SyntaxFix

Programs & Examples On #Qtreewidgetitem

The QTreeWidgetItem class, part of the Qt framework, provides an item for use with the QTreeWidget class.

Getting the 'external' IP address in Java

I am not sure if you can grab that IP from code that runs on the local machine.

You can however build code that runs on a website, say in JSP, and then use something that returns the IP of where the request came from:

request.getRemoteAddr()

Or simply use already-existing services that do this, then parse the answer from the service to find out the IP.

Use a webservice like AWS and others

import java.net.*;
import java.io.*;

URL whatismyip = new URL("http://checkip.amazonaws.com");
BufferedReader in = new BufferedReader(new InputStreamReader(
                whatismyip.openStream()));

String ip = in.readLine(); //you get the IP as a String
System.out.println(ip);

Angular 2 optional route parameter

Facing a similar problem with lazy loading I have done this:

const routes: Routes = [
  {
    path: 'users',
    redirectTo: 'users/',
    pathMatch: 'full'
  },
  {
    path: 'users',
    loadChildren: './users/users.module#UserssModule',
    runGuardsAndResolvers: 'always'
  },
[...]

And then in the component:

  ngOnInit() {
    this.activatedRoute.paramMap.pipe(
      switchMap(
        (params: ParamMap) => {
          let id: string = params.get('id');
          if (id == "") {
            return of(undefined);
          }
          return this.usersService.getUser(Number(params.get('id')));
        }
      )
    ).subscribe(user => this.selectedUser = user);
  }

This way:

  • The route without / is redirected to the route with. Because of the pathMatch: 'full', only such specific full route is redirected.

  • Then, users/:id is received. If the actual route was users/, id is "", so check it in ngOnInit and act accordingly; else, id is the id and proceed.

  • The rest of the componect acts on selectedUser is or not undefined (*ngIf and the things like that).

SQL: How to to SUM two values from different tables

you can also try this in sql-server !!

select a.city,a.total + b.total as mytotal from [dbo].[cash] a join [dbo].[cheque] b on a.city=b.city

demo

or try using sum,union 

select sum(total)  as mytotal,city
from
(
    select * from cash union
    select * from cheque
) as vij
group by city

How to get a unique device ID in Swift?

For Swift 3.X Latest Working Code, Easily usage;

   let deviceID = UIDevice.current.identifierForVendor!.uuidString
   print(deviceID)

How to dynamically change header based on AngularJS partial view?

Custom event-based solution

Here is another approach that hasn't been mentioned by the others here (as of this writing).

You can use custom events like so:

// your index.html template
<html ng-app="app">
<head>
<title ng-bind="pageTitle">My App</title>

// your main app controller that is declared on the <html> element
app.controller('AppController', function($scope) {
    $scope.$on('title-updated', function(newTitle) {
        $scope.pageTitle = newTitle;
    });
});

// some controller somewhere deep inside your app
mySubmodule.controller('SomeController', function($scope, dynamicService) {
    $scope.$emit('title-updated', dynamicService.title);
});

This approach has the advantage of not requiring extra services to be written and then injected into every controller that needs to set the title, and also doesn't (ab)use the $rootScope. It also allows you to set a dynamic title (as in the code example), which is not possible using custom data attributes on the router's config object (as far as I know at least).

How do I format a number to a dollar amount in PHP

PHP also has money_format().

Here's an example:

echo money_format('$%i', 3.4); // echos '$3.40'

This function actually has tons of options, go to the documentation I linked to to see them.

Note: money_format is undefined in Windows.

UPDATE: Via the PHP manual: https://www.php.net/manual/en/function.money-format.php

WARNING: This function [money_format] has been DEPRECATED as of PHP 7.4.0. Relying on this function is highly discouraged.

Instead, look into NumberFormatter::formatCurrency. 

    $number = "123.45";
    $formatter = new NumberFormatter('en_US', NumberFormatter::CURRENCY);
    return $formatter->formatCurrency($number, 'USD');

Converting JSON to XML in Java

If you have a valid dtd file for the xml then you can easily transform json to xml and xml to json using the eclipselink jar binary.

Refer this: http://www.cubicrace.com/2015/06/How-to-convert-XML-to-JSON-format.html

The article also has a sample project (including the supporting third party jars) as a zip file which can be downloaded for reference purpose.

MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)

This also happens when your password contains some special characters like @,$,etc. To avoid this situation you can wrap password in single quotes:

$ mysql -usomeuser -p's0mep@$$w0Rd'

Or instead don't use password while entering. Leave it blank and then type it when terminal asks. This is the recommended way.

$ mysql -usomeuser -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 191
Server version: 5.5.46-0ubuntu0.14.04.2 (Ubuntu)

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

SQL Server Case Statement when IS NULL

I agree with Joachim that you should replace the hyphen with NULL. But, if you really do want a hyphen, convert the date to a string:

(CASE WHEN B.[STAT] IS NULL
      THEN convert(varchar(10), C.[EVENT DATE]+10, 121)
      ELSE '-'
 END) AS [DATE]

Also, the distinct is unnecessary in your select statement. The group by already does this for you.

How to delete file from public folder in laravel 5.1

First make sure the file exist by building the path

if($request->hasFile('image')){
    $path = storage_path().'/app/public/YOUR_FOLDER/'.$db->image;
      if(File::exists($path)){
          unlink($path);
      }

Why do I get "Procedure expects parameter '@statement' of type 'ntext/nchar/nvarchar'." when I try to use sp_executesql?

The solution is to put an N in front of both the type and the SQL string to indicate it is a double-byte character string:

DECLARE @SQL NVARCHAR(100) 
SET @SQL = N'SELECT TOP 1 * FROM sys.tables' 
EXECUTE sp_executesql @SQL

How to normalize a 2-dimensional numpy array in python less verbose?

 
normed_matrix = normalize(input_data, axis=1, norm='l1')
print(normed_matrix)

where input_data is the name of your 2D array

Why does the 'int' object is not callable error occur when using the sum() function?

You probably redefined your "sum" function to be an integer data type. So it is rightly telling you that an integer is not something you can pass a range.

To fix this, restart your interpreter.

Python 2.7.3 (default, Apr 20 2012, 22:44:07) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> data1 = range(0, 1000, 3)
>>> data2 = range(0, 1000, 5)
>>> data3 = list(set(data1 + data2)) # makes new list without duplicates
>>> total = sum(data3) # calculate sum of data3 list's elements
>>> print total
233168

If you shadow the sum builtin, you can get the error you are seeing

>>> sum = 0
>>> total = sum(data3) # calculate sum of data3 list's elements
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable

Also, note that sum will work fine on the set there is no need to convert it to a list

What is the difference between 'my' and 'our' in Perl?

Just try to use the following program :

#!/usr/local/bin/perl
use feature ':5.10';
#use warnings;
package a;
{
my $b = 100;
our $a = 10;


print "$a \n";
print "$b \n";
}

package b;

#my $b = 200;
#our $a = 20 ;

print "in package b value of  my b $a::b \n";
print "in package b value of our a  $a::a \n";

How to install a previous exact version of a NPM package?

It's quite easy. Just write this, for example:

npm install -g [email protected]

Or:

npm install -g npm@latest    // For the last stable version
npm install -g npm@next      // For the most recent release

How do you install Boost on MacOS?

you can download bjam for OSX (or any other OS) here

Python3 integer division

Try this:

a = 1
b = 2
int_div  = a // b

Using jQuery to see if a div has a child with a certain class

Use the children funcion of jQuery.

$("#text-field").keydown(function(event) {
    if($('#popup').children('p.filled-text').length > 0) {
        console.log("Found");
     }
});

$.children('').length will return the count of child elements which match the selector.

Delete a row from a SQL Server table

 
private void DeleteProductButton_Click(object sender, EventArgs e)
{


    string ProductID = deleteProductButton.Text;
    if (string.IsNullOrEmpty(ProductID))
    {
        MessageBox.Show("Please enter valid ProductID");
        deleteProductButton.Focus();
    }
    try
    {
        string SelectDelete = "Delete from Products where ProductID=" + deleteProductButton.Text;
        SqlCommand command = new SqlCommand(SelectDelete, Conn);
        command.CommandType = CommandType.Text;
        command.CommandTimeout = 15;

        DialogResult comfirmDelete = MessageBox.Show("Are you sure you want to delete this record?");
        if (comfirmDelete == DialogResult.No)
        {
            return;
        }
    }
    catch (Exception Ex)
    {
        MessageBox.Show(Ex.Message);

    }
}

Adding a UISegmentedControl to UITableView

 
   self.tableView.tableHeaderView = segmentedControl;

If you want it to obey your width and height properly though enclose your segmentedControl in a UIView first as the tableView likes to mangle your view a bit to fit the width.

enter image description here enter image description here

"Mixed content blocked" when running an HTTP AJAX operation in an HTTPS page

For laravel 8 in local it was ok but in production I had the problem. To solve it I used POST method and removed a simple slash at final of url. I changed it from:

/my/url/

to:

/my/url

and it works.

I don't know the reason. Perhaps somebody could explain it.

Using scanner.nextLine()

Rather than placing an extra scanner.nextLine() each time you want to read something, since it seems you want to accept each input on a new line, you might want to instead changing the delimiter to actually match only newlines (instead of any whitespace, as is the default)

import java.util.Scanner;

class ScannerTest {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        scanner.useDelimiter("\\n");

        System.out.print("Enter an index: ");
        int index = scanner.nextInt();

        System.out.print("Enter a sentence: ");
        String sentence = scanner.next();

        System.out.println("\nYour sentence: " + sentence);
        System.out.println("Your index: " + index);
    }
}

Thus, to read a line of input, you only need scanner.next() that has the same behavior delimiter-wise of next{Int, Double, ...}

The difference with the "nextLine() every time" approach, is that the latter will accept, as an index also <space>3, 3<space> and 3<space>whatever while the former only accepts 3 on a line on its own

MySQL, update multiple tables with one query

You can also do this with one query too using a join like so:

UPDATE table1,table2 SET table1.col=a,table2.col2=b
WHERE items.id=month.id;

And then just send this one query, of course. You can read more about joins here: http://dev.mysql.com/doc/refman/5.0/en/join.html. There's also a couple restrictions for ordering and limiting on multiple table updates you can read about here: http://dev.mysql.com/doc/refman/5.0/en/update.html (just ctrl+f "join").

The ScriptManager must appear before any controls that need it
  • with a head tag with runat="server"
  • inside a form tag with runat="server"
  • before the ContentPanels that contain controls that require it - typical controls with UpdatePanels:

<%=PageTitle%> 

</form>
 </body>

How to force a WPF binding to refresh?

Try using BindingExpression.UpdateTarget()

Couldn't connect to server 127.0.0.1:27017

This Works for me To stop the mongodb use:

use admin
db.shutdownServer()

And to Restart: 

sudo service mongod restart

How to join multiple collections with $lookup in mongodb

The join feature supported by Mongodb 3.2 and later versions. You can use joins by using aggregate query.
You can do it using below example : 

db.users.aggregate([

    // Join with user_info table
    {
        $lookup:{
            from: "userinfo",       // other table name
            localField: "userId",   // name of users table field
            foreignField: "userId", // name of userinfo table field
            as: "user_info"         // alias for userinfo table
        }
    },
    {   $unwind:"$user_info" },     // $unwind used for getting data in object or for one record only

    // Join with user_role table
    {
        $lookup:{
            from: "userrole", 
            localField: "userId", 
            foreignField: "userId",
            as: "user_role"
        }
    },
    {   $unwind:"$user_role" },

    // define some conditions here 
    {
        $match:{
            $and:[{"userName" : "admin"}]
        }
    },

    // define which fields are you want to fetch
    {   
        $project:{
            _id : 1,
            email : 1,
            userName : 1,
            userPhone : "$user_info.phone",
            role : "$user_role.role",
        } 
    }
]);

This will give result like this:

{
    "_id" : ObjectId("5684f3c454b1fd6926c324fd"),
    "email" : "[email protected]",
    "userName" : "admin",
    "userPhone" : "0000000000",
    "role" : "admin"
}

Hope this will help you or someone else.

Thanks

Adding delay between execution of two following lines

I have a couple of turn-based games where I need the AI to pause before taking its turn (and between steps in its turn). I'm sure there are other, more useful, situations where a delay is the best solution. In Swift: 

        let delay = 2.0 * Double(NSEC_PER_SEC) 
        let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay)) 
        dispatch_after(time, dispatch_get_main_queue()) { self.playerTapped(aiPlayView) }

I just came back here to see if the Objective-C calls were different.(I need to add this to that one, too.)

not finding android sdk (Unity)

I solved the problem by uninstalling JDK 9.

PHP Check for NULL

Use is_null or === operator.

is_null($result['column'])

$result['column'] === NULL

Standard concise way to copy a file in Java?

