Drop default constraint on a column in TSQL

I would suggest:

DECLARE @sqlStatement nvarchar(MAX),
        @tableName nvarchar(50) = 'TripEvent',
        @columnName nvarchar(50) = 'CreatedDate';

SELECT                  @sqlStatement = 'ALTER TABLE ' + @tableName + ' DROP CONSTRAINT ' + dc.name + ';'
        FROM            sys.default_constraints AS dc
            LEFT JOIN   sys.columns AS sc
                ON      (dc.parent_column_id = sc.column_id)
        WHERE           dc.parent_object_id = OBJECT_ID(@tableName)
        AND         type_desc = 'DEFAULT_CONSTRAINT'
        AND         sc.name = @columnName
PRINT'   ['+@tableName+']:'+@@SERVERNAME+'.'+DB_NAME()+'@'+CONVERT(VarChar, GETDATE(), 127)+';  '+@sqlStatement;
IF(LEN(@sqlStatement)>0)EXEC sp_executesql @sqlStatement

Create XML in Javascript

Your code is referencing this library

You can include it, and then your code in question should run as is. If you want to do this without prepending the library & build it with builtin functions only - follow answer from @Seb3736.

In Browser Example

<html>
<head>
    <script src="Global.js" language="javascript"></script>
    <script src="XMLWriter.js" language="javascript"></script>
    <script language="javascript" type="text/javascript">
        function genXML(){
            var XML = new XMLWriter();
            XML.BeginNode ("testing");
            XML.Node("testingOne");
            XML.Node("TestingTwo");
            XML.Node("TestingThree");
            XML.EndNode();
            //Do something... eg.
            console.log(XML.ToString); //Yes ToString() not toString()
        }
    </script>
</head>
<body>
    <input type="submit" value="genXML" onclick="genXML();">
</body>
</html>

Unsupported method: BaseConfig.getApplicationIdSuffix()

Change your gradle version or update it

dependencies {
    classpath 'com.android.tools.build:gradle:3.0.1'
}

alt+enter and choose "replace with specific version".

How to save local data in a Swift app?

Using NSCoding and NSKeyedArchiver is another great option for data that's too complex for NSUserDefaults, but for which CoreData would be overkill. It also gives you the opportunity to manage the file structure more explicitly, which is great if you want to use encryption.

Mapping US zip code to time zone

This will download a yaml file that will map all timezones to an array of their zipcodes:

curl https://gist.githubusercontent.com/anonymous/01bf19b21da3424f6418/raw/0d69a384f55c6f68244ddaa07e0c2272b44cb1de/timezones_to_zipcodes.yml > timezones_to_zipcodes.yml

e.g.

"Eastern Time (US & Canada)" => ["00100", "00101", "00102", "00103", "00104", ...]
"Central Time (US & Canada)" => ["35000", "35001", "35002", "35003", "35004", ...]
etc...

If you prefer the shortened timezones, you can run this one:

curl https://gist.githubusercontent.com/anonymous/4e04970131ca82945080/raw/e85876daf39a823e54d17a79258b170d0a33dac0/timezones_to_zipcodes_short.yml > timezones_to_zipcodes.yml

e.g.

"EDT" => ["00100", "00101", "00102", "00103", "00104", ...]
"CDT" => ["35000", "35001", "35002", "35003", "35004", ...]
etc...

CSS3 100vh not constant in mobile browser

Because it won't be fixed, you can do something like:

# html
<body>
  <div class="content">
    <!-- Your stuff here -->
  </div>
</body>

# css
.content {
  height: 80vh;
}

For me it was the fastest and more pure solution than playing with the JavaScript which could not work on many devices and browsers.

Just use proper value of vh which fits your needs.

UIButton Image + Text IOS

swift version:

var button = UIButton()

newGameButton.setTitle("????? ????", for: .normal)
newGameButton.setImage(UIImage(named: "energi"), for: .normal)
newGameButton.backgroundColor = .blue
newGameButton.imageEdgeInsets.left = -50

Raise error in a Bash script

Basic error handling

If your test case runner returns a non-zero code for failed tests, you can simply write:

test_handler test_case_x; test_result=$?
if ((test_result != 0)); then
  printf '%s\n' "Test case x failed" >&2  # write error message to stderr
  exit 1                                  # or exit $test_result
fi

Or even shorter:

if ! test_handler test_case_x; then
  printf '%s\n' "Test case x failed" >&2
  exit 1
fi

Or the shortest:

test_handler test_case_x || { printf '%s\n' "Test case x failed" >&2; exit 1; }

To exit with test_handler's exit code:

test_handler test_case_x || { ec=$?; printf '%s\n' "Test case x failed" >&2; exit $ec; }

Advanced error handling

If you want to take a more comprehensive approach, you can have an error handler:

exit_if_error() {
  local exit_code=$1
  shift
  [[ $exit_code ]] &&               # do nothing if no error code passed
    ((exit_code != 0)) && {         # do nothing if error code is 0
      printf 'ERROR: %s\n' "$@" >&2 # we can use better logging here
      exit "$exit_code"             # we could also check to make sure
                                    # error code is numeric when passed
    }
}

then invoke it after running your test case:

run_test_case test_case_x
exit_if_error $? "Test case x failed"

run_test_case test_case_x || exit_if_error $? "Test case x failed"

The advantages of having an error handler like exit_if_error are:

we can standardize all the error handling logic such as logging, printing a stack trace, notification, doing cleanup etc., in one place
by making the error handler get the error code as an argument, we can spare the caller from the clutter of if blocks that test exit codes for errors
if we have a signal handler (using trap), we can invoke the error handler from there

Error handling and logging library

Here is a complete implementation of error handling and logging:

https://github.com/codeforester/base/blob/master/lib/stdlib.sh

Error handling in Bash
The 'caller' builtin command on Bash Hackers Wiki
Are there any standard exit status codes in Linux?
BashFAQ/105 - Why doesn't set -e (or set -o errexit, or trap ERR) do what I expected?
Equivalent of __FILE__, __LINE__ in Bash
Is there a TRY CATCH command in Bash
To add a stack trace to the error handler, you may want to look at this post: Trace of executed programs called by a Bash script
Ignoring specific errors in a shell script
Catching error codes in a shell pipe
How do I manage log verbosity inside a shell script?
How to log function name and line number in Bash?
Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?

Http 415 Unsupported Media type error with JSON

If you are making jquery ajax request, dont forget to add

contentType:'application/json'

How can I check if a string contains a character in C#?

It will be hard to work in C# without knowing how to work with strings and booleans. But anyway:

        String str = "ABC";
        if (str.Contains('A'))
        { 
            //...
        }

        if (str.Contains("AB"))
        { 
            //...
        }

Is it possible to display inline images from html in an Android TextView?

You could also write your own parser to pull the URL of all the images and then dynamically create new imageviews and pass in the urls.

GSON - Date format

As M.L. pointed out, JsonSerializer works here. However, if you are formatting database entities, use java.sql.Date to register you serializer. Deserializer is not needed.

Gson gson = new GsonBuilder()
   .registerTypeAdapter(java.sql.Date.class, ser).create();

This bug report might be related: http://code.google.com/p/google-gson/issues/detail?id=230. I use version 1.7.2 though.

Spring Boot JPA - configuring auto reconnect

In case anyone is using custom DataSource

@Bean(name = "managementDataSource")
@ConfigurationProperties(prefix = "management.datasource")
public DataSource dataSource() {
    return DataSourceBuilder.create().build();
}

Properties should look like the following. Notice the @ConfigurationProperties with prefix. The prefix is everything before the actual property name

management.datasource.test-on-borrow=true
management.datasource.validation-query=SELECT 1

A reference for Spring Version 1.4.4.RELEASE

Convert integer value to matching Java Enum

You will have to make a new static method where you iterate PcapLinkType.values() and compare:

public static PcapLinkType forCode(int code) {
    for (PcapLinkType typ? : PcapLinkType.values()) {
        if (type.getValue() == code) {
            return type;
        }
    }
    return null;
 }

That would be fine if it is called rarely. If it is called frequently, then look at the Map optimization suggested by others.

Docker - Container is not running

First of all, we have to start the docker container

ankit@ankit-HP-Notebook:~$  sudo docker start 3a19b39ea021

                        3a19b39ea021

After that, check the docker container:

ankit@ankit-HP-Notebook:~$  sudo docker ps -a

 CONTAINER ID        IMAGE                         COMMAND             CREATED             STATUS                   PORTS               NAMES

  3a19b39ea021        coreapps/ubuntu16.04:latest   "bash"              13 hours ago        
  Up 9 seconds                                 ubuntu1

  455b66057060        hello-world                   "/hello"            4 weeks ago         

Exited (0) 4 weeks ago                       vigorous_bardeen

Then execute by using the command below:

ankit@ankit-HP-Notebook:~$  sudo docker exec -it 3a19b39ea021 bash

root@3a19b39ea021:/#

Delete specified file from document directory

    NSError *error;
    [[NSFileManager defaultManager] removeItemAtPath:new_file_path_str error:&error];
    if (error){
        NSLog(@"%@", error);
    }

Entity Framework .Remove() vs. .DeleteObject()

It's not generally correct that you can "remove an item from a database" with both methods. To be precise it is like so:

ObjectContext.DeleteObject(entity) marks the entity as Deleted in the context. (It's EntityState is Deleted after that.) If you call SaveChanges afterwards EF sends a SQL DELETE statement to the database. If no referential constraints in the database are violated the entity will be deleted, otherwise an exception is thrown.
EntityCollection.Remove(childEntity) marks the relationship between parent and childEntity as Deleted. If the childEntity itself is deleted from the database and what exactly happens when you call SaveChanges depends on the kind of relationship between the two:
- If the relationship is optional, i.e. the foreign key that refers from the child to the parent in the database allows NULL values, this foreign will be set to null and if you call SaveChanges this NULL value for the childEntity will be written to the database (i.e. the relationship between the two is removed). This happens with a SQL UPDATE statement. No DELETE statement occurs.
- If the relationship is required (the FK doesn't allow NULL values) and the relationship is not identifying (which means that the foreign key is not part of the child's (composite) primary key) you have to either add the child to another parent or you have to explicitly delete the child (with DeleteObject then). If you don't do any of these a referential constraint is violated and EF will throw an exception when you call SaveChanges - the infamous "The relationship could not be changed because one or more of the foreign-key properties is non-nullable" exception or similar.
- If the relationship is identifying (it's necessarily required then because any part of the primary key cannot be NULL) EF will mark the childEntity as Deleted as well. If you call SaveChanges a SQL DELETE statement will be sent to the database. If no other referential constraints in the database are violated the entity will be deleted, otherwise an exception is thrown.

I am actually a bit confused about the Remarks section on the MSDN page you have linked because it says: "If the relationship has a referential integrity constraint, calling the Remove method on a dependent object marks both the relationship and the dependent object for deletion.". This seems unprecise or even wrong to me because all three cases above have a "referential integrity constraint" but only in the last case the child is in fact deleted. (Unless they mean with "dependent object" an object that participates in an identifying relationship which would be an unusual terminology though.)

Propagate all arguments in a bash shell script

Use "$@" instead of plain $@ if you actually wish your parameters to be passed the same.

Observe:

$ cat no_quotes.sh
#!/bin/bash
echo_args.sh $@

$ cat quotes.sh
#!/bin/bash
echo_args.sh "$@"

$ cat echo_args.sh
#!/bin/bash
echo Received: $1
echo Received: $2
echo Received: $3
echo Received: $4

$ ./no_quotes.sh first second
Received: first
Received: second
Received:
Received:

$ ./no_quotes.sh "one quoted arg"
Received: one
Received: quoted
Received: arg
Received:

$ ./quotes.sh first second
Received: first
Received: second
Received:
Received:

$ ./quotes.sh "one quoted arg"
Received: one quoted arg
Received:
Received:
Received:

AngularJS $watch window resize inside directive

You shouldn't need a $watch. Just bind to resize event on window:

DEMO

'use strict';

var app = angular.module('plunker', []);

app.directive('myDirective', ['$window', function ($window) {

     return {
        link: link,
        restrict: 'E',
        template: '<div>window size: {{width}}px</div>'
     };

     function link(scope, element, attrs){

       scope.width = $window.innerWidth;

       angular.element($window).bind('resize', function(){

         scope.width = $window.innerWidth;

         // manuall $digest required as resize event
         // is outside of angular
         scope.$digest();
       });

     }

 }]);

100% width background image with an 'auto' height

Tim S. was much closer to a "correct" answer then the currently accepted one. If you want to have a 100% width, variable height background image done with CSS, instead of using cover (which will allow the image to extend out from the sides) or contain (which does not allow the image to extend out at all), just set the CSS like so:

body {
    background-image: url(img.jpg);
    background-position: center top;
    background-size: 100% auto;
}

This will set your background image to 100% width and allow the height to overflow. Now you can use media queries to swap out that image instead of relying on JavaScript.

EDIT: I just realized (3 months later) that you probably don't want the image to overflow; you seem to want the container element to resize based on it's background-image (to preserve it's aspect ratio), which is not possible with CSS as far as I know.

Hopefully soon you'll be able to use the new srcset attribute on the img element. If you want to use img elements now, the currently accepted answer is probably best.

However, you can create a responsive background-image element with a constant aspect ratio using purely CSS. To do this, you set the height to 0 and set the padding-bottom to a percentage of the element's own width, like so:

.foo {
    height: 0;
    padding: 0; /* remove any pre-existing padding, just in case */
    padding-bottom: 75%; /* for a 4:3 aspect ratio */
    background-image: url(foo.png);
    background-position: center center;
    background-size: 100%;
    background-repeat: no-repeat;
}

In order to use different aspect ratios, divide the height of the original image by it's own width, and multiply by 100 to get the percentage value. This works because padding percentage is always calculated based on width, even if it's vertical padding.

How to ping an IP address

InetAddress.isReachable() according to javadoc:

".. A typical implementation will use ICMP ECHO REQUESTs if the privilege can be obtained, otherwise it will try to establish a TCP connection on port 7 (Echo) of the destination host..".

Option #1 (ICMP) usually requires administrative (root) rights.

Can I use Objective-C blocks as properties?

@property (nonatomic, copy) void (^simpleBlock)(void);
@property (nonatomic, copy) BOOL (^blockWithParamter)(NSString *input);

If you are going to be repeating the same block in several places use a type def

typedef void(^MyCompletionBlock)(BOOL success, NSError *error);
@property (nonatomic) MyCompletionBlock completion;

Safest way to run BAT file from Powershell script

try running after changing file name from '-' to `_'

for eg: .\my_app\my_fle.bat

instead of .\\my-app\my-fle.bat

cd my_app  
 .\my_file.bat

Excel Formula which places date/time in cell when data is entered in another cell in the same row

This can be accomplished with a simple VBA function. Excel has support for a Worksheet Change Sub which can be programmed to put a date in a related column every time it fires.

Private Sub Worksheet_Change(ByVal Target As Range)
    If Target.Column = 2 And Target.Offset(0, 3).Value = "" Then
        Target.Offset(0, 3) = Format(Now(), "HH:MM:SS")
    End If
End Sub

A quick explanation. The following "if" statement checks for two things: (1) if it is the second column that changed (Column B), and (2) if the cell 3 columns over (Column E) is currently empty.

If Target.Column = 2 And Target.Offset(0, 3).Value = "" Then

If both conditions are true, then it puts the date into the cell in Column E with the NOW() function.

Target.Offset(0, 3) = Format(Now(), "HH:MM:SS")

Range.Offset

Range.Column

Cannot find vcvarsall.bat when running a Python script

This cryptic error means that you don't have a C compiler installed. There was a discussion to propose a more explanative error (which is continued here, register and comment if you care about it!) but currently it is still not implemented.

To fix this issue you can either install the Visual Studio 2008 SDK which will take about a GB, or you can install the very small VCForPython27.msi but which is not well supported by distutils currently, here's the procedure:

1) install Microsoft Visual C++ Compiler for Python 2.7 from
http://www.microsoft.com/en-us/download/details.aspx?id=44266
2) Enter MSVC for Python command prompt
3) SET DISTUTILS_USE_SDK=1
4) SET MSSdk=1
5) you can then build your C extensions: python.exe setup.py ...

Steps 2 to 4 must be reproduced everytime before building your C extensions. This is because of an issue with the VCForPython27.msi which install the header files and vcvarsall.bat in folders of a different layout than the VS2008 SDK and thus confuse the compiler detection of distutils. This will get fixed in setuptools in Python 2.7.10.

