Where does flask look for image files?

Is the image file ayrton_senna_movie_wallpaper_by_bashgfx-d4cm6x6.jpg in your static directory? If you move it to your static directory and update your HTML as such:

<img src="/static/ayrton_senna_movie_wallpaper_by_bashgfx-d4cm6x6.jpg">

It should work.

Also, it is worth noting, there is a better way to structure this.

File structure:

app.py
static
   |----ayrton_senna_movie_wallpaper_by_bashgfx-d4cm6x6.jpg
templates
   |----index.html

app.py

from flask import Flask, render_template, url_for
app = Flask(__name__)

@app.route('/index', methods=['GET', 'POST'])
def lionel(): 
    return render_template('index.html')

if __name__ == '__main__':
    app.run()

templates/index.html

<html>
  <head>

  </head>
  <body>
    <h1>Hi Lionel Messi</h1>

  <img src="{{url_for('static', filename='ayrton_senna_movie_wallpaper_by_bashgfx-d4cm6x6.jpg')}}" />

  </body>

</html>

Doing it this way ensures that you are not hard-coding a URL path for your static assets.

Should I always use a parallel stream when possible?

A parallel stream has a much higher overhead compared to a sequential one. Coordinating the threads takes a significant amount of time. I would use sequential streams by default and only consider parallel ones if

I have a massive amount of items to process (or the processing of each item takes time and is parallelizable)
I have a performance problem in the first place
I don't already run the process in a multi-thread environment (for example: in a web container, if I already have many requests to process in parallel, adding an additional layer of parallelism inside each request could have more negative than positive effects)

In your example, the performance will anyway be driven by the synchronized access to System.out.println(), and making this process parallel will have no effect, or even a negative one.

Moreover, remember that parallel streams don't magically solve all the synchronization problems. If a shared resource is used by the predicates and functions used in the process, you'll have to make sure that everything is thread-safe. In particular, side effects are things you really have to worry about if you go parallel.

In any case, measure, don't guess! Only a measurement will tell you if the parallelism is worth it or not.

How to remove underline from a name on hover

Remove the text decoration for the anchor tag

<a name="Section 1" style="text-decoration : none">Section</a>

Cloning a private Github repo

In response to mac's answer, you can get your SSH clone URL on your github repo page, by clicking SSH on You can clone with HTTPS, SSH, or Subversion. and copy the URL.

Sound effects in JavaScript / HTML5

http://robert.ocallahan.org/2011/11/latency-of-html5-sounds.html

http://people.mozilla.org/~roc/audio-latency-repeating.html

Works OK in Firefox and Chrome for me.

To stop a sound that you started, do var sound = document.getElementById("shot").cloneNode(true); sound.play(); and later sound.pause();

Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?

Since iOS 11, you can use the native framework called PDFKit for displaying and manipulating PDFs.

After importing PDFKit, you should initialize a PDFView with a local or a remote URL and display it in your view.

if let url = Bundle.main.url(forResource: "example", withExtension: "pdf") {
    let pdfView = PDFView(frame: view.frame)
    pdfView.document = PDFDocument(url: url)
    view.addSubview(pdfView)
}

Creating a folder if it does not exists - "Item already exists"

I was not even concentrating, here is how to do it

$DOCDIR = [Environment]::GetFolderPath("MyDocuments")
$TARGETDIR = '$DOCDIR\MatchedLog'
if(!(Test-Path -Path $TARGETDIR )){
    New-Item -ItemType directory -Path $TARGETDIR
}

Is it possible to open a Windows Explorer window from PowerShell?

Just use the Invoke-Item cmdlet. For example, if you want to open a explorer window on the current directory you can do:

Invoke-Item .

break statement in "if else" - java

The issue is that you are trying to have multiple statements in an if without using {}. What you currently have is interpreted like:

if( choice==5 )
{
    System.out.println( ... );
}
break;
else
{
    //...
}

You really want:

if( choice==5 )
{
    System.out.println( ... );
    break;
}
else
{
    //...
}

Also, as Farce has stated, it would be better to use else if for all the conditions instead of if because if choice==1, it will still go through and check if choice==5, which would fail, and it will still go into your else block.

if( choice==1 )
    //...
else if( choice==2 )
    //...
else if( choice==3 )
    //...
else if( choice==4 )
    //...
else if( choice==5 )
{
    //...
}
else
    //...

A more elegant solution would be using a switch statement. However, break only breaks from the most inner "block" unless you use labels. So you want to label your loop and break from that if the case is 5:

LOOP:
for(;;)
{
    System.out.println("---> Your choice: ");
    choice = input.nextInt();
    switch( choice )
    {
        case 1:
            playGame();
            break;
        case 2:
            loadGame();
            break;
        case 2:
            options();
            break;
        case 4:
            credits();
            break;
        case 5:
            System.out.println("End of Game\n Thank you for playing with us!");
            break LOOP;
        default:
            System.out.println( ... );
    }
}

Instead of labeling the loop, you could also use a flag to tell the loop to stop.

bool finished = false;
while( !finished )
{
    switch( choice )
    {
        // ...
        case 5:
            System.out.println( ... )
            finished = true;
            break;
        // ...
    }
}

Javascript - get array of dates between 2 dates

This may help someone,

You can get the row output from this and format the row_date object as you want.

var from_date = '2016-01-01';
var to_date = '2016-02-20';

var dates = getDates(from_date, to_date);

console.log(dates);

function getDates(from_date, to_date) {
  var current_date = new Date(from_date);
  var end_date     = new Date(to_date);

  var getTimeDiff = Math.abs(current_date.getTime() - end_date.getTime());
  var date_range = Math.ceil(getTimeDiff / (1000 * 3600 * 24)) + 1 ;

  var weekday = ["SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"];
  var months = ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"];
  var dates = new Array();

  for (var i = 0; i <= date_range; i++) {
     var getDate, getMonth = '';

     if(current_date.getDate() < 10) { getDate = ('0'+ current_date.getDate());}
     else{getDate = current_date.getDate();}

    if(current_date.getMonth() < 9) { getMonth = ('0'+ (current_date.getMonth()+1));}
    else{getMonth = current_date.getMonth();}

    var row_date = {day: getDate, month: getMonth, year: current_date.getFullYear()};
    var fmt_date = {weekDay: weekday[current_date.getDay()], date: getDate, month: months[current_date.getMonth()]};
    var is_weekend = false;
    if (current_date.getDay() == 0 || current_date.getDay() == 6) {
        is_weekend = true;
    }
    dates.push({row_date: row_date, fmt_date: fmt_date, is_weekend: is_weekend});
    current_date.setDate(current_date.getDate() + 1);
 }
 return dates;
}

https://gist.github.com/pranid/3c78f36253cbbc6a41a859c5d718f362.js

Split text file into smaller multiple text file using command line

I have created a simple program for this and your question helped me complete the solution... I added one more feature and few configurations. In case you want to add a specific character/ string after every few lines (configurable). Please go through the notes. I have added the code files : https://github.com/mohitsharma779/FileSplit

Spring @Transactional read-only propagation

It seem to ignore the settings for the current active transaction, it only apply settings to a new transaction:

org.springframework.transaction.PlatformTransactionManager
TransactionStatus getTransaction(TransactionDefinition definition)
                         throws TransactionException
Return a currently active transaction or create a new one, according to the specified propagation behavior.
Note that parameters like isolation level or timeout will only be applied to new transactions, and thus be ignored when participating in active ones.
Furthermore, not all transaction definition settings will be supported by every transaction manager: A proper transaction manager implementation should throw an exception when unsupported settings are encountered.
An exception to the above rule is the read-only flag, which should be ignored if no explicit read-only mode is supported. Essentially, the read-only flag is just a hint for potential optimization.

INSTALL_FAILED_USER_RESTRICTED : android studio using redmi 4 device

Settings->Additional Settings->Developer Options

1) Turn ON Developer Options
2) Turn ON USB Debugging
3) Turn OFF MIUI optimization
4) Turn ON Install via USB

print call stack in C or C++

Linux specific, TLDR:

backtrace in glibc produces accurate stacktraces only when -lunwind is linked (undocumented platform-specific feature).
To output function name, source file and line number use #include <elfutils/libdwfl.h> (this library is documented only in its header file). backtrace_symbols and backtrace_symbolsd_fd are least informative.

On modern Linux your can get the stacktrace addresses using function backtrace. The undocumented way to make backtrace produce more accurate addresses on popular platforms is to link with -lunwind (libunwind-dev on Ubuntu 18.04) (see the example output below). backtrace uses function _Unwind_Backtrace and by default the latter comes from libgcc_s.so.1 and that implementation is most portable. When -lunwind is linked it provides a more accurate version of _Unwind_Backtrace but this library is less portable (see supported architectures in libunwind/src).

Unfortunately, the companion backtrace_symbolsd and backtrace_symbols_fd functions have not been able to resolve the stacktrace addresses to function names with source file name and line number for probably a decade now (see the example output below).

However, there is another method to resolve addresses to symbols and it produces the most useful traces with function name, source file and line number. The method is to #include <elfutils/libdwfl.h>and link with -ldw (libdw-dev on Ubuntu 18.04).

Working C++ example (test.cc):

#include <stdexcept>
#include <iostream>
#include <cassert>
#include <cstdlib>
#include <string>

#include <boost/core/demangle.hpp>

#include <execinfo.h>
#include <elfutils/libdwfl.h>

struct DebugInfoSession {
    Dwfl_Callbacks callbacks = {};
    char* debuginfo_path = nullptr;
    Dwfl* dwfl = nullptr;

    DebugInfoSession() {
        callbacks.find_elf = dwfl_linux_proc_find_elf;
        callbacks.find_debuginfo = dwfl_standard_find_debuginfo;
        callbacks.debuginfo_path = &debuginfo_path;

        dwfl = dwfl_begin(&callbacks);
        assert(dwfl);

        int r;
        r = dwfl_linux_proc_report(dwfl, getpid());
        assert(!r);
        r = dwfl_report_end(dwfl, nullptr, nullptr);
        assert(!r);
        static_cast<void>(r);
    }

    ~DebugInfoSession() {
        dwfl_end(dwfl);
    }

    DebugInfoSession(DebugInfoSession const&) = delete;
    DebugInfoSession& operator=(DebugInfoSession const&) = delete;
};

struct DebugInfo {
    void* ip;
    std::string function;
    char const* file;
    int line;

    DebugInfo(DebugInfoSession const& dis, void* ip)
        : ip(ip)
        , file()
        , line(-1)
    {
        // Get function name.
        uintptr_t ip2 = reinterpret_cast<uintptr_t>(ip);
        Dwfl_Module* module = dwfl_addrmodule(dis.dwfl, ip2);
        char const* name = dwfl_module_addrname(module, ip2);
        function = name ? boost::core::demangle(name) : "<unknown>";

        // Get source filename and line number.
        if(Dwfl_Line* dwfl_line = dwfl_module_getsrc(module, ip2)) {
            Dwarf_Addr addr;
            file = dwfl_lineinfo(dwfl_line, &addr, &line, nullptr, nullptr, nullptr);
        }
    }
};

std::ostream& operator<<(std::ostream& s, DebugInfo const& di) {
    s << di.ip << ' ' << di.function;
    if(di.file)
        s << " at " << di.file << ':' << di.line;
    return s;
}

void terminate_with_stacktrace() {
    void* stack[512];
    int stack_size = ::backtrace(stack, sizeof stack / sizeof *stack);

    // Print the exception info, if any.
    if(auto ex = std::current_exception()) {
        try {
            std::rethrow_exception(ex);
        }
        catch(std::exception& e) {
            std::cerr << "Fatal exception " << boost::core::demangle(typeid(e).name()) << ": " << e.what() << ".\n";
        }
        catch(...) {
            std::cerr << "Fatal unknown exception.\n";
        }
    }

    DebugInfoSession dis;
    std::cerr << "Stacktrace of " << stack_size << " frames:\n";
    for(int i = 0; i < stack_size; ++i) {
        std::cerr << i << ": " << DebugInfo(dis, stack[i]) << '\n';
    }
    std::cerr.flush();

    std::_Exit(EXIT_FAILURE);
}

int main() {
    std::set_terminate(terminate_with_stacktrace);
    throw std::runtime_error("test exception");
}

Compiled on Ubuntu 18.04.4 LTS with gcc-8.3:

g++ -o test.o -c -m{arch,tune}=native -std=gnu++17 -W{all,extra,error} -g -Og -fstack-protector-all test.cc
g++ -o test -g test.o -ldw -lunwind

Outputs:

Fatal exception std::runtime_error: test exception.
Stacktrace of 7 frames:
0: 0x55f3837c1a8c terminate_with_stacktrace() at /home/max/src/test/test.cc:76
1: 0x7fbc1c845ae5 <unknown>
2: 0x7fbc1c845b20 std::terminate()
3: 0x7fbc1c845d53 __cxa_throw
4: 0x55f3837c1a43 main at /home/max/src/test/test.cc:103
5: 0x7fbc1c3e3b96 __libc_start_main at ../csu/libc-start.c:310
6: 0x55f3837c17e9 _start

When no -lunwind is linked, it produces a less accurate stacktrace:

0: 0x5591dd9d1a4d terminate_with_stacktrace() at /home/max/src/test/test.cc:76
1: 0x7f3c18ad6ae6 <unknown>
2: 0x7f3c18ad6b21 <unknown>
3: 0x7f3c18ad6d54 <unknown>
4: 0x5591dd9d1a04 main at /home/max/src/test/test.cc:103
5: 0x7f3c1845cb97 __libc_start_main at ../csu/libc-start.c:344
6: 0x5591dd9d17aa _start

For comparison, backtrace_symbols_fd output for the same stacktrace is least informative:

/home/max/src/test/debug/gcc/test(+0x192f)[0x5601c5a2092f]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(+0x92ae5)[0x7f95184f5ae5]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZSt9terminatev+0x10)[0x7f95184f5b20]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(__cxa_throw+0x43)[0x7f95184f5d53]
/home/max/src/test/debug/gcc/test(+0x1ae7)[0x5601c5a20ae7]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe6)[0x7f9518093b96]
/home/max/src/test/debug/gcc/test(+0x1849)[0x5601c5a20849]

In a production version (as well as C language version) you may like to make this code extra robust by replacing boost::core::demangle, std::string and std::cout with their underlying calls.

You can also override __cxa_throw to capture the stacktrace when an exception is thrown and print it when the exception is caught. By the time it enters catch block the stack has been unwound, so it is too late to call backtrace, and this is why the stack must be captured on throw which is implemented by function __cxa_throw. Note that in a multi-threaded program __cxa_throw can be called simultaneously by multiple threads, so that if it captures the stacktrace into a global array that must be thread_local.

How to find third or n?? maximum salary from salary table?

select 
    Min(salary) 
from ( select salary from employees order by salary desc) t
where rownum<=3;

For 2nd highest salary,Change 3 to 2 in above query and for Nth highest salary to N where N = 1,2,3,4....

Why do I need to override the equals and hashCode methods in Java?

Adding to @Lombo 's answer

When will you need to override equals() ?

The default implementation of Object's equals() is

public boolean equals(Object obj) {
        return (this == obj);
}

which means two objects will be considered equal only if they have the same memory address which will be true only if you are comparing an object with itself.

But you might want to consider two objects the same if they have the same value for one or more of their properties (Refer the example given in @Lombo 's answer).

So you will override equals() in these situations and you would give your own conditions for equality.

I have successfully implemented equals() and it is working great.So why are they asking to override hashCode() as well?