Available as standard in Java 7, path.copyTo: http://openjdk.java.net/projects/nio/javadoc/java/nio/file/Path.html http://java.sun.com/docs/books/tutorial/essential/io/copy.html

I can't believe it took them so long to standardise something so common and simple as file copying :(

Remove array element based on object property

jAndy's solution is probably best, but if you can't rely on filter you could do something like:

var myArray = [
    {field: 'id', operator: 'eq', value: 'id'}, 
    {field: 'cStatus', operator: 'eq', value: 'cStatus'}, 
    {field: 'money', operator: 'eq', value: "money"}
];

myArray.remove_key = function(key){
    var i = 0, 
        keyval = null;
    for( ; i < this.length; i++){
        if(this[i].field == key){
            keyval = this.splice(i, 1);
            break;
        }
    }
    return keyval;
}

How to use a PHP class from another file?

Use include_once instead.
This error means that you have already included this file.

include_once(LIB.'/class.php');

Convert String value format of YYYYMMDDHHMMSS to C# DateTime

You have to use a custom parsing string. I also suggest to include the invariant culture to identify that this format does not relate to any culture. Plus, it will prevent a warning in some code analysis tools.

var date = DateTime.ParseExact(value, "yyyyMMddHHmmss", CultureInfo.InvariantCulture);

Error in if/while (condition) {: missing Value where TRUE/FALSE needed

The evaluation of condition resulted in an NA. The if conditional must have either a TRUE or FALSE result. 

if (NA) {}
## Error in if (NA) { : missing value where TRUE/FALSE needed

This can happen accidentally as the results of calculations:

if(TRUE && sqrt(-1)) {}
## Error in if (TRUE && sqrt(-1)) { : missing value where TRUE/FALSE needed

To test whether an object is missing use is.na(x) rather than x == NA.

See also the related errors:

Error in if/while (condition) { : argument is of length zero

Error in if/while (condition) : argument is not interpretable as logical

if (NULL) {}
## Error in if (NULL) { : argument is of length zero

if ("not logical") {}
## Error: argument is not interpretable as logical

if (c(TRUE, FALSE)) {}
## Warning message:
## the condition has length > 1 and only the first element will be used

Add Variables to Tuple

It's as easy as the following:

info_1 = "one piece of info"
info_2 = "another piece"
vars = (info_1, info_2)
# 'vars' is now a tuple with the values ("info_1", "info_2")

However, tuples in Python are immutable, so you cannot append variables to a tuple once it is created.

Counting no of rows returned by a select query

 
select COUNT(*)
from Monitor as m
    inner join Monitor_Request as mr on mr.Company_ID=m.Company_id
    group by m.Company_id
    having COUNT(m.Monitor_id)>=5

IsNull function in DB2 SQL?

 
Select Product.ID, VALUE(product.Name, "Internal") AS ProductName from Product

How to get hex color value rather than RGB value?

 
var hexDigits = new Array
        ("0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"); 

//Function to convert rgb color to hex format
function rgb2hex(rgb) {
 rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
 return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}

function hex(x) {
  return isNaN(x) ? "00" : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
 }

(Source)

Sorting arraylist in alphabetical order (case insensitive)

Custom Comparator should help

Collections.sort(list, new Comparator<String>() {
    @Override
    public int compare(String s1, String s2) {
        return s1.compareToIgnoreCase(s2);
    }
});

Or if you are using Java 8:

list.sort(String::compareToIgnoreCase);

Can I export a variable to the environment from a bash script without sourcing it?

The answer is no, but for me I did the following

the script: myExport

#! \bin\bash
export $1

an alias in my .bashrc

alias myExport='source myExport'

Still you source it, but maybe in this way it is more useable and it is interesting for someone else.

Path.Combine absolute with relative path strings

 

Path.GetFullPath(@"c:\windows\temp\..\system32")?

How to remove files that are listed in the .gitignore but still on the repository?

I can't say it's an appropriate solution but you can try this.

Steps

  • I am hoping that you have already cloned your repo.
  • Now copy the file somewhere outside of your project.
  • Add that filename with a location in gitigonre file.
  • Remove that file from your local project.
  • Push your code to remote origin.
  • And now add that copied file into your project it'll be ignored.

This is just a hack solution if you want to maintain the history and don't to create mass in it.

If you don't want to use this solution please kindly ignore and try to avoid devote it. Because I am really trying to increase my score on this side

Fastest way to determine if an integer's square root is an integer

For performance, you very often have to do some compromsies. Others have expressed various methods, however, you noted Carmack's hack was faster up to certain values of N. Then, you should check the "n" and if it is less than that number N, use Carmack's hack, else use some other method described in the answers here.

Split string into list in jinja?

After coming back to my own question after 5 year and seeing so many people found this useful, a little update.

A string variable can be split into a list by using the split function (it can contain similar values, set is for the assignment) . I haven't found this function in the official documentation but it works similar to normal Python. The items can be called via an index, used in a loop or like Dave suggested if you know the values, it can set variables like a tuple.

{% set list1 = variable1.split(';') %}
The grass is {{ list1[0] }} and the boat is {{ list1[1] }}

or

{% set list1 = variable1.split(';') %}
{% for item in list1 %}
    <p>{{ item }}<p/>
{% endfor %}

or 

{% set item1, item2 = variable1.split(';') %}
The grass is {{ item1 }} and the boat is {{ item2 }}

Why do I get access denied to data folder when using adb?

There are two things to remember if you want to browse everything on your device.

  1. You need to have a phone with root access in order to browse the data folder on an Android phone. That means either you have a developer device (ADP1 or an ION from Google I/O) or you've found a way to 'root' your phone some other way.
  2. You need to be running ADB in root mode, do this by executing: adb root

How to search for occurrences of more than one space between words in a line

Search for [ ]{2,}. This will find two or more adjacent spaces anywhere within the line. It will also match leading and trailing spaces as well as lines that consist entirely of spaces. If you don't want that, check out Alexander's answer.

Actually, you can leave out the brackets, they are just for clarity (otherwise the space character that is being repeated isn't that well visible :)).

The problem with \s{2,} is that it will also match newlines on Windows files (where newlines are denoted by CRLF or \r\n which is matched by \s{2}.

If you also want to find multiple tabs and spaces, use [ \t]{2,}.

How to view files in binary from bash?

Hexyl formats nicely: sudo apt install hexyl

enter image description here

replacing NA's with 0's in R dataframe

 
dataset <- matrix(sample(c(NA, 1:5), 25, replace = TRUE), 5);
data <- as.data.frame(dataset)

[,1] [,2] [,3] [,4] [,5] 
[1,]    2    3    5    5    4
[2,]    2    4    3    2    4
[3,]    2   NA   NA   NA    2
[4,]    2    3   NA    5    5
[5,]    2    3    2    2    3

data[is.na(data)] <- 0

Echo tab characters in bash script

Using echo to print values of variables is a common Bash pitfall. Reference link:

http://mywiki.wooledge.org/BashPitfalls#echo_.24foo

How to get value by key from JObject?

Try this:

private string GetJArrayValue(JObject yourJArray, string key)
{
    foreach (KeyValuePair<string, JToken> keyValuePair in yourJArray)
    {
        if (key == keyValuePair.Key)
        {
            return keyValuePair.Value.ToString();
        }
    }
}

Stop absolutely positioned div from overlapping text

Could you add z-index style to the two sections so that the one you want appears on top?

How to use class from other files in C# with visual studio?

I was having the same problem here. Found out that the problem was with an Advanced Property of the file. There is there an option with the name 'Compilation Action' (may be not with the exact words, I am translating - my VS is in Portuguese).

My Class1.cs file was there as "Content" and I just had to change it to "Compile" to make it work, and have the classes recognized by the others files in the same project.

How do I clone a Django model instance object and save it to the database?

There is a package that can do this which creates a UI within the django admin site: https://github.com/RealGeeks/django-modelclone

pip install django-modelclone

Add "modelclone" to INSTALLED_APPS and import it within admin.py.

Then, whenever you want to make a model clonable, you just replace "admin.ModelAdmin" in the given admin model class "modelclone.ClonableModelAdmin". This results in a "Duplicate" button appearing within the instance details page for that given model.

How to redirect a url in NGINX

First make sure you have installed Nginx with the HTTP rewrite module. To install this we need to have pcre-library

How to install pcre library

If the above mentioned are done or if you already have them, then just add the below code in your nginx server block

  if ($host !~* ^www\.) {
    rewrite ^(.*)$ http://www.$host$1 permanent;
  }

To remove www from every request you can use

  if ($host = 'www.your_domain.com' ) {
   rewrite  ^/(.*)$  http://your_domain.com/$1  permanent;
  }

so your server block will look like

  server {
            listen       80;
            server_name  test.com;
            if ($host !~* ^www\.) {
                    rewrite ^(.*)$ http://www.$host$1 permanent;
            }
            client_max_body_size   10M;
            client_body_buffer_size   128k;

            root       /home/test/test/public;
            passenger_enabled on;
            rails_env production;

            error_page   500 502 503 504  /50x.html;
            location = /50x.html {
                    root   html;
            }
    }

Portable way to check if directory exists [Windows/Linux, C]

stat() works on Linux., UNIX and Windows as well:

#include <sys/types.h>
#include <sys/stat.h>

struct stat info;

if( stat( pathname, &info ) != 0 )
    printf( "cannot access %s\n", pathname );
else if( info.st_mode & S_IFDIR )  // S_ISDIR() doesn't exist on my windows 
    printf( "%s is a directory\n", pathname );
else
    printf( "%s is no directory\n", pathname );

What is the proper way to re-throw an exception in C#?

I know this is an old question, but I'm going to answer it because I have to disagree with all the answers here.

Now, I'll agree that most of the time you either want to do a plain throw, to preserve as much information as possible about what went wrong, or you want to throw a new exception that may contain that as an inner-exception, or not, depending on how likely you are to want to know about the inner events that caused it.

There is an exception though. There are several cases where a method will call into another method and a condition that causes an exception in the inner call should be considered the same exception on the outer call.

One example is a specialised collection implemented by using another collection. Let's say it's a DistinctList<T> that wraps a List<T> but refuses duplicate items.

If someone called ICollection<T>.CopyTo on your collection class, it might just be a straight call to CopyTo on the inner collection (if say, all the custom logic only applied to adding to the collection, or setting it up). Now, the conditions in which that call would throw are exactly the same conditions in which your collection should throw to match the documentation of ICollection<T>.CopyTo.

Now, you could just not catch the execption at all, and let it pass through. Here though the user gets an exception from List<T> when they were calling something on a DistinctList<T>. Not the end of the world, but you may want to hide those implementation details.

Or you could do your own checking:

public CopyTo(T[] array, int arrayIndex)
{
  if(array == null)
    throw new ArgumentNullException("array");
  if(arrayIndex < 0)
    throw new ArgumentOutOfRangeException("arrayIndex", "Array Index must be zero or greater.");
  if(Count > array.Length + arrayIndex)
    throw new ArgumentException("Not enough room in array to copy elements starting at index given.");
  _innerList.CopyTo(array, arrayIndex);
}

That's not the worse code because it's boilerplate and we can probably just copy it from some other implementation of CopyTo where it wasn't a simple pass-through and we had to implement it ourselves. Still, it's needlessly repeating the exact same checks that are going to be done in _innerList.CopyTo(array, arrayIndex), so the only thing it has added to our code is 6 lines where there could be a bug.

We could check and wrap:

public CopyTo(T[] array, int arrayIndex)
{
  try
  {
    _innerList.CopyTo(array, arrayIndex);
  }
  catch(ArgumentNullException ane)
  {
    throw new ArgumentNullException("array", ane);
  }
  catch(ArgumentOutOfRangeException aore)
  {
    throw new ArgumentOutOfRangeException("Array Index must be zero or greater.", aore);
  }
  catch(ArgumentException ae)
  {
    throw new ArgumentException("Not enough room in array to copy elements starting at index given.", ae);
  }
}

In terms of new code added that could potentially be buggy, this is even worse. And we don't gain a thing from the inner exceptions. If we pass a null array to this method and receive an ArgumentNullException, we're not going to learn anything by examining the inner exception and learning that a call to _innerList.CopyTo was passed a null array and threw an ArgumentNullException.

Here, we can do everything we want with:

public CopyTo(T[] array, int arrayIndex)
{
  try
  {
    _innerList.CopyTo(array, arrayIndex);
  }
  catch(ArgumentException ae)
  {
    throw ae;
  }
}

Every one of the exceptions that we expect to have to throw if the user calls it with incorrect arguments, will correctly be thrown by that re-throw. If there's a bug in the logic used here, it's in one of two lines - either we were wrong in deciding this was a case where this approach works, or we were wrong in having ArgumentException as the exception type looked for. It's the only two bugs that the catch block can possibly have.