Bug report and workaround by Gregory Szorc: http://bugs.python.org/issue23246

More info and a workaround for using %%cython magic inside IPython: https://github.com/cython/cython/wiki/CythonExtensionsOnWindows

/EDIT: Also, if you have another version of Python, you cannot use Microsoft Visual C++ for Python 2.7, which is a kind of mini-compiler specifically made by Microsoft for Python 2.7. In this case, you need to install the Visual Studio SDK that match your Python version, or a Windows SDK with the correct NET framework version. See here for more infos: https://github.com/cython/cython/wiki/CythonExtensionsOnWindows#using-windows-sdk-cc-compiler-works-for-all-python-versions

nginx - read custom header from upstream server

I was facing the same issue. I tried both $http_my_custom_header and $sent_http_my_custom_header but it did not work for me.

Although solved this issue by using $upstream_http_my_custom_header.

Sql server - log is full due to ACTIVE_TRANSACTION

Restarting the SQL Server will clear up the log space used by your database. If this however is not an option, you can try the following:

* Issue a CHECKPOINT command to free up log space in the log file.

* Check the available log space with DBCC SQLPERF('logspace'). If only a small 
  percentage of your log file is actually been used, you can try a DBCC SHRINKFILE 
  command. This can however possibly introduce corruption in your database. 

* If you have another drive with space available you can try to add a file there in 
  order to get enough space to attempt to resolve the issue.

Hope this will help you in finding your solution.

How to add url parameter to the current url?

function currentUrl() {
    $protocol = strpos(strtolower($_SERVER['SERVER_PROTOCOL']),'https') === FALSE ? 'http' : 'https';
    $host     = $_SERVER['HTTP_HOST'];
    $script   = $_SERVER['SCRIPT_NAME'];
    $params   = $_SERVER['QUERY_STRING'];

    return $protocol . '://' . $host . $script . '?' . $params;
}

Then add your value with something like;

echo currentUrl().'&value=myVal';

How to auto adjust table td width from the content

Use this style attribute for no word wrapping:

white-space: nowrap;

CSS animation delay in repeating

I made a poster on the wall which moves left and right with intervals. For me it works:

.div-animation {
   -webkit-animation: bounce 2000ms ease-out;
    -moz-animation: bounce 2000ms ease-out;
    -o-animation: bounce 2000ms ease-out;
    animation: bounce 2000ms ease-out infinite;
    -webkit-animation-delay: 2s; /* Chrome, Safari, Opera */
    animation-delay: 2s;
    transform-origin: 55% 10%;    
}

@-webkit-keyframes bounce {
    0% {
        transform: rotate(0deg);
    }
    3% {
        transform: rotate(1deg);
    }
    6% {
        transform: rotate(2deg);
    }
    9% {
        transform: rotate(3deg);
    }
    12% {
        transform: rotate(2deg);
    }
    15% {
        transform: rotate(1deg);
    }
    18% {
        transform: rotate(0deg);
    }
    21% {
        transform: rotate(-1deg);
    }
    24% {
        transform: rotate(-2deg);
    }
    27% {
        transform: rotate(-3deg);
    }
    30% {
        transform: rotate(-2deg);
    }
    33% {
        transform: rotate(-1deg);
    }
    36% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(0deg);
    }
}

window.onload vs document.onload

When do they fire?

window.onload

By default, it is fired when the entire page loads, including its content (images, CSS, scripts, etc.).

In some browsers it now takes over the role of document.onload and fires when the DOM is ready as well.

document.onload

It is called when the DOM is ready which can be prior to images and other external content is loaded.

How well are they supported?

window.onload appears to be the most widely supported. In fact, some of the most modern browsers have in a sense replaced document.onload with window.onload.

Browser support issues are most likely the reason why many people are starting to use libraries such as jQuery to handle the checking for the document being ready, like so:

$(document).ready(function() { /* code here */ });
$(function() { /* code here */ });

For the purpose of history. window.onload vs body.onload:

A similar question was asked on codingforums a while back regarding the usage of window.onload over body.onload. The result seemed to be that you should use window.onload because it is good to separate your structure from the action.

Is String.Contains() faster than String.IndexOf()?

Probably, it will not matter at all. Read this post on Coding Horror ;): http://www.codinghorror.com/blog/archives/001218.html

UIView's frame, bounds, center, origin, when to use what?

Marco's answer above is correct, but just to expand on the question of "under what context"...

frame - this is the property you most often use for normal iPhone applications. most controls will be laid out relative to the "containing" control so the frame.origin will directly correspond to where the control needs to display, and frame.size will determine how big to make the control.

center - this is the property you will likely focus on for sprite based games and animations where movement or scaling may occur. By default animation and rotation will be based on the center of the UIView. It rarely makes sense to try and manage such objects by the frame property.

bounds - this property is not a positioning property, but defines the drawable area of the UIView "relative" to the frame. By default this property is usually (0, 0, width, height). Changing this property will allow you to draw outside of the frame or restrict drawing to a smaller area within the frame. A good discussion of this can be found at the link below. It is uncommon for this property to be manipulated unless there is specific need to adjust the drawing region. The only exception is that most programs will use the [[UIScreen mainScreen] bounds] on startup to determine the visible area for the application and setup their initial UIView's frame accordingly.

Why is there an frame rectangle and an bounds rectangle in an UIView?

Hopefully this helps clarify the circumstances where each property might get used.

How can I force component to re-render with hooks in React?

This will render depending components 3 times (arrays with equal elements aren't equal):

const [msg, setMsg] = useState([""])

setMsg(["test"])
setMsg(["test"])
setMsg(["test"])

Best way to import Observable from rxjs

Update for RxJS 6 (April 2018)

It is now perfectly fine to import directly from rxjs. (As can be seen in Angular 6+). Importing from rxjs/operators is also fine and it is actually no longer possible to import operators globally (one of major reasons for refactoring rxjs 6 and the new approach using pipe). Thanks to this treeshaking can now be used as well.

Sample code from rxjs repo:

import { Observable, Subject, ReplaySubject, from, of, range } from 'rxjs';
import { map, filter, switchMap } from 'rxjs/operators';

range(1, 200)
  .pipe(filter(x => x % 2 === 1), map(x => x + x))
  .subscribe(x => console.log(x));

Backwards compatibility for rxjs < 6?

rxjs team released a compatibility package on npm that is pretty much install & play. With this all your rxjs 5.x code should run without any issues. This is especially useful now when most of the dependencies (i.e. modules for Angular) are not yet updated.

Jersey Exception : SEVERE: A message body reader for Java class

I was able to fix the issue by adding the maven dependency for jersey-json.

How to write a caption under an image?

<table>
<tr><td><img ...><td><img ...>
<tr><td>caption1<td>caption2
</table>

Style as desired.

Set default heap size in Windows

Setup JAVA_OPTS as a system variable with the following content:

JAVA_OPTS="-Xms256m -Xmx512m"

After that in a command prompt run the following commands:

SET JAVA_OPTS="-Xms256m -Xmx512m"

This can be explained as follows:

allocate at minimum 256MBs of heap
allocate at maximum 512MBs of heap

These values should be changed according to application requirements.

EDIT:

You can also try adding it through the Environment Properties menu which can be found at:

From the Desktop, right-click My Computer and click Properties.
Click Advanced System Settings link in the left column.
In the System Properties window click the Environment Variables button.
Click New to add a new variable name and value.
For variable name enter JAVA_OPTS for variable value enter -Xms256m -Xmx512m
Click ok and close the System Properties Tab.
Restart any java applications.

EDIT 2:

JAVA_OPTS is a system variable that stores various settings/configurations for your local Java Virtual Machine. By having JAVA_OPTS set as a system variable all applications running on top of the JVM will take their settings from this parameter.

To setup a system variable you have to complete the steps listed above from 1 to 4.

How to check a string against null in java?

Of course user351809, stringname.equalsignorecase(null) will throw NullPointerException.
See, you have a string object stringname, which follows 2 possible conditions:-

stringname has a some non-null string value (say "computer"):
Your code will work fine as it takes the form
"computer".equalsignorecase(null)
and you get the expected response as false.
stringname has a null value:
Here your code will get stuck, as
null.equalsignorecase(null)
However, seems good at first look and you may hope response as true,
but, null is not an object that can execute the equalsignorecase() method.

Hence, you get the exception due to case 2.
What I suggest you is to simply use stringname == null

Installed SSL certificate in certificate store, but it's not in IIS certificate list

If you are using Godaddy as your certificate authority, and you are running into this issue; All you have to do is Re-key the certificate. I tried the above certutil -repairstore my "paste the serial # in here" but the system wanted me to use smart card for authentication. (Running IIS10 on Server 2016 and 2012R2)

When I Created a Certificate Request, gone through the process of Re-keying and gone through the process of "Complete Certificate Request" I was able to sucessfuly configure "Bindings..." without the certificate disappearing.

How to parse XML and count instances of a particular node attribute?

#If the xml is in the form of a string as shown below then
from lxml  import etree, objectify
'''sample xml as a string with a name space {http://xmlns.abc.com}'''
message =b'<?xml version="1.0" encoding="UTF-8"?>\r\n<pa:Process xmlns:pa="http://xmlns.abc.com">\r\n\t<pa:firsttag>SAMPLE</pa:firsttag></pa:Process>\r\n'  # this is a sample xml which is a string


print('************message coversion and parsing starts*************')

message=message.decode('utf-8') 
message=message.replace('<?xml version="1.0" encoding="UTF-8"?>\r\n','') #replace is used to remove unwanted strings from the 'message'
message=message.replace('pa:Process>\r\n','pa:Process>')
print (message)

print ('******Parsing starts*************')
parser = etree.XMLParser(remove_blank_text=True) #the name space is removed here
root = etree.fromstring(message, parser) #parsing of xml happens here
print ('******Parsing completed************')


dict={}
for child in root: # parsed xml is iterated using a for loop and values are stored in a dictionary
    print(child.tag,child.text)
    print('****Derving from xml tree*****')
    if child.tag =="{http://xmlns.abc.com}firsttag":
        dict["FIRST_TAG"]=child.text
        print(dict)


### output
'''************message coversion and parsing starts*************
<pa:Process xmlns:pa="http://xmlns.abc.com">

    <pa:firsttag>SAMPLE</pa:firsttag></pa:Process>
******Parsing starts*************
******Parsing completed************
{http://xmlns.abc.com}firsttag SAMPLE
****Derving from xml tree*****
{'FIRST_TAG': 'SAMPLE'}'''

Passing arrays as parameters in bash

My short answer is:

_x000D_

function display_two_array {_x000D_
    local arr1=$1_x000D_
    local arr2=$2_x000D_
    for i in $arr1_x000D_
    do_x000D_
       "arrary1: $i"_x000D_
    done_x000D_
    _x000D_
    for i in $arr2_x000D_
    do_x000D_
       "arrary2: $i"_x000D_
    done_x000D_
}_x000D_
_x000D_
test_array=(1 2 3 4 5)_x000D_
test_array2=(7 8 9 10 11)_x000D_
_x000D_
display_two_array "${test_array[*]}" "${test_array2[*]}"

_x000D_

_x000D_ It should be noticed that the ${test_array[*]} and ${test_array2[*]} should be surrounded by "", otherwise you'll fail.

Random / noise functions for GLSL

Gustavson's implementation uses a 1D texture

No it doesn't, not since 2005. It's just that people insist on downloading the old version. The version that is on the link you supplied uses only 8-bit 2D textures.

The new version by Ian McEwan of Ashima and myself does not use a texture, but runs at around half the speed on typical desktop platforms with lots of texture bandwidth. On mobile platforms, the textureless version might be faster because texturing is often a significant bottleneck.

Our actively maintained source repository is:

https://github.com/ashima/webgl-noise

A collection of both the textureless and texture-using versions of noise is here (using only 2D textures):

http://www.itn.liu.se/~stegu/simplexnoise/GLSL-noise-vs-noise.zip

If you have any specific questions, feel free to e-mail me directly (my email address can be found in the classicnoise*.glsl sources.)

Base64 length calculation?

While everyone else is debating algebraic formulas, I'd rather just use BASE64 itself to tell me:

$ echo "Including padding, a base64 string requires four bytes for every three-byte chunk of the original string, including any partial chunks. One or two bytes extra at the end of the string will still get converted to four bytes in the base64 string when padding is added. Unless you have a very specific use, it is best to add the padding, usually an equals character. I added an extra byte for a null character in C, because ASCII strings without this are a little dangerous and you'd need to carry the string length separately."| wc -c

525

$ echo "Including padding, a base64 string requires four bytes for every three-byte chunk of the original string, including any partial chunks. One or two bytes extra at the end of the string will still get converted to four bytes in the base64 string when padding is added. Unless you have a very specific use, it is best to add the padding, usually an equals character. I added an extra byte for a null character in C, because ASCII strings without this are a little dangerous and you'd need to carry the string length separately." | base64 | wc -c

710

So it seems the formula of 3 bytes being represented by 4 base64 characters seems correct.

initializing a boolean array in java

I just need to initialize all the array elements to Boolean false.

Either use boolean[] instead so that all values defaults to false:

boolean[] array = new boolean[size];

Or use Arrays#fill() to fill the entire array with Boolean.FALSE:

Boolean[] array = new Boolean[size];
Arrays.fill(array, Boolean.FALSE);

Also note that the array index is zero based. The freq[Global.iParameter[2]] = false; line as you've there would cause ArrayIndexOutOfBoundsException. To learn more about arrays in Java, consult this basic Oracle tutorial.

Can I animate absolute positioned element with CSS transition?

Please Try this code margin-left:60px instead of left:60px

please take a look: http://jsfiddle.net/hbirjand/2LtBh/2/

as @Shomz said,transition must be changed to transition:margin 1s linear; instead of transition:all 1s linear;

Tooltip with HTML content without JavaScript

Another similar way to do it by css:

_x000D_

#img {  }_x000D_
#img:hover {visibility:hidden}_x000D_
#thistext {font-size:22px;color:white }_x000D_
#thistext:hover {color:black;}_x000D_
#hoverme {width:50px;height:50px;}_x000D_
_x000D_
#hoverme:hover { _x000D_
background-color:green;_x000D_
position:absolute ;_x000D_
left:300px;_x000D_
top:100px;_x000D_
width:40%;_x000D_
height:20%;_x000D_
}

_x000D_

<p id="hoverme"><img id="img" src="http://a.deviantart.net/avatars/l/o/lol-cat.jpg"></img><span id="thistext">LOCATZ!!!!</span></p>

_x000D_

Try it: http://jsfiddle.net/FdBu7/

And here is some links about transitions and new ways to do it: http://www.w3schools.com/css3/css3_transitions.asp http://dev.opera.com/articles/view/css3-show-and-hide/

What is the difference between using constructor vs getInitialState in React / React Native?

These days we don't have to call the constructor inside the component - we can directly call state={something:""}, otherwise previously first we have do declare constructor with super() to inherit every thing from React.Component class then inside constructor we initialize our state.

If using React.createClass then define initialize state with the getInitialState method.

The target principal name is incorrect. Cannot generate SSPI context

I have tried all the solutions here and none of them have worked yet. A workaround that is working is to Click Connect, enter the server name, select Options, Connection Properties tab. Set the "Network protocol" to "Named Pipes". This allows users to remote connect using their network credentials. I'll post an update when I get a fix.

How do I get a reference to the app delegate in Swift?

In Swift 3.0 you can get the appdelegate reference by

let appDelegate = UIApplication.shared.delegate as! AppDelegate

Jasmine JavaScript Testing - toBe vs toEqual

Thought someone might like explanation by (annotated) example:

Below, if my deepClone() function does its job right, the test (as described in the 'it()' call) will succeed:

describe('deepClone() array copy', ()=>{
    let source:any = {}
    let clone:any = source
    beforeAll(()=>{
        source.a = [1,'string literal',{x:10, obj:{y:4}}]
        clone = Utils.deepClone(source) // THE CLONING ACT TO BE TESTED - lets see it it does it right.
    })
    it('should create a clone which has unique identity, but equal values as the source object',()=>{
        expect(source !== clone).toBe(true) // If we have different object instances...
        expect(source).not.toBe(clone) // <= synonymous to the above. Will fail if: you remove the '.not', and if: the two being compared are indeed different objects.
        expect(source).toEqual(clone) // ...that hold same values, all tests will succeed.
    })
})

Of course this is not a complete test suite for my deepClone(), as I haven't tested here if the object literal in the array (and the one nested therein) also have distinct identity but same values.

'Static readonly' vs. 'const'

A static readonly field is advantageous when exposing to other assemblies a value that might change in a later version.

