Programs & Examples On #Xlib

Xlib is a library used to communicate with X11 servers. This is the library that widget toolkits like GTK+, Qt, and Motif use to draw their graphics, and it's considered to be low-level.

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesWithDexForDebug'

Migrate to androidX library

With Android Studio 3.2 and higher, you can migrate an existing project to AndroidX by selecting Refactor > Migrate to AndroidX from the menu bar.

Source: https://developer.android.com/jetpack/androidx/migrate

NGINX - No input file specified. - php Fast/CGI

You must add "include fastcgi.conf" in

location ~ \.$php{
  #......
  include fastcgi.conf;
}

Xlib: extension "RANDR" missing on display ":21". - Trying to run headless Google Chrome

It seems that when this error appears it is an indication that the selenium-java plugin for maven is out-of-date.

Changing the version in the pom.xml should fix the problem

Check if a string is html or not

There is an NPM package is-html that can attempt to solve this https://github.com/sindresorhus/is-html

Webdriver Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms

I got the same error; I've used selenium-java version 2.25.0 and Firefox vresion 18.0.2; I've changed the version of selenium-java to 2.30.0 and now works.

X11/Xlib.h not found in Ubuntu

Andrew White's answer is sufficient to get you moving. Here's a step-by-step for beginners.

A simple get started:

Create test.cpp: (This will be built and run to verify you got things set up right.)

#include <X11/Xlib.h>
#include <unistd.h>


main()
{
  // Open a display.
  Display *d = XOpenDisplay(0);

  if ( d )
    {
      // Create the window
      Window w = XCreateWindow(d, DefaultRootWindow(d), 0, 0, 200,
                   100, 0, CopyFromParent, CopyFromParent,
                   CopyFromParent, 0, 0);

      // Show the window
      XMapWindow(d, w);
      XFlush(d);

      // Sleep long enough to see the window.
      sleep(10);
    }
  return 0;
}

(Source: LinuxGazette)

Try: g++ test.cpp -lX11 If it builds to a.out, try running it. If you see a simple window drawn, you have the necessary libraries, and some other root problem is afoot.

If your response is:

    test.cpp:1:22: fatal error: X11/Xlib.h: No such file or directory
    compilation terminated.

you need to install X11 development libraries. sudo apt-get install libx11-dev

Retry g++ test.cpp -lX11

If it works, you're golden.

Tested using a fresh install of libX11-dev_2%3a1.5.0-1_i386.deb

Best way to use Google's hosted jQuery, but fall back to my hosted library on Google fail

Almost all public CDNs are pretty reliably. However, if you are worried about blocked google domain, then you can simply fallback to an alternative jQuery CDN. However, in such a case, you may prefer to do it opposite way and use some other CDN as your preferred option and fallback to Google CDN to avoid failed requests and waiting time:

<script src="https://pagecdn.io/lib/jquery/3.2.1/jquery.min.js"></script>
<script>
   window.jQuery || document.write('<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"><\/script>');
</script>

How to check if X server is running?

1)

# netstat -lp|grep -i x
tcp        0      0 *:x11                   *:*                     LISTEN      2937/X          
tcp6       0      0 [::]:x11                [::]:*                  LISTEN      2937/X          
Active UNIX domain sockets (only servers)
unix  2      [ ACC ]     STREAM     LISTENING     8940     2937/X              @/tmp/.X11-unix/X0
unix  2      [ ACC ]     STREAM     LISTENING     8941     2937/X              /tmp/.X11-unix/X0
#

2) nmap

# nmap localhost|grep -i x
6000/tcp open  X11
#

Regular Expression to match valid dates

This is not an appropriate use of regular expressions. You'd be better off using

[0-9]{2}/[0-9]{2}/[0-9]{4}

and then checking ranges in a higher-level language.

Find (and kill) process locking port 3000 on Mac

One of the ways to kill a process on a port is to use the python library: freeport (https://pypi.python.org/pypi/freeport/0.1.9) . Once installed, simply:

# install freeport
pip install freeport

# Once freeport is installed, use it as follows
$ freeport 3000
Port 3000 is free. Process 16130 killed successfully

Can't drop table: A foreign key constraint fails

I realize this is stale for a while and an answer had been selected, but how about the alternative to allow the foreign key to be NULL and then choose ON DELETE SET NULL.

Basically, your table should be changed like so:

ALTER TABLE 'bericht' DROP FOREIGN KEY 'your_foreign_key';

ALTER TABLE 'bericht' ADD CONSTRAINT 'your_foreign_key' FOREIGN KEY ('column_foreign_key') REFERENCES 'other_table' ('column_parent_key') ON UPDATE CASCADE ON DELETE SET NULL;

Personally I would recommend using both "ON UPDATE CASCADE" as well as "ON DELETE SET NULL" to avoid unnecessary complications, however your set up may dictate a different approach.

Hope this helps.

How to delete last character from a string using jQuery?

@skajfes and @GolezTrol provided the best methods to use. Personally, I prefer using "slice()". It's less code, and you don't have to know how long a string is. Just use:

//-----------------------------------------
// @param begin  Required. The index where 
//               to begin the extraction. 
//               1st character is at index 0
//
// @param end    Optional. Where to end the
//               extraction. If omitted, 
//               slice() selects all 
//               characters from the begin 
//               position to the end of 
//               the string.
var str = '123-4';
alert(str.slice(0, -1));

How to create XML file with specific structure in Java

Use JAXB: http://www.mkyong.com/java/jaxb-hello-world-example/

package com.mkyong.core;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Customer {

    String name;
    int age;
    int id;

    public String getName() {
        return name;
    }

    @XmlElement
    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    @XmlElement
    public void setAge(int age) {
        this.age = age;
    }

    public int getId() {
        return id;
    }

    @XmlAttribute
    public void setId(int id) {
        this.id = id;
    }

}
package com.mkyong.core;

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

public class JAXBExample {
    public static void main(String[] args) {

      Customer customer = new Customer();
      customer.setId(100);
      customer.setName("mkyong");
      customer.setAge(29);

      try {

        File file = new File("C:\\file.xml");
        JAXBContext jaxbContext = JAXBContext.newInstance(Customer.class);
        Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

        // output pretty printed
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

        jaxbMarshaller.marshal(customer, file);
        jaxbMarshaller.marshal(customer, System.out);

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

    }
}

How do I filter an array with AngularJS and use a property of the filtered object as the ng-model attribute?

Here is a modified JSBin with a working sample:

http://jsbin.com/sezamuja/1/edit

Here is what I did with filters in the input:

<input ng-model="(results.subjects | filter:{grade:'C'})[0].title">

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');
wrapper.appendChild(b);

http://jsfiddle.net/jUVpE/

What is an API key?

An API key is a unique value that is assigned to a user of this service when he's accepted as a user of the service.

The service maintains all the issued keys and checks them at each request.

By looking at the supplied key at the request, a service checks whether it is a valid key to decide on whether to grant access to a user or not.

How do I negate a condition in PowerShell?

You almost had it with Not. It should be:

if (-Not (Test-Path C:\Code)) {
    write "it doesn't exist!"
} 

You can also use !: if (!(Test-Path C:\Code)){}

Just for fun, you could also use bitwise exclusive or, though it's not the most readable/understandable method.

if ((test-path C:\code) -bxor 1) {write "it doesn't exist!"}

shift a std_logic_vector of n bit to right or left

Personally, I think the concatenation is the better solution. The generic implementation would be

entity shifter is
    generic (
        REGSIZE  : integer := 8);
    port(
        clk      : in  str_logic;
        Data_in  : in  std_logic;
        Data_out : out std_logic(REGSIZE-1 downto 0);
end shifter ;

architecture bhv of shifter is
    signal shift_reg : std_logic_vector(REGSIZE-1 downto 0) := (others<='0');
begin
    process (clk) begin
        if rising_edge(clk) then
            shift_reg <= shift_reg(REGSIZE-2 downto 0) & Data_in;
        end if;
    end process;
end bhv;
Data_out <= shift_reg;

Both will implement as shift registers. If you find yourself in need of more shift registers than you are willing to spend resources on (EG dividing 1000 numbers by 4) you might consider using a BRAM to store the values and a single shift register to contain "indices" that result in the correct shift of all the numbers.

How do I check for null values in JavaScript?

To check for null SPECIFICALLY you would use this:

if (variable === null)

This test will ONLY pass for null and will not pass for "", undefined, false, 0, or NaN.

Additionally, I've provided absolute checks for each "false-like" value (one that would return true for !variable).

Note, for some of the absolute checks, you will need to implement use of the absolutely equals: === and typeof.

I've created a JSFiddle here to show all of the individual tests working

Here is the output of each check:

Null Test:

if (variable === null)

- variable = ""; (false) typeof variable = string

- variable = null; (true) typeof variable = object

- variable = undefined; (false) typeof variable = undefined

- variable = false; (false) typeof variable = boolean

- variable = 0; (false) typeof variable = number

- variable = NaN; (false) typeof variable = number



Empty String Test:

if (variable === '')

- variable = ''; (true) typeof variable = string

- variable = null; (false) typeof variable = object

- variable = undefined; (false) typeof variable = undefined

- variable = false; (false) typeof variable = boolean

- variable = 0; (false) typeof variable = number

- variable = NaN; (false) typeof variable = number




Undefined Test:

if (typeof variable == "undefined")

-- or --

if (variable === undefined)

- variable = ''; (false) typeof variable = string

- variable = null; (false) typeof variable = object

- variable = undefined; (true) typeof variable = undefined

- variable = false; (false) typeof variable = boolean

- variable = 0; (false) typeof variable = number

- variable = NaN; (false) typeof variable = number



False Test:

if (variable === false)

- variable = ''; (false) typeof variable = string

- variable = null; (false) typeof variable = object

- variable = undefined; (false) typeof variable = undefined

- variable = false; (true) typeof variable = boolean

- variable = 0; (false) typeof variable = number

- variable = NaN; (false) typeof variable = number



Zero Test:

if (variable === 0)

- variable = ''; (false) typeof variable = string

- variable = null; (false) typeof variable = object

- variable = undefined; (false) typeof variable = undefined

- variable = false; (false) typeof variable = boolean

- variable = 0; (true) typeof variable = number

- variable = NaN; (false) typeof variable = number



NaN Test:

if (typeof variable == 'number' && !parseFloat(variable) && variable !== 0)

-- or --

if (isNaN(variable))

- variable = ''; (false) typeof variable = string

- variable = null; (false) typeof variable = object

- variable = undefined; (false) typeof variable = undefined

- variable = false; (false) typeof variable = boolean

- variable = 0; (false) typeof variable = number

- variable = NaN; (true) typeof variable = number

As you can see, it's a little more difficult to test against NaN;

Comparing strings in C# with OR in an if statement

try

if (testString.Equals(testString2)){
}

How do I use CMake?

Regarding CMake 3.13.3, platform Windows, and IDE Visual Studio 2017, I suggest this guide. In brief I suggest:
1. Download cmake > unzip it > execute it.
2. As example download GLFW > unzip it > create inside folder Build.
3. In cmake Browse "Source" > Browse "Build" > Configure and Generate.
4. In Visual Studio 2017 Build your Solution.
5. Get the binaries.
Regards.

INSERT INTO ... SELECT FROM ... ON DUPLICATE KEY UPDATE

Although I am very late to this but after seeing some legitimate questions for those who wanted to use INSERT-SELECT query with GROUP BY clause, I came up with the work around for this.

Taking further the answer of Marcus Adams and accounting GROUP BY in it, this is how I would solve the problem by using Subqueries in the FROM Clause

INSERT INTO lee(exp_id, created_by, location, animal, starttime, endtime, entct, 
                inact, inadur, inadist, 
                smlct, smldur, smldist, 
                larct, lardur, lardist, 
                emptyct, emptydur)
SELECT sb.id, uid, sb.location, sb.animal, sb.starttime, sb.endtime, sb.entct, 
       sb.inact, sb.inadur, sb.inadist, 
       sb.smlct, sb.smldur, sb.smldist, 
       sb.larct, sb.lardur, sb.lardist, 
       sb.emptyct, sb.emptydur
FROM
(SELECT id, uid, location, animal, starttime, endtime, entct, 
       inact, inadur, inadist, 
       smlct, smldur, smldist, 
       larct, lardur, lardist, 
       emptyct, emptydur 
FROM tmp WHERE uid=x
GROUP BY location) as sb
ON DUPLICATE KEY UPDATE entct=sb.entct, inact=sb.inact, ...

Vertical line using XML drawable

You can use a shape but instead of a line make it rectangle.

android:shape="rectangle">
<stroke
    android:width="5dp"
    android:color="#ff000000"
    android:dashGap="10px"
    android:dashWidth="30px" />

and In your layout use this...

<ImageView
    android:layout_width="7dp"
    android:layout_height="match_parent"
    android:src="@drawable/dashline"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layerType="software"/>

You might have to play with the width, depending on the size of the dashes, to get it into a single line.

Hope this helps Cheers

Update multiple columns in SQL

update T1
set T1.COST2=T1.TOT_COST+2.000,
T1.COST3=T1.TOT_COST+2.000,
T1.COST4=T1.TOT_COST+2.000,
T1.COST5=T1.TOT_COST+2.000,
T1.COST6=T1.TOT_COST+2.000,
T1.COST7=T1.TOT_COST+2.000,
T1.COST8=T1.TOT_COST+2.000,
T1.COST9=T1.TOT_COST+2.000,
T1.COST10=T1.TOT_COST+2.000,
T1.COST11=T1.TOT_COST+2.000,
T1.COST12=T1.TOT_COST+2.000,
T1.COST13=T1.TOT_COST+2.000
from DBRMAST T1 
inner join DBRMAST t2 on t2.CODE=T1.CODE

Using partial views in ASP.net MVC 4

You're passing the same model to the partial view as is being passed to the main view, and they are different types. The model is a DbSet of Notes, where you need to pass in a single Note.

