Fling gesture detection on grid layout

One of the answers above mentions handling different pixel density but suggests computing the swipe parameters by hand. It is worth noting that you can actually obtain scaled, reasonable values from the system using ViewConfiguration class:

final ViewConfiguration vc = ViewConfiguration.get(getContext());
final int swipeMinDistance = vc.getScaledPagingTouchSlop();
final int swipeThresholdVelocity = vc.getScaledMinimumFlingVelocity();
final int swipeMaxOffPath = vc.getScaledTouchSlop();
// (there is also vc.getScaledMaximumFlingVelocity() one could check against)

I noticed that using these values causes the "feel" of fling to be more consistent between the application and rest of system.

Draw on HTML5 Canvas using a mouse

A super short version, here, without position:absolute in vanilla JavaScript. The main idea is to move the canvas' context to the right coordinates and draw a line. Uncomment click handler and comment mousedown & mousemove handlers below to get a feel for how it is working.

<!DOCTYPE html>
<html>
<body>

<p style="margin: 50px">Just some padding in y direction</p>

<canvas id="myCanvas" width="300" height="300" style="background: #000; margin-left: 100px;">Your browser does not support the HTML5 canvas tag.</canvas>

<script>
    const c = document.getElementById("myCanvas");
    // c.addEventListener("click", penTool); // fires after mouse left btn is released
    c.addEventListener("mousedown", setLastCoords); // fires before mouse left btn is released
    c.addEventListener("mousemove", freeForm);


    const ctx = c.getContext("2d");

    function setLastCoords(e) {
        const {x, y} = c.getBoundingClientRect();
        lastX = e.clientX - x;
        lastY = e.clientY - y;
    }

    function freeForm(e) {
        if (e.buttons !== 1) return; // left button is not pushed yet
        penTool(e);
    }

    function penTool(e) {
        const {x, y} = c.getBoundingClientRect();
        const newX = e.clientX - x;
        const newY = e.clientY - y;

        ctx.beginPath();
        ctx.lineWidth = 5;
        ctx.moveTo(lastX, lastY);
        ctx.lineTo(newX, newY);
        ctx.strokeStyle = 'white';
        ctx.stroke();
        ctx.closePath();

        lastX = newX;
        lastY = newY;
    }

    let lastX = 0;
    let lastY = 0;  
</script>

</body>
</html>

Android: How to handle right to left swipe gestures

Here is simple Android Code for detecting gesture direction

In MainActivity.java and activity_main.xml, write the following code:

MainActivity.java

import java.util.ArrayList;

import android.app.Activity;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.GestureStroke;
import android.gesture.Prediction;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity implements
        OnGesturePerformedListener {

    GestureOverlayView gesture;
    GestureLibrary lib;
    ArrayList<Prediction> prediction;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lib = GestureLibraries.fromRawResource(MainActivity.this,
                R.id.gestureOverlayView1);
        gesture = (GestureOverlayView) findViewById(R.id.gestureOverlayView1);
        gesture.addOnGesturePerformedListener(this);
    }

    @Override
    public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
        ArrayList<GestureStroke> strokeList = gesture.getStrokes();
        // prediction = lib.recognize(gesture);
        float f[] = strokeList.get(0).points;
        String str = "";

        if (f[0] < f[f.length - 2]) {
            str = "Right gesture";
        } else if (f[0] > f[f.length - 2]) {
            str = "Left gesture";
        } else {
            str = "no direction";
        }
        Toast.makeText(getApplicationContext(), str, Toast.LENGTH_LONG).show();

    }

}

activity_main.xml

<android.gesture.GestureOverlayView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:android1="http://schemas.android.com/apk/res/android"
    xmlns:android2="http://schemas.android.com/apk/res/android"
    android:id="@+id/gestureOverlayView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android1:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Draw gesture"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</android.gesture.GestureOverlayView>

Long press on UITableView

Answer in Swift:

Add delegate UIGestureRecognizerDelegate to your UITableViewController.

Within UITableViewController:

override func viewDidLoad() {
    super.viewDidLoad()

    let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: "handleLongPress:")
    longPressGesture.minimumPressDuration = 1.0 // 1 second press
    longPressGesture.delegate = self
    self.tableView.addGestureRecognizer(longPressGesture)

}

And the function:

func handleLongPress(longPressGesture:UILongPressGestureRecognizer) {

    let p = longPressGesture.locationInView(self.tableView)
    let indexPath = self.tableView.indexPathForRowAtPoint(p)

    if indexPath == nil {
        print("Long press on table view, not row.")
    }
    else if (longPressGesture.state == UIGestureRecognizerState.Began) {
        print("Long press on row, at \(indexPath!.row)")
    }

}

How to simulate a touch event in Android?

When using Monkey Script I noticed that DispatchPress(KEYCODE_BACK) is doing nothing which really suck. In many cases this is due to the fact that the Activity doesn't consume the Key event. The solution to this problem is to use a mix of monkey script and adb shell input command in a sequence.

1 Using monkey script gave some great timing control. Wait a certain amount of second for the activity and is a blocking adb call.
2 Finally sending adb shell input keyevent 4 will end the running APK.

adb shell monkey -p com.my.application -v -v -v -f /sdcard/monkey_script.txt 1
adb shell input keyevent 4

Using Excel as front end to Access database (with VBA)

To connect Excel to Access using VBA is very useful I use it in my profession everyday. The connection string I use is according to the program found in the link below. The program can be automated to do multiple connections or tasks in on shot but the basic connection code looks the same. Good luck!

http://vbaexcel.eu/vba-macro-code/database-connection-retrieve-data-from-database-querying-data-into-excel-using-vba-dao

Can anyone recommend a simple Java web-app framework?

Try Apache Click

It is like Wicket, but much more productive and easy to learn.

Sql query to insert datetime in SQL Server

Management studio creates scripts like:

insert table1 (foodate) values(CAST(N'2012-06-18 10:34:09.000' AS DateTime))

How to encrypt and decrypt file in Android?

Use a CipherOutputStream or CipherInputStream with a Cipher and your FileInputStream / FileOutputStream.

I would suggest something like Cipher.getInstance("AES/CBC/PKCS5Padding") for creating the Cipher class. CBC mode is secure and does not have the vulnerabilities of ECB mode for non-random plaintexts. It should be present in any generic cryptographic library, ensuring high compatibility.

Don't forget to use a Initialization Vector (IV) generated by a secure random generator if you want to encrypt multiple files with the same key. You can prefix the plain IV at the start of the ciphertext. It is always exactly one block (16 bytes) in size.

If you want to use a password, please make sure you do use a good key derivation mechanism (look up password based encryption or password based key derivation). PBKDF2 is the most commonly used Password Based Key Derivation scheme and it is present in most Java runtimes, including Android. Note that SHA-1 is a bit outdated hash function, but it should be fine in PBKDF2, and does currently present the most compatible option.

Always specify the character encoding when encoding/decoding strings, or you'll be in trouble when the platform encoding differs from the previous one. In other words, don't use String.getBytes() but use String.getBytes(StandardCharsets.UTF_8).

To make it more secure, please add cryptographic integrity and authenticity by adding a secure checksum (MAC or HMAC) over the ciphertext and IV, preferably using a different key. Without an authentication tag the ciphertext may be changed in such a way that the change cannot be detected.

Be warned that CipherInputStream may not report BadPaddingException, this includes BadPaddingException generated for authenticated ciphers such as GCM. This would make the streams incompatible and insecure for these kind of authenticated ciphers.

ImportError: No module named model_selection

I guess you have the wrong version of scikit-learn, a similar situation was described here on GitHub. Previously (before v0.18), train_test_split was located in the cross_validation module:

from sklearn.cross_validation import train_test_split

However, now it's in the model_selection module:

from sklearn.model_selection import train_test_split

so you'll need the newest version.

To upgrade to at least version 0.18, do:

pip install -U scikit-learn

(Or pip3, depending on your version of Python). If you've installed it in a different way, make sure you use another method to update, for example when using Anaconda.

'Java' is not recognized as an internal or external command

In case you are using a laptop and do not have the Pause\Break button. For windows 10 users with 20h2 and above:

1 WIN ? type "About your PC" ? scroll at the bottom ? Advanced system settings ? Environment variables or WIN+R ? shell:::{bb06c0e4-d293-4f75-8a90-cb05b6477eee} to open Classic System Properties ? on the left side ? Advanced system settings ? Environment variables

Also for Windows 10 and Windows 7:

1 WIN ? This PC ? properties ? Advanced system settings ? Environment variables

In the System variables section click on New…
In Variable name write: JAVA_HOME
In Variable value write: C:\Program Files\Java\jdk-15.0.2\bin, press OK

I have taken steps 2-4 from Vijay Bhatt

There is a bit faster way to set a system variable. Run a console (terminal) as an administrator.

General command synax to add a new variable:

setx variableName value /M

In our example, we would need to set it as

setx JAVA_HOME "C:\Program Files\Java\jdk-15.0.2\bin" /M`

Like this:

/M - flag specifies to set the variable in the system environment. After command execution, you should see the message: SUCCESS: Specified value was saved.

How can I check that it is added?

Close your active terminal;
Open your favorite terminal;
Type java -version.

You should see something similar to this:

Notice: User variables can be created w/o having a root (administrator privileges), whereas to create System variable; You need to open a console as a root.

I have used C:\Program Files\Java\jdk-15.0.2\bin as an example, in your case, it could be different from mine.

How to modify a global variable within a function in bash?

You can always use an alias:

alias next='printf "blah_%02d" $count;count=$((count+1))'

How do I load a file into the python console?

Open command prompt in the folder in which you files to be imported are present. when you type 'python', python terminal will be opened. Now you can use

import script_name

Note: no .py extension to be used while importing.
How can I open a cmd window in a specific location?

Presenting a UIAlertController properly on an iPad using iOS 8

Swift 4 and above

I have created an extension

extension UIViewController {
  public func addActionSheetForiPad(actionSheet: UIAlertController) {
    if let popoverPresentationController = actionSheet.popoverPresentationController {
      popoverPresentationController.sourceView = self.view
      popoverPresentationController.sourceRect = CGRect(x: self.view.bounds.midX, y: self.view.bounds.midY, width: 0, height: 0)
      popoverPresentationController.permittedArrowDirections = []
    }
  }
}

How to use:

let actionSheetVC = UIAlertController(title: "Title", message: nil, preferredStyle: .actionSheet)
addActionSheetForIpad(actionSheet: actionSheetVC)
present(actionSheetVC, animated: true, completion: nil)

Firefox 'Cross-Origin Request Blocked' despite headers

I faced similar problem, and I think is valid to be registered how I fixed it:

I have a system built basically over Symfony 3. For self learn and performance purposes I decided to write few scripts using GoLang, also, an API with public access.

My Go API expects Json format params, and also return Json format response

To call those GoApi's I am using, most, $.ajax ( jQuery ) The first test was a deception: the (un)famous "Cross-Origin Request Blocked" pop up ! Then, I tried to set the "Access-Control-Allow-Origin: *" On apache conf, htaccess, php, javascript and anywhere I could find on google !

But, even, same frustrating error !!!

The Solution was simple : I had to make "POST" requests instead "GET" .

To achieve that I had to adjust both, GoLang and JavaScript to use GET ! Once it done, no more Cross-Origin Request Blocked for me !!!

Hope it Helps

PS:

I am using apache and Vhost, on Directory Block I have

  Header always set Access-Control-Allow-Origin "*"
  Header always set Access-Control-Allow-Methods "POST, GET, OPTIONS, DELETE, PUT"

Remember : "*" means that you will accept requests from anyone !!! (Which may be a security lack ) In my case it is ok, because it will be an public API

PS2: My Headers

Response headers

Access-Control-Allow-Credentials    true
Access-Control-Allow-Headers    Authorization
Access-Control-Allow-Methods    GET, POST, PUT
Access-Control-Allow-Origin http://localhost
Content-Length  164
Content-Type    application/json; charset=UTF-8
Date    Tue, 07 May 2019 20:33:52 GMT

Request headers (469 B)

Accept  application/json, text/javascript, */*; q=0.01
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Connection  keep-alive
Content-Length  81
Content-Type    application/x-www-form-urlencoded; charset=UTF-8
Host    localhost:9003
Origin  http://localhost
Referer http://localhost/fibootkt/MY_app_dev.php/MyTest/GoAPI
User-Agent  Mozilla/5.0 (Macintosh; Intel …) Gecko/20100101 Firefox/66.0

What does this expression language ${pageContext.request.contextPath} exactly do in JSP EL?

For my project's setup, "${pageContext.request.contextPath}"= refers to "src/main/webapp". Another way to tell is by right clicking on your project in Eclipse and then going to Properties:

How to programmatically set the ForeColor of a label to its default?

The default (when created with the designer) is:

label.ForeColor = SystemColors.ControlText;

This should respect the system color settings (e.g. these "high contrast" schemes for visual impaired).

Tracking Google Analytics Page Views with AngularJS

If you're using ng-view in your Angular app you can listen for the $viewContentLoaded event and push a tracking event to Google Analytics.

Assuming you've set up your tracking code in your main index.html file with a name of var _gaq and MyCtrl is what you've defined in the ng-controller directive.

function MyCtrl($scope, $location, $window) {
  $scope.$on('$viewContentLoaded', function(event) {
    $window._gaq.push(['_trackPageView', $location.url()]);
  });
}

UPDATE: for new version of google-analytics use this one

function MyCtrl($scope, $location, $window) {
  $scope.$on('$viewContentLoaded', function(event) {
    $window.ga('send', 'pageview', { page: $location.url() });
  });
}

I want to vertical-align text in select box

I found that only adding padding-top pushed down the grey dropdown arrow box on the right, which was undesirable.

The method that worked for me was to go into the inspector and incrementally add padding until the text was centered. This will also reduce the size of the dropdown icon, but it will be centered as well so it isn't as visually disturbing.

How do I detect if Python is running as a 64-bit application?

While it may work on some platforms, be aware that platform.architecture is not always a reliable way to determine whether python is running in 32-bit or 64-bit. In particular, on some OS X multi-architecture builds, the same executable file may be capable of running in either mode, as the example below demonstrates. The quickest safe multi-platform approach is to test sys.maxsize on Python 2.6, 2.7, Python 3.x.

$ arch -i386 /usr/local/bin/python2.7
Python 2.7.9 (v2.7.9:648dcafa7e5f, Dec 10 2014, 10:10:46)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform, sys
>>> platform.architecture(), sys.maxsize
(('64bit', ''), 2147483647)
>>> ^D
$ arch -x86_64 /usr/local/bin/python2.7
Python 2.7.9 (v2.7.9:648dcafa7e5f, Dec 10 2014, 10:10:46)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform, sys
>>> platform.architecture(), sys.maxsize
(('64bit', ''), 9223372036854775807)

How to remove frame from matplotlib (pyplot.figure vs matplotlib.figure ) (frameon=False Problematic in matplotlib)

To remove the frame of the chart

for spine in plt.gca().spines.values():
  spine.set_visible(False)

I hope this could work

Command to close an application of console?

By close, do you mean you want the current instance of the console app to close, or do you want the application process, to terminate? Missed that all important exit code:

Environment.Exit(0);

Or to close the current instance of the form:

this.Close();

Useful link.

Split function equivalent in T-SQL?

DECLARE
    @InputString NVARCHAR(MAX) = 'token1,token2,token3,token4,token5'
    , @delimiter varchar(10) = ','

DECLARE @xml AS XML = CAST(('<X>'+REPLACE(@InputString,@delimiter ,'</X><X>')+'</X>') AS XML)
SELECT C.value('.', 'varchar(10)') AS value
FROM @xml.nodes('X') as X(C)

Source of this response: http://sqlhint.com/sqlserver/how-to/best-split-function-tsql-delimited

error code 1292 incorrect date value mysql

With mysql 5.7, date value like 0000-00-00 00:00:00 is not allowed.

If you want to allow it, you have to update your my.cnf like:

sudo nano /etc/mysql/my.cnf

find

[mysqld]

Add after:

sql_mode="NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

Restart mysql service:

sudo service mysql restart

Done!

Correctly determine if date string is a valid date in that format

How about this one?

We simply use a try-catch block.

$dateTime = 'an invalid datetime';

try {
    $dateTimeObject = new DateTime($dateTime);
} catch (Exception $exc) {
    echo 'Do something with an invalid DateTime';
}

This approach is not limited to only one date/time format, and you don't need to define any function.

How to smooth a curve in the right way?

I prefer a Savitzky-Golay filter. It uses least squares to regress a small window of your data onto a polynomial, then uses the polynomial to estimate the point in the center of the window. Finally the window is shifted forward by one data point and the process repeats. This continues until every point has been optimally adjusted relative to its neighbors. It works great even with noisy samples from non-periodic and non-linear sources.

Here is a thorough cookbook example. See my code below to get an idea of how easy it is to use. Note: I left out the code for defining the savitzky_golay() function because you can literally copy/paste it from the cookbook example I linked above.

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0,2*np.pi,100)
y = np.sin(x) + np.random.random(100) * 0.2
yhat = savitzky_golay(y, 51, 3) # window size 51, polynomial order 3

plt.plot(x,y)
plt.plot(x,yhat, color='red')
plt.show()

optimally smoothing a noisy sinusoid

UPDATE: It has come to my attention that the cookbook example I linked to has been taken down. Fortunately, the Savitzky-Golay filter has been incorporated into the SciPy library, as pointed out by @dodohjk. To adapt the above code by using SciPy source, type:

from scipy.signal import savgol_filter
yhat = savgol_filter(y, 51, 3) # window size 51, polynomial order 3

What are POD types in C++?

