages in program * page table entry size). Hence 4MB space is required in Memory to store the page table.

How to use callback with useState hook in react

we can write customise function which will call the callBack function if any changes in the state

import React, { useState, useEffect } from "react";
import ReactDOM from "react-dom";

import "./styles.css";

const useStateCallbackWrapper = (initilValue, callBack) => {
  const [state, setState] = useState(initilValue);
  useEffect(() => callBack(state), [state]);
  return [state, setState];
};

const callBack = state => {
  console.log("---------------", state);
};
function App() {
  const [count, setCount] = useStateCallbackWrapper(0, callBack);
  return (
    <div className="App">
      <h1>{count}</h1>
      <button onClick={() => setCount(count + 1)}>+</button>
      <h2>Start editing to see some magic happen!</h2>
    </div>
  );
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

`

What is the difference between .yaml and .yml extension?

File extensions do not have any bearing or impact on the content of the file. You can hold YAML content in files with any extension: .yml, .yaml or indeed anything else.

The (rather sparse) YAML FAQ recommends that you use .yaml in preference to .yml, but for historic reasons many Windows programmers are still scared of using extensions with more than three characters and so opt to use .yml instead.

So, what really matters is what is inside the file, rather than what its extension is.

How can I enable or disable the GPS programmatically on Android?

To turn GPS on or off programatically you need 'root' access and BusyBox installed. Even with those, the task is not trivial.

Sample's here: Google Drive, Github, Sourceforge

Tested with 2.3.5 and 4.1.2 Androids.

How do you fix the "element not interactable" exception?

It will be better to use xpath

from selenium import webdriver
driver.get('www.example.com')
button = driver.find_element_by_xpath('xpath')
button.click()

How to create a numpy array of arbitrary length strings?

You could use the object data type:

>>> import numpy
>>> s = numpy.array(['a', 'b', 'dude'], dtype='object')
>>> s[0] += 'bcdef'
>>> s
array([abcdef, b, dude], dtype=object)

How to include libraries in Visual Studio 2012?

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

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

#include "library.h"

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

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

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

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

4) Link the lib's *.lib files

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

5) Place *.dll files either:

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

How to update Pandas from Anaconda and is it possible to use eclipse with this last

The answer above did not work for me (python 3.6, Anaconda, pandas 0.20.3). It worked with

conda install -c anaconda pandas 

Unfortunately I do not know how to help with Eclipse.

setValue:forUndefinedKey: this class is not key value coding-compliant for the key

In my case I have IBOutlet UILabel *description in .h, it was with yellow /!\ - "will not synthesized", as I remember. Dunno what is it and why only this label.

But I got this crash and error like above. Deleted *description and recreate *description2. No crash in result.

Error in if/while (condition) {: missing Value where TRUE/FALSE needed

this works with "NA" not for NA

comments = c("no","yes","NA")
  for (l in 1:length(comments)) {
    #if (!is.na(comments[l])) print(comments[l])
    if (comments[l] != "NA") print(comments[l])
  }

How to run TestNG from command line

If you are using Maven, you can run it from the cmd line really easy, cd into the directory with the testng.xml (or whatever yours is called, the xml that has all the classes that will run) and run this cmd:

mvn clean test -DsuiteXmlFile=testng.xml 

This page explains it in much more detail: How to run testng.xml from Maven command line

I didn't know it mattered if you were using Maven or not so I didn't include it in my search terms, I thought I would mention it here in case others are in the same situation as I was.

Assign width to half available screen width declaratively

Using constraints layout

  1. Add a Guideline
  2. Set the percentage to 50%
  3. Constrain your view to the Guideline and the parent.

enter image description here

If you are having trouble changing it to a percentage, then see this answer.

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="81dp">

    <android.support.constraint.Guideline
        android:id="@+id/guideline8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5"/>

    <TextView
        android:id="@+id/textView6"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="TextView"
        app:layout_constraintBottom_toTopOf="@+id/guideline8"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>
    
</android.support.constraint.ConstraintLayout>

All inclusive Charset to avoid "java.nio.charset.MalformedInputException: Input length = 1"?

Well, the problem is that Files.newBufferedReader(Path path) is implemented like this :

public static BufferedReader newBufferedReader(Path path) throws IOException {
    return newBufferedReader(path, StandardCharsets.UTF_8);
}

so basically there is no point in specifying UTF-8 unless you want to be descriptive in your code. If you want to try a "broader" charset you could try with StandardCharsets.UTF_16, but you can't be 100% sure to get every possible character anyway.

jQuery "on create" event for dynamically-created elements

There is a plugin, adampietrasiak/jquery.initialize, which is based on MutationObserver that achieves this simply.

$.initialize(".some-element", function() {
    $(this).css("color", "blue");
});

How to get the Enum Index value in C#

You can directly cast it:

enum MyMonthEnum { January = 1, February, March, April, May, June, July, August, September, October, November, December };

public static string GetMyMonthName(int MonthIndex)
{
  MyMonthEnum MonthName = (MyMonthEnum)MonthIndex;
  return MonthName.ToString();
}

For Example:

string MySelectedMonthName=GetMyMonthName(8);
 //then MySelectedMonthName value will be August.

How do I get the output of a shell command executed using into a variable from Jenkinsfile (groovy)?

Easiest way is use this way

my_var=`echo 2` echo $my_var output : 2

note that is not simple single quote is back quote ( ` ).

WSDL vs REST Pros and Cons

Regarding WSDL (meaning "SOAP") as being "heavy-weight". Heavy matters how? If the toolset is doing all the "heavy lifting" for you, then why does it matter?

I have never yet needed to consume a complicated REST API. When I do, I expect I'll wish for a WSDL, which my tools will gladly convert into a set of proxy classes, so I can just call what appear to be methods. Instead, I suspect that in order to consume a non-trivial REST-based API, it will be necessary to write by hand a substantial amount of "light-weight" code.

Even when that's all done, you still will have translated human-readable documentation into code, with all the attendant risk that the humans read it wrong. Since WSDL is a machine-readable description of the service, it's much harder to "read it wrong".


Just a note: since this post, I have had the opportunity to work with a moderately complicated REST service. I did, indeed, wish for a WSDL or the equivalent, and I did, indeed, have to write a lot of code by hand. In fact, a substantial part of the development time was spent removing the code duplication of all the code that called different service operations "by hand".

Built in Python hash() function

Use hashlib as hash() was designed to be used to:

quickly compare dictionary keys during a dictionary lookup

and therefore does not guarantee that it will be the same across Python implementations.

How to create a scrollable Div Tag Vertically?

Well, your code worked for me (running Chrome 5.0.307.9 and Firefox 3.5.8 on Ubuntu 9.10), though I switched

overflow-y: scroll;

to

overflow-y: auto;

Demo page over at: http://davidrhysthomas.co.uk/so/tableDiv.html.

xhtml below:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>
    <META http-equiv="Content-Type" content="text/html; charset=UTF-8">

    <title>Div in table</title>
    <link rel="stylesheet" type="text/css" href="css/stylesheet.css" />

        <style type="text/css" media="all">

        th      {border-bottom: 2px solid #ccc; }

        th,td       {padding: 0.5em 1em; 
                margin: 0;
                border-collapse: collapse;
                }

        tr td:first-child
                {border-right: 2px solid #ccc; } 

        td > div    {width: 249px;
                height: 299px;
                background-color:Gray;
                overflow-y: auto;
                max-width:230px;
                max-height:100px;
                }
        </style>

    <script type="text/javascript" src="js/jquery.js"></script>

    <script type="text/javascript">

    </script>

</head>

<body>

<div>

    <table>

        <thead>
            <tr><th>This is column one</th><th>This is column two</th><th>This is column three</th>
        </thead>



        <tbody>
            <tr><td>This is row one</td><td>data point 2.1</td><td>data point 3.1</td>
            <tr><td>This is row two</td><td>data point 2.2</td><td>data point 3.2</td>
            <tr><td>This is row three</td><td>data point 2.3</td><td>data point 3.3</td>
            <tr><td>This is row four</td><td><div><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum ultricies mattis dolor. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Vestibulum a accumsan purus. Vivamus semper tempus nisi et convallis. Aliquam pretium rutrum lacus sed auctor. Phasellus viverra elit vel neque lacinia ut dictum mauris aliquet. Etiam elementum iaculis lectus, laoreet tempor ligula aliquet non. Mauris ornare adipiscing feugiat. Vivamus condimentum luctus tortor venenatis fermentum. Maecenas eu risus nec leo vehicula mattis. In nisi nibh, fermentum vitae tincidunt non, mattis eu metus. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Nunc vel est purus. Ut accumsan, elit non lacinia porta, nibh magna pretium ligula, sed iaculis metus tortor aliquam urna. Duis commodo tincidunt aliquam. Maecenas in augue ut ligula sodales elementum quis vitae risus. Vivamus mollis blandit magna, eu fringilla velit auctor sed.</p></div></td><td>data point 3.4</td>
            <tr><td>This is row five</td><td>data point 2.5</td><td>data point 3.5</td>
            <tr><td>This is row six</td><td>data point 2.6</td><td>data point 3.6</td>
            <tr><td>This is row seven</td><td>data point 2.7</td><td>data point 3.7</td>
        </body>



    </table>

</div>

</body>

</html>

Telnet is not recognized as internal or external command

If your Windows 7 machine is a member of an AD, or if you have UAC enabled, or if security policies are in effect, telnet more often than not must be run as an admin. The easiest way to do this is as follows

  1. Create a shortcut that calls cmd.exe

  2. Go to the shortcut's properties

  3. Click on the Advanced button

  4. Check the "Run as an administrator" checkbox

    After these steps you're all set and telnet should work now.

multiple classes on single element html

Short Answer

Yes.


Explanation

It is a good practice since an element can be a part of different groups, and you may want specific elements to be a part of more than one group. The element can hold an infinite number of classes in HTML5, while in HTML4 you are limited by a specific length.

The following example will show you the use of multiple classes.

The first class makes the text color red.

The second class makes the background-color blue.

See how the DOM Element with multiple classes will behave, it will wear both CSS statements at the same time.

Result: multiple CSS statements in different classes will stack up.

You can read more about CSS Specificity.


CSS

.class1 {
    color:red;
}

.class2 {
    background-color:blue;
}

HTML

<div class="class1">text 1</div>
<div class="class2">text 2</div>
<div class="class1 class2">text 3</div>

Live demo

jQuery table sort

This is a nice way of sorting a table:

_x000D_
_x000D_
$(document).ready(function () {_x000D_
                $('th').each(function (col) {_x000D_
                    $(this).hover(_x000D_
                            function () {_x000D_
                                $(this).addClass('focus');_x000D_
                            },_x000D_
                            function () {_x000D_
                                $(this).removeClass('focus');_x000D_
                            }_x000D_
                    );_x000D_
                    $(this).click(function () {_x000D_
                        if ($(this).is('.asc')) {_x000D_
                            $(this).removeClass('asc');_x000D_
                            $(this).addClass('desc selected');_x000D_
                            sortOrder = -1;_x000D_
                        } else {_x000D_
                            $(this).addClass('asc selected');_x000D_
                            $(this).removeClass('desc');_x000D_
                            sortOrder = 1;_x000D_
                        }_x000D_
                        $(this).siblings().removeClass('asc selected');_x000D_
                        $(this).siblings().removeClass('desc selected');_x000D_
                        var arrData = $('table').find('tbody >tr:has(td)').get();_x000D_
                        arrData.sort(function (a, b) {_x000D_
                            var val1 = $(a).children('td').eq(col).text().toUpperCase();_x000D_
                            var val2 = $(b).children('td').eq(col).text().toUpperCase();_x000D_
                            if ($.isNumeric(val1) && $.isNumeric(val2))_x000D_
                                return sortOrder == 1 ? val1 - val2 : val2 - val1;_x000D_
                            else_x000D_
                                return (val1 < val2) ? -sortOrder : (val1 > val2) ? sortOrder : 0;_x000D_
                        });_x000D_
                        $.each(arrData, function (index, row) {_x000D_
                            $('tbody').append(row);_x000D_
                        });_x000D_
                    });_x000D_
                });_x000D_
            });
_x000D_
            table, th, td {_x000D_
            border: 1px solid black;_x000D_
        }_x000D_
        th {_x000D_
            cursor: pointer;_x000D_
        }
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<table>_x000D_
        <tr><th>id</th><th>name</th><th>age</th></tr>_x000D_
        <tr><td>1</td><td>Julian</td><td>31</td></tr>_x000D_
        <tr><td>2</td><td>Bert</td><td>12</td></tr>_x000D_
        <tr><td>3</td><td>Xavier</td><td>25</td></tr>_x000D_
        <tr><td>4</td><td>Mindy</td><td>32</td></tr>_x000D_
        <tr><td>5</td><td>David</td><td>40</td></tr>_x000D_
    </table>
_x000D_
_x000D_
_x000D_

The fiddle can be found here:
https://jsfiddle.net/e3s84Luw/

The explanation can be found here: https://www.learningjquery.com/2017/03/how-to-sort-html-table-using-jquery-code

Using set_facts and with_items together in Ansible

There is a workaround which may help. You may "register" results for each set_fact iteration and then map that results to list:

---
- hosts: localhost
  tasks:
  - name: set fact
    set_fact: foo_item="{{ item }}"
    with_items:
      - four
      - five
      - six
    register: foo_result

  - name: make a list
    set_fact: foo="{{ foo_result.results | map(attribute='ansible_facts.foo_item') | list }}"

  - debug: var=foo

Output:

< TASK: debug var=foo >
 ---------------------
    \   ^__^
     \  (oo)\_______
        (__)\       )\/\
            ||----w |
            ||     ||


ok: [localhost] => {
    "var": {
        "foo": [
            "four", 
            "five", 
            "six"
        ]
    }
}

Disable single warning error

This question comes up as one of the top 3 hits for the Google search for "how to suppress -Wunused-result in c++", so I'm adding this answer here since I figured it out and want to help the next person.