You can do this by adding a parameter, which I'm guessing as it's the create form would be a new Note

@Html.Partial("_CreateNote", new QuickNotes.Models.Note())

How to wait for the 'end' of 'resize' event and only then perform an action?

ResizeStart and ResizeEnd events for window

http://jsfiddle.net/04fLy8t4/

I implemented function which trig two events on user DOM element:

  1. resizestart
  2. resizeend

Code:

var resizeEventsTrigger = (function () {
    function triggerResizeStart($el) {
        $el.trigger('resizestart');
        isStart = !isStart;
    }

    function triggerResizeEnd($el) {
        clearTimeout(timeoutId);
        timeoutId = setTimeout(function () {
            $el.trigger('resizeend');
            isStart = !isStart;
        }, delay);
    }

    var isStart = true;
    var delay = 200;
    var timeoutId;

    return function ($el) {
        isStart ? triggerResizeStart($el) : triggerResizeEnd($el);
    };

})();

$("#my").on('resizestart', function () {
    console.log('resize start');
});
$("#my").on('resizeend', function () {
    console.log('resize end');
});

window.onresize = function () {
    resizeEventsTrigger( $("#my") );
};

How to convert java.util.Date to java.sql.Date?

Converting java.util.Data to java.sql.Data will loose hour, minute and second. So if it is possible, I suggest you use java.sql.Timestamp like this:

prepareStatement.setTimestamp(1, new Timestamp(utilDate.getTime()));

For more info, you can check this question.

PHP CURL Enable Linux

if you have used curl above the page and below your html is present and unfortunately your html page is not able to view then just enable your curl. But in order to check CURL is enable or not in php you need to write following code:

echo 'Curl: ', function_exists('curl_version') ? 'Enabled' : 'Disabled';

How can I fill a div with an image while keeping it proportional?

All answers below have fixed width and height, which makes solution "not responsive".

To achieve the result but keep image responsive I used following:

  1. Inside container place a transparent gif image with desired proportion
  2. Give an image tag inline css background with image you want to resize and crop

HTML:

<div class="container">
    <img style="background-image: url("https://i.imgur.com/XOmNCwY.jpg");" src="img/blank.gif">
</div> 


.container img{
   width: 100%;
   height: auto;
   background-size: cover;
   background-repeat: no-repeat;
   background-position: center;
}?

How can I add a string to the end of each line in Vim?

Also:

:g/$/norm A*

Also:

gg<Ctrl-v>G$A*<Esc>

Preventing twitter bootstrap carousel from auto sliding on page load

I think maybe you should go to check the official instruction about carousel, for me, i have not found answer above, because of multiple versions of bootstrap, I'm using b4-alpha and i want the autoplay effect stop.

$(document).ready({
    pause:true,
    interval:false
});

this script does not make any effect while mouse leave that page, exactly carousel area. go to official definition and find those :

enter image description here

So you will find why.if carousel page onmouseover event triggered, page will pause, while mouse out of that page, it'll resume again.

So, if you want a page stop forever and rotate manually, you can just set data-interval='false'.

How to install Android SDK Build Tools on the command line?

Try

1. List all packages

android list sdk --all

2. Install packages using following command

android update sdk -u -a -t package1, package2, package3 //comma seperated packages obtained using list command 

HTTP URL Address Encoding in Java

You can also use GUAVA and path escaper: UrlEscapers.urlFragmentEscaper().escape(relativePath)

Create new project on Android, Error: Studio Unknown host 'services.gradle.org'

I also faced it and encorrected it like below successfully.

File > Settings > Build, Execution, Deployment > Gradle > Use local gradle distribution

Set the home path as : C:/Program Files/Android/Android Studio/gradle/gradle-version

You may need to upgrade your gradle version.

What is the default root pasword for MySQL 5.7

As of Ubuntu 20.04 with MySql 8.0 : you can set the password that way:

  1. login to mysql with sudo mysql -u root

  2. change the password:

USE mysql;
UPDATE user set authentication_string=NULL where User='root';
FLUSH privileges;
ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'My-N7w_And.5ecure-P@s5w0rd';
FLUSH privileges;
QUIT

now you should be able to login with mysql -u root -p (or to phpMyAdmin with username root) and your chosen password.

P,S:

You can also login with user debian-sys-maint, the password is written in the file /etc/mysql/debian.cnf

Is std::vector copying the objects with a push_back?

From C++11 onwards, all the standard containers (std::vector, std::map, etc) support move semantics, meaning that you can now pass rvalues to standard containers and avoid a copy:

// Example object class.
class object
{
private:
    int             m_val1;
    std::string     m_val2;

public:
    // Constructor for object class.
    object(int val1, std::string &&val2) :
        m_val1(val1),
        m_val2(std::move(val2))
    {

    }
};

std::vector<object> myList;

// #1 Copy into the vector.
object foo1(1, "foo");
myList.push_back(foo1);

// #2 Move into the vector (no copy).
object foo2(1024, "bar");
myList.push_back(std::move(foo2));

// #3 Move temporary into vector (no copy).
myList.push_back(object(453, "baz"));

// #4 Create instance of object directly inside the vector (no copy, no move).
myList.emplace_back(453, "qux");

Alternatively you can use various smart pointers to get mostly the same effect:

std::unique_ptr example

std::vector<std::unique_ptr<object>> myPtrList;

// #5a unique_ptr can only ever be moved.
auto pFoo = std::make_unique<object>(1, "foo");
myPtrList.push_back(std::move(pFoo));

// #5b unique_ptr can only ever be moved.
myPtrList.push_back(std::make_unique<object>(1, "foo"));

std::shared_ptr example

std::vector<std::shared_ptr<object>> objectPtrList2;

// #6 shared_ptr can be used to retain a copy of the pointer and update both the vector
// value and the local copy simultaneously.
auto pFooShared = std::make_shared<object>(1, "foo");
objectPtrList2.push_back(pFooShared);
// Pointer to object stored in the vector, but pFooShared is still valid.

What is the difference between class and instance methods?

class methods

are methods which are declared as static. The method can be called without creating an instance of the class. Class methods can only operate on class members and not on instance members as class methods are unaware of instance members. Instance methods of the class can also not be called from within a class method unless they are being called on an instance of that class.

Instance methods

on the other hand require an instance of the class to exist before they can be called, so an instance of a class needs to be created by using the new keyword. Instance methods operate on specific instances of classes. Instance methods are not declared as static.

$("#form1").validate is not a function

Probably the browser first downloaded the validade script and then jQuery. If the validade script be downloaded before loading jQuery you'll get an error. You can see this using a tool like firebug.

Try this:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script>
    function LoadValidade() {
        var a = false;
        try {
            var teste = $('*');
            if(teste == null)
                throw 1;
        } catch (e) { 
            a = true; 
        }

        if (a){ 
            setTimeout(LoadValidade, 300);
            return;
        }

        var validadeScript = document.createElement("script");
        validadeScript.src = "../common/jquery.validate.js";
        $('head')[0].appendChild(validadeScript);
    } 
    setTimeout(LoadValidade, 300);
</script>

C# refresh DataGridView when updating or inserted on another form

DataGridView.Refresh and And DataGridView.Update are methods that are inherited from Control. They have to do with redrawing the control which is why new rows don't appear.

My guess is the data retrieval is on the Form_Load. If you want your Button on Form B to retrieve the latest data from the database then that's what you have to do whatever Form_Load is doing.

A nice way to do that is to separate your data retrieval calls into a separate function and call it from both the From Load and Button Click events.

MySQL CONCAT returns NULL if any field contain NULL

Use CONCAT_WS instead:

CONCAT_WS() does not skip empty strings. However, it does skip any NULL values after the separator argument.

SELECT CONCAT_WS('-',`affiliate_name`,`model`,`ip`,`os_type`,`os_version`) AS device_name FROM devices

Find the most frequent number in a NumPy array

I like the solution by JoshAdel.

But there is just one catch.

The np.bincount() solution only works on numbers.

If you have strings, collections.Counter solution will work for you.

Creating .pem file for APNS?

You can have a look here. I have the detailed process described with images, right from creating the certificate, to app key to provisioning profile, to eventually the pem. http://docs.moengage.com/docs/apns-certificate-pem-file

Displaying a webcam feed using OpenCV and Python

If you only have one camera, or you don't care which camera is the correct one, then use "-1" as the index. Ie for your example capture = cv.CaptureFromCAM(-1).

Why extend the Android Application class?

Sometimes you want to store data, like global variables which need to be accessed from multiple Activities - sometimes everywhere within the application. In this case, the Application object will help you.

For example, if you want to get the basic authentication data for each http request, you can implement the methods for authentication data in the application object.

After this,you can get the username and password in any of the activities like this:

MyApplication mApplication = (MyApplication)getApplicationContext();
String username = mApplication.getUsername();
String password = mApplication.getPassword();

And finally, do remember to use the Application object as a singleton object:

 public class MyApplication extends Application {
    private static MyApplication singleton;

    public MyApplication getInstance(){
        return singleton;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        singleton = this;
    }
}

For more information, please Click Application Class

Change Timezone in Lumen or Laravel 5

You can set your app time zone by configuring app.php file in config folder .

To change time zone , modify the value of timezone in app.php file.

This is written in this section

|--------------------------------------------------------------------------
| Application Timezone
|--------------------------------------------------------------------------
|
| Here you may specify the default timezone for your application, which
| will be used by the PHP date and date-time functions. We have gone
| ahead and set this to a sensible default for you out of the box.
|

For me i am using Asia/Dhaka as my application time zone.

Here is the appropriate syntax :

'timezone' => 'Asia/Dhaka'

list of timezones for PHP 5

Java Constructor Inheritance

Because constructors are an implementation detail - they're not something that a user of an interface/superclass can actually invoke at all. By the time they get an instance, it's already been constructed; and vice-versa, at the time you construct an object there's by definition no variable it's currently assigned to.

Think about what it would mean to force all subclasses to have an inherited constructor. I argue it's clearer to pass the variables in directly than for the class to "magically" have a constructor with a certain number of arguments just because it's parent does.

Thymeleaf: how to use conditionals to dynamically add/remove a CSS class

Just to add my own opinion, in case it might be useful to someone. This is what I used.

<div th:class="${request.read ? 'mdl-color-text--grey-800 w500' : ''}"> </div>

The identity used to sign the executable is no longer valid

Removed the profiles from the directory on your machine: "~/Library/MobileDevice/Provisioning Profiles". And logged to apple developer centre and edited the specific provisioning profile and selected the certificate for provisioning profile and generated the profile again. Installed the new profile and it worked for me.

best way to get the key of a key/value javascript object

I don't see anything else than for (var key in foo).

Apache HttpClient 4.0.3 - how do I set cookie with sessionID for POST request?

I did it by passing the cookie through the HttpContext:

HttpContext localContext = new BasicHttpContext();

localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);

response = client.execute(httppost, localContext);

Content Security Policy "data" not working for base64 Images in Chrome 28

Try this

data to load:

<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'><path fill='#343a40' d='M2 0L0 2h4zm0 5L0 3h4z'/></svg>

get a utf8 to base64 convertor and convert the "svg" string to:

PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHZpZXdCb3g9JzAgMCA0IDUn
PjxwYXRoIGZpbGw9JyMzNDNhNDAnIGQ9J00yIDBMMCAyaDR6bTAgNUwwIDNoNHonLz48L3N2Zz4=

and the CSP is

img-src data: image/svg+xml;base64,PHN2ZyB4bWxucz0naHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmcnIHZpZXdCb3g9JzAgMCA0IDUn
PjxwYXRoIGZpbGw9JyMzNDNhNDAnIGQ9J00yIDBMMCAyaDR6bTAgNUwwIDNoNHonLz48L3N2Zz4=

How can I display just a portion of an image in HTML/CSS?

One way to do it is to set the image you want to display as a background in a container (td, div, span etc) and then adjust background-position to get the sprite you want.

How to improve performance of ngRepeat over a huge dataset (angular.js)?

Another version @Steffomio

Instead of adding each item individually we can add items by chunks.

// chunks function from here: 
// http://stackoverflow.com/questions/8495687/split-array-into-chunks#11764168
var chunks = chunk(folders, 100);

//immediate display of our first set of items
$scope.items = chunks[0];

var delay = 100;
angular.forEach(chunks, function(value, index) {
    delay += 100;

    // skip the first chuck
    if( index > 0 ) {
        $timeout(function() {
            Array.prototype.push.apply($scope.items,value);
        }, delay);
    }       
});

How to cin Space in c++?

I have the same problem and I just used cin.getline(input,300);.

noskipws and cin.get() sometimes are not easy to use. Since you have the right size of your array try using cin.getline() which does not care about any character and read the whole line in specified character count.

jump to line X in nano editor

In the nano editor

Ctrl+_

On openning a file

nano +10 file.txt

concatenate variables

If you need to concatenate paths with quotes, you can use = to replace quotes in a variable. This does not require you to know if the path already contains quotes or not. If there are no quotes, nothing is changed.

@echo off
rem Paths to combine
set DIRECTORY="C:\Directory with spaces"
set FILENAME="sub directory\filename.txt"

rem Combine two paths
set COMBINED="%DIRECTORY:"=%\%FILENAME:"=%"
echo %COMBINED%

rem This is just to illustrate how the = operator works
set DIR_WITHOUT_SPACES=%DIRECTORY:"=%
echo %DIR_WITHOUT_SPACES%

How to read text files with ANSI encoding and non-English letters?

