How to copy selected lines to clipboard in vim

I have added the following line to my .vimrc

vnoremap <F5> "+y<CR>

This allows you to copy the selected text to the clipboard by pressing F5. You must be in visual mode for this to work.

Get only records created today in laravel

for Laravel 5.6+ users, you can just do

    $posts = Post::whereDate('created_at', Carbon::today())->get();

Happy coding

Getting a directory name from a filename

Use boost::filesystem. It will be incorporated into the next standard anyway so you may as well get used to it.

Is there any way to return HTML in a PHP function? (without building the return value as a string)

Yes, there is: you can capture the echoed text using ob_start:

<?php function TestBlockHTML($replStr) {
    ob_start(); ?>
    <html>
    <body><h1><?php echo($replStr) ?></h1>
    </html>
<?php
    return ob_get_clean();
} ?>

Missing artifact com.sun:tools:jar

The same with me and Windows 7. I ended up adding two lines to eclipse.ini:

-vm 
C:\Program Files\Java\jdk1.6.0_35\bin

I tried using %JAVA_HOME% there, but it did not work.

check if a string matches an IP address pattern in python?

update: The original answer bellow is good for 2011, but since 2012, one is likely better using Python's ipaddress stdlib module - besides checking IP validity for IPv4 and IPv6, it can do a lot of other things as well.</update>

It looks like you are trying to validate IP addresses. A regular expression is probably not the best tool for this.

If you want to accept all valid IP addresses (including some addresses that you probably didn't even know were valid) then you can use IPy (Source):

from IPy import IP
IP('127.0.0.1')

If the IP address is invalid it will throw an exception.

Or you could use socket (Source):

import socket
try:
    socket.inet_aton(addr)
    # legal
except socket.error:
    # Not legal

If you really want to only match IPv4 with 4 decimal parts then you can split on dot and test that each part is an integer between 0 and 255.

def validate_ip(s):
    a = s.split('.')
    if len(a) != 4:
        return False
    for x in a:
        if not x.isdigit():
            return False
        i = int(x)
        if i < 0 or i > 255:
            return False
    return True

Note that your regular expression doesn't do this extra check. It would accept 999.999.999.999 as a valid address.

sudo: port: command not found

there might be the situation your machine is managed by Puppet or so. Then changing root .profile or .bash_rc file does not work at all. Therefore you could add the following to your .profile file. After that you can use "mydo" instead of "sudo". It works perfectly for me.

function mydo() {
    echo Executing sudo with: "$1" "${@:2}"
    sudo $(which $1) "${@:2}"
}

Visit my page: http://www.danielkoitzsch.de/blog/2016/03/16/sudo-returns-xyz-command-not-found/

Can Android Studio be used to run standard Java projects?

It works perfect if you do File>Open... and then select pom.xml file. Be sure to change the dropdown at the top-left of the sidebar that says "Android" to "Project" to see all your files. Also I think it helps if the folder your pom.xml file is in a folder called "app/".

Disclaimer: My java project was generated by Google App Engine.

How to detect the end of loading of UITableView

To know when a table view finishes loading its content, we first need to have a basic understanding of how the views are put on screen.

In the life cycle of an app, there are 4 key moments :

The app receives an event (touch, timer, block dispatched etc)
The app handles the event (it modifies a constraint, starts an animation, changes background etc)
The app computes the new view hierarchy
The app renders the view hierarchy and displays it

The 2 and 3 times are totally separated. Why ? For performance reasons, we don't want to perform all the computations (done at 3) each time a modification is done.

So, I think you are facing a case like this :

tableView.reloadData()
tableView.visibleCells.count // wrong count oO

What’s wrong here?

A table view reloads its content lazily. Actually, if you call reloadData multiple times it won’t create performance issues. The table view only recomputes its content size based on its delegate implementation and waits the moment 3 to loads its cells. This time is called a layout pass.

Okay, how to get involved in the layout pass?

During the layout pass, the app computes all the frames of the view hierarchy. To get involved, you can override the dedicated methods layoutSubviews, updateLayoutConstraints etc in a UIView subclass and the equivalent methods in a view controller subclass.

That’s exactly what a table view does. It overrides layoutSubviews and based on your delegate implementation adds or removes cells. It calls cellForRow right before adding and laying out a new cell, willDisplay right after. If you called reloadData or just added the table view to the hierarchy, the tables view adds as many cells as necessary to fill its frame at this key moment.

Alright, but now, how to know when a tables view has finished reloading its content?

We can rephrase this question: how to know when a table view has finished laying out its subviews?

• The easiest way is to get into the layout of the table view :

class MyTableView: UITableView {
    func layoutSubviews() {
        super.layoutSubviews()
        // the displayed cells are loaded
    }
}

Note that this method is called many times in the life cycle of the table view. Because of the scroll and the dequeue behavior of the table view, cells are modified, removed and added often. But it works, right after the super.layoutSubviews(), cells are loaded. This solution is equivalent to wait the willDisplay event of the last index path. This event is called during the execution of layoutSubviews of the table view when a cell is added.

• Another way is to be notified when the app finishes a layout pass.

As described in the documentation, you can use an option of the UIView.animate(withDuration:completion):

tableView.reloadData()
UIView.animate(withDuration: 0) {
    // layout done
}

This solution works but the screen will refresh once between the time the layout is done and the time the block is executed. This is equivalent to the DispatchMain.async solution but specified.

• Alternatively, I would prefer to force the layout of the table view

There is a dedicated method to force any view to compute immediately its subview frames layoutIfNeeded:

tableView.reloadData()
table.layoutIfNeeded()
// layout done

Be careful however, doing so will remove the lazy loading used by the system. Calling those methods repeatedly could create performance issues. Make sure that they won’t be called before the frame of the table view is computed, otherwise the table view will be loaded again and you won’t be notified.

I think there is no perfect solution. Subclassing classes could lead to trubles. A layout pass starts from the top and goes to the bottom so it’s not easy to get notified when all the layout is done. And layoutIfNeeded() could create performance issues etc.

Manifest merger failed : uses-sdk:minSdkVersion 14

The problem still arises with transitive dependencies. Gradle offers a way to force the usage of a specific version of a dependency.

For example you can add something like:

configurations.all {
    resolutionStrategy {
        force 'com.android.support:support-v4:20.+'
        force 'com.android.support:appcompat-v7:20.+'
    }
}

to your build.gradle.

If you want to learn more about gradle resolution strategies refer to this guide http://www.gradle.org/docs/current/dsl/org.gradle.api.artifacts.ResolutionStrategy.html

I found this while reading the corresponding issue which I will link here

Apple Mach-O Linker Error when compiling for device

I would like to share one more reason when I got this error:

I had changed the project name in Project Navigator(in Xcode 6.1.1) by single click on it and my project would not compile. I changed the project name back to old name, project was building. Very very strange but yes I have faced this. I hope this information helps.

How do I open phone settings when a button is clicked?

As above @niravdesai said App-prefs. I found that App-Prefs: works for both iOS 9, 10 and 11. devices tested. where as prefs: only works on iOS 9.

CSS Equivalent of the "if" statement

CSS itself doesn't have conditional statements, but here's a hack involving custom properties (a.k.a. "css variables").

In this trivial example, you want to apply a padding based on a certain condition—like an "if" statement.

:root   { --is-big: 0; }

.is-big { --is-big: 1; }

.block {
  padding: calc(
    4rem * var(--is-big) +
    1rem * (1 - var(--is-big))
  );
}

So any .block that's an .is-big or that's a descendant of one will have a padding of 4rem, while all other blocks will only have 1rem. Now I call this a "trivial" example because it can be done without the hack.

.block {
  padding: 1rem;
}

.is-big .block,
.block.is-big {
  padding: 4rem;
}

But I will leave its applications to your imagination.

SQL Format as of Round off removing decimals

check the round function and how does the length argument works. It controls the behaviour of the precision of the result

How do I get formatted JSON in .NET using C#?

This worked for me. In case someone is looking for a VB.NET version.

@imports System
@imports System.IO
@imports Newtonsoft.Json

Public Shared Function JsonPrettify(ByVal json As String) As String
  Using stringReader = New StringReader(json)

    Using stringWriter = New StringWriter()
      Dim jsonReader = New JsonTextReader(stringReader)
      Dim jsonWriter = New JsonTextWriter(stringWriter) With {
          .Formatting = Formatting.Indented
      }
      jsonWriter.WriteToken(jsonReader)
      Return stringWriter.ToString()
    End Using
  End Using
End Function

How do I use variables in Oracle SQL Developer?

Try this it will work, it's better create a procedure, if procedure is not possible you can use this script.

with param AS(
SELECT 1234 empid
FROM dual)
 SELECT *
  FROM Employees, param
  WHERE EmployeeID = param.empid;
END;

Clear image on picturebox

private void ClearBtn_Click(object sender, EventArgs e)
{
    Studentpicture.Image = null;
}

Jmeter - Run .jmx file through command line and get the summary report in a excel

Running JMeter in command line mode:

1.Navigate to JMeter’s bin directory

Now enter following command,

jmeter -n –t test.jmx

-n: specifies JMeter is to run in non-gui mode

-t: specifies name of JMX file that contains the Test Plan

How to access host port from docker container

When running Docker natively on Linux, you can access host services using the IP address of the docker0 interface. From inside the container, this will be your default route.

For example, on my system:

$ ip addr show docker0
7: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default 
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0
       valid_lft forever preferred_lft forever
    inet6 fe80::f4d2:49ff:fedd:28a0/64 scope link 
       valid_lft forever preferred_lft forever

And inside a container:

# ip route show
default via 172.17.0.1 dev eth0 
172.17.0.0/16 dev eth0  src 172.17.0.4

It's fairly easy to extract this IP address using a simple shell script:

#!/bin/sh

hostip=$(ip route show | awk '/default/ {print $3}')
echo $hostip

You may need to modify the iptables rules on your host to permit connections from Docker containers. Something like this will do the trick:

# iptables -A INPUT -i docker0 -j ACCEPT

This would permit access to any ports on the host from Docker containers. Note that:

iptables rules are ordered, and this rule may or may not do the right thing depending on what other rules come before it.
you will only be able to access host services that are either (a) listening on INADDR_ANY (aka 0.0.0.0) or that are explicitly listening on the docker0 interface.

If you are using Docker on MacOS or Windows 18.03+, you can connect connect to the magic hostname host.docker.internal.

Lastly, under Linux you can run your container in the host network namespace by setting --net=host; in this case localhost on your host is the same as localhost inside the container, so containerized service will act like non-containerized services and will be accessible without any additional configuration.

Passing parameter via url to sql server reporting service

As well as what Shiraz said, try something like this:

http://<server>/ReportServer/Pages/ReportViewer.aspx?%2f<path>%2f<ReportName>&rs:Command=Render&UserID='fred'

Note the path would only work if you are in a single folder. When I have to do this I simply browse to the report using the reportserver path ("reports" is the report manager) and copy the url then add &<ParameterName>=<value> to the end.

C++ multiline string literal

Well ... Sort of. The easiest is to just use the fact that adjacent string literals are concatenated by the compiler:

const char *text =
  "This text is pretty long, but will be "
  "concatenated into just a single string. "
  "The disadvantage is that you have to quote "
  "each part, and newlines must be literal as "
  "usual.";

The indentation doesn't matter, since it's not inside the quotes.

You can also do this, as long as you take care to escape the embedded newline. Failure to do so, like my first answer did, will not compile:

const char *text2 =
  "Here, on the other hand, I've gone crazy \
and really let the literal span several lines, \
without bothering with quoting each line's \
content. This works, but you can't indent.";

Again, note those backslashes at the end of each line, they must be immediately before the line ends, they are escaping the newline in the source, so that everything acts as if the newline wasn't there. You don't get newlines in the string at the locations where you had backslashes. With this form, you obviously can't indent the text since the indentation would then become part of the string, garbling it with random spaces.

How do I run all Python unit tests in a directory?

I tried various approaches but all seem flawed or I have to makeup some code, that's annoying. But there's a convinient way under linux, that is simply to find every test through certain pattern and then invoke them one by one.

find . -name 'Test*py' -exec python '{}' \;

and most importantly, it definitely works.

What is the difference between g++ and gcc?

GCC: GNU Compiler Collection

Referrers to all the different languages that are supported by the GNU compiler.

gcc: GNU C Compiler
g++: GNU C++ Compiler

The main differences:

gcc will compile: *.c\*.cpp files as C and C++ respectively.
g++ will compile: *.c\*.cpp files but they will all be treated as C++ files.
Also if you use g++ to link the object files it automatically links in the std C++ libraries (gcc does not do this).
gcc compiling C files has fewer predefined macros.
gcc compiling *.cpp and g++ compiling *.c\*.cpp files has a few extra macros.

Extra Macros when compiling *.cpp files:

#define __GXX_WEAK__ 1
#define __cplusplus 1
#define __DEPRECATED 1
#define __GNUG__ 4
#define __EXCEPTIONS 1
#define __private_extern__ extern

How to validate domain credentials?