In case your warning/error is -Wunused (or one of its sub-errors) or -Wunused -Werror only, the solution is to cast to void:

For -Wunused or one of its sub-errors only1, you can just cast it to void to disable the warning. This should work for any compiler and any IDE for both C and C++.

1Note 1: see gcc documentation here, for example, for a list of these warnings: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html, then search for the phrase "All the above -Wunused options combined" and look there for the main -Wunused warning and above it for its sub-warnings. The sub-warnings that -Wunused contains include:

  • -Wunused-but-set-parameter
  • -Wunused-but-set-variable
  • -Wunused-function
  • -Wunused-label
  • -Wunused-local-typedefs
  • -Wunused-parameter
  • -Wno-unused-result
  • -Wunused-variable
  • -Wunused-const-variable
  • -Wunused-const-variable=n
  • -Wunused-value
  • -Wunused = contains all of the above -Wunused options combined

Example of casting to void to suppress this warning:

// some "unused" variable you want to keep around
int some_var = 7;
// turn off `-Wunused` compiler warning for this one variable
// by casting it to void
(void)some_var;  // <===== SOLUTION! ======

For C++, this also works on functions which return a variable marked with [[nodiscard]]:

C++ attribute: nodiscard (since C++17)
If a function declared nodiscard or a function returning an enumeration or class declared nodiscard by value is called from a discarded-value expression other than a cast to void, the compiler is encouraged to issue a warning.
(Source: https://en.cppreference.com/w/cpp/language/attributes/nodiscard)

So, the solution is to cast the function call to void, as this is actually casting the value returned by the function (which is marked with the [[nodiscard]] attribute) to void.

Example:

// Some class or struct marked with the C++ `[[nodiscard]]` attribute
class [[nodiscard]] MyNodiscardClass 
{
public:
    // fill in class details here
private:
    // fill in class details here
};

// Some function which returns a variable previously marked with
// with the C++ `[[nodiscard]]` attribute
MyNodiscardClass MyFunc()
{
    MyNodiscardClass myNodiscardClass;
    return myNodiscardClass;
}

int main(int argc, char *argv[])
{
    // THE COMPILER WILL COMPLAIN ABOUT THIS FUNCTION CALL
    // IF YOU HAVE `-Wunused` turned on, since you are 
    // discarding a "nodiscard" return type by calling this
    // function and not using its returned value!
    MyFunc();

    // This is ok, however, as casing the returned value to
    // `void` suppresses this `-Wunused` warning!
    (void)MyFunc();  // <===== SOLUTION! ======
}

Lastly, you can also use the C++17 [[maybe_unused]] attribute: https://en.cppreference.com/w/cpp/language/attributes/maybe_unused.

Android Firebase, simply get one child object's data

Firebase listeners fire for both the initial data and any changes.

If you're looking to synchronize the data in a collection, use ChildEventListener. If you're looking to synchronize a single object, use ValueEventListener. Note that in both cases you're not "getting" the data. You're synchronizing it, which means that the callback may be invoked multiple times: for the initial data and whenever the data gets updated.

This is covered in Firebase's quickstart guide for Android. The relevant code and quote:

FirebaseRef.child("message").addValueEventListener(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot snapshot) {
    System.out.println(snapshot.getValue());  //prints "Do you have data? You'll love Firebase."
  }
  @Override
  public void onCancelled(DatabaseError databaseError) {        
  }
});

In the example above, the value event will fire once for the initial state of the data, and then again every time the value of that data changes.

Please spend a few moments to go through that quick start. It shouldn't take more than 15 minutes and it will save you from a lot of head scratching and questions. The Firebase Android Guide is probably a good next destination, for this question specifically: https://firebase.google.com/docs/database/android/read-and-write

How to remove the focus from a TextBox in WinForms?

Try disabling and enabling the textbox.

Replace non-numeric with empty string

You don't need to use Regex.

phone = new String(phone.Where(c => char.IsDigit(c)).ToArray())

org.springframework.beans.factory.BeanCreationException: Error creating bean with name

According to the stack trace, your issue is that your app cannot find org.apache.commons.dbcp.BasicDataSource, as per this line:

java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource

I see that you have commons-dbcp in your list of jars, but for whatever reason, your app is not finding the BasicDataSource class in it.

Getting value of HTML Checkbox from onclick/onchange events

The short answer:

Use the click event, which won't fire until after the value has been updated, and fires when you want it to:

<label><input type='checkbox' onclick='handleClick(this);'>Checkbox</label>

function handleClick(cb) {
  display("Clicked, new value = " + cb.checked);
}

Live example | Source

The longer answer:

The change event handler isn't called until the checked state has been updated (live example | source), but because (as Tim Büthe points out in the comments) IE doesn't fire the change event until the checkbox loses focus, you don't get the notification proactively. Worse, with IE if you click a label for the checkbox (rather than the checkbox itself) to update it, you can get the impression that you're getting the old value (try it with IE here by clicking the label: live example | source). This is because if the checkbox has focus, clicking the label takes the focus away from it, firing the change event with the old value, and then the click happens setting the new value and setting focus back on the checkbox. Very confusing.

But you can avoid all of that unpleasantness if you use click instead.

I've used DOM0 handlers (onxyz attributes) because that's what you asked about, but for the record, I would generally recommend hooking up handlers in code (DOM2's addEventListener, or attachEvent in older versions of IE) rather than using onxyz attributes. That lets you attach multiple handlers to the same element and lets you avoid making all of your handlers global functions.


An earlier version of this answer used this code for handleClick:

function handleClick(cb) {
  setTimeout(function() {
    display("Clicked, new value = " + cb.checked);
  }, 0);
}

The goal seemed to be to allow the click to complete before looking at the value. As far as I'm aware, there's no reason to do that, and I have no idea why I did. The value is changed before the click handler is called. In fact, the spec is quite clear about that. The version without setTimeout works perfectly well in every browser I've tried (even IE6). I can only assume I was thinking about some other platform where the change isn't done until after the event. In any case, no reason to do that with HTML checkboxes.

Not able to pip install pickle in python 3.6

$ pip install pickle5
import pickle5 as pickle

pb = pickle.PickleBuffer(b"foo")
data = pickle.dumps(pb, protocol=5)
assert pickle.loads(data) == b"foo"

This package backports all features and APIs added in the pickle module in Python 3.8.3, including the PEP 574 additions. It should work with Python 3.5, 3.6 and 3.7.

Basic usage is similar to the pickle module, except that the module to be imported is pickle5:

https://pypi.org/project/pickle5/

How to resolve "gpg: command not found" error during RVM installation?

On my clean macOS 10.15.7, I needed to brew link gnupg && brew unlink gnupg first and then used Ashish's answer to use gpg instead of gpg2. I also had to chown a few directories. before the un/link.

How to set combobox default value?

Suppose you bound your combobox to a List<Person>

List<Person> pp = new List<Person>();
pp.Add(new Person() {id = 1, name="Steve"});
pp.Add(new Person() {id = 2, name="Mark"});
pp.Add(new Person() {id = 3, name="Charles"});

cbo1.DisplayMember = "name";
cbo1.ValueMember = "id";
cbo1.DataSource = pp;

At this point you cannot set the Text property as you like, but instead you need to add an item to your list before setting the datasource

pp.Insert(0, new Person() {id=-1, name="--SELECT--"});
cbo1.DisplayMember = "name";
cbo1.ValueMember = "id";
cbo1.DataSource = pp;
cbo1.SelectedIndex = 0;

Of course this means that you need to add a checking code when you try to use the info from the combobox

if(cbo1.SelectedValue != null && Convert.ToInt32(cbo1.SelectedValue) == -1)
    MessageBox.Show("Please select a person name");
else
    ...... 

The code is the same if you use a DataTable instead of a list. You need to add a fake row at the first position of the Rows collection of the datatable and set the initial index of the combobox to make things clear. The only thing you need to look at are the name of the datatable columns and which columns should contain a non null value before adding the row to the collection

In a table with three columns like ID, FirstName, LastName with ID,FirstName and LastName required you need to

DataRow row = datatable.NewRow();
row["ID"] = -1;
row["FirstName"] = "--Select--";    
row["LastName"] = "FakeAddress";
dataTable.Rows.InsertAt(row, 0);

SQL Server convert select a column and convert it to a string

There is new method in SQL Server 2017:

SELECT STRING_AGG (column, ',') AS column FROM Table;

that will produce 1,3,5,9 for you

Bash: Strip trailing linebreak from output

If you want to print output of anything in Bash without end of line, you echo it with the -n switch.

If you have it in a variable already, then echo it with the trailing newline cropped:

$ testvar=$(wc -l < log.txt)
$ echo -n $testvar

Or you can do it in one line, instead:

$ echo -n $(wc -l < log.txt)

HTML Submit-button: Different value / button-text?

It's possible using the button element.

<button name="name" value="value" type="submit">Sök</button>

From the W3C page on button:

Buttons created with the BUTTON element function just like buttons created with the INPUT element, but they offer richer rendering possibilities: the BUTTON element may have content.

How to check if an integer is in a given range?

ValueRange range = java.time.temporal.ValueRange.of(minValue, maxValue);
range.isValidIntValue(x);

it returns true if minValue <= x <= MaxValue - i.e within the range

it returns false if x < minValue or x > maxValue - i.e outofrange

Use with if condition as shown below:

int value = 10;
if(ValueRange.of(0, 100).isValidIntValue(value)) {
    System.out.println("Value is with in the Range.");
} else {
    System.out.println("Value is out of the Range.");
}

below program checks, if any of the passed integer value in the hasTeen method is within the range of 13(inclusive) to 19(Inclusive)


import java.time.temporal.ValueRange;    
public class TeenNumberChecker {

    public static void main(String[] args) {
        System.out.println(hasTeen(9, 99, 19));
        System.out.println(hasTeen(23, 15, 42));
        System.out.println(hasTeen(22, 23, 34));

    }

    public static boolean hasTeen(int firstNumber, int secondNumber, int thirdNumber) {

        ValueRange range = ValueRange.of(13, 19);
        System.out.println("*********Int validation Start ***********");
        System.out.println(range.isIntValue());
        System.out.println(range.isValidIntValue(firstNumber));
        System.out.println(range.isValidIntValue(secondNumber));
        System.out.println(range.isValidIntValue(thirdNumber));
        System.out.println(range.isValidValue(thirdNumber));
        System.out.println("**********Int validation End**************");

        if (range.isValidIntValue(firstNumber) || range.isValidIntValue(secondNumber) || range.isValidIntValue(thirdNumber)) {
            return true;
        } else
            return false;
    }
}

******OUTPUT******

true as 19 is part of range

true as 15 is part of range

false as all three value passed out of range

How to split one text file into multiple *.txt files?

