How to use Git?

this is my blog on git and its for beginners who want to get started on git. https://techxposers.com/git-for-beginners/

Java: how do I get a class literal from a generic type?

You can manage it with a double cast :

@SuppressWarnings("unchecked") Class<List<Foo>> cls = (Class<List<Foo>>)(Object)List.class

Cannot read property 'push' of undefined when combining arrays

Generally, Push method is used to add elements at the end of an array.

Here, you have used the push method to an object and not an array which is 'order'.

Steps to debug...

Change the object into an empty array,

var order = [], stack = [];

Now you can use the push method for this array as usual.

To use push method to this 'order' array; you should not use the array index when calling push method to an array. Just use the name of the array only.

var order = [], stack = [];

for(var i = 0; i<a.length; i++){

   if(parseInt(a[i].daysleft) == 0){ 
     order.push(a[i]); 
   }

   if(parseInt(a[i].daysleft) > 0){ 
     order.push(a[i]); 
   }

   if(parseInt(a[i].daysleft) < 0){ 
     order.push(a[i]); 
   }
}

Directly assigning values to C Pointers

First Program with comments

#include <stdio.h>

int main(){
    int *ptr;             //Create a pointer that points to random memory address

    *ptr = 20;            //Dereference that pointer, 
                          // and assign a value to random memory address.
                          //Depending on external (not inside your program) state
                          // this will either crash or SILENTLY CORRUPT another 
                          // data structure in your program.  

    printf("%d", *ptr);   //Print contents of same random memory address
                          // May or may not crash, depending on who owns this address

    return 0;             
}

Second Program with comments

#include <stdio.h>

int main(){
    int *ptr;              //Create pointer to random memory address

    int q = 50;            //Create local variable with contents int 50

    ptr = &q;              //Update address targeted by above created pointer to point
                           // to local variable your program properly created

    printf("%d", *ptr);    //Happily print the contents of said local variable (q)
    return 0;
}

The key is you cannot use a pointer until you know it is assigned to an address that you yourself have managed, either by pointing it at another variable you created or to the result of a malloc call.

Using it before is creating code that depends on uninitialized memory which will at best crash but at worst work sometimes, because the random memory address happens to be inside the memory space your program already owns. God help you if it overwrites a data structure you are using elsewhere in your program.

Which terminal command to get just IP address and nothing else?

Generally, it is never guaranteed that a system will only have one IP address, for example, you can have both an ethernet and wlan connections, and if you have an active VPN connection then you'll have yet another IP address.

Linux

On Linux, hostname -I will list the current IP address(es). Relying on it always returning just one IP address will most likely not work as expected under some scenarios (i.e. a VPN link is up, multiple ethernet adapters, etc), so a more reliable way would be converting the result to an array and then loop over the elements:

ips=($(hostname -I))

for ip in "${ips[@]}"
do
    echo $ip
done

Note: If hostname -I returns the IP both in IPv4 and IPv6 formats then you can use instead hostname -I | cut -f1 -d' ' to only show the IPv4 IP.

OSX

On OSX, if you know the interface, you could use:

~$ ipconfig getifaddr en0
192.168.1.123

which will return just the IP address.

Or you could loop over possible interface names, starting with a suffix, i.e. en:

for NUMBER in $(seq 0 5); do
    ip=`ipconfig getifaddr en$NUMBER`
    if [ -n "$ip" ]; then
        myip="$ip"
        break
    fi
done

echo $myip

Also, getting the IP address becomes non-deterministic in case both a cable and wifi connections are established, when a machine has more than one ethernet interfaces, or when VPN tunnels are up.

Getting the external IP

If you need the external IP, then you can query a text-mode service, for example curl https://ipecho.net/plain would return a plain text external IP.

A faster alternative is to query a known DNS server, e.g.:

dig @ns1-1.akamaitech.net ANY whoami.akamai.net +short

Classes vs. Functions

I'm going to break from the herd on this one and provide an alternate point of view:

Never create classes.

Reliance on classes has a significant tendency to cause coders to create bloated and slow code. Classes getting passed around (since they're objects) take a lot more computational power than calling a function and passing a string or two. Proper naming conventions on functions can do pretty much everything creating a class can do, and with only a fraction of the overhead and better code readability.

That doesn't mean you shouldn't learn to understand classes though. If you're coding with others, people will use them all the time and you'll need to know how to juggle those classes. Writing your code to rely on functions means the code will be smaller, faster, and more readable. I've seen huge sites written using only functions that were snappy and quick, and I've seen tiny sites that had minimal functionality that relied heavily on classes and broke constantly. (When you have classes extending classes that contain classes as part of their classes, you know you've lost all semblance of easy maintainability.)

When it comes down to it, all data you're going to want to pass can easily be handled by the existing datatypes.

Classes were created as a mental crutch and provide no actual extra functionality, and the overly-complicated code they have a tendency to create defeats the point of that crutch in the long run.

Java String import

String is present in package java.lang which is imported by default in all java programs.

Maximum call stack size exceeded error

I know this thread is old, but i think it's worth mentioning the scenario i found this problem so it can help others.

Suppose you have nested elements like this:

<a href="#" id="profile-avatar-picker">
    <span class="fa fa-camera fa-2x"></span>
    <input id="avatar-file" name="avatar-file" type="file" style="display: none;" />
</a>

You cannot manipulate the child element events inside the event of its parent because it propagates to itself, making recursive calls until the exception is throwed.

So this code will fail:

$('#profile-avatar-picker').on('click', (e) => {
    e.preventDefault();

    $('#profilePictureFile').trigger("click");
});

You have two options to avoid this:

Move the child to the outside of the parent.
Apply stopPropagation function to the child element.

Resize image in PHP

I found a mathematical way to get this job done

Github repo - https://github.com/gayanSandamal/easy-php-image-resizer

Live example - https://plugins.nayague.com/easy-php-image-resizer/

<?php
//path for the image
$source_url = '2018-04-01-1522613288.PNG';

//separate the file name and the extention
$source_url_parts = pathinfo($source_url);
$filename = $source_url_parts['filename'];
$extension = $source_url_parts['extension'];

//define the quality from 1 to 100
$quality = 10;

//detect the width and the height of original image
list($width, $height) = getimagesize($source_url);
$width;
$height;

//define any width that you want as the output. mine is 200px.
$after_width = 200;

//resize only when the original image is larger than expected with.
//this helps you to avoid from unwanted resizing.
if ($width > $after_width) {

    //get the reduced width
    $reduced_width = ($width - $after_width);
    //now convert the reduced width to a percentage and round it to 2 decimal places
    $reduced_radio = round(($reduced_width / $width) * 100, 2);

    //ALL GOOD! let's reduce the same percentage from the height and round it to 2 decimal places
    $reduced_height = round(($height / 100) * $reduced_radio, 2);
    //reduce the calculated height from the original height
    $after_height = $height - $reduced_height;

    //Now detect the file extension
    //if the file extension is 'jpg', 'jpeg', 'JPG' or 'JPEG'
    if ($extension == 'jpg' || $extension == 'jpeg' || $extension == 'JPG' || $extension == 'JPEG') {
        //then return the image as a jpeg image for the next step
        $img = imagecreatefromjpeg($source_url);
    } elseif ($extension == 'png' || $extension == 'PNG') {
        //then return the image as a png image for the next step
        $img = imagecreatefrompng($source_url);
    } else {
        //show an error message if the file extension is not available
        echo 'image extension is not supporting';
    }

    //HERE YOU GO :)
    //Let's do the resize thing
    //imagescale([returned image], [width of the resized image], [height of the resized image], [quality of the resized image]);
    $imgResized = imagescale($img, $after_width, $after_height, $quality);

    //now save the resized image with a suffix called "-resized" and with its extension. 
    imagejpeg($imgResized, $filename . '-resized.'.$extension);

    //Finally frees any memory associated with image
    //**NOTE THAT THIS WONT DELETE THE IMAGE
    imagedestroy($img);
    imagedestroy($imgResized);
}
?>

HashSet vs. List performance

One factor your not taking into account is the robustness of the GetHashcode() function. With a perfect hash function the HashSet will clearly have better searching performance. But as the hash function diminishes so will the HashSet search time.

Replace text inside td using jQuery having td containing other elements

Wrap your to be deleted contents within a ptag, then you can do something like this:

$(function(){
  $("td").click(function(){ console.log($("td").find("p"));
    $("td").find("p").remove();    });
});

FIDDLE DEMO: http://jsfiddle.net/y3p2F/

How to disable a input in angular2

I think I figured out the problem, this input field is part of a reactive form (?), since you have included formControlName. This means that what you are trying to do by disabling the input field with is_edit is not working, e.g your attempt [disabled]="is_edit", which would in other cases work. With your form you need to do something like this:

toggle() {
  let control = this.myForm.get('name')
  control.disabled ? control.enable() : control.disable();
}

and lose the is_edit altogether.

if you want the input field to be disabled as default, you need to set the form control as:

name: [{value: '', disabled:true}]

Here's a plunker

In MS DOS copying several files to one file

If this is part of a batch script (.bat file) and you have a large list of files, you can use a multi-line ^, and optional /Y flag to suppresses prompting to confirm you want to overwrite an existing destination file.

REM Concatenate several files to one
COPY /Y ^
    this_is_file_1.csv + ^
    this_is_file_2.csv + ^
    this_is_file_3.csv + ^
    this_is_file_4.csv + ^
    this_is_file_5.csv + ^
    this_is_file_6.csv + ^
    this_is_file_7.csv + ^
    this_is_file_8.csv + ^
    this_is_file_9.csv ^
        output_file.csv

This is tidier than performing the command on one line.

Using XPATH to search text containing  

It seems that OpenQA, guys behind Selenium, have already addressed this problem. They defined some variables to explicitely match whitespaces. In my case, I need to use an XPATH similar to //td[text()="${nbsp}"].

I reproduced here the text from OpenQA concerning this issue (found here):

HTML automatically normalizes whitespace within elements, ignoring leading/trailing spaces and converting extra spaces, tabs and newlines into a single space. When Selenium reads text out of the page, it attempts to duplicate this behavior, so you can ignore all the tabs and newlines in your HTML and do assertions based on how the text looks in the browser when rendered. We do this by replacing all non-visible whitespace (including the non-breaking space " ") with a single space. All visible newlines (<br>, <p>, and <pre> formatted new lines) should be preserved.

We use the same normalization logic on the text of HTML Selenese test case tables. This has a number of advantages. First, you don't need to look at the HTML source of the page to figure out what your assertions should be; " " symbols are invisible to the end user, and so you shouldn't have to worry about them when writing Selenese tests. (You don't need to put " " markers in your test case to assertText on a field that contains " ".) You may also put extra newlines and spaces in your Selenese <td> tags; since we use the same normalization logic on the test case as we do on the text, we can ensure that assertions and the extracted text will match exactly.

This creates a bit of a problem on those rare occasions when you really want/need to insert extra whitespace in your test case. For example, you may need to type text in a field like this: "foo ". But if you simply write <td>foo </td> in your Selenese test case, we'll replace your extra spaces with just one space.

This problem has a simple workaround. We've defined a variable in Selenese, ${space}, whose value is a single space. You can use ${space} to insert a space that won't be automatically trimmed, like this: <td>foo${space}${space}${space}</td>. We've also included a variable ${nbsp}, that you can use to insert a non-breaking space.

Note that XPaths do not normalize whitespace the way we do. If you need to write an XPath like //div[text()="hello world"] but the HTML of the link is really "hello world", you'll need to insert a real " " into your Selenese test case to get it to match, like this: //div[text()="hello${nbsp}world"].

How to convert a JSON string to a Map<String, String> with Jackson JSON

Warning you get is done by compiler, not by library (or utility method).

Simplest way using Jackson directly would be:

HashMap<String,Object> props;

// src is a File, InputStream, String or such
props = new ObjectMapper().readValue(src, new TypeReference<HashMap<String,Object>>() {});
// or:
props = (HashMap<String,Object>) new ObjectMapper().readValue(src, HashMap.class);
// or even just:
@SuppressWarnings("unchecked") // suppresses typed/untype mismatch warnings, which is harmless
props = new ObjectMapper().readValue(src, HashMap.class);

Utility method you call probably just does something similar to this.

Reference excel worksheet by name?

There are several options, including using the method you demonstrate, With, and using a variable.

My preference is option 4 below: Dim a variable of type Worksheet and store the worksheet and call the methods on the variable or pass it to functions, however any of the options work.

Sub Test()
  Dim SheetName As String
  Dim SearchText As String
  Dim FoundRange As Range

  SheetName = "test"      
  SearchText = "abc"

  ' 0. If you know the sheet is the ActiveSheet, you can use if directly.
  Set FoundRange = ActiveSheet.UsedRange.Find(What:=SearchText)
  ' Since I usually have a lot of Subs/Functions, I don't use this method often.
  ' If I do, I store it in a variable to make it easy to change in the future or
  ' to pass to functions, e.g.: Set MySheet = ActiveSheet
  ' If your methods need to work with multiple worksheets at the same time, using
  ' ActiveSheet probably isn't a good idea and you should just specify the sheets.

  ' 1. Using Sheets or Worksheets (Least efficient if repeating or calling multiple times)
  Set FoundRange = Sheets(SheetName).UsedRange.Find(What:=SearchText)
  Set FoundRange = Worksheets(SheetName).UsedRange.Find(What:=SearchText)

  ' 2. Using Named Sheet, i.e. Sheet1 (if Worksheet is named "Sheet1"). The
  ' sheet names use the title/name of the worksheet, however the name must
  ' be a valid VBA identifier (no spaces or special characters. Use the Object
  ' Browser to find the sheet names if it isn't obvious. (More efficient than #1)
  Set FoundRange = Sheet1.UsedRange.Find(What:=SearchText)

  ' 3. Using "With" (more efficient than #1)
  With Sheets(SheetName)
    Set FoundRange = .UsedRange.Find(What:=SearchText)
  End With
  ' or possibly...
  With Sheets(SheetName).UsedRange
    Set FoundRange = .Find(What:=SearchText)
  End With

  ' 4. Using Worksheet variable (more efficient than 1)
  Dim MySheet As Worksheet
  Set MySheet = Worksheets(SheetName)
  Set FoundRange = MySheet.UsedRange.Find(What:=SearchText)

  ' Calling a Function/Sub
  Test2 Sheets(SheetName) ' Option 1
  Test2 Sheet1 ' Option 2
  Test2 MySheet ' Option 4

End Sub

Sub Test2(TestSheet As Worksheet)
    Dim RowIndex As Long
    For RowIndex = 1 To TestSheet.UsedRange.Rows.Count
        If TestSheet.Cells(RowIndex, 1).Value = "SomeValue" Then
            ' Do something
        End If
    Next RowIndex
End Sub

How to change password using TortoiseSVN?

Replace the line in htpasswd file:

go to: http://www.htaccesstools.com/htpasswd-generator-windows/

(if the link is expired, search another generator from google.com)

Enter your username and password. The site will generate encrypted line. Copy that line and replace it with the previous line in the file "repo/htpasswd".

You might also need to 'clear' the 'Authentication data' from tortoisSVN -> settings -> saved data

Faster way to zero memory than with memset?

That's an interesting question. I made this implementation that is just slightly faster (but hardly measurable) when 32-bit release compiling on VC++ 2012. It probably can be improved on a lot. Adding this in your own class in a multithreaded environment would probably give you even more performance gains since there are some reported bottleneck problems with memset() in multithreaded scenarios.