For instance, suppose assembly X exposes a constant as follows:

public const decimal ProgramVersion = 2.3;

If assembly Y references X and uses this constant, the value 2.3 will be baked into assembly Y when compiled. This means that if X is later recompiled with the constant set to 2.4, Y will still use the old value of 2.3 until Y is recompiled. A static readonly field avoids this problem.

Another way of looking at this is that any value that might change in the future is not constant by definition, and so should not be represented as one.

facebook: permanent Page Access Token?

Thanks to @donut I managed to get the never expiring access token in JavaScript.

// Initialize exchange
fetch('https://graph.facebook.com/v3.2/oauth/access_token?grant_type=fb_exchange_token&client_id={client_id}&client_secret={client_secret}&fb_exchange_token={short_lived_token}')
.then((data) => {
    return data.json();
})
.then((json) => {
    // Get the user data
    fetch(`https://graph.facebook.com/v3.2/me?access_token=${json.access_token}`)
    .then((data) => {
        return data.json();
    })
    .then((userData) => {
        // Get the page token
        fetch(`https://graph.facebook.com/v3.2/${userData.id}/accounts?access_token=${json.access_token}`)
        .then((data) => {
            return data.json();
        })
        .then((pageToken) => {
            // Save the access token somewhere
            // You'll need it at later point
        })
        .catch((err) => console.error(err))
    })
    .catch((err) => console.error(err))
})
.catch((err) => {
    console.error(err);
})

and then I used the saved access token like this

fetch('https://graph.facebook.com/v3.2/{page_id}?fields=fan_count&access_token={token_from_the_data_array}')
.then((data) => {
    return data.json();
})
.then((json) => {
    // Do stuff
})
.catch((err) => console.error(err))

I hope that someone can trim this code because it's kinda messy but it was the only way I could think of.

How can I detect when an Android application is running in the emulator?

Checking the answers, none of them worked when using LeapDroid, Droid4x or Andy emulators,

What does work for all cases is the following:

 private static String getSystemProperty(String name) throws Exception {
    Class systemPropertyClazz = Class.forName("android.os.SystemProperties");
    return (String) systemPropertyClazz.getMethod("get", new Class[]{String.class}).invoke(systemPropertyClazz, new Object[]{name});
}

public boolean isEmulator() {
    boolean goldfish = getSystemProperty("ro.hardware").contains("goldfish");
    boolean emu = getSystemProperty("ro.kernel.qemu").length() > 0;
    boolean sdk = getSystemProperty("ro.product.model").equals("sdk");
    return goldfish || emu || sdk;
}

Count lines in large files

If your bottleneck is the disk, it matters how you read from it. dd if=filename bs=128M | wc -l is a lot faster than wc -l filename or cat filename | wc -l for my machine that has an HDD and fast CPU and RAM. You can play around with the block size and see what dd reports as the throughput. I cranked it up to 1GiB.

Note: There is some debate about whether cat or dd is faster. All I claim is that dd can be faster, depending on the system, and that it is for me. Try it for yourself.

Webview load html from assets directory

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        WebView wb = new WebView(this);
        wb.loadUrl("file:///android_asset/index.html");
        setContentView(wb);
    }


keep your .html in `asset` folder

Convert string to Date in java

SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
String dateInString = "07/06/2013";

try {

    Date date = formatter.parse(dateInString);
    System.out.println(date);
    System.out.println(formatter.format(date));

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

Output:

2014/08/06 16:06:54
2014/08/06 16:06:54

Controlling Maven final name of jar artifact

You set the finalName property in the plugin configuration section:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.3.2</version>
    <configuration>
        <finalName>myJar</finalName>                   
    </configuration>
</plugin>

As indicated in the official documentation.

Update:

For Maven >= 3

Based on Matthew's comment you can now do it like this:

 <packaging>jar</packaging>
 <build>
   <finalName>WhatEverYouLikey</finalName>
 </build>

See bug report/documentation.

Delaying a jquery script until everything else has loaded

This code block solve my problem,

_x000D_

<script type="text/javascript">_x000D_
  $(window).bind("load", function () {_x000D_
    // Code here_x000D_
  });_x000D_
</script>

_x000D_

Adding close button in div to close the box

Most simple way (assumed you want to remove the element)

<span id='close' onclick='this.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode); return false;'>x</span>

Add this inside your div, an example here.

You may also use something like this

window.onload = function(){
    document.getElementById('close').onclick = function(){
        this.parentNode.parentNode.parentNode
        .removeChild(this.parentNode.parentNode);
        return false;
    };
};

An Example Here.

Css for close button

#close {
    float:right;
    display:inline-block;
    padding:2px 5px;
    background:#ccc;
}

You may add a hover effect like

#close:hover {
    float:right;
    display:inline-block;
    padding:2px 5px;
    background:#ccc;
    color:#fff;
}

Something like this one.

javax.net.ssl.SSLException: Read error: ssl=0x9524b800: I/O error during system call, Connection reset by peer

we had this same issue starting this morning and goti it solved... hope this helps...

SSL on IIS 8

Everything was working fine yesterday and last night our SSL was updated on the IIS site.
While checking out the site Bindings to the SSL noticed that IIS8 has a new checkbox Require Server Name Indication, it was not checked so preceded to enable it.
That triggered the problem.
Went back to IIS, disabled the checkbox.... Problem Solved!!!!

Hope this helps!!!

How to set the env variable for PHP?

It depends on your OS, but if you are on Windows XP, you need to go to Systems Properties, then Advanced, then Environment Variables, and include the php binary path to the %PATH% variable.

Locate it by browsing your WAMP directory. It's called php.exe

Calling variable defined inside one function from another function

def oneFunction(lists):
    category=random.choice(list(lists.keys()))
    word=random.choice(lists[category])
    return word

def anotherFunction():
    for letter in word:             
        print("_",end=" ")

How to update Python?

Official Python .msi installers are designed to replace:
- any previous micro release (in x.y.z, z is "micro") because they are guaranteed to be backward-compatible and binary-compatible
- a "snapshot" (built from source) installation with any micro version
A snapshot installer is designed to replace any snapshot with a lower micro version.

(See responsible code for 2.x, for 3.x)

Any other versions are not necessarily compatible and are thus installed alongside the existing one. If you wish to uninstall the old version, you'll need to do that manually. And also uninstall any 3rd-party modules you had for it:

If you installed any modules from bdist_wininst packages (Windows .exes), uninstall them before uninstalling the version, or the uninstaller might not work correctly if it has custom logic
modules installed with setuptools/pip that reside in Lib\site-packages can just be deleted afterwards
packages that you installed per-user, if any, reside in %APPDATA%/Python/PythonXY/site-packages and can likewise be deleted

Using Enum values as String literals

You can't. I think you have FOUR options here. All four offer a solution but with a slightly different approach...

Option One: use the built-in name() on an enum. This is perfectly fine if you don't need any special naming format.

    String name = Modes.mode1.name(); // Returns the name of this enum constant, exactly as declared in its enum declaration.

Option Two: add overriding properties to your enums if you want more control

public enum Modes {
    mode1 ("Fancy Mode 1"),
    mode2 ("Fancy Mode 2"),
    mode3 ("Fancy Mode 3");

    private final String name;       

    private Modes(String s) {
        name = s;
    }

    public boolean equalsName(String otherName) {
        // (otherName == null) check is not needed because name.equals(null) returns false 
        return name.equals(otherName);
    }

    public String toString() {
       return this.name;
    }
}

Option Three: use static finals instead of enums:

public final class Modes {

    public static final String MODE_1 = "Fancy Mode 1";
    public static final String MODE_2 = "Fancy Mode 2";
    public static final String MODE_3 = "Fancy Mode 3";

    private Modes() { }
}

Option Four: interfaces have every field public, static and final:

public interface Modes {

    String MODE_1 = "Fancy Mode 1";
    String MODE_2 = "Fancy Mode 2";
    String MODE_3 = "Fancy Mode 3";  
}

Python's time.clock() vs. time.time() accuracy?

The difference is very platform-specific.

clock() is very different on Windows than on Linux, for example.

For the sort of examples you describe, you probably want the "timeit" module instead.

WPF Data Binding and Validation Rules Best Practices

From MS's Patterns & Practices documentation:

Data Validation and Error Reporting

Your view model or model will often be required to perform data validation and to signal any data validation errors to the view so that the user can act to correct them.

Silverlight and WPF provide support for managing data validation errors that occur when changing individual properties that are bound to controls in the view. For single properties that are data-bound to a control, the view model or model can signal a data validation error within the property setter by rejecting an incoming bad value and throwing an exception. If the ValidatesOnExceptions property on the data binding is true, the data binding engine in WPF and Silverlight will handle the exception and display a visual cue to the user that there is a data validation error.

However, throwing exceptions with properties in this way should be avoided where possible. An alternative approach is to implement the IDataErrorInfo or INotifyDataErrorInfo interfaces on your view model or model classes. These interfaces allow your view model or model to perform data validation for one or more property values and to return an error message to the view so that the user can be notified of the error.

The documentation goes on to explain how to implement IDataErrorInfo and INotifyDataErrorInfo.

How to prettyprint a JSON file?

Hopefully this helps someone else.

In the case when there is a error that something is not json serializable the answers above will not work. If you only want to save it so that is human readable then you need to recursively call string on all the non dictionary elements of your dictionary. If you want to load it later then save it as a pickle file then load it (e.g. torch.save(obj, f) works fine).

This is what worked for me:

#%%

def _to_json_dict_with_strings(dictionary):
    """
    Convert dict to dict with leafs only being strings. So it recursively makes keys to strings
    if they are not dictionaries.

    Use case:
        - saving dictionary of tensors (convert the tensors to strins!)
        - saving arguments from script (e.g. argparse) for it to be pretty

    e.g.

    """
    if type(dictionary) != dict:
        return str(dictionary)
    d = {k: _to_json_dict_with_strings(v) for k, v in dictionary.items()}
    return d

def to_json(dic):
    import types
    import argparse

    if type(dic) is dict:
        dic = dict(dic)
    else:
        dic = dic.__dict__
    return _to_json_dict_with_strings(dic)

def save_to_json_pretty(dic, path, mode='w', indent=4, sort_keys=True):
    import json

    with open(path, mode) as f:
        json.dump(to_json(dic), f, indent=indent, sort_keys=sort_keys)

def my_pprint(dic):
    """

    @param dic:
    @return:

    Note: this is not the same as pprint.
    """
    import json

    # make all keys strings recursively with their naitve str function
    dic = to_json(dic)
    # pretty print
    pretty_dic = json.dumps(dic, indent=4, sort_keys=True)
    print(pretty_dic)
    # print(json.dumps(dic, indent=4, sort_keys=True))
    # return pretty_dic

import torch
# import json  # results in non serializabe errors for torch.Tensors
from pprint import pprint

dic = {'x': torch.randn(1, 3), 'rec': {'y': torch.randn(1, 3)}}

my_pprint(dic)
pprint(dic)

output:

{
    "rec": {
        "y": "tensor([[-0.3137,  0.3138,  1.2894]])"
    },
    "x": "tensor([[-1.5909,  0.0516, -1.5445]])"
}
{'rec': {'y': tensor([[-0.3137,  0.3138,  1.2894]])},
 'x': tensor([[-1.5909,  0.0516, -1.5445]])}

I don't know why returning the string then printing it doesn't work but it seems you have to put the dumps directly in the print statement. Note pprint as it has been suggested already works too. Note not all objects can be converted to a dict with dict(dic) which is why some of my code has checks on this condition.

Context:

I wanted to save pytorch strings but I kept getting the error:

TypeError: tensor is not JSON serializable

so I coded the above. Note that yes, in pytorch you use torch.save but pickle files aren't readable. Check this related post: https://discuss.pytorch.org/t/typeerror-tensor-is-not-json-serializable/36065/3

PPrint also has indent arguments but I didn't like how it looks:

    pprint(stats, indent=4, sort_dicts=True)

output:

{   'cca': {   'all': {'avg': tensor(0.5132), 'std': tensor(0.1532)},
               'avg': tensor([0.5993, 0.5571, 0.4910, 0.4053]),
               'rep': {'avg': tensor(0.5491), 'std': tensor(0.0743)},
               'std': tensor([0.0316, 0.0368, 0.0910, 0.2490])},
    'cka': {   'all': {'avg': tensor(0.7885), 'std': tensor(0.3449)},
               'avg': tensor([1.0000, 0.9840, 0.9442, 0.2260]),
               'rep': {'avg': tensor(0.9761), 'std': tensor(0.0468)},
               'std': tensor([5.9043e-07, 2.9688e-02, 6.3634e-02, 2.1686e-01])},
    'cosine': {   'all': {'avg': tensor(0.5931), 'std': tensor(0.7158)},
                  'avg': tensor([ 0.9825,  0.9001,  0.7909, -0.3012]),
                  'rep': {'avg': tensor(0.8912), 'std': tensor(0.1571)},
                  'std': tensor([0.0371, 0.1232, 0.1976, 0.9536])},
    'nes': {   'all': {'avg': tensor(0.6771), 'std': tensor(0.2891)},
               'avg': tensor([0.9326, 0.8038, 0.6852, 0.2867]),
               'rep': {'avg': tensor(0.8072), 'std': tensor(0.1596)},
               'std': tensor([0.0695, 0.1266, 0.1578, 0.2339])},
    'nes_output': {   'all': {'avg': None, 'std': None},
                      'avg': tensor(0.2975),
                      'rep': {'avg': None, 'std': None},
                      'std': tensor(0.0945)},
    'query_loss': {   'all': {'avg': None, 'std': None},
                      'avg': tensor(12.3746),
                      'rep': {'avg': None, 'std': None},
                      'std': tensor(13.7910)}}

compare to:

{
    "cca": {
        "all": {
            "avg": "tensor(0.5144)",
            "std": "tensor(0.1553)"
        },
        "avg": "tensor([0.6023, 0.5612, 0.4874, 0.4066])",
        "rep": {
            "avg": "tensor(0.5503)",
            "std": "tensor(0.0796)"
        },
        "std": "tensor([0.0285, 0.0367, 0.1004, 0.2493])"
    },
    "cka": {
        "all": {
            "avg": "tensor(0.7888)",
            "std": "tensor(0.3444)"
        },
        "avg": "tensor([1.0000, 0.9840, 0.9439, 0.2271])",
        "rep": {
            "avg": "tensor(0.9760)",
            "std": "tensor(0.0468)"
        },
        "std": "tensor([5.7627e-07, 2.9689e-02, 6.3541e-02, 2.1684e-01])"
    },
    "cosine": {
        "all": {
            "avg": "tensor(0.5945)",
            "std": "tensor(0.7146)"
        },
        "avg": "tensor([ 0.9825,  0.9001,  0.7907, -0.2953])",
        "rep": {
            "avg": "tensor(0.8911)",
            "std": "tensor(0.1571)"
        },
        "std": "tensor([0.0371, 0.1231, 0.1975, 0.9554])"
    },
    "nes": {
        "all": {
            "avg": "tensor(0.6773)",
            "std": "tensor(0.2886)"
        },
        "avg": "tensor([0.9326, 0.8037, 0.6849, 0.2881])",
        "rep": {
            "avg": "tensor(0.8070)",
            "std": "tensor(0.1595)"
        },
        "std": "tensor([0.0695, 0.1265, 0.1576, 0.2341])"
    },
    "nes_output": {
        "all": {
            "avg": "None",
            "std": "None"
        },
        "avg": "tensor(0.2976)",
        "rep": {
            "avg": "None",
            "std": "None"
        },
        "std": "tensor(0.0945)"
    },
    "query_loss": {
        "all": {
            "avg": "None",
            "std": "None"
        },
        "avg": "tensor(12.3616)",
        "rep": {
            "avg": "None",
            "std": "None"
        },
        "std": "tensor(13.7976)"
    }
}

Two submit buttons in one form

An even better solution consists of using button tags to submit the form:

<form>
    ...
    <button type="submit" name="action" value="update">Update</button>
    <button type="submit" name="action" value="delete">Delete</button>
</form>

The HTML inside the button (e.g. ..>Update<.. is what is seen by the user; because there is HTML provided, the value is not user-visible; it is only sent to server. This way there is no inconvenience with internationalization and multiple display languages (in the former solution, the label of the button is also the value sent to the server).

How can I escape a double quote inside double quotes?

A simple example of escaping quotes in the shell:

$ echo 'abc'\''abc'
abc'abc
$ echo "abc"\""abc"
abc"abc

It's done by finishing an already-opened one ('), placing the escaped one (\'), and then opening another one (').