If I remember correctly the XmlDocument.Load(string) method always assumes UTF-8, regardless of the XML encoding. You would have to create a StreamReader with the correct encoding and use that as the parameter.

xmlDoc.Load(new StreamReader(
                     File.Open("file.xml"), 
                     Encoding.GetEncoding("iso-8859-15"))); 

I just stumbled across KB308061 from Microsoft. There's an interesting passage: Specify the encoding declaration in the XML declaration section of the XML document. For example, the following declaration indicates that the document is in UTF-16 Unicode encoding format:

<?xml version="1.0" encoding="UTF-16"?>

Note that this declaration only specifies the encoding format of an XML document and does not modify or control the actual encoding format of the data.

Link Source:

XmlDocument.Load() method fails to decode € (euro)

Error:Failed to open zip file. Gradle's dependency cache may be corrupt

****Following solution is working for me**** Manually deleted all files from C:\Users\Admin.gradle\wrapper\dists\

where Admin is my user name

Get UTC time in seconds

I bet this is what was intended as a result.

$ date -u --date=@1404372514
Thu Jul  3 07:28:34 UTC 2014

Can't find the 'libpq-fe.h header when trying to install pg gem

Ubuntu 20.04.1 LTS, this seemed to work for me:

sudo apt-get install ruby ruby-dev libpqxx-dev libpq-fe-dev libpq-dev 
sudo gem install pg -- --with-pg-config=/usr/include/postgresql/pg_config --with-pg-include=/usr/include/postgresql/

How do I properly set the permgen size?

You have to change the values in the CATALINA_OPTS option defined in the Tomcat Catalina start file. To increase the PermGen memory change the value of the MaxPermSize variable, otherwise change the value of the Xmx variable.

Linux & Mac OS: Open or create setenv.sh file placed in the "bin" directory. You have to apply the changes to this line:

export CATALINA_OPTS="$CATALINA_OPTS -server -Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m"

Windows:

Open or create the setenv.bat file placed in the "bin" directory:

set CATALINA_OPTS=-server -Xms256m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m

How to unmount, unrender or remove a component, from itself in a React/Redux/Typescript notification message

I've been to this post about 10 times now and I just wanted to leave my two cents here. You can just unmount it conditionally.

if (renderMyComponent) {
  <MyComponent props={...} />
}

All you have to do is remove it from the DOM in order to unmount it.

As long as renderMyComponent = true, the component will render. If you set renderMyComponent = false, it will unmount from the DOM.

Is there any way to wait for AJAX response and halt execution?

When using promises they can be used in a promise chain. async=false will be deprecated so using promises is your best option.

function functABC() {
  return new Promise(function(resolve, reject) {
    $.ajax({
      url: 'myPage.php',
      data: {id: id},
      success: function(data) {
        resolve(data) // Resolve promise and go to then()
      },
      error: function(err) {
        reject(err) // Reject the promise and go to catch()
      }
    });
  });
}

functABC().then(function(data) {
  // Run this when your request was successful
  console.log(data)
}).catch(function(err) {
  // Run this when promise was rejected via reject()
  console.log(err)
})

Can you "compile" PHP code and upload a binary-ish file, which will just be run by the byte code interpreter?

In php 7 there is the php ini option opcache.file_cache that saves the bytecode in a specific folder. In could be useful to in php cli script that are "compiled" and saved in a specific folder for a optimized reuse.

Opcache it is not compiling but is something similar.

Hyphen, underscore, or camelCase as word delimiter in URIs?

Whilst I recommend hyphens, I shall also postulate an answer that isn't on your list:

Nothing At All

  • My company's API has URIs like /quotationrequests/, /purchaseorders/ and so on.
  • Despite you saying it was an intranet app, you listed SEO as a benefit. Google does match the pattern /foobar/ in a URL for a query of ?q=foo+bar
  • I really hope you do not consider executing a PHP call to any arbitrary string the user passes in to the address bar, as @ServAce85 suggests!

For loop for HTMLCollection elements

you can add this two lines:

HTMLCollection.prototype.forEach = Array.prototype.forEach;
NodeList.prototype.forEach = Array.prototype.forEach;

HTMLCollection is return by getElementsByClassName and getElementsByTagName

NodeList is return by querySelectorAll

Like this you can do a forEach:

var selections = document.getElementsByClassName('myClass');

/* alternative :
var selections = document.querySelectorAll('.myClass');
*/

selections.forEach(function(element, i){
//do your stuffs
});

git cherry-pick says "...38c74d is a merge but no -m option was given"

@Borealid's answer is correct, but suppose that you don't care about preserving the exact merging history of a branch and just want to cherry-pick a linearized version of it. Here's an easy and safe way to do that:

Starting state: you are on branch X, and you want to cherry-pick the commits Y..Z.

  1. git checkout -b tempZ Z
  2. git rebase Y
  3. git checkout -b newX X
  4. git cherry-pick Y..tempZ
  5. (optional) git branch -D tempZ

What this does is to create a branch tempZ based on Z, but with the history from Y onward linearized, and then cherry-pick that onto a copy of X called newX. (It's safer to do this on a new branch rather than to mutate X.) Of course there might be conflicts in step 4, which you'll have to resolve in the usual way (cherry-pick works very much like rebase in that respect). Finally it deletes the temporary tempZ branch.

If step 2 gives the message "Current branch tempZ is up to date", then Y..Z was already linear, so just ignore that message and proceed with steps 3 onward.

Then review newX and see whether that did what you wanted.

(Note: this is not the same as a simple git rebase X when on branch Z, because it doesn't depend in any way on the relationship between X and Y; there may be commits between the common ancestor and Y that you didn't want.)

Java SSLException: hostname in certificate didn't match

In httpclient-4.3.3.jar, there is another HttpClient to use:

public static void main (String[] args) throws Exception {
    // org.apache.http.client.HttpClient client = new DefaultHttpClient();
    org.apache.http.client.HttpClient client = HttpClientBuilder.create().build();
    System.out.println("HttpClient = " + client.getClass().toString());
    org.apache.http.client.methods.HttpPost post = new HttpPost("https://www.rideforrainbows.org/");
    org.apache.http.HttpResponse response = client.execute(post);
    java.io.InputStream is = response.getEntity().getContent();
    java.io.BufferedReader rd = new java.io.BufferedReader(new java.io.InputStreamReader(is));
    String line;
    while ((line = rd.readLine()) != null) { 
        System.out.println(line);
    }
}

This HttpClientBuilder.create().build() will return org.apache.http.impl.client.InternalHttpClient. It can handle the this hostname in certificate didn't match issue.

WebRTC vs Websockets: If WebRTC can do Video, Audio, and Data, why do I need Websockets?

Webrtc is a part of peer to peer connection. We all know that before creating peer to peer connection, it requires handshaking process to establish peer to peer connection. And websockets play the role of handshaking process.

Full path from file input using jQuery

Well, getting full path is not possible but we can have a temporary path.

Try This:

It'll give you a temporary path not the accurate path, you can use this script if you want to show selected images as in this jsfiddle example(Try it by selectng images as well as other files):-

JSFIDDLE

Here is the code :-

HTML:-

<input type="file" id="i_file" value=""> 
<input type="button" id="i_submit" value="Submit">
    <br>
<img src="" width="200" style="display:none;" />
        <br>
<div id="disp_tmp_path"></div>

JS:-

$('#i_file').change( function(event) {
var tmppath = URL.createObjectURL(event.target.files[0]);
    $("img").fadeIn("fast").attr('src',URL.createObjectURL(event.target.files[0]));

    $("#disp_tmp_path").html("Temporary Path(Copy it and try pasting it in browser address bar) --> <strong>["+tmppath+"]</strong>");
});

Its not exactly what you were looking for, but may be it can help you somewhere.

java.io.IOException: Invalid Keystore format

Same issue here, I have Oracle JDK installed and my keystore was created using that, but in the jceks format

keytool -importkeystore -destkeystore client.keystore \
    -srckeystore redislabs_user.p12 -srcstoretype pkcs12 \
    -deststoretype jceks -alias client-cert

I deleted the -deststoretype jceks option and it worked fine :)

dyld: Library not loaded ... Reason: Image not found

if you use virtualenv just remove the folder of your environment and recreate it with this command virtualenv --python=/usr/local/bin/python3 the_name_of_my_env

JOptionPane Input to int

Please note that Integer.parseInt throws an NumberFormatException if the passed string doesn't contain a parsable string.

Select count(*) from multiple tables

JOIN with different tables

SELECT COUNT(*) FROM (  
SELECT DISTINCT table_a.ID  FROM table_a JOIN table_c ON table_a.ID  = table_c.ID   );

Gradle to execute Java class (without modifying build.gradle)

Expanding on First Zero's answer, I'm guess you want something where you can also run gradle build without errors.

Both gradle build and gradle -PmainClass=foo runApp work with this:

task runApp(type:JavaExec) {
    classpath = sourceSets.main.runtimeClasspath

    main = project.hasProperty("mainClass") ? project.getProperty("mainClass") : "package.MyDefaultMain"
}

where you set your default main class.

Adding css class through aspx code behind

If you want to add attributes, including the class, you need to set runat="server" on the tag.

    <div id="classMe" runat="server"></div>

Then in the code-behind:

classMe.Attributes.Add("class", "some-class")

Graphviz: How to go from .dot to a graph?

dot file.dot -Tpng -o image.png

This works on Windows and Linux. Graphviz must be installed.

Handling the null value from a resultset in JAVA

The String being null is a very good chance, but when you see values in your table, yet a null is printed by the ResultSet, it might mean that the connection was closed before the value of ResultSet was used.

Class.forName("org.sqlite.JDBC");
con = DriverManager.getConnection("jdbc:sqlite:My_db.db");
String sql = ("select * from cust where cust_id='" + cus + "'");
pst = con.prepareStatement(sql);
rs = pst.executeQuery();
con.close();
System.out.println(rs.getString(1));

Would print null even if there are values.

Class.forName("org.sqlite.JDBC");
con = DriverManager.getConnection("jdbc:sqlite:My_db.db");
String sql = ("select * from cust where cust_id='" + cus + "'");
pst = con.prepareStatement(sql);
rs = pst.executeQuery();
System.out.println(rs.getString(1));
con.close();

Wouldn't print null if there are values in the table.

Add class to <html> with Javascript?

You should append class not overwrite it

var headCSS = document.getElementsByTagName("html")[0].getAttribute("class") || "";
document.getElementsByTagName("html")[0].setAttribute("class",headCSS +"foo");

I would still recommend using jQuery to avoid browser incompatibilities

Disable the postback on an <ASP:LinkButton>

Something else you can do, if you want to preserve your scroll position is this:

<asp:LinkButton runat="server" id="someId" href="javascript: void;" Text="Click Me" />

PHP foreach with Nested Array?

As I understand , all of previous answers , does not make an Array output, In my case : I have a model with parent-children structure (simplified code here):

public function parent(){

    return $this->belongsTo('App\Models\Accounting\accounting_coding', 'parent_id');
}


public function children()
{

    return $this->hasMany('App\Models\Accounting\accounting_coding', 'parent_id');
}

and if you want to have all of children IDs as an Array , This approach is fine and working for me :

public function allChildren()
{
    $allChildren = [];
    if ($this->has_branch) {

        foreach ($this->children as $child) {

            $subChildren = $child->allChildren();

            if (count($subChildren) == 1) {
                $allChildren  [] = $subChildren[0];
            } else if (count($subChildren) > 1) {
                $allChildren += $subChildren;
            }
        }
    }
    $allChildren  [] = $this->id;//adds self Id to children Id list

    return $allChildren; 
}

the allChildren() returns , all of childrens as a simple Array .

Rails ActiveRecord date between

There should be a default active record behavior on this I reckon. Querying dates is hard, especially when timezones are involved.

Anyway, I use:

  scope :between, ->(start_date=nil, end_date=nil) {
    if start_date && end_date
      where("#{self.table_name}.created_at BETWEEN :start AND :end", start: start_date.beginning_of_day, end: end_date.end_of_day)
    elsif start_date
      where("#{self.table_name}.created_at >= ?", start_date.beginning_of_day)
    elsif end_date
      where("#{self.table_name}.created_at <= ?", end_date.end_of_day)
    else
      all
    end
  }

Multiple line comment in Python

#Single line

'''
multi-line
comment
'''

"""
also, 
multi-line comment
"""

How do I do a bulk insert in mySQL using node.js

If you want to insert object, use this:

    currentLogs = [
 { socket_id: 'Server', message: 'Socketio online', data: 'Port  3333', logged: '2014-05-14 14:41:11' },
 { socket_id: 'Server', message: 'Waiting for Pi to connect...', data: 'Port: 8082', logged: '2014-05-14 14:41:11' }
];

console.warn(currentLogs.map(logs=>[ logs.socket_id , logs.message , logs.data , logs.logged ]));

The output will be:

[
  [ 'Server', 'Socketio online', 'Port  3333', '2014-05-14 14:41:11' ],
  [
    'Server',
    'Waiting for Pi to connect...',
    'Port: 8082',
    '2014-05-14 14:41:11'
  ]
]

Also, please check the documentation to know more about the map function.

How to sort in-place using the merge sort algorithm?

Just for reference, here is a nice implementation of a stable in-place merge sort. Complicated, but not too bad.

I ended up implementing both a stable in-place merge sort and a stable in-place quicksort in Java. Please note the complexity is O(n (log n)^2)

How to use the new Material Design Icon themes: Outlined, Rounded, Two-Tone and Sharp?

