Programs & Examples On #Padarn

Extracting Ajax return data in jQuery

You can use json like the following example.

PHP code:

echo json_encode($array);

$array is array data, and the jQuery code is:

$.get("period/education/ajaxschoollist.php?schoolid="+schoolid, function(responseTxt, statusTxt, xhr){
    var a = JSON.parse(responseTxt);
    $("#hideschoolid").val(a.schoolid);
    $("#section_id").val(a.section_id);
    $("#schoolname").val(a.schoolname);
    $("#country_id").val(a.country_id);
    $("#state_id").val(a.state_id);
}

PHP post_max_size overrides upload_max_filesize

upload_max_filesize is the limit of any single file. post_max_size is the limit of the entire body of the request, which could include multiple files.

Given post_max_size = 20M and upload_max_filesize = 6M you could upload up to 3 files of 6M each. If instead post_max_size = 6M and upload_max_filesize = 20M then you could only upload one 6M file before hitting post_max_size. It doesn't help to have upload_max_size > post_max_size.

It's not obvious how to recognize going over post_max_size. $_POST and $_FILES will be empty, but $_SERVER['CONTENT_LENGTH'] will be > 0. If the client just didn't upload any post variables or files, then $_SERVER['CONTENT_LENGTH'] will be 0.

Python convert decimal to hex

A version using iteration:

def toHex(decimal):
    hex_str = ''
    digits = "0123456789ABCDEF"
    if decimal == 0:
       return '0'

    while decimal != 0:
        hex_str += digits[decimal % 16]
        decimal = decimal // 16

    return hex_str[::-1] # reverse the string

numbers = [0, 16, 20, 45, 255, 456, 789, 1024]
print([toHex(x) for x in numbers])
print([hex(x) for x in numbers])

Change a Nullable column to NOT NULL with Default Value

If its SQL Server you can do it on the column properties within design view

Try this?:

ALTER TABLE dbo.TableName 
  ADD CONSTRAINT DF_TableName_ColumnName
    DEFAULT '01/01/2000' FOR ColumnName

A variable modified inside a while loop is not remembered

I use stderr to store within a loop, and read from it outside. Here var i is initially set and read inside the loop as 1.

# reading lines of content from 2 files concatenated
# inside loop: write value of var i to stderr (before iteration)
# outside: read var i from stderr, has last iterative value

f=/tmp/file1
g=/tmp/file2
i=1
cat $f $g | \
while read -r s;
do
  echo $s > /dev/null;  # some work
  echo $i > 2
  let i++
done;
read -r i < 2
echo $i

Or use the heredoc method to reduce the amount of code in a subshell. Note the iterative i value can be read outside the while loop.

i=1
while read -r s;
do
  echo $s > /dev/null
  let i++
done <<EOT
$(cat $f $g)
EOT
let i--
echo $i

Finding an element in an array in Java

You might want to consider using a Collection implementation instead of a flat array.

The Collection interface defines a contains(Object o) method, which returns true/false.

ArrayList implementation defines an indexOf(Object o), which gives an index, but that method is not on all collection implementations.

Both these methods require proper implementations of the equals() method, and you probably want a properly implemented hashCode() method just in case you are using a hash based Collection (e.g. HashSet).

@RequestParam vs @PathVariable

@RequestParam is use for query parameter(static values) like: http://localhost:8080/calculation/pow?base=2&ext=4

@PathVariable is use for dynamic values like : http://localhost:8080/calculation/sqrt/8

@RequestMapping(value="/pow", method=RequestMethod.GET)
public int pow(@RequestParam(value="base") int base1, @RequestParam(value="ext") int ext1){
    int pow = (int) Math.pow(base1, ext1);
    return pow;
}

@RequestMapping("/sqrt/{num}")
public double sqrt(@PathVariable(value="num") int num1){
    double sqrtnum=Math.sqrt(num1);
    return sqrtnum;
}

Initializing ArrayList with some predefined values

try this

new String[] {"One","Two","Three","Four"};

or

List<String> places = Arrays.asList("One", "Two", "Three");

ARRAYS

Appending to list in Python dictionary

Is there a more elegant way to write this code?

Use collections.defaultdict:

from collections import defaultdict

dates_dict = defaultdict(list)
for key, date in cur:
    dates_dict[key].append(date)

Visual Studio Code cannot detect installed git

I had this problem after upgrading to macOS Catalina.

The issue is resolved as follows:

  1. Find git location from the terminal:

whereis git 2. Add the location of git in settings file with your location:

settings.json

"git.path": "/usr/bin/git", Depending on your platform, the user settings file (settings.json) is located here:

Windows %APPDATA%\Code\User\settings.json

macOS $HOME/Library/Application Support/Code/User/settings.json

Linux $HOME/.config/Code/User/settings.json

Javascript replace all "%20" with a space

If you need to remove white spaces at the end then here is a solution: https://www.geeksforgeeks.org/urlify-given-string-replace-spaces/

_x000D_
_x000D_
const stringQ1 = (string)=>{_x000D_
  //remove white space at the end _x000D_
  const arrString = string.split("")_x000D_
  for(let i = arrString.length -1 ; i>=0 ; i--){_x000D_
    let char = arrString[i];_x000D_
    _x000D_
    if(char.indexOf(" ") >=0){_x000D_
     arrString.splice(i,1)_x000D_
    }else{_x000D_
      break;_x000D_
    }_x000D_
  }_x000D_
_x000D_
  let start =0;_x000D_
  let end = arrString.length -1;_x000D_
  _x000D_
_x000D_
  //add %20_x000D_
  while(start < end){_x000D_
    if(arrString[start].indexOf(' ') >=0){_x000D_
      arrString[start] ="%20"_x000D_
      _x000D_
    }_x000D_
    _x000D_
    start++;_x000D_
  }_x000D_
  _x000D_
  return arrString.join('');_x000D_
}_x000D_
_x000D_
console.log(stringQ1("Mr John Smith   "))
_x000D_
_x000D_
_x000D_

Plotting in a non-blocking way with Matplotlib

I figured out that the plt.pause(0.001) command is the only thing needed and nothing else.

plt.show() and plt.draw() are unnecessary and / or blocking in one way or the other. So here is a code that draws and updates a figure and keeps going. Essentially plt.pause(0.001) seems to be the closest equivalent to matlab's drawnow.

Unfortunately those plots will not be interactive (they freeze), except you insert an input() command, but then the code will stop.

The documentation of the plt.pause(interval) command states:

If there is an active figure, it will be updated and displayed before the pause...... This can be used for crude animation.

and this is pretty much exactly what we want. Try this code:

import numpy as np
from matplotlib import pyplot as plt

x = np.arange(0, 51)               # x coordinates  
         
for z in range(10, 50):

    y = np.power(x, z/10)          # y coordinates of plot for animation

    plt.cla()                      # delete previous plot
    plt.axis([-50, 50, 0, 10000])  # set axis limits, to avoid rescaling
    plt.plot(x, y)                 # generate new plot
    plt.pause(0.1)                 # pause 0.1 sec, to force a plot redraw

What is the use of a cursor in SQL Server?

Cursors are a mechanism to explicitly enumerate through the rows of a result set, rather than retrieving it as such.

However, while they may be more comfortable to use for programmers accustomed to writing While Not RS.EOF Do ..., they are typically a thing to be avoided within SQL Server stored procedures if at all possible -- if you can write a query without the use of cursors, you give the optimizer a much better chance to find a fast way to implement it.

In all honesty, I've never found a realistic use case for a cursor that couldn't be avoided, with the exception of a few administrative tasks such as looping over all indexes in the catalog and rebuilding them. I suppose they might have some uses in report generation or mail merges, but it's probably more efficient to do the cursor-like work in an application that talks to the database, letting the database engine do what it does best -- set manipulation.

Regular expression to get a string between two strings in Javascript

You can use destructuring to only focus on the part of your interest.

So you can do:

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_x000D_
let str = "My cow always gives milk";

let [, result] = str.match(/\bcow\s+(.*?)\s+milk\b/) || [];

console.log(result);
_x000D_
_x000D_
_x000D_

In this way you ignore the first part (the complete match) and only get the capture group's match. The addition of || [] may be interesting if you are not sure there will be a match at all. In that case match would return null which cannot be destructured, and so we return [] instead in that case, and then result will be null.

The additional \b ensures the surrounding words "cow" and "milk" are really separate words (e.g. not "milky"). Also \s+ is needed to avoid that the match includes some outer spacing.

Why would one omit the close tag?

Sending headers earlier than the normal course may have far reaching consequences. Below are just a few of them that happened to come to my mind at the moment:

  1. While current PHP releases may have output buffering on, the actual production servers you will be deploying your code on are far more important than any development or testing machines. And they do not always tend to follow latest PHP trends immediately.

  2. You may have headaches over inexplicable functionality loss. Say, you are implementing some kind payment gateway, and redirect user to a specific URL after successful confirmation by the payment processor. If some kind of PHP error, even a warning, or an excess line ending happens, the payment may remain unprocessed and the user may still seem unbilled. This is also one of the reasons why needless redirection is evil and if redirection is to be used, it must be used with caution.

  3. You may get "Page loading canceled" type of errors in Internet Explorer, even in the most recent versions. This is because an AJAX response/json include contains something that it shouldn't contain, because of the excess line endings in some PHP files, just as I've encountered a few days ago.

  4. If you have some file downloads in your app, they can break too, because of this. And you may not notice it, even after years, since the specific breaking habit of a download depends on the server, the browser, the type and content of the file (and possibly some other factors I don't want to bore you with).

  5. Finally, many PHP frameworks including Symfony, Zend and Laravel (there is no mention of this in the coding guidelines but it follows the suit) and the PSR-2 standard (item 2.2) require omission of the closing tag. PHP manual itself (1,2), Wordpress, Drupal and many other PHP software I guess, advise to do so. If you simply make a habit of following the standard (and setup PHP-CS-Fixer for your code) you can forget the issue. Otherwise you will always need to keep the issue in your mind.

Bonus: a few gotchas (actually currently one) related to these 2 characters:

  1. Even some well-known libraries may contain excess line endings after ?>. An example is Smarty, even the most recent versions of both 2.* and 3.* branch have this. So, as always, watch for third party code. Bonus in bonus: A regex for deleting needless PHP endings: replace (\s*\?>\s*)$ with empty text in all files that contain PHP code.

How to round each item in a list of floats to 2 decimal places?

If you really want an iterator-free solution, you can use numpy and its array round function.

import numpy as np
myList = list(np.around(np.array(myList),2))

n-grams in python, four, five, six grams?

A more elegant approach to build bigrams with python’s builtin zip(). Simply convert the original string into a list by split(), then pass the list once normally and once offset by one element.

string = "I really like python, it's pretty awesome."

def find_bigrams(s):
    input_list = s.split(" ")
    return zip(input_list, input_list[1:])

def find_ngrams(s, n):
  input_list = s.split(" ")
  return zip(*[input_list[i:] for i in range(n)])

find_bigrams(string)

[('I', 'really'), ('really', 'like'), ('like', 'python,'), ('python,', "it's"), ("it's", 'pretty'), ('pretty', 'awesome.')]

Passing the argument to CMAKE via command prompt

CMake 3.13 on Ubuntu 16.04

This approach is more flexible because it doesn't constraint MY_VARIABLE to a type:

$ cat CMakeLists.txt 
message("MY_VARIABLE=${MY_VARIABLE}")
if( MY_VARIABLE ) 
    message("MY_VARIABLE evaluates to True")
endif()

$ mkdir build && cd build

$ cmake ..
MY_VARIABLE=
-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/build

$ cmake .. -DMY_VARIABLE=True
MY_VARIABLE=True
MY_VARIABLE evaluates to True
-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/build

$ cmake .. -DMY_VARIABLE=False
MY_VARIABLE=False
-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/build

$ cmake .. -DMY_VARIABLE=1
MY_VARIABLE=1
MY_VARIABLE evaluates to True
-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/build

$ cmake .. -DMY_VARIABLE=0
MY_VARIABLE=0
-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/build

Perl - Multiple condition if statement without duplicating code?

Simple:

if ( $name eq 'tom' && $password eq '123!'
    || $name eq 'frank' && $password eq '321!'
) {

(use the high-precedence && and || in expressions, reserving and and or for flow control, to avoid common precedence errors)

Better:

my %password = (
    'tom' => '123!',
    'frank' => '321!',
);

if ( exists $password{$name} && $password eq $password{$name} ) {

Using column alias in WHERE clause of MySQL query produces an error

Standard SQL (or MySQL) does not permit the use of column aliases in a WHERE clause because

when the WHERE clause is evaluated, the column value may not yet have been determined.

(from MySQL documentation). What you can do is calculate the column value in the WHERE clause, save the value in a variable, and use it in the field list. For example you could do this:

SELECT `users`.`first_name`, `users`.`last_name`, `users`.`email`,
@postcode AS `guaranteed_postcode`
FROM `users` LEFT OUTER JOIN `locations`
ON `users`.`id` = `locations`.`user_id`
WHERE (@postcode := SUBSTRING(`locations`.`raw`,-6,4)) NOT IN
(
 SELECT `postcode` FROM `postcodes` WHERE `region` IN
 (
  'australia'
 )
)

This avoids repeating the expression when it grows complicated, making the code easier to maintain.

How to control border height?