Alternatively:

$ echo 'abc'"'"'abc'
abc'abc
$ echo "abc"'"'"abc"
abc"abc

It's done by finishing already opened one ('), placing a quote in another quote ("'"), and then opening another one (').

More examples: Escaping single-quotes within single-quoted strings

Eclipse - java.lang.ClassNotFoundException

Go To Build Path -> Source and toggle to Yes option "Ignore Optional Compile Problems" for all source folders.

How to truncate float values?

The core idea given here seems to me to be the best approach for this problem. Unfortunately, it has received less votes while the later answer that has more votes is not complete (as observed in the comments). Hopefully, the implementation below provides a short and complete solution for truncation.

_x000D_

def trunc(num, digits):_x000D_
    l = str(float(num)).split('.')_x000D_
    digits = min(len(l[1]), digits)_x000D_
    return (l[0]+'.'+l[1][:digits])

_x000D_

which should take care of all corner cases found here and here.

How to deploy a React App on Apache web server

Before making the npm build,
1) Go to your React project root folder and open package.json.
2) Add "homepage" attribute to package.json

if you want to provide absolute path

"homepage": "http://hostName.com/appLocation",
"name": "react-app",
"version": "1.1.0",

if you want to provide relative path
```
"homepage": "./",
"name": "react-app",
```
Using relative path method may warn a syntax validation error in your IDE. But the build is made without any errors during compilation.

3) Save the package.json , and in terminal run npm run-script build
4) Copy the contents of build/ folder to your server directory.

PS: It is easy to use relative path method if you want to change the build file location in your server frequently.

Selecting one row from MySQL using mysql_* API

Try with mysql_fetch_assoc .It will returns an associative array of strings that corresponds to the fetched row, or FALSE if there are no more rows. Furthermore, you have to add LIMIT 1 if you really expect single row.

$result = mysql_query("SELECT option_value FROM wp_10_options WHERE option_name='homepage' LIMIT 1");
$row = mysql_fetch_assoc($result);
echo $row['option_value'];

jQuery show/hide options from one select drop down, when option on other select dropdown is slected

A litle late perhaps but I would suggest

$(document).ready(function() {
    var layout_select_html = $('#layout_select').html(); //save original dropdown list

    $("#column_select").change(function () {
        var cur_column_val = $(this).val(); //save the selected value of the first dropdown
        $('#layout_select').html(layout_select_html); //set original dropdown list back
        $('#layout_select').children('option').each(function(){ //loop through options
        if($(this).val().indexOf(cur_column_val)== -1){ //do your conditional and if it should not be in the dropdown list
           $(this).remove(); //remove option from list
        }
    });
});

Take the content of a list and append it to another list

Take a look at itertools.chain for a fast way to treat many small lists as a single big list (or at least as a single big iterable) without copying the smaller lists:

>>> import itertools
>>> p = ['a', 'b', 'c']
>>> q = ['d', 'e', 'f']
>>> r = ['g', 'h', 'i']
>>> for x in itertools.chain(p, q, r):
        print x.upper()

Make WPF Application Fullscreen (Cover startmenu)

If you want user to change between WindowStyle.SingleBorderWindow and WindowStyle.None at runtime you can bring this at code behind:

Make application fullscreen:

RootWindow.Visibility = Visibility.Collapsed;
RootWindow.WindowStyle = WindowStyle.None;
RootWindow.ResizeMode = ResizeMode.NoResize;
RootWindow.WindowState = WindowState.Maximized;
RootWindow.Topmost = true;
RootWindow.Visibility = Visibility.Visible;

Return to single border style:

RootWindow.WindowStyle = WindowStyle.SingleBorderWindow;
RootWindow.ResizeMode = ResizeMode.CanResize;
RootWindow.Topmost = false;

Note that without RootWindow.Visibility property your window will not cover start menu, however you can skip this step if you making application fullscreen once at startup.

Custom Input[type="submit"] style not working with jquerymobile button

jQuery Mobile >= 1.4

Create a custom class, e.g. .custom-btn. Note that to override jQM styles without using !important, CSS hierarchy should be respected. .ui-btn.custom-class or .ui-input-btn.custom-class.

.ui-input-btn.custom-btn {
   border:1px solid red;
   text-decoration:none;
   font-family:helvetica;
   color:red;
   background:url(img.png) repeat-x;
}

Add a data-wrapper-class to input. The custom class will be added to input wrapping div.

<input type="button" data-wrapper-class="custom-btn">

Demo

jQuery Mobile <= 1.3

Input button is wrapped by a DIV with class ui-btn. You need to select that div and the input[type="submit"]. Using !important is essential to override Jquery Mobile styles.

Demo

div.ui-btn, input[type="submit"] {
 border:1px solid red !important;
 text-decoration:none !important;
 font-family:helvetica !important;
 color:red !important;
 background:url(../images/btn_hover.png) repeat-x !important;
}

Why does Java have transient fields?

Before I respond to this question, I must explain to you the SERIALIZATION, because if you understand what it means serialization in science computer you can easily understand this keyword.

Serialization When an object is transferred through the network / saved on physical media(file,...), the object must be "serialized". Serialization converts byte status object series. These bytes are sent on the network/saved and the object is re-created from these bytes.
Example

public class Foo implements Serializable 
{
 private String attr1;
 private String attr2;
 ...
}

Now IF YOU WANT TO do NOT TRANSFERT/SAVED field of this object SO, you can use keyword transient

private transient attr2;

Example

How to Call a JS function using OnClick event

You could use addEventListener to add as many listeners as you want.

  document.getElementById("Save").addEventListener('click',function ()
    {
     alert("hello");
     //validation code to see State field is mandatory.  
    }  );

Also add script tag after the element to make sure Save element is loaded at the time when script runs

Rather than moving script tag you could call it when dom is loaded. Then you should place your code inside the

document.addEventListener('DOMContentLoaded', function() {
    document.getElementById("Save").addEventListener('click',function ()
    {
     alert("hello");
     //validation code to see State field is mandatory.  
    }  ); 
});

example

How to copy file from HDFS to the local file system

In order to copy files from HDFS to the local file system the following command could be run:

hadoop dfs -copyToLocal <input> <output>

<input>: the HDFS directory path (e.g /mydata) that you want to copy
<output>: the destination directory path (e.g. ~/Documents)

How to check if any Checkbox is checked in Angular

You can do something like:

function ChckbxsCtrl($scope, $filter) {
    $scope.chkbxs = [{
        label: "Led Zeppelin",
        val: false
    }, {
        label: "Electric Light Orchestra",
        val: false
    }, {
        label: "Mark Almond",
        val: false
    }];

    $scope.$watch("chkbxs", function(n, o) {
        var trues = $filter("filter")(n, {
            val: true
        });
        $scope.flag = trues.length;
    }, true);
}

And a template:

<div ng-controller="ChckbxsCtrl">
    <div ng-repeat="chk in chkbxs">
        <input type="checkbox" ng-model="chk.val" />
        <label>{{chk.label}}</label>
    </div>
    <div ng-show="flag">I'm ON when band choosed</div>
</div>

Working: http://jsfiddle.net/cherniv/JBwmA/

UPDATE: Or you can go little bit different way , without using $scope's $watch() method, like:

$scope.bandChoosed = function() {
    var trues = $filter("filter")($scope.chkbxs, {
        val: true
    });
    return trues.length;
}

And in a template do:

<div ng-show="bandChoosed()">I'm ON when band choosed</div>

Fiddle: http://jsfiddle.net/uzs4sgnp/

How to specify HTTP error code?

Per the Express (Version 4+) docs, you can use:

res.status(400);
res.send('None shall pass');

http://expressjs.com/4x/api.html#res.status

<=3.8

res.statusCode = 401;
res.send('None shall pass');

PHP Accessing Parent Class Variable

With parent::$bb; you try to retrieve the static constant defined with the value of $bb.

Instead, do:

echo $this->bb;

Note: you don't need to call parent::_construct if B is the only class that calls it. Simply don't declare __construct in B class.

Object passed as parameter to another class, by value or reference?

"Objects" are NEVER passed in C# -- "objects" are not values in the language. The only types in the language are primitive types, struct types, etc. and reference types. No "object types".

The types Object, MyClass, etc. are reference types. Their values are "references" -- pointers to objects. Objects can only be manipulated through references -- when you do new on them, you get a reference, the . operator operates on a reference; etc. There is no way to get a variable whose value "is" an object, because there are no object types.

All types, including reference types, can be passed by value or by reference. A parameter is passed by reference if it has a keyword like ref or out. The SetObject method's obj parameter (which is of a reference type) does not have such a keyword, so it is passed by value -- the reference is passed by value.

how to run a command at terminal from java program?

I know this question is quite old, but here's a library that encapsulates the ProcessBuilder api.

How to use UIScrollView in Storyboard

Here's a bit of a grubby answer that get's to the same solution for vertical scroll views, but (against the ethos of stackoverflow) doesn't answer the question. Instead of using a scrollView, just use a UITableView, drag a normal UIView into the header, and make it as big as you want, you can now scroll the content in storyboard.

Find out if string ends with another string in C++

Use boost::algorithm::ends_with (see e.g. http://www.boost.org/doc/libs/1_34_0/doc/html/boost/algorithm/ends_with.html ):

#include <boost/algorithm/string/predicate.hpp>

// works with const char* 
assert(boost::algorithm::ends_with("mystring", "ing"));

// also works with std::string
std::string haystack("mystring");
std::string needle("ing");
assert(boost::algorithm::ends_with(haystack, needle));

std::string haystack2("ng");
assert(! boost::algorithm::ends_with(haystack2, needle));

How can I initialize C++ object member variables in the constructor?

Regarding the first (and great) answer from chris who proposed a solution to the situation where the class members are held as a "true composite" members (i.e.- not as pointers nor references):

The note is a bit large, so I will demonstrate it here with some sample code.

When you chose to hold the members as I mentioned, you have to keep in mind also these two things:

For every "composed object" that does not have a default constructor - you must initialize it in the initialization list of all the constructor's of the "father" class (i.e.- BigMommaClass or MyClass in the original examples and MyClass in the code below), in case there are several (see InnerClass1 in the example below). Meaning, you can "comment out" the m_innerClass1(a) and m_innerClass1(15) only if you enable the InnerClass1 default constructor.
For every "composed object" that does have a default constructor - you may initialize it within the initialization list, but it will work also if you chose not to (see InnerClass2 in the example below).

See sample code (compiled under Ubuntu 18.04 (Bionic Beaver) with g++ version 7.3.0):

#include <iostream>

using namespace std;

class InnerClass1
{
    public:
        InnerClass1(int a) : m_a(a)
        {
            cout << "InnerClass1::InnerClass1 - set m_a:" << m_a << endl;
        }

        /* No default constructor
        InnerClass1() : m_a(15)
        {
            cout << "InnerClass1::InnerClass1() - set m_a:" << m_a << endl;
        }
        */

        ~InnerClass1()
        {
            cout << "InnerClass1::~InnerClass1" << endl;
        }

    private:
        int m_a;
};

class InnerClass2
{
    public:
        InnerClass2(int a) : m_a(a)
        {
            cout << "InnerClass2::InnerClass2 - set m_a:" << m_a << endl;
        }

        InnerClass2() : m_a(15)
        {
            cout << "InnerClass2::InnerClass2() - set m_a:" << m_a << endl;
        }

        ~InnerClass2()
        {
            cout << "InnerClass2::~InnerClass2" << endl;
        }

    private:
        int m_a;
};

class MyClass
{
    public:
        MyClass(int a, int b) : m_innerClass1(a), /* m_innerClass2(a),*/ m_b(b)
        {
            cout << "MyClass::MyClass(int b) - set m_b to:" << m_b << endl;
        }

         MyClass() : m_innerClass1(15), /*m_innerClass2(15),*/ m_b(17)
        {
            cout << "MyClass::MyClass() - m_b:" << m_b << endl;
        }

        ~MyClass()
        {
            cout << "MyClass::~MyClass" << endl;
        }

    private:
        InnerClass1 m_innerClass1;
        InnerClass2 m_innerClass2;
        int m_b;
};

int main(int argc, char** argv)
{
    cout << "main - start" << endl;

    MyClass obj;

    cout << "main - end" << endl;
    return 0;
}

How can I control the width of a label tag?

Giving width to Label is not a proper way. you should take one div or table structure to manage this. but still if you don't want to change your whole code then you can use following code.

label {
  width:200px;
  float: left;
}

Jquery - animate height toggle

I just thought to give you the reason why your solution did not work:

When $(document).ready() is executed only the $('#topbar-show') selector can find a matching element from the DOM. The #topbar-show element has not been created yet.

To get past this problem, you may use live event bindings

$('#topbar-show').live('click',function(e){});
$('#topbar-hide').live('click',function(e){});

This is the most simple way to fix you solution. The rest of these answer go further to provide you a better solutions instead that do not modify the hopefully permanent id attribute.

Display JSON as HTML

something like this ??

pretty-json

https://github.com/warfares/pretty-json

live sample:

http://warfares.github.com/pretty-json/

Java Garbage Collection Log messages

Most of it is explained in the GC Tuning Guide (which you would do well to read anyway).

The command line option -verbose:gc causes information about the heap and garbage collection to be printed at each collection. For example, here is output from a large server application:
[GC 325407K->83000K(776768K), 0.2300771 secs]
[GC 325816K->83372K(776768K), 0.2454258 secs]
[Full GC 267628K->83769K(776768K), 1.8479984 secs]
Here we see two minor collections followed by one major collection. The numbers before and after the arrow (e.g., 325407K->83000K from the first line) indicate the combined size of live objects before and after garbage collection, respectively. After minor collections the size includes some objects that are garbage (no longer alive) but that cannot be reclaimed. These objects are either contained in the tenured generation, or referenced from the tenured or permanent generations.

The next number in parentheses (e.g., (776768K) again from the first line) is the committed size of the heap: the amount of space usable for java objects without requesting more memory from the operating system. Note that this number does not include one of the survivor spaces, since only one can be used at any given time, and also does not include the permanent generation, which holds metadata used by the virtual machine.

The last item on the line (e.g., 0.2300771 secs) indicates the time taken to perform the collection; in this case approximately a quarter of a second.

The format for the major collection in the third line is similar.

The format of the output produced by -verbose:gc is subject to change in future releases.

I'm not certain why there's a PSYoungGen in yours; did you change the garbage collector?

error CS0103: The name ' ' does not exist in the current context

using System;
using System.Collections.Generic;                    (???????? ?????????? ?? ?? ?????
using System.Linq;                                     ?????? PlayerScript.health = 
using System.Text;                                      999999; ??? ?? ???? ??????)                                  
using System.Threading.Tasks;
using UnityEngine;

namespace OneHack
{
    public class One
    {
        public Rect RT_MainMenu = new Rect(0f, 100f, 120f, 100f); //Rect ??? ????????????????? ???? ?? x,y ? ??????, ??????.
        public int ID_RTMainMenu = 1;
        private bool MainMenu = true;
        private void Menu_MainMenu(int id) //??????? ????
        {
            if (GUILayout.Button("???????? ????? ??????", new GUILayoutOption[0]))
            {
                if (GUILayout.Button("??????????", new GUILayoutOption[0]))
                {
                    PlayerScript.health = 999999;//??? ??????? ?? ?????? ? ?????? ??????????????? ???????? 999999  //????? ???, ??????? ????? ??????????? ??? ??????? ?? ??? ??????
                }
            }
        }
        private void OnGUI()
        {
            if (this.MainMenu)
            {
                this.RT_MainMenu = GUILayout.Window(this.ID_RTMainMenu, this.RT_MainMenu, new GUI.WindowFunction(this.Menu_MainMenu), "MainMenu", new GUILayoutOption[0]);
            }
        }
        private void Update() //????????? ??????????? ?????, ??? ??? ????? ????? ????????? ????? ??????????? ??????????
        {
            if (Input.GetKeyDown(KeyCode.Insert)) //?????? ?? ??????? ????? ??????????? ? ??????????? ????, ????? ????????? ??????
            {
                this.MainMenu = !this.MainMenu;
            }
        }
    }
}

Executing JavaScript without a browser?

Well there is JavaScript as OSA, an extension that provides JavaScript as an alternative to appleScript. I've been using that about 10 years ago, don't know if it's still working with current OS versions

How to define dimens.xml for every different screen size in android?