Plain Old Data

In short, it is all built-in data types (e.g. int, char, float, long, unsigned char, double, etc.) and all aggregation of POD data. Yes, it's a recursive definition. ;)

To be more clear, a POD is what we call "a struct": a unit or a group of units that just store data.

C++ convert hex string to signed integer

I had the same problem today, here's how I solved it so I could keep lexical_cast<>

typedef unsigned int    uint32;
typedef signed int      int32;

class uint32_from_hex   // For use with boost::lexical_cast
{
    uint32 value;
public:
    operator uint32() const { return value; }
    friend std::istream& operator>>( std::istream& in, uint32_from_hex& outValue )
    {
        in >> std::hex >> outValue.value;
    }
};

class int32_from_hex   // For use with boost::lexical_cast
{
    uint32 value;
public:
    operator int32() const { return static_cast<int32>( value ); }
    friend std::istream& operator>>( std::istream& in, int32_from_hex& outValue )
    {
        in >> std::hex >> outvalue.value;
    }
};

uint32 material0 = lexical_cast<uint32_from_hex>( "0x4ad" );
uint32 material1 = lexical_cast<uint32_from_hex>( "4ad" );
uint32 material2 = lexical_cast<uint32>( "1197" );

int32 materialX = lexical_cast<int32_from_hex>( "0xfffefffe" );
int32 materialY = lexical_cast<int32_from_hex>( "fffefffe" );
// etc...

(Found this page when I was looking for a less sucky way :-)

Cheers, A.

How to merge two files line by line in Bash

Check

man paste

possible followed by some command like untabify or tabs2spaces

Docker command can't connect to Docker daemon

Had the same issue and what worked for me was:
Checking the ownership of /var/run/docker.sock

ls -l /var/run/docker.sock

If you're not the owner then change ownership with the command

sudo chown *your-username* /var/run/docker.sock

Then you can go ahead and try executing the docker commands hassle-free :D

Best way to test for a variable's existence in PHP; isset() is clearly broken

I don't agree with your reasoning about NULL, and saying that you need to change your mindset about NULL is just weird.

I think isset() was not designed correctly, isset() should tell you if the variable has been set and it should not be concerned with the actual value of the variable.

What if you are checking values returned from a database and one of the columns have a NULL value, you still want to know if it exists even if the value is NULL...nope dont trust isset() here.

likewise

$a = array ('test' => 1, 'hello' => NULL);

var_dump(isset($a['test']));   // TRUE
var_dump(isset($a['foo']));    // FALSE
var_dump(isset($a['hello']));  // FALSE

isset() should have been designed to work like this:

if(isset($var) && $var===NULL){....

this way we leave it up to the programmer to check types and not leave it up to isset() to assume its not there because the value is NULL - its just stupid design

jQuery OR Selector?

If you're looking to use the standard construct of element = element1 || element2 where JavaScript will return the first one that is truthy, you could do exactly that:

element = $('#someParentElement .somethingToBeFound') || $('#someParentElement .somethingElseToBeFound');

which would return the first element that is actually found. But a better way would probably be to use the jQuery selector comma construct (which returns an array of found elements) in this fashion:

element = $('#someParentElement').find('.somethingToBeFound, .somethingElseToBeFound')[0];

which will return the first found element.

I use that from time to time to find either an active element in a list or some default element if there is no active element. For example:

element = $('ul#someList').find('li.active, li:first')[0]

which will return any li with a class of active or, should there be none, will just return the last li.

Either will work. There are potential performance penalties, though, as the || will stop processing as soon as it finds something truthy whereas the array approach will try to find all elements even if it has found one already. Then again, using the || construct could potentially have performance issues if it has to go through several selectors before finding the one it will return, because it has to call the main jQuery object for each one (I really don't know if this is a performance hit or not, it just seems logical that it could be). In general, though, I use the array approach when the selector is a rather long string.

JavaScript Editor Plugin for Eclipse

Complete the following steps in Eclipse to get plugins for JavaScript files:

Open Eclipse -> Go to "Help" -> "Install New Software"
Select the repository for your version of Eclipse. I have Juno so I selected http://download.eclipse.org/releases/juno
Expand "Programming Languages" -> Check the box next to "JavaScript Development Tools"
Click "Next" -> "Next" -> Accept the Terms of the License Agreement -> "Finish"
Wait for the software to install, then restart Eclipse (by clicking "Yes" button at pop up window)
Once Eclipse has restarted, open "Window" -> "Preferences" -> Expand "General" and "Editors" -> Click "File Associations" -> Add ".js" to the "File types:" list, if it is not already there
In the same "File Associations" dialog, click "Add" in the "Associated editors:" section
Select "Internal editors" radio at the top
Select "JavaScript Viewer". Click "OK" -> "OK"

To add JavaScript Perspective: (Optional)
10. Go to "Window" -> "Open Perspective" -> "Other..."
11. Select "JavaScript". Click "OK"

To open .html or .js file with highlighted JavaScript syntax:
12. (Optional) Select JavaScript Perspective
13. Browse and Select .html or .js file in Script Explorer in [JavaScript Perspective] (Or Package Explorer [Java Perspective] Or PyDev Package Explorer [PyDev Perspective] Don't matter.)
14. Right-click on .html or .js file -> "Open With" -> "Other..."
15. Select "Internal editors"
16. Select "Java Script Editor". Click "OK" (see JavaScript syntax is now highlighted )

node.js string.replace doesn't work?

According to the Javascript standard, String.replace isn't supposed to modify the string itself. It just returns the modified string. You can refer to the Mozilla Developer Network documentation for more info.

You can always just set the string to the modified value:

variableABC = variableABC.replace('B', 'D')

Edit: The code given above is to only replace the first occurrence.

To replace all occurrences, you could do:

 variableABC = variableABC.replace(/B/g, "D");

To replace all occurrences and ignore casing

 variableABC = variableABC.replace(/B/gi, "D");

BootStrap : Uncaught TypeError: $(...).datetimepicker is not a function

You are using datetimepicker when it should be datepicker. As per the docs. Try this and it should work.

<script type="text/javascript">
  $(function () {
    $('#datetimepicker9').datepicker({
      viewMode: 'years'
    });
  });
 </script>

Change MySQL root password in phpMyAdmin

You can change the mysql root password by logging in to the database directly (mysql -h your_host -u root) then run

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

Blade if(isset) is not working Laravel

You can use the ternary operator easily:

{{ $usersType ? $usersType : '' }}

How to fix HTTP 404 on Github Pages?

For some reason, the deployment of the GitHub pages stopped working today (2020-may-05). Previously I did not have any html, only md files. I tried to create an index.html and it published the page immediately. After removal of index.html, the publication keeps working.

Detecting input change in jQuery?

As others already suggested, the solution in your case is to sniff multiple events.
Plugins doing this job often listen for the following events:

$input.on('change keydown keypress keyup mousedown click mouseup', handler);

If you think it may fit, you can add focus, blur and other events too.
I suggest not to exceed in the events to listen, as it loads in the browser memory further procedures to execute according to the user's behaviour.

Attention: note that changing the value of an input element with JavaScript (e.g. through the jQuery .val() method) won't fire any of the events above.
(Reference: https://api.jquery.com/change/).

PHP using Gettext inside <<<EOF string

As far as I can see, you just added heredoc by mistake
No need to use ugly heredoc syntax here.
Just remove it and everything will work:

<p>Hello</p>
<p><?= _("World"); ?></p>

How do I print a double value without scientific notation using Java?

I think everyone had the right idea, but all answers were not straightforward. I can see this being a very useful piece of code. Here is a snippet of what will work:

System.out.println(String.format("%.8f", EnterYourDoubleVariableHere));

the ".8" is where you set the number of decimal places you would like to show.

I am using Eclipse and it worked no problem.

Hope this was helpful. I would appreciate any feedback!

Select All as default value for Multivalue parameter

Does not work if you have nulls.

You can get around this by modifying your select statement to plop something into nulls:

phonenumber = CASE
  WHEN (isnull(phonenumber, '')='') THEN '(blank)'
  ELSE phonenumber
END

Java Webservice Client (Best way)

What is the best approach to do this JAVA?

I would personally NOT use Axis 2, even for client side development only. Here is why I stay away from it:

I don't like its architecture and hate its counter productive deployment model.
I find it to be low quality project.
I don't like its performances (see this benchmark against JAX-WS RI).
It's always a nightmare to setup dependencies (I use Maven and I always have to fight with the gazillion of dependencies) (see #2)
Axis sucked big time and Axis2 isn't better. No, this is not a personal opinion, there is a consensus.
I suffered once, never again.

The only reason Axis is still around is IMO because it's used in Eclipse since ages. Thanks god, this has been fixed in Eclipse Helios and I hope Axis2 will finally die. There are just much better stacks.

I read about SAAJ, looks like that will be more granular level of approach?

To do what?

Is there any other way than using the WSDL2Java tool, to generate the code. Maybe wsimport in another option. What are the pros and cons?

Yes! Prefer a JAX-WS stack like CXF or JAX-WS RI (you might also read about Metro, Metro = JAX-WS RI + WSIT), they are just more elegant, simpler, easier to use. In your case, I would just use JAX-WS RI which is included in Java 6 and thus wsimport.

Can someone send the links for some good tutorials on these topics?

That's another pro, there are plenty of (good quality) tutorials for JAX-WS, see for example:

Developing JAX-WS Web Service Clients (start here)
Introducing JAX-WS 2.0 With the Java SE 6 Platform, Part 1
Creating a Simple Web Service and Client with JAX-WS
Creating a SOAP client with either Apache CXF or GlassFish Metro (Glen Mazza's blog is a great resources)

What are the options we need to use while generating the code using the WSDL2Java?

No options, use wsimport :)

Add views below toolbar in CoordinatorLayout

Take the attribute

app:layout_behavior="@string/appbar_scrolling_view_behavior"

off the RecyclerView and put it on the FrameLayout that you are trying to show under the Toolbar.

I've found that one important thing the scrolling view behavior does is to layout the component below the toolbar. Because the FrameLayout has a descendant that will scroll (RecyclerView), the CoordinatorLayout will get those scrolling events for moving the Toolbar.

One other thing to be aware of: That layout behavior will cause the FrameLayout height to be sized as if the Toolbar is already scrolled, and with the Toolbar fully displayed the entire view is simply pushed down so that the bottom of the view is below the bottom of the CoordinatorLayout.

This was a surprise to me. I was expecting the view to be dynamically resized as the toolbar is scrolled up and down. So if you have a scrolling component with a fixed component at the bottom of your view, you won't see that bottom component until you have fully scrolled the Toolbar.

So when I wanted to anchor a button at the bottom of the UI, I worked around this by putting the button at the bottom of the CoordinatorLayout (android:layout_gravity="bottom") and adding a bottom margin equal to the button's height to the view beneath the toolbar.

How to clean project cache in Intellij idea like Eclipse's clean?

1) File -> Invalide Caches (in IDE IDEA)

2) Manually, got to C:\Users\\AppData\Local\JetBrains\IntelliJ IDEA \system\caches and delete

JetBrains: https://intellij-support.jetbrains.com/hc/en-us/articles/206544519-Directories-used-by-the-IDE-to-store-settings-caches-plugins-and-logs

Get bytes from std::string in C++

Normally, encryption functions take

encrypt(const void *ptr, size_t bufferSize);

as arguments. You can pass c_str and length directly:

encrypt(strng.c_str(), strng.length());

This way, extra space is allocated or wasted.

How to use filter, map, and reduce in Python 3

from functools import reduce

def f(x):
    return x % 2 != 0 and x % 3 != 0

print(*filter(f, range(2, 25)))
#[5, 7, 11, 13, 17, 19, 23]

def cube(x):
    return x**3
print(*map(cube, range(1, 11)))
#[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000]

def add(x,y):
    return x+y

reduce(add, range(1, 11))
#55

It works as is. To get the output of map use * or list

How to stop execution after a certain time in Java?

Depends on what the while loop is doing. If there is a chance that it will block for a long time, use TimerTask to schedule a task to set a stopExecution flag, and also .interrupt() your thread.

With just a time condition in the loop, it could sit there forever waiting for input or a lock (then again, may not be a problem for you).

load Js file in HTML

If this is your detail.html I don't see where do you load detail.js? Maybe this

<script src="js/index.js"></script>

should be this

<script src="js/detail.js"></script>

What is the preferred Bash shebang?

/bin/sh is usually a link to the system's default shell, which is often bash but on, e.g., Debian systems is the lighter weight dash. Either way, the original Bourne shell is sh, so if your script uses some bash (2nd generation, "Bourne Again sh") specific features ([[ ]] tests, arrays, various sugary things, etc.), then you should be more specific and use the later. This way, on systems where bash is not installed, your script won't run. I understand there may be an exciting trilogy of films about this evolution...but that could be hearsay.

Also note that when evoked as sh, bash to some extent behaves as POSIX standard sh (see also the GNU docs about this).

How to declare a global variable in php?

If the variable is not going to change you could use define

Example:

define('FOOTER_CONTENT', 'Hello I\'m an awesome footer!');

function footer()
{
    echo FOOTER_CONTENT;
}

How to compile a Perl script to a Windows executable with Strawberry Perl?

  :: short answer :
  :: perl -MCPAN -e "install PAR::Packer" 
  pp -o <<DesiredExeName>>.exe <<MyFancyPerlScript>> 

  :: long answer - create the following cmd , adjust vars to your taste ...
  :: next_line_is_templatized
  :: file:compile-morphus.1.2.3.dev.ysg.cmd v1.0.0
  :: disable the echo
  @echo off

  :: this is part of the name of the file - not used
  set _Action=run

  :: the name of the Product next_line_is_templatized
  set _ProductName=morphus

  :: the version of the current Product next_line_is_templatized
  set _ProductVersion=1.2.3

  :: could be dev , test , dev , prod next_line_is_templatized
  set _ProductType=dev

  :: who owns this Product / environment next_line_is_templatized
  set _ProductOwner=ysg

  :: identifies an instance of the tool ( new instance for this version could be created by simply changing the owner )   
  set _EnvironmentName=%_ProductName%.%_ProductVersion%.%_ProductType%.%_ProductOwner%

  :: go the run dir
  cd %~dp0

  :: do 4 times going up
  for /L %%i in (1,1,5) do pushd ..

  :: The BaseDir is 4 dirs up than the run dir
  set _ProductBaseDir=%CD%
  :: debug echo BEFORE _ProductBaseDir is %_ProductBaseDir%
  :: remove the trailing \

  IF %_ProductBaseDir:~-1%==\ SET _ProductBaseDir=%_ProductBaseDir:~0,-1%
  :: debug echo AFTER _ProductBaseDir is %_ProductBaseDir%
  :: debug pause


  :: The version directory of the Product 
  set _ProductVersionDir=%_ProductBaseDir%\%_ProductName%\%_EnvironmentName%

  :: the dir under which all the perl scripts are placed
  set _ProductVersionPerlDir=%_ProductVersionDir%\sfw\perl

  :: The Perl script performing all the tasks
  set _PerlScript=%_ProductVersionPerlDir%\%_Action%_%_ProductName%.pl

  :: where the log events are stored 
  set _RunLog=%_ProductVersionDir%\data\log\compile-%_ProductName%.cmd.log

  :: define a favorite editor 
  set _MyEditor=textpad

  ECHO Check the variables 
  set _
  :: debug PAUSE
  :: truncate the run log
  echo date is %date% time is %time% > %_RunLog%


  :: uncomment this to debug all the vars 
  :: debug set  >> %_RunLog%

  :: for each perl pm and or pl file to check syntax and with output to logs
  for /f %%i in ('dir %_ProductVersionPerlDir%\*.pl /s /b /a-d' ) do echo %%i >> %_RunLog%&perl -wc %%i | tee -a  %_RunLog% 2>&1


  :: for each perl pm and or pl file to check syntax and with output to logs
  for /f %%i in ('dir %_ProductVersionPerlDir%\*.pm /s /b /a-d' ) do echo %%i >> %_RunLog%&perl -wc %%i | tee -a  %_RunLog% 2>&1

  :: now open the run log
  cmd /c start /max %_MyEditor% %_RunLog%


  :: this is the call without debugging
  :: old 
  echo CFPoint1  OK The run cmd script %0 is executed >> %_RunLog%
  echo CFPoint2  OK  compile the exe file  STDOUT and STDERR  to a single _RunLog file >> %_RunLog%
  cd %_ProductVersionPerlDir%

  pp -o %_Action%_%_ProductName%.exe %_PerlScript% | tee -a %_RunLog% 2>&1 

  :: open the run log
  cmd /c start /max %_MyEditor% %_RunLog%

  :: uncomment this line to wait for 5 seconds
  :: ping localhost -n 5

  :: uncomment this line to see what is happening 
  :: PAUSE

  ::
  :::::::
  :: Purpose: 
  :: To compile every *.pl file into *.exe file under a folder 
  :::::::
  :: Requirements : 
  :: perl , pp , win gnu utils tee 
  :: perl -MCPAN -e "install PAR::Packer" 
  :: text editor supporting <<textEditor>> <<FileNameToOpen>> cmd call syntax
  :::::::
  :: VersionHistory
  :: 1.0.0 --- 2012-06-23 12:05:45 --- ysg --- Initial creation from run_morphus.cmd
  :::::::
  :: eof file:compile-morphus.1.2.3.dev.ysg.cmd v1.0.0

How to set Spring profile from system variable?