Now. I still agree that most of the time you either want a plain throw; or you want to construct your own exception to more directly match the problem from the perspective of the method in question. There are cases like the above where re-throwing like this makes more sense, and there are plenty of other cases. E.g. to take a very different example, if an ATOM file reader implemented with a FileStream and an XmlTextReader receives a file error or invalid XML, then it will perhaps want to throw exactly the same exception it received from those classes, but it should look to the caller that it is AtomFileReader that is throwing a FileNotFoundException or XmlException, so they might be candidates for similarly re-throwing.

Edit:

We can also combine the two:

public CopyTo(T[] array, int arrayIndex)
{
  try
  {
    _innerList.CopyTo(array, arrayIndex);
  }
  catch(ArgumentException ae)
  {
    throw ae;
  }
  catch(Exception ex)
  {
    //we weren't expecting this, there must be a bug in our code that put
    //us into an invalid state, and subsequently let this exception happen.
    LogException(ex);
    throw;
  }
}

Why is exception.printStackTrace() considered bad practice?

Printing the exception's stack trace in itself doesn't constitute bad practice, but only printing the stace trace when an exception occurs is probably the issue here -- often times, just printing a stack trace is not enough.

Also, there's a tendency to suspect that proper exception handling is not being performed if all that is being performed in a catch block is a e.printStackTrace. Improper handling could mean at best an problem is being ignored, and at worst a program that continues executing in an undefined or unexpected state.

Example

Let's consider the following example:

try {
  initializeState();

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

continueProcessingAssumingThatTheStateIsCorrect();

Here, we want to do some initialization processing before we continue on to some processing that requires that the initialization had taken place.

In the above code, the exception should have been caught and properly handled to prevent the program from proceeding to the continueProcessingAssumingThatTheStateIsCorrect method which we could assume would cause problems.

In many instances, e.printStackTrace() is an indication that some exception is being swallowed and processing is allowed to proceed as if no problem every occurred.

Why has this become a problem?

Probably one of the biggest reason that poor exception handling has become more prevalent is due to how IDEs such as Eclipse will auto-generate code that will perform a e.printStackTrace for the exception handling:

try {
  Thread.sleep(1000);
} catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
}

(The above is an actual try-catch auto-generated by Eclipse to handle an InterruptedException thrown by Thread.sleep.)

For most applications, just printing the stack trace to standard error is probably not going to be sufficient. Improper exception handling could in many instances lead to an application running in a state that is unexpected and could be leading to unexpected and undefined behavior.

Create table with jQuery - append

I wrote rather good function that can generate vertical and horizontal tables:

function generateTable(rowsData, titles, type, _class) {
    var $table = $("<table>").addClass(_class);
    var $tbody = $("<tbody>").appendTo($table);


    if (type == 2) {//vertical table
        if (rowsData.length !== titles.length) {
            console.error('rows and data rows count doesent match');
            return false;
        }
        titles.forEach(function (title, index) {
            var $tr = $("<tr>");
            $("<th>").html(title).appendTo($tr);
            var rows = rowsData[index];
            rows.forEach(function (html) {
                $("<td>").html(html).appendTo($tr);
            });
            $tr.appendTo($tbody);
        });

    } else if (type == 1) {//horsantal table 
        var valid = true;
        rowsData.forEach(function (row) {
            if (!row) {
                valid = false;
                return;
            }

            if (row.length !== titles.length) {
                valid = false;
                return;
            }
        });

        if (!valid) {
            console.error('rows and data rows count doesent match');
            return false;
        }

        var $tr = $("<tr>");
        titles.forEach(function (title, index) {
            $("<th>").html(title).appendTo($tr);
        });
        $tr.appendTo($tbody);

        rowsData.forEach(function (row, index) {
            var $tr = $("<tr>");
            row.forEach(function (html) {
                $("<td>").html(html).appendTo($tr);
            });
            $tr.appendTo($tbody);
        });
    }

    return $table;
}

usage example:

var title = [
    '????? ?????',
    '????? ?????????',
    '????? ?? ???'
];

var rows = [
    [number_format(data.source.area,2)],
    [number_format(data.intersection.area,2)],
    [number_format(data.deference.area,2)]
];

var $ft = generateTable(rows, title, 2,"table table-striped table-hover table-bordered");

$ft.appendTo( GroupAnalyse.$results );

var title = [
    '???',
    '?????? ????',
    '?????? ????',
    '?????',
    '????? ??? ?????',
];

var rows = data.edgesData.map(function (r) {
    return [
        r.directionText,
        r.lineLength,
        r.newLineLength,
        r.stateText,
        r.lineLengthDifference
    ];
});


var $et = generateTable(rows, title, 1,"table table-striped table-hover table-bordered");

$et.appendTo( GroupAnalyse.$results );

$('<hr/>').appendTo( GroupAnalyse.$results );

example result:

example result

SSL "Peer Not Authenticated" error with HttpClient 4.1

 
keytool -import -v -alias cacerts -keystore cacerts.jks -storepass changeit -file C:\cacerts.cer

Confirm deletion using Bootstrap 3 modal box

You can use Bootbox dialog boxes

$(document).ready(function() {

  $('#btnDelete').click(function() {
    bootbox.confirm("Are you sure want to delete?", function(result) {
      alert("Confirm result: " + result);
    });
  });
});

Plunker Demo

Cannot import scipy.misc.imread

If you have Pillow installed with scipy and it is still giving you error then check your scipy version because it has been removed from scipy since 1.3.0rc1.

rather install scipy 1.1.0 by :

pip install scipy==1.1.0

check https://github.com/scipy/scipy/issues/6212

The method imread in scipy.misc requires the forked package of PIL named Pillow. If you are having problem installing the right version of PIL try using imread in other packages:

from matplotlib.pyplot import imread
im = imread(image.png)

To read jpg images without PIL use:

import cv2 as cv
im = cv.imread(image.jpg)

You can try from scipy.misc.pilutil import imread instead of from scipy.misc import imread

Please check the GitHub page : https://github.com/amueller/mglearn/issues/2 for more details.

How to get item's position in a list?

Just to illustrate complete example along with the input_list which has searies1 (example: input_list[0]) in which you want to do a lookup of series2 (example: input_list[1]) and get indexes of series2 if it exists in series1.

Note: Your certain condition will go in lambda expression if conditions are simple

input_list = [[1,2,3,4,5,6,7],[1,3,7]]
series1 = input_list[0]
series2 = input_list[1]
idx_list = list(map(lambda item: series1.index(item) if item in series1 else None, series2))
print(idx_list)

output:

[0, 2, 6]

VB.Net .Clear() or txtbox.Text = "" textbox clear methods

The Clear method is defined as

    public void Clear() { 
        Text = null;
    }

The Text property's setter starts with

        set { 
            if (value == null) { 
                value = "";
            }

I assume this answers your question.

Declaring functions in JSP?

You need to enclose that in <%! %> as follows:

<%!

public String getQuarter(int i){
String quarter;
switch(i){
        case 1: quarter = "Winter";
        break;

        case 2: quarter = "Spring";
        break;

        case 3: quarter = "Summer I";
        break;

        case 4: quarter = "Summer II";
        break;

        case 5: quarter = "Fall";
        break;

        default: quarter = "ERROR";
}

return quarter;
}

%>

You can then invoke the function within scriptlets or expressions:

<%
     out.print(getQuarter(4));
%>

or

<%= getQuarter(17) %>

How do I configure Maven for offline development?

If you have a PC with internet access in your LAN, you should install a local Maven repository.

I recommend Artifactory Open Source. This is what we use in our organization, it is really easy to setup.

Artifactory acts as a proxy between your build tool (Maven, Ant, Ivy, Gradle etc.) and the outside world.

It caches remote artifacts so that you don’t have to download them over and over again.

It blocks unwanted (and sometimes security-sensitive) external requests for internal artifacts and controls how and where artifacts are deployed, and by whom.

After setting up Artifactory you just need to change Maven's settings.xml in the development machines:

<?xml version="1.0" encoding="UTF-8"?>
<settings xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd" xmlns="http://maven.apache.org/SETTINGS/1.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <mirrors>
    <mirror>
      <mirrorOf>*</mirrorOf>
      <name>repo</name>
      <url>http://maven.yourorganization.com:8081/artifactory/repo</url>
      <id>repo</id>
    </mirror>
  </mirrors>
  <profiles>
    <profile>
      <repositories>
        <repository>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
          <id>central</id>
          <name>libs-release</name>
          <url>http://maven.yourorganization.com:8081/artifactory/libs-release</url>
        </repository>
        <repository>
          <snapshots />
          <id>snapshots</id>
          <name>libs-snapshot</name>
          <url>http://maven.yourorganization.com:8081/artifactory/libs-snapshot</url>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <snapshots>
            <enabled>false</enabled>
          </snapshots>
          <id>central</id>
          <name>plugins-release</name>
          <url>http://maven.yourorganization.com:8081/artifactory/plugins-release</url>
        </pluginRepository>
        <pluginRepository>
          <snapshots />
          <id>snapshots</id>
          <name>plugins-snapshot</name>
          <url>http://maven.yourorganization.com:8081/artifactory/plugins-snapshot</url>
        </pluginRepository>
      </pluginRepositories>
      <id>artifactory</id>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>artifactory</activeProfile>
  </activeProfiles>
</settings>

We used this solution because we had problems with internet access in our development machines and some artifacts downloaded corrupted files or didn't download at all. We haven't had problems since.

Regular Expression for any number greater than 0?

You can use the below expression:

(^\d*\.?\d*[1-9]+\d*$)|(^[1-9]+\.?\d*$)

Valid entries: 1 1. 1.1 1.0 all positive real numbers

Invalid entries: all negative real numbers and 0 and 0.0

jQuery find file extension (from string)

 
var fileName = 'file.txt';

// Getting Extension

var ext = fileName.split('.')[1];

// OR

var ext = fileName.split('.').pop();

How can I change the color of AlertDialog title and the color of the line under it

This will set the color for the title, icon, and divider. Bound to change with any new Android version.

public static void colorAlertDialogTitle(AlertDialog dialog, int color) {
    int dividerId = dialog.getContext().getResources().getIdentifier("android:id/titleDivider", null, null);
    if (dividerId != 0) {
        View divider = dialog.findViewById(dividerId);
        divider.setBackgroundColor(color);
    }

    int textViewId = dialog.getContext().getResources().getIdentifier("android:id/alertTitle", null, null);
    if (textViewId != 0) {
        TextView tv = (TextView) dialog.findViewById(textViewId);
        tv.setTextColor(color);
    }

    int iconId = dialog.getContext().getResources().getIdentifier("android:id/icon", null, null);
    if (iconId != 0) {
        ImageView icon = (ImageView) dialog.findViewById(iconId);
        icon.setColorFilter(color);
    }
}

Remember to call dialog.show() before calling this method.

Laravel Request::all() Should Not Be Called Statically

use the request() helper instead. You don't have to worry about use statements and thus this sort of problem wont happen again.

$input = request()->all();

simple

Is it possible to change a UIButtons background color?

Well I'm 99% percent positive that you cannot just go and change the background color of a UIButton. Instead you have to go and change the background images yourself which I think is a pain. I'm amazed that I had to do this.

If I'm wrong or if theres a better way without having to set background images please let me know

[random setBackgroundImage:[UIImage imageNamed:@"toggleoff.png"] forState:UIControlStateNormal];
    [random setTitleColor:[UIColor darkTextColor] forState:UIControlStateNormal];


[random setBackgroundImage:[UIImage imageNamed:@"toggleon.png"] forState:UIControlStateNormal];
    [random setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

WCF - How to Increase Message Size Quota

Don't forget that the app.config of the execution entry point will be considered, not the one in class library project managing Web-Service calls if there is one.

For example if you get the error while running unit test, you need to set up appropriate config in the testing project.

Disable HTTP OPTIONS, TRACE, HEAD, COPY and UNLOCK methods in IIS

For anyone looking for a UI option using IIS Manager.

  1. Open the Website in IIS Manager
  2. Go To Request Filtering and open the Request Filtering Window.
  3. Go to Verbs Tab and Add HTTP Verbs to "Allow Verb..." or "Deny Verb...". This allow to add the HTTP Verbs in the "Deny Verb.." Collection.

Request Filtering Window in IIS Manager Request Filtering Window in IIS Manager

Add Verb... or Deny Verb... enter image description here

How to convert char to int?

An extension of some other answers that covers hexadecimal representation:

public int CharToInt(char c) 
{
    if (c >= '0' && c <= '9') 
    {
        return c - '0';
    }
    else if (c >= 'a' && c <= 'f') 
    {
        return 10 + c - 'a';
    }
    else if (c >= 'A' && c <= 'F') 
    {
        return 10 + c - 'A';
    }

    return -1;
}

Understanding Matlab FFT example

1) Why does the x-axis (frequency) end at 500? How do I know that there aren't more frequencies or are they just ignored?