// MemsetSpeedTest.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include "Windows.h"
#include <time.h>

#pragma comment(lib, "Winmm.lib") 
using namespace std;

/** a signed 64-bit integer value type */
#define _INT64 __int64

/** a signed 32-bit integer value type */
#define _INT32 __int32

/** a signed 16-bit integer value type */
#define _INT16 __int16

/** a signed 8-bit integer value type */
#define _INT8 __int8

/** an unsigned 64-bit integer value type */
#define _UINT64 unsigned _INT64

/** an unsigned 32-bit integer value type */
#define _UINT32 unsigned _INT32

/** an unsigned 16-bit integer value type */
#define _UINT16 unsigned _INT16

/** an unsigned 8-bit integer value type */
#define _UINT8 unsigned _INT8

/** maximum allo

wed value in an unsigned 64-bit integer value type */
    #define _UINT64_MAX 18446744073709551615ULL

#ifdef _WIN32

/** Use to init the clock */
#define TIMER_INIT LARGE_INTEGER frequency;LARGE_INTEGER t1, t2;double elapsedTime;QueryPerformanceFrequency(&frequency);

/** Use to start the performance timer */
#define TIMER_START QueryPerformanceCounter(&t1);

/** Use to stop the performance timer and output the result to the standard stream. Less verbose than \c TIMER_STOP_VERBOSE */
#define TIMER_STOP QueryPerformanceCounter(&t2);elapsedTime=(t2.QuadPart-t1.QuadPart)*1000.0/frequency.QuadPart;wcout<<elapsedTime<<L" ms."<<endl;
#else
/** Use to init the clock */
#define TIMER_INIT clock_t start;double diff;

/** Use to start the performance timer */
#define TIMER_START start=clock();

/** Use to stop the performance timer and output the result to the standard stream. Less verbose than \c TIMER_STOP_VERBOSE */
#define TIMER_STOP diff=(clock()-start)/(double)CLOCKS_PER_SEC;wcout<<fixed<<diff<<endl;
#endif    


void *MemSet(void *dest, _UINT8 c, size_t count)
{
    size_t blockIdx;
    size_t blocks = count >> 3;
    size_t bytesLeft = count - (blocks << 3);
    _UINT64 cUll = 
        c 
        | (((_UINT64)c) << 8 )
        | (((_UINT64)c) << 16 )
        | (((_UINT64)c) << 24 )
        | (((_UINT64)c) << 32 )
        | (((_UINT64)c) << 40 )
        | (((_UINT64)c) << 48 )
        | (((_UINT64)c) << 56 );

    _UINT64 *destPtr8 = (_UINT64*)dest;
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr8[blockIdx] = cUll;

    if (!bytesLeft) return dest;

    blocks = bytesLeft >> 2;
    bytesLeft = bytesLeft - (blocks << 2);

    _UINT32 *destPtr4 = (_UINT32*)&destPtr8[blockIdx];
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr4[blockIdx] = (_UINT32)cUll;

    if (!bytesLeft) return dest;

    blocks = bytesLeft >> 1;
    bytesLeft = bytesLeft - (blocks << 1);

    _UINT16 *destPtr2 = (_UINT16*)&destPtr4[blockIdx];
    for (blockIdx = 0; blockIdx < blocks; blockIdx++) destPtr2[blockIdx] = (_UINT16)cUll;

    if (!bytesLeft) return dest;

    _UINT8 *destPtr1 = (_UINT8*)&destPtr2[blockIdx];
    for (blockIdx = 0; blockIdx < bytesLeft; blockIdx++) destPtr1[blockIdx] = (_UINT8)cUll;

    return dest;
}

int _tmain(int argc, _TCHAR* argv[])
{
    TIMER_INIT

    const size_t n = 10000000;
    const _UINT64 m = _UINT64_MAX;
    const _UINT64 o = 1;
    char test[n];
    {
        cout << "memset()" << endl;
        TIMER_START;

        for (int i = 0; i < m ; i++)
            for (int j = 0; j < o ; j++)
                memset((void*)test, 0, n);  

        TIMER_STOP;
    }
    {
        cout << "MemSet() took:" << endl;
        TIMER_START;

        for (int i = 0; i < m ; i++)
            for (int j = 0; j < o ; j++)
                MemSet((void*)test, 0, n);

        TIMER_STOP;
    }

    cout << "Done" << endl;
    int wait;
    cin >> wait;
    return 0;
}

Output is as follows when release compiling for 32-bit systems:

memset() took:
5.569000
MemSet() took:
5.544000
Done

Output is as follows when release compiling for 64-bit systems:

memset() took:
2.781000
MemSet() took:
2.765000
Done

Here you can find the source code Berkley's memset(), which I think is the most common implementation.

What's the function like sum() but for multiplication? product()?

Use this

def prod(iterable):
    p = 1
    for n in iterable:
        p *= n
    return p

Since there's no built-in prod function.

Getting visitors country from their IP

I have written a class based on "Chandra Nakka" answer. Hopefully it can help people out it saves the information from geoplugin to a session so the load is much faster when recalling the information. It also saves the values to a private array so recalling in the same code is the fastest as it could be.

class Geo {
private $_ip = null;
private $_useSession = true;
private $_sessionNameData = 'GEO_SESSION_DATA';
private $_hasError = false;
private $_geoData = [];

const PURPOSE_SUPPORT = [
    "all", "*", "location",
    "request",
    "latitude", 
    "longitude",
    "accuracy",
    "timezonde",
    "currencycode",
    "currencysymbol",
    "currencysymbolutf8",
    "country", 
    "countrycode", 
    "state", "region", 
    "city", 
    "address",
    "continent", 
    "continentcode"
];
const CONTINENTS = [
    "AF" => "Africa",
    "AN" => "Antarctica",
    "AS" => "Asia",
    "EU" => "Europe",
    "OC" => "Australia (Oceania)",
    "NA" => "North America",
    "SA" => "South America"
];

function __construct($ip = null, $deepDetect = true, $useSession = true)
{
    // define the session useage within this class
    $this->_useSession = $useSession;
    $this->_startSession();

    // define a ip as far as possible
    $this->_ip = $this->_defineIP($ip, $deepDetect);

    // check if the ip was set
    if (!$this->_ip) {
        $this->_hasError = true;
        return $this;
    }

    // define the geoData
    $this->_geoData = $this->_fetchGeoData();

    return $this;
}

function get($purpose)
{
    // making sure its lowercase
    $purpose = strtolower($purpose);

    // makeing sure there are no error and the geodata is not empty
    if ($this->_hasError || !count($this->_geoData) && !in_array($purpose, self::PURPOSE_SUPPORT)) {
        return 'error';
    }

    if (in_array($purpose, ['*', 'all', 'location']))  {
        return $this->_geoData;
    }

    if ($purpose === 'state') $purpose = 'region';

    return (isset($this->_geoData[$purpose]) ? $this->_geoData[$purpose] : 'missing: '.$purpose);
}

private function _fetchGeoData()
{
    // check if geo data was set before
    if (count($this->_geoData)) {
        return $this->_geoData;
    }

    // check possible session
    if ($this->_useSession && ($sessionData = $this->_getSession($this->_sessionNameData))) {
        return $sessionData;
    }

    // making sure we have a valid ip
    if (!$this->_ip || $this->_ip === '127.0.0.1') {
        return [];
    }

    // fetch the information from geoplusing
    $ipdata = @json_decode($this->curl("http://www.geoplugin.net/json.gp?ip=" . $this->_ip));

    // check if the data was fetched
    if (!@strlen(trim($ipdata->geoplugin_countryCode)) === 2) {
        return [];
    }

    // make a address array
    $address = [$ipdata->geoplugin_countryName];
    if (@strlen($ipdata->geoplugin_regionName) >= 1)
        $address[] = $ipdata->geoplugin_regionName;
    if (@strlen($ipdata->geoplugin_city) >= 1)
        $address[] = $ipdata->geoplugin_city;

    // makeing sure the continentCode is upper case
    $continentCode = strtoupper(@$ipdata->geoplugin_continentCode);

    $geoData = [
        'request' => @$ipdata->geoplugin_request,
        'latitude' => @$ipdata->geoplugin_latitude,
        'longitude' => @$ipdata->geoplugin_longitude,
        'accuracy' => @$ipdata->geoplugin_locationAccuracyRadius,
        'timezonde' => @$ipdata->geoplugin_timezone,
        'currencycode' => @$ipdata->geoplugin_currencyCode,
        'currencysymbol' => @$ipdata->geoplugin_currencySymbol,
        'currencysymbolutf8' => @$ipdata->geoplugin_currencySymbol_UTF8,
        'city' => @$ipdata->geoplugin_city,
        'region' => @$ipdata->geoplugin_regionName,
        'country' => @$ipdata->geoplugin_countryName,
        'countrycode' => @$ipdata->geoplugin_countryCode,
        'continent' => self::CONTINENTS[$continentCode],
        'continentcode' => $continentCode,
        'address' => implode(", ", array_reverse($address))
    ];

    if ($this->_useSession) {
        $this->_setSession($this->_sessionNameData, $geoData);
    }

    return $geoData;
}

private function _startSession()
{
    // only start a new session when the status is 'none' and the class
    // requires a session
    if ($this->_useSession && session_status() === PHP_SESSION_NONE) {
        session_start();
    }
}

private function _defineIP($ip, $deepDetect)
{
    // check if the ip was set before
    if ($this->_ip) {
        return $this->_ip;
    }

    // check if the ip given is valid
    if (filter_var($ip, FILTER_VALIDATE_IP)) {
        return $ip;
    }

    // try to get the ip from the REMOTE_ADDR
    $ip = filter_input(INPUT_SERVER, 'REMOTE_ADDR', FILTER_VALIDATE_IP);

    // check if we need to end the search for a IP if the REMOTE_ADDR did not
    // return a valid and the deepDetect is false
    if (!$deepDetect) {
        return $ip;
    }

    // try to get the ip from HTTP_X_FORWARDED_FOR
    if (($ip = filter_input(INPUT_SERVER, 'HTTP_X_FORWARDED_FOR', FILTER_VALIDATE_IP))) {
        return $ip;
    }

    // try to get the ip from the HTTP_CLIENT_IP
    if (($ip = filter_input(INPUT_SERVER, 'HTTP_CLIENT_IP', FILTER_VALIDATE_IP))) {
        return $ip;
    }

    return $ip;
}

private function _hasSession($key, $filter = FILTER_DEFAULT) 
{
    return (isset($_SESSION[$key]) ? (bool)filter_var($_SESSION[$key], $filter) : false);
}

private function _getSession($key, $filter = FILTER_DEFAULT)
{
    if ($this->_hasSession($key, $filter)) {
        $value = filter_var($_SESSION[$key], $filter);

        if (@json_decode($value)) {
            return json_decode($value, true);
        }

        return filter_var($_SESSION[$key], $filter);
    } else {
        return false;
    }
}

private function _setSession($key, $value) 
{
    if (is_array($value)) {
        $value = json_encode($value);
    }

    $_SESSION[$key] = $value;
}

function emptySession($key) {
    if (!$this->_hasSession($key)) {
        return;
    }

    $_SESSION[$key] = null;
    unset($_SESSION[$key]);

}

function curl($url) 
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $output = curl_exec($ch);
    curl_close($ch);
    return $output;
}
}

Answering the 'op' question with this class you can call

$country = (new \Geo())->get('country'); // United Kingdom

And the other properties available are:

$geo = new \Geo('185.35.50.4');
var_dump($geo->get('*')); // allias all / location
var_dump($geo->get('country'));
var_dump($geo->get('countrycode'));
var_dump($geo->get('state')); // allias region
var_dump($geo->get('city')); 
var_dump($geo->get('address')); 
var_dump($geo->get('continent')); 
var_dump($geo->get('continentcode'));   
var_dump($geo->get('request'));
var_dump($geo->get('latitude'));
var_dump($geo->get('longitude'));
var_dump($geo->get('accuracy'));
var_dump($geo->get('timezonde'));
var_dump($geo->get('currencyCode'));
var_dump($geo->get('currencySymbol'));
var_dump($geo->get('currencySymbolUTF8'));

Returning

array(15) {
  ["request"]=>
  string(11) "185.35.50.4"
  ["latitude"]=>
  string(7) "51.4439"
  ["longitude"]=>
  string(7) "-0.1854"
  ["accuracy"]=>
  string(2) "50"
  ["timezonde"]=>
  string(13) "Europe/London"
  ["currencycode"]=>
  string(3) "GBP"
  ["currencysymbol"]=>
  string(2) "£"
  ["currencysymbolutf8"]=>
  string(2) "£"
  ["city"]=>
  string(10) "Wandsworth"
  ["region"]=>
  string(10) "Wandsworth"
  ["country"]=>
  string(14) "United Kingdom"
  ["countrycode"]=>
  string(2) "GB"
  ["continent"]=>
  string(6) "Europe"
  ["continentcode"]=>
  string(2) "EU"
  ["address"]=>
  string(38) "Wandsworth, Wandsworth, United Kingdom"
}
string(14) "United Kingdom"
string(2) "GB"
string(10) "Wandsworth"
string(10) "Wandsworth"
string(38) "Wandsworth, Wandsworth, United Kingdom"
string(6) "Europe"
string(2) "EU"
string(11) "185.35.50.4"
string(7) "51.4439"
string(7) "-0.1854"
string(2) "50"
string(13) "Europe/London"
string(3) "GBP"
string(2) "£"
string(2) "£"

Simulator or Emulator? What is the difference?

A Virtual PC tries to emulate a Computer, from the point of view of a Programmer BUT, at the same time, it simulates a Computer from the point of view of a Electrical Engineer.

Accessing localhost (xampp) from another computer over LAN network - how to?

Replace Require Local with Require all granted in xampp\apache\conf\extra\httpd-xampp.conf file.

How do you perform a left outer join using linq extension methods

Improving on Ocelot20's answer, if you have a table you're left outer joining with where you just want 0 or 1 rows out of it, but it could have multiple, you need to Order your joined table:

var qry = Foos.GroupJoin(
      Bars.OrderByDescending(b => b.Id),
      foo => foo.Foo_Id,
      bar => bar.Foo_Id,
      (f, bs) => new { Foo = f, Bar = bs.FirstOrDefault() });

Otherwise which row you get in the join is going to be random (or more specifically, whichever the db happens to find first).

check if file exists on remote host with ssh

ssh -q $HOST [[ -f $FILE_PATH ]] && echo "File exists"

The above will run the echo command on the machine you're running the ssh command from. To get the remote server to run the command:

ssh -q $HOST "[[ ! -f $FILE_PATH ]] && touch $FILE_PATH"

Calling Scalar-valued Functions in SQL

You are using an inline table value function. Therefore you must use Select * From function. If you want to use select function() you must use a scalar function.

https://msdn.microsoft.com/fr-fr/library/ms186755%28v=sql.120%29.aspx

Unable to Install Any Package in Visual Studio 2015

In my case, This problem was caused by a mismatch in my Target framework setting under each project. When I created a new project, VS 2015 defaulted to 4.5.2, however all my nuget packages were built for 4.6.

For some reason, VS 2015 was not showing me these errors. I didn't see them until I created a new empty project and tried to add my nuget project there. This behavior may have been aggravated because I had renamed the project a few times during the initial setup.

I solved the problem by

changing the Target Framework on my projects to 4.6
closed VS 2015
deleted "packages", "obj" and "bin" folders
re-open the solution and try to add the nuget package again.

UL or DIV vertical scrollbar

You need to define height of ul or your div and set overflow equals to auto as below:

<ul style="width: 300px; height: 200px; overflow: auto">
  <li>text</li>
  <li>text</li>

How can I format the output of a bash command in neat columns

Try

xargs -n2  printf "%-20s%s\n"

or even

xargs printf "%-20s%s\n"

if input is not very large.

how to save DOMPDF generated content to file?

<?php
$content='<table width="100%" border="1">';
$content.='<tr><th>name</th><th>email</th><th>contact</th><th>address</th><th>city</th><th>country</th><th>postcode</th></tr>';
for ($index = 0; $index < 10; $index++) { 
$content.='<tr><td>nadim</td><td>[email protected]</td><td>7737033665</td><td>247 dehligate</td><td>udaipur</td><td>india</td><td>313001</td></tr>';
}
$content.='</table>';
//$html = file_get_contents('pdf.php');
if(isset($_POST['pdf'])){
    require_once('./dompdf/dompdf_config.inc.php');
    $dompdf = new DOMPDF;                        
    $dompdf->load_html($content);
    $dompdf->render();
    $dompdf->stream("hello.pdf");
}
?>
<html>
    <body>
        <form action="#" method="post">        
            <button name="pdf" type="submit">export</button>
        <table width="100%" border="1">
           <tr><th>name</th><th>email</th><th>contact</th><th>address</th><th>city</th><th>country</th><th>postcode</th></tr>         
            <?php for ($index = 0; $index < 10; $index++) { ?>
            <tr><td>nadim</td><td>[email protected]</td><td>7737033665</td><td>247 dehligate</td><td>udaipur</td><td>india</td><td>313001</td></tr>
            <?php } ?>            
        </table>        
        </form>        
    </body>
</html>

Change connection string & reload app.config at run time

IIRC, the ConfigurationManager.RefreshSection requires a string parameter specifying the name of the Section to refresh :

ConfigurationManager.RefreshSection("connectionStrings");

I think that the ASP.NET application should automatically reload when the ConnectionStrings element is modified and the configuration does not need to be manually reloaded.

iCheck check if checkbox is checked

To know if the iCheck box is checked

var isChecked = $("#myicheckboxid").prop("checked");

Make iframe automatically adjust height according to the contents without using scrollbar?

The suggestion by hjpotter92 does not work in safari! I have made a small adjustment to the script so it now works in Safari as well.

Only change made is resetting height to 0 on every load in order to enable some browsers to decrease height.

