Programs & Examples On #Collabnet

CollabNet, Inc. is an American company that develops collaboration software and services for development teams.

Configuring so that pip install can work from github

you can try this way in Colab

!git clone
!pip install -e /content/sentence-transformers
import sentence_transformers

Setting the height of a DIV dynamically

What should happen in the case of overflow? If you want it to just get to the bottom of the window, use absolute positioning:

div {
  position: absolute;
  top: 300px;
  bottom: 0px;
  left: 30px;
  right: 30px;

This will put the DIV 30px in from each side, 300px from the top of the screen, and flush with the bottom. Add an overflow:auto; to handle cases where the content is larger than the div.

Edit: @Whoever marked this down, an explanation would be nice... Is something wrong with the answer?

How to get the focused element with jQuery?

$(':focus')[0] will give you the actual element.

$(':focus') will give you an array of elements, usually only one element is focused at a time so this is only better if you somehow have multiple elements focused.

EnterKey to press button in VBA Userform

Further to @Penn's comment, and in case the link breaks, you can also achieve this by setting the Default property of the button to True (you can set this in the properties window, open by hitting F4)

That way whenever Return is hit, VBA knows to activate the button's click event. Similarly setting the Cancel property of a button to True would cause that button's click event to run whenever ESC key is hit (useful for gracefully exiting the Userform)

Source: Olivier Jacot-Descombes's answer accessible here

Count number of occurrences by month

For anyone finding this post through Google (as I did) here's the correct formula for cell F5 in the above example:

=SUMPRODUCT((MONTH(Sheet1!$A$1:$A$50)=MONTH(DATEVALUE(E5&" 1")))*(Sheet1!$A$1:$A$50<>""))

Formula assumes a list of dates in Sheet1!A1:A50 and a month name or abbr ("April" or "Apr") in cell E5.

Disable all table constraints in Oracle

To take in count the dependencies between the constraints:

SET Serveroutput ON
    FOR c IN
    (SELECT c.owner,c.table_name,c.constraint_name
    FROM user_constraints c,user_tables t
    WHERE c.table_name=t.table_name
    AND c.status='ENABLED'
    ORDER BY c.constraint_type DESC,c.last_change DESC
        FOR D IN
        (SELECT P.Table_Name Parent_Table,C1.Table_Name Child_Table,C1.Owner,P.Constraint_Name Parent_Constraint,
            c1.constraint_name Child_Constraint
        FROM user_constraints p
        JOIN user_constraints c1 ON(p.constraint_name=c1.r_constraint_name)
        OR p.constraint_type='U')
        AND c1.constraint_type='R'
        AND p.table_name=UPPER(c.table_name)
            dbms_output.put_line('. Disable the constraint ' || d.Child_Constraint ||' (on table '||d.owner || '.' ||
            d.Child_Table || ')') ;
            dbms_utility.exec_ddl_statement('alter table ' || d.owner || '.' ||d.Child_Table || ' disable constraint ' ||
            d.Child_Constraint) ;
        END LOOP;

Object cannot be cast from DBNull to other types

I faced this problem today and resolved it by checking the mapping class. I had a class which had 5 properties to which 5 columns returned from stored procedure were being mapped. Those properties were non-nullable and due to which i was getting the error. I made them nullable and the issue resolved.

    public int? Pause { get; set; }
    public int? Delay { get; set; }
    public int? Transition { get; set; }
    public int? TransitionTime { get; set; }
    public int? TransitionResolution { get; set; }

Added "?" with data type to made them nullable.

Secondly i also added isNull check in the stored procedure as well as follows:

    isnull(co_pivot.Pause, 0) as Pause,
    isnull(co_pivot.Delay, 0) as Delay,
    isnull(co_pivot.Transition, 0) as Transition,
    isnull(co_pivot.TransitionTime, 0) as TransitionTime,
    isnull(co_pivot.TransitionResolution, 0) as TransitionResolution

Hope this helps someone.

Google Maps API Multiple Markers with Infowindows

Source Link

Demo Link

The following code will show Multiple Markers with InfoWindow. You can Uncomment code to show Info on Hover as well

enter image description here

            var map;
            var InforObj = [];
            var centerCords = {
                lat: -25.344,
                lng: 131.036
            var markersOnMap = [{
                    placeName: "Australia (Uluru)",
                    LatLng: [{
                        lat: -25.344,
                        lng: 131.036
                    placeName: "Australia (Melbourne)",
                    LatLng: [{
                        lat: -37.852086,
                        lng: 504.985963
                    placeName: "Australia (Canberra)",
                    LatLng: [{
                        lat: -35.299085,
                        lng: 509.109615
                    placeName: "Australia (Gold Coast)",
                    LatLng: [{
                        lat: -28.013044,
                        lng: 513.425586
                    placeName: "Australia (Perth)",
                    LatLng: [{
                        lat: -31.951994,
                        lng: 475.858081

            window.onload = function () {

            function addMarkerInfo() {
                for (var i = 0; i < markersOnMap.length; i++) {
                    var contentString = '<div id="content"><h1>' + markersOnMap[i].placeName +
                        '</h1><p>Lorem ipsum dolor sit amet, vix mutat posse suscipit id, vel ea tantas omittam detraxit.</p></div>';

                    const marker = new google.maps.Marker({
                        position: markersOnMap[i].LatLng[0],
                        map: map

                    const infowindow = new google.maps.InfoWindow({
                        content: contentString,
                        maxWidth: 200

                    marker.addListener('click', function () {
              'map'), marker);
                        InforObj[0] = infowindow;
                    // marker.addListener('mouseover', function () {
                    //     closeOtherInfo();
                    //'map'), marker);
                    //     InforObj[0] = infowindow;
                    // });
                    // marker.addListener('mouseout', function () {
                    //     closeOtherInfo();
                    //     infowindow.close();
                    //     InforObj[0] = infowindow;
                    // });

            function closeOtherInfo() {
                if (InforObj.length > 0) {
                    InforObj[0].set("marker", null);
                    InforObj.length = 0;

            function initMap() {
                map = new google.maps.Map(document.getElementById('map'), {
                    zoom: 4,
                    center: centerCords

How would I access variables from one class to another?

var1 and var2 are instance variables. That means that you have to send the instance of ClassA to ClassB in order for ClassB to access it, i.e:

class ClassA(object):
    def __init__(self):
        self.var1 = 1
        self.var2 = 2

    def methodA(self):
        self.var1 = self.var1 + self.var2
        return self.var1

class ClassB(ClassA):
    def __init__(self, class_a):
        self.var1 = class_a.var1
        self.var2 = class_a.var2

object1 = ClassA()
sum = object1.methodA()
object2 = ClassB(object1)
print sum

On the other hand - if you were to use class variables, you could access var1 and var2 without sending object1 as a parameter to ClassB.

class ClassA(object):
    var1 = 0
    var2 = 0
    def __init__(self):
        ClassA.var1 = 1
        ClassA.var2 = 2

    def methodA(self):
        ClassA.var1 = ClassA.var1 + ClassA.var2
        return ClassA.var1

class ClassB(ClassA):
    def __init__(self):
        print ClassA.var1
        print ClassA.var2

object1 = ClassA()
sum = object1.methodA()
object2 = ClassB()
print sum

Note, however, that class variables are shared among all instances of its class.

Open Bootstrap Modal from code-behind

This method of opening the Modal would not display the Modal for me. I found this as a work arround.

I removed:

 ScriptManager.RegisterStartupScript(this,this.GetType(),"Pop", "openModal();", true);

Than I added an asp:label named lblJavaScript and in code behind call:

lblJavaScript.Text = "<script language=\"JavaScript\">openModal()</script>";

Now the Modal will display.

Partly cherry-picking a commit with Git

Building on Mike Monkiewicz answer you can also specify a single or more files to checkout from the supplied sha1/branch.

git checkout -p bc66559 -- path/to/ 

This will allow you to interactively pick the changes you want to have applied to your current version of the file.

In C, how should I read a text file and print all strings

You can use fgets and limit the size of the read string.

char *fgets(char *str, int num, FILE *stream);

You can change the while in your code to:

while (fgets(str, 100, file)) /* printf("%s", str) */;

The client and server cannot communicate, because they do not possess a common algorithm - ASP.NET C# IIS TLS 1.0 / 1.1 / 1.2 - Win32Exception

I fixed this error by upgrading the app from .Net Framework 4.5 to 4.6.2.

TLS-1.2 was correctly installed on the server, and older versions like TLS-1.1 were disabled. However, .Net 4.5 does not support TLS-1.2.

Which version of Python do I have installed?

If you are already in a REPL window and don't see the welcome message with the version number, you can use help() to see the major and minor version:

Welcome to Python 3.6's help utility!

Multidimensional Lists in C#

Where does the variable results come from?

This block:

foreach (People p in ppl.results) {

Should probably read more like:

foreach (People p in ppl.results) {
    var list = new List<string>();

Jackson - Deserialize using generic class

You can wrap it in another class which knows the type of your generic type.


class Wrapper {
 private Data<Something> data;
mapper.readValue(jsonString, Wrapper.class);

Here Something is a concrete type. You need a wrapper per reified type. Otherwise Jackson does not know what objects to create.

HTML5 Audio Looping

This works and it is a lot easier to toggle that the methods above:

use inline: onended="if($(this).attr('data-loop')){ this.currentTime = 0;; }"

Turn the looping on by $(audio_element).attr('data-loop','1'); Turn the looping off by $(audio_element).removeAttr('data-loop');

Ignore cells on Excel line graph

  1. In the value or values you want to separate, enter the =NA() formula. This will appear that the value is skipped but the preceding and following data points will be joined by the series line.
  2. Enter the data you want to skip in the same location as the original (row or column) but add it as a new series. Add the new series to your chart.
  3. Format the new data point to match the original series format (color, shape, etc.). It will appear as though the data point was just skipped in the original series but will still show on your chart if you want to label it or add a callout.

Finding sum of elements in Swift array

Swift3 has changed to :

let multiples = [...]
sum = multiples.reduce(0, +)

What exactly is a Context in Java?

since you capitalized the word, I assume you are referring to the interface javax.naming.Context. A few classes implement this interface, and at its simplest description, it (generically) is a set of name/object pairs.

Using python map and other functional tools

Here's the solution you're looking for:

>>> foos = [1.0, 2.0, 3.0, 4.0, 5.0]
>>> bars = [1, 2, 3]
>>> [(x, bars) for x in foos]
[(1.0, [1, 2, 3]), (2.0, [1, 2, 3]), (3.0, [1, 2, 3]), (4.0, [1, 2, 3]), (5.0, [
1, 2, 3])]

I'd recommend using a list comprehension (the [(x, bars) for x in foos] part) over using map as it avoids the overhead of a function call on every iteration (which can be very significant). If you're just going to use it in a for loop, you'll get better speeds by using a generator comprehension:

>>> y = ((x, bars) for x in foos)
>>> for z in y:
...     print z
(1.0, [1, 2, 3])
(2.0, [1, 2, 3])
(3.0, [1, 2, 3])
(4.0, [1, 2, 3])
(5.0, [1, 2, 3])

The difference is that the generator comprehension is lazily loaded.

UPDATE In response to this comment:

Of course you know, that you don't copy bars, all entries are the same bars list. So if you modify any one of them (including original bars), you modify all of them.

I suppose this is a valid point. There are two solutions to this that I can think of. The most efficient is probably something like this:

tbars = tuple(bars)
[(x, tbars) for x in foos]

Since tuples are immutable, this will prevent bars from being modified through the results of this list comprehension (or generator comprehension if you go that route). If you really need to modify each and every one of the results, you can do this:

from copy import copy
[(x, copy(bars)) for x in foos]

However, this can be a bit expensive both in terms of memory usage and in speed, so I'd recommend against it unless you really need to add to each one of them.

How to stop an app on Heroku?

You can disable the app using enable maintenance mode from the admin panel.

  • Go to settings tabs.
  • In bottom just before deleting the app. enable maintenance mode. see in the screenshot below.

enter image description here

Dynamic loading of images in WPF

This is strange behavior and although I am unable to say why this is occurring, I can recommend some options.

First, an observation. If you include the image as Content in VS and copy it to the output directory, your code works. If the image is marked as None in VS and you copy it over, it doesn't work.

Solution 1: FileStream

The BitmapImage object accepts a UriSource or StreamSource as a parameter. Let's use StreamSource instead.

        FileStream stream = new FileStream("picture.png", FileMode.Open, FileAccess.Read);
        Image i = new Image();
        BitmapImage src = new BitmapImage();
        src.StreamSource = stream;
        i.Source = src;
        i.Stretch = Stretch.Uniform;

The problem: stream stays open. If you close it at the end of this method, the image will not show up. This means that the file stays write-locked on the system.