Well.As long as you don't use "Hash" based Collections on your user-defined class,it is fine. But some time in the future you might want to use HashMap or HashSet and if you don't override and "correctly implement" hashCode(), these Hash based collection won't work as intended.

Override only equals (Addition to @Lombo 's answer)

myMap.put(first,someValue)
myMap.contains(second); --> But it should be the same since the key are the same.But returns false!!! How?

First of all,HashMap checks if the hashCode of second is the same as first. Only if the values are the same,it will proceed to check the equality in the same bucket.

But here the hashCode is different for these 2 objects (because they have different memory address-from default implementation). Hence it will not even care to check for equality.

If you have a breakpoint inside your overridden equals() method,it wouldn't step in if they have different hashCodes. contains() checks hashCode() and only if they are the same it would call your equals() method.

Why can't we make the HashMap check for equality in all the buckets? So there is no necessity for me to override hashCode() !!

Then you are missing the point of Hash based Collections. Consider the following :

Your hashCode() implementation : intObject%9.

The following are the keys stored in the form of buckets.

Bucket 1 : 1,10,19,... (in thousands)
Bucket 2 : 2,20,29...
Bucket 3 : 3,21,30,...
...

Say,you want to know if the map contains the key 10. Would you want to search all the buckets? or Would you want to search only one bucket?

Based on the hashCode,you would identify that if 10 is present,it must be present in Bucket 1. So only Bucket 1 will be searched !!

Oracle - How to generate script from sql developer

This worked for me:

In SQL Developer, right click the object that you want to generate a script for. i.e. the table name
Select Quick DLL > Save To File
This will then write the create statement to an external sql file.

Note, you can also highlight multiple objects at the same time, so you could generate one script that contains create statements for all tables within the database.

How to access a RowDataPacket object

db.query('select * from login',(err, results, fields)=>{
    if(err){
        console.log('error in fetching data')
    }
    var string=JSON.stringify(results);
    console.log(string);
    var json =  JSON.parse(string);
   // to get one value here is the option
    console.log(json[0].name);
})

delete map[key] in go?

Copied from Go 1 release notes

In the old language, to delete the entry with key k from the map represented by m, one wrote the statement,

m[k] = value, false

This syntax was a peculiar special case, the only two-to-one assignment. It required passing a value (usually ignored) that is evaluated but discarded, plus a boolean that was nearly always the constant false. It did the job but was odd and a point of contention.

In Go 1, that syntax has gone; instead there is a new built-in function, delete. The call

delete(m, k)

will delete the map entry retrieved by the expression m[k]. There is no return value. Deleting a non-existent entry is a no-op.

Updating: Running go fix will convert expressions of the form m[k] = value, false into delete(m, k) when it is clear that the ignored value can be safely discarded from the program and false refers to the predefined boolean constant. The fix tool will flag other uses of the syntax for inspection by the programmer.

How to get a web page's source code from Java

I am sure that you have found a solution somewhere over the past 2 years but the following is a solution that works for your requested site

package javasandbox;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
*
* @author Ryan.Oglesby
*/
public class JavaSandbox {

private static String sURL;

/**
 * @param args the command line arguments
 */
public static void main(String[] args) throws MalformedURLException, IOException {
    sURL = "http://www.cumhuriyet.com.tr/?hn=298710";
    System.out.println(sURL);
    URL url = new URL(sURL);
    HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
    //set http request headers
            httpCon.addRequestProperty("Host", "www.cumhuriyet.com.tr");
            httpCon.addRequestProperty("Connection", "keep-alive");
            httpCon.addRequestProperty("Cache-Control", "max-age=0");
            httpCon.addRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
            httpCon.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36");
            httpCon.addRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
            httpCon.addRequestProperty("Accept-Language", "en-US,en;q=0.8");
            //httpCon.addRequestProperty("Cookie", "JSESSIONID=EC0F373FCC023CD3B8B9C1E2E2F7606C; lang=tr; __utma=169322547.1217782332.1386173665.1386173665.1386173665.1; __utmb=169322547.1.10.1386173665; __utmc=169322547; __utmz=169322547.1386173665.1.1.utmcsr=stackoverflow.com|utmccn=(referral)|utmcmd=referral|utmcct=/questions/8616781/how-to-get-a-web-pages-source-code-from-java; __gads=ID=3ab4e50d8713e391:T=1386173664:S=ALNI_Mb8N_wW0xS_wRa68vhR0gTRl8MwFA; scrElm=body");
            HttpURLConnection.setFollowRedirects(false);
            httpCon.setInstanceFollowRedirects(false);
            httpCon.setDoOutput(true);
            httpCon.setUseCaches(true);

            httpCon.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(httpCon.getInputStream(), "UTF-8"));
            String inputLine;
            StringBuilder a = new StringBuilder();
            while ((inputLine = in.readLine()) != null)
                a.append(inputLine);
            in.close();

            System.out.println(a.toString());

            httpCon.disconnect();
}
}

Lint: How to ignore "<key> is not translated in <language>" errors?

Add following to your gradle file in android section

    lintOptions {
       disable 'MissingTranslation'
    }

File path issues in R using Windows ("Hex digits in character string" error)

Please do not mark this response as correct as smitec has already answered correctly. I'm including a convenience function I keep in my .First library that makes converting a windows path to the format that works in R (the methods described by Sacha Epskamp). Simply copy the path to your clipboard (ctrl + c) and then run the function as pathPrep(). No need for an argument. The path is printed to your console correctly and written to your clipboard for easy pasting to a script. Hope this is helpful.

pathPrep <- function(path = "clipboard") {
    y <- if (path == "clipboard") {
        readClipboard()
    } else {
        cat("Please enter the path:\n\n")
        readline()
    }
    x <- chartr("\\", "/", y)
    writeClipboard(x)
    return(x)
}

How can I get the current directory name in Javascript?

For both / and \:

window.location.pathname.replace(/[^\\\/]*$/, '');

To return without the trailing slash, do:

window.location.pathname.replace(/[\\\/][^\\\/]*$/, '');

String to HashMap JAVA

You can also use JSONObject class from json.org to this will convert your HashMap to JSON string which is well formatted

Example:

Map<String,Object> map = new HashMap<>();
map.put("myNumber", 100);
map.put("myString", "String");

JSONObject json= new JSONObject(map);

String result= json.toString();

System.out.print(result);

result:

{'myNumber':100, 'myString':'String'}

Your can also get key from it like

System.out.print(json.get("myNumber"));

result:

Entity Framework Core add unique constraint code-first

None of these methods worked for me in .NET Core 2.2 but I was able to adapt some code I had for defining a different primary key to work for this purpose.

In the instance below I want to ensure the OutletRef field is unique:

public class ApplicationDbContext : IdentityDbContext
    {
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            modelBuilder.Entity<Outlet>()
                .HasIndex(o => new { o.OutletRef });
        }
    }

This adds the required unique index in the database. What it doesn't do though is provide the ability to specify a custom error message.

Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters

I would reply to Peter Mortensen, but I don't have enough reputation.

His expressions are perfect for each of the specified minimum requirements. The problem with his expressions that don't require special characters is that they also don't ALLOW special characters, so they also enforce maximum requirements, which I don't believe the OP requested. Normally you want to allow your users to make their password as strong as they want; why restrict strong passwords?

So, his "minimum eight characters, at least one letter and one number" expression:

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$

achieves the minimum requirement, but the remaining characters can only be letter and numbers. To allow (but not require) special characters, you should use something like:

^(?=.*[A-Za-z])(?=.*\d).{8,}$ to allow any characters

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d$@$!%*#?&]{8,}$ to allow specific special characters

Likewise, "minimum eight characters, at least one uppercase letter, one lowercase letter and one number:"

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$

meets that minimum requirement, but only allows letters and numbers. Use:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$ to allow any characters

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\d$@$!%*?&]{8,} to allow specific special characters.

SQL Server 2000: How to exit a stored procedure?

Unless you specify a severity of 20 or higher, raiserror will not stop execution. See the MSDN documentation.

The normal workaround is to include a return after every raiserror:

if @whoops = 1
    begin
    raiserror('Whoops!', 18, 1)
    return -1
    end

ASP.Net MVC - Read File from HttpPostedFileBase without save

A slight change to Thangamani Palanisamy answer, which allows the Binary reader to be disposed and corrects the input length issue in his comments.

string result = string.Empty;

using (BinaryReader b = new BinaryReader(file.InputStream))
{
  byte[] binData = b.ReadBytes(file.ContentLength);
  result = System.Text.Encoding.UTF8.GetString(binData);
}

Find object by id in an array of JavaScript objects

Performance

Today 2020.06.20 I perform test on MacOs High Sierra on Chrome 81.0, Firefox 77.0 and Safari 13.1 for chosen solutions.

Conclusions for solutions which use precalculations

Solutions with precalculations (K,L) are (much much) faster than other solutions and will not be compared with them - probably they are use some special build-in browser optimisations

surprisingly on Chrome and Safari solution based on Map (K) are much faster than solution based on object {} (L)
surprisingly on Safari for small arrays solution based on object {} (L) is slower than traditional for (E)
surprisingly on Firefox for small arrays solution based on Map (K) is slower than traditional for (E)

Conclusions when searched objects ALWAYS exists

solution which use traditional for (E) is fastest for small arrays and fast for big arrays
solution using cache (J) is fastest for big arrays - surprisingly for small arrays is medium fast
solutions based on find (A) and findIndex (B) are fast for small arras and medium fast on big arrays
solution based on $.map (H) is slowest on small arrays
solution based on reduce (D) is slowest on big arrays

Conclusions when searched objects NEVER exists

solution based on traditional for (E) is fastest on small and big arrays (except Chrome-small arrays where it is second fast)
solution based on reduce (D) is slowest on big arrays
solution which use cache (J) is medium fast but can be speed up if we save in cache also keys which have null values (which was not done here because we want to avoid unlimited memory consumption in cache in case when many not existing keys will be searched)

Details

For solutions

without precalculations: A B C D E F G H I J (the J solution use 'inner' cache and it speed depend on how often searched elements will repeat)
with precalculations K L

I perform four tests. In tests I want to find 5 objects in 10 loop iterations (the objects ID not change during iterations) - so I call tested method 50 times but only first 5 times have unique id values:

small array (10 elements) and searched object ALWAYS exists - you can perform it HERE
big array (10k elements) and searched object ALWAYS exist - you can perform it HERE
small array (10 elements) and searched object NEVER exists - you can perform it HERE
big array (10k elements) and searched object NEVER exists - you can perform it HERE

Tested codes are presented below

_x000D_

function A(arr, id) {
  return arr.find(o=> o.id==id);
}

function B(arr, id) {
  let idx= arr.findIndex(o=> o.id==id);
  return arr[idx];
}

function C(arr, id) {
  return arr.filter(o=> o.id==id)[0];
}

function D(arr, id) {
  return arr.reduce((a, b) => (a.id==id && a) || (b.id == id && b));
}

function E(arr, id) {
  for (var i = 0; i < arr.length; i++) if (arr[i].id==id) return arr[i];
  return null;
}

function F(arr, id) {
  var retObj ={};
  $.each(arr, (index, obj) => {
    if (obj.id == id) { 
      retObj = obj;
      return false;
    }
  });
  return retObj;
}

function G(arr, id) {
  return $.grep(arr, e=> e.id == id )[0];
}

function H(arr, id) {
  return $.map(myArray, function(val) {
    return val.id == id ? val : null;
  })[0];
}

function I(arr, id) {
  return _.find(arr, o => o.id==id);
}

let J = (()=>{
  let cache = new Map();
  return function J(arr,id,el=null) { 
    return cache.get(id) || (el=arr.find(o=> o.id==id), cache.set(id,el), el);
  }
})();

function K(arr, id) {
  return mapK.get(id)
}

function L(arr, id) {
  return mapL[id];
}



// -------------
// TEST
// -------------

console.log('Find id=5');

myArray = [...Array(10)].map((x,i)=> ({'id':`${i}`, 'foo':`bar_${i}`}));
const mapK = new Map( myArray.map(el => [el.id, el]) );
const mapL = {}; myArray.forEach(el => mapL[el.id]=el);



[A,B,C,D,E,F,G,H,I,J,K,L].forEach(f=> console.log(`${f.name}: ${JSON.stringify(f(myArray, '5'))}`));

console.log('Whole array',JSON.stringify(myArray));

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

This snippet only presents tested codes

_x000D_

Example tests results for Chrome for small array where searched objects always exists

What is the list of valid @SuppressWarnings warning names in Java?

It depends on your IDE or compiler.

Here is a list for Eclipse Galileo:

all to suppress all warnings

boxing to suppress warnings relative to boxing/unboxing operations

cast to suppress warnings relative to cast operations

dep-ann to suppress warnings relative to deprecated annotation

deprecation to suppress warnings relative to deprecation

fallthrough to suppress warnings relative to missing breaks in switch statements

finally to suppress warnings relative to finally block that don’t return

hiding to suppress warnings relative to locals that hide variable

incomplete-switch to suppress warnings relative to missing entries in a switch statement (enum case)

nls to suppress warnings relative to non-nls string literals

null to suppress warnings relative to null analysis

restriction to suppress warnings relative to usage of discouraged or forbidden references

serial to suppress warnings relative to missing serialVersionUID field for a serializable class

static-access to suppress warnings relative to incorrect static access

synthetic-access to suppress warnings relative to unoptimized access from inner classes

unchecked to suppress warnings relative to unchecked operations

unqualified-field-access to suppress warnings relative to field access unqualified

unused to suppress warnings relative to unused code

List for Indigo adds:

javadoc to suppress warnings relative to javadoc warnings

rawtypes to suppress warnings relative to usage of raw types

static-method to suppress warnings relative to methods that could be declared as static

super to suppress warnings relative to overriding a method without super invocations

List for Juno adds:

resource to suppress warnings relative to usage of resources of type Closeable

sync-override to suppress warnings because of missing synchronize when overriding a synchronized method

Kepler and Luna use the same token list as Juno (list).

Others will be similar but vary.

Mockito - NullpointerException when stubbing Method

you need to initialize MockitoAnnotations.initMocks(this) method has to called to initialize annotated fields.

   @Before public void initMocks() {
       MockitoAnnotations.initMocks(this);
   }

for more details see Doc

2 "style" inline css img tags?

Do not use more than one style attribute. Just seperate styles in the style attribute with ; It is a block of inline CSS, so think of this as you would do CSS in a separate stylesheet.

So in this case its: style="height:100px;width:100px;"

You can use this for any CSS style, so if you wanted to change the colour of the text to white: style="height:100px;width:100px;color:#ffffff" and so on.

However, it is worth using inline CSS sparingly, as it can make code less manageable in future. Using an external stylesheet may be a better option for this. It depends really on your requirements. Inline CSS does make for quicker coding.

Play infinitely looping video on-load in HTML5

For iPhone it works if you add also playsinline so:

<video width="320" height="240" autoplay loop muted playsinline>
  <source src="movie.mp4" type="video/mp4" />
</video>

Converts scss to css

In terminal run this command in the folder where the systlesheets are:

sass --watch style.scss:style.css

Source:

http://sass-lang.com/

When ever it notices a change in the .scss file it will update your .css

This only works when your .scss is on your local machine. Try copying the code to a file and running it locally.

error: Libtool library used but 'LIBTOOL' is undefined

For folks who ended up here and are using CYGWIN, install following packages in cygwin and re-run:

cygwin32-libtool
libtool
libtool-debuginfo

How to subtract 30 days from the current datetime in mysql?

SELECT date_format(current_date - INTERVAL 50 DAY,'%d-%b-%Y')

You can format by using date format in SQL.