Add this to <head> tag:

<script type="text/javascript">
  function resizeIframe(obj){
     obj.style.height = 0;
     obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
  }
</script>

And add the following onload attribute to your iframe, like so

<iframe onload='resizeIframe(this)'></iframe>

Android : How to set onClick event for Button in List item of ListView

This has been discussed in many posts but still I could not figure out a solution with:

android:focusable="false"
android:focusableInTouchMode="false"
android:focusableInTouchMode="false"

Below solution will work with any of the ui components : Button, ImageButtons, ImageView, Textview. LinearLayout, RelativeLayout clicks inside a listview cell and also will respond to onItemClick:

Adapter class - getview():

    @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;
            if (view == null) {
                view = lInflater.inflate(R.layout.my_ref_row, parent, false);
            }
            final Organization currentOrg = organizationlist.get(position).getOrganization();

            TextView name = (TextView) view.findViewById(R.id.name);
            Button btn = (Button) view.findViewById(R.id.btn_check);
            btn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    context.doSelection(currentOrg);

                }
            });

       if(currentOrg.isSelected()){
            btn.setBackgroundResource(R.drawable.sub_search_tick);
        }else{
            btn.setBackgroundResource(R.drawable.sub_search_tick_box);
        }

    }

In this was you can get the button clicked object to the activity. (Specially when you want the button to act as a check box with selected and non-selected states):

    public void doSelection(Organization currentOrg) {
        Log.e("Btn clicked ", currentOrg.getOrgName());
        if (currentOrg.isSelected() == false) {
            currentOrg.setSelected(true);
        } else {
            currentOrg.setSelected(false);
        }
        adapter.notifyDataSetChanged();

    }

Tomcat 404 error: The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

Hope this helps. From eclipse, you right click the project -> Run As -> Run on Server and then it worked for me. I used Eclipse Jee Neon and Apache Tomcat 9.0. :)

I just removed the head portion in index.html file and it worked fine.This is the head tag in html file

How to convert Json array to list of objects in c#

As others have already pointed out, the reason you are not getting the results you expect is because your JSON does not match the class structure that you are trying to deserialize into. You either need to change your JSON or change your classes. Since others have already shown how to change the JSON, I will take the opposite approach here.

To match the JSON you posted in your question, your classes should be defined like those below. Notice I've made the following changes:

I added a Wrapper class corresponding to the outer object in your JSON.
I changed the Values property of the ValueSet class from a List<Value> to a Dictionary<string, Value> since the values property in your JSON contains an object, not an array.
I added some additional [JsonProperty] attributes to match the property names in your JSON objects.

Class definitions:

class Wrapper
{
    [JsonProperty("JsonValues")]
    public ValueSet ValueSet { get; set; }
}

class ValueSet
{
    [JsonProperty("id")]
    public string Id { get; set; }
    [JsonProperty("values")]
    public Dictionary<string, Value> Values { get; set; }
}

class Value
{
    [JsonProperty("id")]
    public string Id { get; set; }
    [JsonProperty("diaplayName")]
    public string DisplayName { get; set; }
}

You need to deserialize into the Wrapper class, not the ValueSet class. You can then get the ValueSet from the Wrapper.

var valueSet = JsonConvert.DeserializeObject<Wrapper>(jsonString).ValueSet;

Here is a working program to demonstrate:

class Program
{
    static void Main(string[] args)
    {
        string jsonString = @"
        {
            ""JsonValues"": {
                ""id"": ""MyID"",
                ""values"": {
                    ""value1"": {
                        ""id"": ""100"",
                        ""diaplayName"": ""MyValue1""
                    },
                    ""value2"": {
                        ""id"": ""200"",
                        ""diaplayName"": ""MyValue2""
                    }
                }
            }
        }";

        var valueSet = JsonConvert.DeserializeObject<Wrapper>(jsonString).ValueSet;

        Console.WriteLine("id: " + valueSet.Id);
        foreach (KeyValuePair<string, Value> kvp in valueSet.Values)
        {
            Console.WriteLine(kvp.Key + " id: " + kvp.Value.Id);
            Console.WriteLine(kvp.Key + " name: " + kvp.Value.DisplayName);
        }
    }
}

And here is the output:

id: MyID
value1 id: 100
value1 name: MyValue1
value2 id: 200
value2 name: MyValue2

Button Listener for button in fragment in android

    //sure run it i will also test it
//we make a class that extends with the fragment
    public class Example_3_1 extends Fragment  implements OnClickListener
    {
       View vi;
        EditText t;
        EditText t1;
        Button bu;
 // that are by defult function of fragment extend class
     @Override
       public View onCreateView(LayoutInflater inflater,ViewGroup container,BundlesavedInstanceState) 
       {        
           vi=inflater.inflate(R.layout.example_3_1, container, false);// load the xml file 
           bu=(Button) vi.findViewById(R.id.button1);// get button id from example_3_1 xml file
           bu.setOnClickListener(this); //on button appay click listner
           t=(EditText) vi.findViewById(R.id.editText1);// id get from example_3_1 xml file
           t1=(EditText) vi.findViewById(R.id.editText2);
          return vi; // return the view object,that set the xml file  example_3_1 xml file
       }
       @Override
       public void onClick(View v)//on button click that called
       {

          switch(v.getId())// on run time get id what button os click and get id
          {
          case R.id.button1:        // it mean if button1 click then this work
           t.setText("UMTien");     //set text 
           t1.setText("programming");
           break;
          }
    }     }

how to create insert new nodes in JsonNode?

I've recently found even more interesting way to create any ValueNode or ContainerNode (Jackson v2.3).

ObjectNode node = JsonNodeFactory.instance.objectNode();

Javascript - Track mouse position

Just a simplified version of @T.J. Crowder and @RegarBoy's answers.

Less is more in my opinion.

Check out onmousemove event for more info about the event.

There's a new value of posX and posY every time the mouse moves according to the horizontal and vertical coordinates.

<!DOCTYPE html>
    <html>
    <head>
      <meta charset="utf-8">
      <title>Example Mouse Tracker</title>
      <style>    
        body {height: 3000px;}
        .dot {width: 2px;height: 2px;background-color: black;position: absolute;}
      </style>
    </head>
    <body>
    <p>Mouse tracker</p>
    <script>
    onmousemove = function(e){
        //Logging purposes
        console.log("mouse location:", e.clientX, e.clientY);

        //meat and potatoes of the snippet
        var pos = e;
        var dot;
        dot = document.createElement('div');
        dot.className = "dot";
        dot.style.left = pos.x + "px";
        dot.style.top = pos.y + "px";
        document.body.appendChild(dot);
    }      
    </script>
    </body>
    </html>

CMake unable to determine linker language with C++

I also faced a similar error while compiling my C-based code. I fixed the issue by correcting the source file path in my cmake file. Please check the source file path of each source file mentioned in your cmake file. This might help you too.

How to convert a structure to a byte array in C#?

Variant of the code of Vicent with one less memory allocation:

public static byte[] GetBytes<T>(T str)
{
    int size = Marshal.SizeOf(str);

    byte[] arr = new byte[size];

    GCHandle h = default(GCHandle);

    try
    {
        h = GCHandle.Alloc(arr, GCHandleType.Pinned);

        Marshal.StructureToPtr<T>(str, h.AddrOfPinnedObject(), false);
    }
    finally
    {
        if (h.IsAllocated)
        {
            h.Free();
        }
    }

    return arr;
}

public static T FromBytes<T>(byte[] arr) where T : struct
{
    T str = default(T);

    GCHandle h = default(GCHandle);

    try
    {
        h = GCHandle.Alloc(arr, GCHandleType.Pinned);

        str = Marshal.PtrToStructure<T>(h.AddrOfPinnedObject());

    }
    finally
    {
        if (h.IsAllocated)
        {
            h.Free();
        }
    }

    return str;
}

I use GCHandle to "pin" the memory and then I use directly its address with h.AddrOfPinnedObject().

hash function for string

Wikipedia shows a nice string hash function called Jenkins One At A Time Hash. It also quotes improved versions of this hash.

uint32_t jenkins_one_at_a_time_hash(char *key, size_t len)
{
    uint32_t hash, i;
    for(hash = i = 0; i < len; ++i)
    {
        hash += key[i];
        hash += (hash << 10);
        hash ^= (hash >> 6);
    }
    hash += (hash << 3);
    hash ^= (hash >> 11);
    hash += (hash << 15);
    return hash;
}

what's the easiest way to put space between 2 side-by-side buttons in asp.net

There is another way of doing so:

<span style="width: 10px"></span>

You can adjust the amount of space using the width property.

Your code would be:

<div style="text-align: center"> 
    <asp:Button ID="btnSubmit" runat="server" Text="Submit" Width="89px" OnClick="btnSubmit_Click" />
    <span style="width: 10px"></span>
    <asp:Button ID="btnClear" runat="server" Text="Clear" Width="89px" OnClick="btnClear_Click" />
</div>

Change cursor to hand when mouse goes over a row in table

Convert pyQt UI to python

The question has already been answered, but if you are looking for a shortcut during development, including this at the top of your python script will save you some time but mostly let you forget about actually having to make the conversion.

import os #Used in Testing Script
os.system("pyuic4 -o outputFile.py inpuiFile.ui")

Regular Expression: Any character that is NOT a letter or number

To match anything other than letter or number you could try this:

[^a-zA-Z0-9]

And to replace:

var str = 'dfj,dsf7lfsd .sdklfj';
str = str.replace(/[^A-Za-z0-9]/g, ' ');

JUnit test for System.out.println()

Based on @dfa's answer and another answer that shows how to test System.in, I would like to share my solution to give an input to a program and test its output.

As a reference, I use JUnit 4.12.

Let's say we have this program that simply replicates input to output:

import java.util.Scanner;

public class SimpleProgram {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print(scanner.next());
        scanner.close();
    }
}

To test it, we can use the following class:

import static org.junit.Assert.*;

import java.io.*;

import org.junit.*;

public class SimpleProgramTest {
    private final InputStream systemIn = System.in;
    private final PrintStream systemOut = System.out;

    private ByteArrayInputStream testIn;
    private ByteArrayOutputStream testOut;

    @Before
    public void setUpOutput() {
        testOut = new ByteArrayOutputStream();
        System.setOut(new PrintStream(testOut));
    }

    private void provideInput(String data) {
        testIn = new ByteArrayInputStream(data.getBytes());
        System.setIn(testIn);
    }

    private String getOutput() {
        return testOut.toString();
    }

    @After
    public void restoreSystemInputOutput() {
        System.setIn(systemIn);
        System.setOut(systemOut);
    }

    @Test
    public void testCase1() {
        final String testString = "Hello!";
        provideInput(testString);

        SimpleProgram.main(new String[0]);

        assertEquals(testString, getOutput());
    }
}

I won't explain much, because I believe the code is readable and I cited my sources.

When JUnit runs testCase1(), it is going to call the helper methods in the order they appear:

setUpOutput(), because of the @Before annotation
provideInput(String data), called from testCase1()
getOutput(), called from testCase1()
restoreSystemInputOutput(), because of the @After annotation

I didn't test System.err because I didn't need it, but it should be easy to implement, similar to testing System.out.

Cannot resolve symbol AppCompatActivity - Support v7 libraries aren't recognized?

File->Invalidate Caches/Restart works for me.

Failed loading english.pickle with nltk.data.load

This is what worked for me just now:

# Do this in a separate python interpreter session, since you only have to do it once
import nltk
nltk.download('punkt')

# Do this in your ipython notebook or analysis script
from nltk.tokenize import word_tokenize

sentences = [
    "Mr. Green killed Colonel Mustard in the study with the candlestick. Mr. Green is not a very nice fellow.",
    "Professor Plum has a green plant in his study.",
    "Miss Scarlett watered Professor Plum's green plant while he was away from his office last week."
]

sentences_tokenized = []
for s in sentences:
    sentences_tokenized.append(word_tokenize(s))

sentences_tokenized is a list of a list of tokens:

[['Mr.', 'Green', 'killed', 'Colonel', 'Mustard', 'in', 'the', 'study', 'with', 'the', 'candlestick', '.', 'Mr.', 'Green', 'is', 'not', 'a', 'very', 'nice', 'fellow', '.'],
['Professor', 'Plum', 'has', 'a', 'green', 'plant', 'in', 'his', 'study', '.'],
['Miss', 'Scarlett', 'watered', 'Professor', 'Plum', "'s", 'green', 'plant', 'while', 'he', 'was', 'away', 'from', 'his', 'office', 'last', 'week', '.']]

The sentences were taken from the example ipython notebook accompanying the book "Mining the Social Web, 2nd Edition"

What is the size of ActionBar in pixels?

One of the Honeycomb samples refers to ?android:attr/actionBarSize

Drop-down box dependent on the option selected in another drop-down box

for this, I have noticed that it far better to show and hide the tags instead of adding and removing them for the DOM. It performs better that way.

Get column index from column name in python pandas

Here is a solution through list comprehension. cols is the list of columns to get index for:

[df.columns.get_loc(c) for c in cols if c in df]

How to find the difference in days between two dates?

echo $(date +%d/%h/%y) date_today
echo " The other date is 1970/01/01"
TODAY_DATE="1970-01-01"
BEFORE_DATE=$(date +%d%h%y)
echo "THE DIFFERNS IS " $(( ($(date -d $BEFORE_DATE +%s) - $(date -d $TODAY_DATE +%s)) )) SECOUND

use it to get your date today and your sec since the date you want. if you want it with days just divide it with 86400

echo $(date +%d/%h/%y) date_today
echo " The other date is 1970/01/01"
TODAY_DATE="1970-01-01"
BEFORE_DATE=$(date +%d%h%y)
echo "THE DIFFERNS IS " $(( ($(date -d $BEFORE_DATE +%s) - $(date -d $TODAY_DATE +%s))/ 86400)) SECOUND

how to set font size based on container size?

If you want to scale it depending on the element width, you can use this web component:
https://github.com/pomber/full-width-text

Check the demo here:
https://pomber.github.io/full-width-text/

The usage is like this:

<full-width-text>Lorem Ipsum</full-width-text>

SQL Server: Get data for only the past year

Well, I think something is missing here. User wants to get data from the last year and not from the last 365 days. There is a huge diference. In my opinion, data from the last year is every data from 2007 (if I am in 2008 now). So the right answer would be:

SELECT ... FROM ... WHERE YEAR(DATE) = YEAR(GETDATE()) - 1

Then if you want to restrict this query, you can add some other filter, but always searching in the last year.

SELECT ... FROM ... WHERE YEAR(DATE) = YEAR(GETDATE()) - 1 AND DATE > '05/05/2007'

node.js - how to write an array to file

Remember you can access good old ECMAScript APIs, in this case, JSON.stringify().

For simple arrays like the one in your example:

require('fs').writeFile(

    './my.json',

    JSON.stringify(myArray),

    function (err) {
        if (err) {
            console.error('Crap happens');
        }
    }
);

How to set Apache Spark Executor memory

Since you are running Spark in local mode, setting spark.executor.memory won't have any effect, as you have noticed. The reason for this is that the Worker "lives" within the driver JVM process that you start when you start spark-shell and the default memory used for that is 512M. You can increase that by setting spark.driver.memory to something higher, for example 5g. You can do that by either:

setting it in the properties file (default is $SPARK_HOME/conf/spark-defaults.conf),
```
spark.driver.memory              5g
```
or by supplying configuration setting at runtime
```
$ ./bin/spark-shell --driver-memory 5g
```

Note that this cannot be achieved by setting it in the application, because it is already too late by then, the process has already started with some amount of memory.

The reason for 265.4 MB is that Spark dedicates spark.storage.memoryFraction * spark.storage.safetyFraction to the total amount of storage memory and by default they are 0.6 and 0.9.

512 MB * 0.6 * 0.9 ~ 265.4 MB

So be aware that not the whole amount of driver memory will be available for RDD storage.

But when you'll start running this on a cluster, the spark.executor.memory setting will take over when calculating the amount to dedicate to Spark's memory cache.

C++ - How to append a char to char*?

char ch = 't';
char chArray[2];
sprintf(chArray, "%c", ch);
char chOutput[10]="tes";
strcat(chOutput, chArray);
cout<<chOutput;

OUTPUT:

test

Difference between logical addresses, and physical addresses?

This answer is by no means exhaustive but it may explain it enough to make things click.

In virtual memory systems, there is a disconnect between logical and physical addresses.

An application can be given a virtual address space of (let's say) 4G. This is its usable memory and it's free to use it as it sees fit. It's a nice contiguous block of memory (from the point of view of the application).

However, it is not the only application running, and the OS has to mediate between them all. Underneath that nice contiguous model, there is a lot of mapping going on to convert logical to physical addresses.

With this mapping, the OS and hardware (I'll just call these the lower layers from here on in) is free to put the application pages anywhere it wants (either in physical memory or swapped out to secondary storage).

When the application tries to access memory at logical address 50, the lower levels can translate that to a physical address using translation tables. And, if it tries to access logical memory that's been swapped out to disk, a page fault is raised and the lower levels can bring the relevant data back into memory, at whatever physical address it wants.

In the bad old days when physical addresses were all you had, code had to be relocatable (or fixed up on load) since it could load anywhere. With virtual memory, that code (and data) can be at logical memory location 50 in a dozen different processes at the same time - it's actual physical address will be different however.

It can even be shared so that one physical copy exists in the address space of many processes at once. This is the crux of shared code (so we don't use more physical memory than we need) and shared memory to allow easy inter-process communication).

It is, of course, less efficient than a pure physical-address environment but the CPU manufacturers try to make it as insanely efficient as possible, since it's used heavily. The advantages far outweigh the disadvantages.