Solution 2: MemoryStream

This is basically solution 1 but you read the file into a memory stream and pass that memory stream as the argument.

        MemoryStream ms = new MemoryStream();
        FileStream stream = new FileStream("picture.png", FileMode.Open, FileAccess.Read);
        stream.Read(ms.GetBuffer(), 0, (int)stream.Length);


        Image i = new Image();
        BitmapImage src = new BitmapImage();
        src.StreamSource = ms;
        i.Source = src;
        i.Stretch = Stretch.Uniform;

Now you are able to modify the file on the system, if that is something you require.

Recursively look for files with a specific extension

To find all the pom.xml files in your current directory and print them, you can use:

find . -name 'pom.xml' -print

Installing Python packages from local file system folder to virtualenv with pip

Assuming you have virtualenv and a requirements.txt file, then you can define inside this file where to get the packages:

# Published pypi packages 
# Remote GIT repo package, this will install as django-bootstrap-themes
# Local GIT repo package, this will install as django-knowledge

SQLite add Primary Key


This is based on Android's java and it's a good example on changing the database without annoying your application fans/customers. This is based on the idea of the SQLite FAQ page

The problem

I did not notice that I need to set a row_number or record_id to delete a single purchased item in a receipt, and at same time the item barcode number fooled me into thinking of making it as the key to delete that item. I am saving a receipt details in the table receipt_barcode. Leaving it without a record_id can mean deleting all records of the same item in a receipt if I used the item barcode as the key.


Please understand that this is a copy-paste of my code I am work on at the time of this writing. Use it only as an example, copy-pasting randomly won't help you. Modify this first to your needs

Also please don't forget to read the comments in the code .

The Code

Use this as a method in your class to check 1st whether the column you want to add is missing . We do this just to not repeat the process of altering the table receipt_barcode. Just mention it as part of your class. In the next step you'll see how we'll use it.

public boolean is_column_exists(SQLiteDatabase mDatabase , String table_name,
String     column_name) {
    //checks if table_name has column_name
    Cursor cursor = mDatabase.rawQuery("pragma table_info("+table_name+")",null);
    while (cursor.moveToNext()){
    if (cursor.getString(cursor.getColumnIndex("name")).equalsIgnoreCase(column_name)) return true;
    return false;

Then , the following code is used to create the table receipt_barcode if it already does NOT exit for the 1st time users of your app. And please notice the "IF NOT EXISTS" in the code. It has importance.

//mDatabase should be defined as a Class member (global variable) 
//for ease of access : 
//SQLiteDatabse mDatabase=SQLiteDatabase.openOrCreateDatabase(dbfile_path, null);
creation_query = " CREATE TABLE if not exists receipt_barcode ( ";
creation_query += "\n record_id        INTEGER PRIMARY KEY AUTOINCREMENT,";
creation_query += "\n rcpt_id INT( 11 )       NOT NULL,";
creation_query += "\n barcode VARCHAR( 255 )  NOT NULL ,";
creation_query += "\n barcode_price VARCHAR( 255 )  DEFAULT (0),";
creation_query += "\n PRIMARY KEY ( record_id ) );";

//This is where the important part comes in regarding the question in this page:

//adding the missing primary key record_id in table receipt_barcode for older versions
        if (!is_column_exists(mDatabase, "receipt_barcode","record_id")){
                Log.e("record_id", "creating");

                 creation_query="CREATE TEMPORARY TABLE t1_backup(";
                 creation_query+="record_id INTEGER        PRIMARY KEY AUTOINCREMENT,";
                 creation_query+="rcpt_id INT( 11 )       NOT NULL,";
                 creation_query+="barcode VARCHAR( 255 )  NOT NULL ,";
                 creation_query+="barcode_price VARCHAR( 255 )  NOT NULL DEFAULT (0) );";

                 creation_query="INSERT INTO t1_backup(rcpt_id,barcode,barcode_price) SELECT rcpt_id,barcode,barcode_price  FROM receipt_barcode;";

                 creation_query="DROP TABLE receipt_barcode;";

                 creation_query="CREATE TABLE receipt_barcode (";
                 creation_query+="record_id INTEGER        PRIMARY KEY AUTOINCREMENT,";
                 creation_query+="rcpt_id INT( 11 )       NOT NULL,";
                 creation_query+="barcode VARCHAR( 255 )  NOT NULL ,";
                 creation_query+="barcode_price VARCHAR( 255 )  NOT NULL DEFAULT (0) );";

                 creation_query="INSERT INTO receipt_barcode(record_id,rcpt_id,barcode,barcode_price) SELECT record_id,rcpt_id,barcode,barcode_price  FROM t1_backup;";

                 creation_query="DROP TABLE t1_backup;";

            } catch (Exception exception ){
                Log.e("table receipt_bracode", "Table receipt_barcode did not get a primary key (record_id");
            } finally {

How to create a button programmatically?

For create UIButton from storyboard: 1 - Drag UIButton object from Object Library to ViewController in storyboard file 2 - Show Assistant editor 3 - Drag with right click from UIButton create above into your class. The result is the following:

@IBAction func buttonActionFromStoryboard(sender: UIButton)
    println("Button Action From Storyboard")

For create UIButton programmatically: 1- Write into "override func viewDidLoad()":

        let uiButton    = UIButton.buttonWithType(UIButtonType.System) as UIButton
        uiButton.frame  = CGRectMake(16, 116, 288, 30)
        uiButton.setTitle("Second", forState: UIControlState.Normal);
        uiButton.addTarget(self, action: "buttonActionFromCode:", forControlEvents: UIControlEvents.TouchUpInside)

2- add the IBAction func:

@IBAction func buttonActionFromCode(sender:UIButton)
    println("Button Action From Code")

How to disable javax.swing.JButton in java?

This works.

public class TestButton {

public TestButton() {
    JFrame f = new JFrame();
    f.setSize(new Dimension(200,200));
    JPanel p = new JPanel();
    p.setLayout(new FlowLayout());

    final JButton stop = new JButton("Stop");
    final JButton start = new JButton("Start");
    stop.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {


    start.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {


 * @param args
public static void main(String[] args) {
    new TestButton();



Remove warning messages in PHP

I do it as follows in my php.ini:

error_reporting = E_ALL & ~E_WARNING  & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED

This logs only fatal errors and no warnings.

Include CSS and Javascript in my django template

Read this

For local development, if you are using runserver or adding staticfiles_urlpatterns to your URLconf, you’re done with the setup – your static files will automatically be served at the default (for newly created projects) STATIC_URL of /static/.

And try:

~/tmp$ startproject myprj
~/tmp$ cd myprj/
~/tmp/myprj$ chmod a+x
~/tmp/myprj$ ./ startapp myapp

Then add 'myapp' to INSTALLED_APPS (myprj/

~/tmp/myprj$ cd myapp/
~/tmp/myprj/myapp$ mkdir static
~/tmp/myprj/myapp$ echo 'alert("hello!");' > static/hello.js
~/tmp/myprj/myapp$ mkdir templates
~/tmp/myprj/myapp$ echo '<script src="{{ STATIC_URL }}hello.js"></script>' > templates/hello.html

Edit myprj/

from django.conf.urls import patterns, include, url
from django.views.generic import TemplateView

class HelloView(TemplateView):
    template_name = "hello.html"

urlpatterns = patterns('',
    url(r'^$', HelloView.as_view(), name='hello'),

And run it:

~/tmp/myprj/myapp$ cd ..
~/tmp/myprj$ ./ runserver

It works!

Can scripts be inserted with innerHTML?

You have to use eval() to execute any script code that you've inserted as DOM text.

MooTools will do this for you automatically, and I'm sure jQuery would as well (depending on the version. jQuery version 1.6+ uses eval). This saves a lot of hassle of parsing out <script> tags and escaping your content, as well as a bunch of other "gotchas".

Generally if you're going to eval() it yourself, you want to create/send the script code without any HTML markup such as <script>, as these will not eval() properly.

JTable won't show column headers

    public table2() {
    setBounds(100, 100, 485, 218);

    String data[][] = { { "Row1/1", "Row1/2", "Row1/3" },
            { "Row2/1", "Row2/2", "Row2/3" },
            { "Row3/1", "Row3/2", "Row3/3" },
            { "Row4/1", "Row4/2", "Row4/3" }, };

    String header[] = { "Column 1", "Column 2", "Column 3" };

    // Table
    JTable table = new JTable(data,header);

    // ScrollPane
    JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setBounds(36, 37, 407, 79);



try this!!

Defining constant string in Java?

You can use

 public static final String HELLO = "hello";

if you have many string constants, you can use external property file / simple "constant holder" class

JUnit Eclipse Plugin?

You might want to try out Quick JUnit:

The plugin is stable and it allows switching between production and test code. I am currently using Eclipse Mars 4.5 and the plugin is supported for this release as well as for the following:

Luna (4.4), Kepler (4.3), Juno (4.2, 3.8), Previous to Juno (<=4.1)

Find what 2 numbers add to something and multiply to something

That's basically a set of 2 simultaneous equations:

x*y = a
X+y = b

(using the mathematical convention of x and y for the variables to solve and a and b for arbitrary constants).

But the solution involves a quadratic equation (because of the x*y), so depending on the actual values of a and b, there may not be a solution, or there may be multiple solutions.

Algorithm to detect overlapping periods

Try this. This method will determine if (two) date spans are overlapping, regardless of the ordering of the method's input arguments. This can also be used with more than two date spans, by individually checking each date span combination (ex. with 3 date spans, run span1 against span2, span2 against span3, and span1 against span3):

public static class HelperFunctions
    public static bool AreSpansOverlapping(Tuple<DateTime,DateTime> span1, Tuple<DateTime,DateTime> span2, bool includeEndPoints)
        if (span1 == null || span2 == null)
            return false;
        else if ((new DateTime[] { span1.Item1, span1.Item2, span2.Item1, span2.Item2 }).Any(v => v == DateTime.MinValue))
            return false;
            if (span1.Item1 > span1.Item2)
                span1 = new Tuple<DateTime, DateTime>(span1.Item2, span1.Item1);
            if (span2.Item1 > span2.Item2)
                span2 = new Tuple<DateTime, DateTime>(span2.Item2, span2.Item1);

            if (includeEndPoints)
                    (span1.Item1 <= span2.Item1 && span1.Item2 >= span2.Item1) 
                    || (span1.Item1 <= span2.Item2 && span1.Item2 >= span2.Item2)
                ) || (
                    (span2.Item1 <= span1.Item1 && span2.Item2 >= span1.Item1) 
                    || (span2.Item1 <= span1.Item2 && span2.Item2 >= span1.Item2)
                    (span1.Item1 < span2.Item1 && span1.Item2 > span2.Item1) 
                    || (span1.Item1 < span2.Item2 && span1.Item2 > span2.Item2)
                ) || (
                    (span2.Item1 < span1.Item1 && span2.Item2 > span1.Item1) 
                    || (span2.Item1 < span1.Item2 && span2.Item2 > span1.Item2)
                ) || (
                    span1.Item1 == span2.Item1 && span1.Item2 == span2.Item2


static void Main(string[] args)
    Random r = new Random();

    DateTime d1;
    DateTime d2;
    DateTime d3;
    DateTime d4;

    for (int i = 0; i < 100; i++)
        d1 = new DateTime(2012,1, r.Next(1,31));
        d2 = new DateTime(2012,1, r.Next(1,31));
        d3 = new DateTime(2012,1, r.Next(1,31));
        d4 = new DateTime(2012,1, r.Next(1,31));

        Console.WriteLine("span1 = " + d1.ToShortDateString() + " to " + d2.ToShortDateString());
        Console.WriteLine("span2 = " + d3.ToShortDateString() + " to " + d4.ToShortDateString());
            new Tuple<DateTime, DateTime>(d1, d2),
            new Tuple<DateTime, DateTime>(d3, d4),
            true    //or use False, to ignore span's endpoints


Where does Jenkins store configuration files for the jobs it runs?

The best approach would be to keep your job configurations in a Jenkinsfile that live in source control.

How to check if an element is visible with WebDriver

If you're using C#, it would be driver.Displayed. Here's an example from my own project:

if (!driver.FindElement(By.Name("newtagfield")).Displayed)      //if the tag options is not displayed
    driver.FindElement(By.Id("expand-folder-tags")).Click();    //make sure the folder and tags options are visible

Java Process with Input/Output Stream

Firstly, I would recommend replacing the line

Process process = Runtime.getRuntime ().exec ("/bin/bash");

with the lines

ProcessBuilder builder = new ProcessBuilder("/bin/bash");
Process process = builder.start();

ProcessBuilder is new in Java 5 and makes running external processes easier. In my opinion, its most significant improvement over Runtime.getRuntime().exec() is that it allows you to redirect the standard error of the child process into its standard output. This means you only have one InputStream to read from. Before this, you needed to have two separate Threads, one reading from stdout and one reading from stderr, to avoid the standard error buffer filling while the standard output buffer was empty (causing the child process to hang), or vice versa.