How to convert an object to JSON correctly in Angular 2 with TypeScript

If you are solely interested in outputting the JSON somewhere in your HTML, you could also use a pipe inside an interpolation. For example:

<p> {{ product | json }} </p>

I am not entirely sure it works for every AngularJS version, but it works perfectly in my Ionic App (which uses Angular 2+).

How to plot a subset of a data frame in R?

Most straightforward option:

plot(var1[var3<155],var2[var3<155])

It does not look good because of code redundancy, but is ok for fastndirty hacking.

Using jQuery To Get Size of Viewport

Please note that CSS3 viewport units (vh,vw) wouldn't play well on iOS When you scroll the page, viewport size is somehow recalculated and your size of element which uses viewport units also increases. So, actually some javascript is required.

Flexbox not giving equal width to elements

To create elements with equal width using Flex, you should set to your's child (flex elements):

flex-basis: 25%;
flex-grow: 0;

It will give to all elements in row 25% width. They will not grow and go one by one.

If statement in select (ORACLE)

SELECT (CASE WHEN ISSUE_DIVISION = ISSUE_DIVISION_2 THEN 1 ELSE 0 END) AS ISSUES
    --  <add any columns to outer select from inner query> 
  FROM
 (  -- your query here --
   select 'CARAT Issue Open' issue_comment, ...., ..., 
          substr(gcrs.stream_name,1,case when instr(gcrs.stream_name,' (')=0 then 100 else  instr(gcrs.stream_name,' (')-1 end) ISSUE_DIVISION,
          case when gcrs.STREAM_NAME like 'NON-GT%' THEN 'NON-GT' ELSE gcrs.STREAM_NAME END as ISSUE_DIVISION_2
     from ....
    where UPPER(ISSUE_STATUS) like '%OPEN%'
 )
 WHERE... -- optional --

Mobile Safari: Javascript focus() method on inputfield only works with click?

This solution works well, I tested on my phone:

document.body.ontouchend = function() { document.querySelector('[name="name"]').focus(); };

enjoy

How to access custom attributes from event object in React?

// Method inside the component
userClick(event){
 let tag = event.currentTarget.dataset.tag;
 console.log(tag); // should return Tagvalue
}
// when render element
<a data-tag="TagValue" onClick={this.userClick}>Click me</a>

python - checking odd/even numbers and changing outputs on number size

My solution basically we have two string and with the & we get the right index:

res = ["Even", "Odd"]
print(res[x & 1])

Please note that it seems slower than other alternatives:

#!/usr/bin/env python3
import math
import random
from timeit import timeit

res = ["Even", "Odd"]

def foo(x):
    return res[x & 1]

def bar(x):
    if x & 1:
        return "Odd"
    return "Even"

la = lambda x : "Even" if not x % 2 else "Odd"

iter = 10000000

time = timeit('bar(random.randint(1, 1000))', "from __main__ import bar, random", number=iter)
print(time)
time = timeit('la(random.randint(1, 1000))', "from __main__ import la, random", number=iter)
print(time)
time = timeit('foo(random.randint(1, 1000))', "from __main__ import foo, random", number=iter)
print(time)

output:
8.05739480999182
8.170479692984372
8.892275177990086

java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonFactory

You have to add one jar : jackson-annotations-2.1.2.jar You can download it from here and add it to the class path If you are using the gradle then add the following dependency.

compile 'com.fasterxml.jackson.jaxrs:jackson-jaxrs-json-provider:2.5.2'

org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

Your Event.hbm.xml says:

<set name="attendees" cascade="all">
    <key column="attendeeId" />
    <one-to-many class="Attendee" />
</set>

In plain english, this means that the column Attendee.attendeeId is the foreign key for the association attendees and points to the primary key of Event.

When you add those Attendees to the event, hibernate updates the foreign key to express the changed association. Since that same column is also the primary key of Attendee, this violates the primary key constraint.

Since an Attendee's identity and event participation are independent, you should use separate columns for the primary and foreign key.

Edit: The selects might be because you don't appear to have a version property configured, making it impossible for hibernate to know whether the attendees already exists in the database (they might have been loaded in a previous session), so hibernate emits selects to check. As for the update statements, it was probably easier to implement that way. If you want to get rid of these separate updates, I recommend mapping the association from both ends, and declare the Event-end as inverse.

C++ Passing Pointer to Function (Howto) + C++ Pointer Manipulation

It might be easier for you to understand using Functionoids which are expressively neater and more powerful to use, see this excellent and highly recommended C++ FAQ lite, in particular, look at section 33.12 onwards, but nonetheless, read it from the start of that section to gain a grasp and understanding of it.

To answer your question:

typedef void (*foobar)() fubarfn;

void Fun(fubarfn& baz){
   fubarfn = baz;
   baz();
}

Edit:

& means the reference address
* means the value of what's contained at the reference address, called de-referencing

So using the reference, example below, shows that we are passing in a parameter, and directly modify it.

void FunByRef(int& iPtr){
    iPtr = 2;
}

int main(void){
    // ...
    int n;
    FunByRef(n);
    cout << n << endl; // n will have value of 2
}

How to debug JavaScript / jQuery event bindings with Firebug or similar tools?

jQuery stores events in the following:

$("a#somefoo").data("events")

Doing a console.log($("a#somefoo").data("events")) should list the events attached to that element.

How to hide keyboard in swift on pressing return key?

All in One Hide Keyboard and Move View on Keyboard Open: Swift 5

override func viewDidLoad() {
    super.viewDidLoad()
    let tap = UITapGestureRecognizer(target: self, action: #selector(taped))
    view.addGestureRecognizer(tap)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(KeyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
}


   override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(true)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}
 @objc func taped(){

    self.view.endEditing(true)

}

@objc func KeyboardWillShow(sender: NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y == 0{
        self.view.frame.origin.y -= keyboardSize.height
    }


}

@objc func KeyboardWillHide(sender : NSNotification){

    let keyboardSize : CGSize = ((sender.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size)!
    if self.view.frame.origin.y != 0{
        self.view.frame.origin.y += keyboardSize.height
    }

}

Replace string within file contents

#!/usr/bin/python

with open(FileName) as f:
    newText=f.read().replace('A', 'Orange')

with open(FileName, "w") as f:
    f.write(newText)

How to get the index with the key in Python dictionary?

#Creating dictionary
animals = {"Cat" : "Pat", "Dog" : "Pat", "Tiger" : "Wild"}

#Convert dictionary to list (array)
keys = list(animals)

#Printing 1st dictionary key by index
print(keys[0])

#Done :)

Running shell command and capturing the output

You can use following commands to run any shell command. I have used them on ubuntu.

import os
os.popen('your command here').read()

Note: This is deprecated since python 2.6. Now you must use subprocess.Popen. Below is the example

import subprocess

p = subprocess.Popen("Your command", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()[0]
print p.split("\n")

Comparing chars in Java

If your input is a character and the characters you are checking against are mostly consecutive you could try this:

if ((symbol >= 'A' && symbol <= 'Z') || symbol == '?') {
    // ...
}

However if your input is a string a more compact approach (but slower) is to use a regular expression with a character class:

if (symbol.matches("[A-Z?]")) {
    // ...
}

If you have a character you'll first need to convert it to a string before you can use a regular expression:

if (Character.toString(symbol).matches("[A-Z?]")) {
    // ...
}

Can a div have multiple classes (Twitter Bootstrap)

Absolutely, divs can have more than one class and with some Bootstrap components you'll often need to have multiple classes for them to function as you want them to. Applying multiple classes of course is possible outside of bootstrap as well. All you have to do is separate each class with a space.

Example below:

<label class="checkbox inline">
   <input type="checkbox" id="inlineCheckbox1" value="option1"> 1
</label>

How do I Merge two Arrays in VBA?

Here's a version that uses a collection object to combine two 1-d arrays and pass them to a 3rd array. Doesn't work for multi-dimensional arrays.

Function joinArrays(arr1 As Variant, arr2 As Variant) As Variant
 Dim arrToReturn() As Variant, myCollection As New Collection
 For Each x In arr1: myCollection.Add x: Next
 For Each y In arr2: myCollection.Add y: Next

 ReDim arrToReturn(1 To myCollection.Count)
 For i = 1 To myCollection.Count: arrToReturn(i) = myCollection.Item(i): Next
 joinArrays = arrToReturn
End Function

Hiding elements in responsive layout?

New visible classes added to Bootstrap

Extra small devices Phones (<768px) (Class names : .visible-xs-block, hidden-xs)

Small devices Tablets (=768px) (Class names : .visible-sm-block, hidden-sm)

Medium devices Desktops (=992px) (Class names : .visible-md-block, hidden-md)

Large devices Desktops (=1200px) (Class names : .visible-lg-block, hidden-lg)

For more information : http://getbootstrap.com/css/#responsive-utilities

Below is deprecated as of v3.2.0

Extra small devices Phones (<768px) (Class names : .visible-xs, hidden-xs)

Small devices Tablets (=768px) (Class names : .visible-sm, hidden-sm)

Medium devices Desktops (=992px) (Class names : .visible-md, hidden-md)

Large devices Desktops (=1200px) (Class names : .visible-lg, hidden-lg)

Much older Bootstrap

.hidden-phone, .hidden-tablet etc. are unsupported/obsolete.

UPDATE:

In Bootstrap 4 there are 2 types of classes:

The hidden-*-up which hide the element when the viewport is at the given breakpoint or wider.
hidden-*-down which hide the element when the viewport is at the given breakpoint or smaller.

Also, the new xl viewport is added for devices that are more then 1200px width. For more information click here.

React-router: How to manually invoke Link?

Ok, I think I was able to find a proper solution for that.

Now, instead of sending <Link/> as prop to Document, I send <NextLink/> which is a custom wrapper for the react-router Link. By doing that, I'm able to have the right arrow as part of the Link structure while still avoiding to have routing code inside Document object.

The updated code looks like follows:

//in NextLink.js
var React = require('react');
var Right = require('./Right');

var NextLink = React.createClass({
    propTypes: {
        link: React.PropTypes.node.isRequired
    },

    contextTypes: {
        transitionTo: React.PropTypes.func.isRequired
    },

    _onClickRight: function() {
        this.context.transitionTo(this.props.link.props.to);
    },

    render: function() {
        return (
            <div>
                {this.props.link}
                <Right onClick={this._onClickRight} />
            </div>  
        );
    }
});

module.exports = NextLink;

...
//in MasterPage.js
var sampleLink = <Link to="/sample">Go To Sample</Link>
var nextLink = <NextLink link={sampleLink} />
<Document next={nextLink} />

//in Document.js
...
var Document = React.createClass({
   render: function() {
      return (
         ...
         <div>{this.props.next}</div>
         ...
      );
   }
});
...

P.S: If you are using the latest version of react-router you may need to use this.context.router.transitionTo instead of this.context.transitionTo. This code will work fine for react-router version 0.12.X.

Using IF ELSE statement based on Count to execute different Insert statements

Simply use the following:

IF((SELECT count(*) FROM table)=0)
BEGIN

....

END

How do I add a submodule to a sub-directory?

one-liner bash script to help facility Chris's answer above, as I had painted myself in a corner as well using Vundle updates to my .vim scripts. DEST is the path to the directory containing your submodules. Do this after doing git rm -r $DEST

DEST='path'; for file in `ls ${DEST}`; do git submodule add `grep url ${DEST}/${file}/.git/config|awk -F= '{print $2}'` ${DEST}/${file}; done

cheers

How to add multiple jar files in classpath in linux

For linux users, you should know the following:

$CLASSPATH is specifically what Java uses to look through multiple directories to find all the different classes it needs for your script (unless you explicitly tell it otherwise with the -cp override). Using -cp (--classpath) requires that you keep track of all the directories manually and copy-paste that line every time you run the program (not preferable IMO).
The colon (":") character separates the different directories. There is only one $CLASSPATH and it has all the directories in it. So, when you run "export CLASSPATH=...." you want to include the current value "$CLASSPATH" in order to append to it. For example:
```
export CLASSPATH=.
export CLASSPATH=$CLASSPATH:/usr/share/java/mysql-connector-java-5.1.12.jar
```
In the first line above, you start CLASSPATH out with just a simple 'dot' which is the path to your current working directory. With that, whenever you run java it will look in the current working directory (the one you're in) for classes. In the second line above, $CLASSPATH grabs the value that you previously entered (.) and appends the path to a mysql dirver. Now, java will look for the driver AND for your classes.
```
echo $CLASSPATH
```
is super handy, and what it returns should read like a colon-separated list of all the directories you want java looking in for what it needs to run your script.
Tomcat does not use CLASSPATH. Read what to do about that here: https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html

How to style UITextview to like Rounded Rect text field?

This is an old question, and I was also searched for this questions answer. luvieeres' answer is 100% correct and later Rob added some code. That is excellent, but I found a third party in another questions answer which seems very helpful to me. I was not only searched for similar look of UITextField over UITextView, I was also searched for multiline support. ChatInputSample satisfied both. Thats why I think this third party might be helpful to others. Also thanks to Timur, he mentioned this open source in here.

How to send email in ASP.NET C#

Try the following :

try
{
    var fromEmailAddress =  ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
    var fromEmailDisplayName = ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
    var fromEmailPassword = ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
    var smtpHost = ConfigurationManager.AppSettings["SMTPHost"].ToString();
    var smtpPort = ConfigurationManager.AppSettings["SMTPPort"].ToString();

    string body = "Your registration has been done successfully. Thank you.";
    MailMessage message = new MailMessage(new MailAddress(fromEmailAddress, fromEmailDisplayName), new MailAddress(ud.LoginId, ud.FullName));
    message.Subject = "Thank You For Your Registration";
    message.IsBodyHtml = true;
    message.Body = body;

    var client = new SmtpClient();
    client.Credentials = new NetworkCredential(fromEmailAddress, fromEmailPassword);
    client.Host = smtpHost;
    client.EnableSsl = true;
    client.Port = !string.IsNullOrEmpty(smtpPort) ? Convert.ToInt32(smtpPort) : 0;
    client.Send(message);
}
catch (Exception ex)
{
    throw (new Exception("Mail send failed to loginId " + ud.LoginId + ", though registration done."));
}

And then in you web.config add the following in between

<!--Email Config-->
<add key="FromEmailAddress" value="sender emailaddress"/>
<add key="FromEmailDisplayName" value="Display Name"/>
<add key="FromEmailPassword" value="sender Password"/>
<add key="SMTPHost" value="smtp-proxy.tm.net.my"/>
<add key="SMTPPort" value="smptp Port"/>

Why does my sorting loop seem to append an element where it shouldn't?

Instead of this line

if(Array[i].compareTo(Array[j])<0)

use this line

if(Array[i].trim().compareTo(Array[j].trim())<0)

and you are good to go. The reason your current code is not working is explained by other users already. This above replacement is one workaround amongst several that you could apply.

simulate background-size:cover on <video> or <img>

Old question, but in case anyone sees this, the best answer in my opinion is to convert the video into an animated GIF. This gives you much more control and you can just treat it like an image. It's also the only way for it to work on mobile, since you can't autoplay videos. I know the question is asking to do it in an <img> tag, but I don't really see the downside of using a <div> and doing background-size: cover

How to resolve git's "not something we can merge" error

This answer is not related to the above question, but I faced a similar issue, and maybe this will be useful to someone. I am trying to merge my feature branch to master like below:

$ git merge fix-load

for this got the following error message:

merge: fix-load - not something we can merge

I looked into above all solutions, but not none of the worked.

Finally, I realized the issue cause is a spelling mistake on my branch name (actually, the merge branch name is fix-loads).

What is the easiest way to clear a database from the CLI with manage.py in Django?