I was just looking for this... By using David's answer, I used a span and gave it some padding (height won't work + top margin issue)... Works like a charm;

See fiddle

<ul>
  <li><a href="index.php">Home</a></li><span class="divider"></span>
  <li><a href="about.php">About Us</a></li><span class="divider"></span>
  <li><a href="#">Events</a></li><span class="divider"></span>
  <li><a href="#">Forum</a></li><span class="divider"></span>
  <li><a href="#">Contact</a></li>
</ul>

.divider {
    border-left: 1px solid #8e1537;
    padding: 29px 0 24px 0;
}

Change Bootstrap tooltip color

Here's a SCSS code (compiled css below) that will help you to easily control the tooltip colors, including the arrow (border and background for the arrow as well):

Note: you might need to add "important" in some places in order for the CSS rules to take effect. Note #2: the style here only works for TOP and BOTTOM tooltip layouts. Feel free to add some more styling (&.bs-tooltip-left, &.bs-tooltip-right, etc)

SCSS:

$tt-text-color: lime;
$tt-border-color: lime;
$tt-bg-color: black;
$arrow-border-color: lime;
$arrow-bg-color: black;

.tooltip {
  .tooltip-inner {
    background: $tt-bg-color;
    color: $tt-text-color;
    border: 2px solid $tt-border-color;
  }
  .arrow {
    width: 11px;
    height: 11px;
    border: 2px solid $arrow-border-color;
    bottom: 1px;
    &:before {
      width: 11px;
      height: 11px;
      background: $arrow-bg-color;
      border: 0;
    }
  }
  &.bs-tooltip-top {
    .arrow {
      transform: rotate(-135deg);
    }
  }
  &.bs-tooltip-bottom {
    .arrow {
      transform: rotate(135deg);
      top: 2px;
    }
  }
}

CSS:

.tooltip .tooltip-inner {
  background: black;
  color: lime;
  border: 2px solid lime;
}
.tooltip .arrow {
  width: 11px;
  height: 11px;
  border: 2px solid lime;
  bottom: 1px;
}
.tooltip .arrow:before {
  width: 11px;
  height: 11px;
  background: black;
  border: 0;
}
.tooltip.bs-tooltip-top .arrow {
  transform: rotate(-135deg);
}
.tooltip.bs-tooltip-bottom .arrow {
  transform: rotate(135deg);
  top: 2px;
}

Live Example:

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_x000D_
jQuery(document).ready(function(){_x000D_
 $('a').tooltip();_x000D_
});
_x000D_
.tooltip .tooltip-inner {_x000D_
  background: black;_x000D_
  color: lime;_x000D_
  border: 2px solid lime;_x000D_
}_x000D_
.tooltip .arrow {_x000D_
  width: 11px!important;_x000D_
  height: 11px!important;_x000D_
  border: 2px solid lime;_x000D_
  bottom: 1px;_x000D_
}_x000D_
.tooltip .arrow:before {_x000D_
  width: 11px;_x000D_
  height: 11px;_x000D_
  background: black;_x000D_
  border: 0;_x000D_
}_x000D_
.tooltip.bs-tooltip-top .arrow {_x000D_
  transform: rotate(-135deg);_x000D_
}_x000D_
.tooltip.bs-tooltip-bottom .arrow {_x000D_
  transform: rotate(135deg);_x000D_
  top: 2px;_x000D_
}
_x000D_
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet"/>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.4.1/js/bootstrap.bundle.min.js"></script>_x000D_
_x000D_
<div class="text-center py-4">_x000D_
<a class="cn-box big cn-copy" data-toggle="tooltip" data-placement="bottom" title="Hello There">_x000D_
  try me_x000D_
</a>_x000D_
</div>
_x000D_
_x000D_
_x000D_

QED symbol in latex

enter image description here

\documentclass{scrartcl}
\usepackage{amssymb}
\begin{document}
$\backslash$blacksquare: $\blacksquare$

$\backslash$square: $\square$
\end{document}

You can easily find such symbols with http://write-math.com

When you want to align it to the right, add \hfill.

I use:

\renewcommand{\qed}{\hfill\blacksquare}
\newcommand{\qedwhite}{\hfill \ensuremath{\Box}}

What's a .sh file?

What is a file with extension .sh?

It is a Bourne shell script. They are used in many variations of UNIX-like operating systems. They have no "language" and are interpreted by your shell (interpreter of terminal commands) or if the first line is in the form

#!/path/to/interpreter

they will use that particular interpreter. Your file has the first line:

#!/bin/bash

and that means that it uses Bourne Again Shell, so called bash. It is for all practical purposes a replacement for good old sh.

Depending upon the interpreter you will have different language in which the file is written.

Keep in mind, that in UNIX world, it is not the extension of the file that determines what the file is (see How to execute a shell script).

If you come from the world of DOS/Windows, you will be familiar with files that have .bat or .cmd extensions (batch files). They are not similar in content, but are akin in design.

How to execute a shell script

Unlike some silly operating systems, *nix does not rely exclusively on extensions to determine what to do with a file. Permissions are also used. This means that if you attempt to run the shell script after downloading it, it will be the same as trying to "run" any text file. The ".sh" extension is there only for your convenience to recognize that file.

You will need to make the file executable. Let's assume that you have downloaded your file as file.sh, you can then run in your terminal:

chmod +x file.sh

chmod is a command for changing file's permissions, +x sets execute permissions (in this case for everybody) and finally you have your file name.

You can also do it in GUI. Most of the time you can right click on the file and select properties, in XUbuntu the permissions options look like this:

File permissions in XUbuntu

If you do not wish to change the permissions. You can also force the shell to run the command. In the terminal you can run:

bash file.sh

The shell should be the same as in the first line of your script.

How safe is it?

You may find it weird that you must perform another task manually in order to execute a file. But this is partially because of strong need for security.

Basically when you download and run a bash script, it is the same thing as somebody telling you "run all these commands in sequence on your computer, I promise that the results will be good and safe". Ask yourself if you trust the party that has supplied this file, ask yourself if you are sure that have downloaded the file from the same place as you thought, maybe even have a glance inside to see if something looks out of place (although that requires that you know something about *nix commands and bash programming).

Unfortunately apart from the warning above I cannot give a step-by-step description of what you should do to prevent evil things from happening with your computer; so just keep in mind that any time you get and run an executable file from someone you're actually saying, "Sure, you can use my computer to do something".

Select rows having 2 columns equal value

Question 1 query:

SELECT ta.C1
      ,ta.C2
      ,ta.C3
      ,ta.C4
FROM [TableA] ta
WHERE (SELECT COUNT(*)
       FROM [TableA] ta2
       WHERE ta.C2=ta2.C2
       AND ta.C3=ta2.C3
       AND ta.C4=ta2.C4)>1

How to run the sftp command with a password from Bash script?

Another way would be to use lftp:

lftp sftp://user:password@host  -e "put local-file.name; bye"

The disadvantage of this method is that other users on the computer can read the password from tools like ps and that the password can become part of your shell history.

A more secure alternative which is available since LFTP 4.5.0 is setting the LFTP_PASSWORDenvironment variable and executing lftp with --env-password. Here's a full example:

LFTP_PASSWORD="just_an_example"
lftp --env-password sftp://user@host  -e "put local-file.name; bye"

LFTP also includes a cool mirroring feature (can include delete after confirmed transfer --Remove-source-files):

lftp -e 'mirror -R /local/log/path/ /remote/path/' --env-password -u user sftp.foo.com

What is the attribute property="og:title" inside meta tag?

og:title is one of the open graph meta tags. og:... properties define objects in a social graph. They are used for example by Facebook.

og:title stands for the title of your object as it should appear within the graph (see here for more http://ogp.me/ )

How do I pass named parameters with Invoke-Command?

I suspect its a new feature since this post was created - pass parameters to the script block using $Using:var. Then its a simple mater to pass parameters provided the script is already on the machine or in a known network location relative to the machine

Taking the main example it would be:

icm -cn $Env:ComputerName { 
    C:\Scripts\ArchiveEventLogs\ver5\ArchiveEventLogs.ps1 -one "uno" -two "dos" -Debug -Clear $Using:Clear
}

Update TensorFlow

(tensorflow)$ pip install --upgrade pip  # for Python 2.7
(tensorflow)$ pip3 install --upgrade pip # for Python 3.n

(tensorflow)$ pip install --upgrade tensorflow      # for Python 2.7
(tensorflow)$ pip3 install --upgrade tensorflow     # for Python 3.n
(tensorflow)$ pip install --upgrade tensorflow-gpu  # for Python 2.7 and GPU
(tensorflow)$ pip3 install --upgrade tensorflow-gpu # for Python 3.n and GPU

(tensorflow)$ pip install --upgrade tensorflow-gpu==1.4.1 # for a specific version

Details on install tensorflow.

How to pass an event object to a function in Javascript?

Although this is the accepted answer, toto_tico's answer below is better :)

Try making the onclick js use 'return' to ensure the desired return value gets used...

<button type="button" value="click me" onclick="return check_me();" />

How do I subscribe to all topics of a MQTT broker

Use the wildcard "#" but beware that at some point you will have to somehow understand the data passing through the bus!

pip install - locale.Error: unsupported locale setting

While you can set the locale exporting an env variable, you will have to do that every time you start a session. Setting a locale this way will solve the problem permanently:

sudo apt-get install locales
sudo locale-gen en_US.UTF-8
sudo echo "LANG=en_US.UTF-8" > /etc/default/locale

Converting user input string to regular expression

Use the RegExp object constructor to create a regular expression from a string:

var re = new RegExp("a|b", "i");
// same as
var re = /a|b/i;

Xcode 6 Storyboard the wrong size?

Go to Attributes Inspector(right top corner) In the Simulated Metrics, which has Size, Orientation, Status Bar, Top Bar, Bottom Bar properties. For SIZE, change Inferred --> Freeform.

regex to match a single character that is anything but a space

  • \s matches any white-space character
  • \S matches any non-white-space character
  • You can match a space character with just the space character;
  • [^ ] matches anything but a space character.

Pick whichever is most appropriate.

What is the difference between a framework and a library?

I think library is a set of utilities to reach a goal (for example, sockets, cryptography, etc). Framework is library + RUNTIME EINVIRONNEMENT. For example, ASP.NET is a framework: it accepts HTTP requests, create page object, invoke lyfe cicle events, etc. Framework does all this, you write a bit of code which will be run at a specific time of the life cycle of current request!

Anyway, very interestering question!

Using XPATH to search text containing &nbsp;

I cannot get a match using Xpather, but the following worked for me with plain XML and XSL files in Microsoft's XML Notepad:

<xsl:value-of select="count(//td[text()='&nbsp;'])" />

The value returned is 1, which is the correct value in my test case.

However, I did have to declare nbsp as an entity within my XML and XSL using the following:

<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#160;"> ]>

I'm not sure if that helps you, but I was able to actually find nbsp using an XPath expression.

Edit: My code sample actually contains the characters '&nbsp;' but the JavaScript syntax highlight converts it to the space character. Don't be mislead!

How to check the version of scipy

Using command line:

python -c "import scipy; print(scipy.__version__)"

What is the correct syntax of ng-include?

On ng-build, file not found(404) error occur. So we can use below code

<ng-include src="'views/transaction/test.html'"></ng-include>

insted of,

<div ng-include="'views/transaction/test.html'"></div>

Encode String to UTF-8

Use byte[] ptext = String.getBytes("UTF-8"); instead of getBytes(). getBytes() uses so-called "default encoding", which may not be UTF-8.

How to use adb pull command?

I don't think adb pull handles wildcards for multiple files. I ran into the same problem and did this by moving the files to a folder and then pulling the folder.

I found a link doing the same thing. Try following these steps.

How to copy selected files from Android with adb pull

How to create PDF files in Python

You can try this(Python-for-PDF-Generation) or you can try PyQt, which has support for printing to pdf.

Python for PDF Generation

The Portable Document Format (PDF) lets you create documents that look exactly the same on every platform. Sometimes a PDF document needs to be generated dynamically, however, and that can be quite a challenge. Fortunately, there are libraries that can help. This article examines one of those for Python.

Read more at http://www.devshed.com/c/a/Python/Python-for-PDF-Generation/#whoCFCPh3TAks368.99

Iterate over the lines of a string

Regex-based searching is sometimes faster than generator approach:

RRR = re.compile(r'(.*)\n')
def f4(arg):
    return (i.group(1) for i in RRR.finditer(arg))

How to dismiss notification after action has been clicked

I found that when you use the action buttons in expanded notifications, you have to write extra code and you are more constrained.

You have to manually cancel your notification when the user clicks an action button. The notification is only cancelled automatically for the default action.

Also if you start a broadcast receiver from the button, the notification drawer doesn't close.

I ended up creating a new NotificationActivity to address these issues. This intermediary activity without any UI cancels the notification and then starts the activity I really wanted to start from the notification.

I've posted sample code in a related post Clicking Android Notification Actions does not close Notification drawer.

What is the significance of #pragma marks? Why do we need #pragma marks?

#pragma mark is used to tag the group of methods so you may easily find and detect methods from the Jump Bar. It may help you when your code files reach about 1000 lines and you want to find methods quickly through the category from Jump box.

In a long program it becomes difficult to remember and find a method name. So pragma mark allows you to categorize methods according to the work they do. For example, you tagged some tag for Table View Protocol Methods, AlertView Methods, Init Methods, Declaration etc.

#pragma mark is the facility for XCode but it has no impact on your code. It merely helps to make it easier to find methods while coding.

While loop to test if a file exists in bash

do it like this

while true
do
  [ -f /tmp/list.txt ] && break
  sleep 2
done
ls -l /tmp/list.txt

MySQL Workbench not opening on Windows

Update 2020:

Unfortunately this is still happening:

  1. Download .NET 4.0 (My machine already had it.)
  2. Download Visual C++
  3. As the above solution states. Download the Mysql workbench installer.

I still don't know why, it would allow me to install without checking for dependencies. I have become accustomed to this kind of behavior when I am installing any application and to not see it is annoying. I suppose I should leave this personal opinions out of my solution but I have had to install this multiple times and have comes across some kind of dependency issue.

How to download Javadoc to read offline?

For any javadoc (not just the ones available for download) you can use the DownThemAll addon for Firefox with a suitable renaming mask, for example:

*subdirs*/*name*.*ext*

https://addons.mozilla.org/en-us/firefox/addon/downthemall/

https://www.downthemall.org/main/install-it/downthemall-3-0-7/

Edit: It's possible to use some older versions of the DownThemAll add-on with Pale Moon browser.

Run R script from command line

Just for documentation, sometimes you need to run the script as sudo:

sudo Rscript path/to/your/file.R

How to write a multiline command?

If you came here looking for an answer to this question but not exactly the way the OP meant, ie how do you get multi-line CMD to work in a single line, I have a sort of dangerous answer for you.

Trying to use this with things that actually use piping, like say findstr is quite problematic. The same goes for dealing with elses. But if you just want a multi-line conditional command to execute directly from CMD and not via a batch file, this should do work well.

Let's say you have something like this in a batch that you want to run directly in command prompt:

@echo off
for /r %%T IN (*.*) DO (
    if /i "%%~xT"==".sln" (
        echo "%%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file
        echo Dumping SLN file contents
        type "%%~T"
    )
)

Now, you could use the line-continuation carat (^) and manually type it out like this, but warning, it's tedious and if you mess up you can learn the joy of typing it all out again.

Well, it won't work with just ^ thanks to escaping mechanisms inside of parentheses shrug At least not as-written. You actually would need to double up the carats like so:

@echo off ^
More? for /r %T IN (*.sln) DO (^^
More? if /i "%~xT"==".sln" (^^
More? echo "%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file^^
More? echo Dumping SLN file contents^^
More? type "%~T"))

Instead, you can be a dirty sneaky scripter from the wrong side of the tracks that don't need no carats by swapping them out for a single pipe (|) per continuation of a loop/expression:

@echo off
for /r %T IN (*.sln) DO if /i "%~xT"==".sln" echo "%~T" is a normal SLN file, and not a .SLN.METAPROJ or .SLN.PROJ file | echo Dumping SLN file contents | type "%~T"

gradlew: Permission Denied

With this step set permission to gradlew

steps {
    echo 'Compile project'
    sh "chmod +x gradlew"
    sh "./gradlew clean build --no-daemon"
}

MongoDB: How to update multiple documents with a single command?