Next, the loops (of which you have two)

while ((line = reader.readLine ()) != null) {
    System.out.println ("Stdout: " + line);

only exit when the reader, which reads from the process's standard output, returns end-of-file. This only happens when the bash process exits. It will not return end-of-file if there happens at present to be no more output from the process. Instead, it will wait for the next line of output from the process and not return until it has this next line.

Since you're sending two lines of input to the process before reaching this loop, the first of these two loops will hang if the process hasn't exited after these two lines of input. It will sit there waiting for another line to be read, but there will never be another line for it to read.

I compiled your source code (I'm on Windows at the moment, so I replaced /bin/bash with cmd.exe, but the principles should be the same), and I found that:

  • after typing in two lines, the output from the first two commands appears, but then the program hangs,
  • if I type in, say, echo test, and then exit, the program makes it out of the first loop since the cmd.exe process has exited. The program then asks for another line of input (which gets ignored), skips straight over the second loop since the child process has already exited, and then exits itself.
  • if I type in exit and then echo test, I get an IOException complaining about a pipe being closed. This is to be expected - the first line of input caused the process to exit, and there's nowhere to send the second line.

I have seen a trick that does something similar to what you seem to want, in a program I used to work on. This program kept around a number of shells, ran commands in them and read the output from these commands. The trick used was to always write out a 'magic' line that marks the end of the shell command's output, and use that to determine when the output from the command sent to the shell had finished.

I took your code and I replaced everything after the line that assigns to writer with the following loop:

while (scan.hasNext()) {
    String input = scan.nextLine();
    if (input.trim().equals("exit")) {
        // Putting 'exit' amongst the echo --EOF--s below doesn't work.
    } else {
        writer.write("((" + input + ") && echo --EOF--) || echo --EOF--\n");

    line = reader.readLine();
    while (line != null && ! line.trim().equals("--EOF--")) {
        System.out.println ("Stdout: " + line);
        line = reader.readLine();
    if (line == null) {

After doing this, I could reliably run a few commands and have the output from each come back to me individually.

The two echo --EOF-- commands in the line sent to the shell are there to ensure that output from the command is terminated with --EOF-- even in the result of an error from the command.

Of course, this approach has its limitations. These limitations include:

  • if I enter a command that waits for user input (e.g. another shell), the program appears to hang,
  • it assumes that each process run by the shell ends its output with a newline,
  • it gets a bit confused if the command being run by the shell happens to write out a line --EOF--.
  • bash reports a syntax error and exits if you enter some text with an unmatched ).

These points might not matter to you if whatever it is you're thinking of running as a scheduled task is going to be restricted to a command or a small set of commands which will never behave in such pathological ways.

EDIT: improve exit handling and other minor changes following running this on Linux.

Center align a column in twitter bootstrap

With bootstrap 3 the best way to go about achieving what you want is ...with offsetting columns. Please see these examples for more detail:

In short, and without seeing your divs here's an example what might help, without using any custom classes. Just note how the "col-6" is used and how half of that is 3 the "offset-3" is used. Splitting equally will allow the centered spacing you're going for:

<div class="container">
<div class="col-sm-6 col-sm-offset-3">
your centered, floating column

Ruby/Rails: converting a Date to a UNIX timestamp

The suggested options of using to_utc or utc to fix the local time offset does not work. For me I found using Time.utc() worked correctly and the code involves less steps:

> Time.utc(2016, 12, 25).to_i
=> 1482624000 # correct


>, 12, 25).to_time.utc.to_i
=> 1482584400 # incorrect

Here is what happens when you call utc after using Date....

>, 12, 25).to_time
=> 2016-12-25 00:00:00 +1100 # This will use your system's time offset
>, 12, 25).to_time.utc
=> 2016-12-24 13:00:00 UTC clearly calling to_i is going to give the wrong timestamp.

Documentation for using JavaScript code inside a PDF file

I'm pretty sure it's an Adobe standard, bearing in mind the whole PDF standard is theirs to begin with; despite being open now.

My guess would be no for all PDF viewers supporting it, as some definitely will not have a JS engine. I doubt you can rely on full support outside the most recent versions of Acrobat (Reader). So I guess it depends on how you imagine it being used, if mainly via a browser display, then the majority of the market is catered for by Acrobat (Reader) and Chrome's built-in viewer - dare say there is documentation on whether Chrome's PDF viewer supports JS fully.

The endpoint reference (EPR) for the Operation not found is

Late answer but:

I see you do a GET - should be a POST ?

Capture screenshot of active window?

ScreenCapture sc = new ScreenCapture();
// capture entire screen, and save it to a file
Image img = sc.CaptureScreen();
// display image in a Picture control named imageDisplay
this.imageDisplay.Image = img;
// capture this window, and save it

Odd behavior when Java converts int to byte?

Two's complement Equation:

enter image description here

In Java, byte (N=8) and int (N=32) are represented by the 2s-complement shown above.

From the equation, a7 is negative for byte but positive for int.

coef:   a7    a6  a5  a4  a3  a2  a1  a0
Binary: 1     0   0   0   0   1   0   0
int:    128 + 0 + 0 + 0 + 0 + 4 + 0 + 0 =  132
byte:  -128 + 0 + 0 + 0 + 0 + 4 + 0 + 0 = -124

Call a React component method from outside

I use this helper method to render components and return an component instance. Methods can be called on that instance.

static async renderComponentAt(componentClass, props, parentElementId){
         let componentId =;
            throw Error('Component has no id property. Please include id:"" to component properties.');

        let parentElement = document.getElementById(parentElementId);

        return await new Promise((resolve, reject) => {
            props.ref = (component)=>{
            let element = React.createElement(componentClass, props, null);
            ReactDOM.render(element, parentElement);

ssh remote host identification has changed


ssh-keygen -R [hostname]

Example with an ip address/hostname would be:

ssh-keygen -R

This will update the offending of your host from the known_hosts. You can also provide the path of the known_hosts with -f flag.

@RequestBody and @ResponseBody annotations in Spring

package com.programmingfree.springshop.controller;

import java.util.List;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.programmingfree.springshop.dao.UserShop;
import com.programmingfree.springshop.domain.User;

public class SpringShopController {

 UserShop userShop=new UserShop();

 @RequestMapping(value = "/{id}", method = RequestMethod.GET,headers="Accept=application/json")
 public User getUser(@PathVariable int id) {
  User user=userShop.getUserById(id);
  return user;

 @RequestMapping(method = RequestMethod.GET,headers="Accept=application/json")
 public List<User> getAllUsers() {
  List<User> users=userShop.getAllUsers();
  return users;


In the above example they going to display all user and particular id details now I want to use both id and name,

1) localhost:8093/plejson/shop/user <---this link will display all user details
2) localhost:8093/plejson/shop/user/11 <----if i use 11 in link means, it will display particular user 11 details

now I want to use both id and name

localhost:8093/plejson/shop/user/11/raju <-----------------like this it means we can use any one in this please help me out.....

How to save a list as numpy array in python?

You can use numpy.asarray, for example to convert a list into an array:

>>> a = [1, 2]
>>> np.asarray(a)
array([1, 2])

How to sort alphabetically while ignoring case sensitive?

Pass java.text.Collator.getInstance() to Collections.sort method ; it will sort Alphabetically while ignoring case sensitive.

        ArrayList<String> myArray = new ArrayList<String>();

Generate SHA hash in C++ using OpenSSL library

OpenSSL has a horrible documentation with no code examples, but here you are:

#include <openssl/sha.h>

bool simpleSHA256(void* input, unsigned long length, unsigned char* md)
    SHA256_CTX context;
        return false;

    if(!SHA256_Update(&context, (unsigned char*)input, length))
        return false;

    if(!SHA256_Final(md, &context))
        return false;

    return true;


unsigned char md[SHA256_DIGEST_LENGTH]; // 32 bytes
if(!simpleSHA256(<data buffer>, <data length>, md))
    // handle error

Afterwards, md will contain the binary SHA-256 message digest. Similar code can be used for the other SHA family members, just replace "256" in the code.

If you have larger data, you of course should feed data chunks as they arrive (multiple SHA256_Update calls).

Correct use of flush() in JPA/Hibernate

Probably the exact details of em.flush() are implementation-dependent. In general anyway, JPA providers like Hibernate can cache the SQL instructions they are supposed to send to the database, often until you actually commit the transaction. For example, you call em.persist(), Hibernate remembers it has to make a database INSERT, but does not actually execute the instruction until you commit the transaction. Afaik, this is mainly done for performance reasons.

In some cases anyway you want the SQL instructions to be executed immediately; generally when you need the result of some side effects, like an autogenerated key, or a database trigger.

What em.flush() does is to empty the internal SQL instructions cache, and execute it immediately to the database.

Bottom line: no harm is done, only you could have a (minor) performance hit since you are overriding the JPA provider decisions as regards the best timing to send SQL instructions to the database.

Get records with max value for each group of grouped SQL results

Using ranking method.

SELECT @rn :=  CASE WHEN @prev_grp <> groupa THEN 1 ELSE @rn+1 END AS rn,  
   @prev_grp :=groupa,
FROM   users,(SELECT @rn := 0) r        
ORDER  BY groupa,age DESC,person

This sql can be explained as below,

  1. select * from users, (select @rn := 0) r order by groupa, age desc, person

  2. @prev_grp is null

  3. @rn := CASE WHEN @prev_grp <> groupa THEN 1 ELSE @rn+1 END

    this is a three operator expression
    like this, rn = 1 if prev_grp != groupa else rn=rn+1

  4. having rn=1 filter out the row you need

Is there a way to get rid of accents and convert a whole string to regular letters?

The solution by @virgo47 is very fast, but approximate. The accepted answer uses Normalizer and a regular expression. I wondered what part of the time was taken by Normalizer versus the regular expression, since removing all the non-ASCII characters can be done without a regex:

import java.text.Normalizer;

public class Strip {
    public static String flattenToAscii(String string) {
        StringBuilder sb = new StringBuilder(string.length());
        string = Normalizer.normalize(string, Normalizer.Form.NFD);
        for (char c : string.toCharArray()) {
            if (c <= '\u007F') sb.append(c);
        return sb.toString();

Small additional speed-ups can be obtained by writing into a char[] and not calling toCharArray(), although I'm not sure that the decrease in code clarity merits it:

public static String flattenToAscii(String string) {
    char[] out = new char[string.length()];
    string = Normalizer.normalize(string, Normalizer.Form.NFD);
    int j = 0;
    for (int i = 0, n = string.length(); i < n; ++i) {
        char c = string.charAt(i);
        if (c <= '\u007F') out[j++] = c;
    return new String(out);

This variation has the advantage of the correctness of the one using Normalizer and some of the speed of the one using a table. On my machine, this one is about 4x faster than the accepted answer, and 6.6x to 7x slower that @virgo47's (the accepted answer is about 26x slower than @virgo47's on my machine).

Why aren't python nested functions called closures?

I had a situation where I needed a separate but persistent name space. I used classes. I don't otherwise. Segregated but persistent names are closures.

>>> class f2:
...     def __init__(self):
...         self.a = 0
...     def __call__(self, arg):
...         self.a += arg
...         return(self.a)
>>> f=f2()
>>> f(2)
>>> f(2)
>>> f(4)
>>> f(8)

# **OR**
>>> f=f2() # **re-initialize**
>>> f(f(f(f(2)))) # **nested**

# handy in list comprehensions to accumulate values
>>> [f(i) for f in [f2()] for i in [2,2,4,8]][-1] 

Get properties and values from unknown object

Yes, Reflection would be the way to go. First, you would get the Type that represents the type (at runtime) of the instance in the list. You can do this by calling the GetType method on Object. Because it is on the Object class, it's callable by every object in .NET, as all types derive from Object (well, technically, not everything, but that's not important here).

Once you have the Type instance, you can call the GetProperties method to get the PropertyInfo instances which represent the run-time informationa about the properties on the Type.

Note, you can use the overloads of GetProperties to help classify which properties you retrieve.

From there, you would just write the information out to a file.

Your code above, translated, would be:

// The instance, it can be of any type.
object o = <some object>;

// Get the type.
Type type = o.GetType();

// Get all public instance properties.
// Use the override if you want to classify
// which properties to return.
foreach (PropertyInfo info in type.GetProperties())
    // Do something with the property info.