Using Django Extensions, running:

./manage.py reset_db

Will clear the database tables, then running:

./manage.py syncdb

Will recreate them (south may ask you to migrate things).

SSRS expression to format two decimal places does not show zeros

Format(Fields!CUL1.Value, "0.00") would work better since @abe suggests they want to show 0.00 , and if the value was 0, "#0.##" would show "0".

AngularJS $location not changing the path

Instead of $location.path(...) to change or refresh the page, I used the service $window. In Angular this service is used as interface to the window object, and the window object contains a property location which enables you to handle operations related to the location or URL stuff.

For example, with window.location you can assign a new page, like this:

$window.location.assign('/');

Or refresh it, like this:

$window.location.reload();

It worked for me. It's a little bit different from you expect but works for the given goal.

Copy tables from one database to another in SQL Server

SQL Server Management Studio's "Import Data" task (right-click on the DB name, then tasks) will do most of this for you. Run it from the database you want to copy the data into.

If the tables don't exist it will create them for you, but you'll probably have to recreate any indexes and such. If the tables do exist, it will append the new data by default but you can adjust that (edit mappings) so it will delete all existing data.

I use this all the time and it works fairly well.

Cause of a process being a deadlock victim

Here is how this particular deadlock problem actually occurred and how it was actually resolved. This is a fairly active database with 130K transactions occurring daily. The indexes in the tables in this database were originally clustered. The client requested us to make the indexes nonclustered. As soon as we did, the deadlocking began. When we reestablished the indexes as clustered, the deadlocking stopped.

"Error 1067: The process terminated unexpectedly" when trying to start MySQL

I've got the same problem, and what worked for me is in THIS OTHER ANSWER.

I didn't replicated it here because it is NOT A CORRECT THING TO DO.

Basically is a re-install being sure to delete everything very well and using 32 bit versions.

Get the Last Inserted Id Using Laravel Eloquent

Use insertGetId to insert and get inserted id at the same time

From doc

If the table has an auto-incrementing id, use the insertGetId method to insert a record and then retrieve the ID:

By Model

$id = Model::insertGetId(["name"=>"Niklesh","email"=>"[email protected]"]);

By DB

$id = DB::table('users')->insertGetId(["name"=>"Niklesh","email"=>"[email protected]"]);

For more details : https://laravel.com/docs/5.5/queries#inserts

Stop handler.postDelayed()

this may be old, but for those looking for answer you can use this...

public void stopHandler() {
   handler.removeMessages(0);
}

cheers

LaTeX: Multiple authors in a two-column article

What about using a tabular inside \author{}, just like in IEEE macros:

\documentclass{article}
\begin{document}
\title{Hello, World}
\author{
\begin{tabular}[t]{c@{\extracolsep{8em}}c} 
I. M. Author  & M. Y. Coauthor \\
My Department & Coauthor Department \\ 
My Institute & Coauthor Institute \\
email, address & email, address
\end{tabular}
}
\maketitle    
\end{document}

This will produce two columns authors with any documentclass.

Results:

How to change legend size with matplotlib.pyplot

On my install, FontProperties only changes the text size, but it's still too large and spaced out. I found a parameter in pyplot.rcParams: legend.labelspacing, which I'm guessing is set to a fraction of the font size. I've changed it with

pyplot.rcParams.update({'legend.labelspacing':0.25})

I'm not sure how to specify it to the pyplot.legend function - passing

prop={'labelspacing':0.25}

prop={'legend.labelspacing':0.25}

comes back with an error.

How does facebook, gmail send the real time notification?

One important issue with long polling is error handling. There are two types of errors:

The request might timeout in which case the client should reestablish the connection immediately. This is a normal event in long polling when no messages have arrived.
A network error or an execution error. This is an actual error which the client should gracefully accept and wait for the server to come back on-line.

The main issue is that if your error handler reestablishes the connection immediately also for a type 2 error, the clients would DOS the server.

Both answers with code sample miss this.

function longPoll() { 
        var shouldDelay = false;

        $.ajax({
            url: 'poll.php',
            async: true,            // by default, it's async, but...
            dataType: 'json',       // or the dataType you are working with
            timeout: 10000,          // IMPORTANT! this is a 10 seconds timeout
            cache: false

        }).done(function (data, textStatus, jqXHR) {
             // do something with data...

        }).fail(function (jqXHR, textStatus, errorThrown ) {
            shouldDelay = textStatus !== "timeout";

        }).always(function() {
            // in case of network error. throttle otherwise we DOS ourselves. If it was a timeout, its normal operation. go again.
            var delay = shouldDelay ? 10000: 0;
            window.setTimeout(longPoll, delay);
        });
}
longPoll(); //fire first handler

Variable name as a string in Javascript

You can reflect on types in javascript and get the name of properties and methods but what you need is sth like Lambda Expressions Trees in .NET, I think it's not be possible due to dynamic nature and lack of static type system in javascript.

How do I install a JRE or JDK to run the Android Developer Tools on Windows 7?

If using win7 64 bit OS:

After installing the latest JDK make sure you copy the jre folder from the install location {C:\Program Files\Java\jdk1.7.0_40} directly to your eclipse folder as even pathing it apparently does nothing on win7.

Mad

edit:

Actual jdk version number on folder name will vary as newer versions are released

How to connect HTML Divs with Lines?

I made something like this to my project

_x000D_

function adjustLine(from, to, line){_x000D_
_x000D_
  var fT = from.offsetTop  + from.offsetHeight/2;_x000D_
  var tT = to.offsetTop    + to.offsetHeight/2;_x000D_
  var fL = from.offsetLeft + from.offsetWidth/2;_x000D_
  var tL = to.offsetLeft   + to.offsetWidth/2;_x000D_
  _x000D_
  var CA   = Math.abs(tT - fT);_x000D_
  var CO   = Math.abs(tL - fL);_x000D_
  var H    = Math.sqrt(CA*CA + CO*CO);_x000D_
  var ANG  = 180 / Math.PI * Math.acos( CA/H );_x000D_
_x000D_
  if(tT > fT){_x000D_
      var top  = (tT-fT)/2 + fT;_x000D_
  }else{_x000D_
      var top  = (fT-tT)/2 + tT;_x000D_
  }_x000D_
  if(tL > fL){_x000D_
      var left = (tL-fL)/2 + fL;_x000D_
  }else{_x000D_
      var left = (fL-tL)/2 + tL;_x000D_
  }_x000D_
_x000D_
  if(( fT < tT && fL < tL) || ( tT < fT && tL < fL) || (fT > tT && fL > tL) || (tT > fT && tL > fL)){_x000D_
    ANG *= -1;_x000D_
  }_x000D_
  top-= H/2;_x000D_
_x000D_
  line.style["-webkit-transform"] = 'rotate('+ ANG +'deg)';_x000D_
  line.style["-moz-transform"] = 'rotate('+ ANG +'deg)';_x000D_
  line.style["-ms-transform"] = 'rotate('+ ANG +'deg)';_x000D_
  line.style["-o-transform"] = 'rotate('+ ANG +'deg)';_x000D_
  line.style["-transform"] = 'rotate('+ ANG +'deg)';_x000D_
  line.style.top    = top+'px';_x000D_
  line.style.left   = left+'px';_x000D_
  line.style.height = H + 'px';_x000D_
}_x000D_
adjustLine(_x000D_
  document.getElementById('div1'), _x000D_
  document.getElementById('div2'),_x000D_
  document.getElementById('line')_x000D_
);

_x000D_

#content{_x000D_
  position:relative;_x000D_
}_x000D_
.mydiv{_x000D_
  border:1px solid #368ABB;_x000D_
  background-color:#43A4DC;_x000D_
  position:absolute;_x000D_
}_x000D_
.mydiv:after{_x000D_
  content:no-close-quote;_x000D_
  position:absolute;_x000D_
  top:50%;_x000D_
  left:50%;_x000D_
  background-color:black;_x000D_
  width:4px;_x000D_
  height:4px;_x000D_
  border-radius:50%;_x000D_
  margin-left:-2px;_x000D_
  margin-top:-2px;_x000D_
}_x000D_
#div1{_x000D_
  left:200px;_x000D_
  top:200px;_x000D_
  width:50px;_x000D_
  height:50px;_x000D_
}_x000D_
#div2{_x000D_
  left:20px;_x000D_
  top:20px;_x000D_
  width:50px;_x000D_
  height:40px;_x000D_
}_x000D_
#line{_x000D_
  position:absolute;_x000D_
  width:1px;_x000D_
  background-color:red;_x000D_
}

_x000D_

  _x000D_
_x000D_
<div id="content">_x000D_
  <div id="div1" class="mydiv"></div>_x000D_
  <div id="div2" class="mydiv"></div>_x000D_
  <div id="line"></div>_x000D_
</div>_x000D_

_x000D_

What's the Linq to SQL equivalent to TOP or LIMIT/OFFSET?

I had to use Take(n) method, then transform to list, Worked like a charm:

    var listTest = (from x in table1
                     join y in table2
                     on x.field1 equals y.field1
                     orderby x.id descending
                     select new tempList()
                     {
                         field1 = y.field1,
                         active = x.active
                     }).Take(10).ToList();

Shift column in pandas dataframe up by one?

To easily shift by 5 values for example and also get rid of the NaN rows, without having to keep track of the number of values you shifted by:

d['gdp'] = df['gdp'].shift(-5)
df = df.dropna()

_tkinter.TclError: no display name and no $DISPLAY environment variable

I want to add an answer here that noone has explicitly stated with implementation.

This is a great resource to refer to for this failure: https://matplotlib.org/faq/usage_faq.html

In my case, using matplotlib.use did not work because it was somehow already set somewhere else. However, I was able to get beyond the error by defining an environment variable:

export MPLBACKEND=Agg

This takes care of the issue.

My error was in a CircleCI flow specifically, and this resolved the failing tests. One wierd thing was, my tests would pass when run using pytest, however would fail when using parallelism along with circleci tests split feature. However, declaring this env variable resolved the issue.

Why use 'git rm' to remove a file instead of 'rm'?

Removing files using rm is not a problem per se, but if you then want to commit that the file was removed, you will have to do a git rm anyway, so you might as well do it that way right off the bat.

Also, depending on your shell, doing git rm after having deleted the file, you will not get tab-completion so you'll have to spell out the path yourself, whereas if you git rm while the file still exists, tab completion will work as normal.

check all socket opened in linux OS

/proc/net/tcp -a list of open tcp sockets

/proc/net/udp -a list of open udp sockets

/proc/net/raw -a list all the 'raw' sockets

These are the files, use cat command to view them. For example:

cat /proc/net/tcp

You can also use the lsof command.

lsof is a command meaning "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them.

Can't ping a local VM from the host

I had the same issue. Fixed it by adding a static route on my host to my VM via the VMnet8 adapter:

route ADD VM_addr MASK 255.255.255.255 VMnet8_addr

As previously mentioned, you need a bridged connection.

sql like operator to get the numbers only

You can try this

ISNUMERIC (Transact-SQL)

ISNUMERIC returns 1 when the input expression evaluates to a valid numeric data type; otherwise it returns 0.

DECLARE @Table TABLE(
        Col VARCHAR(50)
)

INSERT INTO @Table SELECT 'ABC' 
INSERT INTO @Table SELECT 'Italy' 
INSERT INTO @Table SELECT 'Apple' 
INSERT INTO @Table SELECT '234.62' 
INSERT INTO @Table SELECT '2:234:43:22' 
INSERT INTO @Table SELECT 'France' 
INSERT INTO @Table SELECT '6435.23'
INSERT INTO @Table SELECT '2' 
INSERT INTO @Table SELECT 'Lions'

SELECT  *
FROM    @Table
WHERE   ISNUMERIC(Col) = 1

How to make remote REST call inside Node.js? any CURL?

Look at http://isolasoftware.it/2012/05/28/call-rest-api-with-node-js/

var https = require('https');

/**
 * HOW TO Make an HTTP Call - GET
 */
// options for GET
var optionsget = {
    host : 'graph.facebook.com', // here only the domain name
    // (no http/https !)
    port : 443,
    path : '/youscada', // the rest of the url with parameters if needed
    method : 'GET' // do GET
};

console.info('Options prepared:');
console.info(optionsget);
console.info('Do the GET call');

// do the GET request
var reqGet = https.request(optionsget, function(res) {
    console.log("statusCode: ", res.statusCode);
    // uncomment it for header details
//  console.log("headers: ", res.headers);


    res.on('data', function(d) {
        console.info('GET result:\n');
        process.stdout.write(d);
        console.info('\n\nCall completed');
    });

});

reqGet.end();
reqGet.on('error', function(e) {
    console.error(e);
});

/**
 * HOW TO Make an HTTP Call - POST
 */
// do a POST request
// create the JSON object
jsonObject = JSON.stringify({
    "message" : "The web of things is approaching, let do some tests to be ready!",
    "name" : "Test message posted with node.js",
    "caption" : "Some tests with node.js",
    "link" : "http://www.youscada.com",
    "description" : "this is a description",
    "picture" : "http://youscada.com/wp-content/uploads/2012/05/logo2.png",
    "actions" : [ {
        "name" : "youSCADA",
        "link" : "http://www.youscada.com"
    } ]
});

// prepare the header
var postheaders = {
    'Content-Type' : 'application/json',
    'Content-Length' : Buffer.byteLength(jsonObject, 'utf8')
};

// the post options
var optionspost = {
    host : 'graph.facebook.com',
    port : 443,
    path : '/youscada/feed?access_token=your_api_key',
    method : 'POST',
    headers : postheaders
};

console.info('Options prepared:');
console.info(optionspost);
console.info('Do the POST call');

// do the POST call
var reqPost = https.request(optionspost, function(res) {
    console.log("statusCode: ", res.statusCode);
    // uncomment it for header details
//  console.log("headers: ", res.headers);

    res.on('data', function(d) {
        console.info('POST result:\n');
        process.stdout.write(d);
        console.info('\n\nPOST completed');
    });
});

// write the json data
reqPost.write(jsonObject);
reqPost.end();
reqPost.on('error', function(e) {
    console.error(e);
});

/**
 * Get Message - GET
 */
// options for GET
var optionsgetmsg = {
    host : 'graph.facebook.com', // here only the domain name
    // (no http/https !)
    port : 443,
    path : '/youscada/feed?access_token=you_api_key', // the rest of the url with parameters if needed
    method : 'GET' // do GET
};

console.info('Options prepared:');
console.info(optionsgetmsg);
console.info('Do the GET call');

// do the GET request
var reqGet = https.request(optionsgetmsg, function(res) {
    console.log("statusCode: ", res.statusCode);
    // uncomment it for header details
//  console.log("headers: ", res.headers);


    res.on('data', function(d) {
        console.info('GET result after POST:\n');
        process.stdout.write(d);
        console.info('\n\nCall completed');
    });

});

reqGet.end();
reqGet.on('error', function(e) {
    console.error(e);
});

System.Runtime.InteropServices.COMException (0x800A03EC)

It 'a permission problem when IIS is running I had this problem and I solved it in this way

I went on folders

C:\Windows\ System32\config\SystemProfile

and

C:\Windows\SysWOW64\config\SystemProfile

are protected system folders, they usually have the lock.

Right-click-> Card security-> Click on Edit-> Add untente "Autenticadet User" and assign permissions.

At this point everything is solved, if you still have problems try to give all permissions to "Everyone"

How to select a CRAN mirror in R

Repository selection screen cannot be shown on your system (OS X), since OS X no longer includes X11. R tries to show you the prompt through X11. Install X11 from http://xquartz.macosforge.org/landing/. Then run the install command. The repo selection prompt will be shown.