Multi update was added recently, so is only available in the development releases (1.1.3). From the shell you do a multi update by passing true as the fourth argument to update(), where the the third argument is the upsert argument:

db.test.update({foo: "bar"}, {$set: {test: "success!"}}, false, true);

For versions of mongodb 2.2+ you need to set option multi true to update multiple documents at once.

db.test.update({foo: "bar"}, {$set: {test: "success!"}}, {multi: true})

For versions of mongodb 3.2+ you can also use new method updateMany() to update multiple documents at once, without the need of separate multi option.

db.test.updateMany({foo: "bar"}, {$set: {test: "success!"}})

Validate email with a regex in jQuery

You probably want to use a regex like the one described here to check the format. When the form's submitted, run the following test on each field:

var userinput = $(this).val();
var pattern = /^\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b$/i

if(!pattern.test(userinput))
{
  alert('not a valid e-mail address');
}?

how to open *.sdf files?

If you simply need to view the table and run queries on it you can use this third party sdf viewer. It is a lightweight viewer that has all the basic functionalities and is ready to use after install.

and ofcourse, its Free.

Python constructor and default value

Mutable default arguments don't generally do what you want. Instead, try this:

class Node:
     def __init__(self, wordList=None, adjacencyList=None):
        if wordList is None:
            self.wordList = []
        else:
             self.wordList = wordList 
        if adjacencyList is None:
            self.adjacencyList = []
        else:
             self.adjacencyList = adjacencyList 

Vue.js - How to properly watch for nested data

You can use a deep watcher for that:

watch: {
  item: {
     handler(val){
       // do stuff
     },
     deep: true
  }
}

This will now detect any changes to the objects in the item array and additions to the array itself (when used with Vue.set). Here's a JSFiddle: http://jsfiddle.net/je2rw3rs/

EDIT

If you don't want to watch for every change on the top level object, and just want a less awkward syntax for watching nested objects directly, you can simply watch a computed instead:

var vm = new Vue({
  el: '#app',
  computed: {
    foo() {
      return this.item.foo;
    }
  },
  watch: {
    foo() {
      console.log('Foo Changed!');
    }
  },
  data: {
    item: {
      foo: 'foo'
    }
  }
})

Here's the JSFiddle: http://jsfiddle.net/oa07r5fw/

How to change background color in android app

You can try this in xml sheet:

android:background="@color/background_color"

slashes in url variables

You need to escape those but don't just replace it by %2F manually. You can use URLEncoder for this.

Eg URLEncoder.encode(url, "UTF-8")

Then you can say

yourUrl = "www.musicExplained/index.cfm/artist/" + URLEncoder.encode(VariableName, "UTF-8")

Reading a cell value in Excel vba and write in another Cell

surely you can do this with worksheet formulas, avoiding VBA entirely:

so for this value in say, column AV S:1 P:0 K:1 Q:1

you put this formula in column BC:

=MID(AV:AV,FIND("S",AV:AV)+2,1)

then these formulas in columns BD, BE...

=MID(AV:AV,FIND("P",AV:AV)+2,1)
=MID(AV:AV,FIND("K",AV:AV)+2,1)
=MID(AV:AV,FIND("Q",AV:AV)+2,1)

so these formulas look for the values S:1, P:1 etc in column AV. If the FIND function returns an error, then 0 is returned by the formula, else 1 (like an IF, THEN, ELSE

Then you would just copy down the formulas for all the rows in column AV.

HTH Philip

Python error: TypeError: 'module' object is not callable for HeadFirst Python code

Your module and your class AthleteList have the same name. The line

import AthleteList

imports the module and creates a name AthleteList in your current scope that points to the module object. If you want to access the actual class, use

AthleteList.AthleteList

In particular, in the line

return(AthleteList(templ.pop(0), templ.pop(0), templ))

you are actually accessing the module object and not the class. Try

return(AthleteList.AthleteList(templ.pop(0), templ.pop(0), templ))

ValueError: unconverted data remains: 02:05

Best answer is to use the from dateutil import parser.

usage:

from dateutil import parser
datetime_obj = parser.parse('2018-02-06T13:12:18.1278015Z')
print datetime_obj
# output: datetime.datetime(2018, 2, 6, 13, 12, 18, 127801, tzinfo=tzutc())

How does Google calculate my location on a desktop?

It is possible get your approximate locate based on your IP address (wireless or fixed).

See for example hostip.info or maxmind which basically provide a mapping from IP address to geographical coordinates. The probably use many kinds of heuristics and datasources. This kind of system has probably enough accuracy to put you in right major city, in most cases.

Google probably uses somewhat similar approach in addition to WiFi tricks.

IndexError: index 1 is out of bounds for axis 0 with size 1/ForwardEuler

The problem is with your line

x=np.array ([x0*n])

Here you define x as a single-item array of -200.0. You could do this:

x=np.array ([x0,]*n)

or this:

x=np.zeros((n,)) + x0

Note: your imports are quite confused. You import numpy modules three times in the header, and then later import pylab (that already contains all numpy modules). If you want to go easy, with one single

from pylab import *

line in the top you could use all the modules you need.

jQuery click function doesn't work after ajax call?

The click event doesn't exist at that point where the event is defined. You can use live or delegate the event.

$('.deletelanguage').live('click',function(){
    alert("success");
    $('#LangTable').append(' <br>------------<br> <a class="deletelanguage">Now my class is deletelanguage. click me to test it is not working.</a>');
});

Closing database connections in Java

Yes, you need to close Connection. Otherwise, the database client will typically keep the socket connection and other resources open.

ImportError: No module named _ssl

I had exactly the same problem. I fixed it without rebuilding python, as follows:

  1. Find another server with the same architecture (i386 or x86_64) and the same python version (example: 2.7.5). Yes, this is the hard part. You can try installing python from sources into another server if you can't find any server with the same python version.

  2. In this another server, check if import ssl works. It should work.

  3. If it works, then try to find the _ssl lilbrary as follows:

    [root@myserver]# find / -iname _ssl.so
    /usr/local/python27/lib/python2.7/lib-dynload/_ssl.so
    
  4. Copy this file into the original server. Use the same destination folder: /usr/local/python27/lib/python2.7/lib-dynload/

  5. Double check owner and permissions:

    [root@myserver]# chown root:root _ssl.so
    [root@myserver]# chmod 755 _ssl.so
    
  6. Now you should be able to import ssl.

This worked for me in a CentOS 6.3 x86_64 environment with python 2.7.3. Also I had python 2.6.6 installed, but with ssl working fine.

How to send password using sftp batch file

You need to use the command pscp and forcing it to pass through sftp protocol. pscp is automatically installed when you install PuttY, a software to connect to a linux server through ssh.

When you have your pscp command here is the command line:

pscp -sftp -pw <yourPassword> "<pathToYourFile(s)>" <username>@<serverIP>:<PathInTheServerFromTheHomeDirectory>

These parameters (-sftp and -pw) are only available with pscp and not scp. You can also add -r if you want to upload everything in a folder in a recursive way.

get basic SQL Server table structure information

Instead of using count(*) you can SELECT * and you will return all of the details that you want including data_type:

SELECT *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'Address'

MSDN Docs on INFORMATION_SCHEMA.COLUMNS

How can I detect Internet Explorer (IE) and Microsoft Edge using JavaScript?

I don't know why, but I'm not seeing "Edge" in the userAgent like everyone else is talking about, so I had to take another route that may help some people.

Instead of looking at the navigator.userAgent, I looked at navigator.appName to distinguish if it was IE<=10 or IE11 and Edge. IE11 and Edge use the appName of "Netscape", while every other iteration uses "Microsoft Internet Explorer".

After we determine that the browser is either IE11 or Edge, I then looked to navigator.appVersion. I noticed that in IE11 the string was rather long with a lot of information inside of it. I arbitrarily picked out the word "Trident", which is definitely not in the navigator.appVersion for Edge. Testing for this word allowed me to distinguish the two.

Below is a function that will return a numerical value of which Internet Explorer the user is on. If on Microsoft Edge it returns the number 12.

Good luck and I hope this helps!

function Check_Version(){
    var rv = -1; // Return value assumes failure.

    if (navigator.appName == 'Microsoft Internet Explorer'){

       var ua = navigator.userAgent,
           re  = new RegExp("MSIE ([0-9]{1,}[\\.0-9]{0,})");

       if (re.exec(ua) !== null){
         rv = parseFloat( RegExp.$1 );
       }
    }
    else if(navigator.appName == "Netscape"){                       
       /// in IE 11 the navigator.appVersion says 'trident'
       /// in Edge the navigator.appVersion does not say trident
       if(navigator.appVersion.indexOf('Trident') === -1) rv = 12;
       else rv = 11;
    }       

    return rv;          
}

Brew doctor says: "Warning: /usr/local/include isn't writable."

First you need to create the directory:

sudo mkdir /usr/local/include

Second:

sudo chown -R $(whoami) $(brew --prefix)/*

Just what is an IntPtr exactly?

What is a Pointer?

In all languages, a pointer is a type of variable that stores a memory address, and you can either ask them to tell you the address they are pointing at or the value at the address they are pointing at.

A pointer can be thought of as a sort-of book mark. Except, instead of being used to jump quickly to a page in a book, a pointer is used to keep track of or map blocks of memory.

Imagine your program's memory precisely like one big array of 65535 bytes.

Pointers point obediently

Pointers remember one memory address each, and therefore they each point to a single address in memory.

As a group, pointers remember and recall memory addresses, obeying your every command ad nauseum.

You are their king.

Pointers in C#

Specifically in C#, a pointer is an integer variable that stores a memory address between 0 and 65534.

Also specific to C#, pointers are of type int and therefore signed.

You can't use negatively numbered addresses though, neither can you access an address above 65534. Any attempt to do so will throw a System.AccessViolationException.

A pointer called MyPointer is declared like so:

int *MyPointer;

A pointer in C# is an int, but memory addresses in C# begin at 0 and extend as far as 65534.

Pointy things should be handled with extra special care

The word unsafe is intended to scare you, and for a very good reason: Pointers are pointy things, and pointy things e.g. swords, axes, pointers, etc. should be handled with extra special care.

Pointers give the programmer tight control of a system. Therefore mistakes made are likely to have more serious consequences.

In order to use pointers, unsafe code has to be enabled in your program's properties, and pointers have to be used exclusively in methods or blocks marked as unsafe.

Example of an unsafe block

unsafe
{
    // Place code carefully and responsibly here.

}

How to use Pointers

When variables or objects are declared or instantiated, they are stored in memory.

  • Declare a pointer by using the * symbol prefix.

int *MyPointer;

  • To get the address of a variable, you use the & symbol prefix.

MyPointer = &MyVariable;

Once an address is assigned to a pointer, the following applies:

  • Without * prefix to refer to the memory address being pointed to as an int.

MyPointer = &MyVariable; // Set MyPointer to point at MyVariable

  • With * prefix to get the value stored at the memory address being pointed to.

"MyPointer is pointing at " + *MyPointer;

Since a pointer is a variable that holds a memory address, this memory address can be stored in a pointer variable.

Example of pointers being used carefully and responsibly

    public unsafe void PointerTest()
    {
        int x = 100; // Create a variable named x

        int *MyPointer = &x; // Store the address of variable named x into the pointer named MyPointer

        textBox1.Text = ((int)MyPointer).ToString(); // Displays the memory address stored in pointer named MyPointer

        textBox2.Text = (*MyPointer).ToString(); // Displays the value of the variable named x via the pointer named MyPointer.

    }

Notice the type of the pointer is an int. This is because C# interprets memory addresses as integer numbers (int).

Why is it int instead of uint?

There is no good reason.

Why use pointers?

Pointers are a lot of fun. With so much of the computer being controlled by memory, pointers empower a programmer with more control of their program's memory.

Memory monitoring.

Use pointers to read blocks of memory and monitor how the values being pointed at change over time.

Change these values responsibly and keep track of how your changes affect your computer.

Differences between cookies and sessions?

Google JSESSIONID. This will explain how the Servlet API initially uses URL re-writing and then, if cookies are enabled, cookies to manage sessions.

HTTP is stateless so the client browser must send the id of its session to the server with each request. The server, through whatever means, uses this id to retrieve any data for that session making it available for the lifetime of the request.

HTML Table cellspacing or padding just top / bottom

CSS?

td {
  padding-top: 2px;
  padding-bottom: 2px;
}

How do I rename a file using VBScript?

I see only one reason your code to not work, missed quote after file name string:

VBScript:

FSO.GetFile("MyFile.txt[missed_quote_here]).Name = "Hello.txt"

How to map calculated properties with JPA and Hibernate

JPA doesn't offer any support for derived property so you'll have to use a provider specific extension. As you mentioned, @Formula is perfect for this when using Hibernate. You can use an SQL fragment:

@Formula("PRICE*1.155")
private float finalPrice;

Or even complex queries on other tables:

@Formula("(select min(o.creation_date) from Orders o where o.customer_id = id)")
private Date firstOrderDate;

Where id is the id of the current entity.

The following blog post is worth the read: Hibernate Derived Properties - Performance and Portability.

Without more details, I can't give a more precise answer but the above link should be helpful.

See also:

Mismatch Detected for 'RuntimeLibrary'

Issue can be solved by adding CRT of msvcrtd.lib in the linker library. Because cryptlib.lib used CRT version of debug.

PostgreSQL, checking date relative to "today"

This should give you the current date minus 1 year:

select now() - interval '1 year';

create table with sequence.nextval in oracle

In Oracle 12c, you can now specify the CURRVAL and NEXTVAL sequence pseudocolumns as default values for a column. Alternatively, you can use Identity columns; see:

E.g.,

CREATE SEQUENCE t1_seq;
CREATE TABLE t1 (
  id          NUMBER DEFAULT t1_seq.NEXTVAL,
  description VARCHAR2(30)
);

Where can I find the assembly System.Web.Extensions dll?

The assembly was introduced with .NET 3.5 and is in the GAC.

Simply add a .NET reference to your project.

Project -> Right Click References -> Select .NET tab -> System.Web.Extensions

If it is not there, you need to install .NET 3.5 or 4.0.