Note that if you want method information or field information, you would have to call the one of the overloads of the GetMethods or GetFields methods respectively.

Also note, it's one thing to list out the members to a file, but you shouldn't use this information to drive logic based on property sets.

Assuming you have control over the implementations of the types, you should derive from a common base class or implement a common interface and make the calls on those (you can use the as or is operator to help determine which base class/interface you are working with at runtime).

However, if you don't control these type definitions and have to drive logic based on pattern matching, then that's fine.

How to convert hex to ASCII characters in the Linux shell?

There is a simple shell command "ascii",

if you use Ubuntu,just

sudo apt install ascii


ascii 0x5a

will output:

ASCII 5/10 is decimal 090, hex 5a, octal 132, bits 01011010: prints as `Z'
Official name: Majuscule Z
Other names: Capital Z, Uppercase Z

Entry point for Java applications: main(), init(), or run()?

This is a peculiar question because it's not supposed to be a matter of choice.

When you launch the JVM, you specify a class to run, and it is the main() of this class where your program starts.

By init(), I assume you mean the JApplet method. When an applet is launched in the browser, the init() method of the specified applet is executed as the first order of business.

By run(), I assume you mean the method of Runnable. This is the method invoked when a new thread is started.

  • main: program start
  • init: applet start
  • run: thread start

If Eclipse is running your run() method even though you have no main(), then it is doing something peculiar and non-standard, but not infeasible. Perhaps you should post a sample class that you've been running this way.

Best way to reset an Oracle sequence to the next value in an existing column?

These two procedures let me reset the sequence and reset the sequence based on data in a table (apologies for the coding conventions used by this client):

   l_num   NUMBER;
   EXECUTE IMMEDIATE 'select ' || p_name || '.nextval from dual' INTO l_num;

   -- Added check for 0 to avoid "ORA-04002: INCREMENT must be a non-zero integer"
   IF (p_val - l_num - 1) != 0
      EXECUTE IMMEDIATE 'alter sequence ' || p_name || ' increment by ' || (p_val - l_num - 1) || ' minvalue 0';
   END IF;

   EXECUTE IMMEDIATE 'select ' || p_name || '.nextval from dual' INTO l_num;

   EXECUTE IMMEDIATE 'alter sequence ' || p_name || ' increment by 1 ';

   DBMS_OUTPUT.put_line('Sequence ' || p_name || ' is now at ' || p_val);

   nextnum   NUMBER;
   EXECUTE IMMEDIATE 'SELECT MAX(' || col_name || ') + 1 AS n FROM ' || table_name INTO nextnum;

   SET_SEQ_TO(seq_name, nextnum);

Android Studio 3.0 Execution failed for task: unable to merge dex

For me, the problem was the use of Java 1.8 in a module, but not in the app module. I added this to the app build gradle and worked:

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8

Run a Command Prompt command from Desktop Shortcut

This is an old post but I have issues with coming across posts that have some incorrect information/syntax...

If you wanted to do this with a shorcut icon you could just create a shortcut on your desktop for the cmd.exe application. Then append a /K {your command} to the shorcut path.

So a default shorcut target path may look like "%windir%\system32\cmd.exe", just change it to %windir%\system32\cmd.exe /k {commands}

example: %windir%\system32\cmd.exe /k powercfg -lastwake

In this case i would use /k (keep open) to display results.

Arlen was right about the /k (keep open) and /c (close)

You can open a command prompt and type "cmd /?" to see your options.

A batch file is kind of overkill for a single command prompt command...

Hope this helps someone else

Angular2 RC6: '<component> is not a known element'

Ok, let me give the details of code, how to use other module's component.

For example, I have M2 module, M2 module have comp23 component and comp2 component, Now I want to use comp23 and comp2 in app.module, here is how:

this is app.module.ts, see my comment,

 // import this module's ALL component, but not other module's component, only this module
  import { AppComponent } from './app.component';
  import { Comp1Component } from './comp1/comp1.component';

  // import all other module,
 import { SwModule } from './sw/sw.module';
 import { Sw1Module } from './sw1/sw1.module';
 import { M2Module } from './m2/m2.module';

   import { CustomerDashboardModule } from './customer-dashboard/customer-dashboard.module';


    // declare only this module's all component, not other module component.  

declarations: [


 // imports all other module only.
imports: [
CustomerDashboardModule // add the feature module here
 providers: [],
 bootstrap: [AppComponent]
export class AppModule { }

this is m2 module:

   import { NgModule } from '@angular/core';
   import { CommonModule } from '@angular/common';

   // must import this module's all component file
   import { Comp2Component } from './comp2/comp2.component';
   import { Comp23Component } from './comp23/comp23.component';


   // import all other module here.
     imports: [

    // declare only this module's child component. 
     declarations: [Comp2Component, Comp23Component],

   // for other module to use these component, must exports
     exports: [Comp2Component, Comp23Component]
   export class M2Module { }

My commend in code explain what you need to do here.

now in app.component.html, you can use


follow angular doc sample import modul

How to index into a dictionary?

Addressing an element of dictionary is like sitting on donkey and enjoy the ride.

As a rule of Python, a DICTIONARY is orderless

If there is

dic = {1: "a", 2: "aa", 3: "aaa"}

Now suppose if I go like dic[10] = "b", then it will not add like this always

dic = {1:"a",2:"aa",3:"aaa",10:"b"}

It may be like

dic = {1: "a", 2: "aa", 3: "aaa", 10: "b"}


dic = {1: "a", 2: "aa", 10: "b", 3: "aaa"}


dic = {1: "a", 10: "b", 2: "aa", 3: "aaa"}

Or any such combination.

So a rule of thumb is that a DICTIONARY is orderless!

Turn off textarea resizing

It can done easy by just using html draggable attribute

<textarea name="mytextarea" draggable="false"></textarea>

Default value is true.

LINQ select in C# dictionary

This will return all the values matching your key valueTitle

subList.SelectMany(m => m).Where(kvp => kvp.Key == "valueTitle").Select(k => k.Value).ToList();

How to compare DateTime in C#?

//Time compare.
private int CompareTime(string t1, string t2)
    TimeSpan s1 = TimeSpan.Parse(t1);
    TimeSpan s2 = TimeSpan.Parse(t2);
    return s2.CompareTo(s1);

Difference in days between two dates in Java?

I did it this way. it's easy :)

Date d1 = jDateChooserFrom.getDate();
Date d2 = jDateChooserTo.getDate();

Calendar day1 = Calendar.getInstance();

Calendar day2 = Calendar.getInstance();

int from = day1.get(Calendar.DAY_OF_YEAR);
int to = day2.get(Calendar.DAY_OF_YEAR);

int difference = to-from;

How to replace multiple substrings of a string?

I would like to propose the usage of string templates. Just place the string to be replaced in a dictionary and all is set! Example from

>>> from string import Template
>>> s = Template('$who likes $what')
>>> s.substitute(who='tim', what='kung pao')
'tim likes kung pao'
>>> d = dict(who='tim')
>>> Template('Give $who $100').substitute(d)
Traceback (most recent call last):
ValueError: Invalid placeholder in string: line 1, col 10
>>> Template('$who likes $what').substitute(d)
Traceback (most recent call last):
KeyError: 'what'
>>> Template('$who likes $what').safe_substitute(d)
'tim likes $what'

If Python is interpreted, what are .pyc files?

They contain byte code, which is what the Python interpreter compiles the source to. This code is then executed by Python's virtual machine.

Python's documentation explains the definition like this:

Python is an interpreted language, as opposed to a compiled one, though the distinction can be blurry because of the presence of the bytecode compiler. This means that source files can be run directly without explicitly creating an executable which is then run.

Node.JS: Getting error : [nodemon] Internal watch failed: watch ENOSPC

Try reopening VS code or Atom with more specific directory where your app.js is present. I had a lot of folders opened and this problem occured. But once I opened my specific folder and tried once again, it worked.

What is the &#xA; character?

That would be an HTML Encoded Line Feed character (using the hexadecimal value).

The decimal value would be &#10;

javascript how to create a validation error message without using alert

I would strongly suggest you start using jQuery. Your code would look like:

$(function() {
    $('form[name="myform"]').submit(function(e) {
        var username = $('form[name="myform"] input[name="username"]').val();
        if ( username == '') {
            $('#errors').text('*Please enter a username*');

How to detect when WIFI Connection has been established in Android?

I have two methods to detect WIFI connection receiving the application context:

1)my old method

public boolean isConnectedWifi1(Context context) {
    try {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();           
        if (networkInfo != null) {
            NetworkInfo[] netInfo = connectivityManager.getAllNetworkInfo();
            for (NetworkInfo ni : netInfo) {
                if ((ni.getTypeName().equalsIgnoreCase("WIFI"))
                        && ni.isConnected()) {
                    return true;
        return false;
    } catch (Exception e) {
        Log.e(TAG, e.getMessage());
    return false;

2)my New method (I´m currently using this method):

public boolean isConnectedWifi(Context context) {
         ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo networkInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);     
         return networkInfo.isConnected();

What does "wrong number of arguments (1 for 0)" mean in Ruby?

When you define a function, you also define what info (arguments) that function needs to work. If it is designed to work without any additional info, and you pass it some, you are going to get that error.

Example: Takes no arguments:

def dog

Takes arguments:

def cat(name)

When you call these, you need to call them with the arguments you defined.

dog                  #works fine
cat("Fluffy")        #works fine

dog("Fido")          #Returns ArgumentError (1 for 0)
cat                  #Returns ArgumentError (0 for 1)

Check out the Ruby Koans to learn all this.

Creating a dictionary from a CSV file

import csv
reader = csv.reader(open('filename.csv', 'r'))
d = {}
for row in reader:
   k, v = row
   d[k] = v

Slidedown and slideup layout with animation

I had a similar requirement in the app I am working on. And, I found a third-party library which does a slide-up, slide-down and slide-right in Android.

Refer to the link for more details:

To set up the library(copied from the ReadMe portion of its Github page on request):

Get SlideUp library

Add the JitPack repository to your build file. Add it in your root build.gradle at the end of repositories:

allprojects {
  repositories {
    maven { url '' }
    maven { url "" } // or google() in AS 3.0

Add the dependency (in the Module gradle)

dependencies {
    compile 'com.github.mancj:SlideUp-Android:2.2.1'
    compile 'ru.ztrap:RxSlideUp2:2.x.x' //optional, for reactive listeners based on RxJava-2
    compile 'ru.ztrap:RxSlideUp:1.x.x' //optional, for reactive listeners based on RxJava

To add the SlideUp into your project, follow these three simple steps:

Step 1:

create any type of layout


Step 2:

Find that view in your activity/fragment

View slideView = findViewById(;

Step 3:

Create a SlideUp object and pass in your view

slideUp = new SlideUpBuilder(slideView)


You may also refer to the sample project on the link. I found it quite useful.

C# constructors overloading

Maybe your class isn't quite complete. Personally, I use a private init() function with all of my overloaded constructors.

class Point2D {

  double X, Y;

  public Point2D(double x, double y) {
    init(x, y);

  public Point2D(Point2D point) {
    if (point == null)
      throw new ArgumentNullException("point");
    init(point.X, point.Y);

  void init(double x, double y) {
    // ... Contracts ...
    X = x;
    Y = y;

I have 2 dates in PHP, how can I run a foreach loop to go through all of those days?

This also includes the last date

$begin = new DateTime( "2015-07-03" );
$end   = new DateTime( "2015-07-09" );

for($i = $begin; $i <= $end; $i->modify('+1 day')){
    echo $i->format("Y-m-d");

If you dont need the last date just remove = from the condition.

How to check radio button is checked using JQuery?

jQuery 3.3.1

if (typeof $("input[name='yourRadioName']:checked").val() === "undefined") {
    alert('is not selected');
    alert('is selected');

What SOAP client libraries exist for Python, and where is the documentation for them?

As I suggested here I recommend you roll your own. It's actually not that difficult and I suspect that's the reason there aren't better Python SOAP libraries out there.

Wordpress plugin install: Could not create directory

The user that is running your web server does not have permissions to write to the directory that Wordpress is intending to create the plugin directory in. You should chown the directory in question to the user that is running Wordpress. It is most likely not root.

In short, this is a permissions issue. Your touch command is working because you're using it as root, and root has global permissions to write wherever it wants.

Reading from file using read() function

I am reading some data from a file using read. Here I am reading data in a 2d char pointer but the method is the same for the 1d also. Just read character by character and do not worry about the exceptions because the condition in the while loop is handling the exceptions :D

  while ( (n = read(fd, buffer,1)) > 0 )

if(buffer[0] == '\n')

  for(int a=0;a<r;a++)

  for(int a=0;a<r-1;a++)





PHP new line break in emails

I know this is an old question but anyway it might help someone.