You can set the spring profile by supplying -Dspring.profiles.active=<env>

For java files in source(src) directory, you can use by System.getProperty("spring.profiles.active")

For java files in test directory you can supply

SPRING_PROFILES_ACTIVE to <env>

Since, "environment", "jvmArgs" and "systemProperties" are ignored for the "test" task. In root build.gradle add a task to set jvm property and environment variable.

test {
    def profile = System.properties["spring.profiles.active"]
    systemProperty "spring.profiles.active",profile
    environment "SPRING.PROFILES_ACTIVE", profile
    println "Running ${project} tests with profile: ${profile}"
}

WPF chart controls

Another one is OxyPlot, which is an open-source cross-platform (WPF, Silverlight, WinForms, Mono) .Net plotting library.

SVN checkout the contents of a folder, not the folder itself

svn co svn://path destination

To specify current directory, use a "." for your destination directory:

svn checkout file:///home/landonwinters/svn/waterproject/trunk .

If statement with String comparison fails

To compare Strings for equality, don't use ==. The == operator checks to see if two objects are exactly the same object:

In Java there are many string comparisons.

String s = "something", t = "maybe something else";
if (s == t)      // Legal, but usually WRONG.
if (s.equals(t)) // RIGHT
if (s > t)    // ILLEGAL
if (s.compareTo(t) > 0) // also CORRECT>

grep from tar.gz without extracting [faster one]

Both the below options work well.

$ zgrep -ai 'CDF_FEED' FeedService.log.1.05-31-2019-150003.tar.gz | more
2019-05-30 19:20:14.568 ERROR 281 --- [http-nio-8007-exec-360] DrupalFeedService  : CDF_FEED_SERVICE::CLASSIFICATION_ERROR:408: Classification failed even after maximum retries for url : abcd.html

$ zcat FeedService.log.1.05-31-2019-150003.tar.gz | grep -ai 'CDF_FEED'
2019-05-30 19:20:14.568 ERROR 281 --- [http-nio-8007-exec-360] DrupalFeedService  : CDF_FEED_SERVICE::CLASSIFICATION_ERROR:408: Classification failed even after maximum retries for url : abcd.html

Get the item doubleclick event of listview

Here is how to get the selected object and object matching code for the double clicked listview item in a WPF listview:

/// <summary>
/// Get the object from the selected listview item.
/// </summary>
/// <param name="LV"></param>
/// <param name="originalSource"></param>
/// <returns></returns>
private object GetListViewItemObject(ListView LV, object originalSource)
{
    DependencyObject dep = (DependencyObject)originalSource;
    while ((dep != null) && !(dep.GetType() == typeof(ListViewItem)))
    {
        dep = VisualTreeHelper.GetParent(dep);
    }
    if (dep == null)
        return null;
    object obj = (Object)LV.ItemContainerGenerator.ItemFromContainer(dep);
    return obj;
}

private void lvFiles_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    object obj = GetListViewItemObject(lvFiles, e.OriginalSource);
    if (obj.GetType() == typeof(MyObject))
    {
        MyObject MyObject = (MyObject)obj;
        // Add the rest of your logic here.
    }
}

Resize a picture to fit a JLabel

You can try it:

ImageIcon imageIcon = new ImageIcon(new ImageIcon("icon.png").getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT));
label.setIcon(imageIcon);

Or in one line:

label.setIcon(new ImageIcon(new ImageIcon("icon.png").getImage().getScaledInstance(20, 20, Image.SCALE_DEFAULT)));

The execution time is much more faster than File and ImageIO.

I recommend you to compare the two solutions in a loop.

Remove spaces from a string in VB.NET

"Spaces" in the original post could refer to whitespace, and no answer yet shows how to remove ALL whitespace from a string. For that regular expressions are the most flexible approach I've found.

Below is a console application where you can see the difference between replacing just spaces or all whitespace.

You can find more about .NET regular expressions at http://msdn.microsoft.com/en-us/library/hs600312.aspx and http://msdn.microsoft.com/en-us/library/az24scfc.aspx

Imports System.Text.RegularExpressions
Module TestRegExp
    Sub Main()
        ' Use to match all whitespace (note the lowercase s matters)
        Dim regWhitespace As New Regex("\s")

        ' Use to match space characters only
        Dim regSpace As New Regex(" ")

        Dim testString As String = "First Line" + vbCrLf + _
        "Second line followed by 2 tabs" + vbTab + vbTab + _
        "End of tabs"

        Console.WriteLine("Test string :")
        Console.WriteLine(testString)

        Console.WriteLine("Replace all whitespace :")
        ' This prints the string on one line with no spacing at all
        Console.WriteLine(regWhitespace.Replace(testString, String.Empty))

        Console.WriteLine("Replace all spaces :")
        ' This removes spaces, but retains the tabs and new lines
        Console.WriteLine(regSpace.Replace(testString, String.Empty))

        Console.WriteLine("Press any key to finish")
        Console.ReadKey()
    End Sub
End Module

DataTable: Hide the Show Entries dropdown but keep the Search box

For DataTables <=1.9, @perpo's answer

$('#example').dataTable({
    "bLengthChange": false
});

works fine, but for 1.10+ try this:

$('#example').dataTable({
    "dom": 'ftipr'
});

where we have left out l the "length changing input control"

1.9 Docs

1.10 Docs

how do I strip white space when grabbing text with jQuery?

str=str.replace(/^\s+|\s+$/g,'');

bash assign default value

The default value parameter expansion is often useful in build scripts like the example one below. If the user just calls the script as-is, perl will not be built in. The user has to explicitly set WITH_PERL to a value other than "no" to have it built in.

$ cat defvar.sh
#!/bin/bash

WITH_PERL=${WITH_PERL:-no}

if [[ "$WITH_PERL" != no ]]; then
    echo "building with perl"
    # ./configure --enable=perl
else
    echo "not building with perl"
    # ./configure
fi

Build without Perl

$ ./defvar.sh
not building with perl

Build with Perl

$ WITH_PERL=yes ./defvar.sh
building with perl

Best way to define error codes/strings in Java?

Please follow the below example:

public enum ErrorCodes {
NO_File("No file found. "),
private ErrorCodes(String value) { 
    this.errordesc = value; 
    }
private String errordesc = ""; 
public String errordesc() {
    return errordesc;
}
public void setValue(String errordesc) {
    this.errordesc = errordesc;
}

};

In your code call it like:

fileResponse.setErrorCode(ErrorCodes.NO_FILE.errordesc());

How make background image on newsletter in outlook?

Background image is not supported in Outlook. You have to use an image and position it behind the text using position relative or absolute.

Which one is the best PDF-API for PHP?

This is just a quick review of how fPDF stands up against tcPDF in the area of performance at each libraries most basic functions.

SPEED TEST

17.0366 seconds to process 2000 PDF files using fPDF || 79.5982 seconds to process 2000 PDF files using tcPDF

FILE SIZE CHECK (in bytes)

788 fPDF || 1,860 tcPDF

The code used was as identical as possible and renders just a clean PDF file with no text. This is also using the latest version of each library as of June 22, 2011.

Pure JavaScript equivalent of jQuery's $.ready() - how to call a function when the page/DOM is ready for it

The good folks at HubSpot have a resource where you can find pure Javascript methodologies for achieving a lot of jQuery goodness - including ready

http://youmightnotneedjquery.com/#ready

function ready(fn) {
  if (document.readyState != 'loading'){
    fn();
  } else if (document.addEventListener) {
    document.addEventListener('DOMContentLoaded', fn);
  } else {
    document.attachEvent('onreadystatechange', function() {
      if (document.readyState != 'loading')
        fn();
    });
  }
}

example inline usage:

ready(function() { alert('hello'); });

Looping through GridView rows and Checking Checkbox Control

Loop like

foreach (GridViewRow row in grid.Rows)
{
   if (((CheckBox)row.FindControl("chkboxid")).Checked)
   {
    //read the label            
   }            
}

here-document gives 'unexpected end of file' error

Please try to remove the preceeding spaces before EOF:-

/var/mail -s "$SUBJECT" "$EMAIL" <<-EOF

Using <tab> instead of <spaces> for ident AND using <<-EOF works fine.

The "-" removes the <tabs>, not <spaces>, but at least this works.

How to determine the version of Gradle?

You can also add the following line to your build script:

println "Running gradle version: $gradle.gradleVersion"

or (it won't be printed with -q switch)

logger.lifecycle "Running gradle version: $gradle.gradleVersion"

Is it possible to use Visual Studio on macOS?

Yes, you can! There's a Visual Studio for macs and there's Visual Studio Code if you only need a text editor like Sublime Text.

Git merge errors

I had the same issue when switching from a dev branch to master branch. What I did was commit my changes and switch to the master branch. You might have uncommitted changes.

Difference between WebStorm and PHPStorm

PhpStorm supports all the features of WebStorm but some are not bundled so you might need to install the corresponding plugin for some framework via Settings > Plugins > Install JetBrains Plugin.

Official comment - jetbrains.com

Parse error: syntax error, unexpected T_ECHO in

Missing ; after var_dump($row)

C# Example of AES256 encryption using System.Security.Cryptography.Aes

Once I'd discovered all the information of how my client was handling the encryption/decryption at their end it was straight forward using the AesManaged example suggested by dtb.

The finally implemented code started like this:

    try
    {
        // Create a new instance of the AesManaged class.  This generates a new key and initialization vector (IV).
        AesManaged myAes = new AesManaged();

        // Override the cipher mode, key and IV
        myAes.Mode = CipherMode.ECB;
        myAes.IV = new byte[16] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; // CRB mode uses an empty IV
        myAes.Key = CipherKey;  // Byte array representing the key
        myAes.Padding = PaddingMode.None;

        // Create a encryption object to perform the stream transform.
        ICryptoTransform encryptor = myAes.CreateEncryptor();

        // TODO: perform the encryption / decryption as required...

    }
    catch (Exception ex)
    {
        // TODO: Log the error 
        throw ex;
    }

MVC4 input field placeholder

Of course it does:

@Html.TextBoxFor(x => x.Email, new { @placeholder = "Email" })

Intel HAXM installation error - This computer does not support Intel Virtualization Technology (VT-x)

Anti-virus software may interfere with the HAXM installation. After trying to figure out what went wrong for a few hours I found a strange solution - uninstalling my anti-virus software , installing HAXM (which worked) and then re-installing the anti-virus software (Avast in my case but it could happen with other anti-virus programs as well.

The full check I went through to get this running is:

Check the 'Virtualization' and vt-X feature in the BIOS.
Verifying Hyper-V is not installed.
Checking weather vt-X is enabled in windows with the Intel tool and MS tool (mentioned in previous posts in this thread).
Disabling the anti-virus which didn't help.
Uninstalling the anti-virus (which solved the problem for me).

Can you explain the HttpURLConnection connection process?

Tim Bray presented a concise step-by-step, stating that openConnection() does not establish an actual connection. Rather, an actual HTTP connection is not established until you call methods such as getInputStream() or getOutputStream().

http://www.tbray.org/ongoing/When/201x/2012/01/17/HttpURLConnection

Can't get private key with openssl (no start line:pem_lib.c:703:Expecting: ANY PRIVATE KEY)

On my execution of openssl pkcs12 -export -out cacert.pkcs12 -in testca/cacert.pem, I received the following message:

unable to load private key 140707250050712:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:701:Expecting: ANY PRIVATE KEY`

Got this solved by providing the key file along with the command. The switch is -inkey inkeyfile.pem

Box shadow for bottom side only

Try using online generator css3.me Change the value and get the code, pretty simple.

Input type "number" won't resize

Use an on onkeypress event. Example for a zip code box. It allows a maximum of 5 characters, and checks to make sure input is only numbers.

Nothing beats a server side validation of course, but this is a nifty way to go.

_x000D_

function validInput(e) {_x000D_
  e = (e) ? e : window.event;_x000D_
  a = document.getElementById('zip-code');_x000D_
  cPress = (e.which) ? e.which : e.keyCode;_x000D_
_x000D_
  if (cPress > 31 && (cPress < 48 || cPress > 57)) {_x000D_
    return false;_x000D_
  } else if (a.value.length >= 5) {_x000D_
    return false;_x000D_
  }_x000D_
_x000D_
  return true;_x000D_
}

_x000D_

#zip-code {_x000D_
  overflow: hidden;_x000D_
  width: 60px;_x000D_
}

_x000D_

<label for="zip-code">Zip Code:</label>_x000D_
<input type="number" id="zip-code" name="zip-code" onkeypress="return validInput(event);" required="required">

_x000D_

Remove multiple whitespaces

simplified to one function:

function removeWhiteSpace($text)
{
    $text = preg_replace('/[\t\n\r\0\x0B]/', '', $text);
    $text = preg_replace('/([\s])\1+/', ' ', $text);
    $text = trim($text);
    return $text;
}

based on Danuel O'Neal answer.

Is there a timeout for idle PostgreSQL connections?

It sounds like you have a connection leak in your application because it fails to close pooled connections. You aren't having issues just with <idle> in transaction sessions, but with too many connections overall.

Killing connections is not the right answer for that, but it's an OK-ish temporary workaround.

Rather than re-starting PostgreSQL to boot all other connections off a PostgreSQL database, see: How do I detach all other users from a postgres database? and How to drop a PostgreSQL database if there are active connections to it? . The latter shows a better query.

For setting timeouts, as @Doon suggested see How to close idle connections in PostgreSQL automatically?, which advises you to use PgBouncer to proxy for PostgreSQL and manage idle connections. This is a very good idea if you have a buggy application that leaks connections anyway; I very strongly recommend configuring PgBouncer.

A TCP keepalive won't do the job here, because the app is still connected and alive, it just shouldn't be.

In PostgreSQL 9.2 and above, you can use the new state_change timestamp column and the state field of pg_stat_activity to implement an idle connection reaper. Have a cron job run something like this:

SELECT pg_terminate_backend(pid)
    FROM pg_stat_activity
    WHERE datname = 'regress'
      AND pid <> pg_backend_pid()
      AND state = 'idle'
      AND state_change < current_timestamp - INTERVAL '5' MINUTE;

In older versions you need to implement complicated schemes that keep track of when the connection went idle. Do not bother; just use pgbouncer.

Insert variable into Header Location PHP

like this?

<?php
$url_endpoint = get_permalink();
$url_endpoint = parse_url( $url_endpoint );
$url_endpoint = $url_endpoint['path'];

header('Location: http://linkhere.com/'. $url_endpoint);

?>

Correct way to write line to file?

Regarding os.linesep:

Here is an exact unedited Python 2.7.1 interpreter session on Windows:

Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.linesep
'\r\n'
>>> f = open('myfile','w')
>>> f.write('hi there\n')
>>> f.write('hi there' + os.linesep) # same result as previous line ?????????
>>> f.close()
>>> open('myfile', 'rb').read()
'hi there\r\nhi there\r\r\n'
>>>

On Windows:

As expected, os.linesep does NOT produce the same outcome as '\n'. There is no way that it could produce the same outcome. 'hi there' + os.linesep is equivalent to 'hi there\r\n', which is NOT equivalent to 'hi there\n'.

It's this simple: use \n which will be translated automatically to os.linesep. And it's been that simple ever since the first port of Python to Windows.

There is no point in using os.linesep on non-Windows systems, and it produces wrong results on Windows.

DO NOT USE os.linesep!

how to change directory using Windows command line

cd /driveName driveName:\pathNamw

What does "javax.naming.NoInitialContextException" mean?

It basically means that the application wants to perform some "naming operations" (e.g. JNDI or LDAP lookups), and it didn't have sufficient information available to be able to create a connection to the directory server. As the docs for the exception state,

This exception is thrown when no initial context implementation can be created. The policy of how an initial context implementation is selected is described in the documentation of the InitialContext class.

And if you dutifully have a look at the javadocs for InitialContext, they describe quite well how the initial context is constructed, and what your options are for supplying the address/credentials/etc.

If you have a go at creating the context and get stuck somewhere else, please post back explaining what you've done so far and where you're running aground.

Remove characters from C# string

var str = "My name @is ,Wan.;'; Wan";
var charsToRemove = new string[] { "@", ",", ".", ";", "'" };
foreach (var c in charsToRemove)
{
    str = str.Replace(c, string.Empty);
}

But I may suggest another approach if you want to remove all non letter characters

var str = "My name @is ,Wan.;'; Wan";
str = new string((from c in str
                  where char.IsWhiteSpace(c) || char.IsLetterOrDigit(c)
                  select c
       ).ToArray());

How do I disable a Pylint warning?

I had this problem using Eclipse and solved it as follows:

In the pylint folder (e.g. C:\Python26\Lib\site-packages\pylint), hold Shift, right-click and choose to open the windows command in that folder. Type:

lint.py --generate-rcfile > standard.rc

This creates the standard.rc configuration file. Open it in Notepad and under [MESSAGES CONTROL], uncomment disable= and add the message ID's you want to disable, e.g.:

disable=W0511, C0321

Save the file, and in Eclipse ? Window ? Preferences ? PyDev ? *pylint, in the arguments box, type:

--rcfile=C:\Python26\Lib\site-packages\pylint\standard.rc

Now it should work...

You can also add a comment at the top of your code that will be interpreted by Pylint:

# pylint: disable=C0321

Pylint message codes.

Adding e.g. --disable-ids=C0321 in the arguments box does not work.