Try something like this:

awk -vc=1 'NR%1000000==0{++c}{print $0 > c".txt"}' Datafile.txt

for filename in *.txt; do mv "$filename" "Prefix_$filename"; done;

Format SQL in SQL Server Management Studio

There is a special trick I discovered by accident.

  1. Select the query you wish to format.
  2. Ctrl+Shift+Q (This will open your query in the query designer)
  3. Then just go OK Voila! Query designer will format your query for you. Caveat is that you can only do this for statements and not procedural code, but its better than nothing.

Access files stored on Amazon S3 through web browser

I found this related question: Directory Listing in S3 Static Website

As it turns out, if you enable public read for the whole bucket, S3 can serve directory listings. Problem is they are in XML instead of HTML, so not very user-friendly.

There are three ways you could go for generating listings:

  • Generate index.html files for each directory on your own computer, upload them to s3, and update them whenever you add new files to a directory. Very low-tech. Since you're saying you're uploading build files straight from Travis, this may not be that practical since it would require doing extra work there.

  • Use a client-side S3 browser tool.

  • Use a server-side browser tool.

    • s3browser (PHP)
    • s3index Scala. Going by the existence of a Procfile, it may be readily deployable to Heroku. Not sure since I don't have any experience with Scala.

Operation is not valid due to the current state of the object, when I select a dropdown list

From http://codecorner.galanter.net/2012/06/04/solution-for-operation-is-not-valid-due-to-the-current-state-of-the-object-error/

Issue happens because Microsoft Security Update MS11-100 limits number of keys in Forms collection during HTTP POST request. To alleviate this problem you need to increase that number.

This can be done in your application Web.Config in the <appSettings> section (create the section directly under <configuration> if it doesn’t exist). Add 2 lines similar to the lines below to the section:

<add key="aspnet:MaxHttpCollectionKeys" value="2000" />
<add key="aspnet:MaxJsonDeserializerMembers" value="2000" />

The above example set the limit to 2000 keys. This will lift the limitation and the error should go away.

Setting href attribute at runtime

To get or set an attribute of an HTML element, you can use the element.attr() function in jQuery.

To get the href attribute, use the following code:

var a_href = $('selector').attr('href');

To set the href attribute, use the following code:

$('selector').attr('href','http://example.com');

In both cases, please use the appropriate selector. If you have set the class for the anchor element, use '.class-name' and if you have set the id for the anchor element, use '#element-id'.

TypeError: Missing 1 required positional argument: 'self'

Works and is simpler than every other solution I see here :

Pump().getPumps()

This is great if you don't need to reuse a class instance. Tested on Python 3.7.3.

How to get name of calling function/method in PHP?

I just wrote a version of this called "get_caller", I hope it helps. Mine is pretty lazy. You can just run get_caller() from a function, you don't have to specify it like this:

get_caller(__FUNCTION__);

Here's the script in full with a quirky test case:

<?php

/* This function will return the name string of the function that called $function. To return the
    caller of your function, either call get_caller(), or get_caller(__FUNCTION__).
*/
function get_caller($function = NULL, $use_stack = NULL) {
    if ( is_array($use_stack) ) {
        // If a function stack has been provided, used that.
        $stack = $use_stack;
    } else {
        // Otherwise create a fresh one.
        $stack = debug_backtrace();
        echo "\nPrintout of Function Stack: \n\n";
        print_r($stack);
        echo "\n";
    }

    if ($function == NULL) {
        // We need $function to be a function name to retrieve its caller. If it is omitted, then
        // we need to first find what function called get_caller(), and substitute that as the
        // default $function. Remember that invoking get_caller() recursively will add another
        // instance of it to the function stack, so tell get_caller() to use the current stack.
        $function = get_caller(__FUNCTION__, $stack);
    }

    if ( is_string($function) && $function != "" ) {
        // If we are given a function name as a string, go through the function stack and find
        // it's caller.
        for ($i = 0; $i < count($stack); $i++) {
            $curr_function = $stack[$i];
            // Make sure that a caller exists, a function being called within the main script
            // won't have a caller.
            if ( $curr_function["function"] == $function && ($i + 1) < count($stack) ) {
                return $stack[$i + 1]["function"];
            }
        }
    }

    // At this stage, no caller has been found, bummer.
    return "";
}

// TEST CASE

function woman() {
    $caller = get_caller(); // No need for get_caller(__FUNCTION__) here
    if ($caller != "") {
        echo $caller , "() called " , __FUNCTION__ , "(). No surprises there.\n";
    } else {
        echo "no-one called ", __FUNCTION__, "()\n";
    }
}

function man() {
    // Call the woman.
    woman();
}

// Don't keep him waiting
man();

// Try this to see what happens when there is no caller (function called from main script)
//woman();

?>

man() calls woman(), who calls get_caller(). get_caller() doesn't know who called it yet, because the woman() was cautious and didn't tell it, so it recurses to find out. Then it returns who called woman(). And the printout in source-code mode in a browser shows the function stack:

Printout of Function Stack: 

Array
(
    [0] => Array
        (
            [file] => /Users/Aram/Development/Web/php/examples/get_caller.php
            [line] => 46
            [function] => get_caller
            [args] => Array
                (
                )

        )

    [1] => Array
        (
            [file] => /Users/Aram/Development/Web/php/examples/get_caller.php
            [line] => 56
            [function] => woman
            [args] => Array
                (
                )

        )

    [2] => Array
        (
            [file] => /Users/Aram/Development/Web/php/examples/get_caller.php
            [line] => 60
            [function] => man
            [args] => Array
                (
                )

        )

)

man() called woman(). No surprises there.

How to cast int to enum in C++?

Your code

enum Test
{
    A, B
}

int a = 1;

Solution

Test castEnum = static_cast<Test>(a);

What is the difference between user variables and system variables?

Just recreate the Path variable in users. Go to user variables, highlight path, then new, the type in value. Look on another computer with same version windows. Usually it is in windows 10: Path %USERPROFILE%\AppData\Local\Microsoft\WindowsApps;

Returning an empty array

There is no difference except the fact that foo performs 3 visible method calls to return empty array that is anyway created while bar() just creates this array and returns it.

%matplotlib line magic causes SyntaxError in Python script

This is the case you are using Julia:

The analogue of IPython's %matplotlib in Julia is to use the PyPlot package, which gives a Julia interface to Matplotlib including inline plots in IJulia notebooks. (The equivalent of numpy is already loaded by default in Julia.) Given PyPlot, the analogue of %matplotlib inline is using PyPlot, since PyPlot defaults to inline plots in IJulia.

How to get raw text from pdf file using java

You can use iText for do such things

//iText imports

import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.parser.PdfTextExtractor;

for example:

try {     
    PdfReader reader = new PdfReader(INPUTFILE);
    int n = reader.getNumberOfPages(); 
    String str=PdfTextExtractor.getTextFromPage(reader, 2); //Extracting the content from a particular page.
    System.out.println(str);
    reader.close();
} catch (Exception e) {
    System.out.println(e);
}

another one

try {

    PdfReader reader = new PdfReader("c:/temp/test.pdf");
    System.out.println("This PDF has "+reader.getNumberOfPages()+" pages.");
    String page = PdfTextExtractor.getTextFromPage(reader, 2);
    System.out.println("Page Content:\n\n"+page+"\n\n");
    System.out.println("Is this document tampered: "+reader.isTampered());
    System.out.println("Is this document encrypted: "+reader.isEncrypted());
} catch (IOException e) {
    e.printStackTrace();
}

the above examples can only extract the text, but you need to do some more to remove hyperlinks, bullets, heading & numbers.

Quick easy way to migrate SQLite3 to MySQL?

Based on Jims's solution: Quick easy way to migrate SQLite3 to MySQL?

sqlite3 your_sql3_database.db .dump | python ./dump.py > your_dump_name.sql
cat your_dump_name.sql | sed '1d' | mysql --user=your_mysql_user --default-character-set=utf8 your_mysql_db -p  

This works for me. I use sed just to throw the first line, which is not mysql-like, but you might as well modify dump.py script to throw this line away.

Convert seconds to hh:mm:ss in Python

I can't believe any of the many answers gives what I'd consider the "one obvious way to do it" (and I'm not even Dutch...!-) -- up to just below 24 hours' worth of seconds (86399 seconds, specifically):

>>> import time
>>> time.strftime('%H:%M:%S', time.gmtime(12345))
'03:25:45'

Doing it in a Django template's more finicky, since the time filter supports a funky time-formatting syntax (inspired, I believe, from PHP), and also needs the datetime module, and a timezone implementation such as pytz, to prep the data. For example:

>>> from django import template as tt
>>> import pytz
>>> import datetime
>>> tt.Template('{{ x|time:"H:i:s" }}').render(
...     tt.Context({'x': datetime.datetime.fromtimestamp(12345, pytz.utc)}))
u'03:25:45'

Depending on your exact needs, it might be more convenient to define a custom filter for this formatting task in your app.

How to sort a list/tuple of lists/tuples by the element at a given index?

sorted_by_second = sorted(data, key=lambda tup: tup[1])

or:

data.sort(key=lambda tup: tup[1])  # sorts in place

How does the stack work in assembly language?

I haven't seen the Gas assembler specifically, but in general the stack is "implemented" by maintaining a reference to the location in memory where the top of the stack resides. The memory location is stored in a register, which has different names for different architectures, but can be thought of as the stack pointer register.

The pop and push commands are implemented in most architectures for you by building upon micro instructions. However, some "Educational Architectures" require you implement them your self. Functionally, push would be implemented somewhat like this:

   load the address in the stack pointer register to a gen. purpose register x
   store data y at the location x
   increment stack pointer register by size of y

Also, some architectures store the last used memory address as the Stack Pointer. Some store the next available address.

Multi-line bash commands in makefile

The ONESHELL directive allows to write multiple line recipes to be executed in the same shell invocation.

all: foo

SOURCE_FILES = $(shell find . -name '*.c')

.ONESHELL:
foo: ${SOURCE_FILES}
    FILES=()
    for F in $^; do
        FILES+=($${F})
    done
    gcc "$${FILES[@]}" -o $@

There is a drawback though : special prefix characters (‘@’, ‘-’, and ‘+’) are interpreted differently.

https://www.gnu.org/software/make/manual/html_node/One-Shell.html

How to read the last row with SQL Server

Well I'm not getting the "last value" in a table, I'm getting the Last value per financial instrument. It's not the same but I guess it is relevant for some that are looking to look up on "how it is done now". I also used RowNumber() and CTE's and before that to simply take 1 and order by [column] desc. however we nolonger need to...

I am using SQL server 2017, we are recording all ticks on all exchanges globally, we have ~12 billion ticks a day, we store each Bid, ask, and trade including the volumes and the attributes of a tick (bid, ask, trade) of any of the given exchanges.

We have 253 types of ticks data for any given contract (mostly statistics) in that table, the last traded price is tick type=4 so, when we need to get the "last" of Price we use :

select distinct T.contractId,
LAST_VALUE(t.Price)over(partition by t.ContractId order by created ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING)
from [dbo].[Tick] as T
where T.TickType=4

You can see the execution plan on my dev system it executes quite efficient, executes in 4 sec while the exchange import ETL is pumping data into the table, there will be some locking slowing me down... that's just how live systems work. execution plan against 85,697,659 rows

Change icon-bar (?) color in bootstrap

The reason your CSS isn't working is because of specificity. The Bootstrap selector has a higher specificity than yours, so your style is completely ignored.

Bootstrap styles this with the selector: .navbar-default .navbar-toggle .icon-bar. This selector has a B specificity value of 3, whereas yours only has a B specificity value of 1.

Therefore, to override this, simply use the same selector in your CSS (assuming your CSS is included after Bootstrap's):

.navbar-default .navbar-toggle .icon-bar {
    background-color: black;
}

HTTP Content-Type Header and JSON

Recently ran into a problem with this and a Chrome extension that was corrupting a JSON stream when the response header labeled the content-type as 'text/html' apparently extensions can and will use the response header to alter the content prior to further processing by the browser. Changing the content-type fixed the issue.

Bootstrap-select - how to fire event on change

This is what I did.

$('.selectpicker').on('changed.bs.select', function (e, clickedIndex, newValue, oldValue) {
    var selected = $(e.currentTarget).val();
});

start/play embedded (iframe) youtube-video on click of an image

You can do this simply like this

$('#image_id').click(function() {
  $("#some_id iframe").attr('src', $("#some_id iframe", parent).attr('src') + '?autoplay=1'); 
});

where image_id is your image id you are clicking and some_id is id of div in which iframe is also you can use iframe id directly.