It ends at 500Hz because that is the Nyquist frequency of the signal when sampled at 1000Hz. Look at this line in the Mathworks example:

f = Fs/2*linspace(0,1,NFFT/2+1);

The frequency axis of the second plot goes from 0 to Fs/2, or half the sampling frequency. The Nyquist frequency is always half the sampling frequency, because above that, aliasing occurs: Aliasing illustration

The signal would "fold" back on itself, and appear to be some frequency at or below 500Hz.

2) How do I know the frequencies are between 0 and 500? Shouldn't the FFT tell me, in which limits the frequencies are?

Due to "folding" described above (the Nyquist frequency is also commonly known as the "folding frequency"), it is physically impossible for frequencies above 500Hz to appear in the FFT; higher frequencies will "fold" back and appear as lower frequencies.

Does the FFT only return the amplitude value without the frequency?

Yes, the MATLAB FFT function only returns one vector of amplitudes. However, they map to the frequency points you pass to it.

Let me know what needs clarification so I can help you further.

What is the difference between window, screen, and document in Javascript?

The window is the actual global object.

The screen is the screen, it contains properties about the user's display.

The document is where the DOM is.

How to unzip a file using the command line?

7-Zip, it's open source, free and supports a wide range of formats.

7z.exe x myarchive.zip

How do I load an url in iframe with Jquery

 
$("#frame").click(function () { 
    this.src="http://www.google.com/";
});

Sometimes plain JavaScript is even cooler and faster than jQuery ;-)

Symfony2 and date_default_timezone_get() - It is not safe to rely on the system's timezone settings

add this code to Your AppKernel Class:

public function init()
{
    date_default_timezone_set('Asia/Tehran');
    parent::init();
}

Detect if the app was launched/opened from a push notification

When app is terminated, and user taps on push notification

public func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
   if launchOptions?[UIApplicationLaunchOptionsKey.remoteNotification] != nil {
      print("from push")
    }
}

When app is in background, and user taps on push notificaion

If the user opens your app from the system-displayed alert, the system may call this method again when your app is about to enter the foreground so that you can update your user interface and display information pertaining to the notification.

public func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
  if application.applicationState == .inactive {
    print("from push")
  }
}

Depending on your app, it can also send you silent push with content-available inside aps, so be aware of this as well :) See https://stackoverflow.com/a/33778990/1418457

The server committed a protocol violation. Section=ResponseStatusLine ERROR

Try putting this in your app/web.config:

<system.net>
    <settings>
        <httpWebRequest useUnsafeHeaderParsing="true" />
    </settings>
</system.net>

If this doesn't work you may also try setting the KeepAlive property to false.

Scatter plots in Pandas/Pyplot: How to plot by category

You can use df.plot.scatter, and pass an array to c= argument defining the color of each point: 

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
df = pd.DataFrame(np.random.normal(10,1,30).reshape(10,3), index = pd.date_range('2010-01-01', freq = 'M', periods = 10), columns = ('one', 'two', 'three'))
df['key1'] = (4,4,4,6,6,6,8,8,8,8)
colors = np.where(df["key1"]==4,'r','-')
colors[df["key1"]==6] = 'g'
colors[df["key1"]==8] = 'b'
print(colors)
df.plot.scatter(x="one",y="two",c=colors)
plt.show()

enter image description here

Performance of Java matrix math libraries?

Building on Varkhan's post that Pentium-specific native code would do better:

What does iterator->second mean?

The type of the elements of an std::map (which is also the type of an expression obtained by dereferencing an iterator of that map) whose key is K and value is V is std::pair<const K, V> - the key is const to prevent you from interfering with the internal sorting of map values.

std::pair<> has two members named first and second (see here), with quite an intuitive meaning. Thus, given an iterator i to a certain map, the expression:

i->first

Which is equivalent to:

(*i).first

Refers to the first (const) element of the pair object pointed to by the iterator - i.e. it refers to a key in the map. Instead, the expression:

i->second

Which is equivalent to:

(*i).second

Refers to the second element of the pair - i.e. to the corresponding value in the map.

How to set up file permissions for Laravel?

The permissions for the storage and vendor folders should stay at 775, for obvious security reasons.

However, both your computer and your server Apache need to be able to write in these folders. Ex: when you run commands like php artisan, your computer needs to write in the logs file in storage.

All you need to do is to give ownership of the folders to Apache : 

sudo chown -R www-data:www-data /path/to/your/project/vendor
sudo chown -R www-data:www-data /path/to/your/project/storage

Then you need to add your computer (referenced by it's username) to the group to which the server Apache belongs. Like so : 

sudo usermod -a -G www-data userName

NOTE: Most frequently, groupName is www-data but in your case, replace it with _www

Way to read first few lines for pandas dataframe

I think you can use the nrows parameter. From the docs:

nrows : int, default None

    Number of rows of file to read. Useful for reading pieces of large files

which seems to work. Using one of the standard large test files (988504479 bytes, 5344499 lines):

In [1]: import pandas as pd

In [2]: time z = pd.read_csv("P00000001-ALL.csv", nrows=20)
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00 s

In [3]: len(z)
Out[3]: 20

In [4]: time z = pd.read_csv("P00000001-ALL.csv")
CPU times: user 27.63 s, sys: 1.92 s, total: 29.55 s
Wall time: 30.23 s

VBA Go to last empty row

This does it:

Do
   c = c + 1
Loop While Cells(c, "A").Value <> ""

'prints the last empty row
Debug.Print c

Download image with JavaScript

As @Ian explained, the problem is that jQuery's click() is not the same as the native one.

Therefore, consider using vanilla-js instead of jQuery:

var a = document.createElement('a');
a.href = "img.png";
a.download = "output.png";
document.body.appendChild(a);
a.click();
document.body.removeChild(a);

Demo

What is stdClass in PHP?

If you wanted to quickly create a new object to hold some data about a book. You would do something like this:

$book = new stdClass;
$book->title = "Harry Potter and the Prisoner of Azkaban";
$book->author = "J. K. Rowling";
$book->publisher = "Arthur A. Levine Books";
$book->amazon_link = "http://www.amazon.com/dp/0439136369/";

Please check the site - http://www.webmaster-source.com/2009/08/20/php-stdclass-storing-data-object-instead-array/ for more details.

Date only from TextBoxFor()

TL;DR;

@Html.TextBoxFor(m => m.DOB,"{0:yyyy-MM-dd}", new { type = "date" })

Applying [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:yyyy-MM-dd}")] didn't work out for me!

Explanation:

The date of an html input element of type date must be formatted in respect to ISO8601, which is: yyyy-MM-dd

The displayed date is formatted based on the locale of the user's browser, but the parsed value is always formatted yyyy-mm-dd.

My experience is, that the language is not determined by the Accept-Language header, but by either the browser display language or OS system language.

In order to display a date property of your model using Html.TextBoxFor:

enter image description here

Date property of your model class:

public DateTime DOB { get; set; }

Nothing else is needed on the model side.


In Razor you do:

@Html.TextBoxFor(m => m.DOB,"{0:yyyy-MM-dd}", new { type = "date" })

What is a unix command for deleting the first N characters of a line?

I think awk would be the best tool for this as it can both filter and perform the necessary string manipulation functions on filtered lines:

tail -f logfile | awk '/org.springframework/ {print substr($0, 6)}'

or

tail -f logfile | awk '/org.springframework/ && sub(/^.{5}/,"",$0)'

Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

You only want to use Invoke or BeginInvoke for the bare minimum piece of work required to change the UI. Your "heavy" method should execute on another thread (e.g. via BackgroundWorker) but then using Control.Invoke/Control.BeginInvoke just to update the UI. That way your UI thread will be free to handle UI events etc.

See my threading article for a WinForms example - although the article was written before BackgroundWorker arrived on the scene, and I'm afraid I haven't updated it in that respect. BackgroundWorker merely simplifies the callback a bit.

Python: avoiding pylint warnings about too many arguments

I do not like referring to the number, the sybolic name is much more expressive and avoid having to add a comment that could become obsolete over time.

So I'd rather do:

#pylint: disable-msg=too-many-arguments

And I would also recommend to not leave it dangling there: it will stay active until the file ends or it is disabled, whichever comes first.

So better doing:

#pylint: disable-msg=too-many-arguments
code_which_would_trigger_the_msg
#pylint: enable-msg=too-many-arguments

I would also recommend enabling/disabling one single warning/error per line.

How to change href of <a> tag on button click through javascript

 
<a href="#" id="a" onclick="ChangeHref()">1.Change 2.Go</a>

<script>
function ChangeHref(){
document.getElementById("a").setAttribute("onclick", "location.href='http://religiasatanista.ro'");
}
</script>

Modifying a subset of rows in a pandas dataframe

Use .loc for label based indexing:

df.loc[df.A==0, 'B'] = np.nan

The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.:

df.loc[df.A==0, 'B'] = df.loc[df.A==0, 'B'] / 2

I don't know enough about pandas internals to know exactly why that works, but the basic issue is that sometimes indexing into a DataFrame returns a copy of the result, and sometimes it returns a view on the original object. According to documentation here, this behavior depends on the underlying numpy behavior. I've found that accessing everything in one operation (rather than [one][two]) is more likely to work for setting.

Calling constructors in c++ without new

Quite simply, both lines create the object on the stack, rather than on the heap as 'new' does. The second line actually involves a second call to a copy constructor, so it should be avoided (it also needs to be corrected as indicated in the comments). You should use the stack for small objects as much as possible since it is faster, however if your objects are going to survive for longer than the stack frame, then it's clearly the wrong choice.

Create an application setup in visual studio 2013

Visual Studio 2013 now supports setup projects. Microsoft have shipped a Visual Studio extension to produce setup projects.

Visual Studio Installer Projects Extension

How can I easily convert DataReader to List<T>?

I've covered this in a pet project.. use what you want.

Note that the ListEx implements the IDataReader interface.


people = new ListExCommand(command)
.Map(p=> new ContactPerson()
{
  Age = p.GetInt32(p.GetOrdinal("Age")),
  FirstName = p.GetString(p.GetOrdinal("FirstName")),
  IdNumber = p.GetInt64(p.GetOrdinal("IdNumber")),
  Surname = p.GetString(p.GetOrdinal("Surname")),
  Email = "[email protected]"
})
.ToListEx()
.Where("FirstName", "Peter");

Or use object mapping like in the following example.


people = new ListExAutoMap(personList)
.Map(p => new ContactPerson()
{
    Age = p.Age,
    FirstName = p.FirstName,
    IdNumber = p.IdNumber,
    Surname = p.Surname,
    Email = "[email protected]"
})
.ToListEx()
.Where(contactPerson => contactPerson.FirstName == "Zack");

Have a look at http://caprisoft.codeplex.com

$_POST not working. "Notice: Undefined index: username..."

undefined index means that somewhere in the $_POST array, there isn't an index (key) for the key username.

You should be setting your posted values into variables for a more clean solution, and it's a good habit to get into.

If I was having a similar error, I'd do something like this:

$username = $_POST['username']; // you should really do some more logic to see if it's set first
echo $username;

If username didn't turn up, that'd mean I was screwing up somewhere. You can also,

var_dump($_POST);

To see what you're posting. var_dump is really useful as far as debugging. Check it out: var_dump

UIScrollView Scrollable Content Size Ambiguity

It's answer for my self-answered question UIScrollView + Centered View + Ambigous Scrollable Content Size + many iPhone sizes.

But it fully cover your case too!

So, here is the initial state for simplest case:

  1. scrollView with 0 constraints to all edges
  2. Button centered Horizontal and Vertical with fixed Width and Height constraints
  3. And, of course - annoying warnings Has ambiguous scrollable content width and Has ambiguous scrollable content height.

1

All, that we have to do is:

  • Add 2 additional constraints, for example "0" for trailing and/or bottom space for our view (look at the example on screenshot below).

Important: you have to add trailing and/or bottom constraints. Not "leading and top" - it's not works!

2

You can check it in my example project, that demonstrating how to fix this issue.

P.S.

According logic - this action should cause "conflicting constraints". But no!

I don't know why it works and how Xcode detects which constraint is more prioritised (because I'm not set priority for these constraints explicity). I'll be thankful if someone explain, why it works in comments below.

How to retrieve data from sqlite database in android and display it in TextView

First cast your Edit text like this: 

TextView tekst = (TextView) findViewById(R.id.editText1);
tekst.setText(text);

And after that close the DB not befor this line...

 myDataBaseHelper.close();

What is the difference between application server and web server?

IBM makes a really nice comparison between the two:

By strict definition, a web server is a common subset of an application server.