PHP Create and Save a txt file to root directory

fopen() will open a resource in the same directory as the file executing the command. In other words, if you're just running the file ~/test.php, your script will create ~/myText.txt.

This can get a little confusing if you're using any URL rewriting (such as in an MVC framework) as it will likely create the new file in whatever the directory contains the root index.php file.

Also, you must have correct permissions set and may want to test before writing to the file. The following would help you debug:

$fp = fopen("myText.txt","wb");
if( $fp == false ){
    //do debugging or logging here
}else{
    fwrite($fp,$content);
    fclose($fp);
}

How to create a file in Android?

I decided to write a class from this thread that may be helpful to others. Note that this is currently intended to write in the "files" directory only (e.g. does not write to "sdcard" paths).

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import android.content.Context;

public class AndroidFileFunctions {

    public static String getFileValue(String fileName, Context context) {
        try {
            StringBuffer outStringBuf = new StringBuffer();
            String inputLine = "";
            /*
             * We have to use the openFileInput()-method the ActivityContext
             * provides. Again for security reasons with openFileInput(...)
             */
            FileInputStream fIn = context.openFileInput(fileName);
            InputStreamReader isr = new InputStreamReader(fIn);
            BufferedReader inBuff = new BufferedReader(isr);
            while ((inputLine = inBuff.readLine()) != null) {
                outStringBuf.append(inputLine);
                outStringBuf.append("\n");
            }
            inBuff.close();
            return outStringBuf.toString();
        } catch (IOException e) {
            return null;
        }
    }

    public static boolean appendFileValue(String fileName, String value,
            Context context) {
        return writeToFile(fileName, value, context, Context.MODE_APPEND);
    }

    public static boolean setFileValue(String fileName, String value,
            Context context) {
        return writeToFile(fileName, value, context,
                Context.MODE_WORLD_READABLE);
    }

    public static boolean writeToFile(String fileName, String value,
            Context context, int writeOrAppendMode) {
        // just make sure it's one of the modes we support
        if (writeOrAppendMode != Context.MODE_WORLD_READABLE
                && writeOrAppendMode != Context.MODE_WORLD_WRITEABLE
                && writeOrAppendMode != Context.MODE_APPEND) {
            return false;
        }
        try {
            /*
             * We have to use the openFileOutput()-method the ActivityContext
             * provides, to protect your file from others and This is done for
             * security-reasons. We chose MODE_WORLD_READABLE, because we have
             * nothing to hide in our file
             */
            FileOutputStream fOut = context.openFileOutput(fileName,
                    writeOrAppendMode);
            OutputStreamWriter osw = new OutputStreamWriter(fOut);
            // Write the string to the file
            osw.write(value);
            // save and close
            osw.flush();
            osw.close();
        } catch (IOException e) {
            return false;
        }
        return true;
    }

    public static void deleteFile(String fileName, Context context) {
        context.deleteFile(fileName);
    }
}

Is there a timeout for idle PostgreSQL connections?

A possible workaround that allows to enable database session timeout without an external scheduled task is to use the extension pg_timeout that I have developped.

PHP compare two arrays and get the matched values not the difference

I think the better answer for this questions is

array_diff()

because it Compares array against one or more other arrays and returns the values in array that are not present in any of the other arrays.

Whereas

array_intersect() returns an array containing all the values of array that are present in all the arguments. Note that keys are preserved.

How can I tell how many objects I've stored in an S3 bucket?

You can easily get the total count and the history if you go to the s3 console "Management" tab and then click on "Metrics"... Screen shot of the tab

Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

If you're using IIS Express, it creates a new configuration for each site that you run, and it's bound to the url (host/port). However, when it opens a new project using the same port it doesn't refresh the configuration.

This means that if you have a project using CLR 2.0 (.NET Framework 2.0 to 3.5) running on some port and then later you open another project in the same port using CLR 4 (.NET Framework 4.x+) the new project will try to run using CLR 2, which fails - and in case it doesn't even recognize the "targetFramework" attribute.

One solution is cleaning IIS Express sites, but the easiest method is changing the port so that IIS Express will create a new site (using CLR 4) for your project.

Java generics: multiple generic parameters?

a and b must both be sets of the same type. But nothing prevents you from writing

myfunction(Set<X> a, Set<Y> b)

how to pass parameters to query in SQL (Excel)

It depends on the database to which you're trying to connect, the method by which you created the connection, and the version of Excel that you're using. (Also, most probably, the version of the relevant ODBC driver on your computer.)

The following examples are using SQL Server 2008 and Excel 2007, both on my local machine.

When I used the Data Connection Wizard (on the Data tab of the ribbon, in the Get External Data section, under From Other Sources), I saw the same thing that you did: the Parameters button was disabled, and adding a parameter to the query, something like select field from table where field2 = ?, caused Excel to complain that the value for the parameter had not been specified, and the changes were not saved.

When I used Microsoft Query (same place as the Data Connection Wizard), I was able to create parameters, specify a display name for them, and enter values each time the query was run. Bringing up the Connection Properties for that connection, the Parameters... button is enabled, and the parameters can be modified and used as I think you want.

I was also able to do this with an Access database. It seems reasonable that Microsoft Query could be used to create parameterized queries hitting other types of databases, but I can't easily test that right now.

Unable to Resolve Module in React Native App

In my case I needed to import using an extended file path

i.e:

WRONG: import MyComponent from "componentFolder/myComponent";

RIGHT: import MyComponent from "../myAppFolder/componentFolder/myComponent";

Both of these showed no Typescript errors, but only the bottom one worked.

How to get domain URL and application name?

The web application name (actually the context path) is available by calling HttpServletrequest#getContextPath() (and thus NOT getServletPath() as one suggested before). You can retrieve this in JSP by ${pageContext.request.contextPath}.

<p>The context path is: ${pageContext.request.contextPath}.</p>

If you intend to use this for all relative paths in your JSP page (which would make this question more sense), then you can make use of the HTML <base> tag:

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<c:set var="req" value="${pageContext.request}" />
<c:set var="url">${req.requestURL}</c:set>
<c:set var="uri" value="${req.requestURI}" />

<!doctype html>
<html lang="en">
    <head>
        <title>SO question 2204870</title>
        <base href="${fn:substring(url, 0, fn:length(url) - fn:length(uri))}${req.contextPath}/">
        <script src="js/global.js"></script>
        <link rel="stylesheet" href="css/global.css">
    </head>
    <body>
        <ul>
            <li><a href="home.jsp">Home</a></li>
            <li><a href="faq.jsp">FAQ</a></li>
            <li><a href="contact.jsp">Contact</a></li>
        </ul>
    </body>
</html>

All links in the page will then automagically be relative to the <base> so that you don't need to copypaste the context path everywhere. Note that when relative links start with a /, then they will not be relative to the <base> anymore, but to the domain root instead.

SimpleDateFormat parsing date with 'Z' literal

The time zone should be something like "GMT+00:00" or 0000 in order to be properly parsed by the SimpleDateFormat - you can replace Z with this construction.

Update multiple rows with different values in a single SQL query

Yes, you can do this, but I doubt that it would improve performances, unless your query has a real large latency.

You could do:

 UPDATE table SET posX=CASE
      WHEN id=id[1] THEN posX[1]
      WHEN id=id[2] THEN posX[2]
      ...
      ELSE posX END, posY = CASE ... END
 WHERE id IN (id[1], id[2], id[3]...);

The total cost is given more or less by: NUM_QUERIES * ( COST_QUERY_SETUP + COST_QUERY_PERFORMANCE ). This way, you knock down a bit on NUM_QUERIES, but COST_QUERY_PERFORMANCE goes up bigtime. If COST_QUERY_SETUP is really huge (e.g., you're calling some network service which is real slow) then, yes, you might still end up on top.

Otherwise, I'd try with indexing on id, or modifying the architecture.

In MySQL I think you could do this more easily with a multiple INSERT ON DUPLICATE KEY UPDATE (but am not sure, never tried).

How do I dynamically change the content in an iframe using jquery?

If you just want to change where the iframe points to and not the actual content inside the iframe, you would just need to change the src attribute.

 $("#myiframe").attr("src", "newwebpage.html");

"The import org.springframework cannot be resolved."

org.springframework.beans.factory.support.beannamegenerator , was my error. I did a maven clean, maven build etc., which was not useful and I found that my .m2 folder is not present in my eclipse installation folder. I found the .m2 folder out side of the eclipse folder which I pasted in the eclipse folder and then in eclipse I happened to do this :-

Open configure build path maven Java EE integration Select Maven archiver generates files under the build directory apply and close

My project is up and running now.

Is it possible to run an .exe or .bat file on 'onclick' in HTML

No, that would be a huge security breach. Imagine if someone could run

format c:

whenever you visted their website.

How to .gitignore all files/folder in a folder, but not the folder itself?

Put this .gitignore into the folder, then git add .gitignore.

*
*/
!.gitignore

The * line tells git to ignore all files in the folder, but !.gitignore tells git to still include the .gitignore file. This way, your local repository and any other clones of the repository all get both the empty folder and the .gitignore it needs.

Edit: May be obvious but also add */ to the .gitignore to also ignore subfolders.

How do you increase the max number of concurrent connections in Apache?

change the MaxClients directive. it is now on 256.

"Correct" way to specifiy optional arguments in R functions

You could also use missing() to test whether or not the argument y was supplied:

fooBar <- function(x,y){
    if(missing(y)) {
        x
    } else {
        x + y
    }
}

fooBar(3,1.5)
# [1] 4.5
fooBar(3)
# [1] 3

How to identify platform/compiler from preprocessor macros?

Here's what I use:

#ifdef _WIN32 // note the underscore: without it, it's not msdn official!
    // Windows (x64 and x86)
#elif __unix__ // all unices, not all compilers
    // Unix
#elif __linux__
    // linux
#elif __APPLE__
    // Mac OS, not sure if this is covered by __posix__ and/or __unix__ though...
#endif

EDIT: Although the above might work for the basics, remember to verify what macro you want to check for by looking at the Boost.Predef reference pages. Or just use Boost.Predef directly.

How to check if a JavaScript variable is NOT undefined?

var lastname = "Hi";

if(typeof lastname !== "undefined")
{
  alert("Hi. Variable is defined.");
}

R plot: size and resolution

A reproducible example:

the_plot <- function()
{
  x <- seq(0, 1, length.out = 100)
  y <- pbeta(x, 1, 10)
  plot(
    x,
    y,
    xlab = "False Positive Rate",
    ylab = "Average true positive rate",
    type = "l"
  )
}

James's suggestion of using pointsize, in combination with the various cex parameters, can produce reasonable results.

png(
  "test.png",
  width     = 3.25,
  height    = 3.25,
  units     = "in",
  res       = 1200,
  pointsize = 4
)
par(
  mar      = c(5, 5, 2, 2),
  xaxs     = "i",
  yaxs     = "i",
  cex.axis = 2,
  cex.lab  = 2
)
the_plot()
dev.off()

Of course the better solution is to abandon this fiddling with base graphics and use a system that will handle the resolution scaling for you. For example,

library(ggplot2)

ggplot_alternative <- function()
{
  the_data <- data.frame(
    x <- seq(0, 1, length.out = 100),
    y = pbeta(x, 1, 10)
  )

ggplot(the_data, aes(x, y)) +
    geom_line() +
    xlab("False Positive Rate") +
    ylab("Average true positive rate") +
    coord_cartesian(0:1, 0:1)
}

ggsave(
  "ggtest.png",
  ggplot_alternative(),
  width = 3.25,
  height = 3.25,
  dpi = 1200
)

Using two values for one switch case statement

The case values are just codeless "goto" points that can share the same entry point:

case text1:
case text4: {
//Do something
break;
}

Note that the braces are redundant.

Change User Agent in UIWebView

By pooling the answer by Louis St-Amour and the NSUserDefaults+UnRegisterDefaults category from this question/answer, you can use the following methods to start and stop user-agent spoofing at any time while your app is running:

#define kUserAgentKey @"UserAgent"

- (void)startSpoofingUserAgent:(NSString *)userAgent {
    [[NSUserDefaults standardUserDefaults] registerDefaults:@{ kUserAgentKey : userAgent }];
}

- (void)stopSpoofingUserAgent {
    [[NSUserDefaults standardUserDefaults] unregisterDefaultForKey:kUserAgentKey];
}

How to run test methods in specific order in JUnit4?

Please check out this one: https://github.com/TransparentMarket/junit. It runs the test in the order they are specified (defined within the compiled class file). Also it features a AllTests suite to run tests defined by sub package first. Using the AllTests implementation one can extend the solution in also filtering for properties (we used to use @Fast annotations but those were not published yet).

A simple command line to download a remote maven2 artifact to the local repository?

Since version 2.1 of the Maven Dependency Plugin, there is a dependency:get goal for this purpose. To make sure you are using the right version of the plugin, you'll need to use the "fully qualified name":

mvn org.apache.maven.plugins:maven-dependency-plugin:2.1:get \
    -DrepoUrl=http://download.java.net/maven/2/ \
    -Dartifact=robo-guice:robo-guice:0.4-SNAPSHOT

How to check not in array element

$id = $access_data['Privilege']['id']; 

if(!in_array($id,$user_access_arr));
    $user_access_arr[] = $id;
    $this->Session->setFlash(__('Access Denied! You are not eligible to access this.'), 'flash_custom_success');
    return $this->redirect(array('controller'=>'Dashboard','action'=>'index'));

Android Studio: “Execution failed for task ':app:mergeDebugResources'” if project is created on drive C:

This is caused by the path length restriction. I think it's 256 characters maximum.

Relocate your project and the build will succeed.

Python function as a function argument?

Yes, it's allowed.
You use the function as you would any other: anotherfunc(*extraArgs)

How to get the name of the current Windows user in JavaScript

If the script is running on Microsoft Windows in an HTA or similar, you can do this:

var wshshell=new ActiveXObject("wscript.shell");
var username=wshshell.ExpandEnvironmentStrings("%username%");

Otherwise, as others have pointed out, you're out of luck. This is considered to be private information and is not provided by the browser to the javascript engine.

Unable to create Genymotion Virtual Device

Disadvantage of deleting the deployed and .ova files is obvious i.e. you have to download the massive 200mb image again. A better choice is to :

Open genymotion and open settings --> virtualBox --> virtual devices browse and set the path to a folder which can be completely accessed without administrative pivileges e.g. for ubuntu set virtual devices path to any folder in your home directory for example /home/user/deployed and for windows you can use a folder like C://deployed.

That's it . Now you can use your already existing .ova file again to deploy image to new locatioin without any problem.

How is "mvn clean install" different from "mvn install"?

To stick with the Maven terms:

"clean" is a phase of the clean lifecycle
"install" is a phase of the default lifecycle

http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html#Lifecycle_Reference

Is JVM ARGS '-Xms1024m -Xmx2048m' still useful in Java 8?

Due to PermGen removal some options were removed (like -XX:MaxPermSize), but options -Xms and -Xmx work in Java 8. It's possible that under Java 8 your application simply needs somewhat more memory. Try to increase -Xmx value. Alternatively you can try to switch to G1 garbage collector using -XX:+UseG1GC.

Note that if you use any option which was removed in Java 8, you will see a warning upon application start:

$ java -XX:MaxPermSize=128M -version
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128M; support was removed in 8.0
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b18)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

How do you set up use HttpOnly cookies in PHP

Explanation here from Ilia... 5.2 only though

httpOnly cookie flag support in PHP 5.2

As stated in that article, you can set the header yourself in previous versions of PHP

header("Set-Cookie: hidden=value; httpOnly");

MacOS Xcode CoreSimulator folder very big. Is it ok to delete content?

That directory is part of your user data and you can delete any user data without affecting Xcode seriously. You can delete the whole CoreSimulator/ directory. Xcode will recreate fresh instances there for you when you do your next simulator run. If you can afford losing any previous simulator data of your apps this is the easy way to get space.

Update: A related useful app is "DevCleaner for Xcode" https://apps.apple.com/app/devcleaner-for-xcode/id1388020431

How do you perform address validation?

For US addresses you can require a valid state, and verify that the zip is valid. You could even check that the zip code is in the right state, but beyond that I don't think there are many tests you could run that wouldn't provide a lot of false negatives.

What are you trying to do -- prevent simple mistakes or enforcing some kind of identity check?

How to make an HTML back link?

You can also use history.back() alongside document.write() to show link only when there is actually somewhere to go back to:

<script>
  if (history.length > 1) {
    document.write('<a href="javascript:history.back()">Go back</a>');
  }
</script>

How to choose an AWS profile when using boto3 to connect to CloudFront

I think the docs aren't wonderful at exposing how to do this. It has been a supported feature for some time, however, and there are some details in this pull request.