How to get second-highest salary employees in a table

i have a table like this in this below image,and i am going to find the 2nd largest number in "to_user" column.. enter image description here

Here is Answer

select MAX(to_user) FROM db.masterledger where to_user NOT IN (SELECT MAX(to_user) FROM db.masterledger);

UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only

The answer of Shyam was right. I already faced with this issue before. It's not a problem, it's a SPRING feature. "Transaction rolled back because it has been marked as rollback-only" is acceptable.

Conclusion

  • USE REQUIRES_NEW if you want to commit what did you do before exception (Local commit)
  • USE REQUIRED if you want to commit only when all processes are done (Global commit) And you just need to ignore "Transaction rolled back because it has been marked as rollback-only" exception. But you need to try-catch out side the caller processNextRegistrationMessage() to have a meaning log.

Let's me explain more detail:

Question: How many Transaction we have? Answer: Only one

Because you config the PROPAGATION is PROPAGATION_REQUIRED so that the @Transaction persist() is using the same transaction with the caller-processNextRegistrationMessage(). Actually, when we get an exception, the Spring will set rollBackOnly for the TransactionManager so the Spring will rollback just only one Transaction.

Question: But we have a try-catch outside (), why does it happen this exception? Answer Because of unique Transaction

  1. When persist() method has an exception
  2. Go to the catch outside

    Spring will set the rollBackOnly to true -> it determine we must 
    rollback the caller (processNextRegistrationMessage) also.
    
  3. The persist() will rollback itself first.

  4. Throw an UnexpectedRollbackException to inform that, we need to rollback the caller also.
  5. The try-catch in run() will catch UnexpectedRollbackException and print the stack trace

Question: Why we change PROPAGATION to REQUIRES_NEW, it works?

Answer: Because now the processNextRegistrationMessage() and persist() are in the different transaction so that they only rollback their transaction.

Thanks

WinForms DataGridView font size

The straight forward approach:

this.dataGridView1.DefaultCellStyle.Font = new Font("Tahoma", 15);

Using a PagedList with a ViewModel ASP.Net MVC

I modified the code as follow:

ViewModel

using System.Collections.Generic;
using ContosoUniversity.Models;

namespace ContosoUniversity.ViewModels
{
    public class InstructorIndexData
    {
     public PagedList.IPagedList<Instructor> Instructors { get; set; }
     public PagedList.IPagedList<Course> Courses { get; set; }
     public PagedList.IPagedList<Enrollment> Enrollments { get; set; }
    }
}

Controller

public ActionResult Index(int? id, int? courseID,int? InstructorPage,int? CoursePage,int? EnrollmentPage)
{
 int instructPageNumber = (InstructorPage?? 1);
 int CoursePageNumber = (CoursePage?? 1);
 int EnrollmentPageNumber = (EnrollmentPage?? 1);
 var viewModel = new InstructorIndexData();
 viewModel.Instructors = db.Instructors
    .Include(i => i.OfficeAssignment)
    .Include(i => i.Courses.Select(c => c.Department))
    .OrderBy(i => i.LastName).ToPagedList(instructPageNumber,5);

 if (id != null)
 {
    ViewBag.InstructorID = id.Value;
    viewModel.Courses = viewModel.Instructors.Where(
        i => i.ID == id.Value).Single().Courses.ToPagedList(CoursePageNumber,5);
 }

 if (courseID != null)
 {
    ViewBag.CourseID = courseID.Value;
    viewModel.Enrollments = viewModel.Courses.Where(
        x => x.CourseID == courseID).Single().Enrollments.ToPagedList(EnrollmentPageNumber,5);
 }

 return View(viewModel);
}

View

<div>
   Page @(Model.Instructors.PageCount < Model.Instructors.PageNumber ? 0 : Model.Instructors.PageNumber) of @Model.Instructors.PageCount

   @Html.PagedListPager(Model.Instructors, page => Url.Action("Index", new {InstructorPage=page}))

</div>

I hope this would help you!!

While loop in batch

set /a countfiles-=%countfiles%

This will set countfiles to 0. I think you want to decrease it by 1, so use this instead:

set /a countfiles-=1

I'm not sure if the for loop will work, better try something like this:

:loop
cscript /nologo c:\deletefile.vbs %BACKUPDIR%
set /a countfiles-=1
if %countfiles% GTR 21 goto loop

Flask raises TemplateNotFound error even though template file exists

I had the same error turns out the only thing i did wrong was to name my 'templates' folder,'template' without 's'. After changing that it worked fine,dont know why its a thing but it is.

How to SUM two fields within an SQL query

ID  VALUE1  VALUE2
===================
1   1       2

1   2       2
2   3       4
2   4       5

select ID, (coalesce(VALUE1 ,0) + coalesce(VALUE2 ,0) as Total from TableName

Round double value to 2 decimal places

Use NSNumber *aNumber = [NSNumber numberWithDouble:number]; instead of NSNumber *aNumber = [NSNumber numberWithFloat:number];

+(NSString *)roundToNearestValue:(double)number
{
    NSNumber *aNumber = [NSNumber numberWithDouble:number];

    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
    [numberFormatter setUsesGroupingSeparator:NO];
    [numberFormatter setMaximumFractionDigits:2];
    [numberFormatter setMinimumFractionDigits:0];
    NSString *string = [numberFormatter stringFromNumber:aNumber];        
    return string;
}

Visual Studio Code includePath

For Mac users who only have Command Line Tools instead of Xcode, check the /Library/Developer/CommandLineTools directory, for example::

"configurations": [{
    "name": "Mac",
    "includePath": [
            "/usr/local/include",
            // others, e.g.: "/usr/local/opt/ncurses/include",
            "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include",
            "${workspaceFolder}/**"
    ]
}]

You probably need to adjust the path if you have different version of Command Line Tools installed.

Note: You can also open/generate the c_cpp_properties.json file via the C/Cpp: Edit Configurations command from the Command Palette (??P).

Two dimensional array in python

We can create multidimensional array dynamically as follows,

Create 2 variables to read x and y from standard input:

 print("Enter the value of x: ")
 x=int(input())

 print("Enter the value of y: ")
 y=int(input())

Create an array of list with initial values filled with 0 or anything using the following code

z=[[0 for row in range(0,x)] for col in range(0,y)]

creates number of rows and columns for your array data.

Read data from standard input:

for i in range(x):
         for j in range(y):
             z[i][j]=input()

Display the Result:

for i in range(x):
         for j in range(y):
             print(z[i][j],end=' ')
         print("\n")

or use another way to display above dynamically created array is,

for row in z:
     print(row)

Keras, How to get the output of each layer?

Based on all the good answers of this thread, I wrote a library to fetch the output of each layer. It abstracts all the complexity and has been designed to be as user-friendly as possible:

https://github.com/philipperemy/keract

It handles almost all the edge cases

Hope it helps!

How do I redirect to the previous action in ASP.NET MVC?

You could return to the previous page by using ViewBag.ReturnUrl property.

Increase permgen space

You can also increase it via the VM arguments in your IDE. In my case, I am using Tomcat v7.0 which is running on Eclipse. To do this, double click on your server (Tomcat v7.0). Click the 'Open launch configuration' link. Go to the 'Arguments' tab. Add -XX:MaxPermSize=512m to the VM arguments list. Click 'Apply' and then 'OK'. Restart your server.

Extending the User model with custom fields in Django

It's too late, but my answer is for those who search for a solution with a recent version of Django.

models.py:

from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver


class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    extra_Field_1 = models.CharField(max_length=25, blank=True)
    extra_Field_2 = models.CharField(max_length=25, blank=True)


@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()

you can use it in templates like this:

<h2>{{ user.get_full_name }}</h2>
<ul>
  <li>Username: {{ user.username }}</li>
  <li>Location: {{ user.profile.extra_Field_1 }}</li>
  <li>Birth Date: {{ user.profile.extra_Field_2 }}</li>
</ul>

and in views.py like this:

def update_profile(request, user_id):
    user = User.objects.get(pk=user_id)
    user.profile.extra_Field_1 = 'Lorem ipsum dolor sit amet, consectetur adipisicing elit...'
    user.save()

Changing SVG image color with javascript

This is for <object> SVG and className is .svgClass

<object class="svgClass" type="image/svg+xml" data="image.svg"></object>

So JavaScript code is like this:

// change to red
    document.querySelector(".svgClass").getSVGDocument().getElementById("svgInternalID").setAttribute("fill", "red")

To change svgInternalID you have to open SVG file which is plain .txt (ie image.svg) and edit it

<path id="svgInternalID"

AngularJS access scope from outside js function

I'm newbie, so sorry if is a bad practice. Based on the chosen answer, I did this function:

function x_apply(selector, variable, value) {
    var scope = angular.element( $(selector) ).scope();
    scope.$apply(function(){
        scope[variable] = value;
    });
}

I'm using it this way:

x_apply('#fileuploader', 'thereisfiles', true);

By the way, sorry for my english

Remove all of x axis labels in ggplot

You have to set to element_blank() in theme() elements you need to remove

ggplot(data = diamonds, mapping = aes(x = clarity)) + geom_bar(aes(fill = cut))+
  theme(axis.title.x=element_blank(),
        axis.text.x=element_blank(),
        axis.ticks.x=element_blank())

Using CSS to align a button bottom of the screen using relative positions

<button style="position: absolute; left: 20%; right: 20%; bottom: 5%;"> Button </button>

How to replace string in Groovy

You need to escape the backslash \:

println yourString.replace("\\", "/")

How is __eq__ handled in Python and in what order?

When Python2.x sees a == b, it tries the following.

  • If type(b) is a new-style class, and type(b) is a subclass of type(a), and type(b) has overridden __eq__, then the result is b.__eq__(a).
  • If type(a) has overridden __eq__ (that is, type(a).__eq__ isn't object.__eq__), then the result is a.__eq__(b).
  • If type(b) has overridden __eq__, then the result is b.__eq__(a).
  • If none of the above are the case, Python repeats the process looking for __cmp__. If it exists, the objects are equal iff it returns zero.
  • As a final fallback, Python calls object.__eq__(a, b), which is True iff a and b are the same object.

If any of the special methods return NotImplemented, Python acts as though the method didn't exist.

Note that last step carefully: if neither a nor b overloads ==, then a == b is the same as a is b.


From https://eev.ee/blog/2012/03/24/python-faq-equality/

Android Material: Status bar color won't change

Switch to AppCompatActivity and add a 25 dp paddingTop on the toolbar and turn on

<item name="android:windowTranslucentStatus">true</item>

Then, the will toolbar go up top the top

Java Timer vs ExecutorService?

If it's available to you, then it's difficult to think of a reason not to use the Java 5 executor framework. Calling:

ScheduledExecutorService ex = Executors.newSingleThreadScheduledExecutor();

will give you a ScheduledExecutorService with similar functionality to Timer (i.e. it will be single-threaded) but whose access may be slightly more scalable (under the hood, it uses concurrent structures rather than complete synchronization as with the Timer class). Using a ScheduledExecutorService also gives you advantages such as:

  • You can customize it if need be (see the newScheduledThreadPoolExecutor() or the ScheduledThreadPoolExecutor class)
  • The 'one off' executions can return results

About the only reasons for sticking to Timer I can think of are:

  • It is available pre Java 5
  • A similar class is provided in J2ME, which could make porting your application easier (but it wouldn't be terribly difficult to add a common layer of abstraction in this case)

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

For some reason, you're re-instantiating the form after you check is_valid(). Forms only get a cleaned_data attribute when is_valid() has been called, and you haven't called it on this new, second instance.

Just get rid of the second form = SearchForm(request.POST) and all should be well.

How do I update a Linq to SQL dbml file?

I would recommend using the visual designer built into VS2008, as updating the dbml also updates the code that is generated for you. Modifying the dbml outside of the visual designer would result in the underlying code being out of sync.

self.tableView.reloadData() not working in Swift

You must reload your TableView in main thread only. Otherwise your app will be crashed or will be updated after some time. For every UI update it is recommended to use main thread.

//To update UI only this below code is enough
//If you want to do changes in UI use this
DispatchQueue.main.async(execute: {
    //Update UI
    self.tableView.reloadData()//Your tableView here
})

//Perform some task and update UI immediately.
DispatchQueue.global(qos: .userInitiated).async {  
    // Call your function here
    DispatchQueue.main.async {  
        // Update UI
        self.tableView.reloadData()  
    }
}

//To call or execute function after some time and update UI
DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
    //Here call your function
    //If you want to do changes in UI use this
    DispatchQueue.main.async(execute: {
        //Update UI
        self.tableView.reloadData()
    })
}

How can I make the Android emulator show the soft keyboard?

If you're using AVD manager add a hardware property Keyboard support and set it to false.

That should disable the shown keyboard, and show the virtual one.

Jenkins returned status code 128 with github

In my case I had to add the public key to my repo (at Bitbucket) AND use git clone once via ssh to answer yes to the "known host" question the first time.

How can I get a resource content from a static context?

I am using API level 27 and found a best solution after struggling for around two days. If you want to read a xml file from a class which doesn't derive from Activity or Application then do the following.

  1. Put the testdata.xml file inside the assets directory.

  2. Write the following code to get the testdata document parsed.

        InputStream inputStream = this.getClass().getResourceAsStream("/assets/testdata.xml");
    
        // create a new DocumentBuilderFactory
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // use the factory to create a documentbuilder
        DocumentBuilder builder = factory.newDocumentBuilder();
        // create a new document from input stream
        Document doc = builder.parse(inputStream);
    

HTML+CSS: How to force div contents to stay in one line?

I jumped here looking for the very same thing, but none worked for me.

There are instances where regardless what you do, and depending on the system (Oracle Designer: Oracle 11g - PL/SQL), divs will always go to the next line, in which case you should use the span tag instead.

This worked wonders for me.

<span float: left; white-space: nowrap; overflow: hidden; onmouseover="rollOverImageSectionFiveThreeOne(this)">
    <input type="radio" id="radio4" name="p_verify_type" value="SomeValue"  />
</span> 
Just Your Text || 
<span id="headerFiveThreeOneHelpText" float: left; white-space: nowrap; overflow: hidden;></span>

How to create own dynamic type or dynamic object in C#?

dynamic myDynamic = new { PropertyOne = true, PropertyTwo = false};

Regular expression to match a line that doesn't contain a word

With negative lookahead, regular expression can match something not contains specific pattern. This is answered and explained by Bart Kiers. Great explanation!

However, with Bart Kiers' answer, the lookahead part will test 1 to 4 characters ahead while matching any single character. We can avoid this and let the lookahead part check out the whole text, ensure there is no 'hede', and then the normal part (.*) can eat the whole text all at one time.