For angular material you should use fontSet input to change the font family:

<link href="https://fonts.googleapis.com/css?family=Material+Icons|Material+Icons+Outlined|Material+Icons+Two+Tone|Material+Icons+Round|Material+Icons+Sharp"
rel="stylesheet" />

<mat-icon>edit</mat-icon>
<mat-icon fontSet="material-icons-outlined">edit</mat-icon>
<mat-icon fontSet="material-icons-two-tone">edit</mat-icon>
...

Using if elif fi in shell scripts

Use double brackets...

if [[ expression ]]

How to change the name of an iOS app?

For Xcode 11, if you want to change the App Display Name then simply go to plist and simply replace value of CFBundleDisplayName

<key>CFBundleDisplayName</key>
<string>Your App Name</string>

Can I use git diff on untracked files?

Assuming you do not have local commits,

git diff origin/master

XAMPP installation on Win 8.1 with UAC Warning

To disable UAC (as an administrator), from Control Panel:

Type UAC in the search button in your windows the upper right corner. Click the (Change User Account Control settings) in the search results. Drag the slider down and select Never notify and click OK.it will work.

Limiting the number of characters in a JTextField

Here is an optimized version of npinti's answer:

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;
import javax.swing.text.PlainDocument;
import java.awt.*;

public class TextComponentLimit extends PlainDocument
{
    private int charactersLimit;

    private TextComponentLimit(int charactersLimit)
    {
        this.charactersLimit = charactersLimit;
    }

    @Override
    public void insertString(int offset, String input, AttributeSet attributeSet) throws BadLocationException
    {
        if (isAllowed(input))
        {
            super.insertString(offset, input, attributeSet);
        } else
        {
            Toolkit.getDefaultToolkit().beep();
        }
    }

    private boolean isAllowed(String string)
    {
        return (getLength() + string.length()) <= charactersLimit;
    }

    public static void addTo(JTextComponent textComponent, int charactersLimit)
    {
        TextComponentLimit textFieldLimit = new TextComponentLimit(charactersLimit);
        textComponent.setDocument(textFieldLimit);
    }
}

To add a limit to your JTextComponent, simply write the following line of code:

JTextFieldLimit.addTo(myTextField, myMaximumLength);

What is so bad about singletons?

Paraphrased from Brian Button:

  1. They are generally used as a global instance, why is that so bad? Because you hide the dependencies of your application in your code, instead of exposing them through the interfaces. Making something global to avoid passing it around is a code smell.

  2. They violate the single responsibility principle: by virtue of the fact that they control their own creation and lifecycle.

  3. They inherently cause code to be tightly coupled. This makes faking them out under test rather difficult in many cases.

  4. They carry state around for the lifetime of the application. Another hit to testing since you can end up with a situation where tests need to be ordered which is a big no no for unit tests. Why? Because each unit test should be independent from the other.

Get all files and directories in specific path fast

I know this is old, but... Another option may be to use the FileSystemWatcher like so:

void SomeMethod()
{
    System.IO.FileSystemWatcher m_Watcher = new System.IO.FileSystemWatcher();
    m_Watcher.Path = path;
    m_Watcher.Filter = "*.*";
    m_Watcher.NotifyFilter = m_Watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
    m_Watcher.Created += new FileSystemEventHandler(OnChanged);
    m_Watcher.EnableRaisingEvents = true;
}

private void OnChanged(object sender, FileSystemEventArgs e)
    {
        string path = e.FullPath;

        lock (listLock)
        {
            pathsToUpload.Add(path);
        }
    }

This would allow you to watch the directories for file changes with an extremely lightweight process, that you could then use to store the names of the files that changed so that you could back them up at the appropriate time.

Count number of times value appears in particular column in MySQL

select email, count(*) as c FROM orders GROUP BY email

Test if executable exists in Python?

Use shutil.which() from Python's wonderful standard library. Batteries included!

do-while loop in R

Building on the other answers, I wanted to share an example of using the while loop construct to achieve a do-while behaviour. By using a simple boolean variable in the while condition (initialized to TRUE), and then checking our actual condition later in the if statement. One could also use a break keyword instead of the continue <- FALSE inside the if statement (probably more efficient).

  df <- data.frame(X=c(), R=c())  
  x <- x0
  continue <- TRUE

  while(continue)
  {
    xi <- (11 * x) %% 16
    df <- rbind(df, data.frame(X=x, R=xi))
    x <- xi

    if(xi == x0)
    {
      continue <- FALSE
    }
  }

How to programmatically set SelectedValue of Dropdownlist when it is bound to XmlDataSource

This seems to work for me.

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            DropDownList1.DataBind(); // get the data into the list you can set it
            DropDownList1.Items.FindByValue("SOMECREDITPROBLEMS").Selected = true;
        }
    }

JavaScript Form Submit - Confirm or Cancel Submission Dialog Box

You could use the JS confirm function.

<form onSubmit="if(!confirm('Is the form filled out correctly?')){return false;}">
  <input type="submit" />
</form>

http://jsfiddle.net/jasongennaro/DBHEz/

How to enable SOAP on CentOS

After hours of searching I think my problem was that command yum install php-soap installs the latest version of soap for the latest php version.

My php version was 7.027, but latest php version is 7.2 so I had to search for the right soap version and finaly found it HERE!

yum install rh-php70-php-soap

Now php -m | grep -i soap works, Output: soap

Do not forget to restart httpd service.

iOS for VirtualBox

VirtualBox is a virtualizer, not an emulator. (The name kinda gives it away.) I.e. it can only virtualize a CPU that is actually there, not emulate one that isn't. In particular, VirtualBox can only virtualize x86 and AMD64 CPUs. iOS only runs on ARM CPUs.

how to count length of the JSON array element

First if the object you're dealing with is a string then you need to parse it then figure out the length of the keys :

obj = JSON.parse(jsonString);
shareInfoLen = Object.keys(obj.shareInfo[0]).length;

Execute the setInterval function without delay the first time

actually the quickest is to do

interval = setInterval(myFunction(),45000)

this will call myfunction, and then will do it agaian every 45 seconds which is different than doing

interval = setInterval(myfunction, 45000)

which won't call it, but schedule it only

How do I create a MongoDB dump of my database?

Mongo dump and restore with uri to local

mongodump --uri "mongodb://USERNAME:PASSWORD@IP_OR_URL:PORT/DB_NAME" --collection COLLECTION_NAME -o LOCAL_URL

Omitting --collection COLLECTION_NAME will dump entire DB.

jQuery object equality

First order your object based on key using this function

function sortObject(o) {
    return Object.keys(o).sort().reduce((r, k) => (r[k] = o[k], r), {});
}

Then, compare the stringified version of your object, using this funtion

function isEqualObject(a,b){
    return JSON.stringify(sortObject(a)) == JSON.stringify(sortObject(b));
}

Here is an example

Assuming objects keys are ordered differently and are of the same values

var obj1 = {"hello":"hi","world":"earth"}
var obj2 = {"world":"earth","hello":"hi"}

isEqualObject(obj1,obj2);//returns true

Good ways to manage a changelog using git?

A more to-the-point CHANGELOG.

git log --since=1/11/2011 --until=28/11/2011 --no-merges --format=%B

Adding an img element to a div with javascript

function image()
{
    //dynamically add an image and set its attribute
    var img=document.createElement("img");
    img.src="p1.jpg"
    img.id="picture"
    var foo = document.getElementById("fooBar");
    foo.appendChild(img);
}

<span id="fooBar">&nbsp;</span>

What key shortcuts are to comment and uncomment code?

This is how I did it,

Menu ToolsOptions on the EnvironmentKeyboard window

One can alter the default shortcuts following the below steps

  • Select Edit.CommentSelection in the listbox
  • Click on "Remove" button
  • Select "Text Editor" option in the dropdown under "Use new shortcut in:"
  • Press your own shortcut in the textbox under "Press shortcut keys:" Example: Pressing Ctrl+E and then C will give you Ctrl+E, C
  • Click on "Assign" button
  • Repeat the same for Edit.UnCommentSelection (Ctrl+E, U)

Logging framework incompatibility

Just to help those in a similar situation to myself...

This can be caused when a dependent library has accidentally bundled an old version of slf4j. In my case, it was tika-0.8. See https://issues.apache.org/jira/browse/TIKA-556

The workaround is exclude the component and then manually depends on the correct, or patched version.

EG.

<dependency>
    <groupId>org.apache.tika</groupId>
    <artifactId>tika-parsers</artifactId>
    <version>0.8</version>
    <exclusions>
        <exclusion>
            <!-- NOTE: Version 4.2 has bundled slf4j -->
            <groupId>edu.ucar</groupId>
            <artifactId>netcdf</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <!-- Patched version 4.2-min does not bundle slf4j -->
    <groupId>edu.ucar</groupId>
    <artifactId>netcdf</artifactId>
    <version>4.2-min</version>
</dependency>

Android M - check runtime permission - how to determine if the user checked "Never ask again"?

Here is a nice and easy method to check the current permission status:

    @Retention(RetentionPolicy.SOURCE)
    @IntDef({GRANTED, DENIED, BLOCKED_OR_NEVER_ASKED })
    public @interface PermissionStatus {}

    public static final int GRANTED = 0;
    public static final int DENIED = 1;
    public static final int BLOCKED_OR_NEVER_ASKED = 2;

    @PermissionStatus 
    public static int getPermissionStatus(Activity activity, String androidPermissionName) {
        if(ContextCompat.checkSelfPermission(activity, androidPermissionName) != PackageManager.PERMISSION_GRANTED) {
            if(!ActivityCompat.shouldShowRequestPermissionRationale(activity, androidPermissionName)){
                return BLOCKED_OR_NEVER_ASKED;
            }
            return DENIED;
        }
        return GRANTED;
    }

Caveat: returns BLOCKED_OR_NEVER_ASKED the first app start, before the user accepted/denied the permission through the user prompt (on sdk 23+ devices)

Update:

The Android support library now also seems to have a very similar class android.support.v4.content.PermissionChecker which contains a checkSelfPermission() which returns:

public static final int PERMISSION_GRANTED = 0;
public static final int PERMISSION_DENIED = -1;
public static final int PERMISSION_DENIED_APP_OP = -2;

What's the difference between Instant and LocalDateTime?

Table of all date-time types in Java, both modern and legacy

tl;dr

Instant and LocalDateTime are two entirely different animals: One represents a moment, the other does not.

  • Instant represents a moment, a specific point in the timeline.
  • LocalDateTime represents a date and a time-of-day. But lacking a time zone or offset-from-UTC, this class cannot represent a moment. It represents potential moments along a range of about 26 to 27 hours, the range of all time zones around the globe. A LocalDateTime value is inherently ambiguous.

Incorrect Presumption

LocalDateTime is rather date/clock representation including time-zones for humans.

Your statement is incorrect: A LocalDateTime has no time zone. Having no time zone is the entire point of that class.

To quote that class’ doc:

This class does not store or represent a time-zone. Instead, it is a description of the date, as used for birthdays, combined with the local time as seen on a wall clock. It cannot represent an instant on the time-line without additional information such as an offset or time-zone.

So Local… means “not zoned, no offset”.

Instant

enter image description here

An Instant is a moment on the timeline in UTC, a count of nanoseconds since the epoch of the first moment of 1970 UTC (basically, see class doc for nitty-gritty details). Since most of your business logic, data storage, and data exchange should be in UTC, this is a handy class to be used often.

Instant instant = Instant.now() ;  // Capture the current moment in UTC.

OffsetDateTime

enter image description here

The class OffsetDateTime class represents a moment as a date and time with a context of some number of hours-minutes-seconds ahead of, or behind, UTC. The amount of offset, the number of hours-minutes-seconds, is represented by the ZoneOffset class.

If the number of hours-minutes-seconds is zero, an OffsetDateTime represents a moment in UTC the same as an Instant.

ZoneOffset

enter image description here

The ZoneOffset class represents an offset-from-UTC, a number of hours-minutes-seconds ahead of UTC or behind UTC.

A ZoneOffset is merely a number of hours-minutes-seconds, nothing more. A zone is much more, having a name and a history of changes to offset. So using a zone is always preferable to using a mere offset.

ZoneId

enter image description here

A time zone is represented by the ZoneId class.

A new day dawns earlier in Paris than in Montréal, for example. So we need to move the clock’s hands to better reflect noon (when the Sun is directly overhead) for a given region. The further away eastward/westward from the UTC line in west Europe/Africa the larger the offset.

A time zone is a set of rules for handling adjustments and anomalies as practiced by a local community or region. The most common anomaly is the all-too-popular lunacy known as Daylight Saving Time (DST).

A time zone has the history of past rules, present rules, and rules confirmed for the near future.

These rules change more often than you might expect. Be sure to keep your date-time library's rules, usually a copy of the 'tz' database, up to date. Keeping up-to-date is easier than ever now in Java 8 with Oracle releasing a Timezone Updater Tool.

Specify a proper time zone name in the format of Continent/Region, such as America/Montreal, Africa/Casablanca, or Pacific/Auckland. Never use the 2-4 letter abbreviation such as EST or IST as they are not true time zones, not standardized, and not even unique(!).

Time Zone = Offset + Rules of Adjustments

ZoneId z = ZoneId.of( “Africa/Tunis” ) ; 

ZonedDateTime

enter image description here

Think of ZonedDateTime conceptually as an Instant with an assigned ZoneId.

ZonedDateTime = ( Instant + ZoneId )

To capture the current moment as seen in the wall-clock time used by the people of a particular region (a time zone):

ZonedDateTime zdt = ZonedDateTime.now( z ) ;  // Pass a `ZoneId` object such as `ZoneId.of( "Europe/Paris" )`. 