A web server delivers static web content—e.g., HTML pages, files, images, video—primarily in response to hypertext transfer protocol (HTTP) requests from a web browser.

An application server typically can deliver web content too, but its primary job is to enable interaction between end-user clients and server-side application code—the code representing what is often called business logic—to generate and deliver dynamic content, such as transaction results, decision support, or real-time analytics. The client for an application server can be the application’s own end-user UI, a web browser, or a mobile app, and the client-server interaction can occur via any number of communication protocols.

In practice, however, the line between web servers and application servers has become fuzzier, particularly as the web browser has emerged as the application client of choice and as user expectations of web applications and web application performance have grown.

Most web servers support plug-ins for scripting languages (e.g., ASP, JSP, PHP, Perl) that enable the web server to generate dynamic content based on server-side logic. And an increasing number of application servers not only incorporate web server capabilities, but use HTTP as their primary protocol and support other protocols (e.g., CGI and CGI variants) for interfacing with web servers. They also allow web applications to leverage services like reverse proxy, clustering, redundancy, and load balancing—services that improve performance and reliability and allow developers to focus less on infrastructure and more on coding.

To make matters more confusing, many web servers and some application servers are referred to, or refer to themselves, as web application servers.

The bottom line is that today’s most popular web servers and application servers are hybrids of both. Most of the increasingly rich applications you use today feature a combination of static web content and dynamic application content, delivered via a combination of web server and application server technologies.

How to make flexbox items the same size?

Im no expert with flex but I got there by setting the basis to 50% for the two items i was dealing with. Grow to 1 and shrink to 0.

Inline styling: flex: '1 0 50%',

Change the Bootstrap Modal effect

Here is pure Bootstrap 4 with CSS 3 solution.

<div class="modal fade2" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
      </div>
      <div class="modal-body">
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-primary" data-dismiss="modal">OK</button>
      </div>
    </div>
  </div>
</div>

.fade2 {
    transform: scale(0.9);
    opacity: 0;
    transition: all .2s linear;
    display: block !important;
}

.fade2.show {
    opacity: 1;
    transform: scale(1);
}

$('#exampleModal').modal();

function afterModalTransition(e) {
  e.setAttribute("style", "display: none !important;");
}
$('#exampleModal').on('hide.bs.modal', function (e) {
    setTimeout( () => afterModalTransition(this), 200);
})

Full example here.

Maybe it will help someone.

--

Thank you @DavidDomain too.

Python 3: EOF when reading a line (Sublime Text 2 is angry)

help(input) shows what keyboard shortcuts produce EOF, namely, Unix: Ctrl-D, Windows: Ctrl-Z+Return:

input([prompt]) -> string

Read a string from standard input. The trailing newline is stripped. If the user hits EOF (Unix: Ctl-D, Windows: Ctl-Z+Return), raise EOFError. On Unix, GNU readline is used if enabled. The prompt string, if given, is printed without a trailing newline before reading.

You could reproduce it using an empty file:

$ touch empty
$ python3 -c "input()" < empty
Traceback (most recent call last):
  File "<string>", line 1, in <module>
EOFError: EOF when reading a line

You could use /dev/null or nul (Windows) as an empty file for reading. os.devnull shows the name that is used by your OS:

$ python3 -c "import os; print(os.devnull)"
/dev/null

Note: input() happily accepts input from a file/pipe. You don't need stdin to be connected to the terminal:

$ echo abc | python3 -c "print(input()[::-1])"
cba

Either handle EOFError in your code:

try:
    reply = input('Enter text')
except EOFError:
    break

Or configure your editor to provide a non-empty input when it runs your script e.g., by using a customized command line if it allows it: python3 "%f" < input_file

Loop backwards using indices in Python?

 
for i in range(100, -1, -1)

and some slightly longer (and slower) solution:

for i in reversed(range(101))

for i in range(101)[::-1]

How (and why) to use display: table-cell (CSS)

How (and why) to use display: table-cell (CSS)

I just wanted to mention, since I don't think any of the other answers did directly, that the answer to "why" is: there is no good reason, and you should probably never do this.

In my over a decade of experience in web development, I can't think of a single time I would have been better served to have a bunch of <div>s with display styles than to just have table elements.

The only hypothetical I could come up with is if you have tabular data stored in some sort of non-HTML-table format (eg. a CSV file). In a very specific version of this case it might be easier to just add <div> tags around everything and then add descendent-based styles, instead of adding actual table tags.

But that's an extremely contrived example, and in all real cases I know of simply using table tags would be better.

How to style a div to be a responsive square?

HTML

<div class='square-box'>
    <div class='square-content'>
        <h3>test</h3>
    </div>
</div>

CSS

.square-box{
    position: relative;
    width: 50%;
    overflow: hidden;
    background: #4679BD;
}
.square-box:before{
    content: "";
    display: block;
    padding-top: 100%;
}
.square-content{
    position:  absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    color: white;
    text-align: center;
}

http://jsfiddle.net/38Tnx/1425/

How can I remove a character from a string using JavaScript?

The shortest way would be to use splice

var inputString = "abc";
// convert to array and remove 1 element at position 4 and save directly to the array itself
let result = inputString.split("").splice(3, 1).join();
console.log(result);

Read pdf files with php

You might want to also try this application http://pdfbox.apache.org/. A working example can be found at https://www.jinises.com

Is there a way to pass optional parameters to a function?

If you want give some default value to a parameter assign value in (). like (x =10). But important is first should compulsory argument then default value.

eg.

(y, x =10)

but

(x=10, y) is wrong

Save matplotlib file to a directory

Here's the piece of code that saves plot to the selected directory. If the directory does not exist, it is created.

import os
import matplotlib.pyplot as plt

script_dir = os.path.dirname(__file__)
results_dir = os.path.join(script_dir, 'Results/')
sample_file_name = "sample"

if not os.path.isdir(results_dir):
    os.makedirs(results_dir)

plt.plot([1,2,3,4])
plt.ylabel('some numbers')
plt.savefig(results_dir + sample_file_name)

How do I use select with date condition?

I always get the filter date into a datetime, with no time (time= 00:00:00.000)

DECLARE @FilterDate  datetime --final destination, will not have any time on it
DECLARE @GivenDateD  datetime --if you're given a datetime
DECLARE @GivenDateS  char(23) --if you're given a string, it can be any valid date format, not just the yyyy/mm/dd hh:mm:ss.mmm that I'm using

SET @GivenDateD='2009/03/30 13:42:50.123'
SET @GivenDateS='2009/03/30 13:42:50.123'

--remove the time and assign it to the datetime
@FilterDate=dateadd(dd, datediff(dd, 0, @FilterDateD), 0)
--OR
@FilterDate=dateadd(dd, datediff(dd, 0, @FilterDateS), 0)

You can use this WHERE clause to then filter:

WHERE ColumnDateTime>=@FilterDate AND ColumnDateTime<@FilterDate+1

this will give all matches that are on or after the beginning of the day on 2009/03/30 up to and including the complete day on 2009/03/30

you can do the same for START and END filter parameters as well. Always make the start date a datetime and use zero time on the day you want, and make the condition ">=". Always make the end date the zero time on the day after you want and use "<". Doing that, you will always include any dates properly, regardless of the time portion of the date.

C fopen vs open

opening a file using fopen
before we can read(or write) information from (to) a file on a disk we must open the file. to open the file we have called the function fopen. 

1.firstly it searches on the disk the file to be opened.
2.then it loads the file from the disk into a place in memory called buffer.
3.it sets up a character pointer that points to the first character of the buffer.

this the way of behaviour of fopen function
there are some causes while buffering process,it may timedout. so while comparing fopen(high level i/o) to open (low level i/o) system call , and it is a faster more appropriate than fopen.

What is the difference between an annotated and unannotated tag?

The big difference is perfectly explained here.

Basically, lightweight tags are just pointers to specific commits. No further information is saved; on the other hand, annotated tags are regular objects, which have an author and a date and can be referred because they have their own SHA key.

If knowing who tagged what and when is relevant for you, then use annotated tags. If you just want to tag a specific point in your development, no matter who and when did that, then lightweight tags are good enough.

Normally you'd go for annotated tags, but it is really up to the Git master of the project.

asterisk : Unable to connect to remote asterisk (does /var/run/asterisk.ctl exist?)

I solved this problem by using: chown -R etc/asterisk chown -R var/lib/asterisk

this is bacause, as said here, I wasn't running as administrator. So, I made my user as owner of the Asterisk directories.

How to use Bootstrap in an Angular project?

If you use angular cli, after adding bootstrap into package.json and install the package, all you need is add boostrap.min.css into .angular-cli.json's "styles" section.

One important thing is "When you make changes to .angular-cli.json you will need to re-start ng serve to pick up configuration changes."

Ref:

https://github.com/angular/angular-cli/wiki/stories-include-bootstrap

Why are Python's 'private' methods not actually private?

It's not like you absolutly can't get around privateness of members in any language (pointer arithmetics in C++, Reflections in .NET/Java).

The point is that you get an error if you try to call the private method by accident. But if you want to shoot yourself in the foot, go ahead and do it.

Edit: You don't try to secure your stuff by OO-encapsulation, do you?

How to find the Git commit that introduced a string in any branch?

You can do:

git log -S <whatever> --source --all

To find all commits that added or removed the fixed string whatever. The --all parameter means to start from every branch and --source means to show which of those branches led to finding that commit. It's often useful to add -p to show the patches that each of those commits would introduce as well.

Versions of git since 1.7.4 also have a similar -G option, which takes a regular expression. This actually has different (and rather more obvious) semantics, explained in this blog post from Junio Hamano.

As thameera points out in the comments, you need to put quotes around the search term if it contains spaces or other special characters, for example:

git log -S 'hello world' --source --all
git log -S "dude, where's my car?" --source --all

Here's an example using -G to find occurrences of function foo() {:

git log -G "^(\s)*function foo[(][)](\s)*{$" --source --all

how do I set height of container DIV to 100% of window height?

 
html {
  min-height: 100%;
}

body {
  min-height: 100vh;
}

The html height (%) will take care of the height of the documents that's height is more than a 100% of the screen view while the body view height (vh) will take care of the document's height that is less than the height of the screen view.

Regex: ignore case sensitivity

As I discovered from this similar post (ignorecase in AWK), on old versions of awk (such as on vanilla Mac OS X), you may need to use 'tolower($0) ~ /pattern/'.

IGNORECASE or (?i) or /pattern/i will either generate an error or return true for every line.

Java Date cut off time information

 
Date date = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
date = cal.getTime();

How to Troubleshoot Intermittent SQL Timeout Errors

I had an issue similar to this and found out is was due to a default .Net framework setting

Sqlcommand.Timeout

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout(v=VS.100).aspx

The default is 30 seconds as sated in the above url by Microsoft, try setting this to a higher number of seconds or maybe -1 before opening the connection to see if this solves the issue.

It maybe a setting in your web.config or app.config files or on you applicaiton / web server config files.

Nginx: stat() failed (13: permission denied)

Symptom:

Could not upload images to WordPress Media Library.

Cause:

(CentOS) yum update

Error:

2014/10/22 18:08:50 [crit] 23286#0: *5332 open() "/var/lib/nginx/tmp/client_body/0000000003" failed (13: Permission denied), client: 1.2.3.4, server: _, request: "POST /wp-admin/media-new.php HTTP/1.1", host: "example.com", referrer: "http://example/wp-admin/media-new.php"

Solution:

chown -R www-data:www-data /var/lib/nginx

SQL Case Sensitive String Compare

simplifying the general answer

SQL Case Sensitive String Compare

These examples may be helpful:

Declare @S1 varchar(20) = 'SQL'
Declare @S2 varchar(20) = 'sql'

  
if @S1 = @S2 print 'equal!' else print 'NOT equal!' -- equal (default non-case sensitivity for SQL

if cast(@S1 as binary) = cast(Upper(@S2) as binary) print 'equal!' else print 'NOT equal!' -- equal

if cast(@S1 as binary) = cast(@S2 as binary) print 'equal!' else print 'NOT equal!' -- not equal

if  @S1 COLLATE Latin1_General_CS_AS  = Upper(@S2) COLLATE Latin1_General_CS_AS  print 'equal!' else print 'NOT equal!' -- equal

if  @S1 COLLATE Latin1_General_CS_AS  = @S2 COLLATE Latin1_General_CS_AS  print 'equal!' else print 'NOT equal!' -- not equal

The convert is probably more efficient than something like runtime calculation of hashbytes, and I'd expect the collate may be even faster.

How can I change my Cygwin home folder after installation?

Change your HOME environment variable.

on XP, its right-click My Computer >> Properties >> Advanced >> Environment Variables >> User Variables for >> [select variable HOME] >> edit

Limit text length to n lines using CSS

As far as I can see, this would be possible only using height: (some em value); overflow: hidden and even then it wouldn't have the fancy ... at the end.