Here is the improved regex:

/^(?!.*?hede).*$/

Note the (*?) lazy quantifier in the negative lookahead part is optional, you can use (*) greedy quantifier instead, depending on your data: if 'hede' does present and in the beginning half of the text, the lazy quantifier can be faster; otherwise, the greedy quantifier be faster. However if 'hede' does not present, both would be equal slow.

Here is the demo code.

For more information about lookahead, please check out the great article: Mastering Lookahead and Lookbehind.

Also, please check out RegexGen.js, a JavaScript Regular Expression Generator that helps to construct complex regular expressions. With RegexGen.js, you can construct the regex in a more readable way:

var _ = regexGen;

var regex = _(
    _.startOfLine(),             
    _.anything().notContains(       // match anything that not contains:
        _.anything().lazy(), 'hede' //   zero or more chars that followed by 'hede',
                                    //   i.e., anything contains 'hede'
    ), 
    _.endOfLine()
);

Using AJAX to pass variable to PHP and retrieve those using AJAX again

you have to pass values with the single quotes

$(document).ready(function() {    
    $("#raaagh").click(function(){    
        $.ajax({
            url: 'ajax.php', //This is the current doc
            type: "POST",
            data: ({name: '145'}), //variables should be pass like this
            success: function(data){
                console.log(data);
                           }
        });  
        $.ajax({
    url:'ajax.php',
    data:"",
    dataType:'json',
    success:function(data1){
            var y1=data1;
            console.log(data1);
            }
        });

    });
});

try it it may work.......

java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed

Bump...

I just had the same error. I noticed that I was invoking super.doPost(request, response); when overriding the doPost() method as well as explicitly invoking the superclass constructor

    public ScheduleServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

As soon as I commented out the super.doPost(request, response); from within doPost() statement it worked perfectly...

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //super.doPost(request, response);
        // More code here...

}

Needless to say, I need to re-read on super() best practices :p

C++ STL Vectors: Get iterator from index?

Try this:

vector<Type>::iterator nth = v.begin() + index;

After submitting a POST form open a new window showing the result

Add

<form target="_blank" ...></form>

or

form.setAttribute("target", "_blank");

to your form's definition.

How to export plots from matplotlib with transparent background?

Use the matplotlib savefig function with the keyword argument transparent=True to save the image as a png file.

In [30]: x = np.linspace(0,6,31)

In [31]: y = np.exp(-0.5*x) * np.sin(x)

In [32]: plot(x, y, 'bo-')
Out[32]: [<matplotlib.lines.Line2D at 0x3f29750>]            

In [33]: savefig('demo.png', transparent=True)

Result: demo.png

Of course, that plot doesn't demonstrate the transparency. Here's a screenshot of the PNG file displayed using the ImageMagick display command. The checkerboard pattern is the background that is visible through the transparent parts of the PNG file.

display screenshot

LogisticRegression: Unknown label type: 'continuous' using sklearn in python

I struggled with the same issue when trying to feed floats to the classifiers. I wanted to keep floats and not integers for accuracy. Try using regressor algorithms. For example:

import numpy as np
from sklearn import linear_model
from sklearn import svm

classifiers = [
    svm.SVR(),
    linear_model.SGDRegressor(),
    linear_model.BayesianRidge(),
    linear_model.LassoLars(),
    linear_model.ARDRegression(),
    linear_model.PassiveAggressiveRegressor(),
    linear_model.TheilSenRegressor(),
    linear_model.LinearRegression()]

trainingData    = np.array([ [2.3, 4.3, 2.5],  [1.3, 5.2, 5.2],  [3.3, 2.9, 0.8],  [3.1, 4.3, 4.0]  ])
trainingScores  = np.array( [3.4, 7.5, 4.5, 1.6] )
predictionData  = np.array([ [2.5, 2.4, 2.7],  [2.7, 3.2, 1.2] ])

for item in classifiers:
    print(item)
    clf = item
    clf.fit(trainingData, trainingScores)
    print(clf.predict(predictionData),'\n')

Is it possible to put CSS @media rules inline?

Problem

No, Media Queries cannot be used in this way

<span style="@media (...) { ... }"></span>

Solution

But if you want provided a specific behavior usable on the fly AND responsive, you can use the style markup and not the attribute.

e.i.

<style scoped>
.on-the-fly-behavior {
    background-image: url('particular_ad.png'); 
}
@media (max-width: 300px) {
    .on-the-fly-behavior {
        background-image: url('particular_ad_small.png');
    }
}
</style>
<span class="on-the-fly-behavior"></span>

See the code working in live on CodePen

In my Blog for example, I inject a <style> markup in <head> just after <link> declaration for CSS and it's contain the content of a textarea provided beside of real content textarea for create extra-class on the fly when I wrote an artitle.

Note : the scoped attribute is a part of HTML5 specification. If you do not use it, the validator will blame you but browsers currently not support the real purpose : scoped the content of <style> only on immediatly parent element and that element's child elements. Scoped is not mandatory if the <style> element is in <head> markup.


UPDATE: I advice to always use rules in the mobile first way so previous code should be:

<style scoped>
/* 0 to 299 */
.on-the-fly-behavior {
    background-image: url('particular_ad_small.png'); 
}
/* 300 to X */
@media (min-width: 300px) { /* or 301 if you want really the same as previously.  */
    .on-the-fly-behavior {   
        background-image: url('particular_ad.png');
    }
}
</style>
<span class="on-the-fly-behavior"></span>

Http Basic Authentication in Java using HttpClient?

Thanks for all answers above, but for me, I can not find Base64Encoder class, so I sort out my way anyway.

public static void main(String[] args) {
    try {
        DefaultHttpClient Client = new DefaultHttpClient();

        HttpGet httpGet = new HttpGet("https://httpbin.org/basic-auth/user/passwd");
        String encoding = DatatypeConverter.printBase64Binary("user:passwd".getBytes("UTF-8"));
        httpGet.setHeader("Authorization", "Basic " + encoding);

        HttpResponse response = Client.execute(httpGet);

        System.out.println("response = " + response);

        BufferedReader breader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        StringBuilder responseString = new StringBuilder();
        String line = "";
        while ((line = breader.readLine()) != null) {
            responseString.append(line);
        }
        breader.close();
        String repsonseStr = responseString.toString();

        System.out.println("repsonseStr = " + repsonseStr);

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

}

One more thing, I also tried

Base64.encodeBase64String("user:passwd".getBytes());

It does NOT work due to it return a string almost same with

DatatypeConverter.printBase64Binary()

but end with "\r\n", then server will return "bad request".

Also following code is working as well, actually I sort out this first, but for some reason, it does NOT work in some cloud environment (sae.sina.com.cn if you want to know, it is a chinese cloud service). so have to use the http header instead of HttpClient credentials.

public static void main(String[] args) {
    try {
        DefaultHttpClient Client = new DefaultHttpClient();
        Client.getCredentialsProvider().setCredentials(
                AuthScope.ANY,
                new UsernamePasswordCredentials("user", "passwd")
        );

        HttpGet httpGet = new HttpGet("https://httpbin.org/basic-auth/user/passwd");
        HttpResponse response = Client.execute(httpGet);

        System.out.println("response = " + response);

        BufferedReader breader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        StringBuilder responseString = new StringBuilder();
        String line = "";
        while ((line = breader.readLine()) != null) {
            responseString.append(line);
        }
        breader.close();
        String responseStr = responseString.toString();
        System.out.println("responseStr = " + responseStr);

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

How can I combine multiple nested Substitute functions in Excel?

Thanks for the idea of breaking down a formula Werner!

Using Alt+Enter allows one to put each bit of a complex substitute formula on separate lines: they become easier to follow and automatically line themselves up when Enter is pressed.

Just make sure you have enough end statements to match the number of substitute( lines either side of the cell reference.

As in this example:

=
substitute(
substitute(
substitute(
substitute(
B11
,"(","")
,")","")
,"[","")
,"]","")

becomes:

=
SUBSTITUTE(
SUBSTITUTE(
SUBSTITUTE(
SUBSTITUTE(B12,"(",""),")",""),"[",""),"]","")

which works fine as is, but one can always delete the extra paragraphs manually:

=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(B12,"(",""),")",""),"[",""),"]","")

Name > substitute()

[American Samoa] > American Samoa

Spark - load CSV file as DataFrame?

With Spark 2.4+, if you want to load a csv from a local directory, then you can use 2 sessions and load that into hive. The first session should be created with master() config as "local[*]" and the second session with "yarn" and Hive enabled.

The below one worked for me.

import org.apache.log4j.{Level, Logger}
import org.apache.spark._
import org.apache.spark.rdd._
import org.apache.spark.sql._

object testCSV { 

  def main(args: Array[String]) {
    Logger.getLogger("org").setLevel(Level.ERROR)
    val spark_local = SparkSession.builder().appName("CSV local files reader").master("local[*]").getOrCreate()

    import spark_local.implicits._
    spark_local.sql("SET").show(100,false)
    val local_path="/tmp/data/spend_diversity.csv"  // Local file
    val df_local = spark_local.read.format("csv").option("inferSchema","true").load("file://"+local_path) // "file://" is mandatory
    df_local.show(false)

    val spark = SparkSession.builder().appName("CSV HDFS").config("spark.sql.warehouse.dir", "/apps/hive/warehouse").enableHiveSupport().getOrCreate()

    import spark.implicits._
    spark.sql("SET").show(100,false)
    val df = df_local
    df.createOrReplaceTempView("lcsv")
    spark.sql(" drop table if exists work.local_csv ")
    spark.sql(" create table work.local_csv as select * from lcsv ")

   }

When ran with spark2-submit --master "yarn" --conf spark.ui.enabled=false testCSV.jar it went fine and created the table in hive.

Get last 3 characters of string

The easiest way would be using Substring

string str = "AM0122200204";
string substr = str.Substring(str.Length - 3);

Using the overload with one int as I put would get the substring of a string, starting from the index int. In your case being str.Length - 3, since you want to get the last three chars.

Heroku + node.js error (Web process failed to bind to $PORT within 60 seconds of launch)

In my case I had two issues...

1) no listener at all because of running app from another entry file and this run script was deleted from package.json "scripts"

enter image description here

2) Case sensitive problem with 'Sequelize' instead of 'sequelize'

enter image description here

Run PowerShell command from command prompt (no ps1 script)

Maybe powershell -Command "Get-AppLockerFileInformation....."

Take a look at powershell /?

"Char cannot be dereferenced" error

If Character.isLetter(ch) looks a bit wordy/ugly you can use a static import.

import static java.lang.Character.*;


if(isLetter(ch)) {

} else if(isDigit(ch)) {

} 

What is the Record type in typescript?

  1. Can someone give a simple definition of what Record is?

A Record<K, T> is an object type whose property keys are K and whose property values are T. That is, keyof Record<K, T> is equivalent to K, and Record<K, T>[K] is (basically) equivalent to T.

  1. Is Record<K,T> merely a way of saying "all properties on this object will have type T"? Probably not all objects, since K has some purpose...

As you note, K has a purpose... to limit the property keys to particular values. If you want to accept all possible string-valued keys, you could do something like Record<string, T>, but the idiomatic way of doing that is to use an index signature like { [k: string]: T }.

  1. Does the K generic forbid additional keys on the object that are not K, or does it allow them and just indicate that their properties are not transformed to T?

It doesn't exactly "forbid" additional keys: after all, a value is generally allowed to have properties not explicitly mentioned in its type... but it wouldn't recognize that such properties exist:

declare const x: Record<"a", string>;
x.b; // error, Property 'b' does not exist on type 'Record<"a", string>'

and it would treat them as excess properties which are sometimes rejected:

declare function acceptR(x: Record<"a", string>): void;
acceptR({a: "hey", b: "you"}); // error, Object literal may only specify known properties

and sometimes accepted:

const y = {a: "hey", b: "you"};
acceptR(y); // okay
  1. With the given example:

    type ThreeStringProps = Record<'prop1' | 'prop2' | 'prop3', string>
    

    Is it exactly the same as this?:

    type ThreeStringProps = {prop1: string, prop2: string, prop3: string}
    

Yes!

Hope that helps. Good luck!

CMake complains "The CXX compiler identification is unknown"

Your /home/gnu/bin/c++ seem to require additional flag to link things properly and CMake doesn't know about that.

To use /usr/bin/c++ as your compiler run cmake with -DCMAKE_CXX_COMPILER=/usr/bin/c++.

Also, CMAKE_PREFIX_PATH variable sets destination dir where your project' files should be installed. It has nothing to do with CMake installation prefix and CMake itself already know this.

Android draw a Horizontal line between views

_x000D_
_x000D_
 <view
        android:id="@+id/blackLine"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#000000"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"/>
_x000D_
_x000D_
_x000D_

app:layout_constraintStart_toStartOf="parent"/>

Reading Email using Pop3 in C#

I just tried SMTPop and it worked.

  1. I downloaded this.
  2. Added smtpop.dll reference to my C# .NET project

Wrote the following code:

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

namespace SMT_POP3 {

    class Program {
        static void Main(string[] args) {
            SmtPop.POP3Client pop = new SmtPop.POP3Client();
            pop.Open("<hostURL>", 110, "<username>", "<password>");

            // Get message list from POP server
            SmtPop.POPMessageId[] messages = pop.GetMailList();
            if (messages != null) {

                // Walk attachment list
                foreach(SmtPop.POPMessageId id in messages) {
                    SmtPop.POPReader reader= pop.GetMailReader(id);
                    SmtPop.MimeMessage msg = new SmtPop.MimeMessage();

                    // Read message
                    msg.Read(reader);
                    if (msg.AddressFrom != null) {
                        String from= msg.AddressFrom[0].Name;
                        Console.WriteLine("from: " + from);
                    }
                    if (msg.Subject != null) {
                        String subject = msg.Subject;
                        Console.WriteLine("subject: "+ subject);
                    }
                    if (msg.Body != null) {
                        String body = msg.Body;
                        Console.WriteLine("body: " + body);
                    }
                    if (msg.Attachments != null && false) {
                        // Do something with first attachment
                        SmtPop.MimeAttachment attach = msg.Attachments[0];

                        if (attach.Filename == "data") {
                           // Read data from attachment
                           Byte[] b = Convert.FromBase64String(attach.Body);
                           System.IO.MemoryStream mem = new System.IO.MemoryStream(b, false);

                           //BinaryFormatter f = new BinaryFormatter();
                           // DataClass data= (DataClass)f.Deserialize(mem); 
                           mem.Close();
                        }                     

                        // Delete message
                        // pop.Dele(id.Id);
                    }
               }
           }    
           pop.Quit();
        }
    }
}

Adding up BigDecimals using Streams

This post already has a checked answer, but the answer doesn't filter for null values. The correct answer should prevent null values by using the Object::nonNull function as a predicate.