I tend to use PHP_EOL for this purposes (due to cross-platform compatibility).

echo "line 1".PHP_EOL."line 2".PHP_EOL;

If you're planning to show the result in a browser then you have to use "<br>".

EDIT: since your exact question is about emails, things are a bit different. For pure text emails see Brendan Bullen's accepted answer. For HTML emails you simply use HTML formatting.

How to hide a div element depending on Model value? MVC


<div style="@(Model.booleanVariable ? "display:block" : "display:none")">Some links</div>

Use the "Display" style attribute with your bool model attribute to define the div's visibility.

Unable to Cast from Parent Class to Child Class

A variation on the serialization approach for those using ServiceStack:

var child = baseObject.ConvertTo<ChildType>();

or the more verbose:

var child = baseObject.ToJson().FromJson<ChildType>();

ServiceStack's serialization might be super fast and all, but clearly, this is not a solution for massive conversions in low-latency transfers, nor for highly complex types. That's likely obvious to anyone using ServiceStack, but thought I'd clarify in anticipation of comments.

Get decimal portion of a number with JavaScript

This function splits float number into integers and returns it in array:

function splitNumber(num)
  num = ("0" + num).match(/([0-9]+)([^0-9]([0-9]+))?/);
  return [ ~~num[1], ~~num[3] ];

console.log(splitNumber(3.2));     // [ 3, 2 ]
console.log(splitNumber(123.456)); // [ 123, 456 ]
console.log(splitNumber(789));     // [ 789, 0 ]
console.log(splitNumber("test"));  // [ 0, 0 ]

You can extend it to only return existing numbers and null if no number exists:

function splitNumber(num)
  num = ("" + num).match(/([0-9]+)([^0-9]([0-9]+))?/);
  return [num ? ~~num[1] : null, num && num[3] !== undefined ? ~~num[3] : null];

console.log(splitNumber(3.2));     // [ 3, 2 ]
console.log(splitNumber(123.456)); // [ 123, 456 ]
console.log(splitNumber(789));     // [ 789, null ]
console.log(splitNumber("test"));  // [ null, null ]

How do I convert a IPython Notebook into a Python file via commandline?

The following example turns an Iron Python Notebook called a_notebook.ipynb into a python script called leaving out the cells tagged with the keyword remove, which I add manually to the cells that I don't want to end up in the script, leaving out visualizations and other steps that once I am done with the notebook I don't need to be executed by the script.

import nbformat as nbf
from nbconvert.exporters import PythonExporter
from nbconvert.preprocessors import TagRemovePreprocessor

with open("a_notebook.ipynb", 'r', encoding='utf-8') as f:
    the_notebook_nodes =, as_version = 4)

trp = TagRemovePreprocessor()

trp.remove_cell_tags = ("remove",)

pexp = PythonExporter()

pexp.register_preprocessor(trp, enabled= True)

the_python_script, meta = pexp.from_notebook_node(the_notebook_nodes)

with open("", 'w') as f:

How can I enable MySQL's slow query log without restarting MySQL?

These work


Broken on my setup 5.1.42

set @@global.log_slow_queries=1;

Looks like the best way to do this is set log_slow_time very high thus "turning off" the slow query log. Lower log_slow_time to enable it. Use the same trick (set to OFF) for log_queries_not_using_indexes.

How can I assign the output of a function to a variable using bash?

I think init_js should use declare instead of local!

function scan3() {
    declare -n outvar=$1    # -n makes it a nameref.
    local nl=$'\x0a'
    outvar="output${nl}${nl}"  # two total. quotes preserve newlines

Can I add background color only for padding?

There is no exact functionality to do this.

Without wrapping another element inside, you could replace the border by a box-shadow and the padding by the border. But remember the box-shadow does not add to the dimensions of the element.

jsfiddle is being really slow, otherwise I'd add an example.

ComboBox- SelectionChanged event has old value, not new value

You can check SelectedIndex or SelectedValue or SelectedItem property in the SelectionChanged event of the Combobox control.

Mythical man month 10 lines per developer day - how close on large projects?

You should stop using this metric, it is meaningless for the most part. Cohesion, coupling and complexity are more important metrics than lines of code.

How do I check for equality using Spark Dataframe without SQL Query?

df.filter($"state" like "T%%") for pattern matching

df.filter($"state" === "TX") or df.filter("state = 'TX'") for equality

Facebook Graph API error code list

While there does not appear to be a public, Facebook-curated list of error codes available, a number of folks have taken it upon themselves to publish lists of known codes.

Take a look at StackOverflow #4348018 - List of Facebook error codes for a number of useful resources.

Convert String[] to comma separated string in java

Either write a simple method yourself, or use one of the various utilities out there.

Personally I use apache StringUtils (StringUtils.join)

edit: in Java 8, you don't need this at all anymore:

String joined = String.join(",", name);

What permission do I need to access Internet from an Android application?

Google removed the need to ask permission for the internet for the latest version. Still, to request for internet permission in your code you must add these to your AndroidManifest.xml file.

<uses-permission android:name="android.permission.INTERNET"/>

How to capture a backspace on the onkeydown event

In your function check for the keycode 8 (backspace) or 46 (delete)

Keycode information
Keycode list

batch to copy files with xcopy

After testing most of the switches this worked for me:

xcopy C:\folder1 C:\folder2\folder1 /t /e /i /y

This will copy the folder folder1 into the folder folder2. So the directory tree would look like:


How to execute a command in a remote computer?

Another solution is to use WMI.NET or Windows Management Instrumentation.

Using the .NET Framework namespace System.Management, you can automate administrative tasks using Windows Management Instrumentation (WMI).

Code Sample

using System.Management;
var processToRun = new[] { "notepad.exe" };
var connection = new ConnectionOptions();
connection.Username = "username";
connection.Password = "password";
var wmiScope = new ManagementScope(String.Format("\\\\{0}\\root\\cimv2", REMOTE_COMPUTER_NAME), connection);
var wmiProcess = new ManagementClass(wmiScope, new ManagementPath("Win32_Process"), new ObjectGetOptions());
wmiProcess.InvokeMethod("Create", processToRun);

If you have trouble with authentication, then check the DCOM configuration.

  1. On the target machine, run dcomcnfg from the command prompt.
  2. Expand Component Services\Computers\My Computer\DCOM Config
  3. Find Windows Management Instruction, identified with GUID 8BC3F05E-D86B-11D0-A075-00C04FB68820 (you can see this in the details view).
  4. Edit the properties and then add the username you are trying to login with under the permissions tab.
  5. You may need to reboot the service or the entire machine.

NOTE: All paths used for the remote process need to be local to the target machine.

Loop over array dimension in plpgsql

Since PostgreSQL 9.1 there is the convenient FOREACH:

   m   varchar[];
   arr varchar[] := array[['key1','val1'],['key2','val2']];
      RAISE NOTICE 'another_func(%,%)',m[1], m[2];

Solution for older versions:

   arr varchar[] := '{{key1,val1},{key2,val2}}';
   FOR i IN array_lower(arr, 1) .. array_upper(arr, 1)
      RAISE NOTICE 'another_func(%,%)',arr[i][1], arr[i][2];

Also, there is no difference between varchar[] and varchar[][] for the PostgreSQL type system. I explain in more detail here.

The DO statement requires at least PostgreSQL 9.0, and LANGUAGE plpgsql is the default (so you can omit the declaration).

How to run python script on terminal (ubuntu)?

Sorry, Im a newbie myself and I had this issue:

./ line 1: syntax error near unexpected token "Hello World"' ./ line 1:print("Hello World")'

I added the file header for the python 'deal' as #!/usr/bin/python

Then simple executed the program with './'

How can I get the MAC and the IP address of a connected client in PHP?

For windows server I think u can use this:

echo exec('getmac');

How to link an image and target a new window

<a href="" target="_blank">
  <img width="220" height="250" border="0" align="center"  src=""/>

How can I add items to an empty set in python

>>> d = {}
>>> D = set()
>>> type(d)
<type 'dict'>
>>> type(D)
<type 'set'>

What you've made is a dictionary and not a Set.

The update method in dictionary is used to update the new dictionary from a previous one, like so,

>>> abc = {1: 2}
>>> d.update(abc)
>>> d
{1: 2}

Whereas in sets, it is used to add elements to the set.

>>> D.update([1, 2])
>>> D
set([1, 2])

How to append new data onto a new line

I presume that all you are wanting is simple string concatenation:

def storescores():

   hs = open("hst.txt","a")
   hs.write(name + " ")

Alternatively, change the " " to "\n" for a newline.

How to avoid 'undefined index' errors?

Figure out what keys are in the $output array, and fill the missing ones in with empty strings.

$keys = array_keys($output);
$desired_keys = array('author', 'new_icon', 'admin_link', 'etc.');

foreach($desired_keys as $desired_key){
   if(in_array($desired_key, $keys)) continue;  // already set
   $output[$desired_key] = '';

How to get a product's image in Magento?

You can try to replace $this-> by Mage:: in some cases. You need to convert to string.

In my case i'm using DirectResize extension (direct link), so my code is like this:

(string)Mage::helper('catalog/image')->init($_product, 'image')->directResize(150,150,3)

The ratio options (3rd param) are :

  • none proportional. The image will be resized at the Width and Height values.
  • proportional, based on the Width value 2
  • proportional, based on the Height value 3
  • proportional for the new image can fit in the Width and the Height values. 4
  • proportional. The new image will cover an area with the Width and the Height values.

Update: other info and versions here

The common way, without plugin would be:

(string)Mage::helper('catalog/image')->init($_product, 'image')->resize(150)

You can replace 'image' with 'small_image' or 'thumbnail'.

Autowiring fails: Not an managed Type

You should extend the scope of the component-scan e.g. <context:component-scan base-package="at.naviclean" /> since you placed the entities in package at.naviclean.domain;

This should help you to get rid the exeption: Not an managed type: class at.naviclean.domain.Kassa

For further debugging you could try to dump the application context (see javadoc) to explore which classes have been detected by the component-scan if some are still no recognized check their annotation (@Service, @Component etc.)


You also need to add the classes to your persistence.xml


PHP output showing little black diamonds with a question mark

what I ended up doing in the end after I fixed my tables was to back it up and change back the settings to utf-8 then I altered my dump file so that DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci are my character set entries

now I don't have characterset issues anymore because the database and browser are utf8.

I figured out what caused it. It was the web page+browser effects on the DB. On the terminals that are linux (ubuntu+firefox) it was encoding the database in latin1 which is what the tabes are set. But on the windows 10+edge terminals, the entries were force coded into utf8. Also I noticed the windows 10 has issues staying with latin1 so I decided to bend with the wind and convert all to utf8.

I figured it was a windows 10 issue because we started using win 10 terminals. so yet again microsoft bugs causes issues. I still don't know why the encoding changes on the forms because the browser in windows 10 shows the latin1 characterset but when it goes in its utf8 encoded and I get the data anomaly. but in linux+firefox it doesn't do that.

Remove blue border from css custom-styled button in Chrome

Simply write outline:none;. No need to use pseudo element focus

How to use a variable of one method in another method?

You can't. Variables defined inside a method are local to that method.

If you want to share variables between methods, then you'll need to specify them as member variables of the class. Alternatively, you can pass them from one method to another as arguments (this isn't always applicable).

Looks like you're using instance methods instead of static ones.

If you don't want to create an object, you should declare all your methods static, so something like

private static void methodName(Argument args...)

If you want a variable to be accessible by all these methods, you should initialise it outside the methods and to limit its scope, declare it private.

private static int[][] array = new int[3][5];

Global variables are usually looked down upon (especially for situations like your one) because in a large-scale program they can wreak havoc, so making it private will prevent some problems at the least.

Also, I'll say the usual: You should try to keep your code a bit tidy. Use descriptive class, method and variable names and keep your code neat (with proper indentation, linebreaks etc.) and consistent.

Here's a final (shortened) example of what your code should be like:

public class Test3 {
    //Use this array in your methods
    private static int[][] scores = new int[3][5];

    /* Rather than just "Scores" name it so people know what
     * to expect
    private static void createScores() {
    //Other methods...

    /* Since you're now using static methods, you don't 
     * have to initialise an object and call its methods.
    public static void main(String[] args){
        MD();   //Don't know what these do
        sumD(); //so I'll leave them.

Ideally, since you're using an array, you would create the array in the main method and pass it as an argument across each method, but explaining how that works is probably a whole new question on its own so I'll leave it at that.

Differences between TCP sockets and web sockets, one more time

WebSocket is basically an application protocol (with reference to the ISO/OSI network stack), message-oriented, which makes use of TCP as transport layer.