How to Set Opacity (Alpha) for View in Android

What I would suggest you do is create a custom ARGB color in your colors.xml file such as :

<resources>
<color name="translucent_black">#80000000</color>
</resources>

then set your button background to that color :

android:background="@android:color/translucent_black"

Another thing you can do if you want to play around with the shape of the button is to create a Shape drawable resource where you set up the properties what the button should look like :

file: res/drawable/rounded_corner_box.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:startColor="#80000000"
        android:endColor="#80FFFFFF"
        android:angle="45"/>
    <padding android:left="7dp"
        android:top="7dp"
        android:right="7dp"
        android:bottom="7dp" />
    <corners android:radius="8dp" />
</shape>

Then use that as the button background :

    android:background="@drawable/rounded_corner_box"

How to post data in PHP using file_get_contents?

Sending an HTTP POST request using file_get_contents is not that hard, actually : as you guessed, you have to use the $context parameter.


There's an example given in the PHP manual, at this page : HTTP context options (quoting) :

$postdata = http_build_query(
    array(
        'var1' => 'some content',
        'var2' => 'doh'
    )
);

$opts = array('http' =>
    array(
        'method'  => 'POST',
        'header'  => 'Content-Type: application/x-www-form-urlencoded',
        'content' => $postdata
    )
);

$context  = stream_context_create($opts);

$result = file_get_contents('http://example.com/submit.php', false, $context);

Basically, you have to create a stream, with the right options (there is a full list on that page), and use it as the third parameter to file_get_contents -- nothing more ;-)


As a sidenote : generally speaking, to send HTTP POST requests, we tend to use curl, which provides a lot of options an all -- but streams are one of the nice things of PHP that nobody knows about... too bad...

Check if a string is html or not

With jQuery:

function isHTML(str) {
  return /^<.*?>$/.test(str) && !!$(str)[0];
}

How to push a single file in a subdirectory to Github (not master)

Very simple. Just follow these procedure:
1. git status
2. git add {File_Name} //the file name you haven been changed
3. git status
4. git commit -m '{your_message}'
5. git push origin master

How to import Maven dependency in Android Studio/IntelliJ?

Try itext. Add dependency to your build.gradle for latest as of this post

Note: special version for android, trailing "g":

dependencies {
    compile 'com.itextpdf:itextg:5.5.9'
}

Spring Boot Rest Controller how to return different HTTP status codes?

Try this code:

@RequestMapping(value = "/validate", method = RequestMethod.GET, produces = "application/json")
public ResponseEntity<ErrorBean> validateUser(@QueryParam("jsonInput") final String jsonInput) {
    int numberHTTPDesired = 400;
    ErrorBean responseBean = new ErrorBean();
    responseBean.setError("ERROR");
    responseBean.setMensaje("Error in validation!");

    return new ResponseEntity<ErrorBean>(responseBean, HttpStatus.valueOf(numberHTTPDesired));
}

Node - how to run app.js?

Node is complaining because there is no function called define, which your code tries to call on its very first line.

define comes from AMD, which is not used in standard node development.

It is possible that the developer you got your project from used some kind of trickery to use AMD in node. You should ask this person what special steps are necessary to run the code.

How to override !important?

Override using JavaScript

$('.mytable td').attr('style', 'display: none !important');

Worked for me.

jQuery validate: How to add a rule for regular expression validation?

I got it to work like this:

$.validator.addMethod(
    "regex",
    function(value, element, regexp) {
        return this.optional(element) || regexp.test(value);
    },
    "Please check your input."
);


$(function () {
    $('#uiEmailAdress').focus();
    $('#NewsletterForm').validate({
        rules: {
            uiEmailAdress:{
                required: true,
                email: true,
                minlength: 5
            },
            uiConfirmEmailAdress:{
                required: true,
                email: true,
                equalTo: '#uiEmailAdress'
            },
            DDLanguage:{
                required: true
            },
            Testveld:{
                required: true,
                regex: /^[0-9]{3}$/
            }
        },
        messages: {
            uiEmailAdress:{
                required: 'Verplicht veld',
                email: 'Ongeldig emailadres',
                minlength: 'Minimum 5 charaters vereist'
            },
            uiConfirmEmailAdress:{
                required: 'Verplicht veld',
                email: 'Ongeldig emailadres',
                equalTo: 'Veld is niet gelijk aan E-mailadres'
            },
            DDLanguage:{
                required: 'Verplicht veld'
            },
            Testveld:{
                required: 'Verplicht veld',
                regex: '_REGEX'
            }
        }
    });
});

Make sure that the regex is between / :-)

How can I change the color of AlertDialog title and the color of the line under it

Instead of using divider in dialog, use the view in the custom layout and set the layout as custom layout in dialog.

custom_popup.xml:

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

    <com.divago.view.TextViewMedium
        android:id="@+id/txtTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingBottom="10dp"
        android:paddingTop="10dp"
        android:text="AlertDialog"
        android:textColor="@android:color/black"
        android:textSize="20sp" />

    <View
        android:id="@+id/border"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@id/txtTitle"
        android:background="@color/txt_dark_grey" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/border"
        android:scrollbars="vertical">

        <com.divago.view.TextViewRegular
            android:id="@+id/txtPopup"
            android:layout_margin="15dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </ScrollView>
</RelativeLayout>

activity.java:

public void showPopUp(String title, String text) {

    LayoutInflater inflater = getLayoutInflater();
    View alertLayout = inflater.inflate(R.layout.custom_popup, null);

    TextView txtContent = alertLayout.findViewById(R.id.txtPopup);
    txtContent.setText(text);

    TextView txtTitle = alertLayout.findViewById(R.id.txtTitle);
    txtTitle.setText(title);

    AlertDialog.Builder alert = new AlertDialog.Builder(this);
    alert.setView(alertLayout);
    alert.setCancelable(true);

    alert.setPositiveButton("Done", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.dismiss();
        }
    });

    AlertDialog dialog = alert.create();
    dialog.show();
}

How to vertically center an image inside of a div element in HTML using CSS?

In your example, the div's height is static and the image's height is static. Give the image a margin-top value of ( div_height - image_height ) / 2

If the image is 50px, then

img {
    margin-top: 25px;
}

python pandas: apply a function with arguments to a series

Newer versions of pandas do allow you to pass extra arguments (see the new documentation). So now you can do:

my_series.apply(your_function, args=(2,3,4), extra_kw=1)

The positional arguments are added after the element of the series.


For older version of pandas:

The documentation explains this clearly. The apply method accepts a python function which should have a single parameter. If you want to pass more parameters you should use functools.partial as suggested by Joel Cornett in his comment.

An example:

>>> import functools
>>> import operator
>>> add_3 = functools.partial(operator.add,3)
>>> add_3(2)
5
>>> add_3(7)
10

You can also pass keyword arguments using partial.

Another way would be to create a lambda:

my_series.apply((lambda x: your_func(a,b,c,d,...,x)))

But I think using partial is better.

Could not find server 'server name' in sys.servers. SQL Server 2014

At first check out that your linked server is in the list by this query

select name from sys.servers

If it not exists then try to add to the linked server

EXEC sp_addlinkedserver @server = 'SERVER_NAME' --or may be server ip address

After that login to that linked server by

EXEC sp_addlinkedsrvlogin 'SERVER_NAME'
                         ,'false'
                         ,NULL
                         ,'USER_NAME'
                         ,'PASSWORD'

Then you can do whatever you want ,treat it like your local server

exec [SERVER_NAME].[DATABASE_NAME].dbo.SP_NAME @sample_parameter

Finally you can drop that server from linked server list by

sp_dropserver 'SERVER_NAME', 'droplogins'

If it will help you then please upvote.

Git - how delete file from remote repository

Visual Studio Code:

Delete the files from your Explorer view. You see them crossed-out in your Branch view. Then commit and Sync.

enter image description here

Be aware: If files are on your .gitignore list, then the delete "update" will not be pushed and therefore not be visible. VS Code will warn you if this is the case, though. -> Exclude the files/folder from gitignore temporarily.

Java JDBC - How to connect to Oracle using Service Name instead of SID

http://download.oracle.com/docs/cd/B28359_01/java.111/b31224/urls.htm#BEIDHCBA

Thin-style Service Name Syntax

Thin-style service names are supported only by the JDBC Thin driver. The syntax is:

@//host_name:port_number/service_name

For example:

jdbc:oracle:thin:scott/tiger@//myhost:1521/myservicename

So I would try:

jdbc:oracle:thin:@//oracle.hostserver2.mydomain.ca:1522/ABCD

Also, per Robert Greathouse's answer, you can also specify the TNS name in the JDBC URL as below:

jdbc:oracle:thin:@(DESCRIPTION =(ADDRESS_LIST =(ADDRESS =(PROTOCOL=TCP)(HOST=blah.example.com)(PORT=1521)))(CONNECT_DATA=(SID=BLAHSID)(GLOBAL_NAME=BLAHSID.WORLD)(SERVER=DEDICATED)))

Which icon sizes should my Windows application's icon include?

(Updated answer for Windows 8/10)

View full list of guidelines and sizes here, in new Windows design guidelines: https://msdn.microsoft.com/en-us/windows/uwp/controls-and-patterns/tiles-and-notifications-app-assets#asset-types

Still include .ICO file with these sizes to support legacy experiences:

  • 16x16
  • 24x24
  • 32x32
  • 48x48
  • 256x256

How to solve "Plugin execution not covered by lifecycle configuration" for Spring Data Maven Builds

you can suppress this error in eclipse: Window -> Preferences -> Maven -> Error/Warnings

How to read file from relative path in Java project? java.io.File cannot find the path specified

If text file is not being read, try using a more closer absolute path (if you wish you could use complete absolute path,) like this:

FileInputStream fin=new FileInputStream("\\Dash\\src\\RS\\Test.txt");

assume that the absolute path is:

C:\\Folder1\\Folder2\\Dash\\src\\RS\\Test.txt

Oracle date difference to get number of years

Need to find difference in year, if leap year the a year is of 366 days.

I dont work in oracle much, please make this better. Here is how I did:

SELECT CASE
          WHEN    ( (fromisleapyear = 'Y') AND (frommonth < 3))
               OR ( (toisleapyear = 'Y') AND (tomonth > 2)) THEN
             datedif / 366
          ELSE
             datedif / 365
       END
          yeardifference
  FROM (SELECT datedif,
               frommonth,
               tomonth,
               CASE
                  WHEN (       (MOD (fromyear, 4) = 0)
                           AND (MOD (fromyear, 100) <> 0)
                        OR (MOD (fromyear, 400) = 0)) THEN
                     'Y'
               END
                  fromisleapyear,
               CASE
                  WHEN (   (MOD (toyear, 4) = 0) AND (MOD (toyear, 100) <> 0)
                        OR (MOD (toyear, 400) = 0)) THEN
                     'Y'
               END
                  toisleapyear
          FROM (SELECT (:todate - :fromdate) AS datedif,
                       TO_CHAR (:fromdate, 'YYYY') AS fromyear,
                       TO_CHAR (:fromdate, 'MM') AS frommonth,
                       TO_CHAR (:todate, 'YYYY') AS toyear,
                       TO_CHAR (:todate, 'MM') AS tomonth
                  FROM DUAL))

git status shows modifications, git checkout -- <file> doesn't remove them

We faced a similar situation in our company. None of the proposed methods did not help us. As a result of the research, the problem was revealed. The thing was that in Git there were two files, the names of which differed only in the register of symbols. Unix-systems saw them as two different files, but Windows was going crazy. To solve the problem, we deleted one of the files on the server. After that, at the local repositories on Windows helped the next few commands (in different sequences):

git reset --hard
git pull origin
git merge

How to bind a List<string> to a DataGridView control?

you can also use linq and anonymous types to achieve the same result with much less code as described here.

UPDATE: blog is down, here's the content:

(..) The values shown in the table represent the length of strings instead of string values (!) It may seem strange, but that’s how binding mechanism works by default – given an object it will try to bind to the first property of that object (the first property it can find). When passed an instance the String class the property it binds to is String.Length since there’s no other property that would provide the actual string itself.