How can I get a list of all functions stored in the database of a particular schema in PostgreSQL?

If any one is interested here is what query is executed by psql on postgres 9.1:

SELECT n.nspname as "Schema",
  p.proname as "Name",
  pg_catalog.pg_get_function_result(p.oid) as "Result data type",
  pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types",
 CASE
  WHEN p.proisagg THEN 'agg'
  WHEN p.proiswindow THEN 'window'
  WHEN p.prorettype = 'pg_catalog.trigger'::pg_catalog.regtype THEN 'trigger'
  ELSE 'normal'
 END as "Type"
FROM pg_catalog.pg_proc p
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE pg_catalog.pg_function_is_visible(p.oid)
      AND n.nspname <> 'pg_catalog'
      AND n.nspname <> 'information_schema'
ORDER BY 1, 2, 4;

You can get what psql runs for a backslash command by running psql with the -E flag.

How does cookie based authentication work?

A cookie is basically just an item in a dictionary. Each item has a key and a value. For authentication, the key could be something like 'username' and the value would be the username. Each time you make a request to a website, your browser will include the cookies in the request, and the host server will check the cookies. So authentication can be done automatically like that.

To set a cookie, you just have to add it to the response the server sends back after requests. The browser will then add the cookie upon receiving the response.

There are different options you can configure for the cookie server side, like expiration times or encryption. An encrypted cookie is often referred to as a signed cookie. Basically the server encrypts the key and value in the dictionary item, so only the server can make use of the information. So then cookie would be secure.

A browser will save the cookies set by the server. In the HTTP header of every request the browser makes to that server, it will add the cookies. It will only add cookies for the domains that set them. Example.com can set a cookie and also add options in the HTTP header for the browsers to send the cookie back to subdomains, like sub.example.com. It would be unacceptable for a browser to ever sends cookies to a different domain.

Using wget to recursively fetch a directory with arbitrary files in it

Recursive wget ignoring robots (for websites)

wget -e robots=off -r -np --page-requisites --convert-links 'http://example.com/folder/'

-e robots=off causes it to ignore robots.txt for that domain

-r makes it recursive

-np = no parents, so it doesn't follow links up to the parent folder

Understanding [TCP ACKed unseen segment] [TCP Previous segment not captured]

That very well may be a false positive. Like the warning message says, it is common for a capture to start in the middle of a tcp session. In those cases it does not have that information. If you are really missing acks then it is time to start looking upstream from your host for where they are disappearing. It is possible that tshark can not keep up with the data and so it is dropping some metrics. At the end of your capture it will tell you if the "kernel dropped packet" and how many. By default tshark disables dns lookup, tcpdump does not. If you use tcpdump you need to pass in the "-n" switch. If you are having a disk IO issue then you can do something like write to memory /dev/shm. BUT be careful because if your captures get very large then you can cause your machine to start swapping.

My bet is that you have some very long running tcp sessions and when you start your capture you are simply missing some parts of the tcp session due to that. Having said that, here are some of the things that I have seen cause duplicate/missing acks.

Switches - (very unlikely but sometimes they get in a sick state)
Routers - more likely than switches, but not much
Firewall - More likely than routers. Things to look for here are resource exhaustion (license, cpu, etc)
Client side filtering software - antivirus, malware detection etc.

How to fix: "UnicodeDecodeError: 'ascii' codec can't decode byte"

I experienced this error with Python2.7. It happened to me while trying to run many python programs, but I managed to reproduce it with this simple script:

#!/usr/bin/env python

import subprocess
import sys

result = subprocess.Popen([u'svn', u'info'])
if not callable(getattr(result, "__enter__", None)) and not callable(getattr(result, "__exit__", None)):
    print("foo")
print("bar")

On success, it should print out 'foo' and 'bar', and probably an error message if you're not in a svn folder.

On failure, it should print 'UnicodeDecodeError: 'ascii' codec can't decode byte 0xc4 in position 39: ordinal not in range(128)'.

After trying to regenerate my locales and many other solutions posted in this question, I learned the error was happening because I had a special character (l) encoded in my PATH environment variable. After fixing the PATH in '~/.bashrc', and exiting my session and entering again, (apparently sourcing '~/.bashrc' didn't work), the issue was gone.

PHP Composer behind http proxy

on Windows insert:

set http_proxy=<proxy>
set https_proxy=<proxy>

before

php "%~dp0composer.phar" %*

or on Linux insert:

export http_proxy=<proxy>
export https_proxy=<proxy>

before

php "${dir}/composer.phar" "$@"

What does "Table does not support optimize, doing recreate + analyze instead" mean?

That's really an informational message.

Likely, you're doing OPTIMIZE on an InnoDB table (table using the InnoDB storage engine, rather than the MyISAM storage engine).

InnoDB doesn't support the OPTIMIZE the way MyISAM does. It does something different. It creates an empty table, and copies all of the rows from the existing table into it, and essentially deletes the old table and renames the new table, and then runs an ANALYZE to gather statistics. That's the closest that InnoDB can get to doing an OPTIMIZE.

The message you are getting is basically MySQL server repeating what the InnoDB storage engine told MySQL server:

Table does not support optimize is the InnoDB storage engine saying...

"I (the InnoDB storage engine) don't do an OPTIMIZE operation like my friend (the MyISAM storage engine) does."

"doing recreate + analyze instead" is the InnoDB storage engine saying...

"I have decided to perform a different set of operations which will achieve an equivalent result."

Is it not possible to define multiple constructors in Python?

Unlike Java, you cannot define multiple constructors. However, you can define a default value if one is not passed.

def __init__(self, city="Berlin"):
  self.city = city

7-Zip command to create and extract a password-protected ZIP file on Windows?

From http://www.dotnetperls.com:

7z a secure.7z * -pSECRET

Where:

7z        : name and path of 7-Zip executable
a         : add to archive
secure.7z : name of destination archive
*         : add all files from current directory to destination archive
-pSECRET  : specify the password "SECRET"

To open :

7z x secure.7z

Then provide the SECRET password

Note: If the password contains spaces or special characters, then enclose it with single quotes

7z a secure.7z * -p"pa$$word @|"

Laravel 5.4 ‘cross-env’ Is Not Recognized as an Internal or External Command

I think this log entry Local package.json exists, but node_modules missing, did you mean to install? has gave me the solution.

npm install && npm run dev

Can't find bundle for base name

java.util.MissingResourceException: Can't find bundle for base name
    org.jfree.chart.LocalizationBundle, locale en_US

To the point, the exception message tells in detail that you need to have either of the following files in the classpath:

/org/jfree/chart/LocalizationBundle.properties

/org/jfree/chart/LocalizationBundle_en.properties

/org/jfree/chart/LocalizationBundle_en_US.properties

Also see the official Java tutorial about resourcebundles for more information.

But as this is actually a 3rd party managed properties file, you shouldn't create one yourself. It should be already available in the JFreeChart JAR file. So ensure that you have it available in the classpath during runtime. Also ensure that you're using the right version, the location of the propertiesfile inside the package tree might have changed per JFreeChart version.

When executing a JAR file, you can use the -cp argument to specify the classpath. E.g.:

java -jar -cp c:/path/to/jfreechart.jar yourfile.jar

Alternatively you can specify the classpath as class-path entry in the JAR's manifest file. You can use in there relative paths which are relative to the JAR file itself. Do not use the %CLASSPATH% environment variable, it's ignored by JAR's and everything else which aren't executed with java.exe without -cp, -classpath and -jar arguments.

Draw a curve with css

@Navaneeth and @Antfish, no need to transform you can do like this also because in above solution only top border is visible so for inside curve you can use bottom border.

_x000D_

.box {_x000D_
  width: 500px;_x000D_
  height: 100px;_x000D_
  border: solid 5px #000;_x000D_
  border-color: transparent transparent #000 transparent;_x000D_
  border-radius: 0 0 240px 50%/60px;_x000D_
}

_x000D_

<div class="box"></div>

_x000D_

jQuery remove options from select

if your dropdown is in a table and you do not have id for it then you can use the following jquery:

var select_object = purchasing_table.rows[row_index].cells[cell_index].childNodes[1];
$(select_object).find('option[value='+site_name+']').remove();

Git push hangs when pushing to Github?

Had the same problem. Was a little bit confused but the thing was I had make a git init --bare on root, that means that you won't be able to push because of you don't have any rights. Instead make a new User or in my case I used Pi User and made git init --bare there, which then later on it worked.
git config --global http.postBuffer 524288000

Maximum size in bytes of the buffer used by smart HTTP transports when POSTing data to the remote system. For requests larger than this buffer size, HTTP/1.1 and Transfer-Encoding: chunked is used to avoid creating a massive pack file locally. Default is 1 MiB, which is sufficient for most requests.

How do I set proxy for chrome in python webdriver?

This worked for me like a charm:

proxy = "localhost:8080"
desired_capabilities = webdriver.DesiredCapabilities.CHROME.copy()
desired_capabilities['proxy'] = {
    "httpProxy": proxy,
    "ftpProxy": proxy,
    "sslProxy": proxy,
    "noProxy": None,
    "proxyType": "MANUAL",
    "class": "org.openqa.selenium.Proxy",
    "autodetect": False
}

How to use HTTP_X_FORWARDED_FOR properly?

I like Hrishikesh's answer, to which I only have this to add...because we saw a comma-delimited string coming across when multiple proxies along the way were used, we found it necessary to add an explode and grab the final value, like this:

$IParray=array_values(array_filter(explode(',',$_SERVER['HTTP_X_FORWARDED_FOR'])));
return end($IParray);

the array_filter is in there to remove empty entries.

How to prevent errno 32 broken pipe?

The broken pipe error usually occurs if your request is blocked or takes too long and after request-side timeout, it'll close the connection and then, when the respond-side (server) tries to write to the socket, it will throw a pipe broken error.

Online code beautifier and formatter

You can use Perl::Tidy for Perl.

How do I create sql query for searching partial matches?

First of all, this approach won't scale in the large, you'll need a separate index from words to item (like an inverted index).

If your data is not large, you can do

SELECT DISTINCT(name) FROM mytable WHERE name LIKE '%mall%' OR description LIKE '%mall%'

using OR if you have multiple keywords.

How to loop through a JSON object with typescript (Angular2)

Assuming your json object from your GET request looks like the one you posted above simply do:

let list: string[] = [];

json.Results.forEach(element => {
    list.push(element.Id);
});

Or am I missing something that prevents you from doing it this way?

CMD what does /im (taskkill)?

If you type the executable name and a /? switch at the command line, there is typically help information available. Doing so with taskkill /? provides the following, for instance:

TASKKILL [/S system [/U username [/P [password]]]]
         { [/FI filter] [/PID processid | /IM imagename] } [/T] [/F]

Description:
    This tool is used to terminate tasks by process id (PID) or image name.

Parameter List:
    /S    system           Specifies the remote system to connect to.

    /U    [domain\]user    Specifies the user context under which the
                           command should execute.

    /P    [password]       Specifies the password for the given user
                           context. Prompts for input if omitted.

    /FI   filter           Applies a filter to select a set of tasks.
                           Allows "*" to be used. ex. imagename eq acme*

    /PID  processid        Specifies the PID of the process to be terminated.
                           Use TaskList to get the PID.

    /IM   imagename        Specifies the image name of the process
                           to be terminated. Wildcard '*' can be used
                           to specify all tasks or image names.

    /T                     Terminates the specified process and any
                           child processes which were started by it.

    /F                     Specifies to forcefully terminate the process(es).

    /?                     Displays this help message.

Filters:
    Filter Name   Valid Operators           Valid Value(s)
    -----------   ---------------           -------------------------
    STATUS        eq, ne                    RUNNING |
                                            NOT RESPONDING | UNKNOWN
    IMAGENAME     eq, ne                    Image name
    PID           eq, ne, gt, lt, ge, le    PID value
    SESSION       eq, ne, gt, lt, ge, le    Session number.
    CPUTIME       eq, ne, gt, lt, ge, le    CPU time in the format
                                            of hh:mm:ss.
                                            hh - hours,
                                            mm - minutes, ss - seconds
    MEMUSAGE      eq, ne, gt, lt, ge, le    Memory usage in KB
    USERNAME      eq, ne                    User name in [domain\]user
                                            format
    MODULES       eq, ne                    DLL name
    SERVICES      eq, ne                    Service name
    WINDOWTITLE   eq, ne                    Window title

    NOTE
    ----
    1) Wildcard '*' for /IM switch is accepted only when a filter is applied.
    2) Termination of remote processes will always be done forcefully (/F).
    3) "WINDOWTITLE" and "STATUS" filters are not considered when a remote
       machine is specified.

Examples:
    TASKKILL /IM notepad.exe
    TASKKILL /PID 1230 /PID 1241 /PID 1253 /T
    TASKKILL /F /IM cmd.exe /T 
    TASKKILL /F /FI "PID ge 1000" /FI "WINDOWTITLE ne untitle*"
    TASKKILL /F /FI "USERNAME eq NT AUTHORITY\SYSTEM" /IM notepad.exe
    TASKKILL /S system /U domain\username /FI "USERNAME ne NT*" /IM *
    TASKKILL /S system /U username /P password /FI "IMAGENAME eq note*"

You can also find this information, as well as documentation for most of the other command-line utilities, in the Microsoft TechNet Command-Line Reference

How to unpack and pack pkg file?

Here is a bash script inspired by abarnert's answer which will unpack a package named MyPackage.pkg into a subfolder named MyPackage_pkg and then open the folder in Finder.

    #!/usr/bin/env bash
    filename="$*"
    dirname="${filename/\./_}"
    pkgutil --expand "$filename" "$dirname"
    cd "$dirname"
    tar xvf Payload
    open .

Usage:

    pkg-upack.sh MyPackage.pkg

Warning: This will not work in all cases, and will fail with certain files, e.g. the PKGs inside the OSX system installer. If you want to peek inside the pkg file and see what's inside, you can try SuspiciousPackage (free app), and if you need more options such as selectively unpacking specific files, then have a look at Pacifist (nagware).

Reload activity in Android

simply use

this.recreate();

this will trigger the onCreate method in the activity

What is `related_name` used for in Django?

The related_name argument is also useful if you have more complex related class names. For example, if you have a foreign key relationship:

class UserMapDataFrame(models.Model):
    user = models.ForeignKey(User)

In order to access UserMapDataFrame objects from the related User, the default call would be User.usermapdataframe_set.all(), which it is quite difficult to read.

Using the related_name allows you to specify a simpler or more legible name to get the reverse relation. In this case, if you specify user = models.ForeignKey(User, related_name='map_data'), the call would then be User.map_data.all().

What is "stdafx.h" used for in Visual Studio?

"Stdafx.h" is a precompiled header.It include file for standard system include files and for project-specific include files that are used frequently but are changed infrequently.which reduces compile time and Unnecessary Processing.

Precompiled Header stdafx.h is basically used in Microsoft Visual Studio to let the compiler know the files that are once compiled and no need to compile it from scratch. You can read more about it

http://www.cplusplus.com/articles/1TUq5Di1/

https://docs.microsoft.com/en-us/cpp/ide/precompiled-header-files?view=vs-2017

Can you remove elements from a std::list while iterating through it?

You have to increment the iterator first (with i++) and then remove the previous element (e.g., by using the returned value from i++). You can change the code to a while loop like so:

std::list<item*>::iterator i = items.begin();
while (i != items.end())
{
    bool isActive = (*i)->update();
    if (!isActive)
    {
        items.erase(i++);  // alternatively, i = items.erase(i);
    }
    else
    {
        other_code_involving(*i);
        ++i;
    }
}

Java regex capturing groups indexes

Parenthesis () are used to enable grouping of regex phrases.