The idea behind the WebSocket protocol consists of reusing the established TCP connection between a Client and Server. After the HTTP handshake the Client and Server start speaking WebSocket protocol by exchanging WebSocket envelopes. HTTP handshaking is used to overcome any barrier (e.g. firewalls) between a Client and a Server offering some services (usually port 80 is accessible from anywhere, by anyone). Client and Server can switch over speaking HTTP in any moment, making use of the same TCP connection (which is never released).

Behind the scenes WebSocket rebuilds the TCP frames in consistent envelopes/messages. The full-duplex channel is used by the Server to push updates towards the Client in an asynchronous way: the channel is open and the Client can call any futures/callbacks/promises to manage any asynchronous WebSocket received message.

To put it simply, WebSocket is a high level protocol (like HTTP itself) built on TCP (reliable transport layer, on per frame basis) that makes possible to build effective real-time application with JS Clients (previously Comet and long-polling techniques were used to pull updates from the Server before WebSockets were implemented. See Stackoverflow post: Differences between websockets and long polling for turn based game server ).

MS Access - execute a saved query by name in VBA

You can do it the following way:

DoCmd.OpenQuery "yourQueryName", acViewNormal, acEdit



PHP Foreach Arrays and objects


//$arr should be array as you mentioned as below
foreach($arr as $key=>$value){
  echo $value->sm_id;


//$arr should be array as you mentioned as below
foreach($arr as $value){
  echo $value->sm_id;

Converting a String to a List of Words?

list=mystr.split(" ",mystr.count(" "))

What values can I pass to the event attribute of the f:ajax tag?

The event attribute of <f:ajax> can hold at least all supported DOM events of the HTML element which is been generated by the JSF component in question. An easy way to find them all out is to check all on* attribues of the JSF input component of interest in the JSF tag library documentation and then remove the "on" prefix. For example, the <h:inputText> component which renders <input type="text"> lists the following on* attributes (of which I've already removed the "on" prefix so that it ultimately becomes the DOM event type name):

  • blur
  • change
  • click
  • dblclick
  • focus
  • keydown
  • keypress
  • keyup
  • mousedown
  • mousemove
  • mouseout
  • mouseover
  • mouseup
  • select

Additionally, JSF has two more special event names for EditableValueHolder and ActionSource components, the real HTML DOM event being rendered depends on the component type:

  • valueChange (will render as change on text/select inputs and as click on radio/checkbox inputs)
  • action (will render as click on command links/buttons)

The above two are the default events for the components in question.

Some JSF component libraries have additional customized event names which are generally more specialized kinds of valueChange or action events, such as PrimeFaces <p:ajax> which supports among others tabChange, itemSelect, itemUnselect, dateSelect, page, sort, filter, close, etc depending on the parent <p:xxx> component. You can find them all in the "Ajax Behavior Events" subsection of each component's chapter in PrimeFaces Users Guide.

Android : Capturing HTTP Requests with non-rooted android device

You could install Charles - an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet - on your PC or MAC.

Config steps:

  • Let your phone and PC or MAC in a same LAN
  • Launch Charles which you installed (default proxy port is 8888)
  • Setup your phone's wifi configuration: set the ip of delegate to your PC or MAC's ip, port of delegate to 8888
  • Lauch your app in your phone. And monitor http requests on Charles.

MVC razor form with multiple different submit buttons?

This is what worked for me.


Snippet :

 <input type="submit" formaction="@Url.Action("Edit")" formmethod="post" value="Save" class="btn btn-primary" />

<input type="submit" formaction="@Url.Action("PartialEdit")" formmethod="post" value="Select Type" class="btn btn-primary" />

        public ActionResult Edit( Quote quote)
        public ActionResult PartialEdit(Quote quote)

Might help some one who wants to have 2 different action methods instead of one method using selectors or using client scripts .

Recursively find files with a specific extension

As an alternative to using -regex option on find, since the question is labeled , you can use the brace expansion mechanism:

eval find . -false "-o -name Robert".{jpg,pdf}

Send data from javascript to a mysql database

The other posters are correct you cannot connect to MySQL directly from javascript. This is because JavaScript is at client side & mysql is server side.

So your best bet is to use ajax to call a handler as quoted above if you can let us know what language your project is in we can better help you ie php/java/.net

If you project is using php then the example from Merlyn is a good place to start, I would personally use jquery.ajax() to cut down you code and have a better chance of less cross browser issues.

Connect to external server by using phpMyAdmin

at version 4.0 or above, we need to create one '' or rename the '' to '';

In my case, I also work with one mysql server for each environment (dev and production):

/* others code*/  
$whoIam = gethostname();
switch($whoIam) {
    case 'devHost':
        $cfg['Servers'][$i]['host'] = 'localhost';
    case 'MasterServer':
        $cfg['Servers'][$i]['host'] = 'masterMysqlServer';
} /* others code*/ 

How can I get a list of all values in select box?

As per the DOM structure you can use below code:

var x = document.getElementById('mySelect');
     var txt = "";
     var val = "";
     for (var i = 0; i < x.length; i++) {
         txt +=x[i].text + ",";
         val +=x[i].value + ",";

Get the list of stored procedures created and / or modified on a particular date?

Here is the "newer school" version.

and CREATED = '20120927'

Character Limit in HTML

For the <input> element there's the maxlength attribute:

<input type="text" id="Textbox" name="Textbox" maxlength="10" />

(by the way, the type is "text", not "textbox" as others are writing), however, you have to use javascript with <textarea>s. Either way the length should be checked on the server anyway.

not finding android sdk (Unity)

1- Just open

2- scroll down to the bottom of that page

3- download last version of tools for your OS (for example

4- Unzip it

5- Delete folder tools from previous Android Sdk folder

6- Copy new folder tools to Android SDK Folder like this image:

enter image description here

rejected master -> master (non-fast-forward)

git push -f origin master

use brute force ;-) Most likely you are trying to add a local folder that you created before creating the repo on git.

Best ways to teach a beginner to program?

I don't know for sure what will be the best for your brother, but I know I started with python. I've been playing various games from a very early age and wanted to make my own, so my uncle introduced me to python with the pygame library. It has many tutorials and makes it all easy (WAY easier than openGL in my opinion). It is limited to 2d, but you should be starting out simple anyway.

My uncle recommended python because he was interested in it at the time, but I recommend it, now fairly knowledgeable, because it's easy to learn, intuitive (or as intuitive as a programming language can get), and simple (but certainly not simplistic).

I personally found basic programming simply to learn programming obscenely boring at the time, but picked up considerable enthusiasm as I went. I really wanted to be learning in order to build something, not just to learn it.

How to parse XML in Bash?

While it seems like "never parse XML, JSON... from bash without a proper tool" is sound advice, I disagree. If this is side job, it is waistfull to look for the proper tool, then learn it... Awk can do it in minutes. My programs have to work on all above mentioned and more kinds of data. Hell, I do not want to test 30 tools to parse 5-7-10 different formats I need if I can awk the problem in minutes. I do not care about XML, JSON or whatever! I need a single solution for all of them.

As an example: my SmartHome program runs our homes. While doing it, it reads plethora of data in too many different formats I can not control. I never use dedicated, proper tools since I do not want to spend more than minutes on reading the data I need. With FS and RS adjustments, this awk solution works perfectly for any textual format. But, it may not be the proper answer when your primary task is to work primarily with loads of data in that format!

The problem of parsing XML from bash I faced yesterday. Here is how I do it for any hierarchical data format. As a bonus - I assign data directly to the variables in a bash script.

To make thins easier to read, I will present solution in stages. From the OP test data, I created a file: test.xml

Parsing said XML in bash and extracting the data in 90 chars:

awk 'BEGIN { FS="<|>"; RS="\n" }; /host|username|password|dbname/ { print $2, $4 }' test.xml

I normally use more readable version since it is easier to modify in real life as I often need to test differently:

awk 'BEGIN { FS="<|>"; RS="\n" }; { if ($0 ~ /host|username|password|dbname/) print $2,$4}' test.xml

I do not care how is the format called. I seek only the simplest solution. In this particular case, I can see from the data that newline is the record separator (RS) and <> delimit fields (FS). In my original case, I had complicated indexing of 6 values within two records, relating them, find when the data exists plus fields (records) may or may not exist. It took 4 lines of awk to solve the problem perfectly. So, adapt idea to each need before using it!

Second part simply looks it there is wanted string in a line (RS) and if so, prints out needed fields (FS). The above took me about 30 seconds to copy and adapt from the last command I used this way (4 times longer). And that is it! Done in 90 chars.

But, I always need to get the data neatly into variables in my script. I first test the constructs like so:

awk 'BEGIN { FS="<|>"; RS="\n" }; { if ($0 ~ /host|username|password|dbname/) print $2"=\""$4"\"" }' test.xml

In some cases I use printf instead of print. When I see everything looks well, I simply finish assigning values to variables. I know many think "eval" is "evil", no need to comment :) Trick works perfectly on all four of my networks for years. But keep learning if you do not understand why this may be bad practice! Including bash variable assignments and ample spacing, my solution needs 120 chars to do everything.

eval $( awk 'BEGIN { FS="<|>"; RS="\n" }; { if ($0 ~ /host|username|password|dbname/) print $2"=\""$4"\"" }' test.xml ); echo "host: $host, username: $username, password: $password dbname: $dbname"

ApiNotActivatedMapError for simple html page using google-places-api

Have you tried following the advice on the linked help page? The help page at says:


The Google Maps JavaScript API is not activated on your API project. You may need to enable the Google Maps JavaScript API under APIs in the Google Developers Console.

See Obtaining an API key.

So check that the key you are using has Google Maps JavaScript API enabled.

Good way to encapsulate Integer.parseInt()

What about forking the parseInt method?

It's easy, just copy-paste the contents to a new utility that returns Integer or Optional<Integer> and replace throws with returns. It seems there are no exceptions in the underlying code, but better check.

By skipping the whole exception handling stuff, you can save some time on invalid inputs. And the method is there since JDK 1.0, so it is not likely you will have to do much to keep it up-to-date.

C# find highest array value and index

If you know max index accessing the max value is immediate. So all you need is max index.

int max=0;

for(int i = 1; i < arr.Length; i++)
    if (arr[i] > arr[max]) max = i;

Axios get in url works but with second parameter as object it doesn't

On client:

  axios.get('/api', {
      params: {
        foo: 'bar'

On server:

function get(req, res, next) {

  let param =

WebView link click open default browser

You only need to add the following line

yourWebViewName.setWebViewClient(new WebViewClient());

Check this for official documentation.

How do I add a tool tip to a span element?

the "title" attribute will be used as the text for tooltip by the browser, if you want to apply style to it consider using some plugins

Making custom right-click context menus for my web-app

<!DOCTYPE html>_x000D_
    <title>Right Click</title>_x000D_
    <link href="" rel="stylesheet" type="text/css" />_x000D_
    <script src=""></script>_x000D_
    <script src="" type="text/javascript"></script>_x000D_
    <script src="" type="text/javascript"></script>_x000D_
    <span class="context-menu-one" style="border:solid 1px black; padding:5px;">Right Click Me</span>_x000D_
    <script type="text/javascript">_x000D_
        $(function() {_x000D_
            selector: '.context-menu-one', _x000D_
            callback: function(key, options) {_x000D_
                var m = "clicked: " + key;_x000D_
                window.console && console.log(m) || alert(m); _x000D_
            items: {_x000D_
                "edit": {name: "Edit", icon: "edit"},_x000D_
                "cut": {name: "Cut", icon: "cut"},_x000D_
               copy: {name: "Copy", icon: "copy"},_x000D_
                "paste": {name: "Paste", icon: "paste"},_x000D_
                "delete": {name: "Delete", icon: "delete"},_x000D_
                "sep1": "---------",_x000D_
                "quit": {name: "Quit", icon: function(){_x000D_
                    return 'context-menu-icon context-menu-icon-quit';_x000D_
        $('.context-menu-one').on('click', function(e){_x000D_
            console.log('clicked', this);_x000D_
        })    _x000D_

Is there a way to use SVG as content in a pseudo element :before or :after

.myDiv {
  display: flex;
  align-items: center;

.myDiv:before {
  display: inline-block;
  content: url(./dog.svg);
  margin-right: 15px;
  width: 10px;

How can I override Bootstrap CSS styles?

To reset the styles defined for legend in bootstrap, you can do following in your css file:

legend {
  all: unset;


The all property in CSS resets all of the selected element's properties, except the direction and unicode-bidi properties that control text direction.

Possible values are: initial, inherit & unset.

