SyntaxFix

Programs & Examples On #Hydra

Is JVM ARGS '-Xms1024m -Xmx2048m' still useful in Java 8?

Due to PermGen removal some options were removed (like -XX:MaxPermSize), but options -Xms and -Xmx work in Java 8. It's possible that under Java 8 your application simply needs somewhat more memory. Try to increase -Xmx value. Alternatively you can try to switch to G1 garbage collector using -XX:+UseG1GC.

Note that if you use any option which was removed in Java 8, you will see a warning upon application start:

$ java -XX:MaxPermSize=128M -version
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128M; support was removed in 8.0
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

How to hide form code from view code/inspect element browser?

You can use this code -

Block Right Click -

<body oncontextmenu="return false;">

Block Keys - You should use this on the upper of the body tag. (use in the head tag)

<script>

    document.onkeydown = function (e) {
        if (event.keyCode == 123) {
            return false;
        }
        if (e.ctrlKey && e.shiftKey && (e.keyCode == 'I'.charCodeAt(0) || e.keyCode == 'i'.charCodeAt(0))) {
            return false;
        }
        if (e.ctrlKey && e.shiftKey && (e.keyCode == 'C'.charCodeAt(0) || e.keyCode == 'c'.charCodeAt(0))) {
            return false;
        }
        if (e.ctrlKey && e.shiftKey && (e.keyCode == 'J'.charCodeAt(0) || e.keyCode == 'j'.charCodeAt(0))) {
            return false;
        }
        if (e.ctrlKey && (e.keyCode == 'U'.charCodeAt(0) || e.keyCode == 'u'.charCodeAt(0))) {
            return false;
        }
        if (e.ctrlKey && (e.keyCode == 'S'.charCodeAt(0) || e.keyCode == 's'.charCodeAt(0))) {
            return false;
        }
    }
</script>

How can I open a .tex file?

A .tex file should be a LaTeX source file.

If this is the case, that file contains the source code for a LaTeX document. You can open it with any text editor (notepad, notepad++ should work) and you can view the source code. But if you want to view the final formatted document, you need to install a LaTeX distribution and compile the .tex file.

Of course, any program can write any file with any extension, so if this is not a LaTeX document, then we can't know what software you need to install to open it. Maybe if you upload the file somewhere and link it in your question we can see the file and provide more help to you.

Yes, this is the source code of a LaTeX document. If you were able to paste it here, then you are already viewing it. If you want to view the compiled document, you need to install a LaTeX distribution. You can try to install MiKTeX then you can use that to compile the document to a .pdf file.

You can also check out this question and answer for how to do it: How to compile a LaTeX document?

Also, there's an online LaTeX editor and you can paste your code in there to preview the document: https://www.overleaf.com/.

Adding an img element to a div with javascript

 
document.getElementById("placehere").appendChild(elem);

not

document.getElementById("placehere").appendChild("elem");

and use the below to set the source

elem.src = 'images/hydrangeas.jpg';

java.sql.SQLException: Fail to convert to internal representation

Your data types are mismatched when you are retrieving the field values. Check your code and ensure that for each field that you are retrieving that the java object matches that type. For example, retrieving a date into and int. If you are doing a select * then it is possible a change in the fields of the table has happened causing this error to occur. Your SQL should only select the fields you specifically want in order to avoid this error.

Hope this helps.

Keytool is not recognized as an internal or external command

Execute following command:

set PATH="C:\Program Files (x86)\Java\jre7"

(whichever JRE exists in case of 64bit).

Because your Java Path is not set so you can just do this at command line and then execute the keytool import command.

Delete files in subfolder using batch script

You can use the /s switch for del to delete in subfolders as well.

Example

del D:\test\*.* /s

Would delete all files under test including all files in all subfolders.

To remove folders use rd, same switch applies.

rd D:\test\folder /s /q

rd doesn't support wildcards * though so if you want to recursively delete all subfolders under the test directory you can use a for loop.

for /r /d D:\test %a in (*) do rd %a /s /q

If you are using the for option in a batch file remember to use 2 %'s instead of 1.

Customize list item bullets using CSS

This method moves the disc out of the text flow where the original disc was, but is adjustable.

ul{
    list-style-type: none;
    
    li{ 
        position: relative;
      }
    li:before {
        position: absolute;
        top: .1rem;
        left: -.8em;
        content: '\2022';
        font-size: 1.2rem;
    }
}

Unexpected token }

Try running the entire script through jslint. This may help point you at the cause of the error.

Edit Ok, it's not quite the syntax of the script that's the problem. At least not in a way that jslint can detect.

Having played with your live code at http://ft2.hostei.com/ft.v1/, it looks like there are syntax errors in the generated code that your script puts into an onclick attribute in the DOM. Most browsers don't do a very good job of reporting errors in JavaScript run via such things (what is the file and line number of a piece of script in the onclick attribute of a dynamically inserted element?). This is probably why you get a confusing error message in Chrome. The FireFox error message is different, and also doesn't have a useful line number, although FireBug does show the code which causes the problem.

This snippet of code is taken from your edit function which is in the inline script block of your HTML:

var sub = document.getElementById('submit');
...
sub.setAttribute("onclick", "save(\""+file+"\", document.getElementById('name').value, document.getElementById('text').value");

Note that this sets the onclick attribute of an element to invalid JavaScript code:

<input type="submit" id="submit" onclick="save("data/wasup.htm", document.getElementById('name').value, document.getElementById('text').value">

The JS is:

save("data/wasup.htm", document.getElementById('name').value, document.getElementById('text').value

Note the missing close paren to finish the call to save.

As an aside, inserting onclick attributes is not a very modern or clean way of adding event handlers in JavaScript. Why are you not using the DOM's addEventListener to simply hook up a function to the element? If you were using something like jQuery, this would be simpler still.

How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?

As mentioned in some answers, there is the ability to create an exception class for each HTTP status that you want to return. I don't like the idea of having to create a class per status for each project. Here is what I came up with instead.

  • Create a generic exception that accepts an HTTP status
  • Create an Controller Advice exception handler

Let's get to the code

package com.javaninja.cam.exception;

import org.springframework.http.HttpStatus;


/**
 * The exception used to return a status and a message to the calling system.
 * @author norrisshelton
 */
@SuppressWarnings("ClassWithoutNoArgConstructor")
public class ResourceException extends RuntimeException {

    private HttpStatus httpStatus = HttpStatus.INTERNAL_SERVER_ERROR;

    /**
     * Gets the HTTP status code to be returned to the calling system.
     * @return http status code.  Defaults to HttpStatus.INTERNAL_SERVER_ERROR (500).
     * @see HttpStatus
     */
    public HttpStatus getHttpStatus() {
        return httpStatus;
    }

    /**
     * Constructs a new runtime exception with the specified HttpStatus code and detail message.
     * The cause is not initialized, and may subsequently be initialized by a call to {@link #initCause}.
     * @param httpStatus the http status.  The detail message is saved for later retrieval by the {@link
     *                   #getHttpStatus()} method.
     * @param message    the detail message. The detail message is saved for later retrieval by the {@link
     *                   #getMessage()} method.
     * @see HttpStatus
     */
    public ResourceException(HttpStatus httpStatus, String message) {
        super(message);
        this.httpStatus = httpStatus;
    }
}

Then I create a controller advice class

package com.javaninja.cam.spring;


import com.javaninja.cam.exception.ResourceException;

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;


/**
 * Exception handler advice class for all SpringMVC controllers.
 * @author norrisshelton
 * @see org.springframework.web.bind.annotation.ControllerAdvice
 */
@org.springframework.web.bind.annotation.ControllerAdvice
public class ControllerAdvice {

    /**
     * Handles ResourceExceptions for the SpringMVC controllers.
     * @param e SpringMVC controller exception.
     * @return http response entity
     * @see ExceptionHandler
     */
    @ExceptionHandler(ResourceException.class)
    public ResponseEntity handleException(ResourceException e) {
        return ResponseEntity.status(e.getHttpStatus()).body(e.getMessage());
    }
}

To use it

throw new ResourceException(HttpStatus.BAD_REQUEST, "My message");

http://javaninja.net/2016/06/throwing-exceptions-messages-spring-mvc-controller/

multiple axis in matplotlib with different scales

Since Steve Tjoa's answer always pops up first and mostly lonely when I search for multiple y-axes at Google, I decided to add a slightly modified version of his answer. This is the approach from this matplotlib example.

Reasons:

  • His modules sometimes fail for me in unknown circumstances and cryptic intern errors.
  • I don't like to load exotic modules I don't know (mpl_toolkits.axisartist, mpl_toolkits.axes_grid1).
  • The code below contains more explicit commands of problems people often stumble over (like single legend for multiple axes, using viridis, ...) rather than implicit behavior.

Plot

import matplotlib.pyplot as plt 

# Create figure and subplot manually
# fig = plt.figure()
# host = fig.add_subplot(111)

# More versatile wrapper
fig, host = plt.subplots(figsize=(8,5)) # (width, height) in inches
# (see https://matplotlib.org/3.3.3/api/_as_gen/matplotlib.pyplot.subplots.html)
    
par1 = host.twinx()
par2 = host.twinx()
    
host.set_xlim(0, 2)
host.set_ylim(0, 2)
par1.set_ylim(0, 4)
par2.set_ylim(1, 65)
    
host.set_xlabel("Distance")
host.set_ylabel("Density")
par1.set_ylabel("Temperature")
par2.set_ylabel("Velocity")

color1 = plt.cm.viridis(0)
color2 = plt.cm.viridis(0.5)
color3 = plt.cm.viridis(.9)

p1, = host.plot([0, 1, 2], [0, 1, 2],    color=color1, label="Density")
p2, = par1.plot([0, 1, 2], [0, 3, 2],    color=color2, label="Temperature")
p3, = par2.plot([0, 1, 2], [50, 30, 15], color=color3, label="Velocity")

lns = [p1, p2, p3]
host.legend(handles=lns, loc='best')

# right, left, top, bottom
par2.spines['right'].set_position(('outward', 60))

# no x-ticks                 
par2.xaxis.set_ticks([])

# Sometimes handy, same for xaxis
#par2.yaxis.set_ticks_position('right')

# Move "Velocity"-axis to the left
# par2.spines['left'].set_position(('outward', 60))
# par2.spines['left'].set_visible(True)
# par2.yaxis.set_label_position('left')
# par2.yaxis.set_ticks_position('left')

host.yaxis.label.set_color(p1.get_color())
par1.yaxis.label.set_color(p2.get_color())
par2.yaxis.label.set_color(p3.get_color())

# Adjust spacings w.r.t. figsize
fig.tight_layout()
# Alternatively: bbox_inches='tight' within the plt.savefig function 
#                (overwrites figsize)

# Best for professional typesetting, e.g. LaTeX
plt.savefig("pyplot_multiple_y-axis.pdf")
# For raster graphics use the dpi argument. E.g. '[...].png", dpi=200)'

NoClassDefFoundError: org/slf4j/impl/StaticLoggerBinder

You have included the dependency for sflj's api, but not the dependency for the implementation of the api, that is a separate jar, you could try slf4j-simple-1.6.1.jar.

Upgrade python in a virtualenv

For everyone with the problem

Error: Command '['/Users/me/Sites/site/venv3/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1.

You have to install python3.6-venv

 sudo apt-get install python3.6-venv

What is the MySQL VARCHAR max size?

As per the online docs, there is a 64K row limit and you can work out the row size by using:

row length = 1
             + (sum of column lengths)
             + (number of NULL columns + delete_flag + 7)/8
             + (number of variable-length columns)

You need to keep in mind that the column lengths aren't a one-to-one mapping of their size. For example, CHAR(10) CHARACTER SET utf8 requires three bytes for each of the ten characters since that particular encoding has to account for the three-bytes-per-character property of utf8 (that's MySQL's utf8 encoding rather than "real" UTF-8, which can have up to four bytes).

But, if your row size is approaching 64K, you may want to examine the schema of your database. It's a rare table that needs to be that wide in a properly set up (3NF) database - it's possible, just not very common.

If you want to use more than that, you can use the BLOB or TEXT types. These do not count against the 64K limit of the row (other than a small administrative footprint) but you need to be aware of other problems that come from their use, such as not being able to sort using the entire text block beyond a certain number of characters (though this can be configured upwards), forcing temporary tables to be on disk rather than in memory, or having to configure client and server comms buffers to handle the sizes efficiently.

The sizes allowed are:

TINYTEXT          255 (+1 byte  overhead)
TEXT          64K - 1 (+2 bytes overhead)
MEDIUMTEXT    16M - 1 (+3 bytes overhead)
LONGTEXT      4G  - 1 (+4 bytes overhead)

You still have the byte/character mismatch (so that a MEDIUMTEXT utf8 column can store "only" about half a million characters, (16M-1)/3 = 5,592,405) but it still greatly expands your range.

python: SyntaxError: EOL while scanning string literal

In my case, I forgot (' or ") at the end of string. E.g 'ABC' or "ABC"

INSTALL_FAILED_DUPLICATE_PERMISSION... C2D_MESSAGE

replace below lines:

<permission android:name="com.myapp.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="com.myapp.permission.C2D_MESSAGE" 
android:protectionLevel="signature" />

C# How can I check if a URL exists/is valid?

Web servers respond with a HTTP status code indicating the outcome of the request e.g. 200 (sometimes 202) means success, 404 - not found etc (see here). Assuming the server address part of the URL is correct and you are not getting a socket timeout, the exception is most likely telling you the HTTP status code was other than 200. I would suggest checking the class of the exception and seeing if the exception carries the HTTP status code.

IIRC - The call in question throws a WebException or a descendant. Check the class name to see which one and wrap the call in a try block to trap the condition.

Get lengths of a list in a jinja2 template

Alex' comment looks good but I was still confused with using range. The following worked for me while working on a for condition using length within range.

{% for i in range(0,(nums['list_users_response']['list_users_result']['users'])| length) %}
<li>    {{ nums['list_users_response']['list_users_result']['users'][i]['user_name'] }} </li>
{% endfor %}

MySQL - Make an existing Field Unique

Just write this query in your db phpmyadmin.

ALTER TABLE TableName ADD UNIQUE (FieldName)

Eg: ALTER TABLE user ADD UNIQUE (email)

Object passed as parameter to another class, by value or reference?

Objects will be passed by reference irrespective of within methods of same class or another class. Here is a modified version of same sample code to help you understand. The value will be changed to 'xyz.'

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    public class Employee
    {
        public string Name { get; set; }
    }

    public class MyClass
    {
        public Employee EmpObj;

        public void SetObject(Employee obj)
        {
            EmpObj = obj;
        }
    }

    public class Program
    {
       static void Main(string[] args)
        {
            Employee someTestObj = new Employee();
            someTestObj.Name = "ABC";

            MyClass cls = new MyClass();
            cls.SetObject(someTestObj);

            Console.WriteLine("Changing Emp Name To xyz");
            someTestObj.Name = "xyz";

            Console.WriteLine("Accessing Assigned Emp Name");
            Console.WriteLine(cls.EmpObj.Name); 

           Console.ReadLine();
       }       
    }
 }

GET URL parameter in PHP

Use this:

$parameter = $_SERVER['QUERY_STRING'];
echo $parameter;

Or just use:

$parameter = $_GET['link'];
echo $parameter ;

Convert Mercurial project to Git

Another option is to create a free Kiln account -- kiln round trips between git and hg with 100% metadata retention, so you can use it for a one time convert or use it to access a repository using whichever client you prefer.