So there are three different ways to do this:

Option A) Create a new session with the profile

    dev = boto3.session.Session(profile_name='dev')

Option B) Change the profile of the default session in code

    boto3.setup_default_session(profile_name='dev')

Option C) Change the profile of the default session with an environment variable

    $ AWS_PROFILE=dev ipython
    >>> import boto3
    >>> s3dev = boto3.resource('s3')

Convert normal date to unix timestamp

_x000D_

var d = '2016-01-01T00:00:00.000Z';_x000D_
console.log(new Date(d).valueOf()); // returns the number of milliseconds since the epoch

_x000D_

How to view the SQL queries issued by JPA?

In EclipseLink to get the SQL for a specific Query at runtime you can use the DatabaseQuery API:

Query query = em.createNamedQuery("findMe"); 
Session session = em.unwrap(JpaEntityManager.class).getActiveSession(); 
DatabaseQuery databaseQuery = ((EJBQueryImpl)query).getDatabaseQuery(); 
databaseQuery.prepareCall(session, new DatabaseRecord());

String sqlString = databaseQuery.getSQLString();

This SQL will contain ? for parameters. To get the SQL translated with the arguments you need a DatabaseRecord with the parameter values.

DatabaseRecord recordWithValues= new DatabaseRecord();
recordWithValues.add(new DatabaseField("param1"), "someValue");

String sqlStringWithArgs = 
         databaseQuery.getTranslatedSQLString(session, recordWithValues);

Source: How to get the SQL for a Query

Get the decimal part from a double

var result = number.ToString().Split(System.Globalization.NumberDecimalSeparator)[2]

Returns it as a string (but you can always cast that back to an int), and assumes the number does have a "." somewhere.

Add a list item through javascript

Try something like this:

var node=document.createElement("LI");
var textnode=document.createTextNode(firstname);
node.appendChild(textnode);
document.getElementById("demo").appendChild(node);

Fiddle: http://jsfiddle.net/FlameTrap/3jDZd/

c++ array - expression must have a constant value

When creating an array like that, its size must be constant. If you want a dynamically sized array, you need to allocate memory for it on the heap and you'll also need to free it with delete when you're done:

//allocate the array
int** arr = new int*[row];
for(int i = 0; i < row; i++)
    arr[i] = new int[col];

// use the array

//deallocate the array
for(int i = 0; i < row; i++)
    delete[] arr[i];
delete[] arr;

If you want a fixed size, then they must be declared const:

const int row = 8;
const int col = 8;
int arr[row][col];

Also,

int [row][col];

doesn't even provide a variable name.

How to disable Google Chrome auto update?

I use Commodo Firewall HIPS feature to stop googleupdate.exe even executing. I have set no rules for gooleupdate.exe internet access but if somehow it does get to execute I will get a popup asking if I want to grant it internet access.

Currently trying to bring myself to move away from chrome and as many google products as possible after realising the effort they have gone to, to thwart the tiny minority of people who actually regedited the old auto update and their desire to have more control over your machines than you do.

Cannot run emulator in Android Studio

In my case (Windows 10) the reason was that I dared to unzip the android sdk into non default folder. When I moved it to the default one c:/Users/[username]/AppData/Local/Android/Sdk and changed the paths in Android Studio and System Variables, it started to work.

Java: How can I compile an entire directory structure of code ?

If all you want to do is run your main class (without compiling the .java files on which the main class doesn't depend), then you can do the following:

cd <root-package-directory>
javac <complete-path-to-main-class>

javac -cp <root-package-directory> <complete-path-to-main-class>

javac would automatically resolve all the dependencies and compile all the dependencies as well.

How to add new activity to existing project in Android Studio?

I think natually do it is straightforward, whether Intellij IDEA or Android Studio, I always click new Java class menu, and then typing the class name, press Enter to create. after that, I manually typing "extends Activity" in the class file, and then import the class by shortcut key. finally, I also manually override the onCreate() method and invoke the setContentView() method.

.c vs .cc vs. .cpp vs .hpp vs .h vs .cxx

It really doesn't matter.
If you feed .c to a c++ compiler it will compile as cpp, .cc/.cxx is just an alternative to .cpp used by some compilers.

.hpp is an attempt to distinguish header files where there are significant c and c++ differences. A common usage is for the .hpp to have the necessary cpp wrappers or namespace and then include the .h in order to expose a c library to both c and c++.

get list of packages installed in Anaconda

in terminal, type : conda list to obtain the packages installed using conda.

for the packages that pip recognizes, type : pip list

There may be some overlap of these lists as pip may recognize packages installed by conda (but maybe not the other way around, IDK).

There is a useful source here, including how to update or upgrade packages..

Issue with virtualenv - cannot activate

If you are using windows, just run .\Scripts\activate. Mind that the backslash plays the trick!

How to Convert Datetime to Date in dd/MM/yyyy format

Give a different alias

SELECT  Convert(varchar,A.InsertDate,103) as converted_Tran_Date from table as A
order by A.InsertDate

Python to print out status bar and percentage

I came upon this thread today and after having tried out this solution from Mark Rushakoff

from time import sleep
import sys

for i in range(21):
sys.stdout.write('\r')
# the exact output you're looking for:
sys.stdout.write("[%-20s] %d%%" % ('='*i, 5*i))
sys.stdout.flush()
sleep(0.25)

I can say that this works fine on W7-64 with python 3.4.3 64-bit but only in the native console. However when using the built-in console of spyder 3.0.0dev, the line breaks are still/again present. As this took me some time to figure out, I'd like to report this observation here.

Replace invalid values with None in Pandas DataFrame

Before proceeding with this post, it is important to understand the difference between NaN and None. One is a float type, the other is an object type. Pandas is better suited to working with scalar types as many methods on these types can be vectorised. Pandas does try to handle None and NaN consistently, but NumPy cannot.

My suggestion (and Andy's) is to stick with NaN.

But to answer your question...

pandas >= 0.18: Use `na_values=['-']` argument with `read_csv`

If you loaded this data from CSV/Excel, I have good news for you. You can quash this at the root during data loading instead of having to write a fix with code as a subsequent step.

Most of the pd.read_* functions (such as read_csv and read_excel) accept a na_values attribute.

file.csv

A,B
-,1
3,-
2,-
5,3
1,-2
-5,4
-1,-1
-,0
9,0

Now, to convert the - characters into NaNs, do,

import pandas as pd
df = pd.read_csv('file.csv', na_values=['-'])
df

     A    B
0  NaN  1.0
1  3.0  NaN
2  2.0  NaN
3  5.0  3.0
4  1.0 -2.0
5 -5.0  4.0
6 -1.0 -1.0
7  NaN  0.0
8  9.0  0.0

And similar for other functions/file formats.

P.S.: On v0.24+, you can preserve integer type even if your column has NaNs (yes, talk about having the cake and eating it too). You can specify dtype='Int32'

df = pd.read_csv('file.csv', na_values=['-'], dtype='Int32')
df

     A    B
0  NaN    1
1    3  NaN
2    2  NaN
3    5    3
4    1   -2
5   -5    4
6   -1   -1
7  NaN    0
8    9    0

df.dtypes

A    Int32
B    Int32
dtype: object

The dtype is not a conventional int type... but rather, a Nullable Integer Type. There are other options.

Handling Numeric Data: `pd.to_numeric` with `errors='coerce`

If you're dealing with numeric data, a faster solution is to use pd.to_numeric with the errors='coerce' argument, which coerces invalid values (values that cannot be cast to numeric) to NaN.

pd.to_numeric(df['A'], errors='coerce')

0    NaN
1    3.0
2    2.0
3    5.0
4    1.0
5   -5.0
6   -1.0
7    NaN
8    9.0
Name: A, dtype: float64

To retain (nullable) integer dtype, use

pd.to_numeric(df['A'], errors='coerce').astype('Int32')

0    NaN
1      3
2      2
3      5
4      1
5     -5
6     -1
7    NaN
8      9
Name: A, dtype: Int32

To coerce multiple columns, use apply:

df[['A', 'B']].apply(pd.to_numeric, errors='coerce').astype('Int32')

     A    B
0  NaN    1
1    3  NaN
2    2  NaN
3    5    3
4    1   -2
5   -5    4
6   -1   -1
7  NaN    0
8    9    0

...and assign the result back after.

More information can be found in this answer.

How do I create an HTML table with a fixed/frozen left column and a scrollable body?

No need to add any plugin, CSS can do this job !!!

The idea is to make the position of all the first cells in each column absolute, and make width fixed. Ex:

max-width: 125px;
min-width: 125px;
position: absolute;

This hides some parts of some columns under the first column, so add an empty second column (add second empty td) with width same as the first column.

I tested and this works in Chrome and Firefox.

What does 'COLLATE SQL_Latin1_General_CP1_CI_AS' do?

Please be aware that the accepted answer is a bit incomplete. Yes, at the most basic level Collation handles sorting. BUT, the comparison rules defined by the chosen Collation are used in many places outside of user queries against user data.

If "What does `COLLATE SQL_Latin1_General_CP1_CI_AS` do?" means "What does the `COLLATE` clause of `CREATE DATABASE` do?", then:

The COLLATE {collation_name} clause of the CREATE DATABASE statement specifies the default Collation of the Database, and not the Server; Database-level and Server-level default Collations control different things.

Server (i.e. Instance)-level controls:

Database-level Collation for system Databases: master, model, msdb, and tempdb.
Due to controlling the DB-level Collation of tempdb, it is then the default Collation for string columns in temporary tables (global and local), but not table variables.
Due to controlling the DB-level Collation of master, it is then the Collation used for Server-level data, such as Database names (i.e. name column in sys.databases), Login names, etc.
Handling of parameter / variable names
Handling of cursor names
Handling of GOTO labels
Default Collation used for newly created Databases when the COLLATE clause is missing

Database-level controls:

Default Collation used for newly created string columns (CHAR, VARCHAR, NCHAR, NVARCHAR, TEXT, and NTEXT -- but don't use TEXT or NTEXT) when the COLLATE clause is missing from the column definition. This goes for both CREATE TABLE and ALTER TABLE ... ADD statements.
Default Collation used for string literals (i.e. 'some text') and string variables (i.e. @StringVariable). This Collation is only ever used when comparing strings and variables to other strings and variables. When comparing strings / variables to columns, then the Collation of the column will be used.
The Collation used for Database-level meta-data, such as object names (i.e. sys.objects), column names (i.e. sys.columns), index names (i.e. sys.indexes), etc.
The Collation used for Database-level objects: tables, columns, indexes, etc.

Also:

ASCII is an encoding which is 8-bit (for common usage; technically "ASCII" is 7-bit with character values 0 - 127, and "ASCII Extended" is 8-bit with character values 0 - 255). This group is the same across cultures.
The Code Page is the "extended" part of Extended ASCII, and controls which characters are used for values 128 - 255. This group varies between each culture.
Latin1 does not mean "ASCII" since standard ASCII only covers values 0 - 127, and all code pages (that can be represented in SQL Server, and even NVARCHAR) map those same 128 values to the same characters.

If "What does `COLLATE SQL_Latin1_General_CP1_CI_AS` do?" means "What does this particular collation do?", then:

Because the name start with SQL_, this is a SQL Server collation, not a Windows collation. These are definitely obsolete, even if not officially deprecated, and are mainly for pre-SQL Server 2000 compatibility. Although, quite unfortunately SQL_Latin1_General_CP1_CI_AS is very common due to it being the default when installing on an OS using US English as its language. These collations should be avoided if at all possible.

Windows collations (those with names not starting with SQL_) are newer, more functional, have consistent sorting between VARCHAR and NVARCHAR for the same values, and are being updated with additional / corrected sort weights and uppercase/lowercase mappings. These collations also don't have the potential performance problem that the SQL Server collations have: Impact on Indexes When Mixing VARCHAR and NVARCHAR Types.
Latin1_General is the culture / locale.
- For NCHAR, NVARCHAR, and NTEXT data this determines the linguistic rules used for sorting and comparison.
- For CHAR, VARCHAR, and TEXT data (columns, literals, and variables) this determines the:
  - linguistic rules used for sorting and comparison.
  - code page used to encode the characters. For example, Latin1_General collations use code page 1252, Hebrew collations use code page 1255, and so on.
CP{code_page} or {version}
- For SQL Server collations: CP{code_page}, is the 8-bit code page that determines what characters map to values 128 - 255. While there are four code pages for Double-Byte Character Sets (DBCS) that can use 2-byte combinations to create more than 256 characters, these are not available for the SQL Server collations.
- For Windows collations: {version}, while not present in all collation names, refers to the SQL Server version in which the collation was introduced (for the most part). Windows collations with no version number in the name are version 80 (meaning SQL Server 2000 as that is version 8.0). Not all versions of SQL Server come with new collations, so there are gaps in the version numbers. There are some that are 90 (for SQL Server 2005, which is version 9.0), most are 100 (for SQL Server 2008, version 10.0), and a small set has 140 (for SQL Server 2017, version 14.0).
  
  I said "for the most part" because the collations ending in _SC were introduced in SQL Server 2012 (version 11.0), but the underlying data wasn't new, they merely added support for supplementary characters for the built-in functions. So, those endings exist for version 90 and 100 collations, but only starting in SQL Server 2012.
Next you have the sensitivities, that can be in any combination of the following, but always specified in this order:
- CS = case-sensitive or CI = case-insensitive
- AS = accent-sensitive or AI = accent-insensitive
- KS = Kana type-sensitive or missing = Kana type-insensitive
- WS = width-sensitive or missing = width insensitive
- VSS = variation selector sensitive (only available in the version 140 collations) or missing = variation selector insensitive
Optional last piece:
- _SC at the end means "Supplementary Character support". The "support" only affects how the built-in functions interpret surrogate pairs (which are how supplementary characters are encoded in UTF-16). Without _SC at the end (or _140_ in the middle), built-in functions don't see a single supplementary character, but instead see two meaningless code points that make up the surrogate pair. This ending can be added to any non-binary, version 90 or 100 collation.
- _BIN or _BIN2 at the end means "binary" sorting and comparison. Data is still stored the same, but there are no linguistic rules. This ending is never combined with any of the 5 sensitivities or _SC. _BIN is the older style, and _BIN2 is the newer, more accurate style. If using SQL Server 2005 or newer, use _BIN2. For details on the differences between _BIN and _BIN2, please see: Differences Between the Various Binary Collations (Cultures, Versions, and BIN vs BIN2).
- _UTF8 is a new option as of SQL Server 2019. It's an 8-bit encoding that allows for Unicode data to be stored in VARCHAR and CHAR datatypes (but not the deprecated TEXT datatype). This option can only be used on collations that support supplementary characters (i.e. version 90 or 100 collations with _SC in their name, and version 140 collations). There is also a single binary _UTF8 collation (_BIN2, not _BIN).
  
  PLEASE NOTE: UTF-8 was designed / created for compatibility with environments / code that are set up for 8-bit encodings yet want to support Unicode. Even though there are a few scenarios where UTF-8 can provide up to 50% space savings as compared to NVARCHAR, that is a side-effect and has a cost of a slight hit to performance in many / most operations. If you need this for compatibility, then the cost is acceptable. If you want this for space-savings, you had better test, and TEST AGAIN. Testing includes all functionality, and more than just a few rows of data. Be warned that UTF-8 collations work best when ALL columns, and the database itself, are using VARCHAR data (columns, variables, string literals) with a _UTF8 collation. This is the natural state for anyone using this for compatibility, but not for those hoping to use it for space-savings. Be careful when mixing VARCHAR data using a _UTF8 collation with either VARCHAR data using non-_UTF8 collations or NVARCHAR data, as you might experience odd behavior / data loss. For more details on the new UTF-8 collations, please see: Native UTF-8 Support in SQL Server 2019: Savior or False Prophet?

Do I need to close() both FileReader and BufferedReader?

You Only Need to close the bufferedReader i.e reader.close() and it will work fine .

Is null check needed before calling instanceof?

No, a null check is not needed before using instanceof.

The expression x instanceof SomeClass is false if x is null.

From the Java Language Specification, section 15.20.2, "Type comparison operator instanceof":

"At run time, the result of the instanceof operator is true if the value of the RelationalExpression is not null and the reference could be cast to the ReferenceType without raising a ClassCastException. Otherwise the result is false."

So if the operand is null, the result is false.

Regular expression to validate US phone numbers?

The easiest way to match both

^\([0-9]{3}\)[0-9]{3}-[0-9]{4}$

and

^[0-9]{3}-[0-9]{3}-[0-9]{4}$

is to use alternation ((...|...)): specify them as two mostly-separate options:

^(\([0-9]{3}\)|[0-9]{3}-)[0-9]{3}-[0-9]{4}$

By the way, when Americans put the area code in parentheses, we actually put a space after that; for example, I'd write (123) 123-1234, not (123)123-1234. So you might want to write:

^(\([0-9]{3}\) |[0-9]{3}-)[0-9]{3}-[0-9]{4}$

(Though it's probably best to explicitly demonstrate the format that you expect phone numbers to be in.)

Calling C/C++ from Python?