Side note: clear property is used in relation with float (

Array Index Out of Bounds Exception (Java)

import java.util.Scanner;
class ar1 {
    public static void main(String[] args) {
        //Scanner sc=new Scanner(;
        int[] a={10,20,30,40,12,32};
        int bi=0,sm=0;
        for(int i=0;i<=a.length-1;i++) {


What is the difference between tree depth and height?

Simple Answer:
1. Tree: Number of edges/arc from the root node to the leaf node of the tree is called as the Depth of the Tree.
2. Node: Number of edges/arc from the root node to that node is called as the Depth of that node.

Java: convert seconds to minutes, hours and days

An example using built in TimeUnit.

long uptime = System.currentTimeMillis();

long days = TimeUnit.MILLISECONDS
uptime -= TimeUnit.DAYS.toMillis(days);

long hours = TimeUnit.MILLISECONDS
uptime -= TimeUnit.HOURS.toMillis(hours);

long minutes = TimeUnit.MILLISECONDS
uptime -= TimeUnit.MINUTES.toMillis(minutes);

long seconds = TimeUnit.MILLISECONDS

How to increase the gap between text and underlining in CSS

What I use:

<span style="border-bottom: 1px solid black"> Enter text here </span>

Using Bootstrap Tooltip with AngularJS

Simple Answer - using UI Bootstrap (ui.bootstrap.tooltip)

There seem to be a bunch of very complex answers to this question. Here's what worked for me.

  1. Install UI Bootstrap - $ bower install angular-bootstrap

  2. Inject UI Bootstrap as a dependency - angular.module('myModule', ['ui.bootstrap']);

  3. Use the uib-tooltip directive in your html.

<button class="btn btn-default"
        uib-tooltip="I'm a tooltip!">
     I'm a button!

What's the best free C++ profiler for Windows?

Proffy is quite cool:

Disclaimer: I wrote this.

Number of occurrences of a character in a string

You could do this:

int count = test.Split('&').Length - 1;

Or with LINQ:

test.Count(x => x == '&');

java.math.BigInteger cannot be cast to java.lang.Integer

java.lang.Integer is not a super class of BigInteger. Both BigInteger and Integer do inherit from java.lang.Number, so you could cast to a java.lang.Number.

See the java docs

Font size relative to the user's screen resolution?

Not sure why is this complicated. I would do this basic javascript

<body onresize='document.getElementsByTagName("body")[0].style[ "font-size" ] = document.body.clientWidth*(12/1280) + "px";'>

Where 12 means 12px at 1280 resolution. You decide the value you want here

How do I send a POST request as a JSON?

This one works fine for me with apis

import requests

data={'Id':id ,'name': name}
r = url = 'https://apiurllink', data = data)

trim left characters in sql server?

use "LEFT"

 select left('Hello World', 5)

or use "SUBSTRING"

 select substring('Hello World', 1, 5)

Setting button text via javascript

Set the text of the button by setting the innerHTML

var b = document.createElement('button');
b.setAttribute('content', 'test content');
b.setAttribute('class', 'btn');
b.innerHTML = 'test value';

var wrapper = document.getElementById('divWrapper');

Github permission denied: ssh add agent has no identities

I had this issue after restoring a hard drive from a backup.

My problem: I could check & see my remote (using git remote -v), but when I executed git push origin master, it returned : Permission denied (publickey). fatal: Could not read from remote repository.

I already had an SSH folder and SSH keys, and adding them via Terminal (ssh-add /path/to/my-ssh-folder/id_rsa) successfully added my identity, but I still couldn't push and still got the same error. Generating a new key was a bad idea for me, because it was tied to other very secure permissions on AWS.

It turned out the link between the key and my Github profile had broken.

Solution: Re-adding the key to Github in Profile > Settings > SSH and GPG keys resolved the issue.

Also: My account had 2-factor authentication set up. When this is the case, if Terminal requests credentials, use your username - but NOT your Github password. For 2-factor authentication, you need to use your authentication code (for me, this was generated by Authy on my phone, and I had to copy it into Terminal for the pw).

jQuery - prevent default, then continue default

"Validation injection without submit looping":

I just want to check reCaptcha and some other stuff before HTML5 validation, so I did something like that (the validation function returns true or false):

   var application_form = $('form#application-form');


           return true;



SVG drop shadow using css3

I'm not aware of a CSS-only solution.

As you mentioned, filters are the canonical approach to creating drop shadow effects in SVG. The SVG specification includes an example of this.

How do I connect to a SQL Server 2008 database using JDBC?

There are mainly two ways to use JDBC - using Windows authentication and SQL authentication. SQL authentication is probably the easiest. What you can do is something like:

String userName = "username";
String password = "password";

String url = "jdbc:sqlserver://MYPC\\SQLEXPRESS;databaseName=MYDB";

Connection conn = DriverManager.getConnection(url, userName, password);

after adding sqljdbc4.jar to the build path.

For Window authentication you can do something like:

String url = "jdbc:sqlserver://MYPC\\SQLEXPRESS;databaseName=MYDB;integratedSecurity=true";
Connection conn = DriverManager.getConnection(url);

and then add the path to sqljdbc_auth.dll as a VM argument (still need sqljdbc4.jar in the build path).

Please take a look here for a short step-by-step guide showing how to connect to SQL Server from Java using jTDS and JDBC should you need more details. Hope it helps!

Calculating Covariance with Python and Numpy

Thanks to unutbu for the explanation. By default numpy.cov calculates the sample covariance. To obtain the population covariance you can specify normalisation by the total N samples like this:

Covariance = numpy.cov(a, b, bias=True)[0][1]

or like this:

Covariance = numpy.cov(a, b, ddof=0)[0][1]

How to initialize a struct in accordance with C programming language standards

void function(void) {
  MY_TYPE a;
  a.flag = true;
  a.value = 15;
  a.stuff = 0.123;

What's the canonical way to check for type in Python?

Here is an example why duck typing is evil without knowing when it is dangerous. For instance: Here is the Python code (possibly omitting proper indenting), note that this situation is avoidable by taking care of isinstance and issubclassof functions to make sure that when you really need a duck, you don't get a bomb.

class Bomb:
    def __init__(self):

    def talk(self):

    def explode(self):
        print "BOOM!, The bomb explodes."

class Duck:
    def __init__(self):
    def talk(self):
        print "I am a duck, I will not blow up if you ask me to talk."    

class Kid:
    kids_duck = None

    def __init__(self):
        print "Kid comes around a corner and asks you for money so he could buy a duck."

    def takeDuck(self, duck):
        self.kids_duck = duck
        print "The kid accepts the duck, and happily skips along"

    def doYourThing(self):
        print "The kid tries to get the duck to talk"

myKid = Kid()
myBomb = Bomb()

How do I import material design library to Android Studio?

If you migrated to AndroidX you should add the dependency in graddle like this:

How to combine GROUP BY, ORDER BY and HAVING

ORDER BY is always last...

However, you need to pick the fields you ACTUALLY WANT then select only those and group by them. SELECT * and GROUP BY Email will give you RANDOM VALUES for all the fields but Email. Most RDBMS will not even allow you to do this because of the issues it creates, but MySQL is the exception.

FROM user_log

Round to 2 decimal places

double formattedNumber = Double.parseDouble(new DecimalFormat("#.##").format(unformattedNumber));

worked for me :)

A top-like utility for monitoring CUDA activity on a GPU

Another useful monitoring approach is to use ps filtered on processes that consume your GPUs. I use this one a lot:

ps f -o user,pgrp,pid,pcpu,pmem,start,time,command -p `lsof -n -w -t /dev/nvidia*`

That'll show all nvidia GPU-utilizing processes and some stats about them. lsof ... retrieves a list of all processes using an nvidia GPU owned by the current user, and ps -p ... shows ps results for those processes. ps f shows nice formatting for child/parent process relationships / hierarchies, and -o specifies a custom formatting. That one is similar to just doing ps u but adds the process group ID and removes some other fields.

One advantage of this over nvidia-smi is that it'll show process forks as well as main processes that use the GPU.

One disadvantage, though, is it's limited to processes owned by the user that executes the command. To open it up to all processes owned by any user, I add a sudo before the lsof.

Lastly, I combine it with watch to get a continuous update. So, in the end, it looks like:

watch -n 0.1 'ps f -o user,pgrp,pid,pcpu,pmem,start,time,command -p `sudo lsof -n -w -t /dev/nvidia*`'

Which has output like:

Every 0.1s: ps f -o user,pgrp,pid,pcpu,pmem,start,time,command -p `sudo lsof -n -w -t /dev/nvi...  Mon Jun  6 14:03:20 2016
grisait+ 27294 50934  0.0  0.1   Jun 02 00:01:40 /opt/google/chrome/chrome --type=gpu-process --channel=50877.0.2015482623
grisait+ 27294 50941  0.0  0.0   Jun 02 00:00:00  \_ /opt/google/chrome/chrome --type=gpu-broker
grisait+ 53596 53596 36.6  1.1 13:47:06 00:05:57 python -u
grisait+ 53596 33428  6.9  0.5 14:02:09 00:00:04  \_ python -u
grisait+ 53596 33773  7.5  0.5 14:02:19 00:00:04  \_ python -u
grisait+ 53596 34174  5.0  0.5 14:02:30 00:00:02  \_ python -u
grisait+ 28205 28205  905  1.5 13:30:39 04:56:09 python -u
grisait+ 28205 28387  5.8  0.4 13:30:49 00:01:53  \_ python -u
grisait+ 28205 28388  5.3  0.4 13:30:49 00:01:45  \_ python -u
grisait+ 28205 28389  4.5  0.4 13:30:49 00:01:29  \_ python -u
grisait+ 28205 28390  4.5  0.4 13:30:49 00:01:28  \_ python -u
grisait+ 28205 28391  4.8  0.4 13:30:49 00:01:34  \_ python -u

How to select the last record from MySQL table using SQL syntax

FROM table_name

How do you use $sce.trustAsHtml(string) to replicate ng-bind-html-unsafe in Angular 1.2+

Personally I sanitize all my data with some PHP libraries before going into the database so there's no need for another XSS filter for me.

From AngularJS 1.0.8

directives.directive('ngBindHtmlUnsafe', [function() {
    return function(scope, element, attr) {
        element.addClass('ng-binding').data('$binding', attr.ngBindHtmlUnsafe);
        scope.$watch(attr.ngBindHtmlUnsafe, function ngBindHtmlUnsafeWatchAction(value) {
            element.html(value || '');

To use:

<div ng-bind-html-unsafe="group.description"></div>

To disable $sce:

app.config(['$sceProvider', function($sceProvider) {

Calling the base class constructor from the derived class constructor

The constructor of PetStore will call a constructor of Farm; there's no way you can prevent it. If you do nothing (as you've done), it will call the default constructor (Farm()); if you need to pass arguments, you'll have to specify the base class in the initializer list:

    : Farm( neededArgument )
    , idF( 0 )

(Similarly, the constructor of PetStore will call the constructor of nameF. The constructor of a class always calls the constructors of all of its base classes and all of its members.)

INSERT ... ON DUPLICATE KEY (do nothing)

Negative : because the UPDATE uses resources for the second action.

Negative : MySQL will not show any errors if something goes wrong, so you cannot handle the errors. Use it only if you don’t care about the query.

What are differences between AssemblyVersion, AssemblyFileVersion and AssemblyInformationalVersion?

AssemblyInformationalVersion and AssemblyFileVersion are displayed when you view the "Version" information on a file through Windows Explorer by viewing the file properties. These attributes actually get compiled in to a VERSION_INFO resource that is created by the compiler.

AssemblyInformationalVersion is the "Product version" value. AssemblyFileVersion is the "File version" value.

The AssemblyVersion is specific to .NET assemblies and is used by the .NET assembly loader to know which version of an assembly to load/bind at runtime.

Out of these, the only one that is absolutely required by .NET is the AssemblyVersion attribute. Unfortunately it can also cause the most problems when it changes indiscriminately, especially if you are strong naming your assemblies.

How to make a view with rounded corners?

public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {

        Bitmap roundedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap
                .getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(roundedBitmap);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);
        final float roundPx = pixels;

        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return roundedBitmap;

rsync error: failed to set times on "/foo/bar": Operation not permitted

The problem in my case was that the "receiver mountpoint" was incorrectly mounted. It was in read-only mode (for some extrange reason). It looked like rsync was copying the files, but it was not. I checked my fstab file and changed mount options to default, re-mount file system and execute rsync again. All fine then.