That means that to get our binding right we need a wrapper object that will expose the actual value of a string as a property:

public class StringWrapper
    {
     string stringValue;
     public string StringValue { get { return stringValue; } set { stringValue = value; } }

     public StringWrapper(string s)
     {
     StringValue = s;
     }
  }   

   List<StringWrapper> testData = new List<StringWrapper>();

   // add data to the list / convert list of strings to list of string wrappers

  Table1.SetDataBinding(testdata);

While this solution works as expected it requires quite a few lines of code (mostly to convert list of strings to the list of string wrappers).

We can improve this solution by using LINQ and anonymous types- we’ll use LINQ query to create a new list of string wrappers (string wrapper will be an anonymous type in our case).

 var values = from data in testData select new { Value = data };

 Table1.SetDataBinding(values.ToList());

The last change we’re going to make is to move the LINQ code to an extension method:

public static class StringExtensions
  {
     public static IEnumerable CreateStringWrapperForBinding(this IEnumerable<string> strings)
     {
     var values = from data in strings
     select new { Value = data };

     return values.ToList();
     }

This way we can reuse the code by calling single method on any collection of strings:

Table1.SetDataBinding(testData.CreateStringWrapperForBinding());

Commenting out code blocks in Atom

Atom does not have block comment by default, so I would recommend searching for atom packages by "block comment" and install the one suits to you.

I prefer https://atom.io/packages/block-comment because is has the closest keyboard shortcut to line comment and it works as i need it to, meaning it would not comment the whole line but only the selected text.

line comment: CTRL+/ block comment: CTRL+SHIFT+/ (with the plugin installed)

How to merge two PDF files into one in Java?

A quick Google search returned this bug: "Bad file descriptor while saving a document w. imported PDFs".

It looks like you need to keep the PDFs to be merged open, until after you have saved and closed the combined PDF.

LIKE operator in LINQ

In native LINQ you may use combination of Contains/StartsWith/EndsWith or RegExp.

In LINQ2SQL use method SqlMethods.Like()

    from i in db.myTable
    where SqlMethods.Like(i.field, "tra%ata")
    select i

add Assembly: System.Data.Linq (in System.Data.Linq.dll) to use this feature.

How to disable HTML button using JavaScript?

I think the best way could be:

$("#ctl00_ContentPlaceHolder1_btnPlaceOrder").attr('disabled', true);

It works fine cross-browser.

How to obtain the location of cacerts of the default java installation?

In High Sierra, the cacerts is located at : /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/security/cacerts

How do I set the focus to the first input element in an HTML form independent from the id?

Putting this code at the end of your body tag will focus the first visible, non-hidden enabled element on the screen automatically. It will handle most cases I can come up with on short notice.

<script>
    (function(){
        var forms = document.forms || [];
        for(var i = 0; i < forms.length; i++){
            for(var j = 0; j < forms[i].length; j++){
                if(!forms[i][j].readonly != undefined && forms[i][j].type != "hidden" && forms[i][j].disabled != true && forms[i][j].style.display != 'none'){
                    forms[i][j].focus();
                    return;
                }
            }
        }
    })();
</script>

AcquireConnection method call to the connection manager <Excel Connection Manager> failed with error code 0xC0202009

If you are receiving preview of data in the excel source. But while executing the data flow task you receive Acquire connection error. Then move the file to local system and change the file path in excel connection manager and try executing again.

Android WSDL/SOAP service client

   public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Set View to register.xml
    setContentView(R.layout.register);
    session = new UserSessionManeger(getApplicationContext());     

    login_id= (EditText) findViewById(R.id.loginid);
    Suponser_id= (EditText) findViewById(R.id.sponserid);
    name=(EditText) findViewById(R.id.name);
    pass=(EditText) findViewById(R.id.pass);
    moblie=(EditText) findViewById(R.id.mobile);
    email= (EditText) findViewById(R.id.email);
    placment= (EditText) findViewById(R.id.placement);
    Adress= (EditText) findViewById(R.id.adress);
    State = (EditText) findViewById(R.id.state);

    city=(EditText) findViewById(R.id.city);
    pincopde=(EditText) findViewById(R.id.pincode);
    counntry= (EditText) findViewById(R.id.country);

    plantype= (EditText) findViewById(R.id.plantype);


    mRegister = (Button)findViewById(R.id.registration); 
  //  session.createUserLoginSession(info.getCustomerID(),info.getName(),info.getMobile(),info.getEmailID(),info.getAccountType());
    mRegister.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


             SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME1);        

                request.addProperty("LoginCustomerID",login_id.getText().toString());
                request.addProperty("SponsorID",Suponser_id.getText().toString());
                request.addProperty("Name", name.getText().toString());
                request.addProperty("LoginPassword",pass.getText().toString() );
                request.addProperty("MobileNumber",smoblie=moblie.getText().toString());
                request.addProperty("Email",email.getText().toString() );
                request.addProperty("Placement", placment.getText().toString()); 
                request.addProperty("address1",  Adress.getText().toString());
                request.addProperty("StateID", State.getText().toString());
                request.addProperty("CityName",city.getText().toString());

                request.addProperty("Pincode",pincopde.getText().toString());


                request.addProperty("CountryID",counntry.getText().toString());
                request.addProperty("PlanType",plantype.getText().toString());



                //Declare the version of the SOAP request
                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

                envelope.setOutputSoapObject(request);
                envelope.dotNet = true;
                try {

                    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);

                    //this is the actual part that will call the webservice
                     androidHttpTransport.call(SOAP_ACTION1, envelope);


                    SoapObject result = (SoapObject)envelope.getResponse();  
                    Log.e("value of result", " result"+result);
                    if(result!= null)
                    {


                        Toast.makeText(getApplicationContext(), "successfully register ", 2000).show()  ;

                    }
                    else {

                        Toast.makeText(getApplicationContext(), "Try Again..", 2000).show() ;   
                    }

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



        }
    });
    }

  }

How to prevent "The play() request was interrupted by a call to pause()" error?

I think they updated the html5 video and deprecated some codecs. It worked for me after removing the codecs.

In the below example:

_x000D_
_x000D_
<video>_x000D_
    <source src="sample-clip.mp4" type="video/mp4; codecs='avc1.42E01E, mp4a.40.2'">_x000D_
    <source src="sample-clip.webm" type="video/webm; codecs='vp8, vorbis'"> _x000D_
</video>_x000D_
_x000D_
    must be changed to_x000D_
_x000D_
<video>_x000D_
    <source src="sample-clip.mp4" type="video/mp4">_x000D_
    <source src="sample-clip.webm" type="video/webm">_x000D_
</video>
_x000D_
_x000D_
_x000D_

Why is setTimeout(fn, 0) sometimes useful?

Some other cases where setTimeout is useful:

You want to break a long-running loop or calculation into smaller components so that the browser doesn't appear to 'freeze' or say "Script on page is busy".

You want to disable a form submit button when clicked, but if you disable the button in the onClick handler the form will not be submitted. setTimeout with a time of zero does the trick, allowing the event to end, the form to begin submitting, then your button can be disabled.

Initialization of an ArrayList in one line

public static <T> List<T> asList(T... a) {
    return new ArrayList<T>(a);
}

This is the implementation of Arrays.asList, so you could go with

ArrayList<String> arr = (ArrayList<String>) Arrays.asList("1", "2");

an htop-like tool to display disk activity in linux

You could use iotop. It doesn't rely on a kernel patch. It Works with stock Ubuntu kernel

There is a package for it in the Ubuntu repos. You can install it using

sudo apt-get install iotop

iotop

Call Python function from MATLAB

Like Daniel said you can run python commands directly from Matlab using the py. command. To run any of the libraries you just have to make sure Malab is running the python environment where you installed the libraries:

On a Mac:

  • Open a new terminal window;

  • type: which python (to find out where the default version of python is installed);

  • Restart Matlab;

  • type: pyversion('/anaconda2/bin/python'), in the command line (obviously replace with your path).
  • You can now run all the libraries in your default python installation.

For example:

py.sys.version;

py.sklearn.cluster.dbscan

Subtracting 2 lists in Python

Here's an alternative to list comprehensions. Map iterates through the list(s) (the latter arguments), doing so simulataneously, and passes their elements as arguments to the function (the first arg). It returns the resulting list.

import operator
map(operator.sub, a, b)

This code because has less syntax (which is more aesthetic for me), and apparently it's 40% faster for lists of length 5 (see bobince's comment). Still, either solution will work.

Hibernate throws MultipleBagFetchException - cannot simultaneously fetch multiple bags

We tried Set instead of List and it is a nightmare: when you add two new objects, equals() and hashCode() fail to distinguish both of them ! Because they don't have any id.

typical tools like Eclipse generate that kind of code from Database tables:

@Override
public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((id == null) ? 0 : id.hashCode());
    return result;
}

You may also read this article that explains properly how messed up JPA/Hibernate is. After reading this, I think this is the last time I use any ORM in my life.

I've also encounter Domain Driven Design guys that basically say ORM are a terrible thing.

TypeError: unhashable type: 'dict'

A possible solution might be to use the JSON dumps() method, so you can convert the dictionary to a string ---

import json

a={"a":10, "b":20}
b={"b":20, "a":10}
c = [json.dumps(a), json.dumps(b)]


set(c)
json.dumps(a) in c

Output -

set(['{"a": 10, "b": 20}'])
True

Docker is in volume in use, but there aren't any Docker containers

You can use these functions to brutally remove everything Docker related:

removecontainers() {
    docker stop $(docker ps -aq)
    docker rm $(docker ps -aq)
}

armageddon() {
    removecontainers
    docker network prune -f
    docker rmi -f $(docker images --filter dangling=true -qa)
    docker volume rm $(docker volume ls --filter dangling=true -q)
    docker rmi -f $(docker images -qa)
}

You can add those to your ~/Xrc file, where X is your shell interpreter (~/.bashrc if you're using bash) file and reload them via executing source ~/Xrc. Also, you can just copy paste them to the console and afterwards (regardless the option you took before to get the functions ready) just run:

armageddon

It's also useful for just general Docker clean up. Have in mind that this will also remove your images, not only your containers (either running or not) and your volumes of any kind.

Access to Image from origin 'null' has been blocked by CORS policy

Try to bypass CORS:

For Chrome: edit shortcut or with cmd: C:\Chrome.exe --disable-web-security

For Firefox: Open Firefox and type about:config into the URL bar. search for: security.fileuri.strict_origin_policy set to false

How can I combine flexbox and vertical scroll in a full-height app?

Flexbox spec editor here.

This is an encouraged use of flexbox, but there are a few things you should tweak for best behavior.

  • Don't use prefixes. Unprefixed flexbox is well-supported across most browsers. Always start with unprefixed, and only add prefixes if necessary to support it.

  • Since your header and footer aren't meant to flex, they should both have flex: none; set on them. Right now you have a similar behavior due to some overlapping effects, but you shouldn't rely on that unless you want to accidentally confuse yourself later. (Default is flex:0 1 auto, so they start at their auto height and can shrink but not grow, but they're also overflow:visible by default, which triggers their default min-height:auto to prevent them from shrinking at all. If you ever set an overflow on them, the behavior of min-height:auto changes (switching to zero rather than min-content) and they'll suddenly get squished by the extra-tall <article> element.)

  • You can simplify the <article> flex too - just set flex: 1; and you'll be good to go. Try to stick with the common values in https://drafts.csswg.org/css-flexbox/#flex-common unless you have a good reason to do something more complicated - they're easier to read and cover most of the behaviors you'll want to invoke.

AngularJS : Factory and Service?

$provide service

They are technically the same thing, it's actually a different notation of using the provider function of the $provide service.

  • If you're using a class: you could use the service notation.
  • If you're using an object: you could use the factory notation.

The only difference between the service and the factory notation is that the service is new-ed and the factory is not. But for everything else they both look, smell and behave the same. Again, it's just a shorthand for the $provide.provider function.

// Factory

angular.module('myApp').factory('myFactory', function() {

  var _myPrivateValue = 123;

  return {
    privateValue: function() { return _myPrivateValue; }
  };

});

// Service

function MyService() {
  this._myPrivateValue = 123;
}

MyService.prototype.privateValue = function() {
  return this._myPrivateValue;
};

angular.module('myApp').service('MyService', MyService);

Create a directory if it doesn't exist

You can use cstdlib

Although- http://www.cplusplus.com/articles/j3wTURfi/

#include <cstdlib>

const int dir= system("mkdir -p foo");
if (dir< 0)
{
     return;
}

you can also check if the directory exists already by using

#include <dirent.h>

Using ls to list directories and their total sizes

ncdu (ncurses du)

This awesome CLI utility allows you to easily find the large files and directories (recursive total size) interactively.