Nearly all of your backend, database, business logic, data persistence, data exchange should all be in UTC. But for presentation to users you need to adjust into a time zone expected by the user. This is the purpose of the ZonedDateTime class and the formatter classes used to generate String representations of those date-time values.

ZonedDateTime zdt = instant.atZone( z ) ;
String output = zdt.toString() ;                 // Standard ISO 8601 format.

You can generate text in localized format using DateTimeFormatter.

DateTimeFormatter f = DateTimeFormatter.ofLocalizedDateTime( FormatStyle.FULL ).withLocale( Locale.CANADA_FRENCH ) ; 
String outputFormatted = zdt.format( f ) ;

mardi 30 avril 2019 à 23 h 22 min 55 s heure de l’Inde

LocalDate, LocalTime, LocalDateTime

Diagram showing only a calendar for a LocalDate.

Diagram showing only a clock for a LocalTime.

Diagram showing a calendar plus clock for a LocalDateTime.

The "local" date time classes, LocalDateTime, LocalDate, LocalTime, are a different kind of critter. The are not tied to any one locality or time zone. They are not tied to the timeline. They have no real meaning until you apply them to a locality to find a point on the timeline.

The word “Local” in these class names may be counter-intuitive to the uninitiated. The word means any locality, or every locality, but not a particular locality.

So for business apps, the "Local" types are not often used as they represent just the general idea of a possible date or time not a specific moment on the timeline. Business apps tend to care about the exact moment an invoice arrived, a product shipped for transport, an employee was hired, or the taxi left the garage. So business app developers use Instant and ZonedDateTime classes most commonly.

So when would we use LocalDateTime? In three situations:

  • We want to apply a certain date and time-of-day across multiple locations.
  • We are booking appointments.
  • We have an intended yet undetermined time zone.

Notice that none of these three cases involve a single certain specific point on the timeline, none of these are a moment.

One time-of-day, multiple moments

Sometimes we want to represent a certain time-of-day on a certain date, but want to apply that into multiple localities across time zones.

For example, "Christmas starts at midnight on the 25th of December 2015" is a LocalDateTime. Midnight strikes at different moments in Paris than in Montréal, and different again in Seattle and in Auckland.

LocalDate ld = LocalDate.of( 2018 , Month.DECEMBER , 25 ) ;
LocalTime lt = LocalTime.MIN ;   // 00:00:00
LocalDateTime ldt = LocalDateTime.of( ld , lt ) ;  // Christmas morning anywhere. 

Another example, "Acme Company has a policy that lunchtime starts at 12:30 PM at each of its factories worldwide" is a LocalTime. To have real meaning you need to apply it to the timeline to figure the moment of 12:30 at the Stuttgart factory or 12:30 at the Rabat factory or 12:30 at the Sydney factory.

Booking appointments

Another situation to use LocalDateTime is for booking future events (ex: Dentist appointments). These appointments may be far enough out in the future that you risk politicians redefining the time zone. Politicians often give little forewarning, or even no warning at all. If you mean "3 PM next January 23rd" regardless of how the politicians may play with the clock, then you cannot record a moment – that would see 3 PM turn into 2 PM or 4 PM if that region adopted or dropped Daylight Saving Time, for example.

For appointments, store a LocalDateTime and a ZoneId, kept separately. Later, when generating a schedule, on-the-fly determine a moment by calling LocalDateTime::atZone( ZoneId ) to generate a ZonedDateTime object.

ZonedDateTime zdt = ldt.atZone( z ) ;  // Given a date, a time-of-day, and a time zone, determine a moment, a point on the timeline.

If needed, you can adjust to UTC. Extract an Instant from the ZonedDateTime.

Instant instant = zdt.toInstant() ;  // Adjust from some zone to UTC. Same moment, same point on the timeline, different wall-clock time.

Unknown zone

Some people might use LocalDateTime in a situation where the time zone or offset is unknown.

I consider this case inappropriate and unwise. If a zone or offset is intended but undetermined, you have bad data. That would be like storing a price of a product without knowing the intended currency (dollars, pounds, euros, etc.). Not a good idea.

All date-time types

For completeness, here is a table of all the possible date-time types, both modern and legacy in Java, as well as those defined by the SQL standard. This might help to place the Instant & LocalDateTime classes in a larger context.

Table of all date-time types in Java (both modern & legacy) as well as SQL standard.

Notice the odd choices made by the Java team in designing JDBC 4.2. They chose to support all the java.time times… except for the two most commonly used classes: Instant & ZonedDateTime.

But not to worry. We can easily convert back and forth.

Converting Instant.

// Storing
OffsetDateTime odt = instant.atOffset( ZoneOffset.UTC ) ;
myPreparedStatement.setObject( … , odt ) ;

// Retrieving
OffsetDateTime odt = myResultSet.getObject( … , OffsetDateTime.class ) ;
Instant instant = odt.toInstant() ;

Converting ZonedDateTime.

// Storing
OffsetDateTime odt = zdt.toOffsetDateTime() ;
myPreparedStatement.setObject( … , odt ) ;

// Retrieving
OffsetDateTime odt = myResultSet.getObject( … , OffsetDateTime.class ) ;
ZoneId z = ZoneId.of( "Asia/Kolkata" ) ;
ZonedDateTime zdt = odt.atZone( z ) ; 

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date, Calendar, & SimpleDateFormat.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

The Joda-Time project, now in maintenance mode, advises migration to the java.time classes.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes. Hibernate 5 & JPA 2.2 support java.time.

Where to obtain the java.time classes?

Table of which java.time library to use with which version of Java or Android

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

How to convert strings into integers in Python?

Try this.

x = "1"

x is a string because it has quotes around it, but it has a number in it.

x = int(x)

Since x has the number 1 in it, I can turn it in to a integer.

To see if a string is a number, you can do this.

def is_number(var):
    try:
        if var == int(var):
            return True
    except Exception:
        return False

x = "1"

y = "test"

x_test = is_number(x)

print(x_test)

It should print to IDLE True because x is a number.

y_test = is_number(y)

print(y_test)

It should print to IDLE False because y in not a number.

In Postgresql, force unique on combination of two columns

If, like me, you landed here with:

  • a pre-existing table,
  • to which you need to add a new column, and
  • also need to add a new unique constraint on the new column as well as an old one, AND
  • be able to undo it all (i.e. write a down migration)

Here is what worked for me, utilizing one of the above answers and expanding it:

-- up

ALTER TABLE myoldtable ADD COLUMN newcolumn TEXT;
ALTER TABLE myoldtable ADD CONSTRAINT myoldtable_oldcolumn_newcolumn_key UNIQUE (oldcolumn, newcolumn);

---

ALTER TABLE myoldtable DROP CONSTRAINT myoldtable_oldcolumn_newcolumn_key;
ALTER TABLE myoldtable DROP COLUMN newcolumn;

-- down

Opening a .ipynb.txt File

Below is the easiest way in case if Anaconda is already installed.

1) Under "Files", there is an option called,"Upload".

2) Click on "Upload" button and it asks for the path of the file and select the file and click on upload button present beside the file.

Bootstrap 3 unable to display glyphicon properly

I had the same problem using a local apache server. This solved my problem:

http://www.ifusio.com/blog/firefox-issue-with-twitter-bootstrap-glyphicons

For Amazon s3 you need to edit your CORS configuration:

<CORSConfiguration>
    <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>GET</AllowedMethod>
        <MaxAgeSeconds>3000</MaxAgeSeconds>
        <AllowedHeader>Authorization</AllowedHeader>
    </CORSRule>
</CORSConfiguration>

Double Iteration in List Comprehension

Order of iterators may seem counter-intuitive.

Take for example: [str(x) for i in range(3) for x in foo(i)]

Let's decompose it:

def foo(i):
    return i, i + 0.5

[str(x)
    for i in range(3)
        for x in foo(i)
]

# is same as
for i in range(3):
    for x in foo(i):
        yield str(x)

jQuery UI accordion that keeps multiple sections open?

Or even simpler?

<div class="accordion">
    <h3><a href="#">First</a></h3>
    <div>Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet.</div>
</div>    
<div class="accordion">
    <h3><a href="#">Second</a></h3>
    <div>Phasellus mattis tincidunt nibh.</div>
</div>         
<div class="accordion">
    <h3><a href="#">Third</a></h3>
    <div>Nam dui erat, auctor a, dignissim quis.</div>
</div>
<script type="text/javascript">
    $(".accordion").accordion({ collapsible: true, active: false });
</script>

How to properly exit a C# application?

This will work from anywhere, inside Form(), Form_Load(), or any event handler. I posted before, but I don't see it now?!?

public void exit(int exitCode)
{
    if (System.Windows.Forms.Application.MessageLoop)
    {
       // Use this since we are in a running Form
       System.Windows.Forms.Application.Exit();
       System.Environment.Exit(exitCode);
    }
    else
    {
       // Form ended or never .Run
       System.Environment.Exit(exitCode);
    }
} //* end exit()

phpexcel to download

FOR XLSX USE

SET IN $xlsName name from XLSX with extension. Example: $xlsName = 'teste.xlsx';

$objPHPExcel = new PHPExcel();

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="'.$xlsName.'"');
header('Cache-Control: max-age=0');
$objWriter->save('php://output');

FOR XLS USE

SET IN $xlsName name from XLS with extension. Example: $xlsName = 'teste.xls';

$objPHPExcel = new PHPExcel();

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="'.$xlsName.'"');
header('Cache-Control: max-age=0');
$objWriter->save('php://output');

Two decimal places using printf( )

Try using a format like %d.%02d

int iAmount = 10050;
printf("The number with fake decimal point is %d.%02d", iAmount/100, iAmount%100);

Another approach is to type cast it to double before printing it using %f like this:

printf("The number with fake decimal point is %0.2f", (double)(iAmount)/100);

My 2 cents :)

Can I style an image's ALT text with CSS?

You can use img[alt] {styles} to style only the alternative text.

Find by key deep in a nested array

Recursion is your friend. I updated the function to account for property arrays:

function getObject(theObject) {
    var result = null;
    if(theObject instanceof Array) {
        for(var i = 0; i < theObject.length; i++) {
            result = getObject(theObject[i]);
            if (result) {
                break;
            }   
        }
    }
    else
    {
        for(var prop in theObject) {
            console.log(prop + ': ' + theObject[prop]);
            if(prop == 'id') {
                if(theObject[prop] == 1) {
                    return theObject;
                }
            }
            if(theObject[prop] instanceof Object || theObject[prop] instanceof Array) {
                result = getObject(theObject[prop]);
                if (result) {
                    break;
                }
            } 
        }
    }
    return result;
}

updated jsFiddle: http://jsfiddle.net/FM3qu/7/

How do I pass a class as a parameter in Java?

public void foo(Class c){
        try {
            Object ob = c.newInstance();
        } catch (InstantiationException ex) {
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

How to invoke method using reflection

 import java.lang.reflect.*;


   public class method2 {
      public int add(int a, int b)
      {
         return a + b;
      }

      public static void main(String args[])
      {
         try {
           Class cls = Class.forName("method2");
           Class partypes[] = new Class[2];
            partypes[0] = Integer.TYPE;
            partypes[1] = Integer.TYPE;
            Method meth = cls.getMethod(
              "add", partypes);
            method2 methobj = new method2();
            Object arglist[] = new Object[2];
            arglist[0] = new Integer(37);
            arglist[1] = new Integer(47);
            Object retobj 
              = meth.invoke(methobj, arglist);
            Integer retval = (Integer)retobj;
            System.out.println(retval.intValue());
         }
         catch (Throwable e) {
            System.err.println(e);
         }
      }
   }

Also See

Xcode 6.1 - How to uninstall command line tools?

An excerpt from an apple technical note (Thanks to matthias-bauch)

Xcode includes all your command-line tools. If it is installed on your system, remove it to uninstall your tools.

If your tools were downloaded separately from Xcode, then they are located at /Library/Developer/CommandLineTools on your system. Delete the CommandLineTools folder to uninstall them.

you could easily delete using terminal:

Here is an article that explains how to remove the command line tools but do it at your own risk.Try this only if any of the above doesn't work.

How to add element in List while iterating in java?

I do this by adding the elements to an new, empty tmp List, then adding the tmp list to the original list using addAll(). This prevents unnecessarily copying a large source list.

Imagine what happens when the OP's original list has a few million items in it; for a while you'll suck down twice the memory.

In addition to conserving resources, this technique also prevents us from having to resort to 80s-style for loops and using what are effectively array indexes which could be unattractive in some cases.

Why does my JavaScript code receive a "No 'Access-Control-Allow-Origin' header is present on the requested resource" error, while Postman does not?

The error you get is due to the CORS standard, which sets some restrictions on how JavaScript can perform ajax requests.

The CORS standard is a client-side standard, implemented in the browser. So it is the browser which prevent the call from completing and generates the error message - not the server.

Postman does not implement the CORS restrictions, which is why you don't see the same error when making the same call from Postman.

How to auto adjust the <div> height according to content in it?

You could try, div tag will auto fit height with content inside:

height: fit-content;

Windows 7 - Add Path

I founded the problem: Just insert the folder without the executable file.
so Instead of:

C:\Program Files (x86)\SumatraPDF\SumatraPDF.exe

you have to write this:

C:\Program Files (x86)\SumatraPDF\

How to upgrade R in ubuntu?

Since R is already installed, you should be able to upgrade it with this method. First of all, you may want to have the packages you installed in the previous version in the new one,so it is convenient to check this post. Then, follow the instructions from here

  1. Open the sources.list file:

     sudo nano /etc/apt/sources.list    
    
  2. Add a line with the source from where the packages will be retrieved. For example:

     deb https://cloud.r-project.org/bin/linux/ubuntu/ version/
    

    Replace https://cloud.r-project.org with whatever mirror you would like to use, and replace version/ with whatever version of Ubuntu you are using (eg, trusty/, xenial/, and so on). If you're getting a "Malformed line error", check to see if you have a space between /ubuntu/ and version/.