BigDecimal result = invoiceList.stream()
    .map(Invoice::total)
    .filter(Objects::nonNull)
    .filter(i -> (i.getUnit_price() != null) && (i.getQuantity != null))
    .reduce(BigDecimal.ZERO, BigDecimal::add);

This prevents null values from attempting to be summed as we reduce.

Inserting a PDF file in LaTeX

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

\usepackage{pdfpages}

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

How can I change all input values to uppercase using Jquery?

$('#id-submit').click(function () {
    $("input").val(function(i,val) {
        return val.toUpperCase();
    });
});

FIDDLE

One line if statement not working

For simplicity, If you need to default to some value if nil you can use:

@something.nil? = "No" || "Yes"

How to Read and Write from the Serial Port

Note that usage of a SerialPort.DataReceived event is optional. You can set proper timeout using SerialPort.ReadTimeout and continuously call SerialPort.Read() after you wrote something to a port until you get a full response.

Moreover you can use SerialPort.BaseStream property to extract an underlying Stream instance. The benefit of using a Stream is that you can easily utilize various decorators with it:

var port = new SerialPort();
// LoggingStream inherits Stream, implements IDisposable, needen abstract methods and 
// overrides needen virtual methods. 
Stream portStream = new LoggingStream(port.BaseStream);
portStream.Write(...); // Logs write buffer.
portStream.Read(...); // Logs read buffer.

For more information check:

How to put labels over geom_bar in R with ggplot2

Another solution is to use stat_count() when dealing with discrete variables (and stat_bin() with continuous ones).

ggplot(data = df, aes(x = x)) +
geom_bar(stat = "count") + 
stat_count(geom = "text", colour = "white", size = 3.5,
aes(label = ..count..),position=position_stack(vjust=0.5))

enter image description here

node and Error: EMFILE, too many open files

Had the same problem when running the nodemon command so i reduced the name of files open in sublime text and the error dissappeared.

Python list / sublist selection -1 weirdness

If you want to get a sub list including the last element, you leave blank after colon:

>>> ll=range(10)
>>> ll
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> ll[5:]
[5, 6, 7, 8, 9]
>>> ll[:]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

How to make URL/Phone-clickable UILabel?

Why not just use NSMutableAttributedString?

let attributedString = NSMutableAttributedString(string: "Want to learn iOS? Just visit developer.apple.com!")
        attributedString.addAttribute(.link, value: "https://developer.apple.com", range: NSRange(location: 30, length: 50))

        myView.attributedText = attributedString

You can find more details here

How to convert a Date to a formatted string in VB.net?

myDate.ToString("yyyy-MM-dd HH:mm:ss")

the capital HH is for 24 hours format as you specified

Looping through all rows in a table column, Excel-VBA

I came across the same problem but no forum could help me, after some minutes I came out with an idea:

match(ColumnHeader,Table1[#Headers],0)

This will return you the number.

Convert a list of characters into a string

The reduce function also works

import operator
h=['a','b','c','d']
reduce(operator.add, h)
'abcd'

How to echo out the values of this array?

The problem here is in your explode statement

//$item['date'] presumably = 20120514.  Do a print of this
$eventDate = trim($item['date']);

//This explodes on , but there is no , in $eventDate
//You also have a limit of 2 set in the below explode statement
$myarray = (explode(',', $eventDate, 2));

 //$myarray is currently = to '20'

 foreach ($myarray as $value) {
    //Now you are iterating through a string
    echo $value;
 }

Try changing your initial $item['date'] to be 2012,04,30 if that's what you're trying to do. Otherwise I'm not entirely sure what you're trying to print.

Eliminate extra separators below UITableView

I just add this line at the ViewDidLoad function and problem fixed.

tableView.tableFooterView = [[UIView alloc] init]; 

How do I get countifs to select all non-blank cells in Excel?

If multiple criteria use countifs

=countifs(A1:A10,">""",B1:B10,">""")

The " >"" " looks at the greater than being empty. This formula looks for two criteria and neither column can be empty on the same row for it to count. If just counting one column do this with the one criteria (i.e. Use everything before B1:B10 not including the comma)

Changing text color of menu item in navigation drawer

I used below code to change Navigation drawer text color in my app.

NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setItemTextColor(ColorStateList.valueOf(Color.WHITE));

Reason: no suitable image found

Cited from Technical Q&A QA1886:

Swift app crashes when trying to reference Swift library libswiftCore.dylib.

Q: What can I do about the libswiftCore.dylib loading error in my device's console that happens when I try to run my Swift language app?

A: To correct this problem, you will need to sign your app using code signing certificates with the Subject Organizational Unit (OU) set to your Team ID. All Enterprise and standard iOS developer certificates that are created after iOS 8 was released have the new Team ID field in the proper place to allow Swift language apps to run.

Usually this error appears in the device's console log with a message similar to one of the following: [....] [deny-mmap] mapped file has no team identifier and is not a platform binary: /private/var/mobile/Containers/Bundle/Application/5D8FB2F7-1083-4564-94B2-0CB7DC75C9D1/YourAppNameHere.app/Frameworks/libswiftCore.dylib

Dyld Error Message:
  Library not loaded: @rpath/libswiftCore.dylib

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000120021088
Triggered by Thread: 0

Referenced from: /private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/TestApp
Reason: no suitable image found. Did find:
/private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/Frameworks/libswiftCore.dylib: mmap() error 1 at address=0x1001D8000, size=0x00194000 segment=__TEXT in Segment::map() mapping /private/var/mobile/Containers/Bundle/Application/C3DCD586-2A40-4C7C-AA2B-64EDAE8339E2/TestApp.app/Frameworks/libswiftCore.dylib
Dyld Version: 353.5

The new certificates are needed when building an archive and packaging your app. Even if you have one of the new certificates, just resigning an existing swift app archive won’t work. If it was built with a pre-iOS 8 certificate, you will need to build another archive.

Important: Please use caution if you need to revoke and setup up a new Enterprise Distribution certificate. If you are an in-house Enterprise developer you will need to be careful that you do not revoke a distribution certificate that was used to sign an app any one of your Enterprise employees is still using as any apps that were signed with that enterprise distribution certificate will stop working immediately. The above only applies to Enterprise Distribution certificates. Development certs are safe to revoke for enterprise/standard iOS developers.

As the AirSign guys state the problem roots from the missing OU attribute in the subject field of the In-House certificate.

Subject: UID=269J2W3P2L, CN=iPhone Distribution: Company Name, OU=269J2W3P2L, O=Company Name, C=FR

I have an enterprise development certificate, creating a new one solved the issue.

postgres, ubuntu how to restart service on startup? get stuck on clustering after instance reboot

I guess it would be best to fix the database startup script itself. But as a work around, you can add that line to /etc/rc.local, which is executed about last in init phase.

Get rid of "The value for annotation attribute must be a constant expression" message

This is what a constant expression in Java looks like:

package com.mycompany.mypackage;

public class MyLinks {
  // constant expression
  public static final String GUESTBOOK_URL = "/guestbook";
}

You can use it with annotations as following:

import com.mycompany.mypackage.MyLinks;

@WebServlet(urlPatterns = {MyLinks.GUESTBOOK_URL})
public class GuestbookServlet extends HttpServlet {
  // ...
}

JavaFX Panel inside Panel auto resizing

Also see here

@FXML
private void mnuUserLevel_onClick(ActionEvent event) {
    FXMLLoader loader = new FXMLLoader(getClass().getResource("DBedit.fxml"));
    loader.setController(new DBeditEntityUserlevel());

    try {
           Node n = (Node)loader.load();
           AnchorPane.setTopAnchor(n, 0.0);
           AnchorPane.setRightAnchor(n, 0.0);
           AnchorPane.setLeftAnchor(n, 0.0);
           AnchorPane.setBottomAnchor(n, 0.0);
           mainContent.getChildren().setAll(n);
    } catch (IOException e){
           System.out.println(e.getMessage());
    }
}

The scenario is to load a child fxml into parent AnchorPane. To make the child to stretch in accords to its parent use AnChorPane.setxxxAnchor command.

How can I get phone serial number (IMEI)

pls refer this https://stackoverflow.com/a/1972404/951045

 TelephonyManager mngr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE); 
  mngr.getDeviceId();

add READ_PHONE_STATE permission to AndroidManifest.xml

How to round an image with Glide library?

Roman Samoylenko's answer was correct except the function has changed. The correct answer is

Glide.with(context)
                .load(yourImage)
                .apply(RequestOptions.circleCropTransform())
                .into(imageView);

Call one constructor from another

Error handling and making your code reusable is key. I added string to int validation and it is possible to add other types if needed. Solving this problem with a more reusable solution could be this:

public class Sample
{
    public Sample(object inputToInt)
    {
        _intField = objectToInt(inputToInt);
    }

    public int IntProperty => _intField;

    private readonly int _intField;
}

public static int objectToInt(object inputToInt)
{
    switch (inputToInt)
        {
            case int inputInt:
                return inputInt;
            break;
            case string inputString:
            if (!int.TryParse(inputString, out int parsedInt))
            {
                throw new InvalidParameterException($"The input {inputString} could not be parsed to int");
            }
            return parsedInt;

            default:
                throw new InvalidParameterException($"Constructor do not support {inputToInt.GetType().Name}");
            break;
        }
}

Retrieving Data from SQL Using pyodbc

Instead of using the pyodbc library, use the pypyodbc library... This worked for me.

import pypyodbc

conn = pypyodbc.connect("DRIVER={SQL Server};"
                    "SERVER=server;"
                    "DATABASE=database;"
                    "Trusted_Connection=yes;")

cursor = conn.cursor()
cursor.execute('SELECT * FROM [table]')

for row in cursor:
    print('row = %r' % (row,))

Event binding on dynamically created elements?

This is done by event delegation. Event will get bind on wrapper-class element but will be delegated to selector-class element. This is how it works.

$('.wrapper-class').on("click", '.selector-class', function() {
    // Your code here
});

And HTML

<div class="wrapper-class">
    <button class="selector-class">
      Click Me!
    </button>
</div>    

#Note: wrapper-class element can be anything ex. document, body or your wrapper. Wrapper should already exist. However, selector doesn't necessarily needs to be presented at page loading time. It may come later and the event will bind on selector without fail.

How can I install packages using pip according to the requirements.txt file from a local directory?

Use:

pip install -r requirements.txt

For further details, please check the help option:

pip install --help

We can find the option '-r' -

-r, --requirement Install from the given requirements file. This option can be used multiple times.

Further information on some commonly used pip install options (this is the help option on the pip install command):

Enter image description here

Also the above is the complete set of options. Please use pip install --help for the complete list of options.

How to unescape a Java string literal in Java?

Java 13 added a method which does this: String#translateEscapes.

It was a preview feature in Java 13 and 14, but was promoted to a full feature in Java 15.

How to extract a substring using regex

Some how the group(1) didnt work for me. I used group(0) to find the url version.

Pattern urlVersionPattern = Pattern.compile("\\/v[0-9][a-z]{0,1}\\/");
Matcher m = urlVersionPattern.matcher(url);
if (m.find()) { 
    return StringUtils.substringBetween(m.group(0), "/", "/");
}
return "v0";

Check if a file exists or not in Windows PowerShell?

cls

$exactadminfile = "C:\temp\files\admin" #First folder to check the file

$userfile = "C:\temp\files\user" #Second folder to check the file

$filenames=Get-Content "C:\temp\files\files-to-watch.txt" #Reading the names of the files to test the existance in one of the above locations

foreach ($filename in $filenames) {
  if (!(Test-Path $exactadminfile\$filename) -and !(Test-Path $userfile\$filename)) { #if the file is not there in either of the folder
    Write-Warning "$filename absent from both locations"
  } else {
    Write-Host " $filename  File is there in one or both Locations" #if file exists there at both locations or at least in one location
  }
}

How to execute a function when page has fully loaded?

In modern browsers with modern javascript (>= 2015) you can add type="module" to your script tag, and everything inside that script will execute after whole page loads. e.g:

<script type="module">
  alert("runs after") // Whole page loads before this line execute
</script>
<script>
  alert("runs before")
</script>

also older browsers will understand nomodule attribute. Something like this:

<script nomodule>
  alert("tuns after")
</script>

For more information you can visit javascript.info.

What's NSLocalizedString equivalent in Swift?

Actually, you can use two phases to translate your texts in Swift projects:

1) The first phase is using the old way to create all your translatable strings:

NSLocalisedString("Text to translate", comment: "Comment to comment")

1.1) Then you should use genstrings to generate Localizable.strings:

$ genstrings *swift

2) Afterwards, you should use this answer.

2.1) Use your XCode "Find and Replace" option based on the regular expression. As for the given example (if you have no comments) the regular expression will be:

NSLocalizedString\((.*)\, comment:\ \"\"\) 

and replace it with

$1.localized

or (if you have comments)

NSLocalizedString\((.*)\, comment:\ (.*)\)

and replace it with

$1.localizedWithComment(comment: $2)

You are free to play with regex and different extension combinations as you wish. The general way is splitting the whole process in two phases. Hope that helps.

Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android

I had this issue occurring with mailto: and tel: links inside an iframe (in Chrome, not a webview). Clicking the links would show the grey "page not found" page and inspecting the page showed it had a ERR_UNKNOWN_URL_SCHEME error.

Adding target="_blank", as suggested by this discussion of the issue fixed the problem for me.

Mount current directory as a volume in Docker on Windows 10

This works for me in PowerShell:

docker run --rm -v ${PWD}:/data alpine ls /data

How to check type of files without extensions in python?

also you can use this code (pure python by 3 byte of header file):

full_path = os.path.join(MEDIA_ROOT, pathfile)

try:
    image_data = open(full_path, "rb").read()
except IOError:
    return "Incorrect Request :( !!!"

header_byte = image_data[0:3].encode("hex").lower()

if header_byte == '474946':
    return "image/gif"
elif header_byte == '89504e':
    return "image/png"
elif header_byte == 'ffd8ff':
    return "image/jpeg"
else:
    return "binary file"

without any package install [and update version]

How to get JavaScript caller function line number? How to get JavaScript caller source URL?

Here is what I wrote based on info found on this forum:

This is part of a MyDebugNamespace, Debug is apparently reserved and won't do as namespace name.

    var DEBUG = true;

...

    if (true == DEBUG && !test)
    {
        var sAlert = "Assertion failed! ";
        if (null != message)
            sAlert += "\n" + message;
        if (null != err)
            sAlert += "\n" + "File: " + err.fileName + "\n" + "Line: " + err.lineNumber;
        alert(sAlert);
    }

...