If that is not an option, I think it's impossible without some server side pre-processing (difficult because text flow is impossible to predict reliably) or jQuery (possible but probably complicated).

Last segment of URL in jquery

_x000D_
_x000D_ 
var parts = 'http://mywebsite/folder/file'.split('/');_x000D_
var lastSegment = parts.pop() || parts.pop();  // handle potential trailing slash_x000D_
_x000D_
console.log(lastSegment);
_x000D_
_x000D_
_x000D_

Accessing a Dictionary.Keys Key through a numeric index

A dictionary may not be very intuitive for using index for reference but, you can have similar operations with an array of KeyValuePair:

ex. KeyValuePair<string, string>[] filters;

Converting double to string

Kotlin

You can use .toString directly on any data type in kotlin, like

val d : Double = 100.00
val string : String = d.toString()

How to break/exit from a each() function in JQuery?

Return false from the anonymous function:

$(xml).find("strengths").each(function() {
  // Code
  // To escape from this block based on a condition:
  if (something) return false;
});

From the documentation of the each method:

Returning 'false' from within the each function completely stops the loop through all of the elements (this is like using a 'break' with a normal loop). Returning 'true' from within the loop skips to the next iteration (this is like using a 'continue' with a normal loop).

pip cannot install anything

It's because in the pip configuration the index-url parameter should point to the new pypi url. Change the file in ~/.pip/pip.conf or if you are running pip as root, in: /root/.pip/pip.conf.

Probably you have this:

 [global]
 index-url=http://f.pypi.python.org/simple

You shoudl change it for this:

  [global]
  index-url=https://pypi.python.org/pypi/

And then all should work as before. I hope it helps you.

How do I use a third-party DLL file in Visual Studio C++?

In order to use Qt with dynamic linking you have to specify the lib files (usually qtmaind.lib, QtCored4.lib and QtGuid4.lib for the "Debug" configration) in
Properties » Linker » Input » Additional Dependencies.

You also have to specify the path where the libs are, namely in
Properties » Linker » General » Additional Library Directories.

And you need to make the corresponding .dlls are accessible at runtime, by either storing them in the same folder as your .exe or in a folder that is on your path.

Calculate distance in meters when you know longitude and latitude in java

In C++ it is done like this:

#define LOCAL_PI 3.1415926535897932385 

double ToRadians(double degrees) 
{
  double radians = degrees * LOCAL_PI / 180;
  return radians;
}

double DirectDistance(double lat1, double lng1, double lat2, double lng2) 
{
  double earthRadius = 3958.75;
  double dLat = ToRadians(lat2-lat1);
  double dLng = ToRadians(lng2-lng1);
  double a = sin(dLat/2) * sin(dLat/2) + 
             cos(ToRadians(lat1)) * cos(ToRadians(lat2)) * 
             sin(dLng/2) * sin(dLng/2);
  double c = 2 * atan2(sqrt(a), sqrt(1-a));
  double dist = earthRadius * c;
  double meterConversion = 1609.00;
  return dist * meterConversion;
}

Convert a hexadecimal string to an integer efficiently in C?

 
#include "math.h"
#include "stdio.h"
///////////////////////////////////////////////////////////////
//  The bits arg represents the bit say:8,16,32...                                                                                                              
/////////////////////////////////////////////////////////////
volatile long Hex_To_Int(long Hex,char bits)
{
    long Hex_2_Int;
    char byte;
    Hex_2_Int=0;

    for(byte=0;byte<bits;byte++)
    {
        if(Hex&(0x0001<<byte))
            Hex_2_Int+=1*(pow(2,byte));
        else
            Hex_2_Int+=0*(pow(2,byte));
    }

    return Hex_2_Int;
}
///////////////////////////////////////////////////////////////
//                                                                                                                  
/////////////////////////////////////////////////////////////

void main (void)
{
    int Dec;   
    char Hex=0xFA;
    Dec= Hex_To_Int(Hex,8);  //convert an 8-bis hexadecimal value to a number in base 10
    printf("the number is %d",Dec);
}

Batch script to find and replace a string in text file without creating an extra output file for storing the modified file

 
@echo off 
    setlocal enableextensions disabledelayedexpansion

    set "search=%1"
    set "replace=%2"

    set "textFile=Input.txt"

    for /f "delims=" %%i in ('type "%textFile%" ^& break ^> "%textFile%" ') do (
        set "line=%%i"
        setlocal enabledelayedexpansion
        >>"%textFile%" echo(!line:%search%=%replace%!
        endlocal
    )

for /f will read all the data (generated by the type comamnd) before starting to process it. In the subprocess started to execute the type, we include a redirection overwritting the file (so it is emptied). Once the do clause starts to execute (the content of the file is in memory to be processed) the output is appended to the file.

How to shrink temp tablespace in oracle?

I don't bother with dropping the alternate temp in case i need to reclaim storage again in the future...

  1. from temp group set default to stand-alone temp
  2. wait awhile, then resize members of temp group
  3. set default back to temp group
  4. wait awhile, resize stand alone temp. there's no rush to do the last step

Where do I mark a lambda expression async?

To mark a lambda async, simply prepend async before its argument list:

// Add a command to delete the current Group
contextMenu.Commands.Add(new UICommand("Delete this Group", async (contextMenuCmd) =>
{
    SQLiteUtils slu = new SQLiteUtils();
    await slu.DeleteGroupAsync(groupName);
}));

onClick function of an input type="button" not working

you could also try creating a button, this will work if you put it outside of the form;

<button onClick="moreFields(); return false;">Give me more fields!</button>

Regular expression to find URLs within a string

This is the one I use 

(http|ftp|https)://([\w_-]+(?:(?:\.[\w_-]+)+))([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-])?

Works for me, should work for you too.

How to change Oracle default data pump directory to import dumpfile?

You can use the following command to update the DATA PUMP DIRECTORY path,

create or replace directory DATA_PUMP_DIR as '/u01/app/oracle/admin/MYDB/dpdump/';

For me data path correction was required as I have restored the my database from production to test environment.

Same command can be used to create a new DATA PUMP DIRECTORY name and path.

Why doesn't [01-12] range work as expected?

As polygenelubricants says yours would look for 0|1-1|2 rather than what you wish for, due to the fact that character classes (things in []) match characters rather than strings.

Is there a way to pass javascript variables in url?

Try this:

window.location.href = "http://www.gorissen.info/Pierre/maps/googleMapLocation.php?lat=\''+elemA+'\'&lon=\''+elemB+'\'&setLatLon=Set";

how to get session id of socket.io client in Client

Have a look at my primer on exactly this topic.

UPDATE:

var sio = require('socket.io'),
    app = require('express').createServer();

app.listen(8080);
sio = sio.listen(app);

sio.on('connection', function (client) {
  console.log('client connected');

  // send the clients id to the client itself.
  client.send(client.id);

  client.on('disconnect', function () {
    console.log('client disconnected');
  });
});

Javascript reduce on array of objects

For the first iteration 'a' will be the first object in the array, hence a.x + b.x will return 1+2 i.e 3. Now in the next iteration the returned 3 is assigned to a, so a is a number now n calling a.x will give NaN.

Simple solution is first mapping the numbers in array and then reducing them as below: 

arr.map(a=>a.x).reduce(function(a,b){return a+b})

here arr.map(a=>a.x) will provide an array of numbers [1,2,4] now using .reduce(function(a,b){return a+b}) will simple add these numbers without any hassel

Another simple solution is just to provide an initial sum as zero by assigning 0 to 'a' as below:

arr.reduce(function(a,b){return a + b.x},0)

android fragment- How to save states of views in a fragment when another fragment is pushed on top of it

A simple way of keeping the values of fields in different fragments in an activity

Create the Instances of fragments and add instead of replace and remove

    FragA  fa= new FragA();
    FragB  fb= new FragB();
    FragC  fc= new FragB();
    fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.add(R.id.fragmnt_container, fa);
    fragmentTransaction.add(R.id.fragmnt_container, fb);
    fragmentTransaction.add(R.id.fragmnt_container, fc);
    fragmentTransaction.show(fa);
    fragmentTransaction.hide(fb);
    fragmentTransaction.hide(fc);
    fragmentTransaction.commit();

Then just show and hide the fragments instead of adding and removing those again

    fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.hide(fa);
    fragmentTransaction.show(fb);
    fragmentTransaction.hide(fc);
    fragmentTransaction.commit()

;

When should I really use noexcept?
  1. There are many examples of functions that I know will never throw, but for which the compiler cannot determine so on its own. Should I append noexcept to the function declaration in all such cases?

noexcept is tricky, as it is part of the functions interface. Especially, if you are writing a library, your client code can depend on the noexcept property. It can be difficult to change it later, as you might break existing code. That might be less of a concern when you are implementing code that is only used by your application.

If you have a function that cannot throw, ask yourself whether it will like stay noexcept or would that restrict future implementations? For example, you might want to introduce error checking of illegal arguments by throwing exceptions (e.g., for unit tests), or you might depend on other library code that could change its exception specification. In that case, it is safer to be conservative and omit noexcept.

On the other hand, if you are confident that the function should never throw and it is correct that it is part of the specification, you should declare it noexcept. However, keep in mind that the compiler will not be able to detect violations of noexcept if your implementation changes.

  1. For which situations should I be more careful about the use of noexcept, and for which situations can I get away with the implied noexcept(false)?

There are four classes of functions that should you should concentrate on because they will likely have the biggest impact:

  1. move operations (move assignment operator and move constructors)
  2. swap operations
  3. memory deallocators (operator delete, operator delete[])
  4. destructors (though these are implicitly noexcept(true) unless you make them noexcept(false))

These functions should generally be noexcept, and it is most likely that library implementations can make use of the noexcept property. For example, std::vector can use non-throwing move operations without sacrificing strong exception guarantees. Otherwise, it will have to fall back to copying elements (as it did in C++98).

This kind of optimization is on the algorithmic level and does not rely on compiler optimizations. It can have a significant impact, especially if the elements are expensive to copy.

  1. When can I realistically expect to observe a performance improvement after using noexcept? In particular, give an example of code for which a C++ compiler is able to generate better machine code after the addition of noexcept.

The advantage of noexcept against no exception specification or throw() is that the standard allows the compilers more freedom when it comes to stack unwinding. Even in the throw() case, the compiler has to completely unwind the stack (and it has to do it in the exact reverse order of the object constructions).

In the noexcept case, on the other hand, it is not required to do that. There is no requirement that the stack has to be unwound (but the compiler is still allowed to do it). That freedom allows further code optimization as it lowers the overhead of always being able to unwind the stack.

The related question about noexcept, stack unwinding and performance goes into more details about the overhead when stack unwinding is required.

I also recommend Scott Meyers book "Effective Modern C++", "Item 14: Declare functions noexcept if they won't emit exceptions" for further reading.

Copy folder recursively in Node.js

This is my approach to solve this problem without any extra modules. Just using the built-in fs and path modules.

Note: This does use the read / write functions of fs, so it does not copy any meta data (time of creation, etc.). As of Node.js 8.5 there is a copyFileSync function available which calls the OS copy functions and therefore also copies meta data. I did not test them yet, but it should work to just replace them. (See https://nodejs.org/api/fs.html#fs_fs_copyfilesync_src_dest_flags)

var fs = require('fs');
var path = require('path');

function copyFileSync( source, target ) {

    var targetFile = target;

    // If target is a directory, a new file with the same name will be created
    if ( fs.existsSync( target ) ) {
        if ( fs.lstatSync( target ).isDirectory() ) {
            targetFile = path.join( target, path.basename( source ) );
        }
    }

    fs.writeFileSync(targetFile, fs.readFileSync(source));
}

function copyFolderRecursiveSync( source, target ) {
    var files = [];

    // Check if folder needs to be created or integrated
    var targetFolder = path.join( target, path.basename( source ) );
    if ( !fs.existsSync( targetFolder ) ) {
        fs.mkdirSync( targetFolder );
    }

    // Copy
    if ( fs.lstatSync( source ).isDirectory() ) {
        files = fs.readdirSync( source );
        files.forEach( function ( file ) {
            var curSource = path.join( source, file );
            if ( fs.lstatSync( curSource ).isDirectory() ) {
                copyFolderRecursiveSync( curSource, targetFolder );
            } else {
                copyFileSync( curSource, targetFolder );
            }
        } );
    }
}

How to know/change current directory in Python shell?

The easiest way to change the current working directory in python is using the 'os' package. Below there is an example for windows computer:

# Import the os package
import os

# Confirm the current working directory 
os.getcwd()

# Use '\\' while changing the directory 
os.chdir("C:\\user\\foldername")

Git and nasty "error: cannot lock existing info/refs fatal"

In my case a branch was moved to a subdirectory and the directory was called as the branch. Git was confused by that. When I deleted the local branch (in SourceTree just with right click delete) everything worked as usual.