I`m using the following code to validate credentials. The method shown below will confirm if the credentials are correct and if not wether the password is expired or needs change.

I`ve been looking for something like this for ages... So i hope this helps someone!

using System;
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
using System.Runtime.InteropServices;

namespace User
{
    public static class UserValidation
    {
        [DllImport("advapi32.dll", SetLastError = true)]
        static extern bool LogonUser(string principal, string authority, string password, LogonTypes logonType, LogonProviders logonProvider, out IntPtr token);
        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool CloseHandle(IntPtr handle);
        enum LogonProviders : uint
        {
            Default = 0, // default for platform (use this!)
            WinNT35,     // sends smoke signals to authority
            WinNT40,     // uses NTLM
            WinNT50      // negotiates Kerb or NTLM
        }
        enum LogonTypes : uint
        {
            Interactive = 2,
            Network = 3,
            Batch = 4,
            Service = 5,
            Unlock = 7,
            NetworkCleartext = 8,
            NewCredentials = 9
        }
        public  const int ERROR_PASSWORD_MUST_CHANGE = 1907;
        public  const int ERROR_LOGON_FAILURE = 1326;
        public  const int ERROR_ACCOUNT_RESTRICTION = 1327;
        public  const int ERROR_ACCOUNT_DISABLED = 1331;
        public  const int ERROR_INVALID_LOGON_HOURS = 1328;
        public  const int ERROR_NO_LOGON_SERVERS = 1311;
        public  const int ERROR_INVALID_WORKSTATION = 1329;
        public  const int ERROR_ACCOUNT_LOCKED_OUT = 1909;      //It gives this error if the account is locked, REGARDLESS OF WHETHER VALID CREDENTIALS WERE PROVIDED!!!
        public  const int ERROR_ACCOUNT_EXPIRED = 1793;
        public  const int ERROR_PASSWORD_EXPIRED = 1330;

        public static int CheckUserLogon(string username, string password, string domain_fqdn)
        {
            int errorCode = 0;
            using (PrincipalContext pc = new PrincipalContext(ContextType.Domain, domain_fqdn, "ADMIN_USER", "PASSWORD"))
            {
                if (!pc.ValidateCredentials(username, password))
                {
                    IntPtr token = new IntPtr();
                    try
                    {
                        if (!LogonUser(username, domain_fqdn, password, LogonTypes.Network, LogonProviders.Default, out token))
                        {
                            errorCode = Marshal.GetLastWin32Error();
                        }
                    }
                    catch (Exception)
                    {
                        throw;
                    }
                    finally
                    {
                        CloseHandle(token);
                    }
                }
            }
            return errorCode;
        }
    }

How to Update Date and Time of Raspberry Pi With out Internet

You will need to configure your Win7 PC as a Time Server, and then configure the RasPi to connect to it for NTP services.

Configure Win7 as authoritative time server. Configure RasPi time server lookup.

Laravel - Model Class not found

Make sure to be careful when editing your model file. For example, in your post model:

<?php 
namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model {
    protected $table = 'posts';    
}

You need to pay close attention to the class Post extend Model line. The class Post defined here will be your namespace for your controller.

Send JavaScript variable to PHP variable

As Jordan already said you have to post back the javascript variable to your server before the server can handle the value. To do this you can either program a javascript function that submits a form - or you can use ajax / jquery. jQuery.post

Maybe the most easiest approach for you is something like this

function myJavascriptFunction() { 
  var javascriptVariable = "John";
  window.location.href = "myphpfile.php?name=" + javascriptVariable; 
}

On your myphpfile.php you can use $_GET['name'] after your javascript was executed.

Regards

jQuery - Increase the value of a counter when a button is clicked

I'm going to try this the following way. I've placed the count variable inside the "onfocus" function so as to keep it from becoming a global variable. The idea is to create a counter for each image in a tumblr blog.

$(document).ready(function() {

  $("#image1").onfocus(function() {

  var count;

    if (count == undefined || count == "" || count == 0) {
    var count = 0;
    }

    count++;
    $("#counter1").html("Image Views: " + count);
  }
});

Then, outside the script tags and in the desired place in the body I'll add:

<div id="counter1"></div>

How to get Android GPS location

Give it a try :

public LatLng getLocation()
    {
     // Get the location manager
     LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
     Criteria criteria = new Criteria();
     String bestProvider = locationManager.getBestProvider(criteria, false);
     Location location = locationManager.getLastKnownLocation(bestProvider);
     Double lat,lon;
     try {
       lat = location.getLatitude ();
       lon = location.getLongitude ();
       return new LatLng(lat, lon);
     }
     catch (NullPointerException e){
         e.printStackTrace();
       return null;
     }
    }

Bash script processing limited number of commands in parallel

You can run 20 processes and use the command:

wait

Your script will wait and continue when all your background jobs are finished.

PHP How to find the time elapsed since a date time?

Wrote my own

function getElapsedTime($eventTime)
{
    $totaldelay = time() - strtotime($eventTime);
    if($totaldelay <= 0)
    {
        return '';
    }
    else
    {
        if($days=floor($totaldelay/86400))
        {
            $totaldelay = $totaldelay % 86400;
            return $days.' days ago.';
        }
        if($hours=floor($totaldelay/3600))
        {
            $totaldelay = $totaldelay % 3600;
            return $hours.' hours ago.';
        }
        if($minutes=floor($totaldelay/60))
        {
            $totaldelay = $totaldelay % 60;
            return $minutes.' minutes ago.';
        }
        if($seconds=floor($totaldelay/1))
        {
            $totaldelay = $totaldelay % 1;
            return $seconds.' seconds ago.';
        }
    }
}

View's getWidth() and getHeight() returns 0

It happens because the view needs more time to be inflated. So instead of calling view.width and view.height on the main thread, you should use view.post { ... } to make sure that your view has already been inflated. In Kotlin:

view.post{width}
view.post{height}

In Java you can also call getWidth() and getHeight() methods in a Runnable and pass the Runnable to view.post() method.

view.post(new Runnable() {
        @Override
        public void run() {
            view.getWidth(); 
            view.getHeight();
        }
    });

What is the meaning of @_ in Perl?

Usually, you expand the parameters passed to a sub using the @_ variable:

sub test{
  my ($a, $b, $c) = @_;
  ...
}

# call the test sub with the parameters
test('alice', 'bob', 'charlie');

That's the way claimed to be correct by perlcritic.

Hibernate Delete query

instead of using

session.delete(object)

use

getHibernateTemplate().delete(object)

In both place for select query and also for delete use getHibernateTemplate()

In select query you have to use DetachedCriteria or Criteria

Example for select query

List<foo> fooList = new ArrayList<foo>();
DetachedCriteria queryCriteria = DetachedCriteria.forClass(foo.class);
queryCriteria.add(Restrictions.eq("Column_name",restriction));
fooList = getHibernateTemplate().findByCriteria(queryCriteria);

In hibernate avoid use of session,here I am not sure but problem occurs just because of session use

Can an AWS Lambda function call another

here's a sample code for python,

from boto3 import client as boto3_client
from datetime import datetime
import json

lambda_client = boto3_client('lambda')

def lambda_handler(event, context):
    msg = {"key":"new_invocation", "at": datetime.now()}
    invoke_response = lambda_client.invoke(FunctionName="another_lambda_",
                                           InvocationType='Event',
                                           Payload=json.dumps(msg))
    print(invoke_response)

Btw, you would need to add a policy like this to your lambda role as well

   {
        "Sid": "Stmt1234567890",
        "Effect": "Allow",
        "Action": [
            "lambda:InvokeFunction"
        ],
        "Resource": "*"
    }

JavaScript, get date of the next day

Using Date object guarantees that. For eg if you try to create April 31st :

new Date(2014,3,31)        // Thu May 01 2014 00:00:00

Please note that it's zero indexed, so Jan. is 0, Feb. is 1 etc.

How to convert an Stream into a byte[] in C#?

The shortest solution I know:

using(var memoryStream = new MemoryStream())
{
  sourceStream.CopyTo(memoryStream);
  return memoryStream.ToArray();
}

Warning: mysql_connect(): Access denied for user 'root'@'localhost' (using password: YES)

try $conn = mysql_connect("localhost", "root") or $conn = mysql_connect("localhost", "root", "")

NewtonSoft.Json Serialize and Deserialize class with property of type IEnumerable<ISomeInterface>

Having that:

public interface ITerm
{
    string Name { get; }
}

public class Value : ITerm...

public class Variable : ITerm...

public class Query
{
   public IList<ITerm> Terms { get; }
...
}

I managed conversion trick implementing that:

public class TermConverter : JsonConverter
{
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        var field = value.GetType().Name;
        writer.WriteStartObject();
        writer.WritePropertyName(field);
        writer.WriteValue((value as ITerm)?.Name);
        writer.WriteEndObject();
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
        JsonSerializer serializer)
    {
        var jsonObject = JObject.Load(reader);
        var properties = jsonObject.Properties().ToList();
        var value = (string) properties[0].Value;
        return properties[0].Name.Equals("Value") ? (ITerm) new Value(value) : new Variable(value);
    }

    public override bool CanConvert(Type objectType)
    {
        return typeof (ITerm) == objectType || typeof (Value) == objectType || typeof (Variable) == objectType;
    }
}

It allows me to serialize and deserialize in JSON like:

string JsonQuery = "{\"Terms\":[{\"Value\":\"This is \"},{\"Variable\":\"X\"},{\"Value\":\"!\"}]}";
...
var query = new Query(new Value("This is "), new Variable("X"), new Value("!"));
var serializeObject = JsonConvert.SerializeObject(query, new TermConverter());
Assert.AreEqual(JsonQuery, serializeObject);
...
var queryDeserialized = JsonConvert.DeserializeObject<Query>(JsonQuery, new TermConverter());

iOS how to set app icon and launch images

To save a bit time:

1) You can mark your app icon images all in finder and drag them into your Assets catalog all at once by dragging into one of the empty slots of the app icon imageset. When you hold your drag over the slot, several of the other slots look selected and when you drop those all will be filled up at once. Note that this works in XCode 8 (I haven't tried XCode 7), but in XCode 9 beta not yet.

Dragging into app icon Asset catalog imageset

2) The "Technical Q&A QA1686" apple documentation site has the sizes per app icon slot already calculated for you in a nice image and also contains the correct image names conventions.

Testing web application on Mac/Safari when I don't own a Mac

https://appetize.io/demo?device=iphone8&scale=75&orientation=portrait&osVersion=13.3 60 seconds is enought for test. Isn't need to register account to.

What is a good Hash Function?

For doing "normal" hash table lookups on basically any kind of data - this one by Paul Hsieh is the best I've ever used.

http://www.azillionmonkeys.com/qed/hash.html

If you care about cryptographically secure or anything else more advanced, then YMMV. If you just want a kick ass general purpose hash function for a hash table lookup, then this is what you're looking for.

MySQL the right syntax to use near '' at line 1 error

INSERT INTO wp_bp_activity
            (
            user_id,
             component,
             `type`,
             `action`,
             content,
             primary_link,
             item_id,
             secondary_item_id,
             date_recorded,
             hide_sitewide,
             mptt_left,
             mptt_right
             )
             VALUES(
             1,'activity','activity_update','<a title="admin" href="http://brandnewmusicreleases.com/social-network/members/admin/">admin</a> posted an update','<a title="242925_1" href="http://brandnewmusicreleases.com/social-network/wp-content/uploads/242925_1.jpg" class="buddyboss-pics-picture-link">242925_1</a>','http://brandnewmusicreleases.com/social-network/members/admin/',' ',' ','2012-06-22 12:39:07',0,0,0
             )

How to round a number to significant figures in Python

I modified indgar's solution to handle negative numbers and small numbers (including zero).

from math import log10, floor
def round_sig(x, sig=6, small_value=1.0e-9):
    return round(x, sig - int(floor(log10(max(abs(x), abs(small_value))))) - 1)

Jenkins: Cannot define variable in pipeline stage

In Jenkins 2.138.3 there are two different types of pipelines.

Declarative and Scripted pipelines.

"Declarative pipelines is a new extension of the pipeline DSL (it is basically a pipeline script with only one step, a pipeline step with arguments (called directives), these directives should follow a specific syntax. The point of this new format is that it is more strict and therefore should be easier for those new to pipelines, allow for graphical editing and much more. scripted pipelines is the fallback for advanced requirements."

jenkins pipeline: agent vs node?

Here is an example of using environment and global variables in a Declarative Pipeline. From what I can tell enviroment are static after they are set.

def  browser = 'Unknown'

pipeline {
    agent any
    environment {
    //Use Pipeline Utility Steps plugin to read information from pom.xml into env variables
    IMAGE = readMavenPom().getArtifactId()
    VERSION = readMavenPom().getVersion()


    }
    stages {
        stage('Example') {
            steps {
                script {
                    browser = sh(returnStdout: true, script: 'echo Chrome')
                }
            }
        }
        stage('SNAPSHOT') {
                when {
                    expression { 
                        return !env.JOB_NAME.equals("PROD") && !env.VERSION.contains("RELEASE")
                    }
                }
                steps {
                    echo "SNAPSHOT"
                    echo "${browser}"
                }
            }
            stage('RELEASE') {
                when {
                    expression { 
                        return !env.JOB_NAME.equals("TEST") && !env.VERSION.contains("RELEASE")
                    }
                }
                steps {
                    echo "RELEASE"
                    echo "${browser}"
                }
            }
    }//end of stages 
}//end of pipeline

How to convert integer to string in C?