  3. Fetch the secure APT key:

     gpg --keyserver keyserver.ubuntu.com --recv-key E298A3A825C0D65DFD57CBB651716619E084DAB9
    

or

    gpg --hkp://keyserver keyserver.ubuntu.com:80 --recv-key E298A3A825C0D65DFD57CBB651716619E084DAB9
  1. Add it to keyring:

     gpg -a --export E084DAB9 | sudo apt-key add -
    
  2. Update your sources and upgrade your installation:

     sudo apt-get update && sudo apt-get upgrade
    
  3. Install the new version

     sudo apt-get install r-base-dev
    
  4. Recover your old packages following the solution that best suits to you (see this). For instance, to recover all the packages (not only those from CRAN) the idea is:

-- copy the packages from R-oldversion/library to R-newversion/library, (do not overwrite a package if it already exists in the new version!).

-- Run the R command update.packages(checkBuilt=TRUE, ask=FALSE).

How to pass optional parameters while omitting some other optional parameters?

you can use optional variable by ? or if you have multiple optional variable by ..., example:

function details(name: string, country="CA", address?: string, ...hobbies: string) {
    // ...
}

In the above:

  • name is required
  • country is required and has a default value
  • address is optional
  • hobbies is an array of optional params

Woocommerce get products

Always use tax_query to get posts/products from a particular category or any other taxonomy. You can also get the products using ID/slug of particular taxonomy...

$the_query = new WP_Query( array(
    'post_type' => 'product',
    'tax_query' => array(
        array (
            'taxonomy' => 'product_cat',
            'field' => 'slug',
            'terms' => 'accessories',
        )
    ),
) );

while ( $the_query->have_posts() ) :
    $the_query->the_post();
    the_title(); echo "<br>";
endwhile;


wp_reset_postdata();

Change directory in PowerShell

If your Folder inside a Drive contains spaces In Power Shell you can Simply Type the command then drive name and folder name within Single Quotes(''):

Set-Location -Path 'E:\FOLDER NAME'

The Screenshot is attached here

Return from a promise then()

Promises don't "return" values, they pass them to a callback (which you supply with .then()).

It's probably trying to say that you're supposed to do resolve(someObject); inside the promise implementation.

Then in your then code you can reference someObject to do what you want.

The character encoding of the plain text document was not declared - mootool script

If anyone is using SQL and they have meta tags there and still the error is shown, this happens because of your connection from .net to SQL.

In you appsettings.json update your connection string to have: Persist Security Info=True. So your connection string should look like this:

"DefaultConnection": "Server=[[server]];Initial Catalog=[[db]];Persist Security Info=True;User ID=[[user]];Password=[[pass]];MultipleActiveResultSets=False;Encrypt=True;TrustServerCertificate=False;Connection Timeout=30;"

Fatal error: Call to undefined function mb_strlen()

This worked for me on Debian stretch

sudo apt-get update
sudo apt install php-mbstring
service apache2 restart

How to change the value of attribute in appSettings section with Web.config transformation

I do not like transformations to have any more info than needed. So instead of restating the keys, I simply state the condition and intention. It is much easier to see the intention when done like this, at least IMO. Also, I try and put all the xdt attributes first to indicate to the reader, these are transformations and not new things being defined.

<appSettings>
  <add xdt:Locator="Condition(@key='developmentModeUserId')" xdt:Transform="Remove" />
  <add xdt:Locator="Condition(@key='developmentMode')" xdt:Transform="SetAttributes"
       value="false"/>
</appSettings>

In the above it is much easier to see that the first one is removing the element. The 2nd one is setting attributes. It will set/replace any attributes you define here. In this case it will simply set value to false.

Selenium WebDriver and DropDown Boxes

You can use this

(new SelectElement(driver.FindElement(By.Id(""))).SelectByText("");

$(window).height() vs $(document).height

This fixed me

var width = window.innerWidth;
var height = window.innerHeight;

Running bash script from within python

Actually, you just have to add the shell=True argument:

subprocess.call("sleep.sh", shell=True)

But beware -

Warning Invoking the system shell with shell=True can be a security hazard if combined with untrusted input. See the warning under Frequently Used Arguments for details.

source

What is the best way to clone/deep copy a .NET generic Dictionary<string, T>?

You could always use serialization. You could serialize the object then deserialize it. That will give you a deep copy of the Dictionary and all the items inside of it. Now you can create a deep copy of any object that is marked as [Serializable] without writing any special code.

Here are two methods that will use Binary Serialization. If you use these methods you simply call

object deepcopy = FromBinary(ToBinary(yourDictionary));

public Byte[] ToBinary()
{
  MemoryStream ms = null;
  Byte[] byteArray = null;
  try
  {
    BinaryFormatter serializer = new BinaryFormatter();
    ms = new MemoryStream();
    serializer.Serialize(ms, this);
    byteArray = ms.ToArray();
  }
  catch (Exception unexpected)
  {
    Trace.Fail(unexpected.Message);
    throw;
  }
  finally
  {
    if (ms != null)
      ms.Close();
  }
  return byteArray;
}

public object FromBinary(Byte[] buffer)
{
  MemoryStream ms = null;
  object deserializedObject = null;

  try
  {
    BinaryFormatter serializer = new BinaryFormatter();
    ms = new MemoryStream();
    ms.Write(buffer, 0, buffer.Length);
    ms.Position = 0;
    deserializedObject = serializer.Deserialize(ms);
  }
  finally
  {
    if (ms != null)
      ms.Close();
  }
  return deserializedObject;
}

Limit file format when using <input type="file">?

Use input tag with accept attribute

<input type="file" name="my-image" id="image" accept="image/gif, image/jpeg, image/png" />

Click here for the latest browser compatibility table

Live demo here

To select only image files, you can use this accept="image/*"

<input type="file" name="my-image" id="image" accept="image/*" />

Live demo here

Only gif, jpg and png will be shown, screen grab from Chrome version 44 Only gif, jpg and png will be shown, screen grab from Chrome version 44

How to check if a variable is equal to one string or another string?

if var == 'stringone' or var == 'stringtwo':
    do_something()

or more pythonic,

if var in ['string one', 'string two']:
    do_something()

Print an ArrayList with a for-each loop

import java.util.ArrayList;
import java.util.List;

class ArrLst{

    public static void main(String args[]){

        List l=new ArrayList();
        l.add(10);
        l.add(11);
        l.add(12);
        l.add(13);
        l.add(14);
        l.forEach((a)->System.out.println(a));
    }
}

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

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

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

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

Or a one liner:

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

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

ElasticSearch: Unassigned Shards, how to fix?

I had the same problem but the root cause was a difference in version numbers (1.4.2 on two nodes (with problems) and 1.4.4 on two nodes (ok)). The first and second answers (setting "index.routing.allocation.disable_allocation" to false and setting "cluster.routing.allocation.enable" to "all") did not work.

However, the answer by @Wilfred Hughes (setting "cluster.routing.allocation.enable" to "all" using transient) gave me an error with the following statement:

[NO(target node version [1.4.2] is older than source node version [1.4.4])]

After updating the old nodes to 1.4.4 these nodes started to resnc with the other good nodes.

Good ways to sort a queryset? - Django

I just wanted to illustrate that the built-in solutions (SQL-only) are not always the best ones. At first I thought that because Django's QuerySet.objects.order_by method accepts multiple arguments, you could easily chain them:

ordered_authors = Author.objects.order_by('-score', 'last_name')[:30]

But, it does not work as you would expect. Case in point, first is a list of presidents sorted by score (selecting top 5 for easier reading):

>>> auths = Author.objects.order_by('-score')[:5]
>>> for x in auths: print x
... 
James Monroe (487)
Ulysses Simpson (474)
Harry Truman (471)
Benjamin Harrison (467)
Gerald Rudolph (464)

Using Alex Martelli's solution which accurately provides the top 5 people sorted by last_name:

>>> for x in sorted(auths, key=operator.attrgetter('last_name')): print x
... 
Benjamin Harrison (467)
James Monroe (487)
Gerald Rudolph (464)
Ulysses Simpson (474)
Harry Truman (471)

And now the combined order_by call:

>>> myauths = Author.objects.order_by('-score', 'last_name')[:5]
>>> for x in myauths: print x
... 
James Monroe (487)
Ulysses Simpson (474)
Harry Truman (471)
Benjamin Harrison (467)
Gerald Rudolph (464)

As you can see it is the same result as the first one, meaning it doesn't work as you would expect.

How to connect to a MySQL Data Source in Visual Studio

Right Click the Project in Solution Explorer and click Manage NuGet Packages

Search for MySql.Data package, when you find it click on Install

Here is the sample controller which connects to MySql database using the mysql package. We mainly make use of MySqlConnection connection object.

 public class HomeController : Controller
{
    public ActionResult Index()
    {
        List<employeemodel> employees = new List<employeemodel>();
        string constr = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
        using (MySqlConnection con = new MySqlConnection(constr))
        {
            string query = "SELECT EmployeeId, Name, Country FROM Employees";
            using (MySqlCommand cmd = new MySqlCommand(query))
            {
                cmd.Connection = con;
               con.Open();
                using (MySqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        employees.Add(new EmployeeModel
                        {
                            EmployeeId = Convert.ToInt32(sdr["EmployeeId"]),
                            Name = sdr["Name"].ToString(),
                            Country = sdr["Country"].ToString()
                        });
                    }
                }
                con.Close();
            }
        }

        return View(employees);
    }
}

ssh remote host identification has changed

Simple one-liner solution, tested on mac:

sed '/212.156.48.110/d' ~/.ssh/known_hosts > ~/.ssh/known_hosts

Deletes only the target ssh host IP from know hosts.

where 212.156.48.110 is replaced by the target host IP address.

Cause: Happened because the target IP was already known for a different machine due to port forwarding. Deleting the target IP before connecting will fix the issue.

setTimeout or setInterval?

The difference is obvious in console:

enter image description here

Export to csv/excel from kibana

FYI : How to download data in CSV from Kibana:

In Kibana--> 1. Go to 'Discover' in left side

  1. Select Index Field (based on your dashboard data) (*** In case if you are not sure which index to select-->go to management tab-->Saved Objects-->Dashboard-->select dashboard name-->scroll down to JSON-->you will see the Index name )

  2. left side you see all the variables available in the data-->click over the variable name that you want to have in csv-->click add-->this variable will be added on the right side of the columns avaliable

  3. Top right section of the kibana-->there is the time filter-->click -->select the duration for which you want the csv

  4. Top upper right -->Reporting-->save this time/variable selection with a new report-->click generate CSV

  5. Go to 'Management' in left side--> 'Reporting'-->download your csv

How do I get HTTP Request body content in Laravel?

I don't think you want the data from your Request, I think you want the data from your Response. The two are different. Also you should build your response correctly in your controller.

Looking at the class in edit #2, I would make it look like this:

class XmlController extends Controller
{
    public function index()
    {
        $content = Request::all();
        return Response::json($content);
    }
}

Once you've gotten that far you should check the content of your response in your test case (use print_r if necessary), you should see the data inside.

More information on Laravel responses here:

http://laravel.com/docs/5.0/responses

How do I turn off PHP Notices?

Used This Line In Your Code

error_reporting(E_ALL ^ E_NOTICE);  

I think its helf full to you.

How can I check whether a variable is defined in Node.js?

Determine if property is existing (but is not a falsy value):

if (typeof query !== 'undefined' && query !== null){
   doStuff();
}

Usually using

if (query){
   doStuff();
}

is sufficient. Please note that:

if (!query){
   doStuff();
}

doStuff() will execute even if query was an existing variable with falsy value (0, false, undefined or null)

Btw, there's a sexy coffeescript way of doing this:

if object?.property? then doStuff()

which compiles to:

if ((typeof object !== "undefined" && object !== null ? object.property : void 0) != null) 

{
  doStuff();
}

ToList()-- does it create a new list?

The accepted answer correctly addresses the OP's question based on his example. However, it only applies when ToList is applied to a concrete collection; it does not hold when the elements of the source sequence have yet to be instantiated (due to deferred execution). In case of the latter, you might get a new set of items each time you call ToList (or enumerate the sequence).

Here is an adaptation of the OP's code to demonstrate this behaviour:

public static void RunChangeList()
{
    var objs = Enumerable.Range(0, 10).Select(_ => new MyObject() { SimpleInt = 0 });
    var whatInt = ChangeToList(objs);   // whatInt gets 0
}

public static int ChangeToList(IEnumerable<MyObject> objects)
{
    var objectList = objects.ToList();
    objectList.First().SimpleInt = 5;
    return objects.First().SimpleInt;
}

Whilst the above code may appear contrived, this behaviour can appear as a subtle bug in other scenarios. See my other example for a situation where it causes tasks to get spawned repeatedly.

What are the advantages and disadvantages of recursion?

Expressiveness

Most problems are naturally expressed by recursion such as Fibonacci, Merge sorting and quick sorting. In this respect, the code is written for humans, not machines.

Immutability

Iterative solutions often rely on varying temporary variables which makes the code hard to read. This can be avoided with recursion.

Performance

Recursion is not stack friendly. Stack can overflow when the recursion is not well designed or tail optimization is not supported.

jQuery Ajax error handling, show custom exception messages

Make sure you're setting Response.StatusCode to something other than 200. Write your exception's message using Response.Write, then use...

xhr.responseText

..in your javascript.