How to call:

    MyDebugNamespace.Assert(new Error(""), (null != someVar), "Something is wrong!")

I included two functions with variable number of arguments calling this base code in my namespace so as to optionally omit message or error in calls.

This works fine with Firefox, IE6 and Chrome report the fileName and lineNumber as undefined.

How do I assign a port mapping to an existing Docker container?

we an use handy tools like ssh to accomplish this easily.

I was using ubuntu host and ubuntu based docker image.

  1. Inside docker have openssh-client installed.
  2. Outside docker (host) have openssh-server server installed.

when a new port is needed to be mapped out,

inside the docker run the following command

ssh -R8888:localhost:8888 <username>@172.17.0.1

172.17.0.1 was the ip of the docker interface (you can get this by running ifconfig docker0 | grep "inet addr" | cut -f2 -d":" | cut -f1 -d" " on the host).

here I had local 8888 port mapped back to the hosts 8888. you can change the port as needed.

if you need one more port, you can kill the ssh and add one more line of -R to it with the new port.

I have tested this with netcat.

How do I parse JSON in Android?

Android has all the tools you need to parse json built-in. Example follows, no need for GSON or anything like that.

Get your JSON:

Assume you have a json string

String result = "{\"someKey\":\"someValue\"}";

Create a JSONObject:

JSONObject jObject = new JSONObject(result);

If your json string is an array, e.g.:

String result = "[{\"someKey\":\"someValue\"}]"

then you should use JSONArray as demonstrated below and not JSONObject

To get a specific string

String aJsonString = jObject.getString("STRINGNAME");

To get a specific boolean

boolean aJsonBoolean = jObject.getBoolean("BOOLEANNAME");

To get a specific integer

int aJsonInteger = jObject.getInt("INTEGERNAME");

To get a specific long

long aJsonLong = jObject.getLong("LONGNAME");

To get a specific double

double aJsonDouble = jObject.getDouble("DOUBLENAME");

To get a specific JSONArray:

JSONArray jArray = jObject.getJSONArray("ARRAYNAME");

To get the items from the array

for (int i=0; i < jArray.length(); i++)
{
    try {
        JSONObject oneObject = jArray.getJSONObject(i);
        // Pulling items from the array
        String oneObjectsItem = oneObject.getString("STRINGNAMEinTHEarray");
        String oneObjectsItem2 = oneObject.getString("anotherSTRINGNAMEINtheARRAY");
    } catch (JSONException e) {
        // Oops
    }
}

A SELECT statement that assigns a value to a variable must not be combined with data-retrieval operations

declare @cur cursor
declare @idx int       
declare @Approval_No varchar(50) 

declare @ReqNo varchar(100)
declare @M_Id  varchar(100)
declare @Mail_ID varchar(100)
declare @temp  table
(
val varchar(100)
)
declare @temp2  table
(
appno varchar(100),
mailid varchar(100),
userod varchar(100)
)


    declare @slice varchar(8000)       
    declare @String varchar(100)
    --set @String = '1200096,1200095,1200094,1200093,1200092,1200092'
set @String = '20131'


    select @idx = 1       
        if len(@String)<1 or @String is null  return       

    while @idx!= 0       
    begin       
        set @idx = charindex(',',@String)       
        if @idx!=0       
            set @slice = left(@String,@idx - 1)       
        else       
            set @slice = @String

            --select @slice       
            insert into @temp values(@slice)
        set @String = right(@String,len(@String) - @idx)       
        if len(@String) = 0 break


    end
    -- select distinct(val) from @temp


SET @cur = CURSOR FOR select distinct(val) from @temp


--open cursor    
OPEN @cur    
--fetchng id into variable    
FETCH NEXT    
    FROM @cur into @Approval_No 

      --
    --loop still the end    
     while @@FETCH_STATUS = 0  
    BEGIN   


select distinct(Approval_Sr_No) as asd, @ReqNo=Approval_Sr_No,@M_Id=AM_ID,@Mail_ID=Mail_ID from WFMS_PRAO,WFMS_USERMASTER where  WFMS_PRAO.AM_ID=WFMS_USERMASTER.User_ID
and Approval_Sr_No=@Approval_No

   insert into @temp2 values(@ReqNo,@M_Id,@Mail_ID)  

FETCH NEXT    
      FROM @cur into @Approval_No    
 end  
    --close cursor    
    CLOSE @cur    

select * from @tem

Converting two lists into a matrix

Assuming lengths of portfolio and index are the same:

matrix = []
for i in range(len(portfolio)):
    matrix.append([portfolio[i], index[i]])

Or a one-liner using list comprehension:

matrix2 = [[portfolio[i], index[i]] for i in range(len(portfolio))]

How to pass password automatically for rsync SSH command?

Following the idea posted by Andrew Seaford, this is done using sshfs:

echo "SuperHardToGuessPass:P" | sshfs -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no [email protected]:/mypath/ /mnt/source-tmp/ -o workaround=rename -o password_stdin
rsync -a /mnt/source-tmp/ /media/destination/
umount /mnt/source-tmp

How to split the filename from a full path in batch?

I don't know that much about batch files but couldn't you have a pre-made batch file copied from the home directory to the path you have that would return a list of the names of the files then use that name?

Here is a link I think might be helpful in making the pre-made batch file.

http://www.ericphelps.com/batch/lists/filelist.htm

how to pass variable from shell script to sqlplus

You appear to have a heredoc containing a single SQL*Plus command, though it doesn't look right as noted in the comments. You can either pass a value in the heredoc:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql BUILDING
exit;
EOF

or if BUILDING is $2 in your script:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql $2
exit;
EOF

If your file.sql had an exit at the end then it would be even simpler as you wouldn't need the heredoc:

sqlplus -S user/pass@localhost @/opt/D2RQ/file.sql $2

In your SQL you can then refer to the position parameters using substitution variables:

...
}',SEM_Models('&1'),NULL,
...

The &1 will be replaced with the first value passed to the SQL script, BUILDING; because that is a string it still needs to be enclosed in quotes. You might want to set verify off to stop if showing you the substitutions in the output.


You can pass multiple values, and refer to them sequentially just as you would positional parameters in a shell script - the first passed parameter is &1, the second is &2, etc. You can use substitution variables anywhere in the SQL script, so they can be used as column aliases with no problem - you just have to be careful adding an extra parameter that you either add it to the end of the list (which makes the numbering out of order in the script, potentially) or adjust everything to match:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count BUILDING
exit;
EOF

or:

sqlplus -S user/pass@localhost << EOF
@/opt/D2RQ/file.sql total_count $2
exit;
EOF

If total_count is being passed to your shell script then just use its positional parameter, $4 or whatever. And your SQL would then be:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&2'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

If you pass a lot of values you may find it clearer to use the positional parameters to define named parameters, so any ordering issues are all dealt with at the start of the script, where they are easier to maintain:

define MY_ALIAS = &1
define MY_MODEL = &2

SELECT COUNT(*) as &MY_ALIAS
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&MY_MODEL'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

From your separate question, maybe you just wanted:

SELECT COUNT(*) as &1
FROM TABLE(SEM_MATCH(
'{
        ?s rdf:type :ProcessSpec .
        ?s ?p ?o
}',SEM_Models('&1'),NULL,
SEM_ALIASES(SEM_ALIAS('','http://VISION/DataSource/SEMANTIC_CACHE#')),NULL));

... so the alias will be the same value you're querying on (the value in $2, or BUILDING in the original part of the answer). You can refer to a substitution variable as many times as you want.

That might not be easy to use if you're running it multiple times, as it will appear as a header above the count value in each bit of output. Maybe this would be more parsable later:

select '&1' as QUERIED_VALUE, COUNT(*) as TOTAL_COUNT

If you set pages 0 and set heading off, your repeated calls might appear in a neat list. You might also need to set tab off and possibly use rpad('&1', 20) or similar to make that column always the same width. Or get the results as CSV with:

select '&1' ||','|| COUNT(*)

Depends what you're using the results for...

How do I hide anchor text without hiding the anchor?

How about display: none;

That hides anything.

What is going wrong when Visual Studio tells me "xcopy exited with code 4"

Xcopy exit code 4 means "Initialization error occurred. There is not enough memory or disk space, or you entered an invalid drive name or invalid syntax on the command line."

It looks like Visual Studio is supplying invalid arguments to xcopy. Check your post-build event command via Project > Right Click > Properties > Build Events > Post Build Event.

Note that if the $(ProjectDir) or similar macro terms have spaces in the resulting paths when expanded, then they will need to be wrapped in double quotes. For example:

xcopy "$(ProjectDir)Library\dsoframer.ocx" "$(TargetDir)" /Y /E /D1

How to present a simple alert message in java?

Assuming you already have a JFrame to call this from:

JOptionPane.showMessageDialog(frame, "thank you for using java");

See The Java Tutorials: How to Make Dialogs
See the JavaDoc

Integrity constraint violation: 1452 Cannot add or update a child row:

First delete the constraint "fk_comments_projects1" and also its index. After that recreate it.

Creating new database from a backup of another Database on the same server?

Checking the Options Over Write Database worked for me :)

enter image description here

How to replicate vector in c?

They would start by hiding the defining a structure that would hold members necessary for the implementation. Then providing a group of functions that would manipulate the contents of the structure.

Something like this:

typedef struct vec
{
    unsigned char* _mem;
    unsigned long _elems;
    unsigned long _elemsize;
    unsigned long _capelems;
    unsigned long _reserve;
};

vec* vec_new(unsigned long elemsize)
{
    vec* pvec = (vec*)malloc(sizeof(vec));
    pvec->_reserve = 10;
    pvec->_capelems = pvec->_reserve;
    pvec->_elemsize = elemsize;
    pvec->_elems = 0;
    pvec->_mem = (unsigned char*)malloc(pvec->_capelems * pvec->_elemsize);
    return pvec;
}

void vec_delete(vec* pvec)
{
    free(pvec->_mem);
    free(pvec);
}

void vec_grow(vec* pvec)
{
    unsigned char* mem = (unsigned char*)malloc((pvec->_capelems + pvec->_reserve) * pvec->_elemsize);
    memcpy(mem, pvec->_mem, pvec->_elems * pvec->_elemsize);
    free(pvec->_mem);
    pvec->_mem = mem;
    pvec->_capelems += pvec->_reserve;
}

void vec_push_back(vec* pvec, void* data, unsigned long elemsize)
{
    assert(elemsize == pvec->_elemsize);
    if (pvec->_elems == pvec->_capelems) {
        vec_grow(pvec);
    }
    memcpy(pvec->_mem + (pvec->_elems * pvec->_elemsize), (unsigned char*)data, pvec->_elemsize);
    pvec->_elems++;    
}

unsigned long vec_length(vec* pvec)
{
    return pvec->_elems;
}

void* vec_get(vec* pvec, unsigned long index)
{
    assert(index < pvec->_elems);
    return (void*)(pvec->_mem + (index * pvec->_elemsize));
}

void vec_copy_item(vec* pvec, void* dest, unsigned long index)
{
    memcpy(dest, vec_get(pvec, index), pvec->_elemsize);
}

void playwithvec()
{
    vec* pvec = vec_new(sizeof(int));

    for (int val = 0; val < 1000; val += 10) {
        vec_push_back(pvec, &val, sizeof(val));
    }

    for (unsigned long index = (int)vec_length(pvec) - 1; (int)index >= 0; index--) {
        int val;
        vec_copy_item(pvec, &val, index);
        printf("vec(%d) = %d\n", index, val);
    }

    vec_delete(pvec);
}

Further to this they would achieve encapsulation by using void* in the place of vec* for the function group, and actually hide the structure definition from the user by defining it within the C module containing the group of functions rather than the header. Also they would hide the functions that you would consider to be private, by leaving them out from the header and simply prototyping them only in the C module.

How to obtain Signing certificate fingerprint (SHA1) for OAuth 2.0 on Android?

use this in the command line

c:\Program Files\Java\jdk1.6.25\bin>keytool -list -v -keystore c:\you_key_here.key

Using braces with dynamic variable names in PHP

Overview

In PHP, you can just put an extra $ in front of a variable to make it a dynamic variable :

$$variableName = $value;

While I wouldn't recommend it, you could even chain this behavior :

$$$$$$$$DoNotTryThisAtHomeKids = $value;

You can but are not forced to put $variableName between {} :

${$variableName} = $value;

Using {} is only mandatory when the name of your variable is itself a composition of multiple values, like this :

${$variableNamePart1 . $variableNamePart2} = $value;

It is nevertheless recommended to always use {}, because it's more readable.

Differences between PHP5 and PHP7

Another reason to always use {}, is that PHP5 and PHP7 have a slightly different way of dealing with dynamic variables, which results in a different outcome in some cases.

In PHP7, dynamic variables, properties, and methods will now be evaluated strictly in left-to-right order, as opposed to the mix of special cases in PHP5. The examples below show how the order of evaluation has changed.

Case 1 : $$foo['bar']['baz']

  • PHP5 interpetation : ${$foo['bar']['baz']}
  • PHP7 interpetation : ${$foo}['bar']['baz']

Case 2 : $foo->$bar['baz']

  • PHP5 interpetation : $foo->{$bar['baz']}
  • PHP7 interpetation : $foo->{$bar}['baz']

Case 3 : $foo->$bar['baz']()

  • PHP5 interpetation : $foo->{$bar['baz']}()
  • PHP7 interpetation : $foo->{$bar}['baz']()

Case 4 : Foo::$bar['baz']()

  • PHP5 interpetation : Foo::{$bar['baz']}()
  • PHP7 interpetation : Foo::{$bar}['baz']()

What do these three dots in React do?

For someone who wants to understand this simple and fast:

First of all, this is not a syntax only to react. this is a syntax from ES6 called Spread syntax which iterate(merge, add..etc) array and object. read more about here

So answer to the question: let's imagine you have this tag:

<UserTag name="Supun" age="66" gender="male" />

and You do this:

const user = {
  "name"=>"Joe",
  "age"=>"50"      
  "test"=>"test-val"
};

<UserTag name="Supun" gender="male"  {...user} age="66" />

then the tag will equal this:

<UserTag name="Joe" gender="male" test="test-val" age="66" />

So what happened was when you use Spread syntax in a react tag it takes tag's attribute as object attributes which merge(replace if it exists) with the given object user. also, you might have noticed one thing that it only replaces before attribute, not after attributes. so in this example age remains as it is.

Hopes this helps :)

Automatic confirmation of deletion in powershell

The default is: no prompt.

You can enable it with -Confirm or disable it with -Confirm:$false

However, it will still prompt, when the target:

  • is a directory
  • and it is not empty
  • and the -Recurse parameter is not specified.