The group(1) contains the string that is between parenthesis (.*) so .* in this case

And group(0) contains whole matched string.

If you would have more groups (read (...) ) it would be put into groups with next indexes (2, 3 and so on).

How to use 'git pull' from the command line?

Try setting the HOME environment variable in Windows to your home folder (c:\users\username).

( you can confirm that this is the problem by doing echo $HOME in git bash and echo %HOME% in cmd - latter might not be available )

How to break out of while loop in Python?

Walrus operator (assignment expressions added to python 3.8) and while-loop-else-clause can do it more pythonic:

myScore = 0
while ans := input("Roll...").lower() == "r":
    # ... do something
else:
    print("Now I'll see if I can break your score...")

Getting value of select (dropdown) before change

I'd like to contribute another option to solve this issue; since the solutions proposed above did not solve my scenario.

(function()
    {
      // Initialize the previous-attribute
      var selects = $('select');
      selects.data('previous', selects.val());

      // Listen on the body for changes to selects
      $('body').on('change', 'select',
        function()
        {
          $(this).data('previous', $(this).val());
        }
      );
    }
)();

This does use jQuery so that def. is a dependency here, but this can be adapted to work in pure javascript. (Add a listener to the body, check if the original target was a select, execute function, ...).

By attaching the change listener to the body, you can pretty much be sure this will fire after specific listeners for the selects, otherwise the value of 'data-previous' will be overwritten before you can even read it.

This is of course assuming that you prefer to use separate listeners for your set-previous and check-value. It fits right in with the single-responsibility pattern.

Note: This adds this 'previous' functionality to all selects, so be sure to fine-tune the selectors if needed.

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

I was also having the same problem. I tried the following and it's working for me now:
Please try the following steps:

Go to..

File > Settings > Appearance & Behavior > System Settings > HTTP Proxy [Under IDE Settings] Enable following option Auto-detect proxy settings

On Mac it's under:

Android Studio > Preferences > Appearance & Behaviour... etc

you can also use the test connection button and check with google.com to see if it works or not.

How can I install MacVim on OS X?

Step 1. Install homebrew from here: http://brew.sh
Step 1.1. Run export PATH=/usr/local/bin:$PATH
Step 2. Run brew update
Step 3. Run brew install vim && brew install macvim
Step 4. Run brew link macvim

You now have the latest versions of vim and macvim managed by brew. Run brew update && brew upgrade every once in a while to upgrade them.

This includes the installation of the CLI mvim and the mac application (which both point to the same thing).

I use this setup and it works like a charm. Brew even takes care of installing vim with the preferable options.

Auto insert date and time in form input field?

<input type="date" id="myDate"  />

<script type="text/javascript">
function SetDate()
{
var date = new Date();

var day = date.getDate();
var month = date.getMonth() + 1;
var year = date.getFullYear();

if (month < 10) month = "0" + month;
if (day < 10) day = "0" + day;

var today = year + "-" + month + "-" + day;


document.getElementById('myDate').value = today;
}
</script>

<body onload="SetDate();">

found here: http://jsbin.com/oqekar/1/edit?html,js,output

Batch file script to zip files

No external dependency on 7zip or ZIP - create a vbs script and execute:

    @ECHO Zipping
    mkdir %TEMPDIR%
    xcopy /y /s %FILETOZIP% %TEMPDIR%
    echo Set objArgs = WScript.Arguments > _zipIt.vbs
    echo InputFolder = objArgs(0) >> _zipIt.vbs
    echo ZipFile = objArgs(1) >> _zipIt.vbs
    echo CreateObject("Scripting.FileSystemObject").CreateTextFile(ZipFile, True).Write "PK" ^& Chr(5) ^& Chr(6) ^& String(18, vbNullChar) >> _zipIt.vbs
    echo Set objShell = CreateObject("Shell.Application") >> _zipIt.vbs
    echo Set source = objShell.NameSpace(InputFolder).Items >> _zipIt.vbs
    echo objShell.NameSpace(ZipFile).CopyHere(source) >> _zipIt.vbs
    @ECHO *******************************************
    @ECHO Zipping, please wait..
    echo wScript.Sleep 12000 >> _zipIt.vbs
    CScript  _zipIt.vbs  %TEMPDIR%  %OUTPUTZIP%
    del _zipIt.vbs
    rmdir /s /q  %TEMPDIR%

    @ECHO *******************************************
    @ECHO      ZIP Completed

Auto-fit TextView for Android

Quick fix for the issue described by @Malachiasz

I've fixed the issue by adding custom support for this in the auto resize class:

public void setTextCompat(final CharSequence text) {
    setTextCompat(text, BufferType.NORMAL);
}

public void setTextCompat(final CharSequence text, BufferType type) {
    // Quick fix for Android Honeycomb and Ice Cream Sandwich which sets the text only on the first call
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1 &&
        Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
        super.setText(DOUBLE_BYTE_WORDJOINER + text + DOUBLE_BYTE_WORDJOINER, type);
    } else {
        super.setText(text, type);
    }
}

@Override
public CharSequence getText() {
    String originalText = super.getText().toString();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1 &&
        Build.VERSION.SDK_INT <= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
        // We try to remove the word joiners we added using compat method - if none found - this will do nothing.
        return originalText.replaceAll(DOUBLE_BYTE_WORDJOINER, "");
    } else {
        return originalText;
    }
}

Just call yourView.setTextCompat(newTextValue) instead of yourView.setText(newTextValue)

How to allow http content within an iframe on a https site

You could try scraping whatever you need with PHP or another server side language, then put the iframe to the scraped content. Here's an example with PHP:

scrapedcontent.php:

<?php
$homepage = file_get_contents('http://www.example.com/');
echo $homepage;
?>

index.html:

<iframe src="scrapedcontent.php"></iframe>

CSS media query to target only iOS devices

As mentioned above, the short answer is no. But I'm in need of something similar in the app I'm working on now, yet the areas where the CSS needs to be different are limited to very specific areas of a page.

If you're like me and don't need to serve up an entirely different stylesheet, another option would be to detect a device running iOS in the way described in this question's selected answer: Detect if device is iOS

Once you've detected the iOS device you could add a class to the area you're targeting using Javascript (eg. the document.getElementsByTagName("yourElementHere")[0].setAttribute("class", "iOS-device");, jQuery, PHP or whatever, and style that class accordingly using the pre-existing stylesheet.

.iOS-device {
      style-you-want-to-set: yada;
}

Display Two <div>s Side-by-Side

Try to Use Flex as that is the new standard of html5.

http://jsfiddle.net/maxspan/1b431hxm/

<div id="row1">
    <div id="column1">I am column one</div>
    <div id="column2">I am column two</div>
</div>

#row1{
    display:flex;
    flex-direction:row;
justify-content: space-around;
}

#column1{
    display:flex;
    flex-direction:column;

}


#column2{
    display:flex;
    flex-direction:column;
}

How do I make a branch point at a specific commit?

If you are currently not on branch master, that's super easy:

git branch -f master 1258f0d0aae

This does exactly what you want: It points master at the given commit, and does nothing else.

If you are currently on master, you need to get into detached head state first. I'd recommend the following two command sequence:

git checkout 1258f0d0aae    #detach from master
git branch -f master HEAD   #exactly as above

#optionally reattach to master
git checkout master

Be aware, though, that any explicit manipulation of where a branch points has the potential to leave behind commits that are no longer reachable by any branches, and thus become object to garbage collection. So, think before you type git branch -f!

This method is better than the git reset --hard approach, as it does not destroy anything in the index or working directory.

Laravel blank white screen

in my case, the BLANK WHITE SCREEN issue was as simple as a typo or wrong character on the env file. I was implementing socialite, so when I was setting up the .env credentials for Google+ like this:

G+_CLIENT_ID = Your G+ Client ID
G+_CLIENT_SECRET = Your G+ Client secret
G+_REDIRECT = 'http://localhost:8000/callback/google'

But, the .env file can't use the '+' sign, so I have to make this correction:

GOOGLE_CLIENT_ID = Your G+ Client ID
GOOGLE_CLIENT_SECRET = Your G+ Client secret
GOOGLE_REDIRECT = 'http://localhost:8000/callback/google'

I hope this help you find a dumb error...

Still Reachable Leak detected by Valgrind

Here is a proper explanation of "still reachable":

"Still reachable" are leaks assigned to global and static-local variables. Because valgrind tracks global and static variables it can exclude memory allocations that are assigned "once-and-forget". A global variable assigned an allocation once and never reassigned that allocation is typically not a "leak" in the sense that it does not grow indefinitely. It is still a leak in the strict sense, but can usually be ignored unless you are pedantic.

Local variables that are assigned allocations and not free'd are almost always leaks.

Here is an example

int foo(void)
{
    static char *working_buf = NULL;
    char *temp_buf;
    if (!working_buf) {
         working_buf = (char *) malloc(16 * 1024);
    }
    temp_buf = (char *) malloc(5 * 1024);

    ....
    ....
    ....

}

Valgrind will report working_buf as "still reachable - 16k" and temp_buf as "definitely lost - 5k".

PHP display image BLOB from MySQL

This is what I use to display images from blob:

echo '<img src="data:image/jpeg;base64,'.base64_encode($image->load()) .'" />';

Beginner Python Practice?

UPDATE (Jan 2020): There are many great online places to get beginner practice at Python, some which are highly engaging and/or otherwise interactive. These sites are generally more practical than the Python Challenge (http://pythonchallenge.com), which you can tackle later. (After years of experience, you can try the Python "wat" quiz). For now, it's most important to learn, practice, and have fun. Welcome to Python!

http://codecombat.com (gamified learning, nice graphics)
http://codecademy.com/catalog/language/python (choice of topics)
http://codingbat.com/python (very lightweight, older; good for slow internet)
http://pythontutor.com (intermediate; learn how Python works internally)
http://learnpython.org (lightweight but modern)
http://pyschools.com (Udemy; also lightweight but modern)

ps. BTW (by the way), your experience puts you right in the heart of the target audience of my Python book, Core Python Programming. That audience is those who know how to code in another high-level language but want to learn Python as quickly but as in-depth as possible. Reviews, philosophy, and other info at http://corepython.com

pps. The following resources were previously on the list but are no longer available.

http://singpath.appspot.com and http://singpath.com (currently down)
http://learnstreet.com/lessons/study/python (defunct as of Jul 2014; see post)

How to generate a create table script for an existing table in phpmyadmin?

Export whole database select format as SQL. Now, open that SQL file which you have downloaded using notepad, notepad++ or any editor. You will see all the tables and insert queries of your database. All scripts will be available there.

Concatenate String in String Objective-c

simple one:

[[@"first" stringByAppendingString:@"second"] stringByAppendingString:@"third"];

if you have many STRINGS to Concatenate, you should use NSMutableString for better performance

$this->session->set_flashdata() and then $this->session->flashdata() doesn't work in codeigniter

Well, the documentation does actually state that

CodeIgniter supports "flashdata", or session data that will only be available for the next server request, and are then automatically cleared.

as the very first thing, which obviusly means that you need to do a new server request. A redirect, a refresh, a link or some other mean to send the user to the next request.

Why use flashdata if you are using it in the same request, anyway? You'd might as well not use flashdata or use a regular session.

Matplotlib plots: removing axis, legends and white spaces

What is the equivalent of Select Case in Access SQL?

You can use IIF for a similar result.

Note that you can nest the IIF statements to handle multiple cases. There is an example here: http://forums.devshed.com/database-management-46/query-ms-access-iif-statement-multiple-conditions-358130.html

SELECT IIf([Combinaison] = "Mike", 12, IIf([Combinaison] = "Steve", 13)) As Answer 
FROM MyTable;

How to call a Python function from Node.js

The python-shell module by extrabacon is a simple way to run Python scripts from Node.js with basic, but efficient inter-process communication and better error handling.

Installation: npm install python-shell.

Running a simple Python script:

var PythonShell = require('python-shell');

PythonShell.run('my_script.py', function (err) {
  if (err) throw err;
  console.log('finished');
});

Running a Python script with arguments and options:

var PythonShell = require('python-shell');

var options = {
  mode: 'text',
  pythonPath: 'path/to/python',
  pythonOptions: ['-u'],
  scriptPath: 'path/to/my/scripts',
  args: ['value1', 'value2', 'value3']
};

PythonShell.run('my_script.py', options, function (err, results) {
  if (err) 
    throw err;
  // Results is an array consisting of messages collected during execution
  console.log('results: %j', results);
});

For the full documentation and source code, check out https://github.com/extrabacon/python-shell

JSON array javascript

C#: How to make pressing enter in a text box trigger a button, yet still allow shortcuts such as "Ctrl+A" to get through?

Can you not use AcceptButton in for the Forms Properties Window? This sets the default behaviour for the Enter key press, but you are still able to use other shortcuts.

PHP form - on submit stay on same page

You can use the # action in a form action:

<?php
    if(isset($_POST['SubmitButton'])){ // Check if form was submitted

        $input = $_POST['inputText']; // Get input text
        $message = "Success! You entered: " . $input;
    }
?>

<html>
    <body>
        <form action="#" method="post">
            <?php echo $message; ?>
            <input type="text" name="inputText"/>
            <input type="submit" name="SubmitButton"/>
        </form>
    </body>
</html>

How to Get Element By Class in JavaScript?

I'm surprised there are no answers using Regular Expressions. This is pretty much Andrew's answer, using RegExp.test instead of String.indexOf, since it seems to perform better for multiple operations, according to jsPerf tests.
It also seems to be supported on IE6.

function replaceContentInContainer(matchClass, content) {
    var re = new RegExp("(?:^|\\s)" + matchClass + "(?!\\S)"),
        elems = document.getElementsByTagName('*'), i;
    for (i in elems) {
        if (re.test(elems[i].className)) {
            elems[i].innerHTML = content;
        }
    }
}

replaceContentInContainer("box", "This is the replacement text.");

If you look for the same class(es) frequently, you can further improve it by storing the (precompiled) regular expressions elsewhere, and passing them directly to the function, instead of a string.

function replaceContentInContainer(reClass, content) {
    var elems = document.getElementsByTagName('*'), i;
    for (i in elems) {
        if (reClass.test(elems[i].className)) {
            elems[i].innerHTML = content;
        }
    }
}

var reBox = /(?:^|\s)box(?!\S)/;
replaceContentInContainer(reBox, "This is the replacement text.");

Kubernetes pod gets recreated when deleted

When the pod is recreating automatically even after the deletion of the pod manually, then those pods have been created using the Deployment. When you create a deployment, it automatically creates ReplicaSet and Pods. Depending upon how many replicas of your pod you mentioned in the deployment script, it will create those number of pods initially. When you try to delete any pod manually, it will automatically create those pod again.

Yes, sometimes you need to delete the pods with force. But in this case force command doesn’t work.

How to add dll in c# project

Have you added the dll into your project references list? If not right click on the project "References" folder and selecet "Add Reference" then use browse to locate your science.dll, select it and click ok.

edit

I can't see the image of your VS instance that some people are referring to and I note that you now say that it works in Net4.0 and VS2010.

VS2008 projects support NET 3.5 by default. I expect that is the problem as your DLL may be NET 4.0 compliant but not NET 3.5.