You should have a look at Boost.Python. Here is the short introduction taken from their website:

The Boost Python Library is a framework for interfacing Python and C++. It allows you to quickly and seamlessly expose C++ classes functions and objects to Python, and vice-versa, using no special tools -- just your C++ compiler. It is designed to wrap C++ interfaces non-intrusively, so that you should not have to change the C++ code at all in order to wrap it, making Boost.Python ideal for exposing 3rd-party libraries to Python. The library's use of advanced metaprogramming techniques simplifies its syntax for users, so that wrapping code takes on the look of a kind of declarative interface definition language (IDL).

urllib2.HTTPError: HTTP Error 403: Forbidden

This will work in Python 3

import urllib.request

user_agent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.7) Gecko/2009021910 Firefox/3.0.7'

url = "http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers"
headers={'User-Agent':user_agent,} 

request=urllib.request.Request(url,None,headers) #The assembled request
response = urllib.request.urlopen(request)
data = response.read() # The data u need

adding line break

The correct answer is to use Environment.NewLine, as you've noted. It is environment specific and provides clarity over "\r\n" (but in reality makes no difference).

foreach (var item in FirmNameList) 
{
    if (FirmNames != "")
    {
        FirmNames += ", " + Environment.NewLine;
    }
    FirmNames += item; 
}

How to add new line in Markdown presentation?

It depends on what kind of markdown parser you're using. For example in showdownjs there is an option {simpleLineBreaks: true} which gives corresponding html for the following md input:

a line
wrapped in two

<p>a line<br>
wrapped in two</p>

How to access JSON decoded array in PHP

As you're passing true as the second parameter to json_decode, in the above example you can retrieve data doing something similar to:

<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

var_dump(json_decode($json));
var_dump(json_decode($json, true));

?>

Set Page Title using PHP

The problem is that $title is being referenced on line 5 before it's being assigned on line 58. Rearranging your code isn't easy, because the data is both retrieved and output at the same time. Just to test, how does something like this work?

Because you're only retrieving one row, you don't need to use a while loop, but I left it with hopes that it'll make it easier for you to relate to your current code. All I've done is removed the actual output from your data retrieval, and added variables for category and category name which are then referred to as usual later on. Also, I haven't tested this. :)

How to truncate text in Angular2?

I've been using this module ng2 truncate, its pretty easy, import module and u are ready to go... in {{ data.title | truncate : 20 }}

JQuery create a form and add elements to it programmatically

The 2nd line should be written as:

$form.append('<input type="button" value="button">');

Add element to a list In Scala

I will try to explain the results of all the commands you tried.

scala> val l = 1.0 :: 5.5 :: Nil
l: List[Double] = List(1.0, 5.5)

First of all, List is a type alias to scala.collection.immutable.List (defined in Predef.scala).

Using the List companion object is more straightforward way to instantiate a List. Ex: List(1.0,5.5)

scala> l
res0: List[Double] = List(1.0, 5.5)

scala> l ::: List(2.2, 3.7)
res1: List[Double] = List(1.0, 5.5, 2.2, 3.7)

::: returns a list resulting from the concatenation of the given list prefix and this list

The original List is NOT modified

scala> List(l) :+ 2.2
res2: List[Any] = List(List(1.0, 5.5), 2.2)

List(l) is a List[List[Double]] Definitely not what you want.

:+ returns a new list consisting of all elements of this list followed by elem.

The type is List[Any] because it is the common superclass between List[Double] and Double

scala> l
res3: List[Double] = List(1.0, 5.5)

l is left unmodified because no method on immutable.List modified the List.

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

You have to change the ID of the button to be different from the function name JSFiddle

_x000D_

var counter = 0;_x000D_
_x000D_
_x000D_
function moreFields() {_x000D_
  counter++;_x000D_
  var newFields = document.getElementById('readroot').cloneNode(true);_x000D_
  newFields.id = '';_x000D_
  newFields.style.display = 'block';_x000D_
  var newField = newFields.childNodes;_x000D_
  for (var i = 0; i < newField.length; i++) {_x000D_
    var theName = newField[i].name_x000D_
    if (theName) newField[i].name = theName + counter;_x000D_
  }_x000D_
  var insertHere = document.getElementById('writeroot');_x000D_
  insertHere.parentNode.insertBefore(newFields, insertHere);_x000D_
}_x000D_
_x000D_
window.onload = moreFields();

_x000D_

<div id="readroot" style="display: none">_x000D_
  <input type="button" value="Remove review" onclick="this.parentNode.parentNode.removeChild(this.parentNode);" />_x000D_
  <br />_x000D_
  <br />_x000D_
  <input name="cd" value="title" />_x000D_
  <select name="rankingsel">_x000D_
    <option>Rating</option>_x000D_
    <option value="excellent">Excellent</option>_x000D_
    <option value="good">Good</option>_x000D_
    <option value="ok">OK</option>_x000D_
    <option value="poor">Poor</option>_x000D_
    <option value="bad">Bad</option>_x000D_
  </select>_x000D_
  <br />_x000D_
  <br />_x000D_
  <textarea rows="5" cols="20" name="review">Short review</textarea>_x000D_
  <br />Radio buttons included to test them in Explorer:_x000D_
  <br />_x000D_
  <input type="radio" name="something" value="test1" />Test 1_x000D_
  <br />_x000D_
  <input type="radio" name="something" value="test2" />Test 2</div>_x000D_
<form method="post" action="index1.php"> <span id="writeroot"></span>_x000D_
_x000D_
  <input type="button" onclick="moreFields();" id="moreFieldsButton" value="Give me more fields!" />_x000D_
  <input type="submit" value="Send form" />_x000D_
</form>

_x000D_

z-index not working with fixed positioning

When elements are positioned outside the normal flow, they can overlap other elements.

according to Overlapping Elements section on http://web.archive.org/web/20130501103219/http://w3schools.com/css/css_positioning.asp

Change File Extension Using C#

You should do a move of the file to rename it. In your example code you are only changing the string, not the file:

myfile= "c:/my documents/my images/cars/a.jpg";
string extension = Path.GetExtension(myffile); 
myfile.replace(extension,".Jpeg");

you are only changing myfile (which is a string). To move the actual file, you should do

FileInfo f = new FileInfo(myfile);
f.MoveTo(Path.ChangeExtension(myfile, ".Jpeg"));

See FileInfo.MoveTo

Cannot connect to SQL Server named instance from another SQL Server

I've finally found the issue here. Even though the firewall was turned off at both the locations we found that a router in the SQLB data center was actively blocking UDP 1434. I was able to determine this by installing the PorQry tool by Microsoft (http://www.microsoft.com/en-ca/download/details.aspx?id=17148) and running a query against the UDP port. Then I installed WireShark (http://www.wireshark.org/) to view the actual connection details and found the router in question that was refusing to forward the request. Since this router only affected SQLB this explains why every other connection worked fine.

Thanks everyone for your suggestions and assistance!

Regex pattern for checking if a string starts with a certain substring?

I really recommend using the String.StartsWith method over the Regex.IsMatch if you only plan to check the beginning of a string.

Firstly, the regular expression in C# is a language in a language with does not help understanding and code maintenance. Regular expression is a kind of DSL.
Secondly, many developers does not understand regular expressions: it is something which is not understandable for many humans.
Thirdly, the StartsWith method brings you features to enable culture dependant comparison which regular expressions are not aware of.

In your case you should use regular expressions only if you plan implementing more complex string comparison in the future.

Git copy file preserving history

Unlike subversion, git does not have a per-file history. If you look at the commit data structure, it only points to the previous commits and the new tree object for this commit. No explicit information is stored in the commit object which files are changed by the commit; nor the nature of these changes.

The tools to inspect changes can detect renames based on heuristics. E.g. "git diff" has the option -M that turns on rename detection. So in case of a rename, "git diff" might show you that one file has been deleted and another one created, while "git diff -M" will actually detect the move and display the change accordingly (see "man git diff" for details).

So in git this is not a matter of how you commit your changes but how you look at the committed changes later.

How to correctly link php-fpm and Nginx Docker containers?

Don't hardcode ip of containers in nginx config, docker link adds the hostname of the linked machine to the hosts file of the container and you should be able to ping by hostname.

EDIT: Docker 1.9 Networking no longer requires you to link containers, when multiple containers are connected to the same network, their hosts file will be updated so they can reach each other by hostname.

Every time a docker container spins up from an image (even stop/start-ing an existing container) the containers get new ip's assigned by the docker host. These ip's are not in the same subnet as your actual machines.

see docker linking docs (this is what compose uses in the background)

but more clearly explained in the docker-compose docs on links & expose

links
links:
 - db
 - db:database
 - redis
An entry with the alias' name will be created in /etc/hosts inside containers for this service, e.g:
172.17.2.186  db
172.17.2.186  database
172.17.2.187  redis
expose

Expose ports without publishing them to the host machine - they'll only be accessible to linked services. Only the internal port can be specified.

and if you set up your project to get the ports + other credentials through environment variables, links automatically set a bunch of system variables:

To see what environment variables are available to a service, run docker-compose run SERVICE env.

name_PORT

Full URL, e.g. DB_PORT=tcp://172.17.0.5:5432

name_PORT_num_protocol

Full URL, e.g. DB_PORT_5432_TCP=tcp://172.17.0.5:5432

name_PORT_num_protocol_ADDR

Container's IP address, e.g. DB_PORT_5432_TCP_ADDR=172.17.0.5

name_PORT_num_protocol_PORT

Exposed port number, e.g. DB_PORT_5432_TCP_PORT=5432

name_PORT_num_protocol_PROTO

Protocol (tcp or udp), e.g. DB_PORT_5432_TCP_PROTO=tcp

name_NAME

Fully qualified container name, e.g. DB_1_NAME=/myapp_web_1/myapp_db_1

How to delete all files and folders in a folder by cmd call

Navigate to the parent directory

Line1 pushd "Parent Directory"

Delete the sub folders

Line2 rd /s /q . 2>nul

https://superuser.com/questions/173859/how-can-i-delete-all-files-subfolders-in-a-given-folder-via-the-command-prompt

C# delete a folder and all files and folders within that folder

Try this.

namespace EraseJunkFiles
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo yourRootDir = new DirectoryInfo(@"C:\somedirectory\");
            foreach (DirectoryInfo dir in yourRootDir.GetDirectories())
                    DeleteDirectory(dir.FullName, true);
        }
        public static void DeleteDirectory(string directoryName, bool checkDirectiryExist)
        {
            if (Directory.Exists(directoryName))
                Directory.Delete(directoryName, true);
            else if (checkDirectiryExist)
                throw new SystemException("Directory you want to delete is not exist");
        }
    }
}

ValueError: max() arg is an empty sequence

in one line,

v = max(v) if v else None

>>> v = []
>>> max(v)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: max() arg is an empty sequence
>>> v = max(v) if v else None
>>> v
>>>

TypeLoadException says 'no implementation', but it is implemented

I also ran into this problem while running my unittests. The application ran fine and with no errors. The cause of the problem in my case was that I had turned off the building of the test projects. Reenabling the building of my testprojects solved the issues.

How to give color to each class in scatter plot in R?

If you have the classes separated in a data frame or a matrix, then you can use matplot. For example, if we have

dat<-as.data.frame(cbind(c(1,2,5,7),c(2.1,4.2,-0.5,1),c(9,3,6,2.718)))

plot.new()
plot.window(c(0,nrow(dat)),range(dat))
matplot(dat,col=c("red","blue","yellow"),pch=20)

Then you'll get a scatterplot where the first column of dat is plotted in red, the second in blue, and the third in yellow. Of course, if you want separate x and y values for your color classes, then you can have datx and daty, etc.

An alternate approach would be to tack on an extra column specifying what color you want (or keeping an extra vector of colors, filling it iteratively with a for loop and some if branches). For example, this will get you the same plot:

dat<-as.data.frame(
    cbind(c(1,2,5,7,2.1,4.2,-0.5,1,9,3,6,2.718)
    ,c(rep("red",4),rep("blue",4),rep("yellow",4))))

dat[,1]=as.numeric(dat[,1]) #This is necessary because
                            #the second column consisting of strings confuses R
                            #into thinking that the first column must consist of strings, too
plot(dat[,1],pch=20,col=dat[,2])

How to draw polygons on an HTML5 canvas?

For the people looking for regular polygons:

function regPolyPath(r,p,ctx){ //Radius, #points, context
  //Azurethi was here!
  ctx.moveTo(r,0);
  for(i=0; i<p+1; i++){
    ctx.rotate(2*Math.PI/p);
    ctx.lineTo(r,0);
  }
  ctx.rotate(-2*Math.PI/p);
}

Use:

//Get canvas Context
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");

ctx.translate(60,60);    //Moves the origin to what is currently 60,60
//ctx.rotate(Rotation);  //Use this if you want the whole polygon rotated
regPolyPath(40,6,ctx);   //Hexagon with radius 40
//ctx.rotate(-Rotation); //remember to 'un-rotate' (or save and restore)
ctx.stroke();

Javascript - How to extract filename from a file input control

Input: C:\path\Filename.ext
Output: Filename

In HTML code, set the File onChange value like this...

<input type="file" name="formdata" id="formdata" onchange="setfilename(this.value)"/>

Assuming your textfield id is 'wpName'...

<input type="text" name="wpName" id="wpName">

JavaScript

<script>
  function setfilename(val)
  {
    filename = val.split('\\').pop().split('/').pop();
    filename = filename.substring(0, filename.lastIndexOf('.'));
    document.getElementById('wpName').value = filename;
  }
</script>

Multiple lines of text in UILabel

myUILabel.numberOfLines = 0;
myUILabel.text = @"your long string here";
[myUILabel sizeToFit];

In DB2 Display a table's definition

All that metadata is held in the DB2 catalog tables in the SYSIBM 'schema'. It varies for the DB2/z mainframe product and the DB2/LUW distributed product but they're coming closer and closer with each release.

IBM conveniently place all their manuals up on the publib site for the world to access. My area of expertise, DB2/z, has the pages you want here.

There are a number of tables there that you'll need to reference:

SYSTABLES        for table information.
SYSINDEXES    \
SYSINDEXPART   + for index information.
SYSKEYS       /
SYSCOLUMNS       for column information.

The list of all information centers is here which should point you to the DB2/LUW version if that's your area of interest.

Fatal error: Call to undefined function imap_open() in PHP

I had the same issue. After changing a semicolon in the php.ini file I solved my problem. Let's see how can you solve it?

First, open php.ini file. xampp/php/php.ini

Search extension=imap

remove semicolon before extension and save this file.

Code before remove semicolon ;extension=imap

Code after remove semicolon extension=imap

Finally, open the XAMPP Control panel and restart Apache.

Xamarin 2.0 vs Appcelerator Titanium vs PhoneGap

I have worked with Xamarin. Here are the positives and negatives I have found:

Positives

Easy to code, C# makes the job easier
Performance won't be a concern
Native UI
Good IDE, much like Xcode and Visual Studio.
Xamarin Debugger
Xamarin SDK is free and open-source. Wiki

Negatives

You need to know the API for each platform you want to target (iOS, Android, WP8). However, you do not need to know Objective-C or Java.
Xamarin shares only a few things across platforms (things like databases and web services).
You have to design the UI of each platform separately (this can be a blessing or a curse).

increment date by one month

function dayOfWeek($date){
    return DateTime::createFromFormat('Y-m-d', $date)->format('N');
}

Usage examples:

echo dayOfWeek(2016-12-22);
// "4"
echo dayOfWeek(date('Y-m-d'));
// "4"

Android - save/restore fragment state

In order to save the Fragment state you need to implement onSaveInstanceState(): "Also like an activity, you can retain the state of a fragment using a Bundle, in case the activity's process is killed and you need to restore the fragment state when the activity is recreated. You can save the state during the fragment's onSaveInstanceState() callback and restore it during either onCreate(), onCreateView(), or onActivityCreated(). For more information about saving state, see the Activities document."

http://developer.android.com/guide/components/fragments.html#Lifecycle

Days between two dates?

Referencing my comments on other answers. This is how I would work out the difference in days based on 24 hours and calender days. the days attribute works well for 24 hours and the function works best for calendar checks.

from datetime import timedelta, datetime

def cal_days_diff(a,b):

    A = a.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
    B = b.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
    return (A - B).days

if __name__ == '__main__':

    x = datetime(2013, 06, 18, 16, 00)
    y = datetime(2013, 06, 19, 2, 00)

    print (y - x).days          # 0
    print cal_days_diff(y, x)   # 1 

    z = datetime(2013, 06, 20, 2, 00)

    print (z - x).days          # 1
    print cal_days_diff(z, x)   # 2

Anaconda / Python: Change Anaconda Prompt User Path

In Windows, if you have the shortcut in your taskbar, right-click the "Anaconda Prompt" icon, you'll see:

Anaconda Prompt
Unpin from taskbar (if pinned)
Close window

Right-click on "Anaconda Prompt" again.

Click "Properties"

Add the path you want your anaconda prompt to open up into in the "Start In:" section.

Note - you can also do this by searching for "Anaconda Prompt" in the Start Menu. The directions above are specifically for the shortcut.