How to get browser width using JavaScript code?

An adapted solution to modern JS of Travis' answer:

const getPageWidth = () => {
  const bodyMax = document.body
    ? Math.max(document.body.scrollWidth, document.body.offsetWidth)
    : 0;

  const docElementMax = document.documentElement
    ? Math.max(
        document.documentElement.scrollWidth,
        document.documentElement.offsetWidth,
        document.documentElement.clientWidth
      )
    : 0;

  return Math.max(bodyMax, docElementMax);
};

How do I debug Windows services in Visual Studio?

You can also try this.

  1. Create your Windows service and install and start…. That is, Windows services must be running in your system.
  2. While your service is running, go to the Debug menu, click on Attach Process (or process in old Visual Studio)
  3. Find your running service, and then make sure the Show process from all users and Show processes in all sessions is selected, if not then select it.

enter image description here

  1. Click the Attach button
  2. Click OK
  3. Click Close
  4. Set a break point to your desirable location and wait for execute. It will debug automatic whenever your code reaches to that point.
  5. Remember, put your breakpoint at reachable place, if it is onStart(), then stop and start the service again

(After a lot of googling, I found this in "How to debug the Windows Services in Visual Studio".)

Rails raw SQL example

You can execute raw query using ActiveRecord. And I will suggest to go with SQL block 

query = <<-SQL 
  SELECT * 
  FROM payment_details
  INNER JOIN projects 
          ON projects.id = payment_details.project_id
  ORDER BY payment_details.created_at DESC
SQL

result = ActiveRecord::Base.connection.execute(query)

How to parse JSON without JSON.NET library?

Have you tried using JavaScriptSerializer ? There's also DataContractJsonSerializer

How to split an integer into an array of digits?

Maybe join+split:

>>> a=12345
>>> list(map(int,' '.join(str(a)).split()))
[1, 2, 3, 4, 5]
>>> [int(i) for i in ' '.join(str(a)).split()]
[1, 2, 3, 4, 5]
>>>

str.join + str.split is your friend, also we use map or list comprehension to get a list, (split what we join :-)).

Is there a way to make mv create the directory to be moved to if it doesn't exist?

The simpliest way to do that is:

mkdir [directory name] && mv [filename] $_

Let's suppose I downloaded pdf files located in my download directory (~/download) and I want to move all of them into a directory that doesn't exist (let's say my_PDF).

I'll type the following command (making sure my current working directory is ~/download):

mkdir my_PDF && mv *.pdf $_

You can add -p option to mkdir if you want to create subdirectories just like this: (supposed I want to create a subdirectory named python):

mkdir -p my_PDF/python && mv *.pdf $_

How to decode JWT Token?

 
  var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_config["Jwt:Key"]));
  var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
  var claims = new[]
  {
      new Claim(JwtRegisteredClaimNames.Email, model.UserName),
      new Claim(JwtRegisteredClaimNames.NameId, model.Id.ToString()),
  };
  var token = new JwtSecurityToken(_config["Jwt:Issuer"],
      _config["Jwt:Issuer"],
      claims,
      expires: DateTime.Now.AddMinutes(30),
      signingCredentials: creds);

Then extract content

 var handler = new JwtSecurityTokenHandler();
 string authHeader = Request.Headers["Authorization"];
 authHeader = authHeader.Replace("Bearer ", "");
 var jsonToken = handler.ReadToken(authHeader);
 var tokenS = handler.ReadToken(authHeader) as JwtSecurityToken;
 var id = tokenS.Claims.First(claim => claim.Type == "nameid").Value;

Python: convert string to byte array

for python 3 it worked for what @HYRY posted. I needed it for a returned data in a dbus.array. This is the only way it worked

s = "ABCD"

from array import array

a = array("B", s)

Check if a value exists in ArrayList

We can use contains method to check if an item exists if we have provided the implementation of equals and hashCode else object reference will be used for equality comparison. Also in case of a list contains is O(n) operation where as it is O(1) for HashSet so better to use later. In Java 8 we can use streams also to check item based on its equality or based on a specific property.

Java 8

CurrentAccount conta5 = new CurrentAccount("João Lopes", 3135);
boolean itemExists = lista.stream().anyMatch(c -> c.equals(conta5)); //provided equals and hashcode overridden
System.out.println(itemExists); // true

String nameToMatch = "Ricardo Vitor";
boolean itemExistsBasedOnProp = lista.stream().map(CurrentAccount::getName).anyMatch(nameToMatch::equals);
System.out.println(itemExistsBasedOnProp); //true

How to validate a credit card number

A credit card number is not a bunch of random numbers. There is a formula for checking if it is correct.

After a quick Google search I found this JavaScript which will check a credit card number to be valid.

http://javascript.internet.com/forms/credit-card-number-validation.html

URL Broken: Internet archive: http://web.archive.org/web/20100129174150/http://javascript.internet.com/forms/credit-card-number-validation.html?

<!-- TWO STEPS TO INSTALL CREDIT CARD NUMBER VALIDATION:

  1.  Copy the code into the HEAD of your HTML document
  2.  Add the last code into the BODY of your HTML document  -->

<!-- STEP ONE: Paste this code into the HEAD of your HTML document  -->

<HEAD>

  <script type="text/javascript">
    <!--
    /* This script and many more are available free online at
    The JavaScript Source!! http://javascript.internet.com
    Created by: David Leppek :: https://www.azcode.com/Mod10

    Basically, the algorithm takes each digit, from right to left and muliplies each second
    digit by two. If the multiple is two-digits long (i.e.: 6 * 2 = 12) the two digits of
    the multiple are then added together for a new number (1 + 2 = 3). You then add up the
    string of numbers, both unaltered and new values and get a total sum. This sum is then
    divided by 10 and the remainder should be zero if it is a valid credit card. Hense the
    name Mod 10 or Modulus 10.
    */
    function Mod10(ccNumb) {  // v2.0
      var valid = "0123456789"  // Valid digits in a credit card number
      var len = ccNumb.length;  // The length of the submitted cc number
      var iCCN = parseInt(ccNumb);  // Integer of ccNumb
      var sCCN = ccNumb.toString();  // String of ccNumb
      sCCN = sCCN.replace (/^\s+|\s+$/g,'');  // Strip spaces
      var iTotal = 0;  // Integer total set at zero
      var bNum = true;  // By default assume it is a number
      var bResult = false;  // By default assume it is NOT a valid cc
      var temp;  // Temporary variable for parsing string
      var calc;  // Used for calculation of each digit

      // Determine if the ccNumb is in fact all numbers
      for (var j=0; j<len; j++) {
        temp = "" + sCCN.substring(j, j+1);
        if (valid.indexOf(temp) == "-1"){
          bNum = false;
        }
      }

      // If it is NOT a number, you can either alert to the fact, or just pass a failure
      if (!bNum) {
        /* alert("Not a Number"); */
        bResult = false;
      }

      // Determine if it is the proper length
      if ((len == 0) && (bResult)) {  // Nothing, the field is blank AND passed above # check
        bResult = false;
      }
      else { // ccNumb is a number and the proper length - let's
             //  see if it is a valid card number

        if (len >= 15) {  // 15 or 16 for Amex or V/MC
          for (var i=len;i>0;i--) {  // LOOP through the digits of the card
            calc = parseInt(iCCN) % 10;  // Right most digit
            calc = parseInt(calc);  // Assure it is an integer
            iTotal += calc;  // Running total of the card number as we loop - Do Nothing to first digit
            i--;  // Decrement the count - move to the next digit in the card
            iCCN = iCCN / 10;                               // Subtracts right most digit from ccNumb
            calc = parseInt(iCCN) % 10;     // NEXT right most digit
            calc = calc *2;                                 // multiply the digit by two

            // Instead of some screwy method of converting 16 to a string
            // and then parsing 1 and 6 and then adding them to make 7,
            // I use a simple switch statement to change the value
            // of calc2 to 7 if 16 is the multiple.
            switch(calc) {
              case 10: calc = 1; break;  // 5*2=10 & 1+0 = 1
              case 12: calc = 3; break;  // 6*2=12 & 1+2 = 3
              case 14: calc = 5; break;  // 7*2=14 & 1+4 = 5
              case 16: calc = 7; break;  // 8*2=16 & 1+6 = 7
              case 18: calc = 9; break;  // 9*2=18 & 1+8 = 9
              default: calc = calc;      // 4*2= 8 &   8 = 8  - the same for all lower numbers
            }
            iCCN = iCCN / 10;  // Subtracts right most digit from ccNum
            iTotal += calc;  // Running total of the card number as we loop
          } // END OF LOOP

          if ((iTotal%10)==0){  // Check to see if the sum Mod 10 is zero
            bResult = true;  // This IS (or could be) a valid credit card number.
          }
          else {
            bResult = false;  // This could NOT be a valid credit card number
          }
        }
      }

      // Change alert to on-page display or other indication as needed.
      if (bResult) {
        alert("This IS a valid Credit Card Number!");
      }
      if (!bResult) {
        alert("This is NOT a valid Credit Card Number!");
      }
      return bResult; // Return the results
    }
    // -->
  </script>

</HEAD>


<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<div align="center">
  <form name="Form1">
    <table width="50%" border="0" cellspacing="0" cellpadding="5">
      <tr>
        <td width="50%" align="right">Credit Card Number:   </td>
        <td width="50%">
          <input name="CreditCard" type="text" value="4012888888881881" size="18" maxlength="16" style="border: 1px solid #000098; padding: 3px;">
        </td>
      </tr>
      <tr>
        <td colspan="2" align="center">
          <input type="button" name="Button" style="color: #fff; background: #000098; font-weight:bold; border: solid 1px #000;" value="TEST CARD NUMBER" onClick="return Mod10(document.Form1.CreditCard.value);">
        </td>
      </tr>
    </table>
  </form>
</div>

<p><center>
  <font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
  by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

<!-- Script Size:  4.97 KB -->

WindowsError: [Error 126] The specified module could not be found

NestedCaveats solution worked for me.

Imported my .dll files before importing torch and gpytorch, and all went smoothly.

So I just want to add that its not just importing pytorch but I can confirm that torch and gpytorch have this issue as well. I'd assume it covers any other torch-related libraries.

The opposite of Intersect()

 
string left = "411329_SOFT_MAC_GREEN";
string right= "SOFT_MAC_GREEN";

string[] l = left.Split('_');
string[] r = right.Split('_');

string[] distinctLeft = l.Distinct().ToArray();
string[] distinctRight = r.Distinct().ToArray();

var commonWord = l.Except(r, StringComparer.OrdinalIgnoreCase)
string result = String.Join("_",commonWord);
result = "411329"

Android textview outline text

Here's the trick I found that works better than MagicTextView's stroke IMO

@Override
protected void onDraw(Canvas pCanvas) {
    int textColor = getTextColors().getDefaultColor();
    setTextColor(mOutlineColor); // your stroke's color
    getPaint().setStrokeWidth(10);
    getPaint().setStyle(Paint.Style.STROKE);
    super.onDraw(pCanvas);
    setTextColor(textColor);
    getPaint().setStrokeWidth(0);
    getPaint().setStyle(Paint.Style.FILL);
    super.onDraw(pCanvas);
}

Setting the Textbox read only property to true using JavaScript

document.getElementById('textbox-id').readOnly=true should work

Maven Out of Memory Build Failure

I got same problem trying to compile "clean install" using a Lowend 512Mb ram VPS and good CPU. Run OutOfMemory and killed script repeatly.

I used export MAVEN_OPTS="-Xmx512m -XX:MaxPermSize=350m" and worked.

Still getting some other compiling failure because is the first time i need Maven, but OutOfMemory problem has gone.

Always pass weak reference of self into block in ARC?

As Leo points out, the code you added to your question would not suggest a strong reference cycle (a.k.a., retain cycle). One operation-related issue that could cause a strong reference cycle would be if the operation is not getting released. While your code snippet suggests that you have not defined your operation to be concurrent, but if you have, it wouldn't be released if you never posted isFinished, or if you had circular dependencies, or something like that. And if the operation isn't released, the view controller wouldn't be released either. I would suggest adding a breakpoint or NSLog in your operation's dealloc method and confirm that's getting called.

You said:

I understand the notion of retain cycles, but I am not quite sure what happens in blocks, so that confuses me a little bit

The retain cycle (strong reference cycle) issues that occur with blocks are just like the retain cycle issues you're familiar with. A block will maintain strong references to any objects that appear within the block, and it will not release those strong references until the block itself is released. Thus, if block references self, or even just references an instance variable of self, that will maintain strong reference to self, that is not resolved until the block is released (or in this case, until the NSOperation subclass is released.

For more information, see the Avoid Strong Reference Cycles when Capturing self section of the Programming with Objective-C: Working with Blocks document.

If your view controller is still not getting released, you simply have to identify where the unresolved strong reference resides (assuming you confirmed the NSOperation is getting deallocated). A common example is the use of a repeating NSTimer. Or some custom delegate or other object that is erroneously maintaining a strong reference. You can often use Instruments to track down where objects are getting their strong references, e.g.:

record reference counts in Xcode 6

Or in Xcode 5:

record reference counts in Xcode 5

PHPMailer - SMTP ERROR: Password command failed when send mail from my server

You need to use an APP password.

Visit this link to view how to create one.

How do I add the Java API documentation to Eclipse?

For offline Javadoc from zip file rather than extracting it.

Why this approach?

This is already answered which uses extracted zip data but it consumes more memory than simple zip file.

Comparison of zip file and extracted data.

jdk-6u25-fcs-bin-b04-apidocs.zip  --->  ~57 MB
after extracting this zip file  --->  ~264 MB !

So this approach saves my approx. 200 MB.

How to use apidocs.zip?

1.Open Windows -> Preferences

enter image description here

2.Select jre from Installed JREs then Click Edit...

enter image description here

3.Select all .jar files from JRE system libraries then Click Javadoc Location...

enter image description here

4.Browse for apidocs.zip file for Archive path and set Path within archive as shown above. That's it.

5.Put cursor on any class name or method name and hit Shift + F2

How to output numbers with leading zeros in JavaScript?

From https://gist.github.com/1180489

function pad(a, b){
  return(1e15 + a + '').slice(-b);
}

With comments:

function pad(
  a, // the number to convert 
  b // number of resulting characters
){
  return (
    1e15 + a + // combine with large number
    "" // convert to string
  ).slice(-b) // cut leading "1"
}

X-Frame-Options on apache

This worked for me on all browsers:

  1. Created one page with all my javascript
  2. Created a 2nd page on the same server and embedded the first page using the object tag.
  3. On my third party site I used the Object tag to embed the 2nd page.
  4. Created a .htaccess file on the original server in the public_html folder and put Header unset X-Frame-Options in it.

Python Checking a string's first and last character

When you set a string variable, it doesn't save quotes of it, they are a part of its definition. so you don't need to use :1

What's the best way to determine the location of the current PowerShell script?