Using Pipes within ngModel on INPUT Elements in Angular

I tried the solutions above yet the value that goes to the model were the formatted value then returning and giving me currencyPipe errors. So i had to

  [ngModel]="transfer.amount | currency:'USD':true"
                                   (blur)="addToAmount($event.target.value)"
                                   (keypress)="validateOnlyNumbers($event)"

And on the function of addToAmount -> change on blur cause the ngModelChange was giving me cursor issues.

removeCurrencyPipeFormat(formatedNumber){
    return formatedNumber.replace(/[$,]/g,"")
  }

And removing the other non numeric values.

validateOnlyNumbers(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  var regex = /[0-9]|\./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }

How to make Unicode charset in cmd.exe by default?

After I tried algirdas' solution, my Windows crashed (Win 7 Pro 64bit) so I decided to try a different solution:

Start Run (Win+R)
Type cmd /K chcp 65001

You will get mostly what you want. To start it from the taskbar or anywhere else, make a shortcut (you can name it cmd.unicode.exe or whatever you like) and change its Target to C:\Windows\System32\cmd.exe /K chcp 65001.

Split long commands in multiple lines through Windows batch file

You can break up long lines with the caret ^ as long as you remember that the caret and the newline following it are completely removed. So, if there should be a space where you're breaking the line, include a space. (More on that below.)

Example:

copy file1.txt file2.txt

would be written as:

copy file1.txt^
 file2.txt

Best way to style a TextBox in CSS

You could target all text boxes with input[type=text] and then explicitly define the class for the textboxes who need it.

You can code like below :

_x000D_

input[type=text] {_x000D_
  padding: 0;_x000D_
  height: 30px;_x000D_
  position: relative;_x000D_
  left: 0;_x000D_
  outline: none;_x000D_
  border: 1px solid #cdcdcd;_x000D_
  border-color: rgba(0, 0, 0, .15);_x000D_
  background-color: white;_x000D_
  font-size: 16px;_x000D_
}_x000D_
_x000D_
.advancedSearchTextbox {_x000D_
  width: 526px;_x000D_
  margin-right: -4px;_x000D_
}

_x000D_

<input type="text" class="advancedSearchTextBox" />

_x000D_

Android studio doesn't list my phone under "Choose Device"

That worked for my TP-Link Neffos C5:

The first step in configuring a Windows based development system to connect to an Android device using ADB is to install the appropriate USB drivers on the system. In the case of some devices, the Google USB Driver must be installed (a full listing of devices supported by the Google USB driver can be found online at http://developer.android.com/sdk/win-usb.html).

To install this driver, perform the following steps:

Launch Android Studio and open the Android SDK Manager, either by selected Configure -> SDK Manager from the Welcome screen, or using the Tools -> Android -> SDK Manager menu option when working on an existing project.

Scroll down to the Extras section and check the status of the Google USB Driver package to make sure that it is listed as Installed.

If the driver is not installed, select it and click on the Install packages button to initiate the installation.

Once installation is complete, close the Android SDK Manager.

Complete instructions on http://www.techotopia.com/index.php/Testing_Android_Studio_Apps_on_a_Physical_Android_Device (check "Windows ADB Configuration" section).

I basically updated a lot of stuff and then it worked in both Android Studio and Eclipse!

How to iterate through property names of Javascript object?

In JavaScript 1.8.5, Object.getOwnPropertyNames returns an array of all properties found directly upon a given object.

Object.getOwnPropertyNames ( obj )

and another method Object.keys, which returns an array containing the names of all of the given object's own enumerable properties.

Object.keys( obj )

I used forEach to list values and keys in obj, same as for (var key in obj) ..

Object.keys(obj).forEach(function (key) {
      console.log( key , obj[key] );
});

This all are new features in ECMAScript , the mothods getOwnPropertyNames, keys won't supports old browser's.

Key error when selecting columns in pandas dataframe after read_csv

if you need to select multiple columns from dataframe use 2 pairs of square brackets eg.

df[["product_id","customer_id","store_id"]]

What's the difference between a web site and a web application?

Based on a general research and understanding, "Almost" Everything that can be accessed via a browser is actually called a "Web application" now these days. Even your internet router at home is a web application that uses the HTTP protocol to access the application (i.e the one that "interacts" with you). Yes, there are lots of websites that do "Nothing" except showing you stuff. But the age we are living in, everything operates on the basis of web application. Natwest PLC bank has got a website where you can go and find out things that natwest offer as a consumer/high-street bank. However:

1) You can create your online banking account - Web application 2) View, amend details on your personal stuff - web application 3) Manage money - Web application 4) Deal shares/stocks - Web application

Another good example is Fidelity.com (as quoted in many other examples on the web).

I'm going to have to argue and say that there are two answers:

1) If your purpose is simply to inform your audience with some contents that will never demand any interaction whatsoever, website is your answer. Then it is not a web application.

2) If you are living in the current/modern world i.e. will have a personal site, allow people to see some/all/none of your special stuff, protect yourself from people/bots/etc., web application and websites are no different.

Shell script to check if file exists

You can do it in one line:

ls /home/edward/bank1/fiche/Test* >/dev/null 2>&1 && echo "found one" || echo "found none"

To understand what it does you have to decompose the command and have a basic awareness of boolean logic.

Directly from bash man page:

[...]
expression1 && expression2
     True if both expression1 and expression2 are true.
expression1 || expression2
     True if either expression1 or expression2 is true.
[...]

In the shell (and in general in unix world), the boolean true is a program that exits with status 0.

ls tries to list the pattern, if it succeed (meaning the pattern exists) it exits with status 0, 2 otherwise (have a look at ls man page for details).

In our case there are actually 3 expressions, for the sake of clarity I will put parenthesis, although they are not needed because && has precedence on ||:

 (expression1 && expression2) || expression3

so if expression1 is true (ie: ls found the pattern) it evaluates expression2 (which is just an echo and will exit with status 0). In this case expression3 is never evaluate because what's on the left site of || is already true and it would be a waste of resources trying to evaluate what's on the right.

Otherwise, if expression1 is false, expression2 is not evaluated but in this case expression3 is.

How can I get the current network interface throughput statistics on Linux/UNIX?

dstat - Combines vmstat, iostat, ifstat, netstat information and more
iftop - Amazing network bandwidth utility to analyse what is really happening on your eth
netio - Measures the net throughput of a network via TCP/IP
inq - CLI troubleshooting utility that displays info on storage, typically Symmetrix. By default, INQ returns the device name, Symmetrix ID, Symmetrix LUN, and capacity.
send_arp - Sends out an arp broadcast on the specified network device (defaults to eth0), reporting an old and new IP address mapping to a MAC address.
EtherApe - is a graphical network monitor for Unix modeled after etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically.
iptraf - An IP traffic monitor that shows information on the IP traffic passing over your network.

More details: http://felipeferreira.net/?p=1194

Disable vertical sync for glxgears

The vblank_mode environment variable does the trick. You should then get several hundreds FPS on modern hardware. And you are now able to compare the results with others.

$>   vblank_mode=0 glxgears

What does localhost:8080 mean?

http://localhost:8080/web: localhost ( hostname ) is the machine name or IP address of the host server e.g Glassfish, Tomcat. 8080 ( port ) is the address of the port on which the host server is listening for requests.

http://localhost/web: localhost ( hostname ) is the machine name or IP address of the host server e.g Glassfish, Tomcat. host server listening to default port 80.

MySql: is it possible to 'SUM IF' or to 'COUNT IF'?

From MYSQL I solved the problem like this:

SUM(CASE WHEN used = 1 THEN 1 ELSE 0 END) as amount_one,

Hope this helps :D

Generate a unique id

We can do something like this

string TransactionID = "BTRF"+DateTime.Now.Ticks.ToString().Substring(0, 10);

Programmatically getting the MAC of an Android device

Getting the MAC address through WifiInfo.getMacAddress() won't work on Marshmallow and above, it has been disabled and will return the constant value of 02:00:00:00:00:00.

how to add button click event in android studio

package com.mani.smsdetect;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity implements View.OnClickListener {

    //Declaration Button
    Button btnClickMe;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Intialization Button

        btnClickMe = (Button) findViewById(R.id.btnClickMe);

        btnClickMe.setOnClickListener(MainActivity.this);
        //Here MainActivity.this is a Current Class Reference (context)
    }

    @Override
    public void onClick(View v) {

        //Your Logic
    }
}

SSL Error When installing rubygems, Unable to pull data from 'https://rubygems.org/

Or may be prevented by firewall like me. Try this:

sudo gem install --http-proxy http://localhost:port cocoapods -V

Cannot download Docker images behind a proxy

Have resolved the issue by following the below steps:

step 1: sudo systemctl start docker

step 2: sudo systemctl enable docker

(Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.)

step 3: sudo systemctl status docker

step 4: sudo mkdir -p /etc/systemd/system/docker.service.d

step 5: sudo vi /etc/systemd/system/docker.service.d/proxy.conf

Set proxy as below

[Service]

Environment="HTTP_PROXY=http://proxy.server.com:80"

Environment="HTTPS_PROXY=http://proxy.server.com:80"

Environment="NO_PROXY=.proxy.server.com,*.proxy.server.com,localhost,127.0.0.1,::1"

step 6: sudo systemctl daemon-reload

step 7: sudo systemctl restart docker.service

step 8: vi /etc/environment and source /etc/environment

http_proxy=http://proxy.server.com:80 https_proxy=http://proxy.server.com:80 ftp_proxy=http://proxy.server.com:80 no_proxy=127.0.0.1,10.0.0.0/8,3.0.0.0/8,localhost,*.abc.com

How to get the day of week and the month of the year?

Use the standard javascript Date class. No need for arrays. No need for extra libraries.

See https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleDateString

_x000D_

var options = {  weekday: 'long', year: 'numeric', month: 'long', day: 'numeric', hour: '2-digit', minute: '2-digit', second: '2-digit', hour12: false };_x000D_
var prnDt = 'Printed on ' + new Date().toLocaleTimeString('en-us', options);_x000D_
_x000D_
console.log(prnDt);

_x000D_

Omit rows containing specific column of NA

It is possible to use na.omit for data.table:

na.omit(data, cols = c("x", "z"))

How do I send a POST request as a JSON?

This works perfect for Python 3.5, if the URL contains Query String / Parameter value,

Request URL = https://bah2.com/ws/rest/v1/concept/
Parameter value = 21f6bb43-98a1-419d-8f0c-8133669e40ca

import requests

url = 'https://bahbah2.com/ws/rest/v1/concept/21f6bb43-98a1-419d-8f0c-8133669e40ca'
data = {"name": "Value"}
r = requests.post(url, auth=('username', 'password'), verify=False, json=data)
print(r.status_code)

Why is this error, 'Sequence contains no elements', happening?

In the following line.

temp.Response = db.Responses.Where(y => y.ResponseId.Equals(item.ResponseId)).First();

You are calling First but the collection returned from db.Responses.Where is empty.

Accessing all items in the JToken

If you know the structure of the json that you're receiving then I'd suggest having a class structure that mirrors what you're receiving in json.

Then you can call its something like this...

AddressMap addressMap = JsonConvert.DeserializeObject<AddressMap>(json);

(Where json is a string containing the json in question)

If you don't know the format of the json you've receiving then it gets a bit more complicated and you'd probably need to manually parse it.

check out http://www.hanselman.com/blog/NuGetPackageOfTheWeek4DeserializingJSONWithJsonNET.aspx for more info

Algorithm to randomly generate an aesthetically-pleasing color palette

function fnGetRandomColour(iDarkLuma, iLightLuma) 
{       
  for (var i=0;i<20;i++)
  {
    var sColour = ('ffffff' + Math.floor(Math.random() * 0xFFFFFF).toString(16)).substr(-6);

    var rgb = parseInt(sColour, 16);   // convert rrggbb to decimal
    var r = (rgb >> 16) & 0xff;  // extract red
    var g = (rgb >>  8) & 0xff;  // extract green
    var b = (rgb >>  0) & 0xff;  // extract blue

    var iLuma = 0.2126 * r + 0.7152 * g + 0.0722 * b; // per ITU-R BT.709


    if (iLuma > iDarkLuma && iLuma < iLightLuma) return sColour;
  }
  return sColour;
}

For pastel, pass in higher luma dark/light integers - ie fnGetRandomColour(120, 250)

Credits: all credits to http://paulirish.com/2009/random-hex-color-code-snippets/ stackoverflow.com/questions/12043187/how-to-check-if-hex-color-is-too-black

How to make an embedded video not autoplay

I had the same problem and came across this post. Nothing worked. After randomly playing around, I found that <embed ........ play="false"> stopped it from playing automatically. I now have the problem that I can't get a controller to appear, so can't start the movie! :S

How do I read / convert an InputStream into a String in Java?

Raghu K Nair Was the only one using a scanner. The code I use is a little different:

String convertToString(InputStream in){
    Scanner scanner = new Scanner(in)
    scanner.useDelimiter("\\A");

    boolean hasInput = scanner.hasNext();
    if (hasInput) {
        return scanner.next();
    } else {
        return null;
    }

}

About Delimiters: How do I use a delimiter in Java Scanner?

Fitting polynomial model to data in R

The easiest way to find the best fit in R is to code the model as:

lm.1 <- lm(y ~ x + I(x^2) + I(x^3) + I(x^4) + ...)

After using step down AIC regression

lm.s <- step(lm.1)

Detecting Windows or Linux?

I think It's a best approach to use Apache lang dependency to decide which OS you're running programmatically through Java

import org.apache.commons.lang3.SystemUtils;

public class App {
    public static void main( String[] args ) {
        if(SystemUtils.IS_OS_WINDOWS_7)
            System.out.println("It's a Windows 7 OS");
        if(SystemUtils.IS_OS_WINDOWS_8)
            System.out.println("It's a Windows 8 OS");
        if(SystemUtils.IS_OS_LINUX)
            System.out.println("It's a Linux OS");
        if(SystemUtils.IS_OS_MAC)
            System.out.println("It's a MAC OS");
    }
}

while-else-loop

This while else statement should only execute the else code when the condition is false, this means it will always execute it. But, there is a catch, when you use the break keyword within the while loop, the else statement should not execute.

The code that satisfies does condition is only:

boolean entered = false;
while (condition) {
   entered = true; // Set it to true stright away
   // While loop code


   // If you want to break out of this loop
   if (condition) {
      entered = false;
      break;
   }
} if (!entered) {
   // else code
}

How do I measure a time interval in C?

If your Linux system supports it, clock_gettime(CLOCK_MONOTONIC) should be a high resolution timer that is unaffected by system date changes (e.g. NTP daemons).

HTML colspan in CSS

I've created this fiddle:

enter image description here

http://jsfiddle.net/wo40ev18/3/

HTML

<div id="table">
<div class="caption">
    Center Caption
</div>
<div class="group">
      <div class="row">
            <div class="cell">Link 1t</div>
            <div class="cell"></div>
          <div class="cell"></div>
          <div class="cell"></div>
            <div class="cell"></div>
            <div class="cell ">Link 2</div>
      </div>
</div>

CSS

   #table {
    display:table;
}

.group {display: table-row-group; }

.row {
    display:table-row;
    height: 80px;
    line-height: 80px;
}

.cell {
    display:table-cell;
    width:1%;
    text-align: center;
    border:1px solid grey;
    height: 80px
        line-height: 80px;
}

.caption {
    border:1px solid red; caption-side: top; display: table-caption; text-align: center; 
    position: relative;
    top: 80px;
    height: 80px;
      height: 80px;
    line-height: 80px;

}

Get List of connected USB Devices

Add a reference to System.Management for your project, then try something like this:

namespace ConsoleApplication1
{
  using System;
  using System.Collections.Generic;
  using System.Management; // need to add System.Management to your project references.

  class Program
  {
    static void Main(string[] args)
    {
      var usbDevices = GetUSBDevices();

      foreach (var usbDevice in usbDevices)
      {
        Console.WriteLine("Device ID: {0}, PNP Device ID: {1}, Description: {2}",
            usbDevice.DeviceID, usbDevice.PnpDeviceID, usbDevice.Description);
      }

      Console.Read();
    }

    static List<USBDeviceInfo> GetUSBDevices()
    {
      List<USBDeviceInfo> devices = new List<USBDeviceInfo>();

      ManagementObjectCollection collection;
      using (var searcher = new ManagementObjectSearcher(@"Select * From Win32_USBHub"))
        collection = searcher.Get();      

      foreach (var device in collection)
      {
        devices.Add(new USBDeviceInfo(
        (string)device.GetPropertyValue("DeviceID"),
        (string)device.GetPropertyValue("PNPDeviceID"),
        (string)device.GetPropertyValue("Description")
        ));
      }

      collection.Dispose();
      return devices;
    }
  }

  class USBDeviceInfo
  {
    public USBDeviceInfo(string deviceID, string pnpDeviceID, string description)
    {
      this.DeviceID = deviceID;
      this.PnpDeviceID = pnpDeviceID;
      this.Description = description;
    }
    public string DeviceID { get; private set; }
    public string PnpDeviceID { get; private set; }
    public string Description { get; private set; }
  }
}

How to create a circular ImageView in Android?