For example, from inside the root of a well known open source project we do:

sudo apt install ncdu
ncdu

The outcome its:

enter image description here

Then, I enter down and right on my keyboard to go into the /drivers folder, and I see:

enter image description here

ncdu only calculates file sizes recursively once at startup for the entire tree, so it is efficient.

"Total disk usage" vs "Apparent size" is analogous to du, and I have explained it at: why is the output of `du` often so different from `du -b`

Project homepage: https://dev.yorhel.nl/ncdu

Related questions:

Tested in Ubuntu 16.04.

Ubuntu list root

You likely want:

ncdu --exclude-kernfs -x /

where:

  • -x stops crossing of filesystem barriers
  • --exclude-kernfs skips special filesystems like /sys

MacOS 10.15.5 list root

To properly list root / on that system, I also needed --exclude-firmlinks, e.g.:

brew install ncdu
cd /
ncdu --exclude-firmlinks

otherwise it seemed to go into some link infinite loop, likely due to: https://www.swiftforensics.com/2019/10/macos-1015-volumes-firmlink-magic.html

The things we learn for love.

ncdu non-interactive usage

Another cool feature of ncdu is that you can first dump the sizes in a JSON format, and later reuse them.

For example, to generate the file run:

ncdu -o ncdu.json

and then examine it interactively with:

ncdu -f ncdu.json

This is very useful if you are dealing with a very large and slow filesystem like NFS.

This way, you can first export only once, which can take hours, and then explore the files, quit, explore again, etc.

The output format is just JSON, so it is easy to reuse it with other programs as well, e.g.:

ncdu -o -  | python -m json.tool | less

reveals a simple directory tree data structure:

[
    1,
    0,
    {
        "progname": "ncdu",
        "progver": "1.12",
        "timestamp": 1562151680
    },
    [
        {
            "asize": 4096,
            "dev": 2065,
            "dsize": 4096,
            "ino": 9838037,
            "name": "/work/linux-kernel-module-cheat/submodules/linux"
        },
        {
            "asize": 1513,
            "dsize": 4096,
            "ino": 9856660,
            "name": "Kbuild"
        },
        [
            {
                "asize": 4096,
                "dsize": 4096,
                "ino": 10101519,
                "name": "net"
            },
            [
                {
                    "asize": 4096,
                    "dsize": 4096,
                    "ino": 11417591,
                    "name": "l2tp"
                },
                {
                    "asize": 48173,
                    "dsize": 49152,
                    "ino": 11418744,
                    "name": "l2tp_core.c"
                },

Tested in Ubuntu 18.04.

Best practices for styling HTML emails

Campaign Monitor have an excellent support matrix detailing what's supported and what isn't among various mail clients.

You can use a service like Litmus to view how an email appears across several clients and whether they get caught by filters, etc.

Troubleshooting "Warning: session_start(): Cannot send session cache limiter - headers already sent"

Just replace session_start with this.

if (!session_id() && !headers_sent()) {
   session_start();
}  

You can put it anywhere, even at the end :) Works fine for me. $_SESSION is accessible as well.

What is a serialVersionUID and why should I use it?

serialVersionUID facilitates versioning of serialized data. Its value is stored with the data when serializing. When de-serializing, the same version is checked to see how the serialized data matches the current code.

If you want to version your data, you normally start with a serialVersionUID of 0, and bump it with every structural change to your class which alters the serialized data (adding or removing non-transient fields).

The built-in de-serialization mechanism (in.defaultReadObject()) will refuse to de-serialize from old versions of the data. But if you want to you can define your own readObject()-function which can read back old data. This custom code can then check the serialVersionUID in order to know which version the data is in and decide how to de-serialize it. This versioning technique is useful if you store serialized data which survives several versions of your code.

But storing serialized data for such a long time span is not very common. It is far more common to use the serialization mechanism to temporarily write data to for instance a cache or send it over the network to another program with the same version of the relevant parts of the codebase.

In this case you are not interested in maintaining backwards compatibility. You are only concerned with making sure that the code bases which are communicating indeed have the same versions of relevant classes. In order to facilitate such a check, you must maintain the serialVersionUID just like before and not forget to update it when making changes to your classes.

If you do forget to update the field, you might end up with two different versions of a class with different structure but with the same serialVersionUID. If this happens, the default mechanism (in.defaultReadObject()) will not detect any difference, and try to de-serialize incompatible data. Now you might end up with a cryptic runtime error or silent failure (null fields). These types of errors might be hard to find.

So to help this usecase, the Java platform offers you a choice of not setting the serialVersionUID manually. Instead, a hash of the class structure will be generated at compile-time and used as id. This mechanism will make sure that you never have different class structures with the same id, and so you will not get these hard-to-trace runtime serialization failures mentioned above.

But there is a backside to the auto-generated id strategy. Namely that the generated ids for the same class might differ between compilers (as mentioned by Jon Skeet above). So if you communicate serialized data between code compiled with different compilers, it is recommended to maintain the ids manually anyway.

And if you are backwards-compatible with your data like in the first use case mentioned, you also probably want to maintain the id yourself. This in order to get readable ids and have greater control over when and how they change.

Error Dropping Database (Can't rmdir '.test\', errno: 17)

In my case I didn't see any tables under my database on phpMyAdmin I am using Wamp server but when I checked the directory under C:\wamp\bin\mysql\mysql5.6.12\data I found this employed.ibd when I deleted this file manually I was able to drop the database from phpMyAdmin smoothly without any problems.

LINQ Using Max() to select a single row

You can also do:

(from u in table
orderby u.Status descending
select u).Take(1);

start MySQL server from command line on Mac OS Lion

Simply:

mysql.server start

mysql.server stop

mysql.server restart

How to get all selected values of a multiple select box?

Riot js code

this.GetOpt=()=>{

let opt=this.refs.ni;

this.logger.debug("Options length "+opt.options.length);

for(let i=0;i<=opt.options.length;i++)
{
  if(opt.options[i].selected==true)
    this.logger.debug(opt.options[i].value);
}
};

//**ni** is a name of HTML select option element as follows
//**HTML code**
<select multiple ref="ni">
  <option value="">---Select---</option>
  <option value="Option1 ">Gaming</option>
  <option value="Option2">Photoshoot</option>
</select>

How to change JFrame icon

Unfortunately, the above solution did not work for Jython Fiji plugin. I had to use getProperty to construct the relative path dynamically.

Here's what worked for me:

import java.lang.System.getProperty;
import javax.swing.JFrame;
import javax.swing.ImageIcon;

frame = JFrame("Test")
icon = ImageIcon(getProperty('fiji.dir') + '/path/relative2Fiji/icon.png')
frame.setIconImage(icon.getImage());
frame.setVisible(True)

java.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;

java.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;

That method was added in Servlet 2.5.

So this problem can have at least 3 causes:

  1. The servlet container does not support Servlet 2.5.
  2. The web.xml is not declared conform Servlet 2.5 or newer.
  3. The webapp's runtime classpath is littered with servlet container specific JAR files of a different servlet container make/version which does not support Servlet 2.5.

To solve it,

  1. Make sure that your servlet container supports at least Servlet 2.5. That are at least Tomcat 6, Glassfish 2, JBoss AS 4.1, etcetera. Tomcat 5.5 for example supports at highest Servlet 2.4. If you can't upgrade Tomcat, then you'd need to downgrade Spring to a Servlet 2.4 compatible version.
  2. Make sure that the root declaration of web.xml complies Servlet 2.5 (or newer, at least the highest whatever your target runtime supports). For an example, see also somewhere halfway our servlets wiki page.
  3. Make sure that you don't have any servlet container specific libraries like servlet-api.jar or j2ee.jar in /WEB-INF/lib or even worse, the JRE/lib or JRE/lib/ext. They do not belong there. This is a pretty common beginner's mistake in an attempt to circumvent compilation errors in an IDE, see also How do I import the javax.servlet API in my Eclipse project?.

Storing files in SQL Server

There's a really good paper by Microsoft Research called To Blob or Not To Blob.

Their conclusion after a large number of performance tests and analysis is this:

  • if your pictures or document are typically below 256K in size, storing them in a database VARBINARY column is more efficient

  • if your pictures or document are typically over 1 MB in size, storing them in the filesystem is more efficient (and with SQL Server 2008's FILESTREAM attribute, they're still under transactional control and part of the database)

  • in between those two, it's a bit of a toss-up depending on your use

If you decide to put your pictures into a SQL Server table, I would strongly recommend using a separate table for storing those pictures - do not store the employee photo in the employee table - keep them in a separate table. That way, the Employee table can stay lean and mean and very efficient, assuming you don't always need to select the employee photo, too, as part of your queries.

For filegroups, check out Files and Filegroup Architecture for an intro. Basically, you would either create your database with a separate filegroup for large data structures right from the beginning, or add an additional filegroup later. Let's call it "LARGE_DATA".

Now, whenever you have a new table to create which needs to store VARCHAR(MAX) or VARBINARY(MAX) columns, you can specify this file group for the large data:

 CREATE TABLE dbo.YourTable
     (....... define the fields here ......)
     ON Data                   -- the basic "Data" filegroup for the regular data
     TEXTIMAGE_ON LARGE_DATA   -- the filegroup for large chunks of data

Check out the MSDN intro on filegroups, and play around with it!

How to prevent background scrolling when Bootstrap 3 modal open on mobile browsers?

I tried the accepted answer which prevented the body from scrolling but had the issue of scrolling to the top. This should solve both issues.

As a side note, it appears overflow:hidden doesn't work on body for iOS Safari only as iOS Chrome works fine.

var scrollPos = 0;

$('.modal')
    .on('show.bs.modal', function (){
        scrollPos = $('body').scrollTop();
        $('body').css({
            overflow: 'hidden',
            position: 'fixed',
            top : -scrollPos
        });
    })
    .on('hide.bs.modal', function (){
        $('body').css({
            overflow: '',
            position: '',
            top: ''
        }).scrollTop(scrollPos);
    });

Check if PHP session has already started

you can do this, and it's really easy.

if (!isset($_SESSION)) session_start();

Hope it helps :)

Displaying Total in Footer of GridView and also Add Sum of columns(row vise) in last Column

protected void gvBill_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.DataRow)

            Total += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "InvMstAmount"));
        else if (e.Row.RowType == DataControlRowType.Footer)

            e.Row.Cells[7].Text = String.Format("{0:0}", "<b>" + Total + "</b>");
    }

enter image description here

Is there a command line command for verifying what version of .NET is installed

This is working for me:

@echo off
SETLOCAL ENABLEEXTENSIONS

echo Verify .Net Framework Version

for /f "delims=" %%I in ('dir /B /A:D %windir%\Microsoft.NET\Framework') do (
    for /f "usebackq tokens=1,3 delims= " %%A in (`reg query "HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\%%I" 2^>nul ^| findstr Install`) do (
        if %%A==Install (
            if %%B==0x1 (
                echo %%I
            )
        )
    )
)

echo Do you see version v4.5.2 or greater in the list?

pause

ENDLOCAL 

The 2^>nul redirects errors to vapor.

iPhone Navigation Bar Title text color

After encountering the same problem (as others) of the label that moves when we insert a button in the navBar (in my case i have a spinner that i replace with a button when the date is loaded), the above solutions didn't work for me, so here is what worked and kept the label at the same place all the time:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
    // this will appear as the title in the navigation bar
    //CGRect frame = CGRectMake(0, 0, [self.title sizeWithFont:[UIFont boldSystemFontOfSize:20.0]].width, 44);
   CGRect frame = CGRectMake(0, 0, 180, 44);
    UILabel *label = [[[UILabel alloc] initWithFrame:frame] autorelease];



    label.backgroundColor = [UIColor clearColor];
    label.font = [UIFont boldSystemFontOfSize:20.0];
    label.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
    label.textAlignment = UITextAlignmentCenter;
    label.textColor = [UIColor yellowColor];
    self.navigationItem.titleView = label;
    label.text = NSLocalizedString(@"Latest Questions", @"");
    [label sizeToFit];
}

return self;

Reset Excel to default borders

you just need to change the line color and you can apply it without problem

enter image description here

Open a Web Page in a Windows Batch FIle

Unfortunately, the best method to approach this is to use Internet Explorer as it's a browser that is guaranteed to be on Windows based machines. This will also bring compatibility of other users which might have alternative browsers such as Firefox, Chrome, Opera..etc,

start "iexplore.exe" http://www.website.com

Checking if a collection is null or empty in Groovy

There is indeed a Groovier Way.

if(members){
    //Some work
}

does everything if members is a collection. Null check as well as empty check (Empty collections are coerced to false). Hail Groovy Truth. :)

How can I search Git branches for a file or directory?