Use sprintf():

int someInt = 368;
char str[12];
sprintf(str, "%d", someInt);

All numbers that are representable by int will fit in a 12-char-array without overflow, unless your compiler is somehow using more than 32-bits for int. When using numbers with greater bitsize, e.g. long with most 64-bit compilers, you need to increase the array size—at least 21 characters for 64-bit types.

What does the 'u' symbol mean in front of string values?

This is a feature, not a bug.

See http://docs.python.org/howto/unicode.html, specifically the 'unicode type' section.

Regular Expression: Allow letters, numbers, and spaces (with at least one letter or number)

^[ _]*[A-Z0-9][A-Z0-9 _]*$

You can optionally have some spaces or underscores up front, then you need one letter or number, and then an arbitrary number of numbers, letters, spaces or underscores after that.

Something that contains only spaces and underscores will fail the [A-Z0-9] portion.

Add newly created specific folder to .gitignore in Git

For this there are two cases

Case 1: File already added to git repo.

Case 2: File newly created and its status still showing as untracked file when using

git status

If you have case 1:

STEP 1: Then run

git rm --cached filename

to remove it from git repo cache

if it is a directory then use

git rm -r --cached  directory_name

STEP 2: If Case 1 is over then create new file named .gitignore in your git repo

STEP 3: Use following to tell git to ignore / assume file is unchanged

git update-index --assume-unchanged path/to/file.txt

STEP 4: Now, check status using git status open .gitignore in your editor nano, vim, geany etc... any one, add the path of the file / folder to ignore. If it is a folder then user folder_name/* to ignore all file.

If you still do not understand read the article git ignore file link.

Convert milliseconds to date (in Excel)

See Converting unix timestamp to excel date-time forum thread.

Shall we always use [unowned self] inside closure in Swift

If none of the above makes sense:

tl;dr

Just like an implicitly unwrapped optional, If you can guarantee that the reference will not be nil at its point of use, use unowned. If not, then you should be using weak.

Explanation:

I retrieved the following below at: weak unowned link. From what I gathered, unowned self can't be nil but weak self can be, and unowned self can lead to dangling pointers...something infamous in Objective-C. Hope it helps

"UNOWNED Weak and unowned references behave similarly but are NOT the same."

Unowned references, like weak references, do not increase the retain count of the object being referred. However, in Swift, an unowned reference has the added benefit of not being an Optional. This makes them easier to manage rather than resorting to using optional binding. This is not unlike Implicitly Unwrapped Optionals . In addition, unowned references are non-zeroing. This means that when the object is deallocated, it does not zero out the pointer. This means that use of unowned references can, in some cases, lead to dangling pointers. For you nerds out there that remember the Objective-C days like I do, unowned references map to unsafe_unretained references.

This is where it gets a little confusing.

Weak and unowned references both do not increase retain counts.

They can both be used to break retain cycles. So when do we use them?!

According to Apple's docs:

“Use a weak reference whenever it is valid for that reference to become nil at some point during its lifetime. Conversely, use an unowned reference when you know that the reference will never be nil once it has been set during initialisation.”

Eclipse Workspaces: What for and why?

Basically the scope of workspace(s) is divided in two points.

First point (and primary) is the eclipse it self and is related with the settings and metadata configurations (plugin ctr). Each time you create a project, eclipse collects all the configurations and stores them on that workspace and if somehow in the same workspace a conflicting project is present you might loose some functionality or even stability of eclipse it self.

And second (secondary) the point of development strategy one can adopt. Once the primary scope is met (and mastered) and there's need for further adjustments regarding project relations (as libraries, perspectives ctr) then initiate separate workspace(s) could be appropriate based on development habits or possible language/frameworks "behaviors". DLTK for examples is a beast that should be contained in a separate cage. Lots of complains at forums for it stopped working (properly or not at all) and suggested solution was to clean the settings of the equivalent plugin from the current workspace.

Personally, I found myself lean more to language distinction when it comes to separate workspaces which is relevant to known issues that comes with the current state of the plugins are used. Preferably I keep them in the minimum numbers as this is leads to less frustration when the projects are become... plenty and version control is not the only version you keep your projects. Finally, loading speed and performance is an issue that might come up if lots of (unnecessary) plugins are loaded due to presents of irrelevant projects. Bottom line; there is no one solution to every one, no master blue print that solves the issue. It's something that grows with experience, Less is more though!

How to get the version of ionic framework?

on your terminal run this command on your ionic project folder ionic info and you will get the following :

cli packages: (/usr/local/lib/node_modules)

    @ionic/cli-utils  : 1.19.2
    ionic (Ionic CLI) : 3.20.0

global packages:

    cordova (Cordova CLI) : 8.0.0

local packages:

    @ionic/app-scripts : 3.1.8
    Cordova Platforms  : android 7.0.0 ios 4.5.5
    Ionic Framework    : ionic-angular 3.9.2

System:

    Node  : v8.9.3
    npm   : 6.1.0
    OS    : macOS
    Xcode : Xcode 10.1 Build version 10B61

Environment Variables:

    ANDROID_HOME : not set

Misc:

    backend : pro

Android Studio how to run gradle sync manually?

I think ./gradlew tasks is same with Android studio sync. Why? I will explain it.

I meet a problem when I test jacoco coverage report. When I run ./gradlew clean :Test:testDebugUnitTest in command line directly , error appear.

Error opening zip file or JAR manifest missing : build/tmp/expandedArchives/org.jacoco.agent-0.8.2.jar_5bdiis3s7lm1rcnv0gawjjfxc/jacocoagent.jar

However, if I click android studio sync firstly , it runs OK. Because the build/../jacocoagent.jar appear naturally. I dont know why, maybe there is bug in jacoco plugin. Unit I find running .gradlew tasks makes the jar appear as well. So I can get the same result in gralde script.

Besides, gradle --recompile-scripts does not work for the problem.

Determine the line of code that causes a segmentation fault?

Also, you can give valgrind a try: if you install valgrind and run

valgrind --leak-check=full <program>

then it will run your program and display stack traces for any segfaults, as well as any invalid memory reads or writes and memory leaks. It's really quite useful.

How to add 'libs' folder in Android Studio?

also you should click right button on mouse at your projectname and choose "open module settings" or press F4 button. Then on "dependencies" tab add your lib.jar to declare needed lib

WPF - add static items to a combo box

<ComboBox Text="Something">
            <ComboBoxItem Content="Item1"></ComboBoxItem >
            <ComboBoxItem Content="Item2"></ComboBoxItem >
            <ComboBoxItem Content="Item3"></ComboBoxItem >
</ComboBox>

How do you run a command for each line of a file?

If you know you don't have any whitespace in the input:

xargs chmod 755 < file.txt

If there might be whitespace in the paths, and if you have GNU xargs:

tr '\n' '\0' < file.txt | xargs -0 chmod 755

React Native fetch() Network Request Failed

You can handle it using this :

catch((error) => {
      this.setState({
        typing_animation_button: false,
      });
      console.log(error);
      if ('Timeout' || 'Network request failed') {
        toast_show = true;
        toast_type = 'error';
        toast_text = 'Network failure';
      }
      this.setState({
        disable_button: false,
      });
    });

How to access property of anonymous type in C#?

You could iterate over the anonymous type's properties using Reflection; see if there is a "Checked" property and if there is then get its value.

See this blog post: http://blogs.msdn.com/wriju/archive/2007/10/26/c-3-0-anonymous-type-and-net-reflection-hand-in-hand.aspx

So something like:

foreach(object o in nodes)
{
    Type t = o.GetType();

    PropertyInfo[] pi = t.GetProperties(); 

    foreach (PropertyInfo p in pi)
    {
        if (p.Name=="Checked" && !(bool)p.GetValue(o))
            Console.WriteLine("awesome!");
    }
}

Difference between innerText, innerHTML and value?

InnerText property html-encodes the content, turning <p> to <p>, etc. If you want to insert HTML tags you need to use InnerHTML.

Convert string to int array using LINQ

s1.Split(';').Select(s => Convert.ToInt32(s)).ToArray();

~~Untested and off the top of my head...testing now for correct syntax.~~

Tested and everything looks good.

Why can't I define a default constructor for a struct in .NET?

You can make a static property that initializes and returns a default "rational" number:

public static Rational One => new Rational(0, 1);

And use it like:

var rat = Rational.One;

How do you remove a specific revision in the git history?

I also landed in a similar situation. Use interactive rebase using the command below and while selecting, drop 3rd commit.

git rebase -i remote/branch

What is the correct wget command syntax for HTTPS with username and password?

I have found that wget does not properly authenticate with some servers, perhaps because it is only HTTP 1.0 compliant. In such cases, curl (which is HTTP 1.1 compliant) usually does the trick:

curl -o <filename-to-save-as> -u <username>:<password> <url>

How do you do a deep copy of an object in .NET?

The best way is:

    public interface IDeepClonable<T> where T : class
    {
        T DeepClone();
    }

    public class MyObj : IDeepClonable<MyObj>
    {
        public MyObj Clone()
        {
            var myObj = new MyObj();
            myObj._field1 = _field1;//value type
            myObj._field2 = _field2;//value type
            myObj._field3 = _field3;//value type

            if (_child != null)
            {
                myObj._child = _child.DeepClone(); //reference type .DeepClone() that does the same
            }

            int len = _array.Length;
            myObj._array = new MyObj[len]; // array / collection
            for (int i = 0; i < len; i++)
            {
                myObj._array[i] = _array[i];
            }

            return myObj;
        }

        private bool _field1;
        public bool Field1
        {
            get { return _field1; }
            set { _field1 = value; }
        }

        private int _field2;
        public int Property2
        {
            get { return _field2; }
            set { _field2 = value; }
        }

        private string _field3;
        public string Property3
        {
            get { return _field3; }
            set { _field3 = value; }
        }

        private MyObj _child;
        private MyObj Child
        {
            get { return _child; }
            set { _child = value; }
        }

        private MyObj[] _array = new MyObj[4];
    }

Practical uses for the "internal" keyword in C#

This example contains two files: Assembly1.cs and Assembly2.cs. The first file contains an internal base class, BaseClass. In the second file, an attempt to instantiate BaseClass will produce an error.

// Assembly1.cs
// compile with: /target:library
internal class BaseClass 
{
   public static int intM = 0;
}

// Assembly1_a.cs
// compile with: /reference:Assembly1.dll
class TestAccess 
{
   static void Main()
   {  
      BaseClass myBase = new BaseClass();   // CS0122
   }
}

In this example, use the same files you used in example 1, and change the accessibility level of BaseClass to public. Also change the accessibility level of the member IntM to internal. In this case, you can instantiate the class, but you cannot access the internal member.

// Assembly2.cs
// compile with: /target:library
public class BaseClass 
{
   internal static int intM = 0;
}

// Assembly2_a.cs
// compile with: /reference:Assembly1.dll
public class TestAccess 
{
   static void Main() 
   {      
      BaseClass myBase = new BaseClass();   // Ok.
      BaseClass.intM = 444;    // CS0117
   }
}

source: http://msdn.microsoft.com/en-us/library/7c5ka91b(VS.80).aspx

keypress, ctrl+c (or some combo like that)

As of 2019, this works (in Chrome at least)

$(document).keypress(function(e) {
    var key = (event.which || event.keyCode) ;
  if(e.ctrlKey) {
        if (key == 26) { console.log('Ctrl+Z was pressed') ; }
        else if (key == 25) { console.log('Ctrl+Y was pressed') ; }
        else if (key == 19) { console.log('Ctrl+S was pressed') ; }
    else { console.log('Ctrl', key, 'was pressed') ; }
    }
});

How to add action listener that listens to multiple buttons

There are good answers here but let me address the more global point of adding action listener that listens to multiple buttons.

There are two popular approaches.

Using a Common Action Listener

You can get the source of the action in your actionPerformed(ActionEvent e) implementation:

JButton button1, button2; //your button

@Override
public void actionPerformed(ActionEvent e) {

    JButton actionSource = (JButton) e.getSource();

    if(actionSource.equals(button1)){
        // YOU BUTTON 1 CODE HERE
    } else if (actionSource.equals(button2)) {
        // YOU BUTTON 2 CODE HERE
    }
}

Using ActionCommand

With this approach you setting the actionCommand field of your button which later will allow you to use switch:

button1.setActionCommand("actionName1");
button2.setActionCommand("actionName2");

And later:

@Override
public void actionPerformed(ActionEvent e) {
    String actionCommand = ((JButton) e.getSource()).getActionCommand();

    switch (actionCommand) {
        case "actionName1": 
            // YOU BUTTON 1 CODE HERE
        break;
        case "actionName2": 
            // YOU BUTTON 2 CODE HERE
        break;
    }
}

Check out to learn more about JFrame Buttons, Listeners and Fields.