I found that the older solutions posted here didn't work for me on PowerShell V5. I came up with this:

try {
    $scriptPath = $PSScriptRoot
    if (!$scriptPath)
    {
        if ($psISE)
        {
            $scriptPath = Split-Path -Parent -Path $psISE.CurrentFile.FullPath
        }
        else {
            Write-Host -ForegroundColor Red "Cannot resolve script file's path"
            exit 1
        }
    }
}
catch {
    Write-Host -ForegroundColor Red "Caught Exception: $($Error[0].Exception.Message)"
    exit 2
}

Write-Host "Path: $scriptPath"

Hosting ASP.NET in IIS7 gives Access is denied?

After some thinking and a lot of of trial and error I found out that this error occurred because part of my web.config was encrypted and for some reason the key was no longer valid.

Re-encrypting the config section solved the issue.

typedef fixed length array

You want

typedef char type24[3];

C type declarations are strange that way. You put the type exactly where the variable name would go if you were declaring a variable of that type.

How to enable NSZombie in Xcode?

In Xcode 4.5.2 goto Product -> Edit Scheme -> and Under the Diagnostics tab check the check box in between Objective C and Enable Zombie Objects and Click on OK

Laravel 5 – Clear Cache in Shared Hosting Server

As I can see: http://itsolutionstuff.com/post/laravel-5-clear-cache-from-route-view-config-and-all-cache-data-from-applicationexample.html

is it possible to use the code below with the new clear cache commands:

//Clear Cache facade value:
Route::get('/clear-cache', function() {
    $exitCode = Artisan::call('cache:clear');
    return '<h1>Cache facade value cleared</h1>';
});

//Reoptimized class loader:
Route::get('/optimize', function() {
    $exitCode = Artisan::call('optimize');
    return '<h1>Reoptimized class loader</h1>';
});

//Route cache:
Route::get('/route-cache', function() {
    $exitCode = Artisan::call('route:cache');
    return '<h1>Routes cached</h1>';
});

//Clear Route cache:
Route::get('/route-clear', function() {
    $exitCode = Artisan::call('route:clear');
    return '<h1>Route cache cleared</h1>';
});

//Clear View cache:
Route::get('/view-clear', function() {
    $exitCode = Artisan::call('view:clear');
    return '<h1>View cache cleared</h1>';
});

//Clear Config cache:
Route::get('/config-cache', function() {
    $exitCode = Artisan::call('config:cache');
    return '<h1>Clear Config cleared</h1>';
});

It's not necessary to give the possibility to clear the caches to everyone, especially in a production enviroment, so I suggest to comment that routes and, when it's needed, to de-comment the code and run the routes.

How do I read the source code of shell commands?

Direct links to source for some popular programs in coreutils:

Full list here.

Testing the type of a DOM element in JavaScript

roenving is correct BUT you need to change the test to:

if(element.nodeType == 1) {
//code
}

because nodeType of 3 is actually a text node and nodeType of 1 is an HTML element. See http://www.w3schools.com/Dom/dom_nodetype.asp

Favicon not showing up in Google Chrome

Upload your favicon.ico to the root directory of your website and that should work with Chrome. Some browsers disregard the meta tag and just use /favicon.ico

Go figure?.....

Finding even or odd ID values

In oracle,

select num from table where MOD (num, 2) = 0;

What is the difference between SessionState and ViewState?

Session State contains information that is pertaining to a specific session (by a particular client/browser/machine) with the server. It's a way to track what the user is doing on the site.. across multiple pages...amid the statelessness of the Web. e.g. the contents of a particular user's shopping cart is session data. Cookies can be used for session state.
View State on the other hand is information specific to particular web page. It is stored in a hidden field so that it isn't visible to the user. It is used to maintain the user's illusion that the page remembers what he did on it the last time - dont give him a clean page every time he posts back. Check this page for more.

Save Screen (program) output to a file

Existing screen log can be saved by :

Ctrl+A : hardcopy -h filename

Eclipse: Error ".. overlaps the location of another project.." when trying to create new project

This too took me sometime to figure out.

Solution:

To create a new Maven Project under the existing workspace, just have the "Use default Workspace location" ticked (Ignore what is in the grayed out location text input).

The name of the project will be determined by you Artifact Id in step 2 of the creation wizard.

Reasoning:

It was so confusing because in my case, because when I selected to create a new Maven Project: the default workspace loaction is ticked and directly proceeding it is the grayed out "Location" text input had the workspace location + the existing project I was looking at before choose to create a new Maven Project. (ie: Location = '[workspace path]/last looked at project')

So I unticked the default workspace location box and entered in '[workspace path]/new project', which didn't work because eclipse expects the [workspace path] to be different compared to the default path. (Otherwise we would of selected the default workspace check box).

How can I get the named parameters from a URL using Flask?

The URL parameters are available in request.args, which is an ImmutableMultiDict that has a get method, with optional parameters for default value (default) and type (type) - which is a callable that converts the input value to the desired format. (See the documentation of the method for more details.)

from flask import request

@app.route('/my-route')
def my_route():
  page = request.args.get('page', default = 1, type = int)
  filter = request.args.get('filter', default = '*', type = str)

Examples with the code above:

/my-route?page=34               -> page: 34  filter: '*'
/my-route                       -> page:  1  filter: '*'
/my-route?page=10&filter=test   -> page: 10  filter: 'test'
/my-route?page=10&filter=10     -> page: 10  filter: '10'
/my-route?page=*&filter=*       -> page:  1  filter: '*'

How do you import classes in JSP?

FYI - if you are importing a List into a JSP, chances are pretty good that you are violating MVC principles. Take a few hours now to read up on the MVC approach to web app development (including use of taglibs) - do some more googling on the subject, it's fascinating and will definitely help you write better apps.

If you are doing anything more complicated than a single JSP displaying some database results, please consider using a framework like Spring, Grails, etc... It will absolutely take you a bit more effort to get going, but it will save you so much time and effort down the road that I really recommend it. Besides, it's cool stuff :-)

Java: Sending Multiple Parameters to Method

Suppose you have void method that prints many objects;

public static void print( Object... values){
   for(Object c : values){
      System.out.println(c);
   }
}

Above example I used vararge as an argument that accepts values from 0 to N.

From comments: What if 2 strings and 5 integers ??

Answer: 

print("string1","string2",1,2,3,4,5);

Count number of iterations in a foreach loop

You can do sizeof($Contents) or count($Contents)

also this 

$count = 0;
foreach($Contents as $items) {
  $count++;
  $items[number];
}

How do I move a file from one location to another in Java?

Try this :-

  boolean success = file.renameTo(new File(Destdir, file.getName()));

Unable to Connect to GitHub.com For Cloning

You can try to clone using the HTTPS protocol. Terminal command:

git clone https://github.com/RestKit/RestKit.git

How to generate Javadoc HTML files in Eclipse?

To quickly add a Javadoc use following shortcut:

Windows: alt + shift + J

Mac: ? + Alt + J

Depending on selected context, a Javadoc will be printed. To create Javadoc written by OP, select corresponding method and hit the shotcut keys.

What Content-Type value should I send for my XML sitemap?

text/xml is for documents that would be meaningful to a human if presented as text without further processing, application/xml is for everything else

Every XML entity is suitable for use with the application/xml media type without modification. But this does not exploit the fact that XML can be treated as plain text in many cases. MIME user agents (and web user agents) that do not have explicit support for application/xml will treat it as application/octet-stream, for example, by offering to save it to a file.

To indicate that an XML entity should be treated as plain text by default, use the text/xml media type. This restricts the encoding used in the XML entity to those that are compatible with the requirements for text media types as described in [RFC-2045] and [RFC-2046], e.g., UTF-8, but not UTF-16 (except for HTTP).

— http://www.ietf.org/rfc/rfc2376.txt

Converting NSData to NSString in Objective c

The docs for NSString says

https://developer.apple.com/documentation/foundation/nsstring/1416374-initwithdata

Return Value An NSString object initialized by converting the bytes in data into Unicode characters using encoding. The returned object may be different from the original receiver. Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding).

You should try other encoding to check if it solves your problem

 // The following constants are provided by NSString as possible string encodings.
enum {
   NSASCIIStringEncoding = 1,
   NSNEXTSTEPStringEncoding = 2,
   NSJapaneseEUCStringEncoding = 3,
   NSUTF8StringEncoding = 4,
   NSISOLatin1StringEncoding = 5,
   NSSymbolStringEncoding = 6,
   NSNonLossyASCIIStringEncoding = 7,
   NSShiftJISStringEncoding = 8,
   NSISOLatin2StringEncoding = 9,
   NSUnicodeStringEncoding = 10,
   NSWindowsCP1251StringEncoding = 11,
   NSWindowsCP1252StringEncoding = 12,
   NSWindowsCP1253StringEncoding = 13,
   NSWindowsCP1254StringEncoding = 14,
   NSWindowsCP1250StringEncoding = 15,
   NSISO2022JPStringEncoding = 21,
   NSMacOSRomanStringEncoding = 30,
   NSUTF16StringEncoding = NSUnicodeStringEncoding,
   NSUTF16BigEndianStringEncoding = 0x90000100,
   NSUTF16LittleEndianStringEncoding = 0x94000100,
   NSUTF32StringEncoding = 0x8c000100,
   NSUTF32BigEndianStringEncoding = 0x98000100,
   NSUTF32LittleEndianStringEncoding = 0x9c000100,
   NSProprietaryStringEncoding = 65536
};

How to add a ScrollBar to a Stackpanel

For horizontally oriented StackPanel, explicitly putting both the scrollbar visibilities worked for me to get the horizontal scrollbar.

    <ScrollViewer VerticalScrollBarVisibility="Hidden" HorizontalScrollBarVisibility="Auto" >
        <StackPanel Orientation="Horizontal" />
    </ScrollViewer>

Why is HttpClient BaseAddress not working?

Ran into a issue with the HTTPClient, even with the suggestions still could not get it to authenticate. Turns out I needed a trailing '/' in my relative path.

i.e.

var result = await _client.GetStringAsync(_awxUrl + "api/v2/inventories/?name=" + inventoryName);

var result = await _client.PostAsJsonAsync(_awxUrl + "api/v2/job_templates/" + templateId+"/launch/" , new {
                inventory = inventoryId
            });

python pip: force install ignoring dependencies

pip has a --no-dependencies switch. You should use that.

For more information, run pip install -h, where you'll see this line: 

--no-deps, --no-dependencies
                        Ignore package dependencies

Function is not defined - uncaught referenceerror

Please check whether you have provided js references correctly. JQuery files first and then your custom files. Since you are using '$' in your js methods.

How to check the version of scipy

From the python command prompt:

import scipy
print scipy.__version__

In python 3 you'll need to change it to:

print (scipy.__version__)

How to ORDER BY a SUM() in MySQL?

Don'y forget that if you are mixing grouped (ie. SUM) fields and non-grouped fields, you need to GROUP BY one of the non-grouped fields.

Try this:

SELECT SUM(something) AS fieldname
FROM tablename
ORDER BY fieldname

OR this:

SELECT Field1, SUM(something) AS Field2
FROM tablename
GROUP BY Field1
ORDER BY Field2

And you can always do a derived query like this:

SELECT
   f1, f2
FROM
    (
        SELECT SUM(x+y) as f1, foo as F2
        FROM tablename 
        GROUP BY f2
    ) as table1
ORDER BY 
    f1

Many possibilities!

How to use regex in String.contains() method in Java

String.contains

String.contains works with String, period. It doesn't work with regex. It will check whether the exact String specified appear in the current String or not.

Note that String.contains does not check for word boundary; it simply checks for substring.

Regex solution

Regex is more powerful than String.contains, since you can enforce word boundary on the keywords (among other things). This means you can search for the keywords as words, rather than just substrings.

Use String.matches with the following regex:

"(?s).*\\bstores\\b.*\\bstore\\b.*\\bproduct\\b.*"

The RAW regex (remove the escaping done in string literal - this is what you get when you print out the string above):

(?s).*\bstores\b.*\bstore\b.*\bproduct\b.*

The \b checks for word boundary, so that you don't get a match for restores store products. Note that stores 3store_product is also rejected, since digit and _ are considered part of a word, but I doubt this case appear in natural text.

Since word boundary is checked for both sides, the regex above will search for exact words. In other words, stores stores product will not match the regex above, since you are searching for the word store without s.

. normally match any character except a number of new line characters. (?s) at the beginning makes . matches any character without exception (thanks to Tim Pietzcker for pointing this out).

Is it possible for UIStackView to scroll?

I was looking to do the same thing and stumbled upon this excellent post. If you want to do this programmatically using the anchor API, this is the way to go.

To summarize, embed your UIStackView in your UIScrollView, and set the anchor constraints of the UIStackView to match those of the UIScrollView:

stackView.leadingAnchor.constraintEqualToAnchor(scrollView.leadingAnchor).active = true
stackView.trailingAnchor.constraintEqualToAnchor(scrollView.trailingAnchor).active = true
stackView.bottomAnchor.constraintEqualToAnchor(scrollView.bottomAnchor).active = true
stackView.topAnchor.constraintEqualToAnchor(scrollView.topAnchor).active = true
stackView.widthAnchor.constraintEqualToAnchor(scrollView.widthAnchor).active = true

ngModel cannot be used to register form controls with a parent formGroup directive

The answer is right on the error message, you need to indicate that it's standalone and therefore it doesn't conflict with the form controls:

[ngModelOptions]="{standalone: true}"

How to show/hide an element on checkbox checked/unchecked states using jQuery?

 
    <label  onclick="chkBulk();">
    <div class="icheckbox_flat-green" style="position: relative;">
      <asp:CheckBox ID="chkBulkAssign" runat="server" class="flat" 
       Style="position: 
         absolute; opacity: 0;" />
      </div>
      Bulk Assign
     </label>



    function chkBulk() {
    if ($('[id$=chkBulkAssign]')[0].checked) {
    $('div .icheckbox_flat-green').addClass('checked');
    $("[id$=btneNoteBulkExcelUpload]").show();           
    }
   else {
   $('div .icheckbox_flat-green').removeClass('checked');
   $("[id$=btneNoteBulkExcelUpload]").hide();
   }

jquery live hover

.live() has been deprecated as of jQuery 1.7

Use .on() instead and specify a descendant selector

http://api.jquery.com/on/

$("table").on({
  mouseenter: function(){
    $(this).addClass("inside");
  },
  mouseleave: function(){
    $(this).removeClass("inside");
  }
}, "tr");  // descendant selector

Uncaught TypeError: Cannot read property 'split' of undefined

 
og_date = "2012-10-01";
console.log(og_date); // => "2012-10-01"

console.log(og_date.split('-')); // => [ '2012', '10', '01' ]

og_date.value would only work if the date were stored as a property on the og_date object. Such as: var og_date = {}; og_date.value="2012-10-01"; In that case, your original console.log would work.

How to enable CORS in ASP.net Core WebAPI

Based on your comment in MindingData's answer, it has nothing to do with your CORS, it's working fine.

Your Controller action is returning the wrong data. HttpCode 415 means, "Unsupported Media type". This happens when you either pass the wrong format to the controller (i.e. XML to a controller which only accepts json) or when you return a wrong type (return Xml in a controller which is declared to only return xml).