All available Pylint messages are stored in the dictionary _messages, an attribute of an instance of the pylint.utils.MessagesHandlerMixIn class. When running Pylint with the argument --disable-ids=... (at least without a configuration file), this dictionary is initially empty, raising a KeyError exception within Pylint (pylint.utils.MessagesHandlerMixIn.check_message_id().

In Eclipse, you can see this error-message in the Pylint Console (windows* ? show view ? Console, select Pylint console from the console options besides the console icon.)

How to parse JSON without JSON.NET library?

You can use the classes found in the System.Json Namespace which were added in .NET 4.5. You need to add a reference to the System.Runtime.Serialization assembly

The JsonValue.Parse() Method parses JSON text and returns a JsonValue:

JsonValue value = JsonValue.Parse(@"{ ""name"":""Prince Charming"", ...");

If you pass a string with a JSON object, you should be able to cast the value to a JsonObject:

using System.Json;


JsonObject result = value as JsonObject;

Console.WriteLine("Name .... {0}", (string)result["name"]);
Console.WriteLine("Artist .. {0}", (string)result["artist"]);
Console.WriteLine("Genre ... {0}", (string)result["genre"]);
Console.WriteLine("Album ... {0}", (string)result["album"]);

The classes are quite similar to those found in the System.Xml.Linq Namespace.

jQuery .val() vs .attr("value")

I have always used .val() and to be honest I didnt even know you could get the value using .attr("value"). I set the value of a form field using .val() as well ex. $('#myfield').val('New Value');

Address already in use: JVM_Bind

on windows open a cmd.exe window with administrator permissions and use netstat -a -b -o you will get the id of the proccess that holds your port and be able to kill it using task manager.

How do you convert an entire directory with ffmpeg?

For giggles, here's solution in fish-shell:

for i in *.avi; ffmpeg -i "$i" (string split -r -m1 . $i)[1]".mp4"; end

Is there a common Java utility to break a list into batches?

The following example demonstrates chunking of a List:

package de.thomasdarimont.labs;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class SplitIntoChunks {

    public static void main(String[] args) {

        List<Integer> ints = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11);

        List<List<Integer>> chunks = chunk(ints, 4);

        System.out.printf("Ints:   %s%n", ints);
        System.out.printf("Chunks: %s%n", chunks);
    }

    public static <T> List<List<T>> chunk(List<T> input, int chunkSize) {

        int inputSize = input.size();
        int chunkCount = (int) Math.ceil(inputSize / (double) chunkSize);

        Map<Integer, List<T>> map = new HashMap<>(chunkCount);
        List<List<T>> chunks = new ArrayList<>(chunkCount);

        for (int i = 0; i < inputSize; i++) {

            map.computeIfAbsent(i / chunkSize, (ignore) -> {

                List<T> chunk = new ArrayList<>();
                chunks.add(chunk);
                return chunk;

            }).add(input.get(i));
        }

        return chunks;
    }
}

Output:

Ints:   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
Chunks: [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11]]

Android - Package Name convention

http://docs.oracle.com/javase/tutorial/java/package/namingpkgs.html

Companies use their reversed Internet domain name to begin their package names—for example, com.example.mypackage for a package named mypackage created by a programmer at example.com.

Name collisions that occur within a single company need to be handled by convention within that company, perhaps by including the region or the project name after the company name (for example, com.example.region.mypackage).

If you have a company domain www.example.com

Then you should use:

com.example.region.projectname

If you own a domain name like example.co.uk than it should be:

uk.co.example.region.projectname

If you do not own a domain, you should then use your email address:

for [email protected] it should be:

com.example.name.region.projectname

How do I extract part of a string in t-sql

I would recommend a combination of PatIndex and Left. Carefully constructed, you can write a query that always works, no matter what your data looks like.

Ex:

Declare @Temp Table(Data VarChar(20))

Insert Into @Temp Values('BTA200')
Insert Into @Temp Values('BTA50')
Insert Into @Temp Values('BTA030')
Insert Into @Temp Values('BTA')
Insert Into @Temp Values('123')
Insert Into @Temp Values('X999')

Select Data, Left(Data, PatIndex('%[0-9]%', Data + '1') - 1)
From   @Temp

PatIndex will look for the first character that falls in the range of 0-9, and return it's character position, which you can use with the LEFT function to extract the correct data. Note that PatIndex is actually using Data + '1'. This protects us from data where there are no numbers found. If there are no numbers, PatIndex would return 0. In this case, the LEFT function would error because we are using Left(Data, PatIndex - 1). When PatIndex returns 0, we would end up with Left(Data, -1) which returns an error.

There are still ways this can fail. For a full explanation, I encourage you to read:

Extracting numbers with SQL Server

That article shows how to get numbers out of a string. In your case, you want to get alpha characters instead. However, the process is similar enough that you can probably learn something useful out of it.

Error - SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM

That usually means a null is being posted to the query instead of your desired value, you might try to run the SQL Profiler to see exactly what is getting passed to SQL Server from linq.

What is a blob URL and why it is used?

What is blob url? Why it is used?

BLOB is just byte sequence. Browser recognize it as byte stream. It is used to get byte stream from source.

A Blob object represents a file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.

Can i make my own blob url on a server?

Yes you can there are serveral ways to do so for example try http://php.net/manual/en/function.ibase-blob-echo.php

How do I convert from int to String?

Mostly ditto on SimonJ. I really dislike the ""+i idiom. If you say String.valueOf(i), Java converts the integer to a string and returns the result. If you say ""+i, Java creates a StringBuilder object, appends an empty string to it, converts the integer to a string, appends this to the StringBuilder, then converts the StringBuilder to a String. That's a lot of extra steps. I suppose if you do it once in a big program, it's no big deal. But if you're doing this all the time, you're making the computer do a bunch of extra work and creating all these extra objects that then have to be cleaned up. I don't want to get fanatic about micro-optimization, but I don't want to be pointlessly wasteful either.

Adding attribute in jQuery

$('#yourid').prop('disabled', true);

I can't find my git.exe file in my Github folder

I found git here

C:\Users\<User>\AppData\Local\GitHubDesktop\app-0.5.8\resources\app\git\cmd\git.exe

You have to write file name (git.exe) in the end of path otherwise it will give an error=5

Or you can check here also.

C:\Program Files\Git\bin\git.exe

What does AngularJS do better than jQuery?

Data-Binding

You go around making your webpage, and keep on putting {{data bindings}} whenever you feel you would have dynamic data. Angular will then provide you a $scope handler, which you can populate (statically or through calls to the web server).

This is a good understanding of data-binding. I think you've got that down.

DOM Manipulation

For simple DOM manipulation, which doesnot involve data manipulation (eg: color changes on mousehover, hiding/showing elements on click), jQuery or old-school js is sufficient and cleaner. This assumes that the model in angular's mvc is anything that reflects data on the page, and hence, css properties like color, display/hide, etc changes dont affect the model.

I can see your point here about "simple" DOM manipulation being cleaner, but only rarely and it would have to be really "simple". I think DOM manipulation is one the areas, just like data-binding, where Angular really shines. Understanding this will also help you see how Angular considers its views.

I'll start by comparing the Angular way with a vanilla js approach to DOM manipulation. Traditionally, we think of HTML as not "doing" anything and write it as such. So, inline js, like "onclick", etc are bad practice because they put the "doing" in the context of HTML, which doesn't "do". Angular flips that concept on its head. As you're writing your view, you think of HTML as being able to "do" lots of things. This capability is abstracted away in angular directives, but if they already exist or you have written them, you don't have to consider "how" it is done, you just use the power made available to you in this "augmented" HTML that angular allows you to use. This also means that ALL of your view logic is truly contained in the view, not in your javascript files. Again, the reasoning is that the directives written in your javascript files could be considered to be increasing the capability of HTML, so you let the DOM worry about manipulating itself (so to speak). I'll demonstrate with a simple example.

This is the markup we want to use. I gave it an intuitive name.

<div rotate-on-click="45"></div>

First, I'd just like to comment that if we've given our HTML this functionality via a custom Angular Directive, we're already done. That's a breath of fresh air. More on that in a moment.

Implementation with jQuery

live demo here (click).

function rotate(deg, elem) {
  $(elem).css({
    webkitTransform: 'rotate('+deg+'deg)', 
    mozTransform: 'rotate('+deg+'deg)', 
    msTransform: 'rotate('+deg+'deg)', 
    oTransform: 'rotate('+deg+'deg)', 
    transform: 'rotate('+deg+'deg)'    
  });
}

function addRotateOnClick($elems) {
  $elems.each(function(i, elem) {
    var deg = 0;
    $(elem).click(function() {
      deg+= parseInt($(this).attr('rotate-on-click'), 10);
      rotate(deg, this);
    });
  });
}

addRotateOnClick($('[rotate-on-click]'));

Implementation with Angular

live demo here (click).

app.directive('rotateOnClick', function() {
  return {
    restrict: 'A',
    link: function(scope, element, attrs) {
      var deg = 0;
      element.bind('click', function() {
        deg+= parseInt(attrs.rotateOnClick, 10);
        element.css({
          webkitTransform: 'rotate('+deg+'deg)', 
          mozTransform: 'rotate('+deg+'deg)', 
          msTransform: 'rotate('+deg+'deg)', 
          oTransform: 'rotate('+deg+'deg)', 
          transform: 'rotate('+deg+'deg)'    
        });
      });
    }
  };
});

Pretty light, VERY clean and that's just a simple manipulation! In my opinion, the angular approach wins in all regards, especially how the functionality is abstracted away and the dom manipulation is declared in the DOM. The functionality is hooked onto the element via an html attribute, so there is no need to query the DOM via a selector, and we've got two nice closures - one closure for the directive factory where variables are shared across all usages of the directive, and one closure for each usage of the directive in the link function (or compile function).

Two-way data binding and directives for DOM manipulation are only the start of what makes Angular awesome. Angular promotes all code being modular, reusable, and easily testable and also includes a single-page app routing system. It is important to note that jQuery is a library of commonly needed convenience/cross-browser methods, but Angular is a full featured framework for creating single page apps. The angular script actually includes its own "lite" version of jQuery so that some of the most essential methods are available. Therefore, you could argue that using Angular IS using jQuery (lightly), but Angular provides much more "magic" to help you in the process of creating apps.

This is a great post for more related information: How do I “think in AngularJS” if I have a jQuery background?

General differences.

The above points are aimed at the OP's specific concerns. I'll also give an overview of the other important differences. I suggest doing additional reading about each topic as well.

Angular and jQuery can't reasonably be compared.

Angular is a framework, jQuery is a library. Frameworks have their place and libraries have their place. However, there is no question that a good framework has more power in writing an application than a library. That's exactly the point of a framework. You're welcome to write your code in plain JS, or you can add in a library of common functions, or you can add a framework to drastically reduce the code you need to accomplish most things. Therefore, a more appropriate question is:

Why use a framework?

Good frameworks can help architect your code so that it is modular (therefore reusable), DRY, readable, performant and secure. jQuery is not a framework, so it doesn't help in these regards. We've all seen the typical walls of jQuery spaghetti code. This isn't jQuery's fault - it's the fault of developers that don't know how to architect code. However, if the devs did know how to architect code, they would end up writing some kind of minimal "framework" to provide the foundation (achitecture, etc) I discussed a moment ago, or they would add something in. For example, you might add RequireJS to act as part of your framework for writing good code.

Here are some things that modern frameworks are providing:

Templating
Data-binding
routing (single page app)
clean, modular, reusable architecture
security
additional functions/features for convenience

Before I further discuss Angular, I'd like to point out that Angular isn't the only one of its kind. Durandal, for example, is a framework built on top of jQuery, Knockout, and RequireJS. Again, jQuery cannot, by itself, provide what Knockout, RequireJS, and the whole framework built on top them can. It's just not comparable.

If you need to destroy a planet and you have a Death Star, use the Death star.

Angular (revisited).

Building on my previous points about what frameworks provide, I'd like to commend the way that Angular provides them and try to clarify why this is matter of factually superior to jQuery alone.

DOM reference.

In my above example, it is just absolutely unavoidable that jQuery has to hook onto the DOM in order to provide functionality. That means that the view (html) is concerned about functionality (because it is labeled with some kind of identifier - like "image slider") and JavaScript is concerned about providing that functionality. Angular eliminates that concept via abstraction. Properly written code with Angular means that the view is able to declare its own behavior. If I want to display a clock:

<clock></clock>

Done.

Yes, we need to go to JavaScript to make that mean something, but we're doing this in the opposite way of the jQuery approach. Our Angular directive (which is in it's own little world) has "augumented" the html and the html hooks the functionality into itself.

MVW Architecure / Modules / Dependency Injection

Angular gives you a straightforward way to structure your code. View things belong in the view (html), augmented view functionality belongs in directives, other logic (like ajax calls) and functions belong in services, and the connection of services and logic to the view belongs in controllers. There are some other angular components as well that help deal with configuration and modification of services, etc. Any functionality you create is automatically available anywhere you need it via the Injector subsystem which takes care of Dependency Injection throughout the application. When writing an application (module), I break it up into other reusable modules, each with their own reusable components, and then include them in the bigger project. Once you solve a problem with Angular, you've automatically solved it in a way that is useful and structured for reuse in the future and easily included in the next project. A HUGE bonus to all of this is that your code will be much easier to test.

It isn't easy to make things "work" in Angular.

THANK GOODNESS. The aforementioned jQuery spaghetti code resulted from a dev that made something "work" and then moved on. You can write bad Angular code, but it's much more difficult to do so, because Angular will fight you about it. This means that you have to take advantage (at least somewhat) to the clean architecture it provides. In other words, it's harder to write bad code with Angular, but more convenient to write clean code.

Angular is far from perfect. The web development world is always growing and changing and there are new and better ways being put forth to solve problems. Facebook's React and Flux, for example, have some great advantages over Angular, but come with their own drawbacks. Nothing's perfect, but Angular has been and is still awesome for now. Just as jQuery once helped the web world move forward, so has Angular, and so will many to come.

How do I undo 'git add' before commit?

Here's a way to avoid this vexing problem when you start a new project:

Create the main directory for your new project.
Run git init.
Now create a .gitignore file (even if it's empty).
Commit your .gitignore file.

Git makes it really hard to do git reset if you don't have any commits. If you create a tiny initial commit just for the sake of having one, after that you can git add -A and git reset as many times as you want in order to get everything right.

Another advantage of this method is that if you run into line-ending troubles later and need to refresh all your files, it's easy:

Check out that initial commit. This will remove all your files.
Then check out your most recent commit again. This will retrieve fresh copies of your files, using your current line-ending settings.

Verify object attribute value with mockito

If you're using Java 8, you can use Lambda expressions to match.

import java.util.Optional;
import java.util.function.Predicate;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;

public class LambdaMatcher<T> extends BaseMatcher<T>
{
    private final Predicate<T> matcher;
    private final Optional<String> description;

    public LambdaMatcher(Predicate<T> matcher)
    {
        this(matcher, null);
    }

    public LambdaMatcher(Predicate<T> matcher, String description)
    {
        this.matcher = matcher;
        this.description = Optional.ofNullable(description);
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean matches(Object argument)
    {
        return matcher.test((T) argument);
    }

    @Override
    public void describeTo(Description description)
    {
        this.description.ifPresent(description::appendText);
    }
}

Example call

@Test
public void canFindEmployee()
{
    Employee employee = new Employee("John");
    company.addEmployee(employee);

    verify(mockedDal).registerEmployee(argThat(new LambdaMatcher<>(e -> e.getName()
                                                                         .equals(employee.getName()))));
}

More info: http://source.coveo.com/2014/10/01/java8-mockito/

Checking Date format from a string in C#

You can use below IsValidDate():

 public static bool IsValidDate(string value, string[] dateFormats)
    {
        DateTime tempDate;
        bool validDate = DateTime.TryParseExact(value, dateFormats, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, ref tempDate);
        if (validDate)
            return true;
        else
            return false;
    }

And you can pass in the value and date formats. For example:

var data = "02-08-2019";
var dateFormats = {"dd.MM.yyyy", "dd-MM-yyyy", "dd/MM/yyyy"}

if (IsValidDate(data, dateFormats))
{
    //Do something
}
else
{
    //Do something else
}

Python regular expressions return true/false

One way to do this is just to test against the return value. Because you're getting <_sre.SRE_Match object at ...> it means that this will evaluate to true. When the regular expression isn't matched you'll the return value None, which evaluates to false.

import re

if re.search("c", "abcdef"):
    print "hi"

Produces hi as output.

How do I get hour and minutes from NSDate?

Swift 2.0

    let dateNow = NSDate()
    let calendar = NSCalendar.currentCalendar()
    let hour = calendar.component(NSCalendarUnit.Hour, fromDate: dateNow)
    let minute = calendar.component(NSCalendarUnit.Minute, fromDate: dateNow)
    print(String(hour))
    print(String(minute))

Please do take note of the cast to String in the print statement, you can easily assign that value to variables, like this:

var hoursString = String(hour)
var minutesString = String(minute)

Then you can concatenate values like this:

var compoundString = "\(hour):\(minute)"
print(compoundString)

How to print multiple lines of text with Python

I wanted to answer to the following question which is a little bit different than this:

Best way to print messages on multiple lines

He wanted to show lines from repeated characters too. He wanted this output:

----------------------------------------
# Operator Micro-benchmarks
# Run_mode: short
# Num_repeats: 5
# Num_runs: 1000

----------------------------------------

You can create those lines inside f-strings with a multiplication, like this:

run_mode, num_repeats, num_runs = 'short', 5, 1000

s = f"""
{'-'*40}
# Operator Micro-benchmarks
# Run_mode: {run_mode}
# Num_repeats: {num_repeats}
# Num_runs: {num_runs}

{'-'*40}
"""

print(s)

How to use confirm using sweet alert?