Add/delete row from a table

Here's the code JS Bin using jQuery. Tested on all the browsers. Here, we have to click the rows in order to delete it with beautiful effect. Hope it helps.

ssh : Permission denied (publickey,gssapi-with-mic)

As everybody else has already said you need to edit /etc/ssh/sshd_config and change PasswordAuthentication no to PasswordAuthentication yes

I ran into this problem setting up a Vagrant box - so therefore it makes sense to script this and do it automatically in a shell provisioner:

sudo sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config;

sudo systemctl restart sshd;

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

Taking for granted that the JSON you posted is actually what you are seeing in the browser, then the problem is the JSON itself.

The JSON snippet you have posted is malformed.

You have posted:

[{
        "name" : "shopqwe",
        "mobiles" : [],
        "address" : {
            "town" : "city",
            "street" : "streetqwe",
            "streetNumber" : "59",
            "cordX" : 2.229997,
            "cordY" : 1.002539
        },
        "shoe"[{
                "shoeName" : "addidas",
                "number" : "631744030",
                "producent" : "nike",
                "price" : 999.0,
                "sizes" : [30.0, 35.0, 38.0]
            }]

while the correct JSON would be:

[{
        "name" : "shopqwe",
        "mobiles" : [],
        "address" : {
            "town" : "city",
            "street" : "streetqwe",
            "streetNumber" : "59",
            "cordX" : 2.229997,
            "cordY" : 1.002539
        },
        "shoe" : [{
                "shoeName" : "addidas",
                "number" : "631744030",
                "producent" : "nike",
                "price" : 999.0,
                "sizes" : [30.0, 35.0, 38.0]
            }
        ]
    }
]

What is %2C in a URL?

In Firefox there is Ctrl+Shift+K for the Web console, then you type

;decodeURIComponent("%2c")
  • mind the semicolon in the beginning
  • if you Copy&Paste, you should first enable it (the console will warn you)

and you get the answer:

","

How to unzip files programmatically in Android?

Android has build-in Java API. Check out java.util.zip package.

The class ZipInputStream is what you should look into. Read ZipEntry from the ZipInputStream and dump it into filesystem/folder. Check similar example to compress into zip file.

Index all *except* one item in python

 
>>> l = range(1,10)
>>> l
[1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[:2] 
[1, 2]
>>> l[3:]
[4, 5, 6, 7, 8, 9]
>>> l[:2] + l[3:]
[1, 2, 4, 5, 6, 7, 8, 9]
>>>

See also

Explain Python's slice notation

How to set up Spark on Windows?

I found the easiest solution on Windows is to build from source.

You can pretty much follow this guide: http://spark.apache.org/docs/latest/building-spark.html

Download and install Maven, and set MAVEN_OPTS to the value specified in the guide.

But if you're just playing around with Spark, and don't actually need it to run on Windows for any other reason that your own machine is running Windows, I'd strongly suggest you install Spark on a linux virtual machine. The simplest way to get started probably is to download the ready-made images made by Cloudera or Hortonworks, and either use the bundled version of Spark, or install your own from source or the compiled binaries you can get from the spark website.

Reimport a module in python while interactive

If you want to import a specific function or class from a module, you can do this:

import importlib
import sys
importlib.reload(sys.modules['my_module'])
from my_module import my_function

Simplest way to restart service on a remote computer

If you attempting to do this on a server on different domain you will need to a little bit more than what has been suggested by most answers so far, this is what I use to accomplish this:

#Configuration
$servername = "ABC",
$serviceAccountUsername = "XYZ",
$serviceAccountPassword = "XXX"

#Establish connection
try {
    if (-not ([System.IO.Directory]::Exists('\\' + $servername))) {
        net use \\$servername /user:$serviceAccountUsername $serviceAccountPassword
    }
}
catch {
    #May already exists, if so just continue
    Write-Output $_.Exception.Message
}

#Restart Service
sc.exe \\$servername stop "ServiceNameHere"
sc.exe \\$servername start "ServiceNameHere"

How to insert pandas dataframe via mysqldb into database?

This has worked for me. At first I've created only the database, no predefined table I created.

from platform import python_version
print(python_version())
3.7.3

path='glass.data'
df=pd.read_csv(path)
df.head()


!conda install sqlalchemy
!conda install pymysql

pd.__version__
    '0.24.2'

sqlalchemy.__version__
'1.3.20'

restarted the Kernel after installation.

from sqlalchemy import create_engine
engine = create_engine('mysql+pymysql://USER:PASSWORD@HOST:PORT/DATABASE_NAME', echo=False)

try:
df.to_sql(name='glasstable',con=engine,index=False, if_exists='replace')
print('Sucessfully written to Database!!!')

except Exception as e:
    print(e)

How to find the first and second maximum number?

OK I found it.

=LARGE($E$4:$E$9;A12)

=large(array, k)

Array Required. The array or range of data for which you want to determine the k-th largest value.

K Required. The position (from the largest) in the array or cell range of data to return.

Default Values to Stored Procedure in Oracle

Default values are only used if the arguments are not specified. In your case you did specify the arguments - both were supplied, with a value of NULL. (Yes, in this case NULL is considered a real value :-). Try:

EXEC TEST()

Share and enjoy.

Addendum: The default values for procedure parameters are certainly buried in a system table somewhere (see the SYS.ALL_ARGUMENTS view), but getting the default value out of the view involves extracting text from a LONG field, and is probably going to prove to be more painful than it's worth. The easy way is to add some code to the procedure:

CREATE OR REPLACE PROCEDURE TEST(X IN VARCHAR2 DEFAULT 'P',
                                 Y IN NUMBER DEFAULT 1)
AS
  varX VARCHAR2(32767) := NVL(X, 'P');
  varY NUMBER          := NVL(Y, 1);
BEGIN
  DBMS_OUTPUT.PUT_LINE('X=' || varX || ' -- ' || 'Y=' || varY);
END TEST;

How to install sklearn?

I would recommend you look at getting the anaconda package, it will install and configure Sklearn and its dependencies.

https://www.continuum.io

Reset auto increment counter in postgres

Note that if you have table name with '_', it is removed in sequence name.

For example, table name: user_tokens column: id Sequence name: usertokens_id_seq

Convert JSON array to Python list

Tested on Ideone.


import json
array = '{"fruits": ["apple", "banana", "orange"]}'
data  = json.loads(array)
fruits_list = data['fruits']
print fruits_list

PHP: How to check if image file exists?

file_exists($filepath) will return a true result for a directory and full filepath, so is not always a solution when a filename is not passed.

is_file($filepath) will only return true for fully filepaths

How to pass values between Fragments

I think a good way to solve this problem is to use a custom interface.

Lets say you have two fragments (A and B) which are inside of the same activity and you want to send data from A to B.

Interface :

public interface OnDataSentListener{
    void onDataSent(Object data);
}

Activity:

    public class MyActivity extends AppCompatActivity{

            private OnDataSentListener onDataSentListener;

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

                FragmentTransaction trans = getFragmentManager().beginTransaction();

                FragmentA fa = new FragmentA();
                FragmentB fb = new FragmentB();

               fa.setOnDataSentListener(new Listeners.OnDataSentListener() {
                    @Override
                    public void onDataSent(Object data) {
                         if(onDataSentListener != null)  onDataSentListener.onDataSent(data);
                    }
               });

                transaction.add(R.id.frame_a, fa);
                transaction.add(R.id.frame_b, fb);

                transaction.commit();
            }

            public void setOnDataSentListener(OnDataSentListener listener){
                this.onDataSentListener = listener;
            }
        }

Fragment A:

public class FragmentA extends Fragment{

    private OnDataSentListener onDataSentListener;

    private void sendDataToFragmentB(Object data){
        if(onDataSentListener != null) onDataSentListener.onDataSent(data);
    }

    public void setOnDataSentListener(OnDataSentListener listener){
        this.onDataSentListener = listener;
    }
}

Fragment B:

public class FragmentB extends Fragment{

    private void initReceiver(){
        ((MyActivity) getActivity()).setOnDataSentListener(new OnDataSentListener() {
            @Override
            public void onDataSent(Object data) {
                //Here you receive the data from fragment A
            }
        });
    }
}

How to detect duplicate values in PHP array?

You can use array_count_values function

$array = array('apple', 'orange', 'pear', 'banana', 'apple',
'pear', 'kiwi', 'kiwi', 'kiwi');

print_r(array_count_values($array));

will output

Array
(
   [apple] => 2
   [orange] => 1
   [pear] => 2
   etc...
)

HashSet vs LinkedHashSet

The answer lies in which constructors the LinkedHashSet uses to construct the base class:

public LinkedHashSet(int initialCapacity, float loadFactor) {
    super(initialCapacity, loadFactor, true);      // <-- boolean dummy argument
}

...

public LinkedHashSet(int initialCapacity) {
    super(initialCapacity, .75f, true);            // <-- boolean dummy argument
}

...

public LinkedHashSet() {
    super(16, .75f, true);                         // <-- boolean dummy argument
}

...

public LinkedHashSet(Collection<? extends E> c) {
    super(Math.max(2*c.size(), 11), .75f, true);   // <-- boolean dummy argument
    addAll(c);
}

And (one example of) a HashSet constructor that takes a boolean argument is described, and looks like this:

/**
 * Constructs a new, empty linked hash set.  (This package private
 * constructor is only used by LinkedHashSet.) The backing
 * HashMap instance is a LinkedHashMap with the specified initial
 * capacity and the specified load factor.
 *
 * @param      initialCapacity   the initial capacity of the hash map
 * @param      loadFactor        the load factor of the hash map
 * @param      dummy             ignored (distinguishes this
 *             constructor from other int, float constructor.)
 * @throws     IllegalArgumentException if the initial capacity is less
 *             than zero, or if the load factor is nonpositive
 */
HashSet(int initialCapacity, float loadFactor, boolean dummy) {
    map = new LinkedHashMap<E,Object>(initialCapacity, loadFactor);
}

How do you make strings "XML safe"?

1) You can wrap your text as CDATA like this:

<mytag>
    <![CDATA[Your text goes here. Btw: 5<6 and 6>5]]>
</mytag>

see http://www.w3schools.com/xml/xml_cdata.asp

2) As already someone said: Escape those chars. E.g. like so: 

5&lt;6 and 6&gt;5

socket.error:[errno 99] cannot assign requested address and namespace in python

Stripping things down to basics this is what you would want to test with:

import socket
server = socket.socket() 
server.bind(("10.0.0.1", 6677)) 
server.listen(4) 
client_socket, client_address = server.accept()
print(client_address, "has connected")
while 1==1:
    recvieved_data = client_socket.recv(1024)
    print(recvieved_data)

This works assuming a few things:

  1. Your local IP address (on the server) is 10.0.0.1 (This video shows you how)
  2. No other software is listening on port 6677

Also note the basic concept of IP addresses:

Try the following, open the start menu, in the "search" field type cmd and press enter. Once the black console opens up type ping www.google.com and this should give you and IP address for google. This address is googles local IP and they bind to that and obviously you can not bind to an IP address owned by google.

With that in mind, you own your own set of IP addresses. First you have the local IP of the server, but then you have the local IP of your house. In the below picture 192.168.1.50 is the local IP of the server which you can bind to. You still own 83.55.102.40 but the problem is that it's owned by the Router and not your server. So even if you visit http://whatsmyip.com and that tells you that your IP is 83.55.102.40 that is not the case because it can only see where you're coming from.. and you're accessing your internet from a router.

enter image description here

In order for your friends to access your server (which is bound to 192.168.1.50) you need to forward port 6677 to 192.168.1.50 and this is done in your router. Assuming you are behind one.

If you're in school there's other dilemmas and routers in the way most likely.

Joining pandas dataframes by column names

you need to make county_ID as index for the right frame:

frame_2.join ( frame_1.set_index( [ 'county_ID' ], verify_integrity=True ),
               on=[ 'countyid' ], how='left' )

for your information, in pandas left join breaks when the right frame has non unique values on the joining column. see this bug.

so you need to verify integrity before joining by , verify_integrity=True

How to change status bar color in Flutter?