For later one check existence of [Produces("...")]attribute on your action

How to watch for a route change in AngularJS?

 
$rootScope.$on( "$routeChangeStart", function(event, next, current) {
  //..do something
  //event.stopPropagation();  //if you don't want event to bubble up 
});

Create a list from two object lists with linq

This is Linq

var mergedList = list1.Union(list2).ToList();

This is Normaly (AddRange)

var mergedList=new List<Person>();
mergeList.AddRange(list1);
mergeList.AddRange(list2);

This is Normaly (Foreach)

var mergedList=new List<Person>();

foreach(var item in list1)
{
    mergedList.Add(item);
}
foreach(var item in list2)
{
     mergedList.Add(item);
}

This is Normaly (Foreach-Dublice)

var mergedList=new List<Person>();

foreach(var item in list1)
{
    mergedList.Add(item);
}
foreach(var item in list2)
{
   if(!mergedList.Contains(item))
   {
     mergedList.Add(item);
   }
}

angular-cli where is webpack.config.js file - new angular6 does not support ng eject

According to this issue, it was a design decision to not allow users to modify the Webpack configuration to reduce the learning curve.

Considering the number of useful configuration on Webpack, this is a great drawback.

I would not recommend using angular-cli for production applications, as it is highly opinionated.

error LNK2005, already defined?

Why this error?

You broke the one definition rule and hence the linking error.

Suggested Solutions:

If you need the same named variable in the two cpp files then You need to use Nameless namespace(Anonymous Namespace) to avoid the error. 

namespace 
{
    int k;
}

If you need to share the same variable across multiple files then you need to use extern.

A.h

extern int k;

A.cpp

#include "A.h"
int k = 0;

B.cpp

#include "A.h"

//Use `k` anywhere in the file

Loop backwards using indices in Python?

I wanted to loop through a two lists backwards at the same time so I needed the negative index. This is my solution:

a= [1,3,4,5,2]
for i in range(-1, -len(a), -1):
    print(i, a[i])

Result:

-1 2
-2 5
-3 4
-4 3
-5 1

Convert NSArray to NSString in Objective-C

I recently found a really good tutorial on Objective-C Strings:

http://ios-blog.co.uk/tutorials/objective-c-strings-a-guide-for-beginners/

And I thought that this might be of interest:

If you want to split the string into an array use a method called componentsSeparatedByString to achieve this:

NSString *yourString = @"This is a test string";
    NSArray *yourWords = [myString componentsSeparatedByString:@" "];

    // yourWords is now: [@"This", @"is", @"a", @"test", @"string"]

if you need to split on a set of several different characters, use NSString’s componentsSeparatedByCharactersInSet:

NSString *yourString = @"Foo-bar/iOS-Blog";
NSArray *yourWords = [myString componentsSeparatedByCharactersInSet:
                  [NSCharacterSet characterSetWithCharactersInString:@"-/"]
                ];

// yourWords is now: [@"Foo", @"bar", @"iOS", @"Blog"]

Note however that the separator string can’t be blank. If you need to separate a string into its individual characters, just loop through the length of the string and convert each char into a new string:

NSMutableArray *characters = [[NSMutableArray alloc] initWithCapacity:[myString length]];
for (int i=0; i < [myString length]; i++) {
    NSString *ichar  = [NSString stringWithFormat:@"%c", [myString characterAtIndex:i]];
    [characters addObject:ichar];
}

How to change background color of cell in table using java script

Try this:

function btnClick() {
    var x = document.getElementById("mytable").getElementsByTagName("td");
    x[0].innerHTML = "i want to change my cell color";
    x[0].style.backgroundColor = "yellow";            
}

Set from JS, backgroundColor is the equivalent of background-color in your style-sheet.

Note also that the .cells collection belongs to a table row, not to the table itself. To get all the cells from all rows you can instead use getElementsByTagName().

Demo: http://jsbin.com/ekituv/edit#preview

Map a 2D array onto a 1D array

You need to decide whether the array elements will be stored in row order or column order and then be consistent about it. http://en.wikipedia.org/wiki/Row-major_order

The C language uses row order for Multidimensional arrays

To simulate this with a single dimensional array, you multiply the row index by the width, and add the column index thus:

 int array[width * height];

 int SetElement(int row, int col, int value)
 {
    array[width * row + col] = value;  
 }

How to increase Java heap space for a tomcat app

For Windows Service, you need to run tomcat9w.exe (or 6w/7w/8w) depending on your version of tomcat. First, make sure tomcat is stopped. Then double click on tomcat9w.exe. Navigate to the Java tab. If you know you have 64 bit Windows with 64 bit Java and 64 bit Tomcat, then feel free to set the memory higher than 512. You'll need to do some task manager monitoring to determine how high to set it. For most apps developed in 2019... I'd recommend an initial memory pool of 1024, and the maximum memory pool of 2048. Of course if your computer has tons of RAM... feel free to go as high as you want. Also, see this answer: How to increase Maximum Memory Pool Size? Apache Tomcat 9

Forms authentication timeout vs sessionState timeout

They are different things. The Forms Authentication Timeout value sets the amount of time in minutes that the authentication cookie is set to be valid, meaning, that after value number of minutes, the cookie will expire and the user will no longer be authenticated—they will be redirected to the login page automatically. The slidingExpiration=true value is basically saying that as long as the user makes a request within the timeout value, they will continue to be authenticated (more details here). If you set slidingExpiration=false the authentication cookie will expire after value number of minutes regardless of whether the user makes a request within the timeout value or not.

The SessionState timeout value sets the amount of time a Session State provider is required to hold data in memory (or whatever backing store is being used, SQL Server, OutOfProc, etc) for a particular session. For example, if you put an object in Session using the value in your example, this data will be removed after 30 minutes. The user may still be authenticated but the data in the Session may no longer be present. The Session Timeout value is always reset after every request.

Insert/Update/Delete with function in SQL Server

You can't update tables from a function like you would a stored procedure, but you CAN update table variables.

So for example, you can't do this in your function:

create table MyTable
(
    ID int,
    column1 varchar(100)
)
update [MyTable]
set column1='My value'

but you can do:

declare @myTable table
(
    ID int,
    column1 varchar(100)
)

Update @myTable
set column1='My value'

Change application's starting activity

This is easy to fix.

  • Changes to the Launcher activity are also stored in the Debug configuration.
  • Go to Run > Debug Configurations and edit the setting.
  • There is also a similar setting in Intellij under Run > Edit Configurations select Run default Activity and it will no longer save the setting in this fashion.

How to auto-size an iFrame?

I found the solution by @ShripadK most helpful, but it does not work, if there is more than one iframe. My fix is:

function autoResizeIFrame() {
  $('iframe').height(
    function() {
      return $(this).contents().find('body').height() + 20;
    }
  )
}

$('iframe').contents().find('body').css(
  {"min-height": "100", "overflow" : "hidden"});

setTimeout(autoResizeIFrame, 2000);
setTimeout(autoResizeIFrame, 10000);
  • $('iframe').height($('iframe').contents().find('body').height() + 20) would set the height of every frame to the same value, namely the height of the content of the first frame. So I am using jquery's height() with a function instead of a value. That way the individual heights are calculated
  • + 20 is a hack to work around iframe scrollbar problems. The number must be bigger than the size of a scrollbar. The hack can probably be avoided but disabling the scrollbars for the iframe.
  • I use setTimeout instead of setInterval(..., 1) to reduce CPU load in my case

MySql server startup error 'The server quit without updating PID file '

Remove the pid file, then start up mysqld again.

json.dump throwing "TypeError: {...} is not JSON serializable" on seemingly valid object?

In my case, boolean values in my Python dict were the problem. JSON boolean values are in lowercase ("true", "false") whereas in Python they are in Uppercase ("True", "False"). Couldn't find this solution anywhere online but hope it helps.

How good is Java's UUID.randomUUID?

The original generation scheme for UUIDs was to concatenate the UUID version with the MAC address of the computer that is generating the UUID, and with the number of 100-nanosecond intervals since the adoption of the Gregorian calendar in the West. By representing a single point in space (the computer) and time (the number of intervals), the chance of a collision in values is effectively nil.

Selenium -- How to wait until page is completely loaded

It seems that you need to wait for the page to be reloaded before clicking on the "Add" button. In this case you could wait for the "Add Item" element to become stale before clicking on the reloaded element:

WebDriverWait wait = new WebDriverWait(driver, 20);
By addItem = By.xpath("//input[.='Add Item']");

// get the "Add Item" element
WebElement element = wait.until(ExpectedConditions.presenceOfElementLocated(addItem));

//trigger the reaload of the page
driver.findElement(By.id("...")).click();

// wait the element "Add Item" to become stale
wait.until(ExpectedConditions.stalenessOf(element));

// click on "Add Item" once the page is reloaded
wait.until(ExpectedConditions.presenceOfElementLocated(addItem)).click();

ImportError: No module named Image

On a system with both Python 2 and 3 installed and with pip2-installed Pillow failing to provide Image, it is possible to install PIL for Python 2 in a way that will solve ImportError: No module named Image:

easy_install-2.7 --user PIL

or

sudo easy_install-2.7 PIL

JetBrains / IntelliJ keyboard shortcut to collapse all methods

The above suggestion of Ctrl+Shift+- code folds all code blocks recursively. I only wanted to fold the methods for my classes.

Code > Folding > Expand all to level > 1

I managed to achieve this by using the menu option Code > Folding > Expand all to level > 1.

I re-assigned it to Ctrl+NumPad-1 which gives me a quick way to collapse my classes down to their methods.

This works at the 'block level' of the file and assumes that you have classes defined at the top level of your file, which works for code such as PHP but not for JavaScript (nested closures etc.)

ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)

You need to change the bind-address parameter to 127.0.0.1 in the mysql config file (my.ini or my.cnf) or use the one that is defined there.

If that doesn't work you should check that the mysql service is actually running.

WebView and HTML5 <video>

After long research, I got this thing working. See the following code:

Test.java

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;

public class Test extends Activity {

    HTML5WebView mWebView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mWebView = new HTML5WebView(this);

        if (savedInstanceState != null) {
            mWebView.restoreState(savedInstanceState);
        } else {    
            mWebView.loadUrl("http://192.168.1.18/xxxxxxxxxxxxxxxx/");
        }

        setContentView(mWebView.getLayout());
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mWebView.saveState(outState);
    }

    @Override
    public void onStop() {
        super.onStop();
        mWebView.stopLoading();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {

        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (mWebView.inCustomView()) {
                mWebView.hideCustomView();
            //  mWebView.goBack();
                //mWebView.goBack();
                return true;
            }

        }
        return super.onKeyDown(keyCode, event);
    }
}

HTML%VIDEO.java

package com.ivz.idemandtest;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.webkit.GeolocationPermissions;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;

public class HTML5WebView extends WebView {

    private Context                             mContext;
    private MyWebChromeClient                   mWebChromeClient;
    private View                                mCustomView;
    private FrameLayout                         mCustomViewContainer;
    private WebChromeClient.CustomViewCallback  mCustomViewCallback;

    private FrameLayout                         mContentView;
    private FrameLayout                         mBrowserFrameLayout;
    private FrameLayout                         mLayout;

    static final String LOGTAG = "HTML5WebView";

    private void init(Context context) {
        mContext = context;     
        Activity a = (Activity) mContext;

        mLayout = new FrameLayout(context);

        mBrowserFrameLayout = (FrameLayout) LayoutInflater.from(a).inflate(R.layout.custom_screen, null);
        mContentView = (FrameLayout) mBrowserFrameLayout.findViewById(R.id.main_content);
        mCustomViewContainer = (FrameLayout) mBrowserFrameLayout.findViewById(R.id.fullscreen_custom_content);

        mLayout.addView(mBrowserFrameLayout, COVER_SCREEN_PARAMS);

        // Configure the webview
        WebSettings s = getSettings();
        s.setBuiltInZoomControls(true);
        s.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
        s.setUseWideViewPort(true);
        s.setLoadWithOverviewMode(true);
      //  s.setSavePassword(true);
        s.setSaveFormData(true);
        s.setJavaScriptEnabled(true);
        mWebChromeClient = new MyWebChromeClient();
        setWebChromeClient(mWebChromeClient);

        setWebViewClient(new WebViewClient());

setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

        // enable navigator.geolocation 
       // s.setGeolocationEnabled(true);
       // s.setGeolocationDatabasePath("/data/data/org.itri.html5webview/databases/");

        // enable Web Storage: localStorage, sessionStorage
        s.setDomStorageEnabled(true);

        mContentView.addView(this);
    }

    public HTML5WebView(Context context) {
        super(context);
        init(context);
    }

    public HTML5WebView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }

    public HTML5WebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }

    public FrameLayout getLayout() {
        return mLayout;
    }

    public boolean inCustomView() {
        return (mCustomView != null);
    }

    public void hideCustomView() {
        mWebChromeClient.onHideCustomView();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if ((mCustomView == null) && canGoBack()){
                goBack();
                return true;
            }
        }
        return super.onKeyDown(keyCode, event);
    }

    private class MyWebChromeClient extends WebChromeClient {
        private Bitmap      mDefaultVideoPoster;
        private View        mVideoProgressView;

        @Override
        public void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback)
        {
            //Log.i(LOGTAG, "here in on ShowCustomView");
            HTML5WebView.this.setVisibility(View.GONE);

            // if a view already exists then immediately terminate the new one
            if (mCustomView != null) {
                callback.onCustomViewHidden();
                return;
            }

            mCustomViewContainer.addView(view);
            mCustomView = view;
            mCustomViewCallback = callback;
            mCustomViewContainer.setVisibility(View.VISIBLE);
        }

        @Override
        public void onHideCustomView() {
            System.out.println("customview hideeeeeeeeeeeeeeeeeeeeeeeeeee");
            if (mCustomView == null)
                return;        

            // Hide the custom view.
            mCustomView.setVisibility(View.GONE);

            // Remove the custom view from its container.
            mCustomViewContainer.removeView(mCustomView);
            mCustomView = null;
            mCustomViewContainer.setVisibility(View.GONE);
            mCustomViewCallback.onCustomViewHidden();

            HTML5WebView.this.setVisibility(View.VISIBLE);
            HTML5WebView.this.goBack();
            //Log.i(LOGTAG, "set it to webVew");
        }


        @Override
        public View getVideoLoadingProgressView() {
            //Log.i(LOGTAG, "here in on getVideoLoadingPregressView");

            if (mVideoProgressView == null) {
                LayoutInflater inflater = LayoutInflater.from(mContext);
                mVideoProgressView = inflater.inflate(R.layout.video_loading_progress, null);
            }
            return mVideoProgressView; 
        }

         @Override
         public void onReceivedTitle(WebView view, String title) {
            ((Activity) mContext).setTitle(title);
         }

         @Override
         public void onProgressChanged(WebView view, int newProgress) {
             ((Activity) mContext).getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress*100);
         }

         @Override
         public void onGeolocationPermissionsShowPrompt(String origin, GeolocationPermissions.Callback callback) {
             callback.invoke(origin, true, false);
         }
    }


    static final FrameLayout.LayoutParams COVER_SCREEN_PARAMS =
        new FrameLayout.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
}

custom_screen.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android">
    <FrameLayout android:id="@+id/fullscreen_custom_content"
        android:visibility="gone"
        android:background="@color/black"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />
    <LinearLayout android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout android:id="@+id/error_console"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
        />

        <FrameLayout android:id="@+id/main_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
        />
    </LinearLayout>
</FrameLayout>

video_loading_progress.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2009 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:id="@+id/progress_indicator"
         android:orientation="vertical"
         android:layout_centerInParent="true"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content">

       <ProgressBar android:id="@android:id/progress"
           style="?android:attr/progressBarStyleLarge"
           android:layout_gravity="center"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content" />

       <TextView android:paddingTop="5dip"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_gravity="center"
           android:text="@string/loading_video" android:textSize="14sp"
           android:textColor="?android:attr/textColorPrimary" />
 </LinearLayout>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/assets/res/any/http_authentication_colors.xml
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/
-->
<!-- FIXME: Change the name of this file!  It is now being used generically
    for the browser -->
<resources>
    <color name="username_text">#ffffffff</color>
    <color name="username_edit">#ff000000</color>

    <color name="password_text">#ffffffff</color>
    <color name="password_edit">#ff000000</color>

    <color name="ssl_text_label">#ffffffff</color>
    <color name="ssl_text_value">#ffffffff</color>

    <color name="white">#ffffffff</color>
    <color name="black">#ff000000</color>



    <color name="geolocation_permissions_prompt_background">#ffdddddd</color>
</resources>

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.test"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="7" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Test"
                  android:label="@string/app_name" android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:configChanges="orientation|keyboardHidden|keyboard">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>  
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_GPS" />
<uses-permission android:name="android.permission.ACCESS_ASSISTED_GPS" />
<uses-permission android:name="android.permission.ACCESS_LOCATION" />
</manifest>

Expecting rest of things you can understand.

Browser Caching of CSS files

That depends on what headers you are sending along with your CSS files. Check your server configuration as you are probably not sending them manually. Do a google search for "http caching" to learn about different caching options you can set. You can force the browser to download a fresh copy of the file everytime it loads it for instance, or you can cache the file for one week...

<xsl:variable> Print out value of XSL variable using <xsl:value-of>

Your main problem is thinking that the variable you declared outside of the template is the same variable being "set" inside the choose statement. This is not how XSLT works, the variable cannot be reassigned. This is something more like what you want:

<xsl:template match="class">
  <xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy>
  <xsl:variable name="subexists">
    <xsl:choose>
      <xsl:when test="joined-subclass">true</xsl:when>
      <xsl:otherwise>false</xsl:otherwise>
    </xsl:choose>
  </xsl:variable>
  subexists:      <xsl:value-of select="$subexists" />
</xsl:template>

And if you need the variable to have "global" scope then declare it outside of the template:

<xsl:variable name="subexists">
  <xsl:choose>
     <xsl:when test="/path/to/node/joined-subclass">true</xsl:when>
     <xsl:otherwise>false</xsl:otherwise>
  </xsl:choose>
</xsl:variable>

<xsl:template match="class">
   subexists:      <xsl:value-of select="$subexists" />
</xsl:template>

Reading specific columns from a text file in python

 
f=open(file,"r")
lines=f.readlines()
result=[]
for x in lines:
    result.append(x.split(' ')[1])
f.close()

You can do the same using a list comprehension

print([x.split(' ')[1] for x in open(file).readlines()])

Docs on split()

string.split(s[, sep[, maxsplit]])

Return a list of the words of the string s. If the optional second argument sep is absent or None, the words are separated by arbitrary strings of whitespace characters (space, tab, newline, return, formfeed). If the second argument sep is present and not None, it specifies a string to be used as the word separator. The returned list will then have one more item than the number of non-overlapping occurrences of the separator in the string.

So, you can omit the space I used and do just x.split() but this will also remove tabs and newlines, be aware of that.

XPath to select element based on childs child value

Almost there. In your predicate, you want a relative path, so change 

./book[/author/name = 'John']

to either

./book[author/name = 'John']

or

./book[./author/name = 'John']

and you will match your element. Your current predicate goes back to the root of the document to look for an author.

Extract regression coefficient values

The package broom comes in handy here (it uses the "tidy" format).

tidy(mg) will give a nicely formated data.frame with coefficients, t statistics etc. Works also for other models (e.g. plm, ...).

Example from broom's github repo:

lmfit <- lm(mpg ~ wt, mtcars)
require(broom)    
tidy(lmfit)

      term estimate std.error statistic   p.value
1 (Intercept)   37.285   1.8776    19.858 8.242e-19
2          wt   -5.344   0.5591    -9.559 1.294e-10

is.data.frame(tidy(lmfit))
[1] TRUE

Explanation of BASE terminology

ACID and BASE are consistency models for RDBMS and NoSQL respectively. ACID transactions are far more pessimistic i.e. they are more worried about data safety. In the NoSQL database world, ACID transactions are less fashionable as some databases have loosened the requirements for immediate consistency, data freshness and accuracy in order to gain other benefits, like scalability and resiliency.

BASE stands for -

  • Basic Availability - The database appears to work most of the time.
  • Soft-state - Stores don't have to be write-consistent, nor do different replicas have to be mutually consistent all the time.
  • Eventual consistency - Stores exhibit consistency at some later point (e.g., lazily at read time).

Therefore BASE relaxes consistency to allow the system to process request even in an inconsistent state.

Example: No one would mind if their tweet were inconsistent within their social network for a short period of time. It is more important to get an immediate response than to have a consistent state of users' information.

Checkbox value true/false

To return true or false depending on whether a checkbox is checked or not, I use this in JQuery

let checkState = $("#checkboxId").is(":checked") ? "true" : "false";

A button to start php script, how?

What exactly do you mean by "starts my php script"? What kind of PHP script? One to generate an HTML response for an end-user, or one that simply performs some kind of data processing task? If you are familiar with using the tag and how it interacts with PHP, then you should only need to POST to your target PHP script using an button of type "submit". If you are not familiar with forms, take a look here.

How to close form

You need the actual instance of the WindowSettings that's open, not a new one.

Currently, you are creating a new instance of WindowSettings and calling Close on that. That doesn't do anything because that new instance never has been shown.

Instead, when showing DialogSettingsCancel set the current instance of WindowSettings as the parent.

Something like this:

In WindowSettings:

private void showDialogSettings_Click(object sender, EventArgs e)
{
    var dialogSettingsCancel = new DialogSettingsCancel();
    dialogSettingsCancel.OwningWindowSettings = this;
    dialogSettingsCancel.Show();
}

In DialogSettingsCancel:

public WindowSettings OwningWindowSettings { get; set; }

private void button1_Click(object sender, EventArgs e)
{
    this.Close();
    if(OwningWindowSettings != null)
        OwningWindowSettings.Close();
}

This approach takes into account, that a DialogSettingsCancel could potentially be opened without a WindowsSettings as parent.

If the two are always connected, you should instead use a constructor parameter:

In WindowSettings:

private void showDialogSettings_Click(object sender, EventArgs e)
{
    var dialogSettingsCancel = new DialogSettingsCancel(this);
    dialogSettingsCancel.Show();
}

In DialogSettingsCancel:

WindowSettings _owningWindowSettings;

public DialogSettingsCancel(WindowSettings owningWindowSettings)
{
    if(owningWindowSettings == null)
        throw new ArgumentNullException("owningWindowSettings");

    _owningWindowSettings = owningWindowSettings;
}

private void button1_Click(object sender, EventArgs e)
{
    this.Close();
    _owningWindowSettings.Close();
}

Reset Entity-Framework Migrations

In Net Core 3.0:

I was not able to find a way to Reset Migrations.

I also ran into problems with broken migrations, and the answers provided here didn't work for me. I have a .Net Core 3.0 web API, and somewhere in the last month I edited the database directly. Yes, I did a bad, bad thing.

Strategies suggested here resulted in a number of errors in Package Manager Console:

  • A migration of that name already exists
  • Could not find the snapshot
  • 'Force' is not a recognized parameter

Granted, I may have missed a step or missed clearing out the correct files, but I found that there are ways to clean this up without as much brute force:

  • Remove-Migration from the PMC for each migration by name, in reverse order of creation, up to and including the broken migration
  • Add-Migration to create a new migration which will be the delta between the last good migration up to the current schema

Now when the web API is started with an empty database, it correctly creates all the tables and properties to match the entity models.

HTH!

javascript regex - look behind alternative?

EDIT: From ECMAScript 2018 onwards, lookbehind assertions (even unbounded) are supported natively.

In previous versions, you can do this:

^(?:(?!filename\.js$).)*\.js$

This does explicitly what the lookbehind expression is doing implicitly: check each character of the string if the lookbehind expression plus the regex after it will not match, and only then allow that character to match.

^                 # Start of string
(?:               # Try to match the following:
 (?!              # First assert that we can't match the following:
  filename\.js    # filename.js 
  $               # and end-of-string
 )                # End of negative lookahead
 .                # Match any character
)*                # Repeat as needed
\.js              # Match .js
$                 # End of string

Another edit:

It pains me to say (especially since this answer has been upvoted so much) that there is a far easier way to accomplish this goal. There is no need to check the lookahead at every character:

^(?!.*filename\.js$).*\.js$

works just as well:

^                 # Start of string
(?!               # Assert that we can't match the following:
 .*               # any string, 
  filename\.js    # followed by filename.js
  $               # and end-of-string
)                 # End of negative lookahead
.*                # Match any string
\.js              # Match .js
$                 # End of string

Creating a system overlay window (always on top)

by using service you can achieve this : 

public class PopupService extends Service{

    private static final String TAG = PopupService.class.getSimpleName();
    WindowManager mWindowManager;
    View mView;
    String type ;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
//        registerOverlayReceiver();
        type = intent.getStringExtra("type");
        Utils.printLog("type = "+type);
        showDialog(intent.getStringExtra("msg"));
        return super.onStartCommand(intent, flags, startId);
    }

    private void showDialog(String aTitle)
    {
        if(type.equals("when screen is off") | type.equals("always"))
        {
            Utils.printLog("type = "+type);
            PowerManager pm = (PowerManager) getApplicationContext().getSystemService(Context.POWER_SERVICE);
            WakeLock mWakeLock = pm.newWakeLock((PowerManager.SCREEN_DIM_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP), "YourServie");
            mWakeLock.acquire();
            mWakeLock.release();
        }

        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mView = View.inflate(getApplicationContext(), R.layout.dialog_popup_notification_received, null);
        mView.setTag(TAG);

        int top = getApplicationContext().getResources().getDisplayMetrics().heightPixels / 2;

        LinearLayout dialog = (LinearLayout) mView.findViewById(R.id.pop_exit);
//        android.widget.LinearLayout.LayoutParams lp = (android.widget.LinearLayout.LayoutParams) dialog.getLayoutParams();
//        lp.topMargin = top;
//        lp.bottomMargin = top;
//        mView.setLayoutParams(lp);

        final EditText etMassage = (EditText) mView.findViewById(R.id.editTextInPopupMessageReceived);

        ImageButton imageButtonSend = (ImageButton) mView.findViewById(R.id.imageButtonSendInPopupMessageReceived);
//        lp = (LayoutParams) imageButton.getLayoutParams();
//        lp.topMargin = top - 58;
//        imageButton.setLayoutParams(lp);
        imageButtonSend.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Utils.printLog("clicked");
//                mView.setVisibility(View.INVISIBLE);
                if(!etMassage.getText().toString().equals(""))
                {
                    Utils.printLog("sent");
                    etMassage.setText("");
                }
            }
        });

        TextView close = (TextView) mView.findViewById(R.id.TextViewCloseInPopupMessageReceived);
        close.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                hideDialog();   
            }
        });

        TextView view = (TextView) mView.findViewById(R.id.textviewViewInPopupMessageReceived);
        view.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                hideDialog();   
            }
        });

        TextView message = (TextView) mView.findViewById(R.id.TextViewMessageInPopupMessageReceived);
        message.setText(aTitle);

        final WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT,
        ViewGroup.LayoutParams.MATCH_PARENT, 0, 0,
        WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
        WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
//                | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON ,
        PixelFormat.RGBA_8888);

        mView.setVisibility(View.VISIBLE);
        mWindowManager.addView(mView, mLayoutParams);
        mWindowManager.updateViewLayout(mView, mLayoutParams);

    }

    private void hideDialog(){
        if(mView != null && mWindowManager != null){
            mWindowManager.removeView(mView);
            mView = null;
        }
    }
}

Split string with string as delimiter

Try this:

for /F "tokens=1,3 delims=. " %%a in ("%string%") do (
   echo %%a
   echo %%b
)

that is, take the first and third tokens delimited by space or point...

Permission denied error while writing to a file in Python

To answer your first question: yes, if the file is not there Python will create it.

Secondly, the user (yourself) running the python script doesn't have write privileges to create a file in the directory.

Is jQuery $.browser Deprecated?

From the documentation:

The $.browser property is deprecated in jQuery 1.3, and its functionality may be moved to a team-supported plugin in a future release of jQuery.

So, yes, it is deprecated, but your existing implementations will continue to work. If the functionality is removed, it will likely be easily accessible using a plugin.

As to whether there is an alternative... The answer is "yes, probably". It is far, far better to do feature detection using $.support rather than browser detection: detect the actual feature you need, not the browser that provides it. Most important features that vary from browser to browser are detected with that.

Update 16 February 2013: In jQuery 1.9, this feature was removed (docs). It is far better not to use it. If you really, really must use its functionality, you can restore it with the jQuery Migrate plugin.

How can I add the sqlite3 module to Python?

Normally, it is included. However, as @ngn999 said, if your python has been built from source manually, you'll have to add it.

Here is an example of a script that will setup an encapsulated version (virtual environment) of Python3 in your user directory with an encapsulated version of sqlite3.

INSTALL_BASE_PATH="$HOME/local"
cd ~
mkdir build
cd build
[ -f Python-3.6.2.tgz ] || wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz
tar -zxvf Python-3.6.2.tgz

[ -f sqlite-autoconf-3240000.tar.gz ] || wget https://www.sqlite.org/2018/sqlite-autoconf-3240000.tar.gz
tar -zxvf sqlite-autoconf-3240000.tar.gz

cd sqlite-autoconf-3240000
./configure --prefix=${INSTALL_BASE_PATH}
make
make install

cd ../Python-3.6.2
LD_RUN_PATH=${INSTALL_BASE_PATH}/lib configure
LDFLAGS="-L ${INSTALL_BASE_PATH}/lib"
CPPFLAGS="-I ${INSTALL_BASE_PATH}/include"
LD_RUN_PATH=${INSTALL_BASE_PATH}/lib make
./configure --prefix=${INSTALL_BASE_PATH}
make
make install

cd ~
LINE_TO_ADD="export PATH=${INSTALL_BASE_PATH}/bin:\$PATH"
if grep -q -v "${LINE_TO_ADD}" $HOME/.bash_profile; then echo "${LINE_TO_ADD}" >> $HOME/.bash_profile; fi
source $HOME/.bash_profile

Why do this? You might want a modular python environment that you can completely destroy and rebuild without affecting your managed package installation. This would give you an independent development environment. In this case, the solution is to install sqlite3 modularly too.

C# Reflection: How to get class reference from string?

A simple use:

Type typeYouWant = Type.GetType("NamespaceOfType.TypeName, AssemblyName");

Sample:

Type dogClass = Type.GetType("Animals.Dog, Animals");

setSupportActionBar toolbar cannot be applied to (android.widget.Toolbar) error

For adding a ToolBar that supports Material Design, the official documentation directions are probably the best to follow.

  1. Add the v7 appcompat support library.

  2. Make your activity extend AppCompatActivity.

    public class MyActivity extends AppCompatActivity {
  // ...
}

  3. Declare NoActionBar in the Manifest.

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

  4. Add a toolbar to your activity's xml layout.

    <android.support.v7.widget.Toolbar
   android:id="@+id/my_toolbar"
   android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
   ...
   />

  5. Call setSupportActionBar in the activity's onCreate.

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);
    Toolbar myToolbar = (Toolbar) findViewById(R.id.my_toolbar);
    setSupportActionBar(myToolbar);
}

Note: You will have to import the following in the activity.

import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

Unable instantiate android.gms.maps.MapFragment

In my Intellij Idea project I had to add both: google-play-services_lib and google-play-services.jar to the project. And in google-play-services_lib project add google-play-services.jar too. After that, if you did all things, that described here, right, your application should be working.

How to empty (clear) the logcat buffer in Android

For anyone coming to this question wondering how to do this in Eclipse, You can remove the displayed text from the logCat using the button provided (often has a red X on the icon)

jquery remove "selected" attribute of option?

The question is asked in a misleading manner. "Removing the selected attribute" and "deselecting all options" are entirely different things.

To deselect all options in a documented, cross-browser manner use either

$("select").val([]);

or

// Note the use of .prop instead of .attr
$("select option").prop("selected", false);

How to Refresh a Component in Angular

One more way without explicit route: 

async reload(url: string): Promise<boolean> {
  await this.router.navigateByUrl('.', { skipLocationChange: true });
  return this.router.navigateByUrl(url);
}

Disable activity slide-in animation when launching new activity?

In my opinion the best answer is to use "overridePendingTransition(0, 0);"

to avoid seeing animation when you want to Intent to an Activity use:

this.startActivity(new Intent(v.getContext(), newactivity.class));
this.overridePendingTransition(0, 0);

and to not see the animation when you press back button Override onPause method in your newactivity 

@Override
protected void onPause() {
    super.onPause();
    overridePendingTransition(0, 0);
}

How to include css files in Vue 2

Try using the @ symbol before the url string. Import your css in the following manner:

import Vue from 'vue'

require('@/assets/styles/main.css')

In your App.vue file you can do this to import a css file in the style tag

<template>
  <div>
  </div>
</template>

<style scoped src="@/assets/styles/mystyles.css">
</style>

How to create a file with a given size in Linux?

This will generate 4 MB text file with random characters in current directory and its name "4mb.txt" You can change parameters to generate different sizes and names.

base64 /dev/urandom | head -c 4000000 > 4mb.txt

Encrypt & Decrypt using PyCrypto AES 256

For someone who would like to use urlsafe_b64encode and urlsafe_b64decode, here are the version that're working for me (after spending some time with the unicode issue)

BS = 16
key = hashlib.md5(settings.SECRET_KEY).hexdigest()[:BS]
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[:-ord(s[len(s)-1:])]

class AESCipher:
    def __init__(self, key):
        self.key = key

    def encrypt(self, raw):
        raw = pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return base64.urlsafe_b64encode(iv + cipher.encrypt(raw)) 

    def decrypt(self, enc):
        enc = base64.urlsafe_b64decode(enc.encode('utf-8'))
        iv = enc[:BS]
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return unpad(cipher.decrypt(enc[BS:]))

How to make a JSON call to a url?

In modern-day JS, you can get your JSON data by calling ES6's fetch() on your URL and then using ES7's async/await to "unpack" the Response object from the fetch to get the JSON data like so:

_x000D_
_x000D_ 
const getJSON = async url => {
  try {
    const response = await fetch(url);
    if(!response.ok) // check if response worked (no 404 errors etc...)
      throw new Error(response.statusText);

    const data = await response.json(); // get JSON from the response
    return data; // returns a promise, which resolves to this data value
  } catch(error) {
    return error;
  }
}

console.log("Fetching data...");
getJSON("https://soundcloud.com/oembed?url=http%3A//soundcloud.com/forss/flickermood&format=json").then(data => {
  console.log(data);
}).catch(error => {
  console.error(error);
});
_x000D_
_x000D_
_x000D_

The above method can be simplified down to a few lines if you ignore the exception/error handling (usually not recommended as this can lead to unwanted errors):

_x000D_
_x000D_ 
const getJSON = async url => {
  const response = await fetch(url);
  return response.json(); // get JSON from the response 
}

console.log("Fetching data...");
getJSON("https://soundcloud.com/oembed?url=http%3A//soundcloud.com/forss/flickermood&format=json")
  .then(data => console.log(data));
_x000D_
_x000D_
_x000D_

Excel formula to get week number in month (having Monday)

Jonathan from the ExcelCentral forums suggests:

=WEEKNUM(A1,2)-WEEKNUM(DATE(YEAR(A1),MONTH(A1),1),2)+1

This formula extracts the week of the year [...] and then subtracts it from the week of the first day in the month to get the week of the month. You can change the day that weeks begin by changing the second argument of both WEEKNUM functions (set to 2 [for Monday] in the above example). For weeks beginning on Sunday, use: 

=WEEKNUM(A1,1)-WEEKNUM(DATE(YEAR(A1),MONTH(A1),1),1)+1

For weeks beginning on Tuesday, use: 

=WEEKNUM(A1,12)-WEEKNUM(DATE(YEAR(A1),MONTH(A1),1),12)+1

etc.

I like it better because it's using the built in week calculation functionality of Excel (WEEKNUM).

How do I install g++ on MacOS X?

Download Xcode, which is free with an ADC online membership (also free):

http://developer.apple.com/technology/xcode.html

How to initialize struct?

  1. Will "length" ever deviate from the real length of "s". If the answer is no, then you don't need to store length, because strings store their length already, and you can just call s.Length.

  2. To get the syntax you asked for, you can implement an "implicit" operator like so:

    static implicit operator MyStruct(string s) {
    return new MyStruct(...);
}

  3. The implicit operator will work, regardless of whether you make your struct mutable or not.

making a paragraph in html contain a text from a file

I would use javascript for this.

var txtFile = new XMLHttpRequest();
txtFile.open("GET", "http://my.remote.url/myremotefile.txt", true);
txtFile.onreadystatechange = function() {
  if (txtFile.readyState === 4 && txtFile.status == 200) {
     allText = txtFile.responseText;
  }
document.getElementById('your div id').innerHTML = allText;

This is just a code sample, would need tweaking for all browsers, etc.

How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?

One way I found after some struggling is creating a function which gets data_plot matrix, file name and order as parameter to create boxplots from the given data in the ordered figure (different orders = different figures) and save it under the given file_name.

def plotFigure(data_plot,file_name,order):
    fig = plt.figure(order, figsize=(9, 6))
    ax = fig.add_subplot(111)
    bp = ax.boxplot(data_plot)
    fig.savefig(file_name, bbox_inches='tight')
    plt.close()

How to disable the back button in the browser using JavaScript

 
history.pushState(null, null, document.title);
window.addEventListener('popstate', function () {
    history.pushState(null, null, document.title);
});

This script will overwrite attempts to navigate back and forth with the state of the current page.

Update:

Some users have reported better success with using document.URL instead of document.title:

history.pushState(null, null, document.URL);
window.addEventListener('popstate', function () {
    history.pushState(null, null, document.URL);
});

Python Error: "ValueError: need more than 1 value to unpack"

You have to pass the arguments in the terminal in order to store them in 'argv'. This variable holds the arguments you pass to your Python script when you run it. It later unpacks the arguments and store them in different variables you specify in the program e.g.

script, first, second = argv
print "Your file is:", script
print "Your first entry is:", first
print "Your second entry is:" second

Then in your command line you have to run your code like this,

$python ex14.py Hamburger Pizza

Your output will look like this: 

Your file is: ex14.py
Your first entry is: Hamburger
Your second entry is: Pizza

Could not resolve all dependencies for configuration ':classpath'

you should have gradle.properties file defined for the build with proxy settings so that gradle knows how to use http connection

# This file contains the basics for Maven Version control and will be used by the Artifactory Release management
# These settings are for the root project and all sub-projects in this application
releaseVersion=1.0.0-SNAPSHOT
releaseGroup=com.xx.xx.xx
artifactory_user=
artifactory_password=
artifactory_contextUrl=https://artifactory.xxxx.com/artifactory/
systemProp.http.proxyHost=proxy.xxx.com
systemProp.http.proxyPort=8080
systemProp.https.proxyHost=proxy.xxx.com
systemProp.https.proxyPort=8080
systemProp.http.nonProxyHosts=*.xxx.com|localhost|*.int.targoe.com
org.gradle.java.home=C:\\Program Files (x86)\\Java\\jdk1.8.0_121

PostgreSQL: FOREIGN KEY/ON DELETE CASCADE

Excerpt from PostgreSQL documentation:

Restricting and cascading deletes are the two most common options. [...] CASCADE specifies that when a referenced row is deleted, row(s) referencing it should be automatically deleted as well.

This means that if you delete a category – referenced by books – the referencing book will also be deleted by ON DELETE CASCADE.

Example:

CREATE SCHEMA shire;

CREATE TABLE shire.clans (
    id serial PRIMARY KEY,
    clan varchar
);

CREATE TABLE shire.hobbits (
    id serial PRIMARY KEY,
    hobbit varchar,
    clan_id integer REFERENCES shire.clans (id) ON DELETE CASCADE
);

DELETE FROM clans will CASCADE to hobbits by REFERENCES.

sauron@mordor> psql
sauron=# SELECT * FROM shire.clans;
 id |    clan    
----+------------
  1 | Baggins
  2 | Gamgi
(2 rows)

sauron=# SELECT * FROM shire.hobbits;
 id |  hobbit  | clan_id 
----+----------+---------
  1 | Bilbo    |       1
  2 | Frodo    |       1
  3 | Samwise  |       2
(3 rows)

sauron=# DELETE FROM shire.clans WHERE id = 1 RETURNING *;
 id |  clan   
----+---------
  1 | Baggins
(1 row)

DELETE 1
sauron=# SELECT * FROM shire.hobbits;
 id |  hobbit  | clan_id 
----+----------+---------
  3 | Samwise  |       2
(1 row)

If you really need the opposite (checked by the database), you will have to write a trigger!

SQLSTATE[28000] [1045] Access denied for user 'root'@'localhost' (using password: YES) Symfony2

You need to set the password for root@localhost to be blank. There are two ways:

  • The MySQL SET PASSWORD command:

    SET PASSWORD FOR root@localhost=PASSWORD('');

  • Using the command-line mysqladmin tool:

    mysqladmin -u root -pCURRENTPASSWORD password ''

Standard way to embed version into python package?

I also saw another style:

>>> django.VERSION
(1, 1, 0, 'final', 0)

Should I always use a parallel stream when possible?

Other answers have already covered profiling to avoid premature optimization and overhead cost in parallel processing. This answer explains the ideal choice of data structures for parallel streaming.

As a rule, performance gains from parallelism are best on streams over ArrayList , HashMap , HashSet , and ConcurrentHashMap instances; arrays; int ranges; and long ranges. What these data structures have in common is that they can all be accurately and cheaply split into subranges of any desired sizes, which makes it easy to divide work among parallel threads. The abstraction used by the streams library to perform this task is the spliterator , which is returned by the spliterator method on Stream and Iterable.

Another important factor that all of these data structures have in common is that they provide good-to-excellent locality of reference when processed sequentially: sequential element references are stored together in memory. The objects referred to by those references may not be close to one another in memory, which reduces locality-of-reference. Locality-of-reference turns out to be critically important for parallelizing bulk operations: without it, threads spend much of their time idle, waiting for data to be transferred from memory into the processor’s cache. The data structures with the best locality of reference are primitive arrays because the data itself is stored contiguously in memory.

Source: Item #48 Use Caution When Making Streams Parallel, Effective Java 3e by Joshua Bloch

set the iframe height automatically

Solomon's answer about bootstrap inspired me to add the CSS the bootstrap solution uses, which works really well for me.

.iframe-embed {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    height: 100%;
    width: 100%;
    border: 0;
}
.iframe-embed-wrapper {
    position: relative;
    display: block;
    height: 0;
    padding: 0;
    overflow: hidden;
}
.iframe-embed-responsive-16by9 {
    padding-bottom: 56.25%;
}
<div class="iframe-embed-wrapper iframe-embed-responsive-16by9">
    <iframe class="iframe-embed" src="vid.mp4"></iframe>
</div>

Upload Progress Bar in PHP

HTML5 introduced a file upload api that allows you to monitor the progress of file uploads but for older browsers there's plupload a framework that specifically made to monitor file uploads and give information about them. plus it has plenty of callbacks so it can work across all browsers

Why should I prefer to use member initialization lists?

Just to add some additional info to demonstrate how much difference the member initialization list can mak. In the leetcode 303 Range Sum Query - Immutable, https://leetcode.com/problems/range-sum-query-immutable/, where you need to construct and initialize to zero a vector with certain size. Here is two different implementation and speed comparison.

Without member initialization list, to get AC it cost me about 212 ms.

class NumArray {
public:
vector<int> preSum;
NumArray(vector<int> nums) {
    preSum = vector<int>(nums.size()+1, 0);
    int ps = 0;
    for (int i = 0; i < nums.size(); i++)
    {
        ps += nums[i];
        preSum[i+1] = ps;
    }
}

int sumRange(int i, int j) {
    return preSum[j+1] - preSum[i];
}
};

Now using member initialization list, the time to get AC is about 108 ms. With this simple example, it is quite obvious that, member initialization list is way more efficient. All the measurement is from the running time from LC.

class NumArray {
public:
vector<int> preSum;
NumArray(vector<int> nums) : preSum(nums.size()+1, 0) { 
    int ps = 0;
    for (int i = 0; i < nums.size(); i++)
    {
        ps += nums[i];
        preSum[i+1] = ps;
    }
}

int sumRange(int i, int j) {
    return preSum[j+1] - preSum[i];
}
};

Is there a way to 'uniq' by column?

If you want to retain the last one of the duplicates you could use

 tac a.csv | sort -u -t, -r -k1,1 |tac

Which was my requirement

here

tac will reverse the file line by line

How to convert datatype:object to float64 in python?

Or you can use regular expression to handle multiple items as the general case of this issue, 

df['2nd'] = pd.to_numeric(df['2nd'].str.replace(r'[,.%]','')) 
df['CTR'] = pd.to_numeric(df['CTR'].str.replace(r'[^\d%]',''))

How can I check if a background image is loaded?

I have a jQuery plugin called waitForImages that can detect when background images have downloaded.