I've uploaded a simple java program which takes your project location and the dimension file you want as input. Based on that, it would output the corresponding dimension file in the console. Here's the link to it:

https://github.com/akeshwar/Dimens-for-different-screens-in-Android/blob/master/Main.java

Here's the full code for the reference:

public class Main {


    /**
     * You can change your factors here. The current factors are in accordance with the official documentation.
     */
    private static final double LDPI_FACTOR = 0.375;
    private static final double MDPI_FACTOR = 0.5;
    private static final double HDPI_FACTOR = 0.75;
    private static final double XHDPI_FACTOR = 1.0;
    private static final double XXHDPI_FACTOR = 1.5;
    private static final double XXXHDPI_FACTOR = 2.0;

    private static double factor;

    public static void main(String[] args) throws IOException {


        Scanner in = new Scanner(System.in);
        System.out.println("Enter the location of the project/module");
        String projectPath = in.nextLine();

        System.out.println("Which of the following dimension file do you want?\n1. ldpi \n2. mdpi \n3. hdpi \n4. xhdpi \n5. xxhdpi \n6. xxxhdpi");

        int dimenType = in.nextInt();

        switch (dimenType) {
            case 1: factor = LDPI_FACTOR;
                break;
            case 2: factor = MDPI_FACTOR;
                break;
            case 3: factor = HDPI_FACTOR;
                break;
            case 4: factor = XHDPI_FACTOR;
                break;
            case 5: factor = XXHDPI_FACTOR;
                break;
            case 6: factor = XXXHDPI_FACTOR;
                break;
            default:
                factor = 1.0;
        }

        //full path = "/home/akeshwar/android-sat-bothIncluded-notintegrated/code/tpr-5-5-9/princetonReview/src/main/res/values/dimens.xml"
        //location of the project or module = "/home/akeshwar/android-sat-bothIncluded-notintegrated/code/tpr-5-5-9/princetonReview/"


        /**
         * In case there is some I/O exception with the file, you can directly copy-paste the full path to the file here:
         */
        String fullPath = projectPath + "/src/main/res/values/dimens.xml";

        FileInputStream fstream = new FileInputStream(fullPath);
        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));

        String strLine;

        while ((strLine = br.readLine()) != null)   {
            modifyLine(strLine);
        }
        br.close();

    }

    private static void modifyLine(String line) {

        /**
         * Well, this is how I'm detecting if the line has some dimension value or not.
         */
        if(line.contains("p</")) {
            int endIndex = line.indexOf("p</");

            //since indexOf returns the first instance of the occurring string. And, the actual dimension would follow after the first ">" in the screen
            int begIndex = line.indexOf(">");

            String prefix = line.substring(0, begIndex+1);
            String root = line.substring(begIndex+1, endIndex-1);
            String suffix = line.substring(endIndex-1,line.length());


            /**
             * Now, we have the root. We can use it to create different dimensions. Root is simply the dimension number.
             */

            double dimens = Double.parseDouble(root);
            dimens = dimens*factor*1000;
            dimens = (double)((int)dimens);
            dimens = dimens/1000;
            root = dimens + "";

            System.out.println(prefix + " " +  root + " " + suffix );

        }

        System.out.println(line);
    }
}

Why do I get the "Unhandled exception type IOException"?

I got the Error even though i was catching the exception.

    try {
        bitmap = BitmapFactory.decodeStream(getAssets().open("kitten.jpg"));
    } catch (IOException e) {
        Log.e("blabla", "Error", e);
        finish();
    }

Issue was that the IOException wasn't imported

import java.io.IOException;

Integer to IP Address - C

From string to int and back

const char * s_ip = "192.168.0.5";
unsigned int ip;
unsigned char * c_ip = (unsigned char *)&ip;
sscanf(s_ip, "%hhu.%hhu.%hhu.%hhu", &c_ip[3], &c_ip[2], &c_ip[1], &c_ip[0]);
printf("%u.%u.%u.%u", ((ip & 0xff000000) >> 24), ((ip & 0x00ff0000) >> 16), ((ip & 0x0000ff00) >> 8), (ip & 0x000000ff));

%hhu instructs sscanf to read into unsigned char pointer; (Reading small int with scanf)

inet_ntoa from glibc

char *
inet_ntoa (struct in_addr in)
{
unsigned char *bytes = (unsigned char *) &in;
__snprintf (buffer, sizeof (buffer), "%d.%d.%d.%d",
bytes[0], bytes[1], bytes[2], bytes[3]);
return buffer;
}

How to filter rows in pandas by regex

It may be a bit late, but this is now easier to do in Pandas by calling Series.str.match. The docs explain the difference between match, fullmatch and contains.

Note that in order to use the results for indexing, set the na=False argument (or True if you want to include NANs in the results).

How to increase font size in NeatBeans IDE?

When i modify the font size in Tools-> Options->Fonts & Colors->Syntaxto 14, the Editor font change fine, but Netbeans doesn´t take any change in fontsize IDE (icons, menus, ...) until i Add the --fontsize XX option in the file ...\NetBeans x.x\etc\netbeans.conf at the end of line netbeans_default_options AND set to true the already added option -J-Dsun.java2d.dpiaware, But i had to increase the font size Editor to 24. Thats works for me.

How to pass parameters to maven build using pom.xml?

We can Supply parameter in different way after some search I found some useful

<plugin>
  <artifactId>${release.artifactId}</artifactId>
  <version>${release.version}-${release.svm.version}</version>...

...

Actually in my application I need to save and supply SVN Version as parameter so i have implemented as above .

While Running build we need supply value for those parameter as follows.

RestProj_Bizs>mvn clean install package -Drelease.artifactId=RestAPIBiz -Drelease.version=10.6 -Drelease.svm.version=74

Here I am supplying

release.artifactId=RestAPIBiz
release.version=10.6
release.svm.version=74

It worked for me. Thanks

What is the most robust way to force a UIView to redraw?

The guaranteed, rock solid way to force a UIView to re-render is [myView setNeedsDisplay]. If you're having trouble with that, you're likely running into one of these issues:

You're calling it before you actually have the data, or your -drawRect: is over-caching something.
You're expecting the view to draw at the moment you call this method. There is intentionally no way to demand "draw right now this very second" using the Cocoa drawing system. That would disrupt the entire view compositing system, trash performance and likely create all kinds of artifacting. There are only ways to say "this needs to be drawn in the next draw cycle."

If what you need is "some logic, draw, some more logic," then you need to put the "some more logic" in a separate method and invoke it using -performSelector:withObject:afterDelay: with a delay of 0. That will put "some more logic" after the next draw cycle. See this question for an example of that kind of code, and a case where it might be needed (though it's usually best to look for other solutions if possible since it complicates the code).

If you don't think things are getting drawn, put a breakpoint in -drawRect: and see when you're getting called. If you're calling -setNeedsDisplay, but -drawRect: isn't getting called in the next event loop, then dig into your view hierarchy and make sure you're not trying to outsmart is somewhere. Over-cleverness is the #1 cause of bad drawing in my experience. When you think you know best how to trick the system into doing what you want, you usually get it doing exactly what you don't want.

how do I get eclipse to use a different compiler version for Java?

From the menu bar: Project -> Properties -> Java Compiler

Enable project specific settings (checked) Uncheck "use Compliance from execution environment '.... Select the desired "compiler compliance level"

That will allow you to compile "1.5" code using a "1.6" JDK.

If you want to acutally use a 1.5 JDK to produce "1.5" compliant code, then install a suitable 1.5 JDK and tell eclipse where it is installed via:

Window -> preferences -> Installed JREs

And then go back to your project

Project -> properties -> Java Build Path -> libraries

remove the 1.6 system libaries, and: add library... -> JRE System LIbrary -> Alternate JRE -> The JRE you want.

Verify that the correct JRE is on the project's build path, save everything, and enjoy!

How to fix the datetime2 out-of-range conversion error using DbContext and SetInitializer?

You have to ensure that Start is greater than or equal to SqlDateTime.MinValue (January 1, 1753) - by default Start equals DateTime.MinValue (January 1, 0001).

Start and stop a timer PHP

You can use microtime and calculate the difference:

$time_pre = microtime(true);
exec(...);
$time_post = microtime(true);
$exec_time = $time_post - $time_pre;

Here's the PHP docs for microtime: http://php.net/manual/en/function.microtime.php

Free ASP.Net and/or CSS Themes

As always, http://www.csszengarden.com/. Note that the images aren't public domain.

Passing data into "router-outlet" child components

Service:

import {Injectable, EventEmitter} from "@angular/core";    

@Injectable()
export class DataService {
onGetData: EventEmitter = new EventEmitter();

getData() {
  this.http.post(...params).map(res => {
    this.onGetData.emit(res.json());
  })
}

Component:

import {Component} from '@angular/core';    
import {DataService} from "../services/data.service";       
    
@Component()
export class MyComponent {
  constructor(private DataService:DataService) {
    this.DataService.onGetData.subscribe(res => {
      (from service on .emit() )
    })
  }

  //To send data to all subscribers from current component
  sendData() {
    this.DataService.onGetData.emit(--NEW DATA--);
  }
}

Generate random numbers with a given (numerical) distribution

(OK, I know you are asking for shrink-wrap, but maybe those home-grown solutions just weren't succinct enough for your liking. :-)

pdf = [(1, 0.1), (2, 0.05), (3, 0.05), (4, 0.2), (5, 0.4), (6, 0.2)]
cdf = [(i, sum(p for j,p in pdf if j < i)) for i,_ in pdf]
R = max(i for r in [random.random()] for i,c in cdf if c <= r)

I pseudo-confirmed that this works by eyeballing the output of this expression:

sorted(max(i for r in [random.random()] for i,c in cdf if c <= r)
       for _ in range(1000))

Which header file do you include to use bool type in c in linux?

bool is just a macro that expands to _Bool. You can use _Bool with no #include very much like you can use int or double; it is a C99 keyword.

The macro is defined in <stdbool.h> along with 3 other macros.

The macros defined are

bool: macro expands to _Bool
false: macro expands to 0
true: macro expands to 1
__bool_true_false_are_defined: macro expands to 1

How to sort a List<Object> alphabetically using Object name field

I found another way to do the type.

if(listAxu.size() > 0){
    Collections.sort(listAxu, Comparator.comparing(IdentityNamed::getDescricao));
}

Border around specific rows in a table?

The only other way I can think of to do it is to enclose each of the rows you need a border around in a nested table. That will make the border easier to do but will potentially creat other layout issues, you'll have to manually set the width on table cells etc.

Your approach may well be the best one depending on your other layout rerquirements and the suggested approach here is just a possible alternative.

<table cellspacing="0">  
    <tr>    
        <td>no border</td>    
        <td>no border here either</td>  
    </tr>  
    <tr>
        <td>
             <table style="border: thin solid black">
                  <tr>    
                        <td>one</td>    
                        <td>two</td>  
                  </tr>  
                  <tr>    
                      <td>three</td>    
                      <td>four</td>  
                  </tr>  
             </table>
         </td>
    </tr>
    <tr>    
         <td colspan="2">once again no borders</td>  
    </tr>  
    <tr>
        <td>
             <table style="border: thin solid black">
                  <tr>    
                        <td>hello</td>  
                   </tr>
             </table>
         </td>
    </tr>
    <tr>    
         <td colspan="2">world</td>  
    </tr>
</table>

Prevent flex items from overflowing a container

max-width works for me.

aside {
  flex: 0 1 200px;
  max-width: 200px;
}

Variables of CSS pre-processors allows to avoid hard-coding.

aside {
  $WIDTH: 200px;
  flex: 0 1 $WIDTH;
  max-width: $WIDTH;
}

overflow: hidden also works, but I lately I try do not use it because it hides the elements as popups and dropdowns.

The remote certificate is invalid according to the validation procedure

Try put this before send e-mail

ServicePointManager.ServerCertificateValidationCallback = 
        delegate(object s, X509Certificate certificate, X509Chain chain,
        SslPolicyErrors sslPolicyErrors) { return true; };

Remenber to add the using libs!

Allow user to select camera or gallery for image

Building upon David's answer, my two pennies on the onActivityResult() part. It takes care of the changes introduced in 5.1.1 and detects whether the user has picked a single or multiple image from the library.

private enum Outcome {
    camera, singleLibrary, multipleLibrary, unknown
}

/**
 * Returns a List<Uri> containing the image uri(s) chosen by the user
 *
 * @param data      The data intent coming from the onActivityResult()
 * @param cameraUri The uri that had been passed to the intent when the chooser was invoked.
 * @return A List<Uri>, never null.
 */
public List<Uri> getPicturesUriFromIntent(Intent data, Uri cameraUri) {

    Outcome outcome = Outcome.unknown;

    if (data == null || (data.getData() == null && data.getClipData() == null)) {
        outcome = Outcome.camera;
    } else if (data.getData() != null && data.getClipData() == null) {
        outcome = Outcome.singleLibrary;
    } else if (data.getData() == null) {
        outcome = Outcome.multipleLibrary;
    } else {
        final String action = data.getAction();
        if (action != null && action.equals(MediaStore.ACTION_IMAGE_CAPTURE)) {
            outcome = Outcome.camera;
        }
    }

    // list the uri(s) we got back
    List<Uri> uris = new ArrayList<>();
    switch (outcome) {
        case camera:
            uris.add(cameraUri);
            break;

        case singleLibrary:
            uris.add(data.getData());
            break;

        case multipleLibrary:
            final ClipData clipData = data.getClipData();
            for (int i = 0; i < clipData.getItemCount(); i++) {
                ClipData.Item item = clipData.getItemAt(i);
                uris.add(item.getUri());
            }
            break;
    }

    return uris;
}

How to hide axes and gridlines in Matplotlib (python)

Turn the axes off with:

plt.axis('off')

And gridlines with:

plt.grid(b=None)

In STL maps, is it better to use map::insert than []?

The two have different semantics when it comes to the key already existing in the map. So they aren't really directly comparable.

But the operator[] version requires default constructing the value, and then assigning, so if this is more expensive then copy construction, then it will be more expensive. Sometimes default construction doesn't make sense, and then it would be impossible to use the operator[] version.

EC2 Instance Cloning

You can use AWS API or console UI to create an AMI(Amazon Machine Image) of your running instance. You can specify to reboot the instance when create your AMI. Then you can use AWS API or console UI to launch more instances with the AMI you created.

Disable/turn off inherited CSS3 transitions

Additionally there is a possibility to set a list of properties that will get transitioned by setting the property transition-property: width, height;, more details here

Java Timer vs ExecutorService?

ExecutorService is newer and more general. A timer is just a thread that periodically runs stuff you have scheduled for it.

An ExecutorService may be a thread pool, or even spread out across other systems in a cluster and do things like one-off batch execution, etc...

Just look at what each offers to decide.

Error: Generic Array Creation

You can't create arrays with a generic component type.

Create an array of an explicit type, like Object[], instead. You can then cast this to PCB[] if you want, but I don't recommend it in most cases.

PCB[] res = (PCB[]) new Object[list.size()]; /* Not type-safe. */

If you want type safety, use a collection like java.util.List<PCB> instead of an array.

By the way, if list is already a java.util.List, you should use one of its toArray() methods, instead of duplicating them in your code. This doesn't get your around the type-safety problem though.

java.util.zip.ZipException: duplicate entry during packageAllDebugClassesForMultiDex

just erase android/support/v4/util/TimeUtils.class

Reload child component when variables on parent component changes. Angular2

Use @Input to pass your data to child components and then use ngOnChanges (https://angular.io/api/core/OnChanges) to see if that @Input changed on the fly.

Returning a value from callback function in Node.js

Its undefined because, console.log(response) runs before doCall(urlToCall); is finished. You have to pass in a callback function aswell, that runs when your request is done.

First, your function. Pass it a callback:

function doCall(urlToCall, callback) {
    urllib.request(urlToCall, { wd: 'nodejs' }, function (err, data, response) {                              
        var statusCode = response.statusCode;
        finalData = getResponseJson(statusCode, data.toString());
        return callback(finalData);
    });
}

Now:

var urlToCall = "http://myUrlToCall";
doCall(urlToCall, function(response){
    // Here you have access to your variable
    console.log(response);
})

@Rodrigo, posted a good resource in the comments. Read about callbacks in node and how they work. Remember, it is asynchronous code.

Deny all, allow only one IP through htaccess

Improving a bit more the previous answers, a maintenance page can be shown to your users while you perform changes to the site:

ErrorDocument 403 /maintenance.html
Order Allow,Deny
Allow from #.#.#.#

Where:

#.#.#.# is your IP: What Is My IP Address?
For maintenance.html there is a nice example here: Simple Maintenance Page

Create tap-able "links" in the NSAttributedString of a UILabel?