You could use gitk --all and search for commits "touching paths" and the pathname you are interested in.

GROUP BY and COUNT in PostgreSQL

I think you just need COUNT(DISTINCT post_id) FROM votes.

See "4.2.7. Aggregate Expressions" section in http://www.postgresql.org/docs/current/static/sql-expressions.html.

EDIT: Corrected my careless mistake per Erwin's comment.

How do you check if a certain index exists in a table?

-- Delete index if exists
IF EXISTS(SELECT TOP 1 1 FROM sys.indexes indexes INNER JOIN sys.objects 
objects ON indexes.object_id = objects.object_id WHERE indexes.name 
='Your_Index_Name' AND objects.name = 'Your_Table_Name')
BEGIN
    PRINT 'DROP INDEX [Your_Index_Name] ON [dbo].[Your_Table_Name]'
    DROP INDEX [our_Index_Name] ON [dbo].[Your_Table_Name]
END
GO

What does Html.HiddenFor do?

And to consume the hidden ID input back on your Edit action method:

[HttpPost]
public ActionResult Edit(FormCollection collection)
{
    ViewModel.ID = Convert.ToInt32(collection["ID"]);
}

Google Maps: Auto close open InfoWindows?

There is a close() function for InfoWindows. Just keep track of the last opened window, and call the close function on it when a new window is created.

Finding duplicate rows in SQL Server

Select * from (Select orgName,id,
ROW_NUMBER() OVER(Partition By OrgName ORDER by id DESC) Rownum
From organizations )tbl Where Rownum>1

So the records with rowum> 1 will be the duplicate records in your table. ‘Partition by’ first group by the records and then serialize them by giving them serial nos. So rownum> 1 will be the duplicate records which could be deleted as such.

What should be in my .gitignore for an Android Studio project?

It's the best way to generate .gitignore via here

How to set Spinner Default by its Value instead of Position?

Compare string with value from index

private void selectSpinnerValue(Spinner spinner, String myString)
     {
         int index = 0;
         for(int i = 0; i < spinner.getCount(); i++){
             if(spinner.getItemAtPosition(i).toString().equals(myString)){
                 spinner.setSelection(i);
                 break;
             }
         }
     }

Multiple files upload (Array) with CodeIgniter 2.0

There is no predefined method available in codeigniter to upload multiple file at one time but you can send file in array and upload them one by one

here is refer: Here is best option to upload multiple file in codeigniter 3.0.1 with preview https://codeaskbuzz.com/how-to-upload-multiple-file-in-codeigniter-framework/

How can I check if a scrollbar is visible?

The first solution above works only in IE The second solution above works only in FF

This combination of both functions works in both browsers:

//Firefox Only!!
if ($(document).height() > $(window).height()) {
    // has scrollbar
    $("#mtc").addClass("AdjustOverflowWidth");
    alert('scrollbar present - Firefox');
} else {
    $("#mtc").removeClass("AdjustOverflowWidth");
}

//Internet Explorer Only!!
(function($) {
    $.fn.hasScrollBar = function() {
        return this.get(0).scrollHeight > this.innerHeight();
    }
})(jQuery);
if ($('#monitorWidth1').hasScrollBar()) {
    // has scrollbar
    $("#mtc").addClass("AdjustOverflowWidth");
    alert('scrollbar present - Internet Exploder');
} else {
    $("#mtc").removeClass("AdjustOverflowWidth");
}?
  • Wrap in a document ready
  • monitorWidth1 : the div where the overflow is set to auto
  • mtc : a container div inside monitorWidth1
  • AdjustOverflowWidth : a css class applied to the #mtc div when the Scrollbar is active *Use the alert to test cross browser, and then comment out for final production code.

HTH

How can I execute PHP code from the command line?

On the command line:

php -i | grep sourceguardian

If it's there, then you'll get some text. If not, you won't get a thing.

Converting string to byte array in C#

You could use MemoryMarshal API to perform very fast and efficient conversion. String will implicitly be cast to ReadOnlySpan<byte>, as MemoryMarshal.Cast accepts either Span<byte> or ReadOnlySpan<byte> as an input parameter.

public static class StringExtensions
{
    public static byte[] ToByteArray(this string s) => s.ToByteSpan().ToArray(); //  heap allocation, use only when you cannot operate on spans
    public static ReadOnlySpan<byte> ToByteSpan(this string s) => MemoryMarshal.Cast<char, byte>(s);
}

Following benchmark shows the difference:

Input: "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,"

|                       Method |       Mean |     Error |    StdDev |  Gen 0 | Gen 1 | Gen 2 | Allocated |
|----------------------------- |-----------:|----------:|----------:|-------:|------:|------:|----------:|
| UsingEncodingUnicodeGetBytes | 160.042 ns | 3.2864 ns | 6.4099 ns | 0.0780 |     - |     - |     328 B |
| UsingMemoryMarshalAndToArray |  31.977 ns | 0.7177 ns | 1.5753 ns | 0.0781 |     - |     - |     328 B |
|           UsingMemoryMarshal |   1.027 ns | 0.0565 ns | 0.1630 ns |      - |     - |     - |         - |

How to find the statistical mode?

Mode can't be useful in every situations. So the function should address this situation. Try the following function.

Mode <- function(v) {
  # checking unique numbers in the input
  uniqv <- unique(v)
  # frquency of most occured value in the input data
  m1 <- max(tabulate(match(v, uniqv)))
  n <- length(tabulate(match(v, uniqv)))
  # if all elements are same
  same_val_check <- all(diff(v) == 0)
  if(same_val_check == F){
    # frquency of second most occured value in the input data
    m2 <- sort(tabulate(match(v, uniqv)),partial=n-1)[n-1]
    if (m1 != m2) {
      # Returning the most repeated value
      mode <- uniqv[which.max(tabulate(match(v, uniqv)))]
    } else{
      mode <- "Two or more values have same frequency. So mode can't be calculated."
    }
  } else {
    # if all elements are same
    mode <- unique(v)
  }
  return(mode)
}

Output,

x1 <- c(1,2,3,3,3,4,5)
Mode(x1)
# [1] 3

x2 <- c(1,2,3,4,5)
Mode(x2)
# [1] "Two or more varibles have same frequency. So mode can't be calculated."

x3 <- c(1,1,2,3,3,4,5)
Mode(x3)
# [1] "Two or more values have same frequency. So mode can't be calculated."

Where is the default log location for SharePoint/MOSS?

In SharePoint 2013 they are stored in:

%COMMONPROGRAMFILES%\Microsoft Shared\web server extensions\15\LOGS

How to find integer array size in java

There is no method call size() with array. you can use array.length

Where is my .vimrc file?

From cmd (Windows):

C\Users\You> `vim foo.txt`

Now in Vim, enter command mode by typing: ":" (i.e. Shift + ;)

:tabedit $HOME/.vimrc

Does a VPN Hide my Location on Android?

Your question can be conveniently divided into several parts:

Does a VPN hide location? Yes, he is capable of this. This is not about GPS determining your location. If you try to change the region via VPN in an application that requires GPS access, nothing will work. However, sites define your region differently. They get an IP address and see what country or region it belongs to. If you can change your IP address, you can change your region. This is exactly what VPNs can do.

How to hide location on Android? There is nothing difficult in figuring out how to set up a VPN on Android, but a couple of nuances still need to be highlighted. Let's start with the fact that not all Android VPNs are created equal. For example, VeePN outperforms many other services in terms of efficiency in circumventing restrictions. It has 2500+ VPN servers and a powerful IP and DNS leak protection system.

You can easily change the location of your Android device by using a VPN. Follow these steps for any device model (Samsung, Sony, Huawei, etc.):

  1. Download and install a trusted VPN.

  2. Install the VPN on your Android device.

  3. Open the application and connect to a server in a different country.

  4. Your Android location will now be successfully changed!

Is it legal? Yes, changing your location on Android is legal. Likewise, you can change VPN settings in Microsoft Edge on your PC, and all this is within the law. VPN allows you to change your IP address, safeguarding your privacy and protecting your actual location from being exposed. However, VPN laws may vary from country to country. There are restrictions in some regions.

Brief summary: Yes, you can change your region on Android and a VPN is a necessary assistant for this. It's simple, safe and legal. Today, VPN is the best way to change the region and unblock sites with regional restrictions.

How to change Navigation Bar color in iOS 7?

Doing what the original question asked—to get the old Twitter's Nav Bar look, blue background with white text—is very easy to do just using the Interface Builder in Xcode.

  • Using the Document Outline, select your Navigation Bar.
  • In the Attributes Inspector, in the Navigation Bar group, change the Style from Default to Black. This changes the background colour of the Navigation and Status bars to black, and their text to white. So the battery and other icons and text in the status bar will look white when the app is running.
  • In the same Navigation Bar group, change the Bar Tint to the colour of your liking.
  • If you have Bar Button items in your Navigation Bar, those will still show their text in the default blue colour, so in the Attributes Inspector, View group, change the Tint to White Colour.

That should get you what you want. Here is a screenshot that would make it easier to see where to make the changes.

Where to make the necessary changes, including the result in iOS Simulator

Note that changing only the Bar Tint doesn't change the text colour in the Navigation Bar or the Status Bar. The Style also needs to be changed.

What is the problem with shadowing names defined in outer scopes?

A good workaround in some cases may be to move the variables and code to another function:

def print_data(data):
    print data

def main():
    data = [4, 5, 6]
    print_data(data)

main()

How to import a class from default package

  1. Create a new package.
  2. Move your files from the default package to the new one.

Connection timeout for SQL server

Hmmm...

As Darin said, you can specify a higher connection timeout value, but I doubt that's really the issue.

When you get connection timeouts, it's typically a problem with one of the following:

  1. Network configuration - slow connection between your web server/dev box and the SQL server. Increasing the timeout may correct this, but it'd be wise to investigate the underlying problem.

  2. Connection string. I've seen issues where an incorrect username/password will, for some reason, give a timeout error instead of a real error indicating "access denied." This shouldn't happen, but such is life.

  3. Connection String 2: If you're specifying the name of the server incorrectly, or incompletely (for instance, mysqlserver instead of mysqlserver.webdomain.com), you'll get a timeout. Can you ping the server using the server name exactly as specified in the connection string from the command line?

  4. Connection string 3 : If the server name is in your DNS (or hosts file), but the pointing to an incorrect or inaccessible IP, you'll get a timeout rather than a machine-not-found-ish error.

  5. The query you're calling is timing out. It can look like the connection to the server is the problem, but, depending on how your app is structured, you could be making it all the way to the stage where your query is executing before the timeout occurs.

  6. Connection leaks. How many processes are running? How many open connections? I'm not sure if raw ADO.NET performs connection pooling, automatically closes connections when necessary ala Enterprise Library, or where all that is configured. This is probably a red herring. When working with WCF and web services, though, I've had issues with unclosed connections causing timeouts and other unpredictable behavior.

Things to try:

  1. Do you get a timeout when connecting to the server with SQL Management Studio? If so, network config is likely the problem. If you do not see a problem when connecting with Management Studio, the problem will be in your app, not with the server.

  2. Run SQL Profiler, and see what's actually going across the wire. You should be able to tell if you're really connecting, or if a query is the problem.

  3. Run your query in Management Studio, and see how long it takes.

Good luck!

Are there benefits of passing by pointer over passing by reference in C++?

Most of the answers here fail to address the inherent ambiguity in having a raw pointer in a function signature, in terms of expressing intent. The problems are the following:

  • The caller does not know whether the pointer points to a single objects, or to the start of an "array" of objects.

  • The caller does not know whether the pointer "owns" the memory it points to. IE, whether or not the function should free up the memory. (foo(new int) - Is this a memory leak?).

  • The caller does not know whether or not nullptr can be safely passed into the function.