$('body')
  .css('background-image','url(http://picture.de/image.png)')
  .waitForImages(function() {
    alert('Background image done loading');
    // This *does* work
  }, $.noop, true);

WARNING: Setting property 'source' to 'org.eclipse.jst.jee.server:appname' did not find a matching property

You can change the eclipse tomcat server configuration. Open the server view, double click on you server to open server configuration. Then click to activate "Publish module contents to separate XML files". Finally, restart your server, the message must disappear.

Source: http://www.albeesonline.com/blog/2008/11/29/warning-setpropertiesruleserverserviceenginehostcontext-setting-property/

Release generating .pdb files, why?

Debug symbols (.pdb) and XML doc (.xml) files make up a large percentage of the total size and should not be part of the regular deployment package. But it should be possible to access them in case they are needed.

One possible approach: at the end of the TFS build process, move them to a separate artifact.

Python csv string to array

As others have already pointed out, Python includes a module to read and write CSV files. It works pretty well as long as the input characters stay within ASCII limits. In case you want to process other encodings, more work is needed.

The Python documentation for the csv module implements an extension of csv.reader, which uses the same interface but can handle other encodings and returns unicode strings. Just copy and paste the code from the documentation. After that, you can process a CSV file like this:

with open("some.csv", "rb") as csvFile: 
    for row in UnicodeReader(csvFile, encoding="iso-8859-15"):
        print row

Automatically accept all SDK licences

On Mac OSX, navigate to the sdk/tools/bin

Then run ./sdkmanager --licenses, and accept all the licenses.

Web API optional parameters

you need only set default value to parameters(you do not need the Route attribute):

public IHttpActionResult Get(string apc = null, string xpc = null, int? sku = null)
{ ... }

Updating the list view when the adapter data changes

I found a solution that is more efficient than currently accepted answer, because current answer forces all list elements to be refreshed. My solution will refresh only one element (that was touched) by calling adapters getView and recycling current view which adds even more efficiency.

mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
      // Edit object data that is represented in Viewat at list's "position"
      view = mAdapter.getView(position, view, parent);
    }
});

C++ code file extension? .cc vs .cpp

I personally use .cc extension for implementation files, .hh for headers, and .inl for inline/templates.

As said before, it is mainly a matter of taste.

From what I've seen, .cc seems to be more "open source projects oriented", as it is advised in some great open source software coding styles, whereas .cpp seems to be more Windowish.

--- EDIT

As mentioned, this is "from what i've seen", it may be wrong. It's just that all Windows projects I've worked on used .cpp, and a lot of open source projects (which are mainly on unix-likes) use .cc.

Examples coding styles using .cc:

WebDriver - wait for element using Java

We're having a lot of race conditions with elementToBeClickable. See https://github.com/angular/protractor/issues/2313. Something along these lines worked reasonably well even if a little brute force

Awaitility.await()
        .atMost(timeout)
        .ignoreException(NoSuchElementException.class)
        .ignoreExceptionsMatching(
            Matchers.allOf(
                Matchers.instanceOf(WebDriverException.class),
                Matchers.hasProperty(
                    "message",
                    Matchers.containsString("is not clickable at point")
                )
            )
        ).until(
            () -> {
                this.driver.findElement(locator).click();
                return true;
            },
            Matchers.is(true)
        );

Get div to take up 100% body height, minus fixed-height header and footer

This still came up as the top Google result when I was trying to find an answer to this question. I didn't have to support older browsers in my project and I feel like I found a better, simpler solution in flex-box. The CSS snippet below is all that is necessary.

I have also shown how to make the main content scrollable if the screen height is too small.

_x000D_
_x000D_ 
html,_x000D_
body {_x000D_
  height: 100%;_x000D_
  display: flex;_x000D_
  flex-direction: column;_x000D_
}_x000D_
header {_x000D_
  min-height: 60px;_x000D_
}_x000D_
main {_x000D_
  flex-grow: 1;_x000D_
  overflow: auto;_x000D_
}_x000D_
footer {_x000D_
  min-height: 30px;_x000D_
}
_x000D_ 
<body style="margin: 0px; font-family: Helvetica; font-size: 18px;">_x000D_
  <header style="background-color: lightsteelblue; padding: 2px;">Hello</header>_x000D_
  <main style="overflow: auto; background-color: lightgrey; padding: 2px;">_x000D_
    <article style="height: 400px;">_x000D_
      Goodbye_x000D_
    </article>_x000D_
  </main>_x000D_
  <footer style="background-color: lightsteelblue; padding: 2px;">I don't know why you say, "Goodbye"; I say, "Hello."</footer>_x000D_
</body>
_x000D_
_x000D_
_x000D_

jquery loop on Json data using $.each

 
$.each(JSON.parse(result), function(i, item) {
    alert(item.number);
});

Get total size of file in bytes

You can use the length() method on File which returns the size in bytes.

Cannot assign requested address - possible causes?

 
sysctl -w net.ipv4.tcp_timestamps=1
sysctl -w net.ipv4.tcp_tw_recycle=1

How can I use grep to find a word inside a folder?

The answer you selected is fine, and it works, but it isn't the correct way to do it, because:

grep -nr yourString* .

This actually searches the string "yourStrin" and "g" 0 or many times.

So the proper way to do it is:

grep -nr \w*yourString\w* .

This command searches the string with any character before and after on the current folder.

Adding an image to a PDF using iTextSharp and scale it properly

Personally, I use something close from fubo's solution and it works well:

image.ScaleToFit(document.PageSize);
image.SetAbsolutePosition(0,0);

Gerrit error when Change-Id in commit messages are missing

If you need to add Change-Id to multiple commits, you can download the hook from your Gerrit server and run these commands to add the Change-Ids to all commits that need them at once. The example below fixes all commits on your current branch that have not yet been pushed to the upstream branch.

tmp=$(mktemp)
hook=$(readlink -f $(git rev-parse --git-dir))/hooks/commit-msg
git filter-branch -f --msg-filter "cat > $tmp; \"$hook\" $tmp; cat $tmp" @{u}..HEAD

How to execute Python code from within Visual Studio Code

Here is how to configure Task Runner in Visual Studio Code to run a .py file.

In your console, press Ctrl + Shift + P (Windows) or Cmd + Shift + P (Apple). This brings up a search box where you search for "Configure Task Runner"

Enter image description here

If this is the first time you open the "Task: Configure Task Runner", you need to select "other" at the bottom of the next selection list.

This will bring up the properties which you can then change to suit your preference. In this case you want to change the following properties;

  1. Change the Command property from "tsc" (TypeScript) to "Python"
  2. Change showOutput from "silent" to "Always"
  3. Change args (Arguments) from ["Helloworld.ts"] to ["${file}"] (filename)
  4. Delete the last property problemMatcher
  5. Save the changes made

Enter image description here

You can now open your .py file and run it nicely with the shortcut Ctrl + Shift + B (Windows) or Cmd + Shift + B (Apple).

How can I format a String number to have commas and round?

I've created my own formatting utility. Which is extremely fast at processing the formatting along with giving you many features :)

It supports:

  • Comma Formatting E.g. 1234567 becomes 1,234,567.
  • Prefixing with "Thousand(K),Million(M),Billion(B),Trillion(T)".
  • Precision of 0 through 15.
  • Precision re-sizing (Means if you want 6 digit precision, but only have 3 available digits it forces it to 3).
  • Prefix lowering (Means if the prefix you choose is too large it lowers it to a more suitable prefix).

The code can be found here. You call it like this:

public static void main(String[])
{
   int settings = ValueFormat.COMMAS | ValueFormat.PRECISION(2) | ValueFormat.MILLIONS;
   String formatted = ValueFormat.format(1234567, settings);
}

I should also point out this doesn't handle decimal support, but is very useful for integer values. The above example would show "1.23M" as the output. I could probably add decimal support maybe, but didn't see too much use for it since then I might as well merge this into a BigInteger type of class that handles compressed char[] arrays for math computations.

WCF Error - Could not find default endpoint element that references contract 'UserService.UserService'

Not sure if it's really a problem, but I see you have the same name for your binding configuration ().

I usually try to call my endpoints something like "UserServiceBasicHttp" or something similar (the "Binding" really doesn't have anything to do here), and I try to call my binding configurations something with "....Configuration", e.g. "UserServiceDefaultBinding", to avoid any potential name clashes.

Marc

How to customize the background color of a UITableViewCell?

Simply put this in you UITableView delegate class file (.m):

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell  forRowAtIndexPath:(NSIndexPath *)indexPath 
{
    UIColor *color = ((indexPath.row % 2) == 0) ? [UIColor colorWithRed:255.0/255 green:255.0/255 blue:145.0/255 alpha:1] : [UIColor clearColor];
    cell.backgroundColor = color;
}

SSIS Connection Manager Not Storing SQL Password

I use a variable to store the entire connection string and pass it into the ConnectionString expression. This overwrites all settings for the connection and allows you store the password.

How to open google chrome from terminal?

On Linux, just use this command in a terminal:

google-chrome

Set Response Status Code

Since PHP 5.4 you can use http_response_code.

http_response_code(404);

This will take care of setting the proper HTTP headers.

If you are running PHP < 5.4 then you have two options:

  1. Upgrade.
  2. Use this http_response_code function implemented in PHP.

PowerShell: Create Local User Account

As of PowerShell 5.1 there cmdlet New-LocalUser which could create local user account.

Example of usage:

Create a user account

New-LocalUser -Name "User02" -Description "Description of this account." -NoPassword

or Create a user account that has a password

$Password = Read-Host -AsSecureString
New-LocalUser "User03" -Password $Password -FullName "Third User" -Description "Description of this account."

or Create a user account that is connected to a Microsoft account

New-LocalUser -Name "MicrosoftAccount\usr [email protected]" -Description "Description of this account."

How to print a string at a fixed width?

This will Help to Keep a fixed length when you want to print several elements at one print statement

25s format a string with 25 spaces, left justified by default

5d format an integer reserving 5 spaces, right justified by default

members=["Niroshan","Brayan","Kate"]
print("__________________________________________________________________")
print('{:25s} {:32s} {:35s} '.format("Name","Country","Age"))
print("__________________________________________________________________")
print('{:25s} {:30s} {:5d} '.format(members[0],"Srilanka",20))
print('{:25s} {:30s} {:5d} '.format(members[1],"Australia",25))
print('{:25s} {:30s} {:5d} '.format(members[2],"England",30))
print("__________________________________________________________________")

25s format a string with 25 spaces, left justified by default

5d format an integer reserving 5 spaces, right justified by default

And this will print

__________________________________________________________________
Name                      Country                          Age
__________________________________________________________________
Niroshan                  Srilanka                          20
Brayan                    Australia                         25
Kate                      England                           30
__________________________________________________________________

Copy/duplicate database without using mysqldump

I don't really know what you mean by "local access". But for that solution you need to be able to access over ssh the server to copy the files where is database is stored.

I cannot use mysqldump, because my database is big (7Go, mysqldump fail) If the version of the 2 mysql database is too different it might not work, you can check your mysql version using mysql -V.

1) Copy the data from your remote server to your local computer (vps is the alias to your remote server, can be replaced by [email protected]) 

ssh vps:/etc/init.d/mysql stop
scp -rC vps:/var/lib/mysql/ /tmp/var_lib_mysql
ssh vps:/etc/init.d/apache2 start

2) Import the data copied on your local computer

/etc/init.d/mysql stop
sudo chown -R mysql:mysql /tmp/var_lib_mysql
sudo nano /etc/mysql/my.cnf
-> [mysqld]
-> datadir=/tmp/var_lib_mysql
/etc/init.d/mysql start

If you have a different version, you may need to run

/etc/init.d/mysql stop
mysql_upgrade -u root -pPASSWORD --force #that step took almost 1hrs
/etc/init.d/mysql start

How to format a date using ng-model?

I use the following directive that makes me and most users very happy! It uses moment for parsing and formatting. It looks a little bit like the one by SunnyShah, mentioned earlier.

angular.module('app.directives')

.directive('appDatetime', function ($window) {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function (scope, element, attrs, ngModel) {
            var moment = $window.moment;

            ngModel.$formatters.push(formatter);
            ngModel.$parsers.push(parser);

            element.on('change', function (e) {
                var element = e.target;
                element.value = formatter(ngModel.$modelValue);
            });

            function parser(value) {
                var m = moment(value);
                var valid = m.isValid();
                ngModel.$setValidity('datetime', valid);
                if (valid) return m.valueOf();
                else return value;
            }

            function formatter(value) {
                var m = moment(value);
                var valid = m.isValid();
                if (valid) return m.format("LLLL");
                else return value;

            }

        } //link
    };

}); //appDatetime

In my form i use it like this:

<label>begin: <input type="text" ng-model="doc.begin" app-datetime required /></label>
<label>end: <input type="text" ng-model="doc.end" app-datetime required /></label>

This will bind a timestamp (milliseconds since 1970) to doc.begin and doc.end.

ImportError: cannot import name NUMPY_MKL

Reinstall numpy-1.11.0_XXX.whl (for your Python) from www.lfd.uci.edu/~gohlke/pythonlibs. This file has the same name and version if compare with the variant downloaded by me earlier 29.03.2016, but its size and content differ from old variant. After re-installation error disappeared.

Second option - return back to scipy 0.17.0 from 0.17.1

P.S. I use Windows 64-bit version of Python 3.5.1, so can't guarantee that numpy for Python 2.7 is already corrected.

How do I change the figure size with subplots?

Alternatively, create a figure() object using the figsize argument and then use add_subplot to add your subplots. E.g.

import matplotlib.pyplot as plt
import numpy as np

f = plt.figure(figsize=(10,3))
ax = f.add_subplot(121)
ax2 = f.add_subplot(122)
x = np.linspace(0,4,1000)
ax.plot(x, np.sin(x))
ax2.plot(x, np.cos(x), 'r:')

Simple Example

Benefits of this method are that the syntax is closer to calls of subplot() instead of subplots(). E.g. subplots doesn't seem to support using a GridSpec for controlling the spacing of the subplots, but both subplot() and add_subplot() do.

iOS start Background Thread

If you use performSelectorInBackground:withObject: to spawn a new thread, then the performed selector is responsible for setting up the new thread's autorelease pool, run loop and other configuration details – see "Using NSObject to Spawn a Thread" in Apple's Threading Programming Guide.

You'd probably be better off using Grand Central Dispatch, though:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    [self getResultSetFromDB:docids];
});

GCD is a newer technology, and is more efficient in terms of memory overhead and lines of code.

Updated with a hat tip to Chris Nolet, who suggested a change that makes the above code simpler and keeps up with Apple's latest GCD code examples.

How to make sure that string is valid JSON using JSON.NET

This method doesn't require external libraries

using System.Web.Script.Serialization;
bool IsValidJson(string json)
    {
        try {
            var serializer = new JavaScriptSerializer();
            dynamic result = serializer.DeserializeObject(json);
            return true;
        } catch { return false; }
    }

Java: Getting a substring from a string starting after a particular character

You can use Apache commons:

For substring after last occurrence use this method.

And for substring after first occurrence equivalent method is here.