Here’s a Swift implementation that is about as minimal as possible that also includes touch feedback. Caveats:

You must set fonts in your NSAttributedStrings
You can only use NSAttributedStrings!
You must ensure your links cannot wrap (use non breaking spaces: "\u{a0}")
You cannot change the lineBreakMode or numberOfLines after setting the text
You create links by adding attributes with .link keys

public class LinkLabel: UILabel {
    private var storage: NSTextStorage?
    private let textContainer = NSTextContainer()
    private let layoutManager = NSLayoutManager()
    private var selectedBackgroundView = UIView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        textContainer.lineFragmentPadding = 0
        layoutManager.addTextContainer(textContainer)
        textContainer.layoutManager = layoutManager
        isUserInteractionEnabled = true
        selectedBackgroundView.isHidden = true
        selectedBackgroundView.backgroundColor = UIColor(white: 0, alpha: 0.3333)
        selectedBackgroundView.layer.cornerRadius = 4
        addSubview(selectedBackgroundView)
    }

    public required convenience init(coder: NSCoder) {
        self.init(frame: .zero)
    }

    public override func layoutSubviews() {
        super.layoutSubviews()
        textContainer.size = frame.size
    }

    public override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        setLink(for: touches)
    }

    public override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesMoved(touches, with: event)
        setLink(for: touches)
    }

    private func setLink(for touches: Set<UITouch>) {
        if let pt = touches.first?.location(in: self), let (characterRange, _) = link(at: pt) {
            let glyphRange = layoutManager.glyphRange(forCharacterRange: characterRange, actualCharacterRange: nil)
            selectedBackgroundView.frame = layoutManager.boundingRect(forGlyphRange: glyphRange, in: textContainer).insetBy(dx: -3, dy: -3)
            selectedBackgroundView.isHidden = false
        } else {
            selectedBackgroundView.isHidden = true
        }
    }

    public override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesCancelled(touches, with: event)
        selectedBackgroundView.isHidden = true
    }

    public override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesEnded(touches, with: event)
        selectedBackgroundView.isHidden = true

        if let pt = touches.first?.location(in: self), let (_, url) = link(at: pt) {
            UIApplication.shared.open(url)
        }
    }

    private func link(at point: CGPoint) -> (NSRange, URL)? {
        let touchedGlyph = layoutManager.glyphIndex(for: point, in: textContainer)
        let touchedChar = layoutManager.characterIndexForGlyph(at: touchedGlyph)
        var range = NSRange()
        let attrs = attributedText!.attributes(at: touchedChar, effectiveRange: &range)
        if let urlstr = attrs[.link] as? String {
            return (range, URL(string: urlstr)!)
        } else {
            return nil
        }
    }

    public override var attributedText: NSAttributedString? {
        didSet {
            textContainer.maximumNumberOfLines = numberOfLines
            textContainer.lineBreakMode = lineBreakMode
            if let txt = attributedText {
                storage = NSTextStorage(attributedString: txt)
                storage!.addLayoutManager(layoutManager)
                layoutManager.textStorage = storage
                textContainer.size = frame.size
            }
        }
    }
}

Center button under form in bootstrap

Try giving

default width, display it with block and center it with margin: 0 auto;

like this:

<p style="display:block; line-height: 70px; width:200px; margin:0 auto;"><button type="submit" class="btn">Confirm</button></p>

How to float a div over Google Maps?

absolute positioning is evil... this solution doesn't take into account window size. If you resize the browser window, your div will be out of place!

Number of elements in a javascript object

function count(){
    var c= 0;
    for(var p in this) if(this.hasOwnProperty(p))++c;
    return c;
}

var O={a: 1, b: 2, c: 3};

count.call(O);

Python: Passing variables between functions

passing variable from one function as argument to other functions can be done like this

define functions like this

def function1():
global a
a=input("Enter any number\t")

def function2(argument):
print ("this is the entered number - ",argument)

call the functions like this

function1()
function2(a)

How to get my project path?

You can use

string wanted_path = Path.GetDirectoryName(Path.GetDirectoryName(System.IO.Directory.GetCurrentDirectory()));

How can I detect keydown or keypress event in angular.js?

You were on the right track with your "ng-keydown" attribute on the input, but you missed a simple step. Just because you put the ng-keydown attribute there, doesn't mean angular knows what to do with it. That's where "directives" come into play. You used the attribute correctly, but you now need to write a directive that will tell angular what to do when it sees that attribute on an html element.

The following is an example of how you would do that. We'll rename the directive from ng-keydown to on-keydown (to avoid breaking the "best practice" found here):

var mod = angular.module('mydirectives');
mod.directive('onKeydown', function() {
    return {
        restrict: 'A',
        link: function(scope, elem, attrs) {
             // this next line will convert the string
             // function name into an actual function
             var functionToCall = scope.$eval(attrs.ngKeydown);
             elem.on('keydown', function(e){
                  // on the keydown event, call my function
                  // and pass it the keycode of the key
                  // that was pressed
                  // ex: if ENTER was pressed, e.which == 13
                  functionToCall(e.which);
             });
        }
    };
});

The directive simple tells angular that when it sees an HTML attribute called "ng-keydown", it should listen to the element that has that attribute and call whatever function is passed to it. In the html you would have the following:

<input type="text" on-keydown="onKeydown">

And then in your controller (just like you already had), you would add a function to your controller's scope that is called "onKeydown", like so:

$scope.onKeydown = function(keycode){
    // do something with the keycode
}

Hopefully that helps either you or someone else who wants to know

How to execute a remote command over ssh with arguments?

Do it this way instead:

function mycommand {
    ssh [email protected] "cd testdir;./test.sh \"$1\""
}

You still have to pass the whole command as a single string, yet in that single string you need to have $1 expanded before it is sent to ssh so you need to use "" for it.

Update

Another proper way to do this actually is to use printf %q to properly quote the argument. This would make the argument safe to parse even if it has spaces, single quotes, double quotes, or any other character that may have a special meaning to the shell:

function mycommand {
    printf -v __ %q "$1"
    ssh [email protected] "cd testdir;./test.sh $__"
}

When declaring a function with function, () is not necessary.
Don't comment back about it just because you're a POSIXist.

How do I properly clean up Excel interop objects?

I think that some of that is just the way that the framework handles Office applications, but I could be wrong. On some days, some applications clean up the processes immediately, and other days it seems to wait until the application closes. In general, I quit paying attention to the details and just make sure that there aren't any extra processes floating around at the end of the day.

Also, and maybe I'm over simplifying things, but I think you can just...

objExcel = new Excel.Application();
objBook = (Excel.Workbook)(objExcel.Workbooks.Add(Type.Missing));
DoSomeStuff(objBook);
SaveTheBook(objBook);
objBook.Close(false, Type.Missing, Type.Missing);
objExcel.Quit();

Like I said earlier, I don't tend to pay attention to the details of when the Excel process appears or disappears, but that usually works for me. I also don't like to keep Excel processes around for anything other than the minimal amount of time, but I'm probably just being paranoid on that.

Type List vs type ArrayList in Java

The only case that I am aware of where (2) can be better is when using GWT, because it reduces application footprint (not my idea, but the google web toolkit team says so). But for regular java running inside the JVM (1) is probably always better.

How to import and use image in a Vue single file component?

You can also use the root shortcut like so

  <template>
   <div class="container">
    <h1>Recipes</h1>
      <img src="@/assets/burger.jpg" />
   </div>
  </template>

Although this was Nuxt, it should be same with Vue CLI.

CSS transition effect makes image blurry / moves image 1px, in Chrome?

None of this worked, what worked for me is scaling image down.

So depending on what size you want the image or what resoultion your image is, you can do something like this:

_x000D_

.ok {
      transform: perspective(100px) rotateY(0deg) scale(0.5);
      transition: transform 1s;
      object-fit:contain;
}
.ok:hover{
      transform: perspective(100px) rotateY(-10deg) scale(0.5);
}

/* Demo Preview Stuff */
.bad {
   max-width: 320px;
   object-fit:contain;
   transform: perspective(100px) rotateY(0deg);
   transition: transform 1s;
}
.bad:hover{
      transform: perspective(100px) rotateY(-10deg);
}

div {
     text-align: center;
     position: relative;
     display: flex;
}
h3{
    position: absolute;
    bottom: 30px;
    left: 0;
    right: 0;
}
     
.b {
    display: flex;
}

_x000D_

<center>
<h2>Hover on images</h2>
<div class="b">
<div>
  <img class="ok" src='https://www.howtogeek.com/wp-content/uploads/2018/10/preview-11.png'>
  <h3>Sharp</h3>
</div>

<div>
  <img class="bad" src='https://www.howtogeek.com/wp-content/uploads/2018/10/preview-11.png'>
  <h3>Blurry</h3>
</div>

</div>

</center>

_x000D_

The image should be scaled down, make sure you have a big image resoultion

.gitignore after commit

No you cannot force a file that is already committed in the repo to be removed just because it is added to the .gitignore

You have to git rm --cached to remove the files that you don't want in the repo. ( --cached since you probably want to keep the local copy but remove from the repo. ) So if you want to remove all the exe's from your repo do

git rm --cached /\*.exe

(Note that the asterisk * is quoted from the shell - this lets git, and not the shell, expand the pathnames of files and subdirectories)

Select Specific Columns from Spark DataFrame

Let's say our parent Dataframe has 'n' columns

we can create 'x' child DataFrames( Lets consider 2 in our case).

The columns for the child Dataframe can be chosen as per desire from any of the parent Dataframe columns.

Consider source has 10 columns and we want to split into 2 DataFrames that contains columns referenced from the parent Dataframe.

The columns for the child Dataframe can be decided using the select Dataframe API

val parentDF = spark.read.format("csv").load("/path of the CSV file")

val Child1_DF = parentDF.select("col1","col2","col3","col9","col10").show()

val child2_DF = parentDF.select("col5", "col6","col7","col8","col1","col2").show()

Notice that the column count in the child dataframes can differ in length and will be less than the parent dataframe column count.

we can also refer to the column names without mentioning the real names using the positional indexes of the desired column from the parent dataframe

Import spark implicits first which acts as a helper class for usage of $-notation to access the columns using the positional indexes

import spark.implicits._
import org.apache.spark.sql.functions._

val child3_DF  = parentDF.select("_c0","_c1","_c2","_c8","_c9").show()

we can also select column basing on certain conditions. Lets say we want only even numbered columns to be selected in the child dataframe. By even we refer to even indexed columns and index being starting from '0'

val parentColumns = parentDF.columns.toList


res0: List[String] = List(_c0, _c1, _c2, _c3, _c4, _c5, _c6, _c7,_c8,_c9)

val evenParentColumns =  res0.zipWithIndex.filter(_._2 % 2 == 0).map( _._1).toSeq

res1: scala.collection.immutable.Seq[String] = List(_c0, _c2, _c4, _c6,_c8)

Now feed these columns to be selected from the parentDF.Note that the select API need seq type arguments.So we converted the "evenParentColumns" to Seq collection

val child4_DF = parentDF.select(res1.head, res1.tail:_*).show()

This will show the even indexed columns from the parent Dataframe.

| _c0 | _c2 | _c4 |_c6 |_c8 |

|ITE00100554|TMAX|null| E| 1 |

|TE00100554 |TMIN|null| E| 4 |

|GM000010962|PRCP|null| E| 7 |

So Now we are left with the even numbered columns in the dataframe

Similarly we can also apply other operations to the Dataframe column like shown below

val child5_DF = parentDF.select($"_c0", $"_c8" + 1).show()

So by many ways as mentioned we can select the columns in the Dataframe.

IE prompts to open or save json result from server

Sounds like this SO question may be relevant to you:

How can I convince IE to simply display Application json rather than offer to download

If not:

Have you tried setting the dataType expected in the ajax options? i.e. dataType: 'json'

Have you tried other content types such as 'application/json' or 'text/javascript'

How do you pull first 100 characters of a string in PHP

try this function

function summary($str, $limit=100, $strip = false) {
    $str = ($strip == true)?strip_tags($str):$str;
    if (strlen ($str) > $limit) {
        $str = substr ($str, 0, $limit - 3);
        return (substr ($str, 0, strrpos ($str, ' ')).'...');
    }
    return trim($str);
}

How do you run a SQL Server query from PowerShell?

To avoid SQL Injection with varchar parameters you could use

function sqlExecuteRead($connectionString, $sqlCommand, $pars) {

    $connection = new-object system.data.SqlClient.SQLConnection($connectionString)
    $connection.Open()
    $command = new-object system.data.sqlclient.sqlcommand($sqlCommand, $connection)

    if ($pars -and $pars.Keys) {
        foreach($key in $pars.keys) {
            # avoid injection in varchar parameters
            $par = $command.Parameters.Add("@$key", [system.data.SqlDbType]::VarChar, 512);
            $par.Value = $pars[$key];
        }
    }

    $adapter = New-Object System.Data.sqlclient.sqlDataAdapter $command
    $dataset = New-Object System.Data.DataSet
    $adapter.Fill($dataset) | Out-Null
    $connection.Close()
    return $dataset.tables[0].rows

}

$connectionString = "connectionstringHere"
$sql = "select top 10 Message, TimeStamp, Level from dbo.log " +
    "where Message = @MSG and Level like @LEVEL"
$pars = @{
    MSG = 'this is a test from powershell'
    LEVEL = 'aaa%'
};
sqlExecuteRead $connectionString $sql $pars

Does Spring @Transactional attribute work on a private method?

The answer is no. Please see Spring Reference: Using @Transactional :

The @Transactional annotation may be placed before an interface definition, a method on an interface, a class definition, or a public method on a class

json_decode() expects parameter 1 to be string, array given

I think you want json_encode, not json_decode.

What does it mean: The serializable class does not declare a static final serialVersionUID field?

The other answers so far have a lot of technical information. I will try to answer, as requested, in simple terms.

Serialization is what you do to an instance of an object if you want to dump it to a raw buffer, save it to disk, transport it in a binary stream (e.g., sending an object over a network socket), or otherwise create a serialized binary representation of an object. (For more info on serialization see Java Serialization on Wikipedia).

If you have no intention of serializing your class, you can add the annotation just above your class @SuppressWarnings("serial").

If you are going to serialize, then you have a host of things to worry about all centered around the proper use of UUID. Basically, the UUID is a way to "version" an object you would serialize so that whatever process is de-serializing knows that it's de-serializing properly. I would look at Ensure proper version control for serialized objects for more information.

Mongoimport of json file

Just copy path of json file like example "C:\persons.json"
go to C:\Program Files\MongoDB\Server\4.2\bin
open cmd on that mongodb bin folder and run this command

mongoimport --jsonArray --db dbname--collection collectionName--file FilePath

example mongoimport --jsonArray --db learnmongo --collection persons --file C:\persons.json

numpy get index where value is true

You can use nonzero function. it returns the nonzero indices of the given input.

Easy Way

>>> (e > 15).nonzero()

(array([1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]), array([6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))

to see the indices more cleaner, use transpose method:

>>> numpy.transpose((e>15).nonzero())

[[1 6]
 [1 7]
 [1 8]
 [1 9]
 [2 0]
 ...

Not Bad Way

>>> numpy.nonzero(e > 15)

(array([1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]), array([6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))

or the clean way:

>>> numpy.transpose(numpy.nonzero(e > 15))

[[1 6]
 [1 7]
 [1 8]
 [1 9]
 [2 0]
 ...

Android Studio AVD - Emulator: Process finished with exit code 1

I had same issue for windows , the cause of the problem was currupted or missing dll files. I had to change them.

In android studio ,

Help Menu -> Show log in explorer.

It opens log folder, where you can find all logs . In my situation error like "Emulator terminated with exit code -1073741515"

Try to run emulator from command prompt ,

Go to folder ~\Android\Sdk\emulator

Run this command:

emulator.exe -netdelay none -netspeed full -avd <virtual device name> 

ex: emulator.exe -netdelay none -netspeed full -avd Nexus_5X_API_26.avd

You can find this command from folder ~.android\avd\xxx.avd\emu-launch-params.txt

If you get error about vcruntime140 ,

Search and download the appropriate vcruntime140.dll file for your system from the internet (32 / 64 bit version) , and replace it with the vcruntime140.dll file in the folder ~\Android\Sdk\emulator
Try step 1
If you get error about vcruntime140_1 , change the file name as vcruntime140_1.dll ,try step 1

If you get error about msvcp140.dll

Search and download the appropriate msvcp140.dll file for your system from the internet (32 / 64 bit version)
Replace the file in the folder C:\Windows\System32 with file msvcp140.dll
Try step 1

If it runs , you can run it from Android Studio also.