All of these problems are solved by references:

  • References always refer to a single object.

  • References never own the memory they refer to, they are merely a view into memory.

  • References can't be null.

This makes references a much better candidate for general use. However, references aren't perfect - there are a couple of major problems to consider.

  • No explicit indirection. This is not a problem with a raw pointer, as we have to use the & operator to show that we are indeed passing a pointer. For example, int a = 5; foo(a); It is not clear at all here that a is being passed by reference and could be modified.
  • Nullability. This weakness of pointers can also be a strength, when we actually want our references to be nullable. Seeing as std::optional<T&> isn't valid (for good reasons), pointers give us that nullability you want.

So it seems that when we want a nullable reference with explicit indirection, we should reach for a T* right? Wrong!

Abstractions

In our desperation for nullability, we may reach for T*, and simply ignore all of the shortcomings and semantic ambiguity listed earlier. Instead, we should reach for what C++ does best: an abstraction. If we simply write a class that wraps around a pointer, we gain the expressiveness, as well as the nullability and explicit indirection.

template <typename T>
struct optional_ref {
  optional_ref() : ptr(nullptr) {}
  optional_ref(T* t) : ptr(t) {}
  optional_ref(std::nullptr_t) : ptr(nullptr) {}

  T& get() const {
    return *ptr;
  }

  explicit operator bool() const {
    return bool(ptr);
  }

private:
  T* ptr;
};

This is the most simple interface I could come up with, but it does the job effectively. It allows for initializing the reference, checking whether a value exists and accessing the value. We can use it like so:

void foo(optional_ref<int> x) {
  if (x) {
    auto y = x.get();
    // use y here
  }
}

int x = 5;
foo(&x); // explicit indirection here
foo(nullptr); // nullability

We have acheived our goals! Let's now see the benefits, in comparison to the raw pointer.

  • The interface shows clearly that the reference should only refer to one object.
  • Clearly it does not own the memory it refers to, as it has no user defined destructor and no method to delete the memory.
  • The caller knows nullptr can be passed in, since the function author explicitly is asking for an optional_ref

We could make the interface more complex from here, such as adding equality operators, a monadic get_or and map interface, a method that gets the value or throws an exception, constexpr support. That can be done by you.

In conclusion, instead of using raw pointers, reason about what those pointers actually mean in your code, and either leverage a standard library abstraction or write your own. This will improve your code significantly.

how to run python files in windows command prompt?

First go to the directory where your python script is present by using-

cd path/to/directory

then simply do:

python file_name.py

Only detect click event on pseudo-element

No,but you can do like this

In html file add this section

<div class="arrow">
</div>

In css you can do like this

p div.arrow {
    content: '';
    position: absolute;
    left:100%;
    width: 10px;
    height: 100%;
    background-color: red;
} 

Hope it will help you

Facebook Open Graph not clearing cache

If you have many pages and don't want to refresh them manually - you can do it automatically.

Lets say you have user profile page with photo:

$url = 'http://'.$_SERVER['HTTP_HOST'].'/'.$user_profile;
$user_photo = 'http://'.$_SERVER['HTTP_HOST'].'/'.$user_photo;

<meta property="og:url" content="<?php echo $url; ?>"/>
<meta property="og:image" content="<?php echo $user_photo; ?>"

Just add this to your page:

// with jQuery
$.post(
    'https://graph.facebook.com',
    {
        id: '<?php echo $url; ?>',
        scrape: true
    },
    function(response){
        console.log(response);
    }
);

// with "vanilla" javascript
var fbxhr = new XMLHttpRequest();
fbxhr.open("POST", "https://graph.facebook.com", true);
fbxhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
fbxhr.send("id=<?php echo $url; ?>&scrape=true");

This will refresh Facebook cache. If you use the jQuery solution, have a look at "response" in console.log - you will find there "updated_time" field and other useful information.

JS map return object

If you want to alter the original objects, then a simple Array#forEach will do:

rockets.forEach(function(rocket) {
    rocket.launches += 10;
});

If you want to keep the original objects unaltered, then use Array#map and copy the objects using Object#assign:

var newRockets = rockets.forEach(function(rocket) {
    var newRocket = Object.assign({}, rocket);
    newRocket.launches += 10;
    return newRocket;
});

Which data type for latitude and longitude?

In PostGIS, for points with latitude and longitude there is geography datatype.

To add a column:

alter table your_table add column geog geography;

To insert data:

insert into your_table (geog) values ('SRID=4326;POINT(longitude latitude)');

4326 is Spatial Reference ID that says it's data in degrees longitude and latitude, same as in GPS. More about it: http://epsg.io/4326

Order is Longitude, Latitude - so if you plot it as the map, it is (x, y).

To find closest point you need first to create spatial index:

create index on your_table using gist (geog);

and then request, say, 5 closest to a given point:

select * 
from your_table 
order by geog <-> 'SRID=4326;POINT(lon lat)' 
limit 5;

LinearLayout not expanding inside a ScrollView

I know this post is very old, For those who don't want to use android:fillViewport="true" because it sometimes doesn't bring up the edittext above keyboard. Use Relative layout instead of LinearLayout it solves the purpose.

Which Ruby version am I really running?

The ruby version 1.8.7 seems to be your system ruby.

Normally you can choose the ruby version you'd like, if you are using rvm with following. Simple change into your directory in a new terminal and type in:

rvm use 2.0.0

You can find more details about rvm here: http://rvm.io Open the website and scroll down, you will see a few helpful links. "Setting up default rubies" for example could help you.

Update: To set the ruby as default:

rvm use 2.0.0 --default

How to check if element is visible after scrolling?

You can make use of jquery plugin "onScreen" to check if the element is in the current viewport when you scroll. The plugin sets the ":onScreen" of the selector to true when the selector appears on the screen. This is the link for the plugin which you can include in your project. "http://benpickles.github.io/onScreen/jquery.onscreen.min.js"

You can try the below example which works for me.

$(document).scroll(function() {
    if($("#div2").is(':onScreen')) {
        console.log("Element appeared on Screen");
        //do all your stuffs here when element is visible.
    }
    else {
        console.log("Element not on Screen");
        //do all your stuffs here when element is not visible.
    }
});

HTML Code:

<div id="div1" style="width: 400px; height: 1000px; padding-top: 20px; position: relative; top: 45px"></div> <br>
<hr /> <br>
<div id="div2" style="width: 400px; height: 200px"></div>

CSS:

#div1 {
    background-color: red;
}
#div2 {
    background-color: green;
}

How do I horizontally center an absolute positioned element inside a 100% width div?

You will have to assign both left and right property 0 value for margin: auto to center the logo.

So in this case:

#logo {
  background:red;
  height:50px;
  position:absolute;
  width:50px;
  left: 0;
  right: 0;
  margin: 0 auto;
}

You might also want to set position: relative for #header.

This works because, setting left and right to zero will horizontally stretch the absolutely positioned element. Now magic happens when margin is set to auto. margin takes up all the extra space(equally on each side) leaving the content to its specified width. This results in content becoming center aligned.

How to show progress dialog in Android?

You better try with AsyncTask

Sample code -

private class YourAsyncTask extends AsyncTask<Void, Void, Void> {
    private ProgressDialog dialog;

    public YourAsyncTask(MyMainActivity activity) {
        dialog = new ProgressDialog(activity);
    }

    @Override
    protected void onPreExecute() {
        dialog.setMessage("Doing something, please wait.");
        dialog.show();
    }
    @Override
    protected Void doInBackground(Void... args) {
        // do background work here
        return null;
    }
    @Override
    protected void onPostExecute(Void result) {
         // do UI work here
        if (dialog.isShowing()) {
            dialog.dismiss();
        }
    }
}

Use the above code in your Login Button Activity. And, do the stuff in doInBackground and onPostExecute

Update:

ProgressDialog is integrated with AsyncTask as you said your task takes time for processing.

Update:

ProgressDialog class was deprecated as of API 26

Windows service start failure: Cannot start service from the command line or debugger

Watch this video, I had the same question. He shows you how to debug the service as well.

Here are his instructions using the basic C# Windows Service template in Visual Studio 2010/2012.

You add this to the Service1.cs file:

public void onDebug()
{
    OnStart(null);
}

You change your Main() to call your service this way if you are in the DEBUG Active Solution Configuration.

static void Main()
{
    #if DEBUG
    //While debugging this section is used.
    Service1 myService = new Service1();
    myService.onDebug();
    System.Threading.Thread.Sleep(System.Threading.Timeout.Infinite);

    #else
    //In Release this section is used. This is the "normal" way.
    ServiceBase[] ServicesToRun;
    ServicesToRun = new ServiceBase[] 
    { 
        new Service1() 
    };
    ServiceBase.Run(ServicesToRun);
    #endif
}

Keep in mind that while this is an awesome way to debug your service. It doesn't call OnStop() unless you explicitly call it similar to the way we called OnStart(null) in the onDebug() function.

Updating and committing only a file's permissions using git version control

Not working for me.

The mode is true, the file perms have been changed, but git says there's no work to do.

git init
git add dir/file
chmod 440 dir/file
git commit -a

The problem seems to be that git recognizes only certain permission changes.

How to get row count in sqlite using Android?

c.getCount() returns 1 because the cursor contains a single row (the one with the real COUNT(*)). The count you need is the int value of first row in cursor.

public int getTaskCount(long tasklist_Id) {

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor= db.rawQuery(
        "SELECT COUNT (*) FROM " + TABLE_TODOTASK + " WHERE " + KEY_TASK_TASKLISTID + "=?",
         new String[] { String.valueOf(tasklist_Id) }
    );
    int count = 0;
    if(null != cursor)
        if(cursor.getCount() > 0){
          cursor.moveToFirst();    
          count = cursor.getInt(0);
        }
        cursor.close();
    }

    db.close();
    return count;
}   

How can I get a list of repositories 'apt-get' is checking?

It's not a format suitable for blindly copying to another machine, but users who wish to work out whether they've added a repository yet or not (like I did), you can just do:

sudo apt update

When apt is updating, it outputs a list of repositories it fetches. It seems obvious, but I've just realised what the GET URLs are that it spits out.

The following awk-based expression could be used to generate a sources.list file:

 cat /tmp/apt-update.txt | awk '/http/ { gsub("/", " ", $3); gsub("^\s\*$", "main", $3); printf("deb "); if($4 ~ "^[a-z0-9]$") printf("[arch=" $4 "] "); print($2 " " $3) }' | sort | uniq

Alternatively, as other answers suggest, you could just cat all the pre-existing sources like this:

cat /etc/apt/sources.list /etc/apt/sources.list.d/*

Since the disabled repositories are commented out with hash, this should work as intended.

Remove large .pack file created by git

this is more of a handy solution than a coding one. zip the file. Open the zip in file view format (different from unzipping). Delete the .pack file. Unzip and replace the folder. Works like a charm!

Regex Email validation

The following code is based on Microsoft's Data annotations implementation on github and I think it's the most complete validation for emails:

public static Regex EmailValidation()
{
    const string pattern = @"^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$";
    const RegexOptions options = RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture;

    // Set explicit regex match timeout, sufficient enough for email parsing
    // Unless the global REGEX_DEFAULT_MATCH_TIMEOUT is already set
    TimeSpan matchTimeout = TimeSpan.FromSeconds(2);

    try
    {
        if (AppDomain.CurrentDomain.GetData("REGEX_DEFAULT_MATCH_TIMEOUT") == null)
        {
            return new Regex(pattern, options, matchTimeout);
        }
    }
    catch
    {
        // Fallback on error
    }

    // Legacy fallback (without explicit match timeout)
    return new Regex(pattern, options);
}

Meaning of @classmethod and @staticmethod for beginner?

When to use each

@staticmethod function is nothing more than a function defined inside a class. It is callable without instantiating the class first. It’s definition is immutable via inheritance.

  • Python does not have to instantiate a bound-method for object.
  • It eases the readability of the code: seeing @staticmethod, we know that the method does not depend on the state of object itself;

@classmethod function also callable without instantiating the class, but its definition follows Sub class, not Parent class, via inheritance, can be overridden by subclass. That’s because the first argument for @classmethod function must always be cls (class).

  • Factory methods, that are used to create an instance for a class using for example some sort of pre-processing.
  • Static methods calling static methods: if you split a static methods in several static methods, you shouldn't hard-code the class name but use class methods

here is good link to this topic.