Use python requests to download CSV

You can also use the DictReader to iterate dictionaries of {'columnname': 'value', ...}

import csv
import requests

response = requests.get('http://example.test/foo.csv')
reader = csv.DictReader(response.iter_lines())
for record in reader:
    print(record)

Nested JSON: How to add (push) new items to an object?

If your JSON is without key you can do it like this:

library[library.length] = {"foregrounds" : foregrounds,"backgrounds" : backgrounds};

So, try this:

var library = {[{
    "title"       : "Gold Rush",
        "foregrounds" : ["Slide 1","Slide 2","Slide 3"],
        "backgrounds" : ["1.jpg","","2.jpg"]
    }, {
    "title"       : California",
        "foregrounds" : ["Slide 1","Slide 2","Slide 3"],
        "backgrounds" : ["3.jpg","4.jpg","5.jpg"]
    }]
}

Then:

library[library.length] = {"title" : "Gold Rush", "foregrounds" : ["Howdy","Slide 2"], "backgrounds" : ["1.jpg",""]};

In ASP.NET, when should I use Session.Clear() rather than Session.Abandon()?

I had this issue and tried both, but had to settle for removing crap like "pageEditState", but not removing user info lest I have to look it up again.

public static void RemoveEverythingButUserInfo()
{
    foreach (String o in HttpContext.Current.Session.Keys)
    {
        if (o != "UserInfoIDontWantToAskForAgain")
            keys.Add(o);
    }
}

Calling a Fragment method from a parent Activity

I think the best is to check if fragment is added before calling method in fragment. Do something like this to avoid null exception.

ExampleFragment fragment = (ExampleFragment) getFragmentManager().findFragmentById(R.id.example_fragment);
if(fragment.isAdded()){
  fragment.<specific_function_name>(); 
}

How to get last items of a list in Python?

You can use negative integers with the slicing operator for that. Here's an example using the python CLI interpreter:

>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]

the important line is a[-9:]

How to move an element down a litte bit in html

You can use vertical-align to move items vertically.

Example:

<div>This is an <span style="vertical-align: -20px;">example</span></div>

This will move the span containing the word 'example' downwards 20 pixels compared to the rest of the text.

The intended use for this property is to align elements of different height (e.g. images with different sizes) along a set line. vertical-align: top will for instance align all images on a line with the top of each image aligning with each other. vertical-align: middle will align all images so that the middle of the images align with each other, regardless of the height of each image.

You can see visual examples in this CodePen by Chris Coyier.

Hope that helps!

How do I break a string across more than one line of code in JavaScript?

I tried a number of the above suggestions but got an ILLEGAL character warning in Chrome code inspector. The following worked for me (only tested in Chrome though!)

alert('stuff on line 1\\nstuff on line 2);

comes out like...

stuff on line 1
stuff on line 2

NOTE the double backslash!!...this seems to be important!

Is there a command to refresh environment variables from the command prompt in Windows?

This works on windows 7: SET PATH=%PATH%;C:\CmdShortcuts

tested by typing echo %PATH% and it worked, fine. also set if you open a new cmd, no need for those pesky reboots any more :)

List<T> or IList<T>

List<T> is a specific implementation of IList<T>, which is a container that can be addressed the same way as a linear array T[] using an integer index. When you specify IList<T> as the type of the method's argument, you only specify that you need certain capabilities of the container.

For example, the interface specification does not enforce a specific data structure to be used. The implementation of List<T> happens to the same performance for accessing, deleting and adding elements as a linear array. However, you could imagine an implementation that is backed by a linked list instead, for which adding elements to the end is cheaper (constant-time) but random-access much more expensive. (Note that the .NET LinkedList<T> does not implement IList<T>.)

This example also tells you that there may be situations when you need to specify the implementation, not the interface, in the argument list: In this example, whenever you require a particular access performance characteristic. This is usually guaranteed for a specific implementation of a container (List<T> documentation: "It implements the IList<T> generic interface using an array whose size is dynamically increased as required.").

Additionally, you might want to consider exposing the least functionality you need. For example. if you don't need to change the content of the list, you should probably consider using IEnumerable<T>, which IList<T> extends.

How to create a jQuery function (a new jQuery method or plugin)?

You can always do this:

jQuery.fn.extend({
   myfunction: function(param){
       // code here
   },
});
OR
jQuery.extend({
   myfunction: function(param){
       // code here
   },
});
$(element).myfunction(param);

How can I reference a dll in the GAC from Visual Studio?

Registering assmblies into the GAC does not then place a reference to the assembly in the add references dialog. You still need to reference the assembly by path for your project, the main difference being you do not need to use the copy local option, your app will find it at runtime.

In this particular case, you just need to reference your assembly by path (browse) or if you really want to have it in the add reference dialog there is a registry setting where you can add additional paths.

Note, if you ship your app to someone who does not have this assembly installed you will need to ship it, and in this case you really need to use the SharedManagementObjects.msi redistributable.

Firebase FCM notifications click_action payload

You can handle all your actions in function of your message in onMessageReceived() in your service extending FirebaseMessagingService. In order to do that, you must send a message containing exclusively data, using for example Advanced REST client in Chrome. Then you send a POST to https://fcm.googleapis.com/fcm/send using in "Raw headers":

Content-Type: application/json Authorization: key=YOUR_PERSONAL_FIREBASE_WEB_API_KEY

And a json message in the field "Raw payload".

Warning, if there is the field "notification" in your json, your message will never be received when app in background in onMessageReceived(), even if there is a data field ! For example, doing that, message work just if app in foreground:

{
    "condition": " 'Symulti' in topics || 'SymultiLite' in topics",
    "priority" : "normal",
    "time_to_live" : 0,
    "notification" : {
        "body" : "new Symulti update !",
        "title" : "new Symulti update !",
        "icon" : "ic_notif_symulti"
    },
    "data" : {
        "id" : 1,
        "text" : "new Symulti update !"
    }
}

In order to receive your message in all cases in onMessageReceived(), simply remove the "notification" field from your json !

Example:

{
    "condition": " 'Symulti' in topics || 'SymultiLite' in topics",
    "priority" : "normal",
    "time_to_live" : 0,,
    "data" : {
        "id" : 1,
        "text" : "new Symulti update !",
        "link" : "href://www.symulti.com"
    }
}

and in your FirebaseMessagingService :

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
      String message = "";
      obj = remoteMessage.getData().get("text");
      if (obj != null) {
        try {
          message = obj.toString();
        } catch (Exception e) {
          message = "";
          e.printStackTrace();
        }
      }

      String link = "";
      obj = remoteMessage.getData().get("link");
      if (obj != null) {
        try {
          link = (String) obj;
        } catch (Exception e) {
          link = "";
          e.printStackTrace();
        }
      }

      Intent intent;
      PendingIntent pendingIntent;
      if (link.equals("")) { // Simply run your activity
        intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
      } else { // open a link
        String url = "";
        if (!link.equals("")) {
          intent = new Intent(Intent.ACTION_VIEW);
          intent.setData(Uri.parse(link));
          intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        }
      }
      pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
          PendingIntent.FLAG_ONE_SHOT);


      NotificationCompat.Builder notificationBuilder = null;

      try {
        notificationBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(R.drawable.ic_notif_symulti)          // don't need to pass icon with your message if it's already in your app !
            .setContentTitle(URLDecoder.decode(getString(R.string.app_name), "UTF-8"))
            .setContentText(URLDecoder.decode(message, "UTF-8"))
            .setAutoCancel(true)
            .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
            .setContentIntent(pendingIntent);
        } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
        }

        if (notificationBuilder != null) {
          NotificationManager notificationManager =
              (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
          notificationManager.notify(id, notificationBuilder.build());
        } else {
          Log.d(TAG, "error NotificationManager");
        }
      }
    }
}

Enjoy !

Setting values on a copy of a slice from a DataFrame

This warning comes because your dataframe x is a copy of a slice. This is not easy to know why, but it has something to do with how you have come to the current state of it.

You can either create a proper dataframe out of x by doing

x = x.copy()

This will remove the warning, but it is not the proper way

You should be using the DataFrame.loc method, as the warning suggests, like this:

x.loc[:,'Mass32s'] = pandas.rolling_mean(x.Mass32, 5).shift(-2)

Setting up MySQL and importing dump within Dockerfile

What I did was download my sql dump in a "db-dump" folder, and mounted it:

mysql:
 image: mysql:5.6
 environment:
   MYSQL_ROOT_PASSWORD: pass
 ports:
   - 3306:3306
 volumes:
   - ./db-dump:/docker-entrypoint-initdb.d

When I run docker-compose up for the first time, the dump is restored in the db.

MSBUILD : error MSB1008: Only one project can be specified

I was using single quotes around the password parameter when I got the error

/p:password='my secret' bad

and changed it to use double quotes to resolve the issue.

/p:password="my secret" good

Likely the same would apply to any parameter that needs quotes for values that contain a space.

c# - approach for saving user settings in a WPF application?

  1. In all the places I've worked, database has been mandatory because of application support. As Adam said, the user might not be at his desk or the machine might be off, or you might want to quickly change someone's configuration or assign a new-joiner a default (or team member's) config.

  2. If the settings are likely to grow as new versions of the application are released, you might want to store the data as blobs which can then be deserialized by the application. This is especially useful if you use something like Prism which discovers modules, as you can't know what settings a module will return. The blobs could be keyed by username/machine composite key. That way you can have different settings for every machine.

  3. I've not used the in-built Settings class much so I'll abstain from commenting. :)

Execution failed app:processDebugResources Android Studio

In my case i had two declaration of

<?xml version="1.0" encoding="utf-8"?>

in my vector drawable icon

all i had to do was delete one

How do I run a Python program?

In IDLE press F5

You can open your .py file with IDLE and press F5 to run it.

You can open that same file with other editor ( like Komodo as you said ) save it and press F5 again; F5 works with IDLE ( even when the editing is done with another tool ).

If you want to run it directly from Komodo according to this article: Executing Python Code Within Komodo Edit you have to:

  1. go to Toolbox -> Add -> New Command...
  2. in the top field enter the name 'Run Python file'
  3. in the 'Command' field enter this text:

    %(python) %F 3.a optionall click on the 'Key Binding' tab and assign a key command to this command

  4. click Ok.

Angular JS: Full example of GET/POST/DELETE/PUT client for a REST/CRUD backend?

Because your update uses PUT method, {entryId: $scope.entryId} is considered as data, to tell angular generate from the PUT data, you need to add params: {entryId: '@entryId'} when you define your update, which means

return $resource('http://localhost\\:3000/realmen/:entryId', {}, {
  query: {method:'GET', params:{entryId:''}, isArray:true},
  post: {method:'POST'},
  update: {method:'PUT', params: {entryId: '@entryId'}},
  remove: {method:'DELETE'}
});

Fix: Was missing a closing curly brace on the update line.

How to execute command stored in a variable?

If you just do eval $cmd when we do cmd="ls -l" (interactively and in a script) we get the desired result. In your case, you have a pipe with a grep without a pattern, so the grep part will fail with an error message. Just $cmd will generate a "command not found" (or some such) message. So try use eval and use a finished command, not one that generates an error message.

Editor does not contain a main type

Try 'Update Project'. Once I did this, The Run as Java Application option appeared.

Visual Studio 2010 always thinks project is out of date, but nothing has changed

I'm using Visual Studio 2013 Professional with Update 4 but didn't find resolution with any of the other suggestions, however, I did manage to resolve the issue for my Team project.

Here's what I did to cause the problem -

  • Created a new class object (Project -> Add Class)
  • Renamed the file via Solution Explorer and clicked yes when asked if I wanted to automatically rename all references to match

Here's what I did to solve the problem -

  • Go to Team Explorer Home
  • Click Source Control Explorer
  • Drill into the folder where all of the class/project files are
  • Found the ORIGINAL filename in the list and deleted it via right-click
  • Build

If this is the case for you then just be extra sure that you're deleting the phantom file rather than the actual one you want to keep in the project.

Impact of Xcode build options "Enable bitcode" Yes/No

  • What does the ENABLE_BITCODE actually do, will it be a non-optional requirement in the future?

I'm not sure at what level you are looking for an answer at, so let's take a little trip. Some of this you may already know.

When you build your project, Xcode invokes clang for Objective-C targets and swift/swiftc for Swift targets. Both of these compilers compile the app to an intermediate representation (IR), one of these IRs is bitcode. From this IR, a program called LLVM takes over and creates the binaries needed for x86 32 and 64 bit modes (for the simulator) and arm6/arm7/arm7s/arm64 (for the device). Normally, all of these different binaries are lumped together in a single file called a fat binary.

The ENABLE_BITCODE option cuts out this final step. It creates a version of the app with an IR bitcode binary. This has a number of nice features, but one giant drawback: it can't run anywhere. In order to get an app with a bitcode binary to run, the bitcode needs to be recompiled (maybe assembled or transcoded… I'm not sure of the correct verb) into an x86 or ARM binary.

When a bitcode app is submitted to the App Store, Apple will do this final step and create the finished binaries.

Right now, bitcode apps are optional, but history has shown Apple turns optional things into requirements (like 64 bit support). This usually takes a few years, so third party developers (like Parse) have time to update.

  • can I use the above method without any negative impact and without compromising a future appstore submission?

Yes, you can turn off ENABLE_BITCODE and everything will work just like before. Until Apple makes bitcode apps a requirement for the App Store, you will be fine.

  • Are there any performance impacts if I enable / disable it?

There will never be negative performance impacts for enabling it, but internal distribution of an app for testing may get more complicated.

As for positive impacts… well that's complicated.

For distribution in the App Store, Apple will create separate versions of your app for each machine architecture (arm6/arm7/arm7s/arm64) instead of one app with a fat binary. This means the app installed on iOS devices will be smaller.