Convert to Datetime MM/dd/yyyy HH:mm:ss in Sql Server


select convert(varchar(10),GETDATE(), 103) + 
       ' '+
       right(convert(varchar(32),GETDATE(),108),8) AS Date_Time

It will Produce:

Date_Time 30/03/2015 11:51:40

Setting an int to Infinity in C++

int min and max values

Int -2,147,483,648 / 2,147,483,647 Int 64 -9,223,372,036,854,775,808 / 9,223,372,036,854,775,807

i guess you could set a to equal 9,223,372,036,854,775,807 but it would need to be an int64

if you always want a to be grater that b why do you need to check it? just set it to be true always

How to stop (and restart) the Rails Server?

Press Ctrl+C

When you start the server it mentions this in the startup text.

Disable form autofill in Chrome without disabling autocomplete

A bit late to the party... but this is easily done with some jQuery:

$(window).on('load', function() {
    $('input:-webkit-autofill').each(function() {


  • Removes autofill text and background color.
  • Retains autocomplete on field.
  • Keeps any events/data bound to the input element.


  • Quick flash of autofilled field on page load.

Force flex item to span full row width

When you want a flex item to occupy an entire row, set it to width: 100% or flex-basis: 100%, and enable wrap on the container.

The item now consumes all available space. Siblings are forced on to other rows.

.parent {
  display: flex;
  flex-wrap: wrap;

#range, #text {
  flex: 1;

.error {
  flex: 0 0 100%; /* flex-grow, flex-shrink, flex-basis */
  border: 1px dashed black;
<div class="parent">
  <input type="range" id="range">
  <input type="text" id="text">
  <label class="error">Error message (takes full width)</label>

More info: The initial value of the flex-wrap property is nowrap, which means that all items will line up in a row. MDN

Angular 2 - View not updating after model changes

It might be that the code in your service somehow breaks out of Angular's zone. This breaks change detection. This should work:

import {Component, OnInit, NgZone} from 'angular2/core';

export class RecentDetectionComponent implements OnInit {

    recentDetections: Array<RecentDetection>;

    constructor(private zone:NgZone, // <== added
        private recentDetectionService: RecentDetectionService) {
        this.recentDetections = new Array<RecentDetection>();

    getRecentDetections(): void {
            .subscribe(recent => { 
        => { // <== added
                     this.recentDetections = recent;

    ngOnInit() {
        let timer = Observable.timer(2000, 5000);
        timer.subscribe(() => this.getRecentDetections());

For other ways to invoke change detection see Triggering change detection manually in Angular

Alternative ways to invoke change detection are


to immediately run change detection for the current component and its children


to include the current component the next time Angular runs change detection


to run change detection for the whole application

Why can't I display a pound (£) symbol in HTML?

Educated guess: You have a ISO-8859-1 encoded pound sign in a UTF-8 encoded page.

Make sure your data is in the right encoding and everything will work fine.

Update multiple rows with different values in a single SQL query

Use a comma ","

UPDATE my_table SET rowOneValue = rowOneValue + 1, rowTwoValue  = rowTwoValue + ( (rowTwoValue / (rowTwoValue) ) + ?) * (v + 1) WHERE value = ?

What was the strangest coding standard rule that you were forced to follow?

Once I had to do a little DLL out of my team and when it was done I had to redo the job because I shouldn't have had used "else" in the code. When I asked why I was instructed not to ask why, but the leader of the other team just "didn't get the else stuff".

Pause Console in C++ program

If you want to write portable C++ code, then I'd suggest using cin.get().

system("PAUSE") works on Windows, since it requires the execution of a console command named "PAUSE". But I'm not sure that other operating systems like Linux or other Unix derivatives support that. So that tends to be non-portable.

Since C++ already offers cin.get(), I see no compelling reason to use C getch().

How to clamp an integer to some range?

Chaining max() and min() together is the normal idiom I've seen. If you find it hard to read, write a helper function to encapsulate the operation:

def clamp(minimum, x, maximum):
    return max(minimum, min(x, maximum))

How do I convert a String object into a Hash object?

The string created by calling Hash#inspect can be turned back into a hash by calling eval on it. However, this requires the same to be true of all of the objects in the hash.

If I start with the hash {:a =>}, then its string representation is "{:a=>#<Object:0x7f66b65cf4d0>}", and I can't use eval to turn it back into a hash because #<Object:0x7f66b65cf4d0> isn't valid Ruby syntax.

However, if all that's in the hash is strings, symbols, numbers, and arrays, it should work, because those have string representations that are valid Ruby syntax.

104, 'Connection reset by peer' socket error, or When does closing a socket result in a RST rather than FIN?

I've had this problem. See The Python "Connection Reset By Peer" Problem.

You have (most likely) run afoul of small timing issues based on the Python Global Interpreter Lock.

You can (sometimes) correct this with a time.sleep(0.01) placed strategically.

"Where?" you ask. Beats me. The idea is to provide some better thread concurrency in and around the client requests. Try putting it just before you make the request so that the GIL is reset and the Python interpreter can clear out any pending threads.

UITableView Separator line

Simplest way to add a separator line under each tableview cell can be done in the storyboard itself. First select the tableview, then in the attribute inspector select the separator line property to be single line. After this, select the separator inset to be custom and update the left inset to be 0 from the left.


Looping through array and removing items, without breaking for loop

Although your question is about deleting elements from the array being iterated upon and not about removing elements (in addition to some other processing) efficiently, I think one should reconsider it if in similar situation.

The algorithmic complexity of this approach is O(n^2) as splice function and the for loop both iterate over the array (splice function shifts all elements of array in the worst case). Instead you can just push the required elements to the new array and then just assign that array to the desired variable (which was just iterated upon).

var newArray = [];
for (var i = 0, len = Auction.auctions.length; i < len; i++) {
    auction = Auction.auctions[i];
    if (!auction.seconds < 0) { 
Auction.auctions = newArray;

Since ES2015 we can use Array.prototype.filter to fit it all in one line:

Auction.auctions = Auction.auctions.filter(auction => --auction.seconds >= 0);

Skip first line(field) in loop using CSV file? Return the next row of the reader’s iterable object as a list, parsed according to the current dialect.

How do I get first element rather than using [0] in jQuery?

You can try like this:

Sort ArrayList of custom Objects by property

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;

public class test {

public static class Person {
    public String name;
    public int id;
    public Date hireDate;

    public Person(String iname, int iid, Date ihireDate) {
        name = iname;
        id = iid;
        hireDate = ihireDate;

    public String toString() {
        return name + " " + id + " " + hireDate.toString();

    // Comparator
    public static class CompId implements Comparator<Person> {
        public int compare(Person arg0, Person arg1) {
            return -;

    public static class CompDate implements Comparator<Person> {
        private int mod = 1;
        public CompDate(boolean desc) {
            if (desc) mod =-1;
        public int compare(Person arg0, Person arg1) {
            return mod*arg0.hireDate.compareTo(arg1.hireDate);

public static void main(String[] args) {
    // TODO Auto-generated method stub
    SimpleDateFormat df = new SimpleDateFormat("mm-dd-yyyy");
    ArrayList<Person> people;
    people = new ArrayList<Person>();
    try {
        people.add(new Person("Joe", 92422, df.parse("12-12-2010")));
        people.add(new Person("Joef", 24122, df.parse("1-12-2010")));
        people.add(new Person("Joee", 24922, df.parse("12-2-2010")));
    } catch (ParseException e) {
        // TODO Auto-generated catch block

    Collections.sort(people, new Person.CompId());
    System.out.println("BY ID");
    for (Person p : people) {

    Collections.sort(people, new Person.CompDate(false));
    System.out.println("BY Date asc");
    for (Person p : people) {
    Collections.sort(people, new Person.CompDate(true));
    System.out.println("BY Date desc");
    for (Person p : people) {



Check whether a value is a number in JavaScript or jQuery

there is a function called isNaN it return true if it's (Not-a-number) , so u can check for a number this way

   //do some thing if it's a number
   //do some thing if it's NOT a number

hope it works

What is the difference between a definition and a declaration?

Definition :

extern int a;      // Declaration 
int a;             // Definition
a = 10             // Initialization
int b = 10;        // Definition & Initialization

Definition associates the variable with a type and allocates memory, whereas declaration just specifies the type but doesn't allocate memory. Declaration is more useful when you want to refer the variable before definition.

*Don't confuse definition with initialization. Both are different, initialization gives value to the variable. See the above example.

Following are some examples of definition.

int a;
float b;
double c;

Now function declaration :

int fun(int a,int b); 

Note the semicolon at the end of function so it says it is only a declaration. Compiler knows that somewhere in the program that function will be defined with that prototype. Now if the compiler gets a function call something like this

int b=fun(x,y,z);

Compiler will throw an error saying that there is no such function. Because it doesn't has any prototype for that function.

Note the difference between two programs.

Program 1

#include <stdio.h>
void print(int a)

In this, print function is declared and defined as well. Since function call is coming after the definition. Now see the next program.

Program 2

 #include <stdio.h>
 void print(int a); // In this case this is essential
 void print(int a)

It is essential because function call precedes definition so compiler must know whether there is any such function. So we declare the function which will inform the compiler.

Definition :

This part of defining a function is called Definition. It says what to do inside the function.

void print(int a)

How does DHT in torrents work?

The general theory can be found in wikipedia's article on Kademlia. The specific protocol specification used in bittorrent is here:

Apply a function to every row of a matrix or a data frame

You simply use the apply() function:

R> M <- matrix(1:6, nrow=3, byrow=TRUE)
R> M
     [,1] [,2]
[1,]    1    2
[2,]    3    4
[3,]    5    6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1]  4 10 16

This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().

Status bar and navigation bar appear over my view's bounds in iOS 7

You don't have to calculate how far to shift everything down, there's a build in property for this. In Interface Builder, highlight your view controller, and then navigate to the attributes inspector. Here you'll see some check boxes next to the words "Extend Edges". As you can see, in the first screenshot, the default selection is for content to appear under top and bottom bars, but not under opaque bars, which is why setting the bar style to not translucent worked for you.

As you can somewhat see in the first screenshot, there are two UI elements hiding below the navigation bar. (I've enabled wireframes in IB to illustrate this) These elements, a UIButton and a UISegmentedControl both have their "y" origin set to zero, and the view controller is set to allow content below the top bar.

enter image description here

This second screenshot shows what happens when you deselect the "Under Top Bars" check box. As you can see, the view controllers view has been shifted down appropriately for its y origin to be right underneath the navigation bar.

enter image description here

This can also be accomplished programmatically through the usage of -[UIViewController edgesForExtendedLayout]. Here's a link to the class reference for edgeForExtendedLayout, and for UIRectEdge

[self setEdgesForExtendedLayout:UIRectEdgeNone];

Checking from shell script if a directory contains files

Taking a hint (or several) from olibre's answer, I like a Bash function:

function isEmptyDir {
  [ -d $1 -a -n "$( find $1 -prune -empty 2>/dev/null )" ]

Because while it creates one subshell, it's as close to an O(1) solution as I can imagine and giving it a name makes it readable. I can then write

if isEmptyDir somedir
  echo somedir is an empty directory
  echo somedir does not exist, is not a dir, is unreadable, or is  not empty

As for O(1) there are outlier cases: if a large directory has had all or all but the last entry deleted, "find" may have to read the whole thing to determine whether it's empty. I believe that expected performance is O(1) but worst-case is linear in the directory size. I have not measured this.

How to validate an OAuth 2.0 access token for a resource server?

OAuth 2.0 spec doesn't define the part. But there could be couple of options:

  1. When resource server gets the token in the Authz Header then it calls the validate/introspect API on Authz server to validate the token. Here Authz server might validate it either from using DB Store or verifying the signature and certain attributes. As part of response, it decodes the token and sends the actual data of token along with remaining expiry time.

  2. Authz Server can encrpt/sign the token using private key and then publickey/cert can be given to Resource Server. When resource server gets the token, it either decrypts/verifies signature to verify the token. Takes the content out and processes the token. It then can either provide access or reject.

Redirect output of mongo query to a csv file

Extending other answers:

I found @GEverding's answer most flexible. It also works with aggregation:



    { $match: {} }
]).forEach(function(user) {

Execute the following command to export results:

mongo test_db < ./test_db.js >> ./test_db.csv

Unfortunately, it adds additional text to the CSV file which requires processing the file before we can use it:

MongoDB shell version: 3.2.10 
connecting to: test_db

But we can make mongo shell stop spitting out those comments and only print what we have asked for by passing the --quiet flag

mongo --quiet test_db < ./test_db.js >> ./test_db.csv

Converting a string to an integer on Android

Use regular expression:

int i=Integer.parseInt("hello123".replaceAll("[\\D]",""));
int j=Integer.parseInt("123hello".replaceAll("[\\D]",""));
int k=Integer.parseInt("1h2el3lo".replaceAll("[\\D]",""));