How to preSelect an html dropdown list with php?

I have 2 php files and i made this, and it works. (this is an example) the first code is from the one file and the second code from two file.

<form action="two.php" method="post">
<input type="submit" class="button" value="submit" name="one"/>
<select name="numbers">
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
</select>
</form>



if(isset ($_POST['one']))
{

if($_POST['numbers']=='1')
{
$a='1' ;
}
else if($_POST['numbers']=='2')
{
$a='2' ;
{
else if ($_POST['numbers']=='3')
{
$a='3' ;
}

}

File Upload with Angular Material

You can change the style by wrapping the input inside a label and change the input display to none. Then, you can specify the text you want to be displayed inside a span element. Note: here I used bootstrap 4 button style (btn btn-outline-primary). You can use any style you want.

<label class="btn btn-outline-primary">
      <span>Select File</span>
      <input type="file">
</label>

input {
  display: none;
}

How to get a List<string> collection of values from app.config in WPF?

There's actually a very little known class in the BCL for this purpose exactly: CommaDelimitedStringCollectionConverter. It serves as a middle ground of sorts between having a ConfigurationElementCollection (as in Richard's answer) and parsing the string yourself (as in Adam's answer).

For example, you could write the following configuration section:

public class MySection : ConfigurationSection
{
    [ConfigurationProperty("MyStrings")]
    [TypeConverter(typeof(CommaDelimitedStringCollectionConverter))]
    public CommaDelimitedStringCollection MyStrings
    {
        get { return (CommaDelimitedStringCollection)base["MyStrings"]; }
    }
}

You could then have an app.config that looks like this:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="foo" type="ConsoleApplication1.MySection, ConsoleApplication1"/>
  </configSections>
  <foo MyStrings="a,b,c,hello,world"/>
</configuration>

Finally, your code would look like this:

var section = (MySection)ConfigurationManager.GetSection("foo");
foreach (var s in section.MyStrings)
    Console.WriteLine(s); //for example

C error: Expected expression before int

This is actually a fairly interesting question. It's not as simple as it looks at first. For reference, I'm going to be basing this off of the latest C11 language grammar defined in N1570

I guess the counter-intuitive part of the question is: if this is correct C:

if (a == 1) {
  int b = 10;
}

then why is this not also correct C?

if (a == 1)
  int b = 10;

I mean, a one-line conditional if statement should be fine either with or without braces, right?

The answer lies in the grammar of the if statement, as defined by the C standard. The relevant parts of the grammar I've quoted below. Succinctly: the int b = 10 line is a declaration, not a statement, and the grammar for the if statement requires a statement after the conditional that it's testing. But if you enclose the declaration in braces, it becomes a statement and everything's well.

And just for the sake of answering the question completely -- this has nothing to do with scope. The b variable that exists inside that scope will be inaccessible from outside of it, but the program is still syntactically correct. Strictly speaking, the compiler shouldn't throw an error on it. Of course, you should be building with -Wall -Werror anyways ;-)

(6.7) declaration:
            declaration-speci?ers init-declarator-list_opt ;
            static_assert-declaration

(6.7) init-declarator-list:
            init-declarator
            init-declarator-list , init-declarator

(6.7) init-declarator:
            declarator
            declarator = initializer

(6.8) statement:
            labeled-statement
            compound-statement
            expression-statement
            selection-statement
            iteration-statement
            jump-statement

(6.8.2) compound-statement:
            { block-item-list_opt }

(6.8.4) selection-statement:
            if ( expression ) statement
            if ( expression ) statement else statement
            switch ( expression ) statement

Document Root PHP

<a href="<?php echo $_SERVER['DOCUMENT_ROOT'].'/hello.html'; ?>">go with php</a>
    <br />
<a href="/hello.html">go to with html</a>

Try this yourself and find that they are not exactly the same.

$_SERVER['DOCUMENT_ROOT'] renders an actual file path (on my computer running as it's own server, C:/wamp/www/

HTML's / renders the root of the server url, in my case, localhost/

But C:/wamp/www/hello.html and localhost/hello.html are in fact the same file

What is the best way to generate a unique and short file name in Java

I'd use Apache Commons Lang library (http://commons.apache.org/lang).

There is a class org.apache.commons.lang.RandomStringUtils that can be used to generate random strings of given length. Very handy not only for filename generation!

Here is the example:

String ext = "dat";
File dir = new File("/home/pregzt");
String name = String.format("%s.%s", RandomStringUtils.randomAlphanumeric(8), ext);
File file = new File(dir, name);

How to $http Synchronous call with AngularJS

Here's a way you can do it asynchronously and manage things like you would normally. Everything is still shared. You get a reference to the object that you want updated. Whenever you update that in your service, it gets updated globally without having to watch or return a promise. This is really nice because you can update the underlying object from within the service without ever having to rebind. Using Angular the way it's meant to be used. I think it's probably a bad idea to make $http.get/post synchronous. You'll get a noticeable delay in the script.

app.factory('AssessmentSettingsService', ['$http', function($http) {
    //assessment is what I want to keep updating
    var settings = { assessment: null };

    return {
        getSettings: function () {
             //return settings so I can keep updating assessment and the
             //reference to settings will stay in tact
             return settings;
        },
        updateAssessment: function () {
            $http.get('/assessment/api/get/' + scan.assessmentId).success(function(response) {
                //I don't have to return a thing.  I just set the object.
                settings.assessment = response;
            });
        }
    };
}]);

    ...
        controller: ['$scope', '$http', 'AssessmentSettingsService', function ($scope, as) {
            $scope.settings = as.getSettings();
            //Look.  I can even update after I've already grabbed the object
            as.updateAssessment();

And somewhere in a view:

<h1>{{settings.assessment.title}}</h1>

How to enter quotes in a Java string?

suppose ROM is string variable which equals "strval" you can simply do

String value= " \" "+ROM+" \" ";

it will be stored as

value= " "strval" ";

The network path was not found

This is probably related to your database connection string or something like that.

I just solved this exception right now. What was happening is that I was using a connection string intended to be used when debugging in a different machine (the server).

I commented the wrong connection string in Web.config and uncommented the right one. Now I'm back in business... this is something I forget to look at after sometime not working in a given solution. ;)

ActionController::InvalidAuthenticityToken

I had this issue with javascript calls. I fixed that with just requiring jquery_ujs into application.js file.

How to check if ZooKeeper is running or up from command prompt?

Zookeeper is just a Java process and when you start a Zookeeper instance it runs a org.apache.zookeeper.server.quorum.QuorumPeerMain class. So you can check for a running Zookeeper like this:

jps -l | grep zookeeper

or even like this:

jps | grep Quorum

upd:

regarding this: will hostname be the hostname of my box?? - the answer is yes.

window.close and self.close do not close the window in Chrome

This might be old, but let's answer it.

I use top.close() to close a tab. window.close() or other open...close didn't work for me.

Adding a directory to the PATH environment variable in Windows

Checking the above suggestions on Windows 10 LTSB, and with a glimpse on the "help" outlines (that can be viewed when typing 'command /?' on the cmd), brought me to the conclusion that the PATH command changes the system environment variable Path values only for the current session, but after reboot all the values reset to their default- just as they were prior to using the PATH command.

On the other hand using the SETX command with administrative privileges is way more powerful. It changes those values for good (or at least until the next time this command is used or until next time those values are manually GUI manipulated... ).

The best SETX syntax usage that worked for me:

SETX PATH "%PATH%;C:\path\to\where\the\command\resides"

where any equal sign '=' should be avoided, and don't you worry about spaces! There isn't any need to insert any more quotation marks for a path that contains spaces inside it - the split sign ';' does the job.

The PATH keyword that follows the SETX defines which set of values should be changed among the System Environment Variables possible values, and the %PATH% (the word PATH surrounded by the percent sign) inside the quotation marks, tells the OS to leave the existing PATH values as they are and add the following path (the one that follows the split sign ';') to the existing values.

How to get everything after last slash in a URL?

One more (idio(ma)tic) way:

URL.split("/")[-1]

How do you change the document font in LaTeX?

For a different approach, I would suggest using the XeTeX or LuaTex system. They allow you to access system fonts (TrueType, OpenType, etc) and set font features. In a typical LaTeX document, you just need to include this in your headers:

\usepackage{fontspec}
\defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
\setmainfont{Times}
\setmonofont{Lucida Sans Typewriter}

It's the fontspec package that allows for \setmainfont and \setmonofont. The ability to choose a multitude of font features is beyond my expertise, but I would suggest looking up some examples and seeing if this would suit your needs.

Just don't forget to replace your favorite latex compiler by the appropriate one (xelatex or lualatex).

codes for ADD,EDIT,DELETE,SEARCH in vb2010

Have you googled about it - insert update delete access vb.net, there are lots of reference about this.

Insert Update Delete Navigation & Searching In Access Database Using VB.NET

Create Visual Basic 2010 Project: VB-Access
Assume that, we have a database file named data.mdb
Place the data.mdb file into ..\bin\Debug\ folder (Where the project executable file (.exe) is placed)

what could be the easier way to connect and manipulate the DB?
Use OleDBConnection class to make connection with DB

is it by using MS ACCESS 2003 or MS ACCESS 2007?
you can use any you want to use or your client will use on their machine.

it seems that you want to find some example of opereations fo the database. Here is an example of Access 2010 for your reference:

Example code snippet:

Imports System
Imports System.Data
Imports System.Data.OleDb

Public Class DBUtil

 Private connectionString As String

 Public Sub New()

  Dim con As New OleDb.OleDbConnection
  Dim dbProvider As String = "Provider=Microsoft.ace.oledb.12.0;"
  Dim dbSource = "Data Source=d:\DB\Database11.accdb"

  connectionString = dbProvider & dbSource

 End Sub

 Public Function GetCategories() As DataSet

  Dim query As String = "SELECT * FROM Categories"
  Dim cmd As New OleDbCommand(query)
  Return FillDataSet(cmd, "Categories")

 End Function

 Public SubUpdateCategories(ByVal name As String)
  Dim query As String = "update Categories set name = 'new2' where name = ?"
  Dim cmd As New OleDbCommand(query)
cmd.Parameters.AddWithValue("Name", name)
  Return FillDataSet(cmd, "Categories")

 End Sub

 Public Function GetItems() As DataSet

  Dim query As String = "SELECT * FROM Items"
  Dim cmd As New OleDbCommand(query)
  Return FillDataSet(cmd, "Items")

 End Function

 Public Function GetItems(ByVal categoryID As Integer) As DataSet

  'Create the command.
  Dim query As String = "SELECT * FROM Items WHERE Category_ID=?"
  Dim cmd As New OleDbCommand(query)
  cmd.Parameters.AddWithValue("category_ID", categoryID)

  'Fill the dataset.
  Return FillDataSet(cmd, "Items")

 End Function

 Public Sub AddCategory(ByVal name As String)

  Dim con As New OleDbConnection(connectionString)

  'Create the command.
  Dim insertSQL As String = "INSERT INTO Categories "
  insertSQL &= "VALUES(?)"
  Dim cmd As New OleDbCommand(insertSQL, con)
  cmd.Parameters.AddWithValue("Name", name)

  Try
   con.Open()
   cmd.ExecuteNonQuery()
  Finally
   con.Close()
  End Try

 End Sub

 Public Sub AddItem(ByVal title As String, ByVal description As String, _
    ByVal price As Decimal, ByVal categoryID As Integer)

  Dim con As New OleDbConnection(connectionString)

  'Create the command.
  Dim insertSQL As String = "INSERT INTO Items "
  insertSQL &= "(Title, Description, Price, Category_ID)"
  insertSQL &= "VALUES (?, ?, ?, ?)"
  Dim cmd As New OleDb.OleDbCommand(insertSQL, con)
  cmd.Parameters.AddWithValue("Title", title)
  cmd.Parameters.AddWithValue("Description", description)
  cmd.Parameters.AddWithValue("Price", price)
  cmd.Parameters.AddWithValue("CategoryID", categoryID)

  Try
   con.Open()
   cmd.ExecuteNonQuery()
  Finally
   con.Close()
  End Try

 End Sub

 Private Function FillDataSet(ByVal cmd As OleDbCommand, ByVal tableName As String) As DataSet

  Dim con As New OleDb.OleDbConnection
  Dim dbProvider As String = "Provider=Microsoft.ace.oledb.12.0;"
  Dim dbSource = "Data Source=D:\DB\Database11.accdb"

  connectionString = dbProvider & dbSource
  con.ConnectionString = connectionString
  cmd.Connection = con
  Dim adapter As New OleDbDataAdapter(cmd)
  Dim ds As New DataSet()

  Try
   con.Open()
   adapter.Fill(ds, tableName)
  Finally
   con.Close()
  End Try
  Return ds

 End Function

End Class

Refer these links:
Insert, Update, Delete & Search Values in MS Access 2003 with VB.NET 2005
INSERT, DELETE, UPDATE AND SELECT Data in MS-Access with VB 2008
How Add new record ,Update record,Delete Records using Vb.net Forms when Access as a back

Warning: Each child in an array or iterator should have a unique "key" prop. Check the render method of `ListView`

Seems like both the conditions are met, perhaps key('contact') is the issue

 if(store.telefon) {
    detailItems.push( new DetailItem('contact', store.telefon, 'Anrufen', 'fontawesome|phone') );
}
if(store.email) {
    detailItems.push( new DetailItem('contact', store.email, 'Email', 'fontawesome|envelope') );
}

The POM for project is missing, no dependency information available

Change:

<!-- ANT4X -->
<dependency>
  <groupId>net.sourceforge</groupId>
  <artifactId>ant4x</artifactId>
  <version>${net.sourceforge.ant4x-version}</version>
  <scope>provided</scope>
</dependency>

To:

<!-- ANT4X -->
<dependency>
  <groupId>net.sourceforge.ant4x</groupId>
  <artifactId>ant4x</artifactId>
  <version>${net.sourceforge.ant4x-version}</version>
  <scope>provided</scope>
</dependency>

The groupId of net.sourceforge was incorrect. The correct value is net.sourceforge.ant4x.

Multithreading in Bash

You can run several copies of your script in parallel, each copy for different input data, e.g. to process all *.cfg files on 4 cores:

    ls *.cfg | xargs -P 4 -n 1 read_cfg.sh

The read_cfg.sh script takes just one parameters (as enforced by -n)

SQL Delete Records within a specific Range

You gave a condition ID (>79 and < 296) then the answer is:

delete from tab
where id > 79 and id < 296

this is the same as:

delete from tab
where id between 80 and 295

if id is an integer.

All answered:

delete from tab
where id between 79 and 296

this is the same as:

delete from tab
where id => 79 and id <= 296

Mind the difference.

In Visual Basic how do you create a block comment

In Visual Studio .NET you can do Ctrl + K then C to comment, Crtl + K then U to uncomment a block.

Spring transaction REQUIRED vs REQUIRES_NEW : Rollback Transaction

If you really need to do it in separate transaction you need to use REQUIRES_NEW and live with the performance overhead. Watch out for dead locks.

I'd rather do it the other way:

Validate data on Java side.
Run everyting in one transaction.
If anything goes wrong on DB side -> it's a major error of DB or validation design. Rollback everything and throw critical top level error.
Write good unit tests.

Checkout old commit and make it a new commit

git rm -r .
git checkout HEAD~3 .
git commit

After the commit, files in the new HEAD will be the same as they were in the revision HEAD~3.

How to delete columns in pyspark dataframe

Consider 2 dataFrames:

>>> aDF.show()
+---+----+
| id|datA|
+---+----+
|  1|  a1|
|  2|  a2|
|  3|  a3|
+---+----+

and

>>> bDF.show()
+---+----+
| id|datB|
+---+----+
|  2|  b2|
|  3|  b3|
|  4|  b4|
+---+----+

To accomplish what you are looking for, there are 2 ways:

1. Different joining condition. Instead of saying aDF.id == bDF.id

aDF.join(bDF, aDF.id == bDF.id, "outer")

Write this:

aDF.join(bDF, "id", "outer").show()
+---+----+----+
| id|datA|datB|
+---+----+----+
|  1|  a1|null|
|  3|  a3|  b3|
|  2|  a2|  b2|
|  4|null|  b4|
+---+----+----+

This will automatically get rid of the extra the dropping process.

2. Use Aliasing: You will lose data related to B Specific Id's in this.

>>> from pyspark.sql.functions import col
>>> aDF.alias("a").join(bDF.alias("b"), aDF.id == bDF.id, "outer").drop(col("b.id")).show()

+----+----+----+
|  id|datA|datB|
+----+----+----+
|   1|  a1|null|
|   3|  a3|  b3|
|   2|  a2|  b2|
|null|null|  b4|
+----+----+----+

Jersey stopped working with InjectionManagerFactory not found

Here is the new dependency (August 2017)

    <!-- https://mvnrepository.com/artifact/org.glassfish.jersey.core/jersey-common -->
<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-common</artifactId>
    <version>2.0-m03</version>
</dependency>

How to create a directory in Java?