PHP file_get_contents() returns "failed to open stream: HTTP request failed!"

file_get_contents() utilizes the fopen() wrappers, therefore it is restricted from accessing URLs through the allow_url_fopen option within php.ini.

You will either need to alter your php.ini to turn this option on or use an alternative method, namely cURL - by far the most popular and, to be honest, standard way to accomplish what you are trying to do.

symfony2 : failed to write cache directory

Just use this acl cmd, next time the files inside var are created it will have the r/w/x permission for www-data user.

cd var 
rm -rf *
cd ..
setfacl -d -m u:www-data:rwx var

Cmd explanation:

setfacl -> Set acl command    
-d -> default behavior    
-m -> modify 
u:www-data: -> for user 
rwx -> adding permissions  
var -> on the folder

How to do a https request with bad certificate?

All of these answers are wrong! Do not use InsecureSkipVerify to deal with a CN that doesn't match the hostname. The Go developers unwisely were adamant about not disabling hostname checks (which has legitimate uses - tunnels, nats, shared cluster certs, etc), while also having something that looks similar but actually completely ignores the certificate check. You need to know that the certificate is valid and signed by a cert that you trust. But in common scenarios, you know that the CN won't match the hostname you connected with. For those, set ServerName on tls.Config. If tls.Config.ServerName == remoteServerCN, then the certificate check will succeed. This is what you want. InsecureSkipVerify means that there is NO authentication; and it's ripe for a Man-In-The-Middle; defeating the purpose of using TLS.

There is one legitimate use for InsecureSkipVerify: use it to connect to a host and grab its certificate, then immediately disconnect. If you setup your code to use InsecureSkipVerify, it's generally because you didn't set ServerName properly (it will need to come from an env var or something - don't belly-ache about this requirement... do it correctly).

In particular, if you use client certs and rely on them for authentication, you basically have a fake login that doesn't actually login any more. Refuse code that does InsecureSkipVerify, or you will learn what is wrong with it the hard way!

grep from tar.gz without extracting [faster one]

For starters, you could start more than one process:

tar -ztf file.tar.gz | while read FILENAME
do
        (if tar -zxf file.tar.gz "$FILENAME" -O | grep -l "string"
        then
                echo "$FILENAME contains string"
        fi) &
done

The ( ... ) & creates a new detached (read: the parent shell does not wait for the child) process.

After that, you should optimize the extracting of your archive. The read is no problem, as the OS should have cached the file access already. However, tar needs to unpack the archive every time the loop runs, which can be slow. Unpacking the archive once and iterating over the result may help here:

local tempPath=`tempfile`
mkdir $tempPath && tar -zxf file.tar.gz -C $tempPath &&
find $tempPath -type f | while read FILENAME
do
        (if grep -l "string" "$FILENAME"
        then
                echo "$FILENAME contains string"
        fi) &
done && rm -r $tempPath

find is used here, to get a list of files in the target directory of tar, which we're iterating over, for each file searching for a string.

Edit: Use grep -l to speed up things, as Jim pointed out. From man grep:

   -l, --files-with-matches
          Suppress normal output; instead print the name of each input file from which output would
          normally have been printed.  The scanning will stop on the first match.  (-l is specified
          by POSIX.)

How do you return the column names of a table?

set fmtonly on
select * from yourTable

JavaScript getElementByID() not working

Because when the script executes the browser has not yet parsed the <body>, so it does not know that there is an element with the specified id.

Try this instead:

<html>
<head>
    <title></title>
    <script type="text/javascript">
        window.onload = (function () {
            var refButton = document.getElementById("btnButton");

            refButton.onclick = function() {
                alert('Dhoor shala!');
            };
        });
    </script>
    </head>
<body>
    <form id="form1">
    <div>
        <input id="btnButton" type="button" value="Click me"/>
    </div>
</form>
</body>
</html>

Note that you may as well use addEventListener instead of window.onload = ... to make that function only execute after the whole document has been parsed.

Reason to Pass a Pointer by Reference in C++?

David's answer is correct, but if it's still a little abstract, here are two examples:

You might want to zero all freed pointers to catch memory problems earlier. C-style you'd do:

void freeAndZero(void** ptr)
{
    free(*ptr);
    *ptr = 0;
}

void* ptr = malloc(...);

...

freeAndZero(&ptr);

In C++ to do the same, you might do:

template<class T> void freeAndZero(T* &ptr)
{
    delete ptr;
    ptr = 0;
}

int* ptr = new int;

...

freeAndZero(ptr);

When dealing with linked-lists - often simply represented as pointers to a next node:
```
struct Node
{
    value_t value;
    Node* next;
};
```
In this case, when you insert to the empty list you necessarily must change the incoming pointer because the result is not the NULL pointer anymore. This is a case where you modify an external pointer from a function, so it would have a reference to pointer in its signature:
```
void insert(Node* &list)
{
    ...
    if(!list) list = new Node(...);
    ...
}
```

There's an example in this question.

Using --add-host or extra_hosts with docker-compose

Basic docker-compose.yml with extra hosts:

version: '3'
services:
api:
    build: .
    ports:
        - "5003:5003"
    extra_hosts:
        - "your-host.name.com:162.242.195.82" #host and ip
        - "your-host--1.name.com your-host--2.name.com:50.31.209.229" #multiple hostnames with same ip

The content in the /etc/hosts file in the created container:

162.242.195.82  your-host.name.com
50.31.209.229   your-host--1.name.com your-host--2.name.com

You can check the /etc/hosts file with the following commands:

$ docker-compose -f path/to/file/docker-compose.yml run api bash  # 'api' is service name
#then inside container bash
root@f7c436910676:/app# cat /etc/hosts

How can I replace the deprecated set_magic_quotes_runtime in php?

ini_set('magic_quotes_runtime', 0)

I guess.

How do I compare two Integers?

The Integer class implements Comparable<Integer>, so you could try,

x.compareTo(y) == 0

also, if rather than equality, you are looking to compare these integers, then,

x.compareTo(y) < 0 will tell you if x is less than y.

x.compareTo(y) > 0 will tell you if x is greater than y.

Of course, it would be wise, in these examples, to ensure that x is non-null before making these calls.

How do I print output in new line in PL/SQL?

dbms_output.put_line('Hi,');
dbms_output.put_line('good');
dbms_output.put_line('morning');
dbms_output.put_line('friends');

DBMS_OUTPUT.PUT_LINE('Hi, ' || CHR(13) || CHR(10) || 
                     'good' || CHR(13) || CHR(10) ||
                     'morning' || CHR(13) || CHR(10) ||
                     'friends' || CHR(13) || CHR(10) ||);

try it.

MySQL how to join tables on two fields

JOIN t2 ON (t2.id = t1.id AND t2.date = t1.date)

No module named _sqlite3

Try installing sqlite like this if you are using FreeBSD.

pkg install py27-sqlite3-2.7.10_6

How do I use HTML as the view engine in Express?

HTML files can be rendered using ejs engine:

app.set('view engine', 'ejs');

And make sure your files under "/views" are named with ".ejs".

For example "index.ejs".

Cannot assign requested address - possible causes?

Okay, my problem wasn't the port, but the binding address. My server has an internal address (10.0.0.4) and an external address (52.175.223.XX). When I tried connecting with:

$sock = @stream_socket_server('tcp://52.175.223.XX:123', $errNo, $errStr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN);

It failed because the local socket was 10.0.0.4 and not the external 52.175.223.XX. You can checkout the local available interfaces with sudo ifconfig.

Deleting specific rows from DataTable

<asp:GridView ID="grd_item_list" runat="server" AutoGenerateColumns="false" Width="100%" CssClass="table table-bordered table-hover" OnRowCommand="grd_item_list_RowCommand">
    <Columns>
        <asp:TemplateField HeaderText="No">
            <ItemTemplate>
                <%# Container.DataItemIndex + 1 %>
            </ItemTemplate>
        </asp:TemplateField>            
        <asp:TemplateField HeaderText="Actions">
            <ItemTemplate>                    
                <asp:Button ID="remove_itemIndex" OnClientClick="if(confirm('Are You Sure to delete?')==true){ return true;} else{ return false;}" runat="server" class="btn btn-primary" Text="REMOVE" CommandName="REMOVE_ITEM" CommandArgument='<%# Container.DataItemIndex+1 %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

 **This is the row binding event**

protected void grd_item_list_RowCommand(object sender, GridViewCommandEventArgs e) {

    item_list_bind_structure();

    if (ViewState["item_list"] != null)
        dt = (DataTable)ViewState["item_list"];


    if (e.CommandName == "REMOVE_ITEM") {
        var RowNum = Convert.ToInt32(e.CommandArgument.ToString()) - 1;

        DataRow dr = dt.Rows[RowNum];
        dr.Delete();

    }

    grd_item_list.DataSource = dt;
    grd_item_list.DataBind();
}

How to open this .DB file?

I don't think there is a way to tell which program to use from just the .db extension. It could even be an encrypted database which can't be opened. You can MS Access, or a sqlite manager.

Edit: Try to rename the file to .txt and open it with a text editor. The first couple of words in the file could tell you the DB Type.

If it is a SQLite database, it will start with "SQLite format 3"

Spring-Security-Oauth2: Full authentication is required to access this resource

You should pre authenticate the token apis "/oauth/token"

extend ResourceServerConfigurerAdapter and override configure function to do this.

eg:

http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and().authorizeRequests().antMatchers("/oauth/token").permitAll().
anyRequest().authenticated();

How to copy directories with spaces in the name

There is a bug in robocopy in interpreting the source name. If you include a back slash at the end of the path to describe a folder it keeps including the string for the source into the rest of the line. ie

robocopy "C:\back up\" %destination% /e Nothing here will go to the destination string

robocopy "C:\back up" %destination% /e but this works

I may be wrong but I think both should work!

How to add a "open git-bash here..." context menu to the windows explorer?

You can install git for windows or Github for windows , both give you the choice while installing to add this feature to your windows explorer. You can find it here:

Github for Windows

https://windows.github.com/

Git for Windows

http://git-scm.com/

Firebase TIMESTAMP to date and Time

Firebase.ServerValue.TIMESTAMP is not actual timestamp it is constant that will be replaced with actual value in server if you have it set into some variable.

mySessionRef.update({ startedAt: Firebase.ServerValue.TIMESTAMP });
mySessionRef.on('value', function(snapshot){ console.log(snapshot.val()) })
//{startedAt: 1452508763895}

if you want to get server time then you can use following code

  fb.ref("/.info/serverTimeOffset").on('value', function(offset) {
    var offsetVal = offset.val() || 0;
    var serverTime = Date.now() + offsetVal;
  });

Mongoose: CastError: Cast to ObjectId failed for value "[object Object]" at path "_id"

Had the same problem, I just coerced the id into a string.

My schema:

const product = new mongooseClient.Schema({
    retailerID: { type: mongoose.SchemaTypes.ObjectId, required: true, index: true }
});

And then, when inserting:

retailerID: `${retailer._id}`

Dynamically add data to a javascript map

Well any Javascript object functions sort-of like a "map"

randomObject['hello'] = 'world';

Typically people build simple objects for the purpose:

var myMap = {};

// ...

myMap[newKey] = newValue;

edit — well the problem with having an explicit "put" function is that you'd then have to go to pains to avoid having the function itself look like part of the map. It's not really a Javascripty thing to do.

13 Feb 2014 — modern JavaScript has facilities for creating object properties that aren't enumerable, and it's pretty easy to do. However, it's still the case that a "put" property, enumerable or not, would claim the property name "put" and make it unavailable. That is, there's still only one namespace per object.

Flexbox: how to get divs to fill up 100% of the container width without wrapping?

To prevent the flex items from shrinking, set the flex shrink factor to 0:

The flex shrink factor determines how much the flex item will shrink relative to the rest of the flex items in the flex container when negative free space is distributed. When omitted, it is set to 1.

.boxcontainer .box {
  flex-shrink: 0;
}

_x000D_

* {_x000D_
  box-sizing: border-box;_x000D_
}_x000D_
.wrapper {_x000D_
  width: 200px;_x000D_
  background-color: #EEEEEE;_x000D_
  border: 2px solid #DDDDDD;_x000D_
  padding: 1rem;_x000D_
}_x000D_
.boxcontainer {_x000D_
  position: relative;_x000D_
  left: 0;_x000D_
  border: 2px solid #BDC3C7;_x000D_
  transition: all 0.4s ease;_x000D_
  display: flex;_x000D_
}_x000D_
.boxcontainer .box {_x000D_
  width: 100%;_x000D_
  padding: 1rem;_x000D_
  flex-shrink: 0;_x000D_
}_x000D_
.boxcontainer .box:first-child {_x000D_
  background-color: #F47983;_x000D_
}_x000D_
.boxcontainer .box:nth-child(2) {_x000D_
  background-color: #FABCC1;_x000D_
}_x000D_
#slidetrigger:checked ~ .wrapper .boxcontainer {_x000D_
  left: -100%;_x000D_
}_x000D_
#overflowtrigger:checked ~ .wrapper {_x000D_
  overflow: hidden;_x000D_
}

_x000D_

<input type="checkbox" id="overflowtrigger" />_x000D_
<label for="overflowtrigger">Hide overflow</label><br />_x000D_
<input type="checkbox" id="slidetrigger" />_x000D_
<label for="slidetrigger">Slide!</label>_x000D_
<div class="wrapper">_x000D_
  <div class="boxcontainer">_x000D_
    <div class="box">_x000D_
      First bunch of content._x000D_
    </div>_x000D_
    <div class="box">_x000D_
      Second load  of content._x000D_
    </div>_x000D_
  </div>_x000D_
</div>

_x000D_

How can I see the specific value of the sql_mode?

You need to login to your mysql terminal first using mysql -u username -p password

Then use this:

SELECT @@sql_mode; or SELECT @@GLOBAL.sql_mode;

output will be like this:

STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,NO_ENGINE_SUB

You can also set sql mode by this:

SET GLOBAL sql_mode=TRADITIONAL;

How to do date/time comparison

For comparison between two times use time.Sub()

// utc life
loc, _ := time.LoadLocation("UTC")

// setup a start and end time
createdAt := time.Now().In(loc).Add(1 * time.Hour)
expiresAt := time.Now().In(loc).Add(4 * time.Hour)

// get the diff
diff := expiresAt.Sub(createdAt)
fmt.Printf("Lifespan is %+v", diff)

The program outputs:

Lifespan is 3h0m0s

http://play.golang.org/p/bbxeTtd4L6

BigDecimal setScale and round

One important point that is alluded to but not directly addressed is the difference between "precision" and "scale" and how they are used in the two statements. "precision" is the total number of significant digits in a number. "scale" is the number of digits to the right of the decimal point.

The MathContext constructor only accepts precision and RoundingMode as arguments, and therefore scale is never specified in the first statement.

setScale() obviously accepts scale as an argument, as well as RoundingMode, however precision is never specified in the second statement.

If you move the decimal point one place to the right, the difference will become clear:

// 1.
new BigDecimal("35.3456").round(new MathContext(4, RoundingMode.HALF_UP));
//result = 35.35
// 2.
new BigDecimal("35.3456").setScale(4, RoundingMode.HALF_UP);
// result = 35.3456

How to run (not only install) an android application using .apk file?

When you start the app from the GUI, adb logcat might show you the corresponding action/category/component:

$ adb logcat
[...]
I/ActivityManager( 1607): START {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.android.browser/.BrowserActivity} from pid 1792
[...]

How to add Drop-Down list (<select>) programmatically?

var sel = document.createElement('select');
sel.name = 'drop1';
sel.id = 'Select1';

var cars = [
  "volvo",
  "saab",
  "mercedes",
  "audi"
];

var options_str = "";

cars.forEach( function(car) {
  options_str += '<option value="' + car + '">' + car + '</option>';
});

sel.innerHTML = options_str;


window.onload = function() {
  document.body.appendChild(sel);
};

SQL Server Express 2008 Install Side-by-side w/ SQL 2005 Express Fails

Simply remove the Microsoft SQL Server Management Studio Express 2005 from control panel

Get UTC time and local time from NSDate object

I found an easier way to get UTC in Swift4. Put this code in playground

let date = Date() 
*//"Mar 15, 2018 at 4:01 PM"*

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZZ"
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)

let newDate = dateFormatter.string(from: date) 
*//"2018-03-15 21:05:04 +0000"*

jQuery toggle animation

I dont think adding dual functions inside the toggle function works for a registered click event (Unless I'm missing something)

For example:

$('.btnName').click(function() {
 top.$('#panel').toggle(function() {
   $(this).animate({ 
     // style change
   }, 500);
   },
   function() {
   $(this).animate({ 
     // style change back
   }, 500);
 });

How to load data from a text file in a PostgreSQL database?

There's Pgloader that uses the aforementioned COPY command and which can load data from csv (and MySQL, SQLite and dBase). It's also using separate threads for reading and copying data, so it's quite fast (interestingly enough, it got written from Python to Common Lisp and got a 20 to 30x speed gain, see blog post).

To load the csv file one needs to write a little configuration file, like

LOAD CSV  
  FROM 'path/to/file.csv' (x, y, a, b, c, d)  
  INTO postgresql:///pgloader?csv (a, b, d, c)  
  …

How do you turn a Mongoose document into a plain object?

Mongoose Models inherit from Documents, which have a toObject() method. I believe what you're looking for should be the result of doc.toObject().

http://mongoosejs.com/docs/api.html#document_Document-toObject

In log4j, does checking isDebugEnabled before logging improve performance?

In Java 8, you don't have to use isDebugEnabled() to improve the performance.

https://logging.apache.org/log4j/2.0/manual/api.html#Java_8_lambda_support_for_lazy_logging

import java.util.logging.Logger;
...
Logger.getLogger("hello").info(() -> "Hello " + name);

Vim clear last search highlighting

Any solution by nohlsearch is not prefered, what about next search? The best answer is created by let @/ = "", but I do not like map by function key on mac, so here is mine:

let mapleader=','
let g:mapleader=','
nnoremap <leader>cs :let @/ = ""<cr>

Accessing Session Using ASP.NET Web API

I had this same problem in asp.net mvc, I fixed it by putting this method in my base api controller that all my api controllers inherit from:

    /// <summary>
    /// Get the session from HttpContext.Current, if that is null try to get it from the Request properties.
    /// </summary>
    /// <returns></returns>
    protected HttpContextWrapper GetHttpContextWrapper()
    {
      HttpContextWrapper httpContextWrapper = null;
      if (HttpContext.Current != null)
      {
        httpContextWrapper = new HttpContextWrapper(HttpContext.Current);
      }
      else if (Request.Properties.ContainsKey("MS_HttpContext"))
      {
        httpContextWrapper = (HttpContextWrapper)Request.Properties["MS_HttpContext"];
      }
      return httpContextWrapper;
    }

Then in your api call that you want to access the session you just do:

HttpContextWrapper httpContextWrapper = GetHttpContextWrapper();
var someVariableFromSession = httpContextWrapper.Session["SomeSessionValue"];

I also have this in my Global.asax.cs file like other people have posted, not sure if you still need it using the method above, but here it is just in case:

/// <summary>
/// The following method makes Session available.
/// </summary>
protected void Application_PostAuthorizeRequest()
{
  if (HttpContext.Current.Request.AppRelativeCurrentExecutionFilePath.StartsWith("~/api"))
  {
    HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
  }
}

You could also just make a custom filter attribute that you can stick on your api calls that you need session, then you can use session in your api call like you normally would via HttpContext.Current.Session["SomeValue"]:

  /// <summary>
  /// Filter that gets session context from request if HttpContext.Current is null.
  /// </summary>
  public class RequireSessionAttribute : ActionFilterAttribute
  {
    /// <summary>
    /// Runs before action
    /// </summary>
    /// <param name="actionContext"></param>
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
      if (HttpContext.Current == null)
      {
        if (actionContext.Request.Properties.ContainsKey("MS_HttpContext"))
        {
          HttpContext.Current = ((HttpContextWrapper)actionContext.Request.Properties["MS_HttpContext"]).ApplicationInstance.Context;
        }
      }
    }
  }

Hope this helps.

Checking from shell script if a directory contains files

ZSH

I know the question was marked for bash; but, just for reference, for zsh users:

Test for non-empty directory

To check if foo is non-empty:

$ for i in foo(NF) ; do ... ; done

where, if foo is non-empty, the code in the for block will be executed.

Test for empty directory

To check if foo is empty:

$ for i in foo(N/^F) ; do ... ; done

where, if foo is empty, the code in the for block will be executed.

Notes

We did not need to quote the directory foo above, but we can do so if we need to:

$ for i in 'some directory!'(NF) ; do ... ; done

We can also test more than one object, even if it is not a directory:

$ mkdir X     # empty directory
$ touch f     # regular file
$ for i in X(N/^F) f(N/^F) ; do echo $i ; done  # echo empty directories
X

Anything that is not a directory will just be ignored.

Extras

Since we are globbing, we can use any glob (or brace expansion):

$ mkdir X X1 X2 Y Y1 Y2 Z
$ touch Xf                    # create regular file
$ touch X1/f                  # directory X1 is not empty
$ touch Y1/.f                 # directory Y1 is not empty
$ ls -F                       # list all objects
X/ X1/ X2/ Xf Y/ Y1/ Y2/ Z/
$ for i in {X,Y}*(N/^F); do printf "$i "; done; echo  # print empty directories
X X2 Y Y2

We can also examine objects that are placed in an array. With the directories as above, for example:

$ ls -F                       # list all objects
X/ X1/ X2/ Xf Y/ Y1/ Y2/ Z/
$ arr=(*)                     # place objects into array "arr"
$ for i in ${^arr}(N/^F); do printf "$i "; done; echo
X X2 Y Y2 Z

Thus, we can test objects that may already be set in an array parameter.

Note that the code in the for block is, obviously, executed on every directory in turn. If this is not desirable then you can simply populate an array parameter and then operate on that parameter:

$ for i in *(NF) ; do full_directories+=($i) ; done
$ do_something $full_directories

Explanation

For zsh users there is the (F) glob qualifier (see man zshexpn), which matches "full" (non-empty) directories:

$ mkdir X Y
$ touch Y/.f        # Y is now not empty
$ touch f           # create a regular file
$ ls -dF *          # list everything in the current directory
f X/ Y/
$ ls -dF *(F)       # will list only "full" directories
Y/

The qualifier (F) lists objects that match: is a directory AND is not empty. So, (^F) matches: not a directory OR is empty. Thus, (^F) alone would also list regular files, for example. Thus, as explained on the zshexp man page, we also need the (/) glob qualifier, which lists only directories:

$ mkdir X Y Z
$ touch X/f Y/.f    # directories X and Y now not empty
$ for i in *(/^F) ; do echo $i ; done
Z

Thus, to check if a given directory is empty, you can therefore run:

$ mkdir X
$ for i in X(/^F) ; do echo $i ; done ; echo "finished"
X
finished

and just to be sure that a non-empty directory would not be captured:

$ mkdir Y
$ touch Y/.f
$ for i in Y(/^F) ; do echo $i ; done ; echo "finished"
zsh: no matches found: Y(/^F)
finished

Oops! Since Y is not empty, zsh finds no matches for (/^F) ("directories that are empty") and thus spits out an error message saying that no matches for the glob were found. We therefore need to suppress these possible error messages with the (N) glob qualifier:

$ mkdir Y
$ touch Y/.f
$ for i in Y(N/^F) ; do echo $i ; done ; echo "finished"
finished

Thus, for empty directories we need the qualifier (N/^F), which you can read as: "don't warn me about failures, directories that are not full".

Similarly, for non-empty directories we need the qualifier (NF), which we can likewise read as: "don't warn me about failures, full directories".

calling another method from the main method in java

You can do it multiple ways. Here are two. Cheers!

package learningjava;

public class helloworld {
    public static void main(String[] args) {
        new helloworld().go();
        // OR
        helloworld.get();
    }

    public void go(){
        System.out.println("Hello World");
    }
    public static void get(){
        System.out.println("Hello World, Again");
    }
}

Initializing default values in a struct

An explicit default initialization can help:

struct foo {
    bool a {};
    bool b {};
    bool c {};
 } bar;

Behavior bool a {} is same as bool b = bool(); and return false.

How to kill an Android activity when leaving it so that it cannot be accessed from the back button?

You just need to call finish()

Intent intent = new Intent(this, NextActivity.class);
startActivity(intent);
finish();

How can I check if a value is of type Integer?

You can use modulus %, the solution is so simple:

import java.text.DecimalFormat;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);
    System.out.println("Enter first number");
    Double m = scan.nextDouble();
    System.out.println("Enter second number");
    Double n= scan.nextDouble();

    if(m%n==0) 
    {
        System.out.println("Integer");
    }
    else
    {
        System.out.println("Double");
    }


}
}

Get week of year in JavaScript like in PHP

Here is my implementation for calculating the week number in JavaScript. corrected for summer and winter time offsets as well. I used the definition of the week from this article: ISO 8601

Weeks are from mondays to sunday, and january 4th is always in the first week of the year.

// add get week prototype functions
// weeks always start from monday to sunday
// january 4th is always in the first week of the year
Date.prototype.getWeek = function () {
    year = this.getFullYear();
    var currentDotw = this.getWeekDay();
    if (this.getMonth() == 11 && this.getDate() - currentDotw > 28) {
        // if true, the week is part of next year 
        return this.getWeekForYear(year + 1);
    }
    if (this.getMonth() == 0 && this.getDate() + 6 - currentDotw < 4) {
        // if true, the week is part of previous year
        return this.getWeekForYear(year - 1);
    }
    return this.getWeekForYear(year);
}

// returns a zero based day, where monday = 0
// all weeks start with monday
Date.prototype.getWeekDay = function () {
    return  (this.getDay() + 6) % 7;
}

// corrected for summer/winter time
Date.prototype.getWeekForYear = function (year) {
    var currentDotw = this.getWeekDay();
    var fourjan = new Date(year, 0, 4);
    var firstDotw = fourjan.getWeekDay();
    var dayTotal = this.getDaysDifferenceCorrected(fourjan) // the difference in days between the two dates.
    // correct for the days of the week
    dayTotal += firstDotw; // the difference between the current date and the first monday of the first week, 
    dayTotal -= currentDotw; // the difference between the first monday and the current week's monday
    // day total should be a multiple of 7 now
    var weeknumber = dayTotal / 7 + 1; // add one since it gives a zero based week number.
    return weeknumber;
}

// corrected for timezones and offset
Date.prototype.getDaysDifferenceCorrected = function (other) {
    var millisecondsDifference = (this - other);
    // correct for offset difference. offsets are in minutes, the difference is in milliseconds
    millisecondsDifference += (other.getTimezoneOffset()- this.getTimezoneOffset()) * 60000;
    // return day total. 1 day is 86400000 milliseconds, floor the value to return only full days
    return Math.floor(millisecondsDifference / 86400000);
}

for testing i used the following JavaScript tests in Qunit

var runweekcompare = function(result, expected) {
    equal(result, expected,'Week nr expected value: ' + expected + ' Actual value: ' + result);
}

test('first week number test', function () {
    expect(5);
    var temp = new Date(2016, 0, 4); // is the monday of the first week of the year
    runweekcompare(temp.getWeek(), 1);
    var temp = new Date(2016, 0, 4, 23, 50); // is the monday of the first week of the year
    runweekcompare(temp.getWeek(), 1);
    var temp = new Date(2016, 0, 10, 23, 50); // is the sunday of the first week of the year
    runweekcompare(temp.getWeek(), 1);
    var temp = new Date(2016, 0, 11, 23, 50); // is the second week of the year
    runweekcompare(temp.getWeek(), 2);
    var temp = new Date(2016, 1, 29, 23, 50); // is the 9th week of the year
    runweekcompare(temp.getWeek(), 9);
});

test('first day is part of last years last week', function () {
    expect(2);
    var temp = new Date(2016, 0, 1, 23, 50); // is the first last week of the previous year
    runweekcompare(temp.getWeek(), 53);
    var temp = new Date(2011, 0, 2, 23, 50); // is the first last week of the previous year
    runweekcompare(temp.getWeek(), 52);
});

test('last  day is part of next years first week', function () {
    var temp = new Date(2013, 11, 30); // is part of the first week of 2014
    runweekcompare(temp.getWeek(), 1);
});

test('summer winter time change', function () {
    expect(2);
    var temp = new Date(2000, 2, 26); 
    runweekcompare(temp.getWeek(), 12);
    var temp = new Date(2000, 2, 27); 
    runweekcompare(temp.getWeek(), 13);
});

test('full 20 year test', function () {
    //expect(20 * 12 * 28 * 2);
    for (i = 2000; i < 2020; i++) {
        for (month = 0; month < 12; month++) {
            for (day = 1; day < 29 ; day++) {
                var temp = new Date(i, month, day);
                var expectedweek = temp.getWeek();
                var temp2 = new Date(i, month, day, 23, 50);
                var resultweek = temp.getWeek();
                equal(expectedweek, Math.round(expectedweek), 'week number whole number expected ' + Math.round(expectedweek) + ' resulted week nr ' + expectedweek);
                equal(resultweek, expectedweek, 'Week nr expected value: ' + expectedweek + ' Actual value: ' + resultweek + ' for year ' + i + ' month ' + month + ' day ' + day);
            }
        }
    }
});

How to make use of SQL (Oracle) to count the size of a string?

You can use LENGTH() for CHAR / VARCHAR2 and DBMS_LOB.GETLENGTH() for CLOB. Both functions will count actual characters (not bytes).

See the linked documentation if you do need bytes.

Display a tooltip over a button using Windows Forms

The .NET framework provides a ToolTip class. Add one of those to your form and then on the MouseHover event for each item you would like a tooltip for, do something like the following:

private void checkBox1_MouseHover(object sender, EventArgs e)
{
    toolTip1.Show("text", checkBox1);
}

List Git commits not pushed to the origin yet

how to determine if a commit with particular hash have been pushed to the origin already?

# list remote branches that contain $commit
git branch -r --contains $commit

How to get first object out from List<Object> using Linq

[0] or .First() will give you the same performance whatever happens.
But your Dictionary could contains IEnumerable<Component> instead of List<Component>, and then you cant use the [] operator. That is where the difference is huge.

So for your example, it doesn't really matters, but for this code, you have no choice to use First():

var dic = new Dictionary<String, IEnumerable<Component>>();
foreach (var components in dic.Values)
{
    // you can't use [0] because components is an IEnumerable<Component>
    var firstComponent = components.First(); // be aware that it will throw an exception if components is empty.
    var depCountry = firstComponent.ComponentValue("Dep");
}

Cannot find module cv2 when using OpenCV

I solved my issue using the following command :

conda install opencv

Creating all possible k combinations of n items in C++

Behind the link below is a generic C# answer to this problem: How to format all combinations out of a list of objects. You can limit the results only to the length of k pretty easily.

https://stackoverflow.com/a/40417765/2613458

Get time in milliseconds using C#

long milliseconds = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;

This is actually how the various Unix conversion methods are implemented in the DateTimeOffset class (.NET Framework 4.6+, .NET Standard 1.3+):

long milliseconds = DateTimeOffset.Now.ToUnixTimeMilliseconds();

Java: How to split a string by a number of characters?

Print array without brackets and commas

I used join() function like:

i=new Array("Hi", "Hello", "Cheers", "Greetings");
i=i.join("");

Which Prints:
HiHelloCheersGreetings

See more: Javascript Join - Use Join to Make an Array into a String in Javascript

Android: android.content.res.Resources$NotFoundException: String resource ID #0x5

You are assigning a numeric value to a text field. You have to convert the numeric value to a string with:

String.valueOf(variable)

Finding the median of an unsorted array

I have already upvoted the @dasblinkenlight answer since the Median of Medians algorithm in fact solves this problem in O(n) time. I only want to add that this problem could be solved in O(n) time by using heaps also. Building a heap could be done in O(n) time by using the bottom-up. Take a look to the following article for a detailed explanation Heap sort

Supposing that your array has N elements, you have to build two heaps: A MaxHeap that contains the first N/2 elements (or (N/2)+1 if N is odd) and a MinHeap that contains the remaining elements. If N is odd then your median is the maximum element of MaxHeap (O(1) by getting the max). If N is even, then your median is (MaxHeap.max()+MinHeap.min())/2 this takes O(1) also. Thus, the real cost of the whole operation is the heaps building operation which is O(n).

BTW this MaxHeap/MinHeap algorithm works also when you don't know the number of the array elements beforehand (if you have to resolve the same problem for a stream of integers for e.g). You can see more details about how to resolve this problem in the following article Median Of integer streams

Programs & Examples On #Default constraint

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Create XML in Javascript

Unsupported method: BaseConfig.getApplicationIdSuffix()

How to save local data in a Swift app?

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