In addition, when bitcode is recompiled (maybe assembled or transcoded… again, I'm not sure of the correct verb), it is optimized. LLVM is always working on creating new a better optimizations. In theory, the App Store could recreate the separate version of the app in the App Store with each new release of LLVM, so your app could be re-optimized with the latest LLVM technology.

Detect merged cells in VBA Excel with MergeArea

While working with selected cells as shown by @tbur can be useful, it's also not the only option available.

You can use Range() like so:

If Worksheets("Sheet1").Range("A1").MergeCells Then
  Do something
Else
  Do something else
End If

Or:

If Worksheets("Sheet1").Range("A1:C1").MergeCells Then
  Do something
Else
  Do something else
End If

Alternately, you can use Cells():

If Worksheets("Sheet1").Cells(1, 1).MergeCells Then
  Do something
Else
  Do something else
End If

How do you uninstall the package manager "pip", if installed from source?

I was using above command but it was not working. This command worked for me:

python -m pip uninstall pip setuptools

How to make a 3D scatter plot in Python?

You can use matplotlib for this. matplotlib has a mplot3d module that will do exactly what you want.

from matplotlib import pyplot
from mpl_toolkits.mplot3d import Axes3D
import random


fig = pyplot.figure()
ax = Axes3D(fig)

sequence_containing_x_vals = list(range(0, 100))
sequence_containing_y_vals = list(range(0, 100))
sequence_containing_z_vals = list(range(0, 100))

random.shuffle(sequence_containing_x_vals)
random.shuffle(sequence_containing_y_vals)
random.shuffle(sequence_containing_z_vals)

ax.scatter(sequence_containing_x_vals, sequence_containing_y_vals, sequence_containing_z_vals)
pyplot.show()

The code above generates a figure like:

matplotlib 3D image

Floating point comparison functions for C#

I think your second option is the best bet. Generally in floating-point comparison you often only care that one value is within a certain tolerance of another value, controlled by the selection of epsilon.

C: printf a float value

Use %.6f. This will print 6 decimals.

jQuery Scroll To bottom of the page

function scrollToBottom() {
     $("#mContainer").animate({ scrollTop: $("#mContainer")[0].scrollHeight }, 1000);
}

This is the solution work from me and you find, I'm sure

Print array elements on separate lines in Bash?

I've discovered that you can use eval to avoid using a subshell. Thus:

IFS=$'\n' eval 'echo "${my_array[*]}"'

What column type/length should I use for storing a Bcrypt hashed password in a Database?

I don't think that there are any neat tricks you can do storing this as you can do for example with an MD5 hash.

I think your best bet is to store it as a CHAR(60) as it is always 60 chars long

SecurityException during executing jnlp file (Missing required Permissions manifest attribute in main jar)

JAR File Manifest Attributes for Security

The JAR file manifest contains information about the contents of the JAR file, including security and configuration information.

Add the attributes to the manifest before the JAR file is signed.
See Modifying a Manifest File in the Java Tutorial for information on adding attributes to the JAR manifest file.

Permissions Attribute

The Permissions attribute is used to verify that the permissions level requested by the RIA when it runs matches the permissions level that was set when the JAR file was created.

Use this attribute to help prevent someone from re-deploying an application that is signed with your certificate and running it at a different privilege level. Set this attribute to one of the following values:

  • sandbox - runs in the security sandbox and does not require additional permissions.

  • all-permissions - requires access to the user's system resources.

Changes to Security Slider:

The following changes to Security Slider were included in this release(7u51):

  • Block Self-Signed and Unsigned applets on High Security Setting
  • Require Permissions Attribute for High Security Setting
  • Warn users of missing Permissions Attributes for Medium Security Setting

For more information, see Java Control Panel documentation.

enter image description here

sample MANIFEST.MF

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.3
Created-By: 1.7.0_51-b13 (Oracle Corporation)
Trusted-Only: true
Class-Path: lib/plugin.jar
Permissions: sandbox
Codebase: http://myweb.de http://www.myweb.de
Application-Name: summary-applet

How do I use Apache tomcat 7 built in Host Manager gui?

Solution for a fresh install of Tomcat 7 on Ubuntu 12.04.

Edit this file - /etc/tomcat7/tomcat-users.xml to add this xml section -

<tomcat-users>
<role rolename="admin"/>
<role rolename="admin-gui"/>
<role rolename="manager-gui"/>
<user username="tomcatadmin" password="tomcat2009" roles="admin,admin-gui,manager-gui"/>
</tomcat-users>

restart Tomcat -

service tomcat7 restart

urls to access managers -

  1. tomcat test page - http://localhost:8080/
  2. manager webapp - http://localhost:8080/manager/html
  3. host-manager webapp - http://localhost:8080/host-manager/html

just wanted to put the latest info out there.

Ruby: How to get the first character of a string

In Rails

name = 'Smith'
name.first 

How to reload the current route with the angular 2 router

There are different approaches to refresh the current route

Change router behaviour (Since Angular 5.1) Set the routers onSameUrlNavigation to 'reload'. This will emit the router events on same URL Navigation.

  • You can then handle them by subscribing to a route
  • You can use it with the combination of runGuardsAndResolvers to rerun resolvers

Leave the router untouched

  • Pass a refresh queryParam with the current timestamp in the URL and subscribe to queryParams in your routed component.
  • Use the activate Event of the router-outlet to get a hold of the routed component.

I have written a more detailed explanation under https://medium.com/@kevinkreuzer/refresh-current-route-in-angular-512a19d58f6e

Hope this helps.

Python 'If not' syntax

Yes, if bar is not None is more explicit, and thus better, assuming it is indeed what you want. That's not always the case, there are subtle differences: if not bar: will execute if bar is any kind of zero or empty container, or False. Many people do use not bar where they really do mean bar is not None.

How do I get the height and width of the Android Navigation Bar programmatically?

This is my code to add paddingRight and paddingBottom to a View to dodge the Navigation Bar. I combined some of the answers here and made a special clause for landscape orientation together with isInMultiWindowMode. The key is to read navigation_bar_height, but also check config_showNavigationBar to make sure we should actually use the height.

None of the previous solutions worked for me. As of Android 7.0 you have to take Multi Window Mode into consideration. This breaks the implementations comparing display.realSize with display.size since realSize gives you the dimensions of the whole screen (both split windows) and size only gives you the dimensions of your App window. Setting padding to this difference will leave your whole view being padding.

/** Adds padding to a view to dodge the navigation bar.

    Unfortunately something like this needs to be done since there
    are no attr or dimens value available to get the navigation bar
    height (as of December 2016). */
public static void addNavigationBarPadding(Activity context, View v) {
    Resources resources = context.getResources();
    if (hasNavigationBar(resources)) {
        int orientation = resources.getConfiguration().orientation;
        int size = getNavigationBarSize(resources);
        switch (orientation) {
        case Configuration.ORIENTATION_LANDSCAPE:
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N &&
                context.isInMultiWindowMode()) { break; }
            v.setPadding(v.getPaddingLeft(), v.getPaddingTop(),
                         v.getPaddingRight() + size, v.getPaddingBottom());
            break;
        case Configuration.ORIENTATION_PORTRAIT:
            v.setPadding(v.getPaddingLeft(), v.getPaddingTop(),
                         v.getPaddingRight(), v.getPaddingBottom() + size);
            break;
        }
    }
}

private static int getNavigationBarSize(Resources resources) {
    int resourceId = resources.getIdentifier("navigation_bar_height",
                                             "dimen", "android");
    return resourceId > 0 ? resources.getDimensionPixelSize(resourceId) : 0;
}

private static boolean hasNavigationBar(Resources resources) {
    int hasNavBarId = resources.getIdentifier("config_showNavigationBar",
                                              "bool", "android");
    return hasNavBarId > 0 && resources.getBoolean(hasNavBarId);
}

Bootstrap modal appearing under background

Remove modal-backdrop background which is set to black in your bootstrap CSS

See mine:

.modal-backdrop {
    position: fixed; /*---- commented and it shows */
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1030;
    /*background-color: #000000; */
}

and then add this background color and opacity of o.5. see mine:

.modal-backdrop {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1030; 
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0.5;

}

NOTE: Though these changes were made in the boostrap css, I used angular-strap and I didn't download or use the ng-animate css

Installing tkinter on ubuntu 14.04

Try writing the following in the terminal:

sudo apt-get install python-tk

Don't forget to actually import Tkinter module at the beginning of your program:

import Tkinter

Is there a float input type in HTML5?

<input type="number" step="any">

This worked for me and i think is the easiest way to make the input field accept any decimal number irrespective of how long the decimal part is. Step attribute actually shows the input field how many decimal points should be accepted. E.g, step="0.01" will accept only two decimal points.

Set background colour of cell to RGB value of data in cell

You can use VBA - something like

Range("A1:A6").Interior.Color = RGB(127,187,199)

Just pass in the cell value.

Combine two ActiveRecord::Relation objects

Brute force it:

first_name_relation = User.where(:first_name => 'Tobias') # ActiveRecord::Relation
last_name_relation  = User.where(:last_name  => 'Fünke') # ActiveRecord::Relation

all_name_relations = User.none
first_name_relation.each do |ar|
  all_name_relations.new(ar)
end
last_name_relation.each do |ar|
  all_name_relations.new(ar)
end

ld cannot find -l<library>

I had a similar problem with another library and the reason why it didn't found it, was that I didn't run the make install (after running ./configure and make) for that library. The make install may require root privileges (in this case use: sudo make install). After running the make install you should have the so files in the correct folder, i.e. here /usr/local/lib and not in the folder mentioned by you.

How do I draw a circle in iOS Swift?

A simple function drawing a circle on the middle of your window frame, using a multiplicator percentage

/// CGFloat is a multiplicator from self.view.frame.width
func drawCircle(withMultiplicator coefficient: CGFloat) {

    let radius = self.view.frame.width / 2 * coefficient

    let circlePath = UIBezierPath(arcCenter: self.view.center, radius: radius, startAngle: CGFloat(0), endAngle:CGFloat(Double.pi * 2), clockwise: true)
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = circlePath.cgPath

    //change the fill color
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.strokeColor = UIColor.darkGray.cgColor
    shapeLayer.lineWidth = 2.0

    view.layer.addSublayer(shapeLayer)
}

How to make a variadic macro (variable number of arguments)

I don't think that's possible, you could fake it with double parens ... just as long you don't need the arguments individually.

#define macro(ARGS) some_complicated (whatever ARGS)
// ...
macro((a,b,c))
macro((d,e))

Oracle date format picture ends before converting entire input string

you need to alter session

you can try before insert

 sql : alter session set nls_date_format = 'YYYY-MM-DD HH24:MI:SS'

static function in C

Looking at the posts above I would like to give a more clarified answer:

Suppose our main.c file looks like this:

#include "header.h"

int main(void) {
    FunctionInHeader();
}

Now consider three cases:

  • Case 1: Our header.h file looks like this:

     #include <stdio.h>
    
     static void FunctionInHeader();
    
     void FunctionInHeader() {
         printf("Calling function inside header\n");
     }
    

    Then the following command on linux:

     gcc main.c -o main
    

    will succeed! That's because after the main.c file includes the header.h, the static function definition will be in the same main.c file (more precisely, in the same translation unit) to where it's called.

    If one runs ./main, the output will be Calling function inside header, which is what that static function should print.

  • Case 2: Our header header.h looks like this:

      static void FunctionInHeader();     
    

    and we also have one more file header.c, which looks like this:

      #include <stdio.h>
      #include "header.h"
    
      void FunctionInHeader() {
          printf("Calling function inside header\n");
      }
    

    Then the following command

      gcc main.c header.c -o main
    

    will give an error. In this case main.c includes only the declaration of the static function, but the definition is left in another translation unit and the static keyword prevents the code defining a function to be linked

  • Case 3:

    Similar to case 2, except that now our header header.h file is:

      void FunctionInHeader(); // keyword static removed
    

    Then the same command as in case 2 will succeed, and further executing ./main will give the expected result. Here the FunctionInHeader definition is in another translation unit, but the code defining it can be linked.

Thus, to conclude:

static keyword prevents the code defining a function to be linked,
when that function is defined in another translation unit than where it is called.

Partly cherry-picking a commit with Git

Assuming the changes you want are at the head of the branch you want the changes from, use git checkout

for a single file :

git checkout branch_that_has_the_changes_you_want path/to/file.rb

for multiple files just daisy chain :

git checkout branch_that_has_the_changes_you_want path/to/file.rb path/to/other_file.rb

Does a favicon have to be 32x32 or 16x16?

I am not sure if/how browsers scale large icons, but The W3C suggests the following1:

The format for the image you have chosen must be 16x16 pixels or 32x32 pixels, using either 8-bit or 24-bit colors. The format of the image must be one of PNG (a W3C standard), GIF, or ICO.


1 w3c.org: How to Add a Favicon to your Site (Draft in development).

Converting HTML to Excel?

We copy/paste html pages from our ERP to Excel using "paste special.. as html/unicode" and it works quite well with tables.

In Python, how do I index a list with another list?

L= {'a':'a','d':'d', 'h':'h'}
index= ['a','d','h'] 
for keys in index:
    print(L[keys])

I would use a Dict add desired keys to index

Add one day to date in javascript

Note that Date.getDate only returns the day of the month. You can add a day by calling Date.setDate and appending 1.

// Create new Date instance
var date = new Date()

// Add a day
date.setDate(date.getDate() + 1)

JavaScript will automatically update the month and year for you.

EDIT:
Here's a link to a page where you can find all the cool stuff about the built-in Date object, and see what's possible: Date.