How to escape regular expression special characters using javascript?

With \ you escape special characters

Escapes special characters to literal and literal characters to special.

E.g: /$s$/ matches '(s)' while /(\s)/ matches any whitespace and captures the match.

Source: http://www.javascriptkit.com/javatutors/redev2.shtml

How can I print out all possible letter combinations a given phone number can represent?

I've implemented a cache which helped to reduce number of recursions. This cache will avoid scanning of letters that it had already done for previous combinations. For one instance it was going for 120k loops, after cache implementation it got reduced to 40k.

private List<String> generateWords(String phoneNumber) {

    List<String> words = new LinkedList<String>();
    List<String> wordsCache = new LinkedList<String>();

    this.generatePossibleWords("", phoneNumber, words, wordsCache);

    return words;
}

private void generatePossibleWords(String prefix, String remainder,
    List<String> words, List<String> wordsCache) {

    int index = Integer.parseInt(remainder.substring(0, 1));

    for (int i = 0; i < phoneKeyMapper.get(index).size(); i++) {

        String mappedChar = phoneKeyMapper.get(index).get(i);

        if (prefix.equals("") && !wordsCache.isEmpty()) {

            for (String word : wordsCache) {
                words.add(mappedChar + word);
            }
        } else {

            if (remainder.length() == 1) {
                String stringToBeAdded = prefix + mappedChar;
                words.add(stringToBeAdded);
                wordsCache.add(stringToBeAdded.substring(1));
                LOGGER.finest("adding stringToBeAdded = " + stringToBeAdded.substring(1));

            } else {
                generatePossibleWords(prefix + mappedChar,
                remainder.substring(1), words, wordsCache);
            }
        }
    }
}

private void createPhoneNumberMapper() {

    if (phoneKeyMapper == null) {

    phoneKeyMapper = new ArrayList<>();
    phoneKeyMapper.add(0, new ArrayList<String>());
    phoneKeyMapper.add(1, new ArrayList<String>());

    phoneKeyMapper.add(2, new ArrayList<String>());
    phoneKeyMapper.get(2).add("A");
    phoneKeyMapper.get(2).add("B");
    phoneKeyMapper.get(2).add("C");

    phoneKeyMapper.add(3, new ArrayList<String>());
    phoneKeyMapper.get(3).add("D");
    phoneKeyMapper.get(3).add("E");
    phoneKeyMapper.get(3).add("F");

    phoneKeyMapper.add(4, new ArrayList<String>());
    phoneKeyMapper.get(4).add("G");
    phoneKeyMapper.get(4).add("H");
    phoneKeyMapper.get(4).add("I");

    phoneKeyMapper.add(5, new ArrayList<String>());
    phoneKeyMapper.get(5).add("J");
    phoneKeyMapper.get(5).add("K");
    phoneKeyMapper.get(5).add("L");

    phoneKeyMapper.add(6, new ArrayList<String>());
    phoneKeyMapper.get(6).add("M");
    phoneKeyMapper.get(6).add("N");
    phoneKeyMapper.get(6).add("O");

    phoneKeyMapper.add(7, new ArrayList<String>());
    phoneKeyMapper.get(7).add("P");
    phoneKeyMapper.get(7).add("Q");
    phoneKeyMapper.get(7).add("R");
    phoneKeyMapper.get(7).add("S");

    phoneKeyMapper.add(8, new ArrayList<String>());
    phoneKeyMapper.get(8).add("T");
    phoneKeyMapper.get(8).add("U");
    phoneKeyMapper.get(8).add("V");

    phoneKeyMapper.add(9, new ArrayList<String>());
    phoneKeyMapper.get(9).add("W");
    phoneKeyMapper.get(9).add("X");
    phoneKeyMapper.get(9).add("Y");
    phoneKeyMapper.get(9).add("Z");
    }
}

How do I check that multiple keys are in a dict in a single pass?

Using sets:

if set(("foo", "bar")).issubset(foo):
    #do stuff

Alternatively:

if set(("foo", "bar")) <= set(foo):
    #do stuff

Bootstrap 4 card-deck with number of columns based on viewport

This answer is for those who are using Bootstrap 4.1+ and for those who care about IE 11 as well

Card-deck does not adapt the number visible of cards according to the viewport size.

Above methods work but do not support IE. With the below method, you can achieve similar functionality and responsive cards.

You can manage the number of cards to show/hide in different breakpoints.

In Bootstrap 4.1+ columns are same height by default, just make sure your card/content uses all available space. Run the snippet, you'll understand

_x000D_

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
_x000D_
<div class="container">_x000D_
    <div class="row">_x000D_
        <div class="col-sm-6 col-lg-4 mb-3">_x000D_
            <div class="card mb-3 h-100">_x000D_
_x000D_
                <div class="card-body">_x000D_
                    <h5 class="card-title">Card title</h5>_x000D_
                    <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>_x000D_
                    <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>_x000D_
                </div>_x000D_
            </div>_x000D_
        </div>_x000D_
        <div class="col-sm-6 col-lg-4 mb-3">_x000D_
            <div class="card mb-3 h-100">_x000D_
                <div class="card-body">_x000D_
                    <h5 class="card-title">Card title</h5>_x000D_
                    <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>_x000D_
                    <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>_x000D_
                </div>_x000D_
            </div>_x000D_
        </div>_x000D_
        <div class="col-sm-6 col-lg-4 mb-3">_x000D_
            <div class="card mb-3 h-100">_x000D_
                <div class="card-body">_x000D_
                    <h5 class="card-title">Card title</h5>_x000D_
                    <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>_x000D_
                    <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>_x000D_
                </div>_x000D_
            </div>_x000D_
        </div>_x000D_
    </div>_x000D_
</div>

_x000D_

Eclipse: Set maximum line length for auto formatting?

Line length formatter setup is blocked for annotations (Eclipse Photon checked). Therefore it is needed in Line Wrapping -> Wrapping settings -> Annotations. Setup line wrapping as appropriate for you. There is couple of possibilities, e.q. Enable wrap when necessary to use first icon list.

adding 30 minutes to datetime php/mysql

Try this one

DATE_ADD(datefield, INTERVAL 30 MINUTE)

Ignore fields from Java object dynamically while sending as JSON from Spring MVC

This is a clean utility tool for the above answer :

@GetMapping(value = "/my-url")
public @ResponseBody
MappingJacksonValue getMyBean() {
    List<MyBean> myBeans = Service.findAll();
    MappingJacksonValue mappingValue = MappingFilterUtils.applyFilter(myBeans, MappingFilterUtils.JsonFilterMode.EXCLUDE_FIELD_MODE, "MyFilterName", "myBiggerObject.mySmallerObject.mySmallestObject");
    return mappingValue;
}

//AND THE UTILITY CLASS
public class MappingFilterUtils {

    public enum JsonFilterMode {
        INCLUDE_FIELD_MODE, EXCLUDE_FIELD_MODE
    }
    public static MappingJacksonValue applyFilter(Object object, final JsonFilterMode mode, final String filterName, final String... fields) {
        if (fields == null || fields.length == 0) {
            throw new IllegalArgumentException("You should pass at least one field");
        }
        return applyFilter(object, mode, filterName, new HashSet<>(Arrays.asList(fields)));
    }

    public static MappingJacksonValue applyFilter(Object object, final JsonFilterMode mode, final String filterName, final Set<String> fields) {
        if (fields == null || fields.isEmpty()) {
            throw new IllegalArgumentException("You should pass at least one field");
        }

        SimpleBeanPropertyFilter filter = null;
        switch (mode) {
            case EXCLUDE_FIELD_MODE:
                filter = SimpleBeanPropertyFilter.serializeAllExcept(fields);
                break;
            case INCLUDE_FIELD_MODE:
                filter = SimpleBeanPropertyFilter.filterOutAllExcept(fields);
                break;
        }

        FilterProvider filters = new SimpleFilterProvider().addFilter(filterName, filter);
        MappingJacksonValue mapping = new MappingJacksonValue(object);
        mapping.setFilters(filters);
        return mapping;
    }
}

Get current date, given a timezone in PHP?

<?php
date_default_timezone_set('GMT-5');//Set New York timezone
$today = date("F j, Y")
?>

AngularJs directive not updating another directive's scope

Just wondering why you are using 2 directives?

It seems like, in this case it would be more straightforward to have a controller as the parent - handle adding the data from your service to its $scope, and pass the model you need from there into your warrantyDirective.

Or for that matter, you could use 0 directives to achieve the same result. (ie. move all functionality out of the separate directives and into a single controller).

It doesn't look like you're doing any explicit DOM transformation here, so in this case, perhaps using 2 directives is overcomplicating things.

Alternatively, have a look at the Angular documentation for directives: http://docs.angularjs.org/guide/directive The very last example at the bottom of the page explains how to wire up dependent directives.

ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'

I had the command correct per above answers, what I missed on was on the Workbench, where we mention 'Limit Connectivity from Host' for the user, it defaults to "%" - change this to "localhost" and it connects fine thereafter!

How to make a smooth image rotation in Android?

No matter what I tried, I couldn't get this to work right using code (and setRotation) for smooth rotation animation. What I ended up doing was making the degree changes so small, that the small pauses are unnoticeable. If you don't need to do too many rotations, the time to execute this loop is negligible. The effect is a smooth rotation:

        float lastDegree = 0.0f;
        float increment = 4.0f;
        long moveDuration = 10;
        for(int a = 0; a < 150; a++)
        {
            rAnim = new RotateAnimation(lastDegree, (increment * (float)a),  Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
            rAnim.setDuration(moveDuration);
            rAnim.setStartOffset(moveDuration * a);
            lastDegree = (increment * (float)a);
            ((AnimationSet) animation).addAnimation(rAnim);
        }

How to redirect single url in nginx?

If you need to duplicate more than a few redirects, you might consider using a map:

# map is outside of server block
map $uri $redirect_uri {
    ~^/issue1/?$    http://example.com/shop/issues/custom_isse_name1;
    ~^/issue2/?$    http://example.com/shop/issues/custom_isse_name2;
    ~^/issue3/?$    http://example.com/shop/issues/custom_isse_name3;
    # ... or put these in an included file
}

location / {
    try_files $uri $uri/ @redirect-map;
}

location @redirect-map {
    if ($redirect_uri) {  # redirect if the variable is defined
        return 301 $redirect_uri;
    }
}

Sys is undefined

Make sure that any client scripts you have that interact with .NET AJAX have the following line at the end:

if (typeof(Sys) !== 'undefined')  Sys.Application.notifyScriptLoaded();

This tells the script manager that the whole script file has loaded and that it can begin to call client methods

What is the best way to get the minimum or maximum value from an Array of numbers?

Please take into account that sorting the array will only be faster that looping up to certain size of the array. If your array is small (and it will be like that any time) then your solution is perfectly fine. But if it might get too large you should use a conditional to use the sort approach when the array is small, and the normal iteration when it is too large

Does return stop a loop?

This code will exit the loop after the first iteration in a for of loop:

const objc = [{ name: 1 }, { name: 2 }, { name: 3 }];
for (const iterator of objc) {
  if (iterator.name == 2) {
    return;
  }
  console.log(iterator.name);// 1
}

the below code will jump on the condition and continue on a for of loop:

const objc = [{ name: 1 }, { name: 2 }, { name: 3 }];

for (const iterator of objc) {
  if (iterator.name == 2) {
    continue;
  }
  console.log(iterator.name); // 1  , 3
}

Ant build failed: "Target "build..xml" does not exist"

since your ant file's name is build.xml, you should just type ant without ant build.xml. that is: > ant [enter]

How to connect to SQL Server from another computer?

I'll edit my previous answer based on further info supplied. You can clearely ping the remote computer as you can use terminal services.

I've a feeling that port 1433 is being blocked by a firewall, hence your trouble. See TCP Ports Needed for Communication to SQL Server Through a Firewall by Microsoft.

Try using this application to ping your servers ip address and port 1433.

tcping your.server.ip.address 1433

And see if you get a "Port is open" response from tcping.

Ok, next to try is to check SQL Server. RDP onto the SQL Server computer. Start SSMS. Connect to the database. In object explorer (usually docked on the left) right click on the server and click properties.

alt text http://www.hicrest.net/server_prop_menu.jpg

Goto the Connections settings and make sure "Allow remote connections to this server" is ticket.

alt text http://www.hicrest.net/server_properties.jpg

git ignore all files of a certain type, except those in a specific subfolder

An optional prefix ! which negates the pattern; any matching file excluded by a previous pattern will become included again. If a negated pattern matches, this will override lower precedence patterns sources.

http://schacon.github.com/git/gitignore.html

*.json
!spec/*.json

Command for restarting all running docker containers?

To start multiple containers with the only particular container id's $ docker restart contianer-id1 container-id2 container-id3 ...