Most of the answers are using SystemChrome which only works for Android. My solution is to combine both AnnotatedRegion and SafeArea into new Widget so it also works in iOS. And I can use it with or without AppBar.

class ColoredStatusBar extends StatelessWidget {
  const ColoredStatusBar({
    Key key,
    this.color,
    this.child,
    this.brightness = Brightness.dark,
  }) : super(key: key);

  final Color color;
  final Widget child;
  final Brightness brightness;

  @override
  Widget build(BuildContext context) {
    final defaultColor = Colors.blue;
    final androidIconBrightness =
        brightness == Brightness.dark ? Brightness.light : Brightness.dark;
    return AnnotatedRegion<SystemUiOverlayStyle>(
      value: SystemUiOverlayStyle(
        statusBarColor: color ?? defaultColor,
        statusBarIconBrightness: androidIconBrightness,
        statusBarBrightness: brightness,
      ),
      child: Container(
        color: color ?? defaultColor,
        child: SafeArea(
          bottom: false,
          child: Container(
            child: child,
          ),
        ),
      ),
    );
  }
}

Usage: Place it to top of page's widget.

@override
Widget build(BuildContext context) {
  return ColoredStatusBar(
    child: /* your child here */,
  );
}

convert php date to mysql format

There is several options.

Either convert it to timestamp and use as instructed in other posts with strtotime() or use MySQL’s date parsing option

Passing data into "router-outlet" child components

 
<router-outlet [node]="..."></router-outlet>

is just invalid. The component added by the router is added as sibling to <router-outlet> and does not replace it.

See also https://angular.io/guide/component-interaction#parent-and-children-communicate-via-a-service

@Injectable() 
export class NodeService {
  private node:Subject<Node> = new BehaviorSubject<Node>([]);

  get node$(){
    return this.node.asObservable().filter(node => !!node);
  }

  addNode(data:Node) {
    this.node.next(data);
  }
}

@Component({
    selector : 'node-display',
    providers: [NodeService],
    template : `
        <router-outlet></router-outlet>
    `
})
export class NodeDisplayComponent implements OnInit {
    constructor(private nodeService:NodeService) {}
    node: Node;
    ngOnInit(): void {
        this.nodeService.getNode(path)
            .subscribe(
                node => {
                    this.nodeService.addNode(node);
                },
                err => {
                    console.log(err);
                }
            );
    }
}

export class ChildDisplay implements OnInit{
    constructor(nodeService:NodeService) {
      nodeService.node$.subscribe(n => this.node = n);
    }
}

https with WCF error: "Could not find base address that matches scheme https"

I think you are trying to configure your service in a similar way to the following config. There is more information here: Specify a Service with Two Endpoints Using Different Binding Values. Also, other than for development, it's probably not a good idea to have both HTTP & HTTPS endpoints to the same service. It kinda defeats the purpose of HTTPS. Hope this helps!

<service type="HelloWorld, IndigoConfig, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null">
    <endpoint
        address="http://computer:8080/Hello"
        contract="HelloWorld, IndigoConfig, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
        binding="basicHttpBinding"
        bindingConfiguration="shortTimeout"
    </endpoint>
    <endpoint
        address="http://computer:8080/Hello"
        contract="HelloWorld, IndigoConfig, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null"
        binding="basicHttpBinding"
        bindingConfiguration="Secure"
     </endpoint>
</service>
<bindings>
    <basicHttpBinding 
        name="shortTimeout"
        timeout="00:00:00:01" 
     />
     <basicHttpBinding 
        name="Secure">
        <Security mode="Transport" />
     </basicHttpBinding>
</bindings>

What does the 'L' in front a string mean in C++?

It means it's an array of wide characters (wchar_t) instead of narrow characters (char).

It's a just a string of a different kind of character, not necessarily a Unicode string.

What is the best/safest way to reinstall Homebrew?

The way to reinstall Homebrew is completely remove it and start over. The Homebrew FAQ has a link to a shell script to uninstall homebrew.

If the only thing you've installed in /usr/local is homebrew itself, you can just rm -rf /usr/local/* /usr/local/.git to clear it out. But /usr/local/ is the standard Unix directory for all extra binaries, not just Homebrew, so you may have other things installed there. In that case uninstall_homebrew.sh is a better bet. It is careful to only remove homebrew's files and leave the rest alone.

Could not find server 'server name' in sys.servers. SQL Server 2014

At first check out that your linked server is in the list by this query

select name from sys.servers

If it not exists then try to add to the linked server 

EXEC sp_addlinkedserver @server = 'SERVER_NAME' --or may be server ip address

After that login to that linked server by

EXEC sp_addlinkedsrvlogin 'SERVER_NAME'
                         ,'false'
                         ,NULL
                         ,'USER_NAME'
                         ,'PASSWORD'

Then you can do whatever you want ,treat it like your local server

exec [SERVER_NAME].[DATABASE_NAME].dbo.SP_NAME @sample_parameter

Finally you can drop that server from linked server list by 

sp_dropserver 'SERVER_NAME', 'droplogins'

If it will help you then please upvote.

node and Error: EMFILE, too many open files

I ran into this problem today, and finding no good solutions for it, I created a module to address it. I was inspired by @fbartho's snippet, but wanted to avoid overwriting the fs module.

The module I wrote is Filequeue, and you use it just like fs:

var Filequeue = require('filequeue');
var fq = new Filequeue(200); // max number of files to open at once

fq.readdir('/Users/xaver/Downloads/xaver/xxx/xxx/', function(err, files) {
    if(err) {
        throw err;
    }
    files.forEach(function(file) {
        fq.readFile('/Users/xaver/Downloads/xaver/xxx/xxx/' + file, function(err, data) {
            // do something here
        }
    });
});

What underlies this JavaScript idiom: var self = this?

The variable is captured by the inline functions defined in the method. this in the function will refer to another object. This way, you can make the function hold a reference to the this in the outer scope.

How do I sort a Set to a List in Java?

I am using this code, which I find more practical than the accepted answer above:

List<Thing> thingList = new ArrayList<>(thingSet);
thingList.sort((thing1, thing2) -> thing1.getName().compareToIgnoreCase(thing2.getName()));

What is the difference between min SDK version/target SDK version vs. compile SDK version?

The min sdk version is the earliest release of the Android SDK that your application can run on. Usually this is because of a problem with the earlier APIs, lacking functionality, or some other behavioural issue.

The target sdk version is the version your application was targeted to run on. Ideally, this is because of some sort of optimal run conditions. If you were to "make your app for version 19", this is where that would be specified. It may run on earlier or later releases, but this is what you were aiming for. This is mostly to indicate how current your application is for use in the marketplace, etc.

The compile sdk version is the version of android your IDE (or other means of compiling I suppose) uses to make your app when you publish a .apk file. This is useful for testing your application as it is a common need to compile your app as you develop it. As this will be the version to compile to an APK, it will naturally be the version of your release. Likewise, it is advisable to have this match your target sdk version.

How do I prevent mails sent through PHP mail() from going to spam?

You must to add a needle headers:

Sample code : 

$headers = "From: [email protected]\r\n";
$headers .= "Reply-To: [email protected]\r\n";
$headers .= "Return-Path: [email protected]\r\n";
$headers .= "CC: [email protected]\r\n";
$headers .= "BCC: [email protected]\r\n";

if ( mail($to,$subject,$message,$headers) ) {
   echo "The email has been sent!";
   } else {
   echo "The email has failed!";
   }
?>

How can I get screen resolution in java?

This call will give you the information you want.

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

Can jQuery get all CSS styles associated with an element?

Two years late, but I have the solution you're looking for. Not intending to take credit form the original author, here's a plugin which I found works exceptionally well for what you need, but gets all possible styles in all browsers, even IE.

Warning: This code generates a lot of output, and should be used sparingly. It not only copies all standard CSS properties, but also all vendor CSS properties for that browser.

jquery.getStyleObject.js:

/*
 * getStyleObject Plugin for jQuery JavaScript Library
 * From: http://upshots.org/?p=112
 */

(function($){
    $.fn.getStyleObject = function(){
        var dom = this.get(0);
        var style;
        var returns = {};
        if(window.getComputedStyle){
            var camelize = function(a,b){
                return b.toUpperCase();
            };
            style = window.getComputedStyle(dom, null);
            for(var i = 0, l = style.length; i < l; i++){
                var prop = style[i];
                var camel = prop.replace(/\-([a-z])/g, camelize);
                var val = style.getPropertyValue(prop);
                returns[camel] = val;
            };
            return returns;
        };
        if(style = dom.currentStyle){
            for(var prop in style){
                returns[prop] = style[prop];
            };
            return returns;
        };
        return this.css();
    }
})(jQuery);

Basic usage is pretty simple, but he's written a function for that as well:

$.fn.copyCSS = function(source){
  var styles = $(source).getStyleObject();
  this.css(styles);
}

Hope that helps.

How do I download/extract font from chrome developers tools?

If you are on a unixoid operating system and want to extract just a single file you can try the following. The structure of the chrome://cache pages is URL, parsed HTTP header, hex dump of the HTTP header and then hex dump of the payload.

To extract a file copy all payload lines from a Chrome cache page to the clipboard (starting at the second 00000000: ... line), paste them into a text editor and save them as a plain text file (e.g. file.txt). If the payload is a gzipped WOFF file use xxd -r file.txt > file.woff.gz to convert it back to a binary file and gunzip file.woff.gz for decompression.

You can then use woff2otf to convert WOFF files to the OTF format or woff2 to convert WOFF 2.0 files to the TTF format. For batch processing this workflow should obviously be scripted.

How to place a div below another div?

what about changing the position: relative on your #content #text div to position: absolute

#content #text {
   position:absolute;
   width:950px;
   height:215px;
   color:red;
}

http://jsfiddle.net/CaZY7/12/

then you can use the css properties left and top to position within the #content div

Difference between a script and a program?

A "program" in general, is a sequence of instructions written so that a computer can perform certain task.

A "script" is code written in a scripting language. A scripting language is nothing but a type of programming language in which we can write code to control another software application.

In fact, programming languages are of two types:

a. Scripting Language

b. Compiled Language

Please read this: Scripting and Compiled Languages

Java - Relative path of a file in a java web application

If you have a path for that file in the web server, you can get the real path in the server's file system using ServletContext.getRealPath(). Note that it is not guaranteed to work in every container (as a container is not required to unpack the WAR file and store the content in the file system - most do though). And I guess it won't work with files in /WEB-INF, as they don't have a virtual path.

The alternative would be to use ServletContext.getResource() which returns a URI. This URI may be a 'file:' URL, but there's no guarantee for that.

Couldn't load memtrack module Logcat Error

I faced the same problem but When I changed the skin of AVD device to HVGA, it worked.

Remove CSS class from element with JavaScript (no jQuery)

try:

function removeClassName(elem, name){
    var remClass = elem.className;
    var re = new RegExp('(^| )' + name + '( |$)');
    remClass = remClass.replace(re, '$1');
    remClass = remClass.replace(/ $/, '');
    elem.className = remClass;
}

Creating java date object from year,month,day

Make your life easy when working with dates, timestamps and durations. Use HalDateTime from

http://sourceforge.net/projects/haldatetime/?source=directory

For example you can just use it to parse your input like this:

HalDateTime mydate = HalDateTime.valueOf( "25.12.1988" );
System.out.println( mydate );   // will print in ISO format: 1988-12-25

You can also specify patterns for parsing and printing.

Deleting objects from an ArrayList in Java

Most performant would, I guess, be using the listIterator method and do a reverse iteration:

for (ListIterator<E> iter = list.listIterator(list.size()); iter.hasPrevious();){
    if (weWantToDelete(iter.previous()))  iter.remove();
}

Edit: Much later, one might also want to add the Java 8 way of removing elements from a list (or any collection!) using a lambda or method reference. An in-place filter for collections, if you like:

list.removeIf(e -> e.isBad() && e.shouldGoAway());

This is probably the best way to clean up a collection. Since it uses internal iteration, the collection implementation could take shortcuts to make it as fast as possible (for ArrayLists, it could minimize the amount of copying needed).

How can I delete a query string parameter in JavaScript?

You should be using a library to do URI manipulation as it is more complicated than it seems on the surface to do it yourself. Take a look at: http://medialize.github.io/URI.js/

How do I create a Python function with optional arguments?

Try calling it like: obj.some_function( '1', 2, '3', g="foo", h="bar" ). After the required positional arguments, you can specify specific optional arguments by name.

How to refresh token with Google API client?

I use google-api-php-client v2.2.2 I get a new token with fetchAccessTokenWithRefreshToken(); if function call without params, it returns an updated access token and the refreshed token is not lost.

if ($client->getAccessToken() && $client->isAccessTokenExpired()) {
    $new_token=$client->fetchAccessTokenWithRefreshToken();
    $token_data = $client->verifyIdToken();
}

How can I set an SQL Server connection string?

sa is a system administrator account which comes with SQL Server by default. As you know might already know, you can use two ways to log in to SQL Server.

screen shot of SQL Server Management Studio

Therefore there are connection strings which suitable for each scenario (such as Windows authentication, localdb, etc.). Use SQL Server Connection Strings for ASP.NET Web Applications to build your connection string. These are XML tags. You just need a value of connectionString.