_x000D_

document.querySelector('#from1').onsubmit = function(e){_x000D_
_x000D_
 swal({_x000D_
    title: "Are you sure?",_x000D_
    text: "You will not be able to recover this imaginary file!",_x000D_
    type: "warning",_x000D_
    showCancelButton: true,_x000D_
    confirmButtonColor: '#DD6B55',_x000D_
    confirmButtonText: 'Yes, I am sure!',_x000D_
    cancelButtonText: "No, cancel it!",_x000D_
    closeOnConfirm: false,_x000D_
    closeOnCancel: false_x000D_
 },_x000D_
 function(isConfirm){_x000D_
_x000D_
   if (isConfirm.value){_x000D_
     swal("Shortlisted!", "Candidates are successfully shortlisted!", "success");_x000D_
_x000D_
    } else {_x000D_
      swal("Cancelled", "Your imaginary file is safe :)", "error");_x000D_
         e.preventDefault();_x000D_
    }_x000D_
 });_x000D_
};

_x000D_

How to solve privileges issues when restore PostgreSQL Database

Some of the answers have already provided various approaches related to getting rid of the create extension and comment on extensions. For me, the following command line seemed to work and be the simplest approach to solve the problem:

cat /tmp/backup.sql.gz | gunzip - | \
  grep -v -E '(CREATE\ EXTENSION|COMMENT\ ON)' |  \
    psql --set ON_ERROR_STOP=on -U db_user -h localhost my_db

Some notes

The first line is just uncompressing my backup and you may need to adjust accordingly.
The second line is using grep to get rid of offending lines.
the third line is my psql command; you may need to adjust as you normally would use psql for restore.

Android WebView not loading an HTTPS URL

Per correct answer by fargth, follows is a small code sample that might help.

First, create a class that extends WebViewClient and which is set to ignore SSL errors:

// SSL Error Tolerant Web View Client
private class SSLTolerentWebViewClient extends WebViewClient {

            @Override
            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
                handler.proceed(); // Ignore SSL certificate errors
            }

}

Then with your web view object (initiated in the OnCreate() method), set its web view client to be an instance of the override class:

 mWebView.setWebViewClient(
                new SSLTolerentWebViewClient()
        );

Find non-ASCII characters in varchar columns using SQL Server

try something like this:

DECLARE @YourTable table (PK int, col1 varchar(20), col2 varchar(20), col3 varchar(20))
INSERT @YourTable VALUES (1, 'ok','ok','ok')
INSERT @YourTable VALUES (2, 'BA'+char(182)+'D','ok','ok')
INSERT @YourTable VALUES (3, 'ok',char(182)+'BAD','ok')
INSERT @YourTable VALUES (4, 'ok','ok','B'+char(182)+'AD')
INSERT @YourTable VALUES (5, char(182)+'BAD','ok',char(182)+'BAD')
INSERT @YourTable VALUES (6, 'BAD'+char(182),'B'+char(182)+'AD','BAD'+char(182)+char(182)+char(182))

--if you have a Numbers table use that, other wise make one using a CTE
;WITH AllNumbers AS
(   SELECT 1 AS Number
    UNION ALL
    SELECT Number+1
        FROM AllNumbers
        WHERE Number<1000
)
SELECT 
    pk, 'Col1' BadValueColumn, CONVERT(varchar(20),col1) AS BadValue --make the XYZ in convert(varchar(XYZ), ...) the largest value of col1, col2, col3
    FROM @YourTable           y
        INNER JOIN AllNumbers n ON n.Number <= LEN(y.col1)
    WHERE ASCII(SUBSTRING(y.col1, n.Number, 1))<32 OR ASCII(SUBSTRING(y.col1, n.Number, 1))>127
UNION
SELECT 
    pk, 'Col2' BadValueColumn, CONVERT(varchar(20),col2) AS BadValue --make the XYZ in convert(varchar(XYZ), ...) the largest value of col1, col2, col3
    FROM @YourTable           y
        INNER JOIN AllNumbers n ON n.Number <= LEN(y.col2)
    WHERE ASCII(SUBSTRING(y.col2, n.Number, 1))<32 OR ASCII(SUBSTRING(y.col2, n.Number, 1))>127
UNION
SELECT 
    pk, 'Col3' BadValueColumn, CONVERT(varchar(20),col3) AS BadValue --make the XYZ in convert(varchar(XYZ), ...) the largest value of col1, col2, col3
    FROM @YourTable           y
        INNER JOIN AllNumbers n ON n.Number <= LEN(y.col3)
    WHERE ASCII(SUBSTRING(y.col3, n.Number, 1))<32 OR ASCII(SUBSTRING(y.col3, n.Number, 1))>127
order by 1
OPTION (MAXRECURSION 1000)

OUTPUT:

pk          BadValueColumn BadValue
----------- -------------- --------------------
2           Col1           BA¶D
3           Col2           ¶BAD
4           Col3           B¶AD
5           Col1           ¶BAD
5           Col3           ¶BAD
6           Col1           BAD¶
6           Col2           B¶AD
6           Col3           BAD¶¶¶

(8 row(s) affected)

What's the right way to decode a string that has special HTML entities in it?

There's JS function to deal with &#xxxx styled entities:
function at GitHub

// encode(decode) html text into html entity
var decodeHtmlEntity = function(str) {
  return str.replace(/&#(\d+);/g, function(match, dec) {
    return String.fromCharCode(dec);
  });
};

var encodeHtmlEntity = function(str) {
  var buf = [];
  for (var i=str.length-1;i>=0;i--) {
    buf.unshift(['&#', str[i].charCodeAt(), ';'].join(''));
  }
  return buf.join('');
};

var entity = '&#39640;&#32423;&#31243;&#24207;&#35774;&#35745;';
var str = '??????';
console.log(decodeHtmlEntity(entity) === str);
console.log(encodeHtmlEntity(str) === entity);
// output:
// true
// true

How to check variable type at runtime in Go language

It seems that Go have special form of switch dedicate to this (it is called type switch):

func (e *Easy)SetOption(option Option, param interface{}) {

    switch v := param.(type) { 
    default:
        fmt.Printf("unexpected type %T", v)
    case uint64:
        e.code = Code(C.curl_wrapper_easy_setopt_long(e.curl, C.CURLoption(option), C.long(v)))
    case string:
        e.code = Code(C.curl_wrapper_easy_setopt_str(e.curl, C.CURLoption(option), C.CString(v)))
    } 
}

What is the difference between 127.0.0.1 and localhost

Well, by IP is faster.

Basically, when you call by server name, it is converted to original IP.

But it would be difficult to memorize an IP, for this reason the domain name was created.

Personally I use http://localhost instead of http://127.0.0.1 or http://username.

Launch Failed Binary not found Eclipse for C in Windows

How to compress a String in Java?

When you create a String, you can think of it as a list of char's, this means that for each character in your String, you need to support all the possible values of char. From the sun docs

char: The char data type is a single 16-bit Unicode character. It has a minimum value of '\u0000' (or 0) and a maximum value of '\uffff' (or 65,535 inclusive).

If you have a reduced set of characters you want to support you can write a simple compression algorithm, which is analogous to binary->decimal->hex radix converstion. You go from 65,536 (or however many characters your target system supports) to 26 (alphabetical) / 36 (alphanumeric) etc.

I've used this trick a few times, for example encoding timestamps as text (target 36 +, source 10) - just make sure you have plenty of unit tests!

How to create cron job using PHP?

function _cron_exe($schedules) {
        if ($obj->get_option('cronenabledisable') == "yes") {
            // $interval = 1*20;
            $interval = $obj->get_option('cronhowtime');
            if ($obj->get_option('crontiming') == 'minutes') {
                $interval = $interval * 60;
            } else if ($obj->get_option('crontiming') == 'hours') {
                $interval = $interval * 3600;
            } else if ($obj->get_option('crontiming') == 'days') {
                $interval = $interval * 86400;
            }
            $schedules['hourlys'] = array(
                'interval' => $interval,
                'display' => 'cronjob'
            );
            return $schedules;
        }

}

How to count how many values per level in a given factor?

In case I just want to know how many unique factor levels exist in the data, I use:

length(unique(df$factorcolumn))

Excel error HRESULT: 0x800A03EC while trying to get range with cell's name

I have encountered this error code when enumerating names and calling worksheet.get_Range(name). It seems to occur when the name does NOT apply to a range, in my case it is the name of a macro.

How to uninstall downloaded Xcode simulator?

Slightly off topic but could be very useful as it could be the basis for other tasks you might want to do with simulators.

I like to keep my simulator list to a minimum, and since there is no multi-select in the "Devices and Simulators" it is a pain to delete them all.

So I boot all the sims that I want to use then, remove all the simulators that I don't have booted.

Delete all the shutdown simulators:

xcrun simctl list | grep -w "Shutdown"  | grep -o "([-A-Z0-9]*)" | sed 's/[\(\)]//g' | xargs -I uuid xcrun simctl delete  uuid

If you need individual simulators back, just add them back to the list in "Devices and Simulators" with the plus button.

jQuery autohide element after 5 seconds

You can try :

setTimeout(function() {
  $('#successMessage').fadeOut('fast');
}, 30000); // <-- time in milliseconds

If you used this then your div will be hide after 30 sec.I also tried this one and it worked for me.

How to check visibility of software keyboard in Android?

The InputMethodManager has information about the soft keyboard. You get it from an activity via:

((InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE))

You might play around with that to see what it can tell you. You can use it to show or hide the soft input...

How to fix 'Unchecked runtime.lastError: The message port closed before a response was received' chrome issue?

In case you're an extension developer who googled your way here trying to stop causing this error:

The issue isn't CORB (as another answer here states) as blocked CORs manifest as warnings like -

Cross-Origin Read Blocking (CORB) blocked cross-origin response https://www.example.com/example.html with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details.

The issue is most likely a mishandled async response to runtime.sendMessage. As MDN says:

To send an asynchronous response, there are two options:

return true from the event listener. This keeps the sendResponse function valid after the listener returns, so you can call it later.

return a Promise from the event listener, and resolve when you have the response (or reject it in case of an error).

When you send an async response but fail to use either of these mechanisms, the supplied sendResponse argument to sendMessage goes out of scope and the result is exactly as the error message says: your message port (the message-passing apparatus) is closed before the response was received.

Webextension-polyfill authors have already written about it in June 2018.

So bottom line, if you see your extension causing these errors - inspect closely all your onMessage listeners. Some of them probably need to start returning promises ~~(marking them as async should be enough).~~ [Thanks @vdegenne]

Reading column names alone in a csv file

I am just mentioning how to get all the column names from a csv file. I am using pandas library.

First we read the file.

import pandas as pd
file = pd.read_csv('details.csv')

Then, in order to just get all the column names as a list from input file use:-

columns = list(file.head(0))

jQuery: Get the cursor position of text in input without browser specific code?

just came across while browsing, might help you javascript-getting-and-setting-caret-position-in-textarea. You can use it for textbox also.

php - add + 7 days to date format mm dd, YYYY

echo date('d/m/Y', strtotime('+7 days'));

Modify the legend of pandas bar plot

If you need to call plot multiply times, you can also use the "label" argument:

ax = df1.plot(label='df1', y='y_var')
ax = df2.plot(label='df2', y='y_var')

While this is not the case in the OP question, this can be helpful if the DataFrame is in long format and you use groupby before plotting.

How do I round a float upwards to the nearest int in C#?

You can cast to an int provided you are sure it's in the range for an int (Int32.MinValue to Int32.MaxValue).

jQuery Dialog Box

Even I faced similar issues. This is how I was able to solve the same

    $("#lnkDetails").live('click', function (e) {

        //Create dynamic element after the element that raised the event. In my case a <a id="lnkDetails" href="/Attendance/Details/2012-07-01" />
        $(this).after('<div id=\"dialog-confirm\" />');

        //Optional : Load data from an external URL. The attr('href') is the href of the <a> tag.
        $('#dialog-confirm').load($(this).attr('href'));

        //Copied from jQueryUI site . Do we need this?
        $("#dialog:ui-dialog").dialog("destroy");

        //Transform the dynamic DOM element into a dialog
        $('#dialog-confirm').dialog({
            modal: true,
            title: 'Details'
        });

        //Prevent Bubbling up to other elements.
        return false;
    });

Setting width/height as percentage minus pixels

Thanks, i solved mine with your help, tweaking it a little since i want a div 100% width 100% heigth (less height of a bottom bar) and no scroll on body (without hack / hiding scroll bars).

For CSS:

 html{
  width:100%;height:100%;margin:0px;border:0px;padding:0px;
 }
 body{
  position:relative;width:100%;height:100%;margin:0px;border:0px;padding:0px;
 }
 div.adjusted{
  position:absolute;width:auto;height:auto;left:0px;right:0px;top:0px;bottom:36px;margin:0px;border:0px;padding:0px;
 }
 div.the_bottom_bar{
  width:100%;height:31px;margin:0px;border:0px;padding:0px;
}

For HTML:

<body>
<div class="adjusted">
 // My elements that go on dynamic size area
 <div class="the_bottom_bar">
  // My elements that goes on bottom bar (fixed heigh of 31 pixels)
 </div>  
</div>

That did the trick, oh yes i put a value little greatter on div.adjusted for bottom than for bottom bar height, else the vertical scrollbar appears, i adjusted to be the nearest value.

That difference is because one of the elements on dynamic area is adding an extra bottom hole that i do not know how to get rid of... it is a video tag (HTML5), please note i put that video tag with this css (so there is no reason for it to make a bottom hole, but it does):

 video{
  width:100%;height:100%;margin:0px;border:0px;padding:0px;
 }

The objetive: Have a video that takes the 100% of the brower (and resizes dynamically when browser is resized, but without altering the aspect ratio) less a bottom space that i use for a div with some texts, buttons, etc (and validators w3c & css of course).

EDIT: I found the reason, video tag is like text, not a block element, so i fixed it with this css:

 video{
  display:block;width:100%;height:100%;margin:0px;border:0px;padding:0px;
 }

Note the display:block; on video tag.

How do you see recent SVN log entries?

As you've already noticed svn log command ran without any arguments shows all log messages that relate to the URL you specify or to the working copy folder where you run the command.

You can always refine/limit the svn log results:

svn log --limit NUM will show only the first NUM of revisions,
svn log --revision REV1(:REV2) will show the log message for REV1 revision or for REV1 -- REV2 range,
svn log --search will show revisions that match the search pattern you specify (the command is available in Subversion 1.8 and newer client). You can search by
- revision's author (i.e. committers username),
- date when the revision was committed,
- revision comment text (log message),
- list of paths changed in revision.

When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?

While other answers nicely described all differences between C++ casts, I would like to add a short note why you should not use C-style casts (Type) var and Type(var).

For C++ beginners C-style casts look like being the superset operation over C++ casts (static_cast<>(), dynamic_cast<>(), const_cast<>(), reinterpret_cast<>()) and someone could prefer them over the C++ casts. In fact C-style cast is the superset and shorter to write.

The main problem of C-style casts is that they hide developer real intention of the cast. The C-style casts can do virtually all types of casting from normally safe casts done by static_cast<>() and dynamic_cast<>() to potentially dangerous casts like const_cast<>(), where const modifier can be removed so the const variables can be modified and reinterpret_cast<>() that can even reinterpret integer values to pointers.

Here is the sample.

int a=rand(); // Random number.

int* pa1=reinterpret_cast<int*>(a); // OK. Here developer clearly expressed he wanted to do this potentially dangerous operation.

int* pa2=static_cast<int*>(a); // Compiler error.
int* pa3=dynamic_cast<int*>(a); // Compiler error.

int* pa4=(int*) a; // OK. C-style cast can do such cast. The question is if it was intentional or developer just did some typo.

*pa4=5; // Program crashes.

The main reason why C++ casts were added to the language was to allow a developer to clarify his intentions - why he is going to do that cast. By using C-style casts which are perfectly valid in C++ you are making your code less readable and more error prone especially for other developers who didn't create your code. So to make your code more readable and explicit you should always prefer C++ casts over C-style casts.

Here is a short quote from Bjarne Stroustrup's (the author of C++) book The C++ Programming Language 4th edition - page 302.

This C-style cast is far more dangerous than the named conversion operators because the notation is harder to spot in a large program and the kind of conversion intended by the programmer is not explicit.

Vertically aligning a checkbox

_x000D_

Add CSS:_x000D_
_x000D_
_x000D_
li {_x000D_
  display: table-row;_x000D_
 _x000D_
 }_x000D_
li div {_x000D_
   display: table-cell;_x000D_
   vertical-align: middle;_x000D_
_x000D_
  }_x000D_
.check{_x000D_
  width:20px;_x000D_
_x000D_
  }_x000D_
ul{_x000D_
   list-style: none;_x000D_
  }_x000D_

_x000D_

 <ul>_x000D_
       <li>_x000D_
_x000D_
           <div><label for="myid1">Subject1</label></div>_x000D_
            <div class="check"><input type="checkbox" value="1"name="subject" class="subject-list" id="myid1"></div>_x000D_
       </li>_x000D_
       <li>_x000D_
_x000D_
           <div><label for="myid2">Subject2</label></div>_x000D_
              <div class="check" ><input type="checkbox" value="2"  class="subject-list" name="subjct" id="myid2"></div>_x000D_
       </li>_x000D_
   </ul>

_x000D_

What's the most efficient way to test two integer ranges for overlap?