I too needed a rounded ImageView, I used the below code, you can modify it accordingly:

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RoundedImageView extends ImageView {

    public RoundedImageView(Context context) {
        super(context);
    }

    public RoundedImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public RoundedImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        Drawable drawable = getDrawable();

        if (drawable == null) {
            return;
        }

        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

        int w = getWidth();
        @SuppressWarnings("unused")
        int h = getHeight();

        Bitmap roundBitmap = getCroppedBitmap(bitmap, w);
        canvas.drawBitmap(roundBitmap, 0, 0, null);

    }

    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {
        Bitmap sbmp;

        if (bmp.getWidth() != radius || bmp.getHeight() != radius) {
            float smallest = Math.min(bmp.getWidth(), bmp.getHeight());
            float factor = smallest / radius;
            sbmp = Bitmap.createScaledBitmap(bmp,
                    (int) (bmp.getWidth() / factor),
                    (int) (bmp.getHeight() / factor), false);
        } else {
            sbmp = bmp;
        }

        Bitmap output = Bitmap.createBitmap(radius, radius, Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final String color = "#BAB399";
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, radius, radius);

        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(Color.parseColor(color));
        canvas.drawCircle(radius / 2 + 0.7f, radius / 2 + 0.7f,
                radius / 2 + 0.1f, paint);
        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(sbmp, rect, rect, paint);

        return output;
    }

}

Convert a character digit to the corresponding integer in C

Check this,

char s='A';

int i = (s<='9')?(s-'0'):(s<='F')?((s-'A')+10):((s-'a')+10);

for only 0,1,2,....,E,F.

Using a Glyphicon as an LI bullet point (Bootstrap 3)

If anyone is coming here looking to do this with Font Awesome Icons (like I was) view here: https://fontawesome.com/how-to-use/on-the-web/styling/icons-in-a-list

<ul class="fa-ul">
  <li><i class="fa-li fa fa-check-square"></i>List icons</li>
  <li><i class="fa-li fa fa-check-square"></i>can be used</li>
  <li><i class="fa-li fa fa-spinner fa-spin"></i>as bullets</li>
  <li><i class="fa-li fa fa-square"></i>in lists</li>
</ul>

The fa-ul and fa-li classes easily replace default bullets in unordered lists.

html vertical align the text inside input type button

I've given up trying to align my text on buttons! Now, if I need it, I'm using <a> tags, like so:

<a href="javascript:void();" style="display:block;font-size:1em;padding:5px;cursor:default;" onclick="document.getElementById('form').submit();">Submit</a>

So, if the document's font size is 12px, my "button" will have 22px height. And the text will be vertically align. That in theory, because, in some casses, an unequal padding of "6px 5px 4px 5px" will do the job done.

Although, is a hack, this technique is pretty good for solving compatibility issues in older browsers too, like IE6!

Why when a constructor is annotated with @JsonCreator, its arguments must be annotated with @JsonProperty?

One can simply use java.bean.ConstructorProperties annotation - it's much less verbose and Jackson also accepts it. For example :

  import java.beans.ConstructorProperties;

  @ConstructorProperties({"answer","closed","language","interface","operation"})
  public DialogueOutput(String answer, boolean closed, String language, String anInterface, String operation) {
    this.answer = answer;
    this.closed = closed;
    this.language = language;
    this.anInterface = anInterface;
    this.operation = operation;
  }

Using jQuery to test if an input has focus

April 2015 Update

Since this question has been around a while, and some new conventions have come into play, I feel that I should mention the .live method has been depreciated.

In its place, the .on method has now been introduced.

Their documentation is quite useful in explaining how it works;

The .on() method attaches event handlers to the currently selected set of elements in the jQuery object. As of jQuery 1.7, the .on() method provides all functionality required for attaching event handlers. For help in converting from older jQuery event methods, see .bind(), .delegate(), and .live().

So, in order for you to target the 'input focused' event, you can use this in a script. Something like:

$('input').on("focus", function(){
   //do some stuff
});

This is quite robust and even allows you to use the TAB key as well.

Illegal string offset Warning PHP

Before to check the array, do this:

if(!is_array($memcachedConfig))
     $memcachedConfig = array();

Split string into strings by length?

# spliting a string by the length of the string

def len_split(string,sub_string):
    n,sub,str1=list(string),len(sub_string),')/^0*/-'
    for i in range(sub,len(n)+((len(n)-1)//sub),sub+1):
        n.insert(i,str1)   
    n="".join(n)
    n=n.split(str1)
    return n

x="divyansh_looking_for_intership_actively_contact_Me_here"
sub="four"
print(len_split(x,sub))

# Result-> ['divy', 'ansh', 'tiwa', 'ri_l', 'ooki', 'ng_f', 'or_i', 'nter', 'ship', '_con', 'tact', '_Me_', 'here']

SQLAlchemy equivalent to SQL "LIKE" statement

Adding to the above answer, whoever looks for a solution, you can also try 'match' operator instead of 'like'. Do not want to be biased but it perfectly worked for me in Postgresql.

Note.query.filter(Note.message.match("%somestr%")).all()

It inherits database functions such as CONTAINS and MATCH. However, it is not available in SQLite.

For more info go Common Filter Operators

Can HTML checkboxes be set to readonly?

Some of the answers on here seem a bit roundabout, but here's a small hack.

<form id="aform" name="aform" method="POST">
    <input name="chkBox_1" type="checkbox" checked value="1" disabled="disabled" />
    <input id="submitBttn" type="button" value="Submit" onClick='return submitPage();'>
</form>?

then in jquery you can either choose one of two options:

$(document).ready(function(){
    //first option, you don't need the disabled attribute, this will prevent
    //the user from changing the checkbox values
    $("input[name^='chkBox_1']").click(function(e){
        e.preventDefault();
    });

    //second option, keep the disabled attribute, and disable it upon submit
    $("#submitBttn").click(function(){
        $("input[name^='chkBox_1']").attr("disabled",false);
        $("#aform").submit();
    });

});

demo: http://jsfiddle.net/5WFYt/

html button to send email

As David notes, his suggestion does not actually fulfill the OP's request, which was an email with subject and message. It doesn't work because most, maybe all, combinations of browsers plus e-mail clients do not accept the subject and body attributes of the mailto: URI when supplied as a <form>'s action.

But here's a working example:

HTML (with Bootstrap styles):

<p><input id="subject" type="text" placeholder="type your subject here" 
    class="form-control"></p>
<p><input id="message" type="text" placeholder="type your message here" 
    class="form-control"></p>
<p><a id="mail-link" class="btn btn-primary">Create email</a></p>

JavaScript (with jQuery):

<script type="text/javascript">
    function loadEvents() {
        var mailString;
        function updateMailString() {
            mailString = '?subject=' + encodeURIComponent($('#subject').val())
                + '&body=' + encodeURIComponent($('#message').val());
            $('#mail-link').attr('href',  'mailto:[email protected]' + mailString);
        }
        $( "#subject" ).focusout(function() { updateMailString(); });
        $( "#message" ).focusout(function() { updateMailString(); });
        updateMailString();
    }
</script>

Notes:

The <form> element with associated action attribute is not used.
The <input> element of type button is also not used.
- <a> styled as a button (here using Bootstrap) replaces <input type="button">
- focusout() with updateMailString() is necessary because the <a> tag's href attribute does not automatically update when the input fields' values change.
- updateMailString() is also called when document is loaded in case the input fields are prepopulated.
Also encodeURIComponent() is used to get characters such as the quotation mark (") across to Outlook.

In this approach, the mailto: URI is supplied (with subject and body attributes) in an a element's href tag. This works in all combinations of browsers and e-mail clients I have tested, which are recent (2015) versions of:

Browsers: Firefox/Win&OSX, Chrome/Win&OSX, IE/Win, Safari/OSX&iOS, Opera/OSX
E-mail clients: Outlook/Win, Mail.app/OSX&iOS, Sparrow/OSX

Bonus tip: In my use cases, I add some contextual text to the e-mail body. More often than not, I want that text to contain line breaks. %0D%0A (carriage return and linefeed) works in my tests.

Alternative Windows shells, besides CMD.EXE?

I am a fan of Cmder, a package including clink, conemu, msysgit, and some cosmetic enhancements.

http://cmder.net/

https://github.com/cmderdev/cmder

https://chocolatey.org/packages/Cmder

In android app Toolbar.setTitle method has no effect – application name is shown as title

Make sure you add this option:

getSupportActionBar().setDisplayOptions(ActionBar.DISPLAY_SHOW_TITLE);

How do I format XML in Notepad++?

"But can Notepad++ do it?"

If the XML is invalid, the answer is apparently 'no'. I tried Notepad++ with the Tidy2 and XMLTools plugins. Both give errors similar to "errors encountered, please fix". If you don't care about errors, that's a PITA.

Instead, open it in visual studio then edit -> advanced -> format document. Quick and pretty.

WPF Label Foreground Color

I checked your XAML, it works fine - e.g. both labels have a gray foreground.
My guess is that you have some style which is affecting the way it looks...

Try moving your XAML to a brand-new window and see for yourself... Then, check if you have any themes or styles (in the Window.Resources for instance) which might be affecting the labels...

Foreign Key Django Model

You create the relationships the other way around; add foreign keys to the Person type to create a Many-to-One relationship:

class Person(models.Model):
    name = models.CharField(max_length=50)
    birthday = models.DateField()
    anniversary = models.ForeignKey(
        Anniversary, on_delete=models.CASCADE)
    address = models.ForeignKey(
        Address, on_delete=models.CASCADE)

class Address(models.Model):
    line1 = models.CharField(max_length=150)
    line2 = models.CharField(max_length=150)
    postalcode = models.CharField(max_length=10)
    city = models.CharField(max_length=150)
    country = models.CharField(max_length=150)

class Anniversary(models.Model):
    date = models.DateField()

Any one person can only be connected to one address and one anniversary, but addresses and anniversaries can be referenced from multiple Person entries.

Anniversary and Address objects will be given a reverse, backwards relationship too; by default it'll be called person_set but you can configure a different name if you need to. See Following relationships "backward" in the queries documentation.

In Java, how can I determine if a char array contains a particular character?

You can iterate through the array or you can convert it to a String and use indexOf.

if (new String(charArray).indexOf('q') < 0) {
    break;
}

Creating a new String is a bit wasteful, but it's probably the tersest code. You can also write a method to imitate the effect without incurring the overhead.

Remove duplicates from a List<T> in C#

You can use Union

obj2 = obj1.Union(obj1).ToList();

How to select rows from a DataFrame based on column values

I find the syntax of the previous answers to be redundant and difficult to remember. Pandas introduced the query() method in v0.13 and I much prefer it. For your question, you could do df.query('col == val')

Reproduced from http://pandas.pydata.org/pandas-docs/version/0.17.0/indexing.html#indexing-query

In [167]: n = 10

In [168]: df = pd.DataFrame(np.random.rand(n, 3), columns=list('abc'))

In [169]: df
Out[169]: 
          a         b         c
0  0.687704  0.582314  0.281645
1  0.250846  0.610021  0.420121
2  0.624328  0.401816  0.932146
3  0.011763  0.022921  0.244186
4  0.590198  0.325680  0.890392
5  0.598892  0.296424  0.007312
6  0.634625  0.803069  0.123872
7  0.924168  0.325076  0.303746
8  0.116822  0.364564  0.454607
9  0.986142  0.751953  0.561512

# pure python
In [170]: df[(df.a < df.b) & (df.b < df.c)]
Out[170]: 
          a         b         c
3  0.011763  0.022921  0.244186
8  0.116822  0.364564  0.454607

# query
In [171]: df.query('(a < b) & (b < c)')
Out[171]: 
          a         b         c
3  0.011763  0.022921  0.244186
8  0.116822  0.364564  0.454607

You can also access variables in the environment by prepending an @.

exclude = ('red', 'orange')
df.query('color not in @exclude')

Android: Internet connectivity change listener

This should work:

public class ConnectivityChangeActivity extends Activity {

    private BroadcastReceiver networkChangeReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.d("app","Network connectivity change");
        }
    };

    @Override
    protected void onResume() {
        super.onResume();

        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
        registerReceiver(networkChangeReceiver, intentFilter);
    }

    @Override
    protected void onPause() {
        super.onPause();

        unregisterReceiver(networkChangeReceiver);
    }
}

Conditional HTML Attributes using Razor MVC3

I guess a little more convenient and structured way is to use Html helper. In your view it can be look like:

@{
 var htmlAttr = new Dictionary<string, object>();
 htmlAttr.Add("id", strElementId);
 if (!CSSClass.IsEmpty())
 {
   htmlAttr.Add("class", strCSSClass);
 }
}

@* ... *@

@Html.TextBox("somename", "", htmlAttr)

If this way will be useful for you i recommend to define dictionary htmlAttr in your model so your view doesn't need any @{ } logic blocks (be more clear).

JPA 2.0, Criteria API, Subqueries, In Expressions

You can use double join, if table A B are connected only by table AB.

public static Specification<A> findB(String input) {
    return (Specification<A>) (root, cq, cb) -> {
        Join<A,AB> AjoinAB = root.joinList(A_.AB_LIST,JoinType.LEFT);
        Join<AB,B> ABjoinB = AjoinAB.join(AB_.B,JoinType.LEFT);
        return cb.equal(ABjoinB.get(B_.NAME),input);
    };
}

That's just an another option
Sorry for that timing but I have came across this question and I also wanted to make SELECT IN but I didn't even thought about double join. I hope it will help someone.

PHP PDO returning single row

You could try this for a database SELECT query based on user input using PDO:

$param = $_GET['username'];

$query=$dbh->prepare("SELECT secret FROM users WHERE username=:param");
$query->bindParam(':param', $param);
$query->execute();

$result = $query -> fetch();

print_r($result);

How can I make a JPA OneToOne relation lazy

In native Hibernate XML mappings, you can accomplish this by declaring a one-to-one mapping with the constrained attribute set to true. I am not sure what the Hibernate/JPA annotation equivalent of that is, and a quick search of the doc provided no answer, but hopefully that gives you a lead to go on.

Using C# to check if string contains a string in string array

You can also do the same thing as Anton Gogolev suggests to check if any item in stringArray1 matches any item in stringArray2:

if(stringArray1.Any(stringArray2.Contains))

And likewise all items in stringArray1 match all items in stringArray2:

if(stringArray1.