Close pre-existing figures in matplotlib when running from eclipse

You can close a figure by calling matplotlib.pyplot.close, for example:

from numpy import *
import matplotlib.pyplot as plt
from scipy import *

t = linspace(0, 0.1,1000)
w = 60*2*pi


fig = plt.figure()
plt.plot(t,cos(w*t))
plt.plot(t,cos(w*t-2*pi/3))
plt.plot(t,cos(w*t-4*pi/3))
plt.show()
plt.close(fig)

You can also close all open figures by calling matplotlib.pyplot.close("all")

All ASP.NET Web API controllers return 404

WebApiConfig.Register(GlobalConfiguration.Configuration);

Should be first in App_start event. I have tried it at last position in APP_start event, but that did not work.

Pass variables to AngularJS controller, best practice?

You could use ng-init in an outer div:

<div ng-init="param='value';">
    <div ng-controller="BasketController" >
        <label>param: {{value}}</label>
    </div>
</div>

The parameter will then be available in your controller's scope:

function BasketController($scope) {
        console.log($scope.param);
}

How to create duplicate table with new name in SQL Server 2008

SELECT * INTO table2 FROM table1;

Display loading image while post with ajax

$.ajax(
{
    type: 'post',
    url: 'mail.php',
    data: form.serialize(),
    beforeSend: function()
    {
        $('.content').html('loading...');
    },
    success: function(data)
    {
        $('.content').html(data);
    },
    error: function()
    {
        $('.content').html('error');
    }
});

have fun playing arround!

if you should have quick loading times which prevent te loading showing, you can add a timeout of some sort.

How to install an apk on the emulator in Android Studio?

For Linux: once emulator is running, the following worked for me.

Because I installed the Android SDK on my home directory, I have the following file structure:

home/Android/Sdk/platform-tools/adb
home/AndroidStudioProjects/Metronome.adk

AndroidStudioProjects is a file folder I made for my Android projects. "Metronome.adk" is the file I want to run.

So, using Terminal from the home directory...

./Android/Sdk/platform-tools/adb install ./AndroidStudioProjects/Metronome.adk

Being a Linux novice, I often forget the need to put the "./" in when trying to locate a file or run a command.

After the command achieves "Success", the app is in the Apps area of the emulator and can be run.

Restricting JTextField input to Integers

When you type integer numbers to JtextField1 after key release it will go to inside try , for any other character it will throw NumberFormatException. If you set empty string to jTextField1 inside the catch so the user cannot type any other keys except positive numbers because JTextField1 will be cleared for each bad attempt.

 //Fields 
int x;
JTextField jTextField1;

 //Gui Code Here

private void jTextField1KeyReleased(java.awt.event.KeyEvent evt) {                                        
    try {
        x = Integer.parseInt(jTextField1.getText());
    } catch (NumberFormatException nfe) {
        jTextField1.setText("");
    }
}

How to comment multiple lines with space or indent

One way to do it would be:

Select the text, Press CTRL + K, C to comment (CTRL+E+C )
Move the cursor to the first line after the delimiter // and before the Code text.
Press Alt + Shift and use arrow keys to make selection. (Remember to make line selection(using down, up arrow keys), not the text selection - See Box Selection and Multi line editing)
Once the selection is done, press space bar to enter a single space.

Notice the vertical blue line in the below image( that will appear once the selection is made, then you can insert any number of characters in between them)

enter image description here

I couldn't find a direct way to do that. The interesting thing is that it is mentioned in the C# Coding Conventions (C# Programming Guide) under Commenting Conventions.

Insert one space between the comment delimiter (//) and the comment text

But the default implementation of commenting in visual studio doesn't insert any space

How to configure WAMP (localhost) to send email using Gmail?

use stunnel on your server, to send with gmail. google it.

Iterate through Nested JavaScript Objects

var findObjectByLabel = function(obj, label) 
{
  var foundLabel=null;
  if(obj.label === label)
  { 
    return obj; 
  }

for(var i in obj) 
{
    if(Array.isArray(obj[i])==true)
    {
        for(var j=0;j<obj[i].length;j++)
        {
            foundLabel = findObjectByLabel(obj[i], label);
        }
    }
    else if(typeof(obj[i])  == 'object')
    {
        if(obj.hasOwnProperty(i))
        {           
            foundLabel = findObjectByLabel(obj[i], label);     
        }       
    }

    if(foundLabel) 
    { 
        return foundLabel; 
    }

}

return null;
};

var x = findObjectByLabel(cars, "Sedan");
alert(JSON.stringify(x));

PHP upload image

  <?php 
 $target_dir = "images/";
    echo $target_file = $target_dir . basename($_FILES["image"]["name"]);
    $post_tmp_img = $_FILES["image"]["tmp_name"];
    $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
    $post_imag = $_FILES["image"]["name"];
        move_uploaded_file($post_tmp_img,"../images/$post_imag");
 ?>

How to parse JSON data with jQuery / JavaScript?

Try following code, it works in my project:

//start ajax request
$.ajax({
    url: "data.json",
    //force to handle it as text
    dataType: "text",
    success: function(data) {

        //data downloaded so we call parseJSON function 
        //and pass downloaded data
        var json = $.parseJSON(data);
        //now json variable contains data in json format
        //let's display a few items
        for (var i=0;i<json.length;++i)
        {
            $('#results').append('<div class="name">'+json[i].name+'</>');
        }
    }
});

Adding a new line/break tag in XML

just simply press enter it make a break

<![CDATA[this is
my text.]]>

How do I import a .bak file into Microsoft SQL Server 2012?

You can use the following script if you don't wish to use Wizard;

RESTORE DATABASE myDB
FROM  DISK = N'C:\BackupDB.bak' 
WITH  REPLACE,RECOVERY,  
MOVE N'HRNET' TO N'C:\MSSQL\Data\myDB.mdf',  
MOVE N'HRNET_LOG' TO N'C:\MSSQL\Data\myDB.ldf'

How can I solve equations in Python?

Use a different tool. Something like Wolfram Alpha, Maple, R, Octave, Matlab or any other algebra software package.

As a beginner you should probably not attempt to solve such a non-trivial problem.

What is the difference between square brackets and parentheses in a regex?

The first 2 examples act very differently if you are REPLACING them by something. If you match on this:

str = str.replace(/^(7|8|9)/ig,'');

you would replace 7 or 8 or 9 by the empty string.

If you match on this

str = str.replace(/^[7|8|9]/ig,'');

you will replace 7 or 8 or 9 OR THE VERTICAL BAR!!!! by the empty string.

I just found this out the hard way.

What is the difference between concurrency and parallelism?

Concurrency simple means more than one tasks are running (not necessary in parallel). For example assumer we have 3 tasks then at any moment of time: more than one may be running or all may be running at same time.

Parallelism mean they are literally running in parallel. So in that case all three must be running at same time.

WHERE vs HAVING

HAVING is used to filter on aggregations in your GROUP BY.

For example, to check for duplicate names:

SELECT Name FROM Usernames
GROUP BY Name
HAVING COUNT(*) > 1

Select All as default value for Multivalue parameter

The accepted answer is correct, but not complete. In order for Select All to be the default option, the Available Values dataset must contain at least 2 columns: value and label. They can return the same data, but their names have to be different. The Default Values dataset will then use value column and then Select All will be the default value. If the dataset returns only 1 column, only the last record's value will be selected in the drop down of the parameter.

what innerHTML is doing in javascript?

The innerHTML property is used to get or set the HTML content of an element node.

Example: http://jsfiddle.net/mQMVc/

     // get the element with the "someElement" id, and give it new content
document.getElementById('someElement').innerHTML = "<p>new content</p>";

     // retrieve the content from an element
var content = document.getElementById('someElement').innerHTML;

alert( content );

Convert xlsx to csv in Linux with command line

Using the Gnumeric spreadsheet application which comes which a commandline utility called ssconvert is indeed super simple:

find . -name '*.xlsx' -exec ssconvert -T Gnumeric_stf:stf_csv {} \;

and you're done!

Not an enclosing class error Android Studio

startActivity(new Intent(this, Katra_home.class));

try this one it will be work

Run parallel multiple commands at once in the same terminal

To run multiple commands just add && between two commands like this: command1 && command2

And if you want to run them in two different terminals then you do it like this:

gnome-terminal -e "command1" && gnome-terminal -e "command2"

This will open 2 terminals with command1 and command2 executing in them.

Hope this helps you.

Cocoa Touch: How To Change UIView's Border Color And Thickness?

[self.view.layer setBorderColor: [UIColor colorWithRed:0.265 green:0.447 blue:0.767 alpha:1.0f].CGColor];

How to close a Tkinter window by pressing a Button?

You can use lambda to pass a reference to the window object as argument to close_window function:

button = Button (frame, text="Good-bye.", command = lambda: close_window(window))

This works because the command attribute is expecting a callable, or callable like object. A lambda is a callable, but in this case it is essentially the result of calling a given function with set parameters.

In essence, you're calling the lambda wrapper of the function which has no args, not the function itself.

C# DateTime.ParseExact

That's because you have the Date in American format in line[i] and UK format in the FormatString.

11/20/2011
M / d/yyyy

I'm guessing you might need to change the FormatString to:

"M/d/yyyy h:mm"

Why can't a text column have a default value in MySQL?

You can get the same effect as a default value by using a trigger

create table my_text

(
   abc text
);

delimiter //
create trigger mytext_trigger before insert on my_text
for each row
begin
   if (NEW.abc is null ) then
      set NEW.abc = 'default text';
   end if;
end
//
delimiter ;

How to upload a file and JSON data in Postman?

If you want the Id and File in one object you can add your request object to a method as standard and then within Postman set the Body to form-data and prefix your keys with your request object name. e.g. request.SessionId and request.File.

Simple way to count character occurrences in a string

Something a bit more functional, without Regex:

public static int count(String s, char c) {
    return s.length()==0 ? 0 : (s.charAt(0)==c ? 1 : 0) + count(s.substring(1),c);
}

It's no tail recursive, for the sake of clarity.

Difference between null and empty string

Null means nothing. Its just a literal. Null is the value of reference variable. But empty string is blank.It gives the length=0. Empty string is a blank value,means the string does not have any thing.

PHP: convert spaces in string into %20?

Use the rawurlencode function instead.

Input length must be multiple of 16 when decrypting with padded cipher

Had a similar issue. But it is important to understand the root cause and it may vary for different use cases.

Scenario 1
You are trying to decrypt a value which was not encoded correctly in the first place.

byte[] encryptedBytes = Base64.decodeBase64(encryptedBase64String);

If the String is misconfigured for certain reason or has not been encoded correctly, you would see the error " Input length must be multiple of 16 when decrypting with padded cipher"

Scenario 2
Now if by any chance you are using this encoded string in url (trying to pass in the base64Encoded value in url, it will fail. You should do URLEncoding and then pass in the token, it will work.

Scenario 3
When integrating with one of the vendors, we found that we had to do encryption of Base64 using URLEncoder but then we need not decode it because it was done internally by the Vendor

how to open popup window using jsp or jquery?

You can use window.open for this

window.open("page url",null,
"height=200,width=400,status=yes,toolbar=no,menubar=no,location=no");

have a look at this link.. window.open

Best way to check if a character array is empty

The second one is fastest. Using strlen will be close if the string is indeed empty, but strlen will always iterate through every character of the string, so if it is not empty, it will do much more work than you need it to.

As James mentioned, the third option wipes the string out before checking, so the check will always succeed but it will be meaningless.

How to convert XML to java.util.Map and vice versa

I used the approach with the custom converter:

public static class MapEntryConverter implements Converter {

    public boolean canConvert(Class clazz) {
        return AbstractMap.class.isAssignableFrom(clazz);
    }

    public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {

        AbstractMap map = (AbstractMap) value;
        for (Object obj : map.entrySet()) {
            Entry entry = (Entry) obj;
            writer.startNode(entry.getKey().toString());
            context.convertAnother(entry.getValue());
            writer.endNode();
        }
    }

    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        // dunno, read manual and do it yourself ;)
    }

}

But i changed the the serialization of the maps value to delegate to the MarshallingContext. This should improve the solution to work for composite map values and nested maps as well.

Git: Could not resolve host github.com error while cloning remote repository in git

Restarting terminal in Mac worked.

Open source PDF library for C/C++ application?

LibHaru seems to be used by many.

A non-open source approach is: PDF Creator Pilot which provides more language options including C++, C#, Delphi, ASP, ASP.NET, VB, VB.NET, VBScript, PHP and Python

Making text background transparent but not text itself

opacity will make both text and background transparent. Use a semi-transparent background-color instead, by using a rgba() value for example. Works on IE8+

How to get relative path from absolute path

There is a Win32 (C++) function in shlwapi.dll that does exactly what you want: PathRelativePathTo()

I'm not aware of any way to access this from .NET other than to P/Invoke it, though.

Make JQuery UI Dialog automatically grow or shrink to fit its contents

var w = $('#dialogText').text().length;

$("#dialog").dialog('option', 'width', (w * 10));

did what i needed it to do for resizing the width of the dialog.

Using sessions & session variables in a PHP Login Script

$session_start();

extract($_POST);         
//extract data from submit post 

if(isset($submit))  
{

if($user=="user" && $pass=="pass")

{

$_SESSION['user']= $user;   

//if correct password and name store in session 

}
else {

echo "Invalid user and password";

header("Locatin:form.php");

}

if(isset($_SESSION['user'])) 

{

//your home page code here

exit;
}

Android Studio: Gradle - build fails -- Execution failed for task ':dexDebug'

In my case, I did Build > Clean Project and it worked!

Show/hide image with JavaScript

This is working code:

<html>
  <body bgcolor=cyan>
    <img src ="backgr1.JPG" id="my" width="310" height="392" style="position: absolute; top:92px; left:375px; visibility:hidden"/>
    <script type="text/javascript">
      function tend() {
        document.getElementById('my').style.visibility='visible';
      }
      function tn() {
        document.getElementById('my').style.visibility='hidden';
      }
    </script>
    <input type="button" onclick="tend()" value="back">
    <input type="button" onclick="tn()" value="close">
  </body>
</html>

Proper way to initialize C++ structs

I write some test code:

#include <string>
#include <iostream>
#include <stdio.h>

using namespace std;

struct sc {
    int x;
    string y;
    int* z;
};

int main(int argc, char** argv)
{
   int* r = new int[128];
   for(int i = 0; i < 128; i++ ) {
        r[i] = i+32;
   }
   cout << r[100] << endl;
   delete r;

   sc* a = new sc;
   sc* aa = new sc[2];
   sc* b = new sc();
   sc* ba = new sc[2]();

   cout << "az:" << a->z << endl;
   cout << "bz:" << b->z << endl;
   cout << "a:" << a->x << " y" << a->y << "end" << endl;
   cout << "b:" << b->x << " y" << b->y <<  "end" <<endl;
   cout << "aa:" << aa->x << " y" << aa->y <<  "end" <<endl;
   cout << "ba:" << ba->x << " y" << ba->y <<  "end" <<endl;
}

g++ compile and run:

./a.out 
132
az:0x2b0000002a
bz:0
a:854191480 yend
b:0 yend
aa:854190968 yend
ba:0 yend

How do I use the JAVA_OPTS environment variable?

Just figured it out in Oracle Java the environmental variable is called: JAVA_TOOL_OPTIONS rather than JAVA_OPTS

How to call same method for a list of objects?

The approach

for item in all:
    item.start()

is simple, easy, readable, and concise. This is the main approach Python provides for this operation. You can certainly encapsulate it in a function if that helps something. Defining a special function for this for general use is likely to be less clear than just writing out the for loop.

Displaying Windows command prompt output and redirecting it to a file

How do I display and redirect output to a file. Suppose if I use dos command, dir > test.txt ,this command will redirect output to file test.txt without displaying the results. how to write a command to display the output and redirect output to a file using DOS i.e., windows command prompt, not in UNIX/LINUX.

You may find these commands in biterscripting ( http://www.biterscripting.com ) useful.

var str output
lf > $output
echo $output                            # Will show output on screen.
echo $output > "test.txt"               # Will write output to file test.txt.
system start "test.txt"                 # Will open file test.txt for viewing/editing.

Add Marker function with Google Maps API

function initialize() {
    var location = new google.maps.LatLng(44.5403, -78.5463);
    var mapCanvas = document.getElementById('map_canvas');
    var map_options = {
      center: location,
      zoom: 15,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    }
    var map = new google.maps.Map(map_canvas, map_options);

    new google.maps.Marker({
        position: location,
        map: map
    });
}
google.maps.event.addDomListener(window, 'load', initialize);

'tsc command not found' in compiling typescript

I solved this on my machine by just running sudo npm install in the directory that I was getting the error.

Change language for bootstrap DateTimePicker

i think you have to set it in the options:

$(".form_datetime").datetimepicker({
    isRTL: false,
    format: 'dd.mm.yyyy hh:ii',
    autoclose:true,
    language: 'ru'
});

if its not working, be sure that:

$.fn.datetimepicker.dates['en'] = {
    days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"],
    daysShort: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
    daysMin: ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
    months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
    monthsShort: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
    today: "Today"
};

is defined for 'ru'

Floating point exception

It's caused by n % x where x = 0 in the first loop iteration. You can't calculate a modulus with respect to 0.

Excel VBA Code: Compile Error in x64 Version ('PtrSafe' attribute required)

I think all you need to do for your function is just add PtrSafe: i.e. the first line of your first function should look like this:

Private Declare PtrSafe Function swe_azalt Lib "swedll32.dll" ......

How to show "if" condition on a sequence diagram?

In Visual Studio UML sequence this can also be described as fragments which is nicely documented here: https://msdn.microsoft.com/en-us/library/dd465153.aspx

How to know Laravel version and where is it defined?

In your Laravel deployment it would be

/vendor/laravel/framework/src/Illuminate/Foundation/Application.php

to see who changed your Laravel version look at what's defined in composer.json. If you have "laravel/framework": "5.4.*", then it will update to the latest after composer update is run. Composer.lock is the file that results from running a composer update, so really see who last one to modify the composer.json file was (hopefully you have that in version control). You can read more about it here https://getcomposer.org/doc/01-basic-usage.md

Fragment onCreateView and onActivityCreated called twice

I was scratching my head about this for a while too, and since Dave's explanation is a little hard to understand I'll post my (apparently working) code:

private class TabListener<T extends Fragment> implements ActionBar.TabListener {
    private Fragment mFragment;
    private Activity mActivity;
    private final String mTag;
    private final Class<T> mClass;

    public TabListener(Activity activity, String tag, Class<T> clz) {
        mActivity = activity;
        mTag = tag;
        mClass = clz;
        mFragment=mActivity.getFragmentManager().findFragmentByTag(mTag);
    }

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if (mFragment == null) {
            mFragment = Fragment.instantiate(mActivity, mClass.getName());
            ft.replace(android.R.id.content, mFragment, mTag);
        } else {
            if (mFragment.isDetached()) {
                ft.attach(mFragment);
            }
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        if (mFragment != null) {
            ft.detach(mFragment);
        }
    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
    }
}

As you can see it's pretty much like the Android sample, apart from not detaching in the constructor, and using replace instead of add.

After much headscratching and trial-and-error I found that finding the fragment in the constructor seems to make the double onCreateView problem magically go away (I assume it just ends up being null for onTabSelected when called through the ActionBar.setSelectedNavigationItem() path when saving/restoring state).

How to change Named Range Scope

These answers were helpful in solving a similar issue while trying to define a named range with Workbook scope. The "ah-HA!" for me is to use the Names Collection which is relative to the whole Workbook! This may be restating the obvious to many, but it wasn't clearly stated in my research, so I share for other's with similar questions.

' Local / Worksheet only scope
Worksheets("Sheet2").Names.Add Name:="a_test_rng1", RefersTo:=Range("A1:A4")

' Global / Workbook scope
ThisWorkbook.Names.Add Name:="a_test_rng2", RefersTo:=Range("B1:b4")

If you look at your list of names when Sheet2 is active, both ranges are there, but switch to any other sheet, and "a_test_rng1" is not present.

Now I can happily generate a named range in my code with what ever scope I deem appropriate. No need mess around with the name manager or a plug in.

Aside, the name manager in Excel Mac 2011 is a mess, but I did discover that while there are no column labels to tell you what you're looking at while viewing your list of named ranges, if there is a sheet listed beside the name, that name is scoped to worksheet / local. See screenshot attached.

Full credit to this article for putting together the pieces.

Difference between null and empty ("") Java String

You may also understand the difference between null and an empty string this way:

Original image by R. Sato (@raysato)

Reading/writing an INI file

I want to introduce an IniParser library I've created completely in c#, so it contains no dependencies in any OS, which makes it Mono compatible. Open Source with MIT license -so it can be used in any code.

You can check out the source in GitHub, and it is also available as a NuGet package

It's heavily configurable, and really simple to use.

Sorry for the shameless plug but I hope it can be of help of anyone revisiting this answer.

How can I tell where mongoDB is storing data? (its not in the default /data/db!)

Found it just by poking around in /var/db. Thanks for the help though--I am sure these answers apply to other systems (e.g. Ubuntu) and will help others!

How to determine if Javascript array contains an object with an attribute that equals a given value?

Unless you want to restructure it like this:

vendors = {
    Magenic: {
      Name: 'Magenic',
      ID: 'ABC'
     },
    Microsoft: {
      Name: 'Microsoft',
      ID: 'DEF'
    } and so on... 
};

to which you can do if(vendors.Magnetic)

You will have to loop

What is the difference between Cygwin and MinGW?

Don't overlook AT&T's U/Win software, which is designed to help you compile Unix applications on windows (last version - 2012-08-06; uses Eclipse Public License, Version 1.0).

Like Cygwin they have to run against a library; in their case POSIX.DLL. The AT&T guys are terrific engineers (same group that brought you ksh and dot) and their stuff is worth checking out.

pyplot scatter plot marker size

It is the area of the marker. I mean if you have s1 = 1000 and then s2 = 4000, the relation between the radius of each circle is: r_s2 = 2 * r_s1. See the following plot:

plt.scatter(2, 1, s=4000, c='r')
plt.scatter(2, 1, s=1000 ,c='b')
plt.scatter(2, 1, s=10, c='g')

enter image description here

I had the same doubt when I saw the post, so I did this example then I used a ruler on the screen to measure the radii.

How to import Angular Material in project?

You should consider using a SharedModule for the essential material components of your app, and then import every single module you need to use into your feature modules. I wrote an article on medium explaining how to import Angular material, check it out:

https://medium.com/@benmohamehdi/how-to-import-angular-material-angular-best-practices-80d3023118de

How can I send an Ajax Request on button click from a form with 2 buttons?

Given that the only logical difference between the handlers is the value of the button clicked, you can use the this keyword to refer to the element which raised the event and get the val() from that. Try this:

$("button").click(function(e) {
    e.preventDefault();
    $.ajax({
        type: "POST",
        url: "/pages/test/",
        data: { 
            id: $(this).val(), // < note use of 'this' here
            access_token: $("#access_token").val() 
        },
        success: function(result) {
            alert('ok');
        },
        error: function(result) {
            alert('error');
        }
    });
});

Java - Using Accessor and Mutator methods

You need to remove the static from your accessor methods - these methods need to be instance methods and access the instance variables

public class IDCard {
    public String name, fileName;
    public int id;

    public IDCard(final String name, final String fileName, final int id) {
        this.name = name;
        this.fileName = fileName
        this.id = id;
    }

    public String getName() {
        return name;
    }
}

You can the create an IDCard and use the accessor like this:

final IDCard card = new IDCard();
card.getName();

Each time you call new a new instance of the IDCard will be created and it will have it's own copies of the 3 variables.

If you use the static keyword then those variables are common across every instance of IDCard.

A couple of things to bear in mind:

don't add useless comments - they add code clutter and nothing else.
conform to naming conventions, use lower case of variable names - name not Name.

Reload browser window after POST without prompting user to resend POST data

This is an older post, but I do have a better solution. Create a form containing all of your post values as hidden fields and give the form a name such as:

<form name="RefreshForm" method="post" action="http://yoursite/yourscript">
    <input type="hidden" name="postVariable" value="PostData">
</form>

Then all you need to do in your setTimeout is RefreshForm.submit();

Cheers!

postgresql return 0 if returned value is null

(this answer was added to provide shorter and more generic examples to the question - without including all the case-specific details in the original question).

There are two distinct "problems" here, the first is if a table or subquery has no rows, the second is if there are NULL values in the query.

For all versions I've tested, postgres and mysql will ignore all NULL values when averaging, and it will return NULL if there is nothing to average over. This generally makes sense, as NULL is to be considered "unknown". If you want to override this you can use coalesce (as suggested by Luc M).

$ create table foo (bar int);
CREATE TABLE

$ select avg(bar) from foo;
 avg 
-----

(1 row)

$ select coalesce(avg(bar), 0) from foo;
 coalesce 
----------
        0
(1 row)

$ insert into foo values (3);
INSERT 0 1
$ insert into foo values (9);
INSERT 0 1
$ insert into foo values (NULL);
INSERT 0 1
$ select coalesce(avg(bar), 0) from foo;
      coalesce      
--------------------
 6.0000000000000000
(1 row)

of course, "from foo" can be replaced by "from (... any complicated logic here ...) as foo"

Now, should the NULL row in the table be counted as 0? Then coalesce has to be used inside the avg call.

$ select coalesce(avg(coalesce(bar, 0)), 0) from foo;
      coalesce      
--------------------
 4.0000000000000000
(1 row)

How to import multiple csv files in a single load?

Note that you can use other tricks like :

-- One or more wildcard:
       .../Downloads20*/*.csv
--  braces and brackets   
       .../Downloads201[1-5]/book.csv
       .../Downloads201{11,15,19,99}/book.csv

How to change the playing speed of videos in HTML5?

You can use this code:

var vid = document.getElementById("video1");

function slowPlaySpeed() { 
    vid.playbackRate = 0.5;
} 

function normalPlaySpeed() { 
    vid.playbackRate = 1;
} 

function fastPlaySpeed() { 
    vid.playbackRate = 2;
}

Ignoring NaNs with str.contains

You can also patern :

DF[DF.col.str.contains(pat = '(foo)', regex = True) ]

What is the difference between Integer and int in Java?

int is a primitive type. Variables of type int store the actual binary value for the integer you want to represent. int.parseInt("1") doesn't make sense because int is not a class and therefore doesn't have any methods.

Integer is a class, no different from any other in the Java language. Variables of type Integer store references to Integer objects, just as with any other reference (object) type. Integer.parseInt("1") is a call to the static method parseInt from class Integer (note that this method actually returns an int and not an Integer).

To be more specific, Integer is a class with a single field of type int. This class is used where you need an int to be treated like any other object, such as in generic types or situations where you need nullability.

Note that every primitive type in Java has an equivalent wrapper class:

byte has Byte
short has Short
int has Integer
long has Long
boolean has Boolean
char has Character
float has Float
double has Double

Wrapper classes inherit from Object class, and primitive don't. So it can be used in collections with Object reference or with Generics.

Since java 5 we have autoboxing, and the conversion between primitive and wrapper class is done automatically. Beware, however, as this can introduce subtle bugs and performance problems; being explicit about conversions never hurts.

Force "portrait" orientation mode

Short answer: Don't do it.

Redesign your app so that it can run in both portrait and landscape mode. There is no such thing as a UI that can't be designed to work in both portrait and landscape; only lazy or unimaginative developers.

The reason why is rather simple. You want your app to be usable by as wide an audience as possible on as many different devices as possible. By forcing a particular screen orientation, you prevent your app from running (usably) on devices that don't support that orientation and you frustrate and alienate potential customers who prefer a different orientation.

Example: You design your app to force portrait mode. A customer downloads the app on a 2-in-1 device which they use predominantly in landscape mode.
Consequence 1: Your app is unusable, or your customer is forced to undock their device, rotate it, and use it in an orientation that is not familiar or comfortable for them.
Consequence 2: The customer gets frustrated by your app's non-intuitive design and finds an alternative or ditches the app entirely.

I'm fighting with this with an app right now and as a consumer and a developer, I hate it. As useful as the app is, as fantastic as the features are that it offers, I absolutely hate the app because it forces me to use an orientation that is counter to every other way that I use my device.

You don't want your customers to hate your app.

I know this doesn't directly answer the question, so I want to explain it in a little more detail for those who are curious.

There is a tendency for developers to be really good at writing code and really terrible at design. This question, though it sounds like a code question and the asker certainly feels like it's a code question, is really a design question.

The question really is "Should I lock the screen orientation in my app?" The asker chose to design the UI to function and look good only in portrait mode. I suspect it was to save development time or because the app's workflow is particularly conducive to a portrait layout (common for mobile games). But those reasons neglect all the real important factors that motivate proper design.

Customer engagement - you want your customers to feel pulled into your app, not pushed out of it. The app should transition smoothly from whatever your customer was doing prior to opening your app. (This is the reason most platforms have consistent design principles, so most apps look more or less alike though they don't have to.)
Customer response - you want your customers to react positively to your app. They should enjoy using it. Even if it's a payroll app for work, it should be a pleasure for them to open it and clock in. The app should save your customers time and reduce frustration over alternatives. (Apps that annoy users build resentment against your app which grows into resentment against your brand.)
Customer conversion - you want your customers to be able to quickly and easily move from browsing to interacting. This is the ultimate goal of any app, to convert impressions into revenue. (Apps that don't generate revenue are a waste of your time to build, from a business perspective.)

A poorly designed UI reduces customer engagement and response which ultimately results in lower revenue. In a mobile-centric world (and particularly on the subject of portrait/landscape display modes), this explains why responsive web design is such a big deal. Walmart Canada introduced responsive design on their website in November 2013 and saw a 20% increase in customer conversion. O'Neill Clothing implemented responsive web design and revenue from customers using iOS devices increased 101.25%, and 591.42% from customers using Android devices.

There is also a tendency for developers to focus intently on implementing a particular solution (such as locking display orientation), and most of the developers on this site will be all too glad to help implement that solution, without questioning whether that is even the best solution to the problem.

Locking your screen orientation is the UI design equivalent of implementing a do-while loop. Are you really sure you want to do it that way, or is there a better alternative?

Don't force your app into a single display mode. Invest the extra time and effort to make it responsive.

Can I clear cell contents without changing styling?

you can use ClearContents. ex,

Range("X").Cells.ClearContents

Scroll to element on click in Angular 4

Jon has the right answer and this works in my angular 5 and 6 projects.

If I wanted to click to smoothly scroll from navbar to footer:

<button (click)="scrollTo('.footer')">ScrolltoFooter</button>
<footer class="footer">some code</footer>

scrollTo(className: string):void {
   const elementList = document.querySelectorAll('.' + className);
   const element = elementList[0] as HTMLElement;
   element.scrollIntoView({ behavior: 'smooth' });
}

Because I wanted to scroll back to the header from the footer, I created a service that this function is located in and injected it into the navbar and footer components and passed in 'header' or 'footer' where needed. just remember to actually give the component declarations the class names used:

<app-footer class="footer"></app-footer>

JavaScript: Create and save file

_x000D_

function download(text, name, type) {_x000D_
  var a = document.getElementById("a");_x000D_
  var file = new Blob([text], {type: type});_x000D_
  a.href = URL.createObjectURL(file);_x000D_
  a.download = name;_x000D_
}

_x000D_

<a href="" id="a">click here to download your file</a>_x000D_
<button onclick="download('file text', 'myfilename.json', 'text/json')">Create file</button>

_x000D_

I think this can work with json files too if you change the mime type.

How to trap the backspace key using jQuery?

try this one :

 $('html').keyup(function(e){if(e.keyCode == 8)alert('backspace trapped')})

CSS transition when class removed

The @jfriend00's answer helps me to understand the technique to animate only remove class (not add).

A "base" class should have transition property (like transition: 2s linear all;). This enables animations when any other class is added or removed on this element. But to disable animation when other class is added (and only animate class removing) we need to add transition: none; to the second class.

Example

CSS:

.issue {
  background-color: lightblue;
  transition: 2s linear all;
}

.recently-updated {
  background-color: yellow;
  transition: none;
}

HTML:

<div class="issue" onclick="addClass()">click me</div>

JS (only needed to add class):

var timeout = null;

function addClass() {
  $('.issue').addClass('recently-updated');
  if (timeout) {
    clearTimeout(timeout);
    timeout = null;
  }
  timeout = setTimeout(function () {
    $('.issue').removeClass('recently-updated');
  }, 1000);
}

plunker of this example.

With this code only removing of recently-updated class will be animated.

What is the basic difference between the Factory and Abstract Factory Design Patterns?

Both Factory Method and Abstract Factory keep the clients decoupled from the concrete types. Both create objects, but Factory method uses inheritance whereas Abstract Factory use composition.

The Factory Method is inherited in subclasses to create the concrete objects(products) whereas Abstract Factory provide interface for creating the family of related products and subclass of these interface define how to create related products.

Then these subclasses when instantiated is passed into product classes where it is used as abstract type. The related products in an Abstract Factory are often implemented using Factory Method.

How does strcmp() work?

This, from the masters themselves (K&R, 2nd ed., pg. 106):

// strcmp: return < 0 if s < t, 0 if s == t, > 0 if s > t
int strcmp(char *s, char *t) 
{
    int i;

    for (i = 0; s[i] == t[i]; i++)
        if (s[i] == '\0')
            return 0;
    return s[i] - t[i];
}

How do I get the max and min values from a set of numbers entered?

System.out.print("Enter a Value: ");
val = s.nextInt();

This line is placed in last.The whole code is as follows:-

public static void main(String[] args){
    int min, max;

    Scanner s = new Scanner(System.in);
    System.out.print("Enter a Value: ");
    int val = s.nextInt();
    min = max = val;

    while (val != 0) {
        if (val < min) {
            min = val;
        }
        if (val > max) {
            max = val;
        }
        System.out.print("Enter a Value: ");
        val = s.nextInt();

    }
    System.out.println("Min: " + min);
    System.out.println("Max: " + max);
}

Android: How do I get string from resources using its name?

Best Approach

App.getRes().getString(R.string.some_id)

Will work Everywhere (Utils, Models also).

I have read all the answers, all answers can make your work done.

You can use getString(R.string.some_string_id) in both Activity or Fragment.
You can use Context.getString(R.string.some_string_id) where you don't have direct access to getString() method. Like Dialog.

Problem

When you don't have Context access, like a method in your Util class.

Assume below method without Context.

public void someMethod(){
    ...
    // can't use getResource() or getString() without Context.
}

Now you will pass Context as a parameter in this method and use getString().

public void someMethod(Context context){
    ...
    context.getString(R.string.some_id);
}

What i do is

public void someMethod(){
    ...
    App.getAppResources().getString(R.string.some_id)
}

What? It is very simple to use anywhere in your app!

So here is a solution by which you can access resources from anywhere like Util class .

import android.app.Application;
import android.content.res.Resources;

public class App extends Application {
    private static Resources resources;

    @Override
    public void onCreate() {
        super.onCreate();

        resources = getResources();
    }

    public static Resources getAppResources() {
        return resources;
    }

}

Add name field to your manifest.xml <application tag.

<application
        android:name=".App"
        ...
        >
        ...
    </application>

Now you are good to go. Use App.getAppResources().getString(R.string.some_id) anywhere in app.

SQL: Alias Column Name for Use in CASE Statement

SELECT
    a AS [blabla a],
    b [blabla b],
    CASE c
        WHEN 1 THEN 'aaa'
        WHEN 2 THEN 'bbb'
        ELSE 'unknown' 
    END AS [my alias], 
    d AS [blabla d]
FROM mytable

How to get AM/PM from a datetime in PHP

for flexibility with different formats, use:

$dt = DateTime::createFromFormat('m/d/Y H:i:s', '08/04/2010 22:15:00');
echo $dt->format('g:i A')

Check the php manual for additional format options.

PHP Function with Optional Parameters

PHP allows default arguments (link). In your case, you could define all the parameters from 3 to 8 as NULL or as an empty string "" depending on your function code. In this way, you can call the function only using the first two parameters.

For example:

<?php
  function yourFunction($arg1, $arg2, $arg3=NULL, $arg4=NULL, $arg5=NULL, $arg6=NULL, $arg7=NULL, $arg8=NULL){
echo $arg1;
echo $arg2;
if(isset($arg3)){echo $arg3;}
# other similar statements for $arg4, ...., $arg5
if(isset($arg8)){echo $arg8;}
}

How to use the CancellationToken property?

You can use ThrowIfCancellationRequested without handling the exception!

The use of ThrowIfCancellationRequested is meant to be used from within a Task (not a Thread). When used within a Task, you do not have to handle the exception yourself (and get the Unhandled Exception error). It will result in leaving the Task, and the Task.IsCancelled property will be True. No exception handling needed.

In your specific case, change the Thread to a Task.

Task t = null;
try
{
    t = Task.Run(() => Work(cancelSource.Token), cancelSource.Token);
}

if (t.IsCancelled)
{
    Console.WriteLine("Canceled!");
}

Inserting an item in a Tuple

one way is to convert it to list

>>> b=list(mytuple)
>>> b.append("something")
>>> a=tuple(b)

How to automatically close cmd window after batch file execution?

Modify the batch file to START both programs, instead of STARTing one and CALLing another

start C:\Users\Yiwei\Downloads\putty.exe -load "MathCS-labMachine1"
start "" "C:\Program Files (x86)\Xming\Xming.exe" :0 -clipboard -multiwindow

If you run it like this, no CMD window will stay open after starting the program.

Unzip a file with php

Simply try this yourDestinationDir is the destination to extract to or remove -d yourDestinationDir to extract to root dir.

$master = 'someDir/zipFileName';
$data = system('unzip -d yourDestinationDir '.$master.'.zip');

Including dependencies in a jar with Maven

You can do this using the maven-assembly plugin with the "jar-with-dependencies" descriptor. Here's the relevant chunk from one of our pom.xml's that does this:

  <build>
    <plugins>
      <!-- any other plugins -->
      <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
      </plugin>
    </plugins>
  </build>

MySQL Workbench Edit Table Data is read only

This is the Known limitation in MySQLWorkbench (you can't edit table w/o PK):

To Edit the Table:

Method 1: (method not working in somecases)
right-click on a table within the Object Browser and choose the Edit Table Data option from there.

Method 2:
I would rather suggest you to add Primary Key Instead:

ALTER TABLE `your_table_name` ADD PRIMARY KEY (`column_name`);

and you might want to remove the existing rows first:

Truncate table your_table_name

Eclipse can't find / load main class

I had this issue after upgrading to the Eclipse 2019-12 release. Somehow the command line to launch the JVM got too long and I had to enable the jar-classpath option in the run configuration (right click on file -> run as -> run configs).

Cleanest Way to Invoke Cross-Thread Events

A couple of observations:

Don't create simple delegates explicitly in code like that unless you're pre-2.0 so you could use:

   BeginInvoke(new EventHandler<CoolObjectEventArgs>(mCoolObject_CoolEvent), 
               sender, 
               args);

Also you don't need to create and populate the object array because the args parameter is a "params" type so you can just pass in the list.
I would probably favor Invoke over BeginInvoke as the latter will result in the code being called asynchronously which may or may not be what you're after but would make handling subsequent exceptions difficult to propagate without a call to EndInvoke. What would happen is that your app will end up getting a TargetInvocationException instead.

Is it possible to have multiple statements in a python lambda expression?

Time traveler here. If you generally want to have multiple statements within a lambda, you can pass other lambdas as arguments to that lambda.

(lambda x, f: list((y[1] for y in f(x))))(lst, lambda x: (sorted(y) for y in x))

You can't actually have multiple statements, but you can simulate that by passing lambdas to lambdas.

Edit: The time traveler returns! You can also abuse the behavior of boolean expressions (keeping in mind short-circuiting rules and truthiness) to chain operations. Using the ternary operator gives you even more power. Again, you can't have multiple statements, but you can of course have many function calls. This example does some arbitrary junk with a bunch of data, but, it shows that you can do some funny stuff. The print statements are examples of functions which return None (as does the .sort() method) but they also help show what the lambda is doing.

>>> (lambda x: print(x) or x+1)(10)
10
11
>>> f = (lambda x: x[::2] if print(x) or x.sort() else print(enumerate(x[::-1]) if print(x) else filter(lambda (i, y): print((i, y)) or (i % 3 and y % 2), enumerate(x[::-1]))))
>>> from random import shuffle
>>> l = list(range(100))
>>> shuffle(l)
>>> f(l)
[84, 58, 7, 99, 17, 14, 60, 35, 12, 56, 26, 48, 55, 40, 28, 52, 31, 39, 43, 96, 64, 63, 54, 37, 79, 25, 46, 72, 10, 59, 24, 68, 23, 13, 34, 41, 94, 29, 62, 2, 50, 32, 11, 97, 98, 3, 70, 93, 1, 36, 87, 47, 20, 73, 45, 0, 65, 57, 6, 76, 16, 85, 95, 61, 4, 77, 21, 81, 82, 30, 53, 51, 42, 67, 74, 8, 15, 83, 5, 9, 78, 66, 44, 27, 19, 91, 90, 18, 49, 86, 22, 75, 71, 88, 92, 33, 89, 69, 80, 38]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
(0, 99)
(1, 98)
(2, 97)
(3, 96)
(4, 95)
(5, 94)
(6, 93)
(7, 92)
(8, 91)
(9, 90)
(10, 89)
(11, 88)
(12, 87)
(13, 86)
(14, 85)
(15, 84)
(16, 83)
(17, 82)
(18, 81)
(19, 80)
(20, 79)
(21, 78)
(22, 77)
(23, 76)
(24, 75)
(25, 74)
(26, 73)
(27, 72)
(28, 71)
(29, 70)
(30, 69)
(31, 68)
(32, 67)
(33, 66)
(34, 65)
(35, 64)
(36, 63)
(37, 62)
(38, 61)
(39, 60)
(40, 59)
(41, 58)
(42, 57)
(43, 56)
(44, 55)
(45, 54)
(46, 53)
(47, 52)
(48, 51)
(49, 50)
(50, 49)
(51, 48)
(52, 47)
(53, 46)
(54, 45)
(55, 44)
(56, 43)
(57, 42)
(58, 41)
(59, 40)
(60, 39)
(61, 38)
(62, 37)
(63, 36)
(64, 35)
(65, 34)
(66, 33)
(67, 32)
(68, 31)
(69, 30)
(70, 29)
(71, 28)
(72, 27)
(73, 26)
(74, 25)
(75, 24)
(76, 23)
(77, 22)
(78, 21)
(79, 20)
(80, 19)
(81, 18)
(82, 17)
(83, 16)
(84, 15)
(85, 14)
(86, 13)
(87, 12)
(88, 11)
(89, 10)
(90, 9)
(91, 8)
(92, 7)
(93, 6)
(94, 5)
(95, 4)
(96, 3)
(97, 2)
(98, 1)
(99, 0)
[(2, 97), (4, 95), (8, 91), (10, 89), (14, 85), (16, 83), (20, 79), (22, 77), (26, 73), (28, 71), (32, 67), (34, 65), (38, 61), (40, 59), (44, 55), (46, 53), (50, 49), (52, 47), (56, 43), (58, 41), (62, 37), (64, 35), (68, 31), (70, 29), (74, 25), (76, 23), (80, 19), (82, 17), (86, 13), (88, 11), (92, 7), (94, 5), (98, 1)]

Java: splitting a comma-separated string but ignoring commas in quotes

Try:

public class Main { 
    public static void main(String[] args) {
        String line = "foo,bar,c;qual=\"baz,blurb\",d;junk=\"quux,syzygy\"";
        String[] tokens = line.split(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)", -1);
        for(String t : tokens) {
            System.out.println("> "+t);
        }
    }
}

Output:

> foo
> bar
> c;qual="baz,blurb"
> d;junk="quux,syzygy"

In other words: split on the comma only if that comma has zero, or an even number of quotes ahead of it.

Or, a bit friendlier for the eyes:

public class Main { 
    public static void main(String[] args) {
        String line = "foo,bar,c;qual=\"baz,blurb\",d;junk=\"quux,syzygy\"";

        String otherThanQuote = " [^\"] ";
        String quotedString = String.format(" \" %s* \" ", otherThanQuote);
        String regex = String.format("(?x) "+ // enable comments, ignore white spaces
                ",                         "+ // match a comma
                "(?=                       "+ // start positive look ahead
                "  (?:                     "+ //   start non-capturing group 1
                "    %s*                   "+ //     match 'otherThanQuote' zero or more times
                "    %s                    "+ //     match 'quotedString'
                "  )*                      "+ //   end group 1 and repeat it zero or more times
                "  %s*                     "+ //   match 'otherThanQuote'
                "  $                       "+ // match the end of the string
                ")                         ", // stop positive look ahead
                otherThanQuote, quotedString, otherThanQuote);

        String[] tokens = line.split(regex, -1);
        for(String t : tokens) {
            System.out.println("> "+t);
        }
    }
}

which produces the same as the first example.

EDIT

As mentioned by @MikeFHay in the comments:

I prefer using Guava's Splitter, as it has saner defaults (see discussion above about empty matches being trimmed by String#split(), so I did:
Splitter.on(Pattern.compile(",(?=(?:[^\"]*\"[^\"]*\")*[^\"]*$)"))

Node.js https pem error: routines:PEM_read_bio:no start line

For me, after trying all above solutions it ended up being a problem related to encoding. Concisely, my key was encoded using 'UTF-8 with BOM'. It should be UTF-8 instead.

To fix it, at least using VS Code follow this steps:

Open the file and click on the encoding button at the status bar (at the bottom) and select 'Save with encoding'.
Select UTF-8.
Then try using the certificate again.

I suppose you can use other editors that support saving with the proper encoding.

Source: error:0906d06c:pem routines:pem_read_bio:no start line, when importing godaddy SSL certificate

P.D I did not need to set the encoding to utf-8 option when loading the file using the fs.readFileSync function.

Hope this helps somebody!

How to install PyQt5 on Windows?

You can easily install it using Anaconda. At first install Anaconda or Miniconda on you system (download from here) and then install the pyqt as follow:

conda install pyqt

It works for both version of python (2 and 3).

How to run Conda?

If you installed Anaconda with Visual Studio 2017 for Windows, conda executable is in this path or similar.

In my case path is this: C:\Program Files (x86)\Microsoft Visual Studio\Shared\Anaconda3_64\Scripts

Steps to add it to your PATH:

On the Windows desktop, right-click My Computer.
In the pop-up menu, click Properties.
In the System Properties window, click the Advanced tab, and then click Environment Variables.
In the System Variables window, highlight Path, and click Edit.
Add your path and restart your cmd.

You will be able to execute conda

Happy coding!

What is the difference between an Instance and an Object?

Object:

It is a generice term basically it is a Software bundle that has state(variables) and behaviour(methods)

Class:

A blue print(template) for an object instance-it's a unique object thing for example you create a object two times what does that mean is yo have created two instances

Let me give an example

Class student()
{
   private string firstName;
  public student(string fname)
  {
    firstName=fname;
  }
  Public string GetFirstName()
  {
    return firstName;
  }
}

Object example:

Student s1=new student("Martin"); Student s2=new student("Kumar");

The s1,s2 are having object of class Student

Instance:

s1 and s2 are instances of object student the two are unique.

it can be called as reference also.

basically the s1 and s2 are variables that are assigned an object

find all the name using mysql query which start with the letter 'a'

I would go for substr() functionality in MySql.

Basically, this function takes account of three parameters i.e. substr(str,pos,len)

http://www.w3resource.com/mysql/string-functions/mysql-substr-function.php

SELECT * FROM artists 
WHERE lower(substr(name,1,1)) in ('a','b','c');

Print JSON parsed object?

If you want to debug why not use console debug

window.console.debug(jsonObject);

How to compare timestamp dates with date-only parameter in MySQL?

When I read your question, I thought your were on Oracle DB until I saw the tag 'MySQL'. Anyway, for people working with Oracle here is the way:

SELECT *
FROM table
where timestamp = to_timestamp('21.08.2017 09:31:57', 'dd-mm-yyyy hh24:mi:ss');

hidden field in php

Yes, you can access it through GET and POST (trying this simple task would have made you aware of that).

Yes, there are other ways, one of the other "preferred" ways is using sessions. When you would want to use hidden over session is kind of touchy, but any GET / POST data is easily manipulated by the end user. A session is a bit more secure given it is saved to a file on the server and it is much harder for the end user to manipulate without access through the program.

Print line numbers starting at zero using awk

If Perl is an option, you can try this:

perl -ne 'printf "%s,$_" , $.-1' file

$_ is the line
$. is the line number

Detect if PHP session exists

function is_session_started()
{
    if ( php_sapi_name() !== 'cli' ) {
        if ( version_compare(phpversion(), '5.4.0', '>=') ) {
            return session_status() === PHP_SESSION_ACTIVE ? TRUE : FALSE;
        } else {
            return session_id() === '' ? FALSE : TRUE;
        }
    }
    return FALSE;
}

// Example
if ( is_session_started() === FALSE ) session_start();

Can't execute jar- file: "no main manifest attribute"

If the jar isn't following the rules, it's not an executable jar.

How do I change the default location for Git Bash on Windows?

Make a Git Bash shortcut to Desktop for convenience then right click on the icon goto properties. Here you will find the Start in: section with a text box. Replace the path you want, for example like:

%USERPROFILE%\Desktop

Then open it directly by clicking on the icon. You will get the default Desktop path in Git Bash.

Android: Difference between Parcelable and Serializable?

1. Serializable

@see http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html

Interface of what?

is a standard Java interface

Speed

slower than Parcelable

2. Parcelable

@see http://developer.android.com/reference/android/os/Parcelable.html

Interface of what?

is android.os interface
- which means Google developped Parcelable for better performance on android

Speed

faster ( because it is optimized for usage on android development)

> In Conclusion

Be aware that Serializable is a standard Java interface, and Parcelable is for Android Development

Permanently add a directory to PYTHONPATH?

Instead of manipulating PYTHONPATH you can also create a path configuration file. First find out in which directory Python searches for this information:

python -m site --user-site

For some reason this doesn't seem to work in Python 2.7. There you can use:

python -c 'import site; site._script()' --user-site

Then create a .pth file in that directory containing the path you want to add (create the directory if it doesn't exist).

For example:

# find directory
SITEDIR=$(python -m site --user-site)

# create if it doesn't exist
mkdir -p "$SITEDIR"

# create new .pth file with our path
echo "$HOME/foo/bar" > "$SITEDIR/somelib.pth"

Windows command to get service status?

Well i see "Nick Kavadias" telling this:

"according to this http://www.computerhope.com/nethlp.htm it should be NET START /LIST ..."

If you type in Windows XP this:

NET START /LIST

you will get an error, just type instead

NET START

The /LIST is only for Windows 2000... If you fully read such web you would see the /LIST is only on Windows 2000 section.

Hope this helps!!!

How do I wait until Task is finished in C#?

A clean example that answers the Title

string output = "Error";
Task task = Task.Factory.StartNew(() =>
{
    System.Threading.Thread.Sleep(2000);
    output = "Complete";
});

task.Wait();
Console.WriteLine(output);

How would I stop a while loop after n amount of time?

Try the following:

import time
timeout = time.time() + 60*5   # 5 minutes from now
while True:
    test = 0
    if test == 5 or time.time() > timeout:
        break
    test = test - 1

You may also want to add a short sleep here so this loop is not hogging CPU (for example time.sleep(1) at the beginning or end of the loop body).

What dependency is missing for org.springframework.web.bind.annotation.RequestMapping?

I was using spring-web version 4.3.7

Changing it to a working 4.1.7 immediately solved it.

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>

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NewtonSoft.Json Serialize and Deserialize class with property of type IEnumerable<ISomeInterface>

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keypress, ctrl+c (or some combo like that)

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ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'