I suppose the question was about the fastest, not the shortest code. The fastest version have to avoid branches, so we can write something like this:

for simple case:

static inline bool check_ov1(int x1, int x2, int y1, int y2){
    // insetead of x1 < y2 && y1 < x2
    return (bool)(((unsigned int)((y1-x2)&(x1-y2))) >> (sizeof(int)*8-1));
};

or, for this case:

static inline bool check_ov2(int x1, int x2, int y1, int y2){
    // insetead of x1 <= y2 && y1 <= x2
    return (bool)((((unsigned int)((x2-y1)|(y2-x1))) >> (sizeof(int)*8-1))^1);
};

Getting IP address of client

As @martin and this answer explained, it is complicated. There is no bullet-proof way of getting the client's ip address.

The best that you can do is to try to parse "X-Forwarded-For" and rely on request.getRemoteAddr();

public static String getClientIpAddress(HttpServletRequest request) {
    String xForwardedForHeader = request.getHeader("X-Forwarded-For");
    if (xForwardedForHeader == null) {
        return request.getRemoteAddr();
    } else {
        // As of https://en.wikipedia.org/wiki/X-Forwarded-For
        // The general format of the field is: X-Forwarded-For: client, proxy1, proxy2 ...
        // we only want the client
        return new StringTokenizer(xForwardedForHeader, ",").nextToken().trim();
    }
}

What are best practices for multi-language database design?

Martin's solution is very similar to mine, however how would you handle a default descriptions when the desired translation isn't found ?

Would that require an IFNULL() and another SELECT statement for each field ?

The default translation would be stored in the same table, where a flag like "isDefault" indicates wether that description is the default description in case none has been found for the current language.

How do I remove diacritics (accents) from a string in .NET?

TL;DR - C# string extension method

I think the best solution to preserve the meaning of the string is to convert the characters instead of stripping them, which is well illustrated in the example crème brûlée to crme brle vs. creme brulee.

I checked out Alexander's comment above and saw the Lucene.Net code is Apache 2.0 licensed, so I've modified the class into a simple string extension method. You can use it like this:

var originalString = "crème brûlée";
var maxLength = originalString.Length; // limit output length as necessary
var foldedString = originalString.FoldToASCII(maxLength); 
// "creme brulee"

The function is too long to post in a StackOverflow answer (~139k characters of 30k allowed lol) so I made a gist and attributed the authors:

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/// <summary>
/// This class converts alphabetic, numeric, and symbolic Unicode characters
/// which are not in the first 127 ASCII characters (the "Basic Latin" Unicode
/// block) into their ASCII equivalents, if one exists.
/// <para/>
/// Characters from the following Unicode blocks are converted; however, only
/// those characters with reasonable ASCII alternatives are converted:
/// 
/// <ul>
///   <item><description>C1 Controls and Latin-1 Supplement: <a href="http://www.unicode.org/charts/PDF/U0080.pdf">http://www.unicode.org/charts/PDF/U0080.pdf</a></description></item>
///   <item><description>Latin Extended-A: <a href="http://www.unicode.org/charts/PDF/U0100.pdf">http://www.unicode.org/charts/PDF/U0100.pdf</a></description></item>
///   <item><description>Latin Extended-B: <a href="http://www.unicode.org/charts/PDF/U0180.pdf">http://www.unicode.org/charts/PDF/U0180.pdf</a></description></item>
///   <item><description>Latin Extended Additional: <a href="http://www.unicode.org/charts/PDF/U1E00.pdf">http://www.unicode.org/charts/PDF/U1E00.pdf</a></description></item>
///   <item><description>Latin Extended-C: <a href="http://www.unicode.org/charts/PDF/U2C60.pdf">http://www.unicode.org/charts/PDF/U2C60.pdf</a></description></item>
///   <item><description>Latin Extended-D: <a href="http://www.unicode.org/charts/PDF/UA720.pdf">http://www.unicode.org/charts/PDF/UA720.pdf</a></description></item>
///   <item><description>IPA Extensions: <a href="http://www.unicode.org/charts/PDF/U0250.pdf">http://www.unicode.org/charts/PDF/U0250.pdf</a></description></item>
///   <item><description>Phonetic Extensions: <a href="http://www.unicode.org/charts/PDF/U1D00.pdf">http://www.unicode.org/charts/PDF/U1D00.pdf</a></description></item>
///   <item><description>Phonetic Extensions Supplement: <a href="http://www.unicode.org/charts/PDF/U1D80.pdf">http://www.unicode.org/charts/PDF/U1D80.pdf</a></description></item>
///   <item><description>General Punctuation: <a href="http://www.unicode.org/charts/PDF/U2000.pdf">http://www.unicode.org/charts/PDF/U2000.pdf</a></description></item>
///   <item><description>Superscripts and Subscripts: <a href="http://www.unicode.org/charts/PDF/U2070.pdf">http://www.unicode.org/charts/PDF/U2070.pdf</a></description></item>
///   <item><description>Enclosed Alphanumerics: <a href="http://www.unicode.org/charts/PDF/U2460.pdf">http://www.unicode.org/charts/PDF/U2460.pdf</a></description></item>
///   <item><description>Dingbats: <a href="http://www.unicode.org/charts/PDF/U2700.pdf">http://www.unicode.org/charts/PDF/U2700.pdf</a></description></item>
///   <item><description>Supplemental Punctuation: <a href="http://www.unicode.org/charts/PDF/U2E00.pdf">http://www.unicode.org/charts/PDF/U2E00.pdf</a></description></item>
///   <item><description>Alphabetic Presentation Forms: <a href="http://www.unicode.org/charts/PDF/UFB00.pdf">http://www.unicode.org/charts/PDF/UFB00.pdf</a></description></item>
///   <item><description>Halfwidth and Fullwidth Forms: <a href="http://www.unicode.org/charts/PDF/UFF00.pdf">http://www.unicode.org/charts/PDF/UFF00.pdf</a></description></item>
/// </ul>
/// <para/>
/// See: <a href="http://en.wikipedia.org/wiki/Latin_characters_in_Unicode">http://en.wikipedia.org/wiki/Latin_characters_in_Unicode</a>
/// <para/>
/// For example, '&amp;agrave;' will be replaced by 'a'.
/// </summary>
public static partial class StringExtensions
{
    /// <summary>
    /// Converts characters above ASCII to their ASCII equivalents.  For example,
    /// accents are removed from accented characters. 
    /// </summary>
    /// <param name="input">     The string of characters to fold </param>
    /// <param name="length">    The length of the folded return string </param>
    /// <returns> length of output </returns>
    public static string FoldToASCII(this string input, int? length = null)
    {
        // See https://gist.github.com/andyraddatz/e6a396fb91856174d4e3f1bf2e10951c
    }
}

Hope that helps someone else, this is the most robust solution I've found!

Aborting a shell script if any command returns a non-zero value

I am just throwing in another one for reference since there was an additional question to Mark Edgars input and here is an additional example and touches on the topic overall:

[[ `cmd` ]] && echo success_else_silence

Which is the same as cmd || exit errcode as someone showed.

For example, I want to make sure a partition is unmounted if mounted:

[[ `mount | grep /dev/sda1` ]] && umount /dev/sda1

Redirect pages in JSP?

Hello there: If you need more control on where the link should redirect to, you could use this solution.

Ie. If the user is clicking in the CHECKOUT link, but you want to send him/her to checkout page if its registered(logged in) or registration page if he/she isn't.

You could use JSTL core LIKE:

<!--include the library-->
<%@ taglib prefix="core" uri="http://java.sun.com/jsp/jstl/core" %>

<%--create a var to store link--%>
<core:set var="linkToRedirect">
  <%--test the condition you need--%>
  <core:choose>
    <core:when test="${USER IS REGISTER}">
      checkout.jsp
    </core:when>
    <core:otherwise>
      registration.jsp
    </core:otherwise>
  </core:choose>
</core:set>

EXPLAINING: is the same as...

 //pseudo code
 if(condition == true)
   set linkToRedirect = checkout.jsp
 else
   set linkToRedirect = registration.jsp

THEN: in simple HTML...

<a href="your.domain.com/${linkToRedirect}">CHECKOUT</a>

In Typescript, How to check if a string is Numeric

Simple answer: (watch for blank & null)

isNaN(+'111') = false;
isNaN(+'111r') = true;
isNaN(+'r') = true;
isNaN(+'') = false;   
isNaN(null) = false;

https://codepen.io/CQCoder/pen/zYGEjxd?editors=1111

Removing duplicate rows in Notepad++

In version 7.8, you can accomplish this without any plugins - Edit -> Line Operations -> Remove Consecutive Duplicate Lines. You will have to sort the file to place duplicate lines in consecutive order before this works, but it does work like a charm.

Sorting options are available under Edit -> Line Operations -> Sort By ...

How to set session variable in jquery?

Use localStorage to store the fact that you opened the page :

$(document).ready(function() {
    var yetVisited = localStorage['visited'];
    if (!yetVisited) {
        // open popup
        localStorage['visited'] = "yes";
    }
});

Can't install via pip because of egg_info error

Having the same error trying to install matplotlib for Python 3, those solutions didn't work for me. It was just a matter of dependencies, though it wasn't clear in the error message.

I used sudo apt-get build-dep python3-matplotlib then sudo pip3 install matplotlib and it worked.

Hope it'll help !

Variable might not have been initialized error

Local variables do not get default values. Their initial values are undefined with out assigning values by some means. Before you can use local variables they must be initialized.

There is a big difference when you declare a variable at class level (as a member ie. as a field) and at method level.

If you declare a field at class level they get default values according to their type. If you declare a variable at method level or as a block (means anycode inside {}) do not get any values and remain undefined until somehow they get some starting values ie some values assigned to them.

Paramiko's SSHClient with SFTP

paramiko.SFTPClient

Sample Usage:

import paramiko
paramiko.util.log_to_file("paramiko.log")

# Open a transport
host,port = "example.com",22
transport = paramiko.Transport((host,port))

# Auth    
username,password = "bar","foo"
transport.connect(None,username,password)

# Go!    
sftp = paramiko.SFTPClient.from_transport(transport)

# Download
filepath = "/etc/passwd"
localpath = "/home/remotepasswd"
sftp.get(filepath,localpath)

# Upload
filepath = "/home/foo.jpg"
localpath = "/home/pony.jpg"
sftp.put(localpath,filepath)

# Close
if sftp: sftp.close()
if transport: transport.close()

How to make a div with a circular shape?

Demo

css

div {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: red;
}

html

<div></div>

Is it a good practice to use try-except-else in Python?

"I do not know if it is out of ignorance, but I do not like that kind of programming, as it is using exceptions to perform flow control."

In the Python world, using exceptions for flow control is common and normal.

Even the Python core developers use exceptions for flow-control and that style is heavily baked into the language (i.e. the iterator protocol uses StopIteration to signal loop termination).

In addition, the try-except-style is used to prevent the race-conditions inherent in some of the "look-before-you-leap" constructs. For example, testing os.path.exists results in information that may be out-of-date by the time you use it. Likewise, Queue.full returns information that may be stale. The try-except-else style will produce more reliable code in these cases.

"It my understanding that exceptions are not errors, they should only be used for exceptional conditions"

In some other languages, that rule reflects their cultural norms as reflected in their libraries. The "rule" is also based in-part on performance considerations for those languages.

The Python cultural norm is somewhat different. In many cases, you must use exceptions for control-flow. Also, the use of exceptions in Python does not slow the surrounding code and calling code as it does in some compiled languages (i.e. CPython already implements code for exception checking at every step, regardless of whether you actually use exceptions or not).

In other words, your understanding that "exceptions are for the exceptional" is a rule that makes sense in some other languages, but not for Python.

"However, if it is included in the language itself, there must be a good reason for it, isn't it?"

Besides helping to avoid race-conditions, exceptions are also very useful for pulling error-handling outside loops. This is a necessary optimization in interpreted languages which do not tend to have automatic loop invariant code motion.

Also, exceptions can simplify code quite a bit in common situations where the ability to handle an issue is far removed from where the issue arose. For example, it is common to have top level user-interface code calling code for business logic which in turn calls low-level routines. Situations arising in the low-level routines (such as duplicate records for unique keys in database accesses) can only be handled in top-level code (such as asking the user for a new key that doesn't conflict with existing keys). The use of exceptions for this kind of control-flow allows the mid-level routines to completely ignore the issue and be nicely decoupled from that aspect of flow-control.

There is a nice blog post on the indispensibility of exceptions here.

Also, see this Stack Overflow answer: Are exceptions really for exceptional errors?

"What is the reason for the try-except-else to exist?"

The else-clause itself is interesting. It runs when there is no exception but before the finally-clause. That is its primary purpose.

Without the else-clause, the only option to run additional code before finalization would be the clumsy practice of adding the code to the try-clause. That is clumsy because it risks raising exceptions in code that wasn't intended to be protected by the try-block.

The use-case of running additional unprotected code prior to finalization doesn't arise very often. So, don't expect to see many examples in published code. It is somewhat rare.

Another use-case for the else-clause is to perform actions that must occur when no exception occurs and that do not occur when exceptions are handled. For example:

recip = float('Inf')
try:
    recip = 1 / f(x)
except ZeroDivisionError:
    logging.info('Infinite result')
else:
    logging.info('Finite result')

Another example occurs in unittest runners:

try:
    tests_run += 1
    run_testcase(case)
except Exception:
    tests_failed += 1
    logging.exception('Failing test case: %r', case)
    print('F', end='')
else:
    logging.info('Successful test case: %r', case)
    print('.', end='')

Lastly, the most common use of an else-clause in a try-block is for a bit of beautification (aligning the exceptional outcomes and non-exceptional outcomes at the same level of indentation). This use is always optional and isn't strictly necessary.

Cannot deserialize instance of object out of START_ARRAY token in Spring Webservice

Your json contains an array, but you're trying to parse it as an object. This error occurs because objects must start with {.

You have 2 options:

You can get rid of the ShopContainer class and use Shop[] instead

ShopContainer response  = restTemplate.getForObject(
    url, ShopContainer.class);

replace with

Shop[] response  = restTemplate.getForObject(url, Shop[].class);

and then make your desired object from it.

You can change your server to return an object instead of a list

return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list);

replace with

return mapper.writerWithDefaultPrettyPrinter().writeValueAsString(
    new ShopContainer(list));

How to output numbers with leading zeros in JavaScript?

You could extend the Number object:

Number.prototype.pad = function(size) {
    var s = String(this);
    while (s.length < (size || 2)) {s = "0" + s;}
    return s;
}

Examples:

(9).pad();  //returns "09"

(7).pad(3);  //returns "007"

document.getElementById().value doesn't set the value

According to my tests with Chrome:

If you set a number input to a Number, then it works fine.

If you set a number input to a String that contains nothing but a number, then it works fine.

If you set a number input to a String that contains a number and some whitespace, then it blanks the input.

You probably have a space or a new line after the data in the server response that you actually care about.

Use document.getElementById("points").value = parseInt(request.responseText, 10); instead.

MassAssignmentException in Laravel

I was getting the MassAssignmentException when I have extends my model like this.

class Upload extends Eloquent {

}

I was trying to insert array like this

Upload::create($array);//$array was data to insert.

Issue has been resolve when I created Upload Model as

class Upload extends Eloquent {
    protected $guarded = array();  // Important
}

Reference https://github.com/aidkit/aidkit/issues/2#issuecomment-21055670

Difference in boto3 between resource, client, and session?

I'll try and explain it as simple as possible. So there is no guarantee of the accuracy of the actual terms.

Session is where to initiate the connectivity to AWS services. E.g. following is default session that uses the default credential profile(e.g. ~/.aws/credentials, or assume your EC2 using IAM instance profile )

sqs = boto3.client('sqs')
s3 = boto3.resource('s3')

Because default session is limit to the profile or instance profile used, sometimes you need to use the custom session to override the default session configuration (e.g. region_name, endpoint_url, etc. ) e.g.

# custom resource session must use boto3.Session to do the override
my_west_session = boto3.Session(region_name = 'us-west-2')
my_east_session = boto3.Session(region_name = 'us-east-1')
backup_s3 = my_west_session.resource('s3')
video_s3 = my_east_session.resource('s3')

# you have two choices of create custom client session. 
backup_s3c = my_west_session.client('s3')
video_s3c = boto3.client("s3", region_name = 'us-east-1')

Resource : This is the high-level service class recommended to be used. This allows you to tied particular AWS resources and passes it along, so you just use this abstraction than worry which target services are pointed to. As you notice from the session part, if you have a custom session, you just pass this abstract object than worrying about all custom regions,etc to pass along. Following is a complicated example E.g.

import boto3 
my_west_session = boto3.Session(region_name = 'us-west-2')
my_east_session = boto3.Session(region_name = 'us-east-1')
backup_s3 = my_west_session.resource("s3")
video_s3 = my_east_session.resource("s3")
backup_bucket = backup_s3.Bucket('backupbucket') 
video_bucket = video_s3.Bucket('videobucket')

# just pass the instantiated bucket object
def list_bucket_contents(bucket):
   for object in bucket.objects.all():
      print(object.key)

list_bucket_contents(backup_bucket)
list_bucket_contents(video_bucket)

Client is a low level class object. For each client call, you need to explicitly specify the targeting resources, the designated service target name must be pass long. You will lose the abstraction ability.

For example, if you only deal with the default session, this looks similar to boto3.resource.

import boto3 
s3 = boto3.client('s3')

def list_bucket_contents(bucket_name):
   for object in s3.list_objects_v2(Bucket=bucket_name) :
      print(object.key)

list_bucket_contents('Mybucket')

However, if you want to list objects from a bucket in different regions, you need to specify the explicit bucket parameter required for the client.

import boto3 
backup_s3 = my_west_session.client('s3',region_name = 'us-west-2')
video_s3 = my_east_session.client('s3',region_name = 'us-east-1')

# you must pass boto3.Session.client and the bucket name 
def list_bucket_contents(s3session, bucket_name):
   response = s3session.list_objects_v2(Bucket=bucket_name)
   if 'Contents' in response:
     for obj in response['Contents']:
        print(obj['key'])

list_bucket_contents(backup_s3, 'backupbucket')
list_bucket_contents(video_s3 , 'videobucket')

Running EXE with parameters

System.Diagnostics.Process.Start("PATH to exe", "Command Line Arguments");

unix - count of columns in file

select any row in the file (in the example below, it's the 2nd row) and count the number of columns, where the delimiter is a space:

sed -n 2p text_file.dat | tr ' ' '\n' | wc -l

Apache giving 403 forbidden errors

I just fixed this issue after struggling for a few days. Here's what worked for me:

First, check your Apache error_log file and look at the most recent error message.

If it says something like:
```
access to /mySite denied (filesystem path
'/Users/myusername/Sites/mySite') because search permissions
are missing on a component of the path
```
then there is a problem with your file permissions. You can fix them by running these commands from the terminal:
```
$ cd /Users/myusername/Sites/mySite
$ find . -type f -exec chmod 644 {} \;
$ find . -type d -exec chmod 755 {} \;
```
Then, refresh the URL where your website should be (such as http://localhost/mySite). If you're still getting a 403 error, and if your Apache error_log still says the same thing, then progressively move up your directory tree, adjusting the directory permissions as you go. You can do this from the terminal by:
```
$ cd ..
$ chmod 755 mySite
```
If necessary, continue with:
```
$ cd ..
$ chmod Sites 
```
and, if necessary,
```
$ cd ..
$ chmod myusername
```
DO NOT go up farther than that. You could royally mess up your system. If you still get the error that says search permissions are missing on a component of the path, I don't know what you should do. However, I encountered a different error (the one below) which I fixed as follows:
If your error_log says something like:
```
client denied by server configuration:
/Users/myusername/Sites/mySite
```
then your problem is not with your file permissions, but instead with your Apache configuration.

Notice that in your httpd.conf file, you will see a default configuration like this (Apache 2.4+):
```
<Directory />
    AllowOverride none
    Require all denied
</Directory>
```
or like this (Apache 2.2):
```
<Directory />
  Order deny,allow
  Deny from all
</Directory>
```
DO NOT change this! We will not override these permissions globally, but instead in your httpd-vhosts.conf file. First, however, make sure that your vhost Include line in httpd.conf is uncommented. It should look like this. (Your exact path may be different.)
```
# Virtual hosts
Include etc/extra/httpd-vhosts.conf
```
Now, open the httpd-vhosts.conf file that you just Included. Add an entry for your webpage if you don't already have one. It should look something like this. The DocumentRoot and Directory paths should be identical, and should point to wherever your index.html or index.php file is located. For me, that's within the public subdirectory.

For Apache 2.2:
```
<VirtualHost *:80>
#     ServerAdmin [email protected]
    DocumentRoot "/Users/myusername/Sites/mySite/public"
    ServerName mysite
#     ErrorLog "logs/dummy-host2.example.com-error_log"
#     CustomLog "logs/dummy-host2.example.com-access_log" common
    <Directory "/Users/myusername/Sites/mySite/public">
        Options Indexes FollowSymLinks Includes ExecCGI
        AllowOverride All
        Order allow,deny
        Allow from all
        Require all granted
    </Directory>
</VirtualHost>
```
The lines saying
```
AllowOverride All
Require all granted
```
are critical for Apache 2.4+. Without these, you will not be overriding the default Apache settings specified in httpd.conf. Note that if you are using Apache 2.2, these lines should instead say
```
Order allow,deny
Allow from all
```
This change has been a major source of confusion for googlers of this problem, such as I, because copy-pasting these Apache 2.2 lines will not work in Apache 2.4+, and the Apache 2.2 lines are still commonly found on older help threads.

Once you have saved your changes, restart Apache. The command for this will depend on your OS and installation, so google that separately if you need help with it.

I hope this helps someone else!

PS: If you are having trouble finding these .conf files, try running the find command, such as:

$ find / -name httpd.conf

Get index of element as child relative to parent

Yet another way

$("#wizard li").click(function () 
{
    $($(this),'#wizard"').index();
});

Demo https://jsfiddle.net/m9xge3f5/

How do we update URL or query strings using javascript/jQuery without reloading the page?

You can use :

window.history.pushState('obj', 'newtitle', newUrlWithQueryString)

Remove rows not .isin('X')

You have many options. Collating some of the answers above and the accepted answer from this post you can do:
1. df[-df["column"].isin(["value"])]
2. df[~df["column"].isin(["value"])]
3. df[df["column"].isin(["value"]) == False]
4. df[np.logical_not(df["column"].isin(["value"]))]

Note: for option 4 for you'll need to import numpy as np

Update: You can also use the .query method for this too. This allows for method chaining:
5. df.query("column not in @values").
where values is a list of the values that you don't want to include.

Entity Framework vs LINQ to SQL

I am working for customer that has a big project that is using Linq-to-SQL. When the project started it was the obvious choice, because Entity Framework was lacking some major features at that time and performance of Linq-to-SQL was much better.

Now EF has evolved and Linq-to-SQL is lacking async support, which is great for highly scalable services. We have 100+ requests per second sometimes and despite we have optimized our databases, most queries still take several milliseconds to complete. Because of the synchronous database calls, the thread is blocked and not available for other requests.

We are thinking to switch to Entity Framework, solely for this feature. It's a shame that Microsoft didn't implement async support into Linq-to-SQL (or open-sourced it, so the community could do it).

Addendum December 2018: Microsoft is moving towards .NET Core and Linq-2-SQL isn't support on .NET Core, so you need to move to EF to make sure you can migrate to EF.Core in the future.

There are also some other options to consider, such as LLBLGen. It's a mature ORM solution that exists already a long time and has been proven more future-proof then the MS data solutions (ODBC, ADO, ADO.NET, Linq-2-SQL, EF, EF.core).

Read Variable from Web.Config

I would suggest you to don't modify web.config from your, because every time when change, it will restart your application.

However you can read web.config using System.Configuration.ConfigurationManager.AppSettings

Android Emulator: Installation error: INSTALL_FAILED_VERSION_DOWNGRADE

According to sdk src code from ...\android-22\android\content\pm\PackageManager.java

/**
 * Installation return code: this is passed to the {@link IPackageInstallObserver} by
 * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
 * the new package has an older version code than the currently installed package.
 * @hide
 */
public static final int INSTALL_FAILED_VERSION_DOWNGRADE = -25;

if the new package has an older version code than the currently installed package.

Adding multiple class using ng-class

Here is an example comparing multiple angular-ui-router states using the OR || operator:

<li ng-class="
    {
        warning:
            $state.includes('out.pay.code.wrong')
            || $state.includes('out.pay.failed')
        ,
        active:
            $state.includes('out.pay')
    }
">

It will give the li the classes warning and/or active, depening on whether the conditions are met.

Can I assume (bool)true == (int)1 for any C++ compiler?

Charles Bailey's answer is correct. The exact wording from the C++ standard is (§4.7/4): "If the source type is bool, the value false is converted to zero and the value true is converted to one."

Edit: I see he's added the reference as well -- I'll delete this shortly, if I don't get distracted and forget...

Edit2: Then again, it is probably worth noting that while the Boolean values themselves always convert to zero or one, a number of functions (especially from the C standard library) return values that are "basically Boolean", but represented as ints that are normally only required to be zero to indicate false or non-zero to indicate true. For example, the is* functions in <ctype.h> only require zero or non-zero, not necessarily zero or one.

If you cast that to bool, zero will convert to false, and non-zero to true (as you'd expect).

Deserialize a JSON array in C#

[JsonProperty("name")]
public string name { get; set; }
[JsonProperty("Age")]
public int required { get; set; }
[JsonProperty("Location")]
public string type { get; set; }

and Remove a "{"..,

strFieldString = strFieldString.Remove(0, strFieldString.IndexOf('{'));

DeserializeObject..,

   optionsItem objActualField = JsonConvert.DeserializeObject<optionsItem(strFieldString);

How can I get the current contents of an element in webdriver

My answer is based on this answer: How can I get the current contents of an element in webdriver just more like copy-paste.

from selenium import webdriver

driver = webdriver.Firefox()
driver.get('http://www.w3c.org')
element = driver.find_element_by_name('q')
element.send_keys('hi mom')

element_text = element.text
element_attribute_value = element.get_attribute('value')

print (element)
print ('element.text: {0}'.format(element_text))
print ('element.get_attribute(\'value\'): {0}'.format(element_attribute_value))


element = driver.find_element_by_css_selector('.description.expand_description > p')
element_text = element.text
element_attribute_value = element.get_attribute('value')

print (element)
print ('element.text: {0}'.format(element_text))
print ('element.get_attribute(\'value\'): {0}'.format(element_attribute_value))
driver.quit()

Determine the data types of a data frame's columns

Here is a function that is part of the helpRFunctions package that will return a list of all of the various data types in your data frame, as well as the specific variable names associated with that type.

install.package('devtools') # Only needed if you dont have this installed.
library(devtools)
install_github('adam-m-mcelhinney/helpRFunctions')
library(helpRFunctions)
my.data <- data.frame(y=rnorm(5), 
                  x1=c(1:5), 
                  x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
                  X3=letters[1:5])
t <- list.df.var.types(my.data)
t$factor
t$integer
t$logical
t$numeric

You could then do something like var(my.data[t$numeric]).

Hope this is helpful!

How to create a shortcut using PowerShell

Beginning PowerShell 5.0 New-Item, Remove-Item, and Get-ChildItem have been enhanced to support creating and managing symbolic links. The ItemType parameter for New-Item accepts a new value, SymbolicLink. Now you can create symbolic links in a single line by running the New-Item cmdlet.

New-Item -ItemType SymbolicLink -Path "C:\temp" -Name "calc.lnk" -Value "c:\windows\system32\calc.exe"

Be Carefull a SymbolicLink is different from a Shortcut, shortcuts are just a file. They have a size (A small one, that just references where they point) and they require an application to support that filetype in order to be used. A symbolic link is filesystem level, and everything sees it as the original file. An application needs no special support to use a symbolic link.

Anyway if you want to create a Run As Administrator shortcut using Powershell you can use

$file="c:\temp\calc.lnk"
$bytes = [System.IO.File]::ReadAllBytes($file)
$bytes[0x15] = $bytes[0x15] -bor 0x20 #set byte 21 (0x15) bit 6 (0x20) ON (Use –bor to set RunAsAdministrator option and –bxor to unset)
[System.IO.File]::WriteAllBytes($file, $bytes)

If anybody want to change something else in a .LNK file you can refer to official Microsoft documentation.

Continuous CSS rotation animation on hover, animated back to 0deg on hover out

Here's a simple working solution:

@-moz-keyframes spin { 100% { -moz-transform: rotate(360deg); } }
@-webkit-keyframes spin { 100% { -webkit-transform: rotate(360deg); } }
@keyframes spin { 100% { -webkit-transform: rotate(360deg); transform:rotate(360deg); } }

.elem:hover {
    -webkit-animation:spin 1.5s linear infinite;
    -moz-animation:spin 1.5s linear infinite;
    animation:spin 1.5s linear infinite;
}

What does \d+ mean in regular expression terms?

\d is a digit (a character in the range 0-9), and + means 1 or more times. So, \d+ is 1 or more digits.

This is about as simple as regular expressions get. You should try reading up on regular expressions a little bit more. Google has a lot of results for regular expression tutorial, for instance. Or you could try using a tool like the free Regex Coach that will let you enter a regular expression and sample text, then indicate what (if anything) matches the regex.

What does a lazy val do?

This feature helps not only delaying expensive calculations, but is also useful to construct mutual dependent or cyclic structures. E.g. this leads to an stack overflow:

trait Foo { val foo: Foo }
case class Fee extends Foo { val foo = Faa() }
case class Faa extends Foo { val foo = Fee() }

println(Fee().foo)
//StackOverflowException

But with lazy vals it works fine

trait Foo { val foo: Foo }
case class Fee extends Foo { lazy val foo = Faa() }
case class Faa extends Foo { lazy val foo = Fee() }

println(Fee().foo)
//Faa()

How to use an image for the background in tkinter?

One simple method is to use place to use an image as a background image. This is the type of thing that place is really good at doing.

For example:

background_image=tk.PhotoImage(...)
background_label = tk.Label(parent, image=background_image)
background_label.place(x=0, y=0, relwidth=1, relheight=1)

You can then grid or pack other widgets in the parent as normal. Just make sure you create the background label first so it has a lower stacking order.

Note: if you are doing this inside a function, make sure you keep a reference to the image, otherwise the image will be destroyed by the garbage collector when the function returns. A common technique is to add a reference as an attribute of the label object:

background_label.image = background_image

Prevent WebView from displaying "web page not available"

Try this

 @SuppressWarnings("deprecation")
 @Override
 public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
      // Your handling
 }

 @Override
 public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
          onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
      }
 }

How to convert std::string to lower case?

tl;dr

Use the ICU library. If you don't, your conversion routine will break silently on cases you are probably not even aware of existing.

First you have to answer a question: What is the encoding of your std::string? Is it ISO-8859-1? Or perhaps ISO-8859-8? Or Windows Codepage 1252? Does whatever you're using to convert upper-to-lowercase know that? (Or does it fail miserably for characters over 0x7f?)

If you are using UTF-8 (the only sane choice among the 8-bit encodings) with std::string as container, you are already deceiving yourself if you believe you are still in control of things. You are storing a multibyte character sequence in a container that is not aware of the multibyte concept, and neither are most of the operations you can perform on it! Even something as simple as .substr() could result in invalid (sub-) strings because you split in the middle of a multibyte sequence.

As soon as you try something like std::toupper( 'ß' ), or std::tolower( 'S' ) in any encoding, you are in trouble. Because 1), the standard only ever operates on one character at a time, so it simply cannot turn ß into SS as would be correct. And 2), the standard only ever operates on one character at a time, so it cannot decide whether S is in the middle of a word (where s would be correct), or at the end (?). Another example would be std::tolower( 'I' ), which should yield different results depending on the locale -- virtually everywhere you would expect i, but in Turkey i (LATIN SMALL LETTER DOTLESS I) is the correct answer (which, again, is more than one byte in UTF-8 encoding).

So, any case conversion that works on a character at a time, or worse, a byte at a time, is broken by design. This includes all the std:: variants in existence at this time.

Then there is the point that the standard library, for what it is capable of doing, is depending on which locales are supported on the machine your software is running on... and what do you do if your target locale is among the not supported on your client's machine?

So what you are really looking for is a string class that is capable of dealing with all this correctly, and that is not any of the std::basic_string<> variants.

(C++11 note: std::u16string and std::u32string are better, but still not perfect. C++20 brought std::u8string, but all these do is specify the encoding. In many other respects they still remain ignorant of Unicode mechanics, like normalization, collation, ...)

While Boost looks nice, API wise, Boost.Locale is basically a wrapper around ICU. If Boost is compiled with ICU support... if it isn't, Boost.Locale is limited to the locale support compiled for the standard library.

And believe me, getting Boost to compile with ICU can be a real pain sometimes. (There are no pre-compiled binaries for Windows that include ICU, so you'd have to supply them together with your application, and that opens a whole new can of worms...)

So personally I would recommend getting full Unicode support straight from the horse's mouth and using the ICU library directly:

#include <unicode/unistr.h>
#include <unicode/ustream.h>
#include <unicode/locid.h>

#include <iostream>

int main()
{
    /*                          "Odysseus" */
    char const * someString = u8"???SS??S";
    icu::UnicodeString someUString( someString, "UTF-8" );
    // Setting the locale explicitly here for completeness.
    // Usually you would use the user-specified system locale,
    // which *does* make a difference (see i vs. i above).
    std::cout << someUString.toLower( "el_GR" ) << "\n";
    std::cout << someUString.toUpper( "el_GR" ) << "\n";
    return 0;
}

Compile (with G++ in this example):

g++ -Wall example.cpp -licuuc -licuio

This gives:

?d?sse??

Note that the S<->s conversion in the middle of the word, and the S<->? conversion at the end of the word. No <algorithm>-based solution can give you that.

Git push failed, "Non-fast forward updates were rejected"

(One) Solution for Netbeans 7.1: Try a pull. This will probably also fail. Now have a look into the logs (they are usually shown now in the IDE). There's one/more line saying:

"Pull failed due to this file:"

Search that file, delete it (make a backup before). Usually it's a .gitignore file, so you will not delete code. Redo the push. Everything should work fine now.

What are the sizes used for the iOS application splash screen?

For Xcode 9 and latest devices

Portrait

iPhone 4/4S 640 x 960

iPhone 5/5C/5S iPod touch 5th generation 640 x 1136

iPhone 6/7/8 750 x 1334

iPhone 6/7/8 Plus 1242 x 2208

iPhone X 1125 x 2436

iPad non-retina 768 x 1024

iPad retina 1536 x 2048

Landscape

iPhone 6, 7 and 8 plus 2208 x 1242

iPhone X 2436 x 1125

iPad non-retina 1024 x 768

iPad retina 2048 x 1536

SQL Server Creating a temp table for this query

If you want to just create a temp table inside the query that will allow you to do something with the results that you deposit into it you can do something like the following:

DECLARE @T1 TABLE (
Item 1 VARCHAR(200)
, Item 2 VARCHAR(200)
, ...
, Item n VARCHAR(500)
)

On the top of your query and then do an

INSERT INTO @T1
SELECT
FROM
(...)

check for null date in CASE statement, where have I gone wrong?

select Id, StartDate,
Case IsNull (StartDate , '01/01/1800')
When '01/01/1800' then
  'Awaiting'
Else
  'Approved'
END AS StartDateStatus
From MyTable

PHP cURL not working - WAMP on Windows 7 64 bit

This is what worked for me

Answered by Soren from another SO thread - CURL for WAMP

"There seems to be a bug somewhere. If you are experiencing this on Win 7 64 bit then try installing apache addon version 2.2.9 and php addon version 5.3.1 and switching to those in WAMP and then activating the CURL extension. That worked for me."

Log all queries in mysql

Top answer doesn't work in mysql 5.6+. Use this instead:

[mysqld]
general_log = on
general_log_file=/usr/log/general.log

in your my.cnf / my.ini file

Ubuntu/Debian: /etc/mysql/my.cnf
Windows: c:\ProgramData\MySQL\MySQL Server 5.x
wamp: c:\wamp\bin\mysql\mysqlx.y.z\my.ini
xampp: c:\xampp\mysql\bin\my.ini.

Where can I find a list of keyboard keycodes?

I know this was asked awhile back, but I found a comprehensive list of the virtual keyboard key codes right in MSDN, for use in C/C++. This also includes the mouse events. Note it is different than the javascript key codes (I noticed it around the VK_OEM section).

Here's the link:
http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx

Adding an img element to a div with javascript

It should be:

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

And place your div before your javascript, because if you don't, the javascript executes before the div exists. Or wait for it to load. So your code looks like this:

<html>

<body>
<script type="text/javascript">
window.onload=function(){
var elem = document.createElement("img");
elem.setAttribute("src", "http://img.zohostatic.com/discussions/v1/images/defaultPhoto.png");
elem.setAttribute("height", "768");
elem.setAttribute("width", "1024");
elem.setAttribute("alt", "Flower");
document.getElementById("placehere").appendChild(elem);
}
</script>
<div id="placehere">

</div>

</body>
</html>

To prove my point, see this with the onload and this without the onload. Fire up the console and you'll find an error stating that the div doesn't exist or cannot find appendChild method of null.

Read file content from S3 bucket with boto3

boto3 offers a resource model that makes tasks like iterating through objects easier. Unfortunately, StreamingBody doesn't provide readline or readlines.

s3 = boto3.resource('s3')
bucket = s3.Bucket('test-bucket')
# Iterates through all the objects, doing the pagination for you. Each obj
# is an ObjectSummary, so it doesn't contain the body. You'll need to call
# get to get the whole body.
for obj in bucket.objects.all():
    key = obj.key
    body = obj.get()['Body'].read()

mySQL :: insert into table, data from another table?

for whole row

insert into xyz select * from xyz2 where id="1";

for selected column

insert into xyz(t_id,v_id,f_name) select t_id,v_id,f_name from xyz2 where id="1";

How to Troubleshoot Intermittent SQL Timeout Errors

Since I do troubleshooting everyday as a part of my job, here is what I would like to do:

Since it's SQL Server 2008 R2, you can run SQLDiag which comes as a part of the product. You can refer books online for more details. In brief, capture Server Side trace and blocker script.
Once trace is captured, look for "Attention" event. That would be the spid which has received the error. If you filter by SPID, you would see RPC:Completed event before "Attention". Check the time over there. Is that time 30 seconds? If yes, then client waited for 30 second to get response from SQL and got "timed out" [This is client setting as SQL would never stop and connection]
Now, check if the query which was running really should take 30 seconds?
If yes then tune the query or increase the timeout setting from the client.
If no then this query must be waiting for some resources (blocked)
At this point go back to Blocker Script and check the time frame when "Attention" came

Above is assuming that issue is with SQL Server not network related!

Best way to use PHP to encrypt and decrypt passwords?

This will only give you marginal protection. If the attacker can run arbitrary code in your application they can get at the passwords in exactly the same way your application can. You could still get some protection from some SQL injection attacks and misplaced db backups if you store a secret key in a file and use that to encrypt on the way to the db and decrypt on the way out. But you should use bindparams to completely avoid the issue of SQL injection.

If decide to encrypt, you should use some high level crypto library for this, or you will get it wrong. You'll have to get the key-setup, message padding and integrity checks correct, or all your encryption effort is of little use. GPGME is a good choice for one example. Mcrypt is too low level and you will probably get it wrong.

Date validation with ASP.NET validator

A CustomValidator would also work here:

<asp:CustomValidator runat="server"
    ID="valDateRange" 
    ControlToValidate="txtDatecompleted"
    onservervalidate="valDateRange_ServerValidate" 
    ErrorMessage="enter valid date" />

Code-behind:

protected void valDateRange_ServerValidate(object source, ServerValidateEventArgs args)
{
    DateTime minDate = DateTime.Parse("1000/12/28");
    DateTime maxDate = DateTime.Parse("9999/12/28");
    DateTime dt;

    args.IsValid = (DateTime.TryParse(args.Value, out dt) 
                    && dt <= maxDate 
                    && dt >= minDate);
}

Nested rows with bootstrap grid system?

Bootstrap Version 3.x

As always, read Bootstrap's great documentation:

3.x Docs: https://getbootstrap.com/docs/3.3/css/#grid-nesting

Make sure the parent level row is inside of a .container element. Whenever you'd like to nest rows, just open up a new .row inside of your column.

Here's a simple layout to work from:

<div class="container">
    <div class="row">
        <div class="col-xs-6">
            <div class="big-box">image</div>
        </div>
        <div class="col-xs-6">
            <div class="row">
                <div class="col-xs-6"><div class="mini-box">1</div></div>
                <div class="col-xs-6"><div class="mini-box">2</div></div>
                <div class="col-xs-6"><div class="mini-box">3</div></div>
                <div class="col-xs-6"><div class="mini-box">4</div></div>
            </div>
        </div>
    </div>
</div>

Bootstrap Version 4.0

4.0 Docs: http://getbootstrap.com/docs/4.0/layout/grid/#nesting

Here's an updated version for 4.0, but you should really read the entire docs section on the grid so you understand how to leverage this powerful feature

<div class="container">
  <div class="row">
    <div class="col big-box">
      image
    </div>

    <div class="col">
      <div class="row">
        <div class="col mini-box">1</div>
        <div class="col mini-box">2</div>
      </div>
      <div class="row">
        <div class="col mini-box">3</div>
        <div class="col mini-box">4</div>
      </div>
    </div>

  </div>
</div>

Demo in Fiddle jsFiddle 3.x | jsFiddle 4.0

Which will look like this (with a little bit of added styling):

screenshot

Get hours difference between two dates in Moment Js

var __startTime = moment("2016-06-06T09:00").format();
var __endTime = moment("2016-06-06T21:00").format();

var __duration = moment.duration(moment(__endTime).diff(__startTime));
var __hours = __duration.asHours();
console.log(__hours);

how to set value of a input hidden field through javascript?

The first thing I will try - determine if your code with alerts is actually rendered. I see some server "if" code in what you posted, so may be condition to render javascript is not satisfied. So, on the page you working on, right-click -> view source. Try to find the js code there. Please tell us if you found the code on the page.

ReDim Preserve to a Multi-Dimensional Array in Visual Basic 6

Easiest way to do this in VBA is to create a function that takes in an array, your new amount of rows, and new amount of columns.

Run the below function to copy in all of the old data back to the array after it has been resized.

 function dynamic_preserve(array1, num_rows, num_cols)

        dim array2 as variant

        array2 = array1

        reDim array1(1 to num_rows, 1 to num_cols)

        for i = lbound(array2, 1) to ubound(array2, 2)

               for j = lbound(array2,2) to ubound(array2,2)

                      array1(i,j) = array2(i,j)

               next j

        next i

        dynamic_preserve = array1

end function

Use child_process.execSync but keep output in console

You can simply use .toString().

var result = require('child_process').execSync('rsync -avAXz --info=progress2 "/src" "/dest"').toString();
console.log(result);

This has been tested on Node v8.5.0, I'm not sure about previous versions. According to @etov, it doesn't work on v6.3.1 - I'm not sure about in-between.

Edit: Looking back on this, I've realised that it doesn't actually answer the specific question because it doesn't show the output to you 'live' — only once the command has finished running.

However, I'm leaving this answer here because I know quite a few people come across this question just looking for how to print the result of the command after execution.

Run a Docker image as a container

I had the same problem. I ran my Docker image, and it created a container with a specific CONTAINER_ID. I wanted to work with the same container:

First run your Docker image:

docker run -it -p 8888:8888 -p 6006:6006 -v ~/:/host waleedka/modern-deep-learning

Then list all the containers you have made:

sudo docker ps -a

And select the container you want to work with (mine is 167ddd6d7f15):

sudo docker start -ai 167ddd6d7f15

How to convert String into Hashmap in java

String value = "{first_name = naresh,last_name = kumar,gender = male}"

Let's start

Remove { and } from the String>>first_name = naresh,last_name = kumar,gender = male
Split the String from ,>> array of 3 element
Now you have an array with 3 element
Iterate the array and split each element by =
Create a Map<String,String> put each part separated by =. first part as Key and second part as Value

Twitter Bootstrap modal: How to remove Slide down effect

look at http://quickrails.com/twitter-bootstrap-modal-how-to-remove-slide-down-effect-but-leaves-the-fade/

.modal.fade .modal-dialog 
{
    -moz-transition: none !important;
    -o-transition: none !important;
    -webkit-transition: none !important;
    transition: none !important;
    -moz-transform: none !important;
    -ms-transform: none !important;
    -o-transform: none !important;
    -webkit-transform: none !important;
    transform: none !important;
}

How to change the type of a field?

What really helped me to change the type of the object in MondoDB was just this simple line, perhaps mentioned before here...:

db.Users.find({age: {$exists: true}}).forEach(function(obj) {
    obj.age = new NumberInt(obj.age);
    db.Users.save(obj);
});

Users are my collection and age is the object which had a string instead of an integer (int32).

Convert DataSet to List

Fill the dataset with data from, say a stored proc command

DbDataAdapter adapter = DbProviderFactories.GetFactory(cmd.Connection).CreateDataAdapter();
adapter.SelectCommand = cmd;
DataSet ds = new DataSet();
adapter.Fill(ds);

Get The Schema,

string s = ds.GetXmlSchema();

save it to a file say: datasetSchema.xsd. Generate the C# classes for the Schema: (at the VS Command Prompt)

xsd datasetSchema.xsd /c

Now, when you need to convert the DataSet data to classes you can deserialize (the default name given to the generated root class is NewDataSet):

public static T Create<T>(string xml)
{
    XmlSerializer serializer = new XmlSerializer(typeof(T));
    using (StringReader reader = new StringReader(xml))
    {
        T t = (T)serializer.Deserialize(reader);

        reader.Close();
        return t;
    }
}

var xml = ds.GetXml();
var dataSetObjects = Create<NewDataSet>(xml);

Filter output in logcat by tagname

Another option is setting the log levels for specific tags:

adb logcat SensorService:S PowerManagerService:S NfcService:S power:I Sensors:E

If you just want to set the log levels for some tags you can do it on a tag by tag basis.

How to get the difference (only additions) between two files in linux

diff and then grep for the edit type you want.

diff -u A1 A2 | grep -E "^\+"

Get sum of MySQL column in PHP

Try this:

$sql = mysql_query("SELECT SUM(Value) as total FROM Codes");
$row = mysql_fetch_array($sql);
$sum = $row['total'];

Using LINQ to concatenate strings

I blogged about this a while ago, what I did seams to be exactly what you're looking for:

http://ondevelopment.blogspot.com/2009/02/string-concatenation-made-easy.html

In the blog post describe how to implement extension methods that works on IEnumerable and are named Concatenate, this will let you write things like:

var sequence = new string[] { "foo", "bar" };
string result = sequence.Concatenate();

Or more elaborate things like:

var methodNames = typeof(IFoo).GetMethods().Select(x => x.Name);
string result = methodNames.Concatenate(", ");

Can we have multiple "WITH AS" in single sql - Oracle SQL

the correct syntax is -

with t1
as
(select * from tab1
where conditions...
),
t2
as
(select * from tab2
where conditions...
(you can access columns of t1 here as well)
)
select * from t1, t2
where t1.col1=t2.col2;

python - if not in list

You better do this syntax

if not (item in mylist):  
    Code inside the if

Javascript loading CSV file into an array

You can't use AJAX to fetch files from the user machine. This is absolutely the wrong way to go about it.

Use the FileReader API:

<input type="file" id="file input">

js:

console.log(document.getElementById("file input").files); // list of File objects

var file = document.getElementById("file input").files[0];
var reader = new FileReader();
content = reader.readAsText(file);
console.log(content);

Then parse content as CSV. Keep in mind that your parser currently does not deal with escaped values in CSV like: value1,value2,"value 3","value ""4"""

What is C# analog of C++ std::pair?

Some answers seem just wrong,

you can't use dictionary how would store the pairs (a,b) and (a,c). Pairs concept should not be confused with associative look up of key and values
lot of the above code seems suspect

Here is my pair class

public class Pair<X, Y>
{
    private X _x;
    private Y _y;

    public Pair(X first, Y second)
    {
        _x = first;
        _y = second;
    }

    public X first { get { return _x; } }

    public Y second { get { return _y; } }

    public override bool Equals(object obj)
    {
        if (obj == null)
            return false;
        if (obj == this)
            return true;
        Pair<X, Y> other = obj as Pair<X, Y>;
        if (other == null)
            return false;

        return
            (((first == null) && (other.first == null))
                || ((first != null) && first.Equals(other.first)))
              &&
            (((second == null) && (other.second == null))
                || ((second != null) && second.Equals(other.second)));
    }

    public override int GetHashCode()
    {
        int hashcode = 0;
        if (first != null)
            hashcode += first.GetHashCode();
        if (second != null)
            hashcode += second.GetHashCode();

        return hashcode;
    }
}

Here is some test code:

[TestClass]
public class PairTest
{
    [TestMethod]
    public void pairTest()
    {
        string s = "abc";
        Pair<int, string> foo = new Pair<int, string>(10, s);
        Pair<int, string> bar = new Pair<int, string>(10, s);
        Pair<int, string> qux = new Pair<int, string>(20, s);
        Pair<int, int> aaa = new Pair<int, int>(10, 20);

        Assert.IsTrue(10 == foo.first);
        Assert.AreEqual(s, foo.second);
        Assert.AreEqual(foo, bar);
        Assert.IsTrue(foo.GetHashCode() == bar.GetHashCode());
        Assert.IsFalse(foo.Equals(qux));
        Assert.IsFalse(foo.Equals(null));
        Assert.IsFalse(foo.Equals(aaa));

        Pair<string, string> s1 = new Pair<string, string>("a", "b");
        Pair<string, string> s2 = new Pair<string, string>(null, "b");
        Pair<string, string> s3 = new Pair<string, string>("a", null);
        Pair<string, string> s4 = new Pair<string, string>(null, null);
        Assert.IsFalse(s1.Equals(s2));
        Assert.IsFalse(s1.Equals(s3));
        Assert.IsFalse(s1.Equals(s4));
        Assert.IsFalse(s2.Equals(s1));
        Assert.IsFalse(s3.Equals(s1));
        Assert.IsFalse(s2.Equals(s3));
        Assert.IsFalse(s4.Equals(s1));
        Assert.IsFalse(s1.Equals(s4));
    }
}

Programs & Examples On #Gesture recognition

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Draw on HTML5 Canvas using a mouse

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How to simulate a touch event in Android?

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ImportError: No module named model_selection

'Java' is not recognized as an internal or external command

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Presenting a UIAlertController properly on an iPad using iOS 8

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How to programmatically set the ForeColor of a label to its default?

Tracking Google Analytics Page Views with AngularJS

I want to vertical-align text in select box

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Command to close an application of console?

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error code 1292 incorrect date value mysql

Correctly determine if date string is a valid date in that format

How to smooth a curve in the right way?

What are POD types in C++?

C++ convert hex string to signed integer

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Docker command can't connect to Docker daemon

Best way to test for a variable's existence in PHP; isset() is clearly broken

jQuery OR Selector?

JavaScript Editor Plugin for Eclipse

node.js string.replace doesn't work?

BootStrap : Uncaught TypeError: $(...).datetimepicker is not a function

Change MySQL root password in phpMyAdmin

Blade if(isset) is not working Laravel

How to fix HTTP 404 on Github Pages?

Detecting input change in jQuery?

PHP using Gettext inside <<<EOF string

How do I print a double value without scientific notation using Java?

Select All as default value for Multivalue parameter

Java Webservice Client (Best way)

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