Laravel 5 Carbon format datetime

If you are using eloquent model (by looking at your code, i think you are), you dont need to convert it into array. Just use it as object. Becaus elike Thomas Kim said, by default it is a Carbon instance

So it should be 

$suborder['payment_date'] = $item->created_at->format('Y-m-d')

But if it is not then, you need convert it to Carbon object as Milan Maharjan answer

$createdAt = Carbon::parse($item['created_at']);

What is the best (and safest) way to merge a Git branch into master?

@KingCrunch's answer should work in many cases. One issue that can arise is you may be on a different machine that needs to pull the latest from test. So, I recommend pulling test first. The revision looks like this:

git checkout test
git pull
git checkout master
git pull origin master
git merge test
git push origin master

Extract specific columns from delimited file using Awk

Not using awk but the simplest way I was able to get this done was to just use csvtool. I had other use cases as well to use csvtool and it can handle the quotes or delimiters appropriately if they appear within the column data itself.

csvtool format '%(2)\n' input.csv
csvtool format '%(2),%(3),%(4)\n' input.csv

Replacing 2 with the column number will effectively extract the column data you are looking for.

TypeError: $ is not a function WordPress

jQuery might be missing.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>

Checking oracle sid and database name

As has been mentioned above, 

select global_name from global_name;

is the way to go.

You couldn't query v$database/v$instance/v$thread because your user does not have the required permissions. You can grant them (via a DBA account) with:

grant select on v$database to <username here>;

VBA setting the formula for a cell

Try:

.Formula = "='" & strProjectName & "'!" & Cells(2, 7).Address

If your worksheet name (strProjectName) has spaces, you need to include the single quotes in the formula string.

If this does not resolve it, please provide more information about the specific error or failure.

Update

In comments you indicate you're replacing spaces with underscores. Perhaps you are doing something like:

strProjectName = Replace(strProjectName," ", "_")

But if you're not also pushing that change to the Worksheet.Name property, you can expect these to happen:

  1. The file browse dialog appears
  2. The formula returns #REF error

The reason for both is that you are passing a reference to a worksheet that doesn't exist, which is why you get the #REF error. The file dialog is an attempt to let you correct that reference, by pointing to a file wherein that sheet name does exist. When you cancel out, the #REF error is expected.

So you need to do:

Worksheets(strProjectName).Name = Replace(strProjectName," ", "_")
strProjectName = Replace(strProjectName," ", "_")

Then, your formula should work.

How to send an email with Gmail as provider using Python?

Not directly related but still worth pointing out is that my package tries to make sending gmail messages really quick and painless. It also tries to maintain a list of errors and tries to point to the solution immediately.

It would literally only need this code to do exactly what you wrote:

import yagmail
yag = yagmail.SMTP('[email protected]')
yag.send('[email protected]', 'Why,Oh why!')

Or a one liner:

yagmail.SMTP('[email protected]').send('[email protected]', 'Why,Oh why!')

For the package/installation please look at git or pip, available for both Python 2 and 3.

Getting the parent of a directory in Bash

if for whatever reason you are interested in navigating up a specific number of directories you could also do: nth_path=$(cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && cd ../../../ && pwd). This would give 3 parents directories up

Linux configure/make, --prefix?

Do configure --help and see what other options are available.

It is very common to provide different options to override different locations. By standard, --prefix overrides all of them, so you need to override config location after specifying the prefix. This course of actions usually works for every automake-based project.

The worse case scenario is when you need to modify the configure script, or even worse, generated makefiles and config.h headers. But yeah, for Xfce you can try something like this:

./configure --prefix=/home/me/somefolder/mybuild/output/target --sysconfdir=/etc

I believe that should do it.

Open CSV file via VBA (performance)

This may help you, also it depends how your CSV file is formated.

  1. Open your excel sheet & go to menu Data > Import External Data > Import Data.
  2. Choose your CSV file.
  3. Original data type: choose Fixed width, then Next.
  4. It will autmaticall delimit your columns. then, you may check the splitted columns in Data preview panel.
  5. Then Finish & see.

Note: you may also go with Delimited as Original data type. In that case, you need to key-in your delimiting character.

HTH!

Oracle Trigger ORA-04098: trigger is invalid and failed re-validation

Cause: A trigger was attempted to be retrieved for execution and was found to be invalid. This also means that compilation/authorization failed for the trigger.

Action: Options are to resolve the compilation/authorization errors, disable the trigger, or drop the trigger.

Syntax

ALTER TRIGGER trigger Name DISABLE;

ALTER TRIGGER trigger_Name ENABLE;

convert datetime to date format dd/mm/yyyy

This works for me:

string dateTimeString = "21?-?10?-?2014? ?15?:?40?:?30";
dateTimeString = Regex.Replace(dateTimeString, @"[^\u0000-\u007F]", string.Empty);

string inputFormat = "dd-MM-yyyy HH:mm:ss";
string outputFormat = "yyyy-MM-dd HH:mm:ss";
var dateTime = DateTime.ParseExact(dateTimeString, inputFormat, CultureInfo.InvariantCulture);
string output = dateTime.ToString(outputFormat);

Console.WriteLine(output);

How to get Rails.logger printing to the console/stdout when running rspec?

For Rails 4.x the log level is configured a bit different than in Rails 3.x

Add this to config/environment/test.rb

# Enable stdout logger
config.logger = Logger.new(STDOUT)

# Set log level
config.log_level = :ERROR

The logger level is set on the logger instance from config.log_level at: https://github.com/rails/rails/blob/v4.2.4/railties/lib/rails/application/bootstrap.rb#L70

Environment variable

As a bonus, you can allow overwriting the log level using an environment variable with a default value like so:

# default :ERROR
config.log_level = ENV.fetch("LOG_LEVEL", "ERROR")

And then running tests from shell:

# Log level :INFO (the value is uppercased in bootstrap.rb)
$ LOG_LEVEL=info rake test

# Log level :ERROR
$ rake test

Git push/clone to new server
  1. git remote add name url
  2. git push name branch

Example:

git remote add origin [email protected]:foo/bar.git
git push origin master

See the docs for git push -- you can set a remote as the default remote for a given branch; if you don't, the name origin is special. Just git push alone will do the same as git push origin thisbranch (for whatever branch you're on).

How to declare a structure in a header that is to be used by multiple files in c?

if this structure is to be used by some other file func.c how to do it?

When a type is used in a file (i.e. func.c file), it must be visible. The very worst way to do it is copy paste it in each source file needed it.

The right way is putting it in an header file, and include this header file whenever needed.

shall we open a new header file and declare the structure there and include that header in the func.c?

This is the solution I like more, because it makes the code highly modular. I would code your struct as:

#ifndef SOME_HEADER_GUARD_WITH_UNIQUE_NAME
#define SOME_HEADER_GUARD_WITH_UNIQUE_NAME

struct a
{ 
    int i;
    struct b
    {
        int j;
    }
};

#endif

I would put functions using this structure in the same header (the function that are "semantically" part of its "interface").

And usually, I could name the file after the structure name, and use that name again to choose the header guards defines.

If you need to declare a function using a pointer to the struct, you won't need the full struct definition. A simple forward declaration like:

struct a ;

Will be enough, and it decreases coupling.

or can we define the total structure in header file and include that in both source.c and func.c?

This is another way, easier somewhat, but less modular: Some code needing only your structure to work would still have to include all types.

In C++, this could lead to interesting complication, but this is out of topic (no C++ tag), so I won't elaborate.

then how to declare that structure as extern in both the files. ?

I fail to see the point, perhaps, but Greg Hewgill has a very good answer in his post How to declare a structure in a header that is to be used by multiple files in c?.

shall we typedef it then how?

  • If you are using C++, don't.
  • If you are using C, you should.

The reason being that C struct managing can be a pain: You have to declare the struct keyword everywhere it is used:

struct MyStruct ; /* Forward declaration */

struct MyStruct
{
   /* etc. */
} ;

void doSomething(struct MyStruct * p) /* parameter */
{
   struct MyStruct a ; /* variable */
   /* etc */
}

While a typedef will enable you to write it without the struct keyword.

struct MyStructTag ; /* Forward declaration */

typedef struct MyStructTag
{
   /* etc. */
} MyStruct ;

void doSomething(MyStruct * p) /* parameter */
{
   MyStruct a ; /* variable */
   /* etc */
}

It is important you still keep a name for the struct. Writing:

typedef struct
{
   /* etc. */
} MyStruct ;

will just create an anonymous struct with a typedef-ed name, and you won't be able to forward-declare it. So keep to the following format:

typedef struct MyStructTag
{
   /* etc. */
} MyStruct ;

Thus, you'll be able to use MyStruct everywhere you want to avoid adding the struct keyword, and still use MyStructTag when a typedef won't work (i.e. forward declaration)

Edit:

Corrected wrong assumption about C99 struct declaration, as rightfully remarked by Jonathan Leffler.

Edit 2018-06-01:

Craig Barnes reminds us in his comment that you don't need to keep separate names for the struct "tag" name and its "typedef" name, like I did above for the sake of clarity.

Indeed, the code above could well be written as:

typedef struct MyStruct
{
   /* etc. */
} MyStruct ;

IIRC, this is actually what C++ does with its simpler struct declaration, behind the scenes, to keep it compatible with C:

// C++ explicit declaration by the user
struct MyStruct
{
   /* etc. */
} ;
// C++ standard then implicitly adds the following line
typedef MyStruct MyStruct;

Back to C, I've seen both usages (separate names and same names), and none has drawbacks I know of, so using the same name makes reading simpler if you don't use C separate "namespaces" for structs and other symbols.

Visual Studio move project to a different folder

It's easy in VS2012; just use the change mapping feature:

  1. Create the folder where you want the solution to be moved to.
  2. Check-in all your project files (if you want to keep you changes), or rollback any checked out files.
  3. Close the solution.
  4. Open the Source Control Explorer.
  5. Right-click the solution, and select "Advanced -> Remove Mapping..."
  6. Change the "Local Folder" value to the one you created in step #1.
  7. Select "Change".
  8. Open the solution by double-clicking it in the source control explorer.

Can't perform a React state update on an unmounted component

Inspired by @ford04 answer I use this hook, which also takes callbacks for success, errors, finally and an abortFn:

export const useAsync = (
        asyncFn, 
        onSuccess = false, 
        onError = false, 
        onFinally = false, 
        abortFn = false
    ) => {

    useEffect(() => {
        let isMounted = true;
        const run = async () => {
            try{
                let data = await asyncFn()
                if (isMounted && onSuccess) onSuccess(data)
            } catch(error) {
                if (isMounted && onError) onSuccess(error)
            } finally {
                if (isMounted && onFinally) onFinally()
            }
        }
        run()
        return () => {
            if(abortFn) abortFn()
            isMounted = false
        };
    }, [asyncFn, onSuccess])
}

If the asyncFn is doing some kind of fetch from back-end it often makes sense to abort it when the component is unmounted (not always though, sometimes if ie. you're loading some data into a store you might as well just want to finish it even if component is unmounted)

how to change text in Android TextView

@Zordid @Iambda answer is great, but I found that if I put 

mHandler.postDelayed(mUpdateUITimerTask, 10 * 1000);

in the run() method and 

mHandler.postDelayed(mUpdateUITimerTask, 0);

in the onCreate method make the thing keep updating.

How do you append an int to a string in C++?

If using Windows/MFC, and need the string for more than immediate output try:

int i = 4;
CString strOutput;
strOutput.Format("Player %d", i);

What is the difference between URL parameters and query strings?

The query component is indicated by the first ? in a URI. "Query string" might be a synonym (this term is not used in the URI standard).

Some examples for HTTP URIs with query components:

http://example.com/foo?bar
http://example.com/foo/foo/foo?bar/bar/bar
http://example.com/?bar
http://example.com/?@bar._=???/1:
http://example.com/?bar1=a&bar2=b

(list of allowed characters in the query component)

The "format" of the query component is up to the URI authors. A common convention (but nothing more than a convention, as far as the URI standard is concerned¹) is to use the query component for key-value pairs, aka. parameters, like in the last example above: bar1=a&bar2=b.

Such parameters could also appear in the other URI components, i.e., the path² and the fragment. As far as the URI standard is concerned, it’s up to you which component and which format to use.

Example URI with parameters in the path, the query, and the fragment:

http://example.com/foo;key1=value1?key2=value2#key3=value3

¹ The URI standard says about the query component:

[…] query components are often used to carry identifying information in the form of "key=value" pairs […]

² The URI standard says about the path component:

[…] the semicolon (";") and equals ("=") reserved characters are often used to delimit parameters and parameter values applicable to that segment. The comma (",") reserved character is often used for similar purposes.

What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?

You can easily use Node.JS in your web app only for real-time communication. Node.JS is really powerful when it's about WebSockets. Therefore "PHP Notifications via Node.js" would be a great concept.

See this example: Creating a Real-Time Chat App with PHP and Node.js

How to create a dynamic array of integers

 
int main()
{
  int size;

  std::cin >> size;

  int *array = new int[size];

  delete [] array;

  return 0;
}

Don't forget to delete every array you allocate with new.

Bulk Record Update with SQL

Or you can simply update without using join like this:

Update t1 set  t1.Description = t2.Description from @tbl2 t2,tbl1 t1
where t1.ID= t2.ID

ORA-03113: end-of-file on communication channel after long inactivity in ASP.Net app

Check that there isn't a firewall that is ending the connection after certain period of time (this was the cause of a similar problem we had)

What to do with commit made in a detached head

Create a branch where you are, then switch to master and merge it:

git branch my-temporary-work
git checkout master
git merge my-temporary-work

Expand a random range from 1–5 to 1–7

Why not do it simple?

int random7() {
  return random5() + (random5() % 3);
}

The chances of getting 1 and 7 in this solution is lower due to the modulo, however, if you just want a quick and readable solution, this is the way to go.

Proper way to initialize a C# dictionary with values?

I can't reproduce this issue in a simple .NET 4.0 console application:

static class Program
{
    static void Main(string[] args)
    {
        var myDict = new Dictionary<string, string>
        {
            { "key1", "value1" },
            { "key2", "value2" }
        };

        Console.ReadKey();
    }
}

Can you try to reproduce it in a simple Console application and go from there? It seems likely that you're targeting .NET 2.0 (which doesn't support it) or client profile framework, rather than a version of .NET that supports initialization syntax.

Convert Json String to C# Object List

 
public static class Helper
{
    public static string AsJsonList<T>(List<T> tt)
    {
        return new JavaScriptSerializer().Serialize(tt);
    }
    public static string AsJson<T>(T t)
    {
        return new JavaScriptSerializer().Serialize(t);
    }
    public static List<T> AsObjectList<T>(string tt)
    {
        return new JavaScriptSerializer().Deserialize<List<T>>(tt);
    }
    public static T AsObject<T>(string t)
    {
        return new JavaScriptSerializer().Deserialize<T>(t);
    }
}

How to output an Excel *.xls file from classic ASP

You must specify the file to be downloaded (attachment) by the client in the http header:

Response.ContentType = "application/vnd.ms-excel"
Response.AppendHeader "content-disposition", "attachment: filename=excelTest.xls"

http://classicasp.aspfaq.com/general/how-do-i-prompt-a-save-as-dialog-for-an-accepted-mime-type.html