-Force is required to also remove hidden and read-only items etc.

To sum it up:

Remove-Item -Recurse -Force -Confirm:$false

...should cover all scenarios.

Swift GET request with parameters

When building a GET request, there is no body to the request, but rather everything goes on the URL. To build a URL (and properly percent escaping it), you can also use URLComponents.

var url = URLComponents(string: "https://www.google.com/search/")!

url.queryItems = [
    URLQueryItem(name: "q", value: "War & Peace")
]

The only trick is that most web services need + character percent escaped (because they'll interpret that as a space character as dictated by the application/x-www-form-urlencoded specification). But URLComponents will not percent escape it. Apple contends that + is a valid character in a query and therefore shouldn't be escaped. Technically, they are correct, that it is allowed in a query of a URI, but it has a special meaning in application/x-www-form-urlencoded requests and really should not be passed unescaped.

Apple acknowledges that we have to percent escaping the + characters, but advises that we do it manually:

var url = URLComponents(string: "https://www.wolframalpha.com/input/")!

url.queryItems = [
    URLQueryItem(name: "i", value: "1+2")
]

url.percentEncodedQuery = url.percentEncodedQuery?.replacingOccurrences(of: "+", with: "%2B")

This is an inelegant work-around, but it works, and is what Apple advises if your queries may include a + character and you have a server that interprets them as spaces.

So, combining that with your sendRequest routine, you end up with something like:

func sendRequest(_ url: String, parameters: [String: String], completion: @escaping ([String: Any]?, Error?) -> Void) {
    var components = URLComponents(string: url)!
    components.queryItems = parameters.map { (key, value) in 
        URLQueryItem(name: key, value: value) 
    }
    components.percentEncodedQuery = components.percentEncodedQuery?.replacingOccurrences(of: "+", with: "%2B")
    let request = URLRequest(url: components.url!)

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data,                            // is there data
            let response = response as? HTTPURLResponse,  // is there HTTP response
            (200 ..< 300) ~= response.statusCode,         // is statusCode 2XX
            error == nil else {                           // was there no error, otherwise ...
                completion(nil, error)
                return
        }

        let responseObject = (try? JSONSerialization.jsonObject(with: data)) as? [String: Any]
        completion(responseObject, nil)
    }
    task.resume()
}

And you'd call it like:

sendRequest("someurl", parameters: ["foo": "bar"]) { responseObject, error in
    guard let responseObject = responseObject, error == nil else {
        print(error ?? "Unknown error")
        return
    }

    // use `responseObject` here
}

Personally, I'd use JSONDecoder nowadays and return a custom struct rather than a dictionary, but that's not really relevant here. Hopefully this illustrates the basic idea of how to percent encode the parameters into the URL of a GET request.


See previous revision of this answer for Swift 2 and manual percent escaping renditions.

How can I generate a unique ID in Python?

import time
import random
import socket
import hashlib

def guid( *args ):
    """
    Generates a universally unique ID.
    Any arguments only create more randomness.
    """
    t = long( time.time() * 1000 )
    r = long( random.random()*100000000000000000L )
    try:
        a = socket.gethostbyname( socket.gethostname() )
    except:
        # if we can't get a network address, just imagine one
        a = random.random()*100000000000000000L
    data = str(t)+' '+str(r)+' '+str(a)+' '+str(args)
    data = hashlib.md5(data).hexdigest()

    return data

How to git commit a single file/directory

Use the -o option.

git commit -o path/to/myfile -m "the message"

-o, --only commit only specified files

maxFileSize and acceptFileTypes in blueimp file upload plugin do not work. Why?

As suggested in an earlier answer, we need to include two additional files - jquery.fileupload-process.js and then jquery.fileupload-validate.js However as I need to perform some additional ajax calls while adding a file, I am subscribing to the fileuploadadd event to perform those calls. Regarding such a usage the author of this plugin suggested the following

Please have a look here: https://github.com/blueimp/jQuery-File-Upload/wiki/Options#wiki-callback-options

Adding additional event listeners via bind (or on method with jQuery 1.7+) method is the preferred option to preserve callback settings by the jQuery File Upload UI version.

Alternatively, you can also simply start the processing in your own callback, like this: https://github.com/blueimp/jQuery-File-Upload/blob/master/js/jquery.fileupload-process.js#L50

Using the combination of the two suggested options, the following code works perfectly for me

$fileInput.fileupload({
    url: 'upload_url',
    type: 'POST',
    dataType: 'json',
    autoUpload: false,
    disableValidation: false,
    maxFileSize: 1024 * 1024,
    messages: {
        maxFileSize: 'File exceeds maximum allowed size of 1MB',
    }
});

$fileInput.on('fileuploadadd', function(evt, data) {
    var $this = $(this);
    var validation = data.process(function () {
        return $this.fileupload('process', data);
    });

    validation.done(function() {
        makeAjaxCall('some_other_url', { fileName: data.files[0].name, fileSizeInBytes: data.files[0].size })
            .done(function(resp) {
                data.formData = data.formData || {};
                data.formData.someData = resp.SomeData;
                data.submit();
        });
    });
    validation.fail(function(data) {
        console.log('Upload error: ' + data.files[0].error);
    });
});

How to playback MKV video in web browser?

You can use this following code. work just on chrome browser.

_x000D_
_x000D_
 function failed(e) {_x000D_
   // video playback failed - show a message saying why_x000D_
   switch (e.target.error.code) {_x000D_
     case e.target.error.MEDIA_ERR_ABORTED:_x000D_
       alert('You aborted the video playback.');_x000D_
       break;_x000D_
     case e.target.error.MEDIA_ERR_NETWORK:_x000D_
       alert('A network error caused the video download to fail part-way.');_x000D_
       break;_x000D_
     case e.target.error.MEDIA_ERR_DECODE:_x000D_
       alert('The video playback was aborted due to a corruption problem or because the video used features your browser did not support.');_x000D_
       break;_x000D_
     case e.target.error.MEDIA_ERR_SRC_NOT_SUPPORTED:_x000D_
       alert('The video could not be loaded, either because the server or network failed or because the format is not supported.');_x000D_
       break;_x000D_
     default:_x000D_
       alert('An unknown error occurred.');_x000D_
       break;_x000D_
   }_x000D_
 }
_x000D_
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">_x000D_
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">_x000D_
_x000D_
<head>_x000D_
 <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />_x000D_
 <meta name="author" content="Amin Developer!" />_x000D_
_x000D_
 <title>Untitled 1</title>_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<p><video src="http://jell.yfish.us/media/Jellyfish-3-Mbps.mkv" type='video/x-matroska; codecs="theora, vorbis"' autoplay controls onerror="failed(event)" ></video></p>_x000D_
<p><a href="YOU mkv FILE LINK GOES HERE TO DOWNLOAD">Download the video file</a>.</p>_x000D_
_x000D_
</body>_x000D_
</html>
_x000D_
_x000D_
_x000D_

Breaking up long strings on multiple lines in Ruby without stripping newlines

Maybe this is what you're looking for?

string = "line #1"\
         "line #2"\
         "line #3"

p string # => "line #1line #2line #3"

Accessing nested JavaScript objects and arrays by string path

Based on a previous answer, I have created a function that can also handle brackets. But no dots inside them due to the split.

function get(obj, str) {
  return str.split(/\.|\[/g).map(function(crumb) {
    return crumb.replace(/\]$/, '').trim().replace(/^(["'])((?:(?!\1)[^\\]|\\.)*?)\1$/, (match, quote, str) => str.replace(/\\(\\)?/g, "$1"));
  }).reduce(function(obj, prop) {
    return obj ? obj[prop] : undefined;
  }, obj);
}

jQuery .ajax() POST Request throws 405 (Method Not Allowed) on RESTful WCF

You can create the required headers in a filter too.

@WebFilter(urlPatterns="/rest/*")
public class AllowAccessFilter implements Filter {
    @Override
    public void doFilter(ServletRequest sRequest, ServletResponse sResponse, FilterChain chain) throws IOException, ServletException {
        System.out.println("in AllowAccessFilter.doFilter");
        HttpServletRequest request = (HttpServletRequest)sRequest;
        HttpServletResponse response = (HttpServletResponse)sResponse;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT");
        response.setHeader("Access-Control-Allow-Headers", "Content-Type"); 
        chain.doFilter(request, response);
    }
    ...
}

Are arrays passed by value or passed by reference in Java?

Everything in Java is passed by value. In case of an array (which is nothing but an Object), the array reference is passed by value (just like an object reference is passed by value).

When you pass an array to other method, actually the reference to that array is copied.

  • Any changes in the content of array through that reference will affect the original array.
  • But changing the reference to point to a new array will not change the existing reference in original method.

See this post: Is Java "pass-by-reference" or "pass-by-value"?

See this working example:

public static void changeContent(int[] arr) {

   // If we change the content of arr.
   arr[0] = 10;  // Will change the content of array in main()
}

public static void changeRef(int[] arr) {
   // If we change the reference
   arr = new int[2];  // Will not change the array in main()
   arr[0] = 15;
}

public static void main(String[] args) {
    int [] arr = new int[2];
    arr[0] = 4;
    arr[1] = 5;

    changeContent(arr);

    System.out.println(arr[0]);  // Will print 10.. 
  
    changeRef(arr);

    System.out.println(arr[0]);  // Will still print 10.. 
                                 // Change the reference doesn't reflect change here..
}

Angularjs $http.get().then and binding to a list

Actually you get promise on $http.get.

Try to use followed flow:

<li ng-repeat="document in documents" ng-class="IsFiltered(document.Filtered)">
    <span><input type="checkbox" name="docChecked" id="doc_{{document.Id}}" ng-model="document.Filtered" /></span>
    <span>{{document.Name}}</span>
</li>

Where documents is your array.

$scope.documents = [];

$http.get('/Documents/DocumentsList/' + caseId).then(function(result) {
    result.data.forEach(function(val, i) { 
        $scope.documents.push(/* put data here*/);
    });
}, function(error) {
    alert(error.message);
});                       

HTTP post XML data in C#

In General:

An example of an easy way to post XML data and get the response (as a string) would be the following function:

public string postXMLData(string destinationUrl, string requestXml)
{
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(destinationUrl);
    byte[] bytes;
    bytes = System.Text.Encoding.ASCII.GetBytes(requestXml);
    request.ContentType = "text/xml; encoding='utf-8'";
    request.ContentLength = bytes.Length;
    request.Method = "POST";
    Stream requestStream = request.GetRequestStream();
    requestStream.Write(bytes, 0, bytes.Length);
    requestStream.Close();
    HttpWebResponse response;
    response = (HttpWebResponse)request.GetResponse();
    if (response.StatusCode == HttpStatusCode.OK)
    {
        Stream responseStream = response.GetResponseStream();
        string responseStr = new StreamReader(responseStream).ReadToEnd();
        return responseStr;
    }
    return null;
}

In your specific situation:

Instead of:

request.ContentType = "application/x-www-form-urlencoded";

use:

request.ContentType = "text/xml; encoding='utf-8'";

Also, remove:

string postData = "XMLData=" + Sendingxml;

And replace:

byte[] byteArray = Encoding.UTF8.GetBytes(postData);

with:

byte[] byteArray = Encoding.UTF8.GetBytes(Sendingxml.ToString());

How does `scp` differ from `rsync`?

rysnc can be useful to run on slow and unreliable connections. So if your download aborts in the middle of a large file rysnc will be able to continue from where it left off when invoked again.

Use rsync -vP username@host:/path/to/file .

The -P option preserves partially downloaded files and also shows progress.

As usual check man rsync

How do I dynamically change the content in an iframe using jquery?

<html>
  <head>
    <script type="text/javascript" src="jquery.js"></script>
    <script>
      $(document).ready(function(){
        var locations = ["http://webPage1.com", "http://webPage2.com"];
        var len = locations.length;
        var iframe = $('#frame');
        var i = 0;
        setInterval(function () {
            iframe.attr('src', locations[++i % len]);
        }, 30000);
      });
    </script>
  </head>
  <body>
    <iframe id="frame"></iframe>
  </body>
</html>

Tkinter: How to use threads to preventing main event loop from "freezing"

When you join the new thread in the main thread, it will wait until the thread finishes, so the GUI will block even though you are using multithreading.

If you want to place the logic portion in a different class, you can subclass Thread directly, and then start a new object of this class when you press the button. The constructor of this subclass of Thread can receive a Queue object and then you will be able to communicate it with the GUI part. So my suggestion is:

  1. Create a Queue object in the main thread
  2. Create a new thread with access to that queue
  3. Check periodically the queue in the main thread

Then you have to solve the problem of what happens if the user clicks two times the same button (it will spawn a new thread with each click), but you can fix it by disabling the start button and enabling it again after you call self.prog_bar.stop().

import Queue

class GUI:
    # ...

    def tb_click(self):
        self.progress()
        self.prog_bar.start()
        self.queue = Queue.Queue()
        ThreadedTask(self.queue).start()
        self.master.after(100, self.process_queue)

    def process_queue(self):
        try:
            msg = self.queue.get(0)
            # Show result of the task if needed
            self.prog_bar.stop()
        except Queue.Empty:
            self.master.after(100, self.process_queue)

class ThreadedTask(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue
    def run(self):
        time.sleep(5)  # Simulate long running process
        self.queue.put("Task finished")

Passive Link in Angular 2 - <a href=""> equivalent

In my case deleting href attribute solve problem as long there is a click function assign to a.

PHP Error: Function name must be a string

Try square braces with your $_COOKIE, not parenthesis. Like this:

<?php
if ($_COOKIE['CaptchaResponseValue'] == "false")
{
    header('Location: index.php');
    return;
}
?>

I also corrected your location header call a little too.

Recover from git reset --hard?

(answer suitable for a subset of users)

If you're on (any recent) macOS, and even if you're away from your Time Machine disk, the OS will have saved hourly backups, called local snapshots.

Enter Time Machine and navigate to the file you lost. The OS will then ask you:

The location to which you're restoring "file.ext" already contains an
item with the same name. Do you want to replace it with the one you're
restoring?

You should be able to recover the file(s) you lost.

How can I show a message box with two buttons?

Cannot be done. MsgBox buttons can only have specific values.
You'll have to roll your own form for this.

To create a MsgBox with two options (Yes/No):

MsgBox("Some Text", vbYesNo)

How to upgrade safely php version in wamp server

To add to the above answer (do steps 1-5).

  1. Click on WAMP -> Select PHP -> Versions: Select the new version installed
  2. Check that your PATH folder is updated to new path to PHP so your OS has same PHP version of WAMP.