For java 7 and up:

Path path = Paths.get("/your/path/string");
Files.createDirectories(path);

It seems unnecessary to check for existence of the dir or file before creating, from createDirectories javadocs:

Creates a directory by creating all nonexistent parent directories first. Unlike the createDirectory method, an exception is not thrown if the directory could not be created because it already exists. The attrs parameter is optional file-attributes to set atomically when creating the nonexistent directories. Each file attribute is identified by its name. If more than one attribute of the same name is included in the array then all but the last occurrence is ignored.

If this method fails, then it may do so after creating some, but not all, of the parent directories.

datetime.parse and making it work with a specific format

DateTime.ParseExact(input,"yyyyMMdd HH:mm",null);

assuming you meant to say that minutes followed the hours, not seconds - your example is a little confusing.

The ParseExact documentation details other overloads, in case you want to have the parse automatically convert to Universal Time or something like that.

As @Joel Coehoorn mentions, there's also the option of using TryParseExact, which will return a Boolean value indicating success or failure of the operation - I'm still on .Net 1.1, so I often forget this one.

If you need to parse other formats, you can check out the Standard DateTime Format Strings.

My kubernetes pods keep crashing with "CrashLoopBackOff" but I can't find any log

I had same issue and now I finally resolved it. I am not using docker-compose file. I just added this line in my Docker file and it worked.

ENV CI=true

Reference: https://github.com/GoogleContainerTools/skaffold/issues/3882

How to manually force a commit in a @Transactional method?

Why don't you use spring's TransactionTemplate to programmatically control transactions? You could also restructure your code so that each "transaction block" has it's own @Transactional method, but given that it's a test I would opt for programmatic control of your transactions.

Also note that the @Transactional annotation on your runnable won't work (unless you are using aspectj) as the runnables aren't managed by spring!

@RunWith(SpringJUnit4ClassRunner.class)
//other spring-test annotations; as your database context is dirty due to the committed transaction you might want to consider using @DirtiesContext
public class TransactionTemplateTest {

@Autowired
PlatformTransactionManager platformTransactionManager;

TransactionTemplate transactionTemplate;

@Before
public void setUp() throws Exception {
    transactionTemplate = new TransactionTemplate(platformTransactionManager);
}

@Test //note that there is no @Transactional configured for the method
public void test() throws InterruptedException {

    final Contract c1 = transactionTemplate.execute(new TransactionCallback<Contract>() {
        @Override
        public Contract doInTransaction(TransactionStatus status) {
            Contract c = contractDOD.getNewTransientContract(15);
            contractRepository.save(c);
            return c;
        }
    });

    ExecutorService executorService = Executors.newFixedThreadPool(5);

    for (int i = 0; i < 5; ++i) {
        executorService.execute(new Runnable() {
            @Override  //note that there is no @Transactional configured for the method
            public void run() {
                transactionTemplate.execute(new TransactionCallback<Object>() {
                    @Override
                    public Object doInTransaction(TransactionStatus status) {
                        // do whatever you want to do with c1
                        return null;
                    }
                });
            }
        });
    }

    executorService.shutdown();
    executorService.awaitTermination(10, TimeUnit.SECONDS);

    transactionTemplate.execute(new TransactionCallback<Object>() {
        @Override
        public Object doInTransaction(TransactionStatus status) {
            // validate test results in transaction
            return null;
        }
    });
}

}

Could not connect to SMTP host: smtp.gmail.com, port: 465, response: -1

What i did was i commented out the

props.put("mail.smtp.starttls.enable","true");

Because apparently for G-mail you did not need it. Then if you haven't already done this you need to create an app password in G-mail for your program. I did that and it worked perfectly. Here this link will show you how: https://support.google.com/accounts/answer/185833.

How to center an unordered list?

To center align an unordered list, you need to use the CSS text align property. In addition to this, you also need to put the unordered list inside the div element.

Now, add the style to the div class and use the text-align property with center as its value.

See the below example.

<style>
.myDivElement{
    text-align:center;
}
.myDivElement ul li{
   display:inline;

 }
</style>
<div class="myDivElement">
<ul>
    <li>Home</li>
    <li>About</li>
    <li>Gallery</li>
    <li>Contact</li>
</ul>
</div>

Here is the reference website Center Align Unordered List

Is it valid to define functions in JSON results?

JSON explicitly excludes functions because it isn't meant to be a JavaScript-only data structure (despite the JS in the name).

Ruby/Rails: converting a Date to a UNIX timestamp

The code date.to_time.to_i should work fine. The Rails console session below shows an example:

>> Date.new(2009,11,26).to_time
=> Thu Nov 26 00:00:00 -0800 2009
>> Date.new(2009,11,26).to_time.to_i
=> 1259222400
>> Time.at(1259222400)
=> Thu Nov 26 00:00:00 -0800 2009

Note that the intermediate DateTime object is in local time, so the timestamp might be a several hours off from what you expect. If you want to work in UTC time, you can use the DateTime's method "to_utc".

What is the best way to implement constants in Java?

In Effective Java (2nd edition), it's recommended that you use enums instead of static ints for constants.

There's a good writeup on enums in Java here: http://java.sun.com/j2se/1.5.0/docs/guide/language/enums.html

Note that at the end of that article the question posed is:

So when should you use enums?

With an answer of:

Any time you need a fixed set of constants

How to see the values of a table variable at debug time in T-SQL?

DECLARE @v XML = (SELECT * FROM <tablename> FOR XML AUTO)

Insert the above statement at the point where you want to view the table's contents. The table's contents will be rendered as XML in the locals window, or you can add @v to the watches window.

enter image description here

MySQL - Operand should contain 1 column(s)

I got this error while executing a MySQL script in an Intellij console, because of adding brackets in the wrong place:

WRONG:

SELECT user.id
FROM user
WHERE id IN (:ids); # Do not put brackets around list argument

RIGHT:

SELECT user.id
FROM user
WHERE id IN :ids; # No brackets is correct

Activating Anaconda Environment in VsCode

I found a hacky solution replace your environment variable for the original python file so instead it can just call from the python.exe from your anaconda folder, so when you reference python it will reference anaconda's python.

So your only python path in env var should be like:

"C:\Anaconda3\envs\py34\", or wherever the python executable lives

If you need more details I don't mind explaining. :)

Inheritance and init method in Python

In the first situation, Num2 is extending the class Num and since you are not redefining the special method named __init__() in Num2, it gets inherited from Num.

When a class defines an __init__() method, class instantiation automatically invokes __init__() for the newly-created class instance.

In the second situation, since you are redefining __init__() in Num2 you need to explicitly call the one in the super class (Num) if you want to extend its behavior.

class Num2(Num):
    def __init__(self,num):
        Num.__init__(self,num)
        self.n2 = num*2

What generates the "text file busy" message in Unix?

If you are running the .sh from a ssh connection with a tool like MobaXTerm, and if said tool has an autosave utility to edit remote file from local machine, that will lock the file.

Closing and reopening the SSH session solves it.

How to change the height of a div dynamically based on another div using css?

In this piece of code the height of left panel will gets adjusted to the height of right panel dynamically...

function resizeDiv() {
var rh=$('.pright').height()+'px'.toString();
$('.pleft').css('height',rh);
}

You can try this here http://jsfiddle.net/SriharshaCR/7q585k1x/9/embedded/result/

YouTube API to fetch all videos on a channel

Recently I had to retrieve all videos from a channel, and according to YouTube developer documentation: https://developers.google.com/youtube/v3/docs/playlistItems/list

function playlistItemsListByPlaylistId($service, $part, $params) {
    $params = array_filter($params);
    $response = $service->playlistItems->listPlaylistItems(
        $part,
        $params
    );

    print_r($response);
}

playlistItemsListByPlaylistId($service,
    'snippet,contentDetails',
    array('maxResults' => 25, 'playlistId' => 'id of "uploads" playlist'));

Where $service is your Google_Service_YouTube object.

So you have to fetch information from the channel to retrieve the "uploads" playlist that actually has all the videos uploaded by the channel: https://developers.google.com/youtube/v3/docs/channels/list

If new with this API, I highly recommend to turn the code sample from the default snippet to the full sample.

So the basic code to retrieve all videos from a channel can be:

class YouTube
{
    const       DEV_KEY = 'YOUR_DEVELOPPER_KEY';
    private     $client;
    private     $youtube;
    private     $lastChannel;

    public function __construct()
    {
        $this->client = new Google_Client();
        $this->client->setDeveloperKey(self::DEV_KEY);
        $this->youtube = new Google_Service_YouTube($this->client);
        $this->lastChannel = false;
    }

    public function getChannelInfoFromName($channel_name)
    {
        if ($this->lastChannel && $this->lastChannel['modelData']['items'][0]['snippet']['title'] == $channel_name)
        {
            return $this->lastChannel;
        }
        $this->lastChannel = $this->youtube->channels->listChannels('snippet, contentDetails, statistics', array(
            'forUsername' => $channel_name,
        ));
        return ($this->lastChannel);
    }

    public function getVideosFromChannelName($channel_name, $max_result = 5)
    {
        $this->getChannelInfoFromName($channel_name);
        $params = [
            'playlistId' => $this->lastChannel['modelData']['items'][0]['contentDetails']['relatedPlaylists']['uploads'],
            'maxResults'=> $max_result,
        ];
        return ($this->youtube->playlistItems->listPlaylistItems('snippet,contentDetails', $params));
    }
}

$yt = new YouTube();
echo '<pre>' . print_r($yt->getVideosFromChannelName('CHANNEL_NAME'), true) . '</pre>';

Why use $_SERVER['PHP_SELF'] instead of ""

When you insert ANY variable into HTML, unless you want the browser to interpret the variable itself as HTML, it's best to use htmlspecialchars() on it. Among other things, it prevents hackers from inserting arbitrary HTML in your page.

The value of $_SERVER['PHP_SELF'] is taken directly from the URL entered in the browser. Therefore if you use it without htmlspecialchars(), you're allowing hackers to directly manipulate the output of your code.

For example, if I e-mail you a link to http://example.com/"><script>malicious_code_here()</script><span class=" and you have <form action="<?php echo $_SERVER['PHP_SELF'] ?>">, the output will be:

<form action="http://example.com/"><script>malicious_code_here()</script><span class="">

My script will run, and you will be none the wiser. If you were logged in, I may have stolen your cookies, or scraped confidential info from your page.

However, if you used <form action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']) ?>">, the output would be:

<form action="http://example.com/&quot;&gt;&lt;script&gt;cookie_stealing_code()&lt;/script&gt;&lt;span class=&quot;">

When you submitted the form, you'd have a weird URL, but at least my evil script did not run.

On the other hand, if you used <form action="">, then the output would be the same no matter what I added to my link. This is the option I would recommend.

tqdm in Jupyter Notebook prints new progress bars repeatedly

Most of the answers are outdated now. Better if you import tqdm correctly.

from tqdm import tqdm_notebook as tqdm

enter image description here

How to add a browser tab icon (favicon) for a website?

I haven't used any others, but https://realfavicongenerator.net/ seems to be a top choice, and it hasn't been mentioned on here yet.

It supports SVGs as source images for generating favicons, and it provides helpful options to override images for different platforms. In addition, by default it doesn't generate a ton a images to be backwards-compatible with every outdated platform. Instead, it gives you options to check if you want them.

From an email the developer sent me, they also have plans to add support for generating SVG favicons, as well as SVG theme-sensitivity, I think, which is a totally awesome feature.

How do I remove all null and empty string values from an object?

Using some ES6 / ES2015:

If you don't like to create an extra function and remove the items 'inline'.

Object.keys(obj).forEach(k => (!obj[k] && obj[k] !== undefined) && delete obj[k]);

jsbin

Same, written as a function.

const removeEmpty = (obj) => {
  Object.keys(obj).forEach((k) => (!obj[k] && obj[k] !== undefined) && delete obj[k]);
  return obj;
};

jsbin

This function uses recursion to delete items from nested objects as well:

const removeEmpty = (obj) => {
  Object.keys(obj).forEach(k =>
    (obj[k] && typeof obj[k] === 'object') && removeEmpty(obj[k]) ||
    (!obj[k] && obj[k] !== undefined) && delete obj[k]
  );
  return obj;
};

jsbin

Same as function before but with ES7 / 2016 Object.entries:

const removeEmpty = (obj) => {
  Object.entries(obj).forEach(([key, val])  =>
    (val && typeof val === 'object') && removeEmpty(val) ||
    (val === null || val === "") && delete obj[key]
  );
  return obj;
};

Same as third example but in plain ES5:

function removeEmpty(obj) {
  Object.keys(obj).forEach(function(key) {
    (obj[key] && typeof obj[key] === 'object') && removeEmpty(obj[key]) ||
    (obj[key] === '' || obj[key] === null) && delete obj[key]
  });
  return obj;
};

jsbin

How to set time delay in javascript

ES-6 Solution

Below is a sample code which uses aync/await to have an actual delay.

There are many constraints and this may not be useful, but just posting here for fun..

_x000D_

function delay(delayInms) {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve(2);
    }, delayInms);
  });
}

async function sample() {
  console.log('a');
  console.log('waiting...')
  let delayres = await delay(3000);
  console.log('b');
}
sample();

_x000D_

how to remove the bold from a headline?

you can simply do like that in the html part:

<span>Heading Text</span>

and in the css you can make it as an h1 block using display:

span{
display:block;
font-size:20px;
}

you will get it as a h1 without bold ,
if you want it bold just add this to the css:

font-weight:bold;

Rolling back bad changes with svn in Eclipse

If you want to do 1 file at a time you can go to the History view for the file assuming you have an Eclipse SVN plugin installed. "Team->Show History"

In the History view, find the last good version of that file, right click and choose "Get Contents". This will replace your current version with that version's contents. Then you can commit the changes when you've fixed it all up.

Facebook login "given URL not allowed by application configuration"

I kept getting this error, when using wildcard subdomains with my app. I had the site url set to: http://myapp.com and app domain also to http://myapp.com, and also the same value for the Valid OAuth redirect URIs in the advanced tab of the settings app. I tried different combinations but only setting the http://subdomain.myapp.com as the redirect value worked, of course only for that subdomain.

The solution was to empty the redirect fields, leave it blank, that worked! ;)

URL to compose a message in Gmail (with full Gmail interface and specified to, bcc, subject, etc.)

This seems to work (for now):

https://mail.google.com/mail/?view=cm&fs=1&[email protected]&su=SUBJECT&body=BODY&[email protected]

How to convert a column number (e.g. 127) into an Excel column (e.g. AA)

    public string ToBase26(int number)
    {
        if (number < 0) return String.Empty;

        int remainder = number % 26;
        int value = number / 26;

        return value == 0 ?
            String.Format("{0}", Convert.ToChar(65 + remainder)) :
            String.Format("{0}{1}", ToBase26(value - 1), Convert.ToChar(65 + remainder));
    }

What is the Windows equivalent of the diff command?

There's also Powershell (which is part of Windows). It ain't quick but it's flexible, here's the basic command. People have written various cmdlets and scripts for it if you need better formatting.

PS C:\Users\Troll> Compare-Object (gc $file1) (gc $file2)

Not part of Windows, but if you are a developer with Visual Studio, it comes with WinDiff (graphical)

But my personal favorite is BeyondCompare, which costs $30.

TypeScript add Object to array with push

class PushObjects {
    testMethod(): Array<number> { 
        //declaration and initialisation of array onject
        var objs: number[] = [1,2,3,4,5,7];
        //push the elements into the array object
        objs.push(100);
        //pop the elements from the array
        objs.pop();
        return objs;
    }   
}

let pushObj = new PushObjects();
//create the button element from the dom object 
let btn = document.createElement('button');
//set the text value of the button
btn.textContent = "Click here";
//button click event
btn.onclick = function () { 

    alert(pushObj.testMethod());

} 

document.body.appendChild(btn);

ASP.NET MVC Html.ValidationSummary(true) does not display model errors

This works better, as you can show validationMessage for a specified key:

    ModelState.AddModelError("keyName","Message");

and display it like this:

    @Html.ValidationMessage("keyName")

Programs & Examples On #Blueprint css

How to use Git?

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Cannot read property 'push' of undefined when combining arrays

Adjust UILabel height to text

Directly assigning values to C Pointers

Which terminal command to get just IP address and nothing else?

Linux

OSX

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Resize image in PHP

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iCheck check if checkbox is checked

Make iframe automatically adjust height according to the contents without using scrollbar?

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Change cursor to hand when mouse goes over a row in table

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Drop-down box dependent on the option selected in another drop-down box

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PHP Create and Save a txt file to root directory

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Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive

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Using XPATH to search text containing

pandas >= 0.18: Use `na_values=['-']` argument with `read_csv`

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If "What does `COLLATE SQL_Latin1_General_CP1_CI_AS` do?" means "What does the `COLLATE` clause of `CREATE DATABASE` do?", then:

If "What does `COLLATE SQL_Latin1_General_CP1_CI_AS` do?" means "What does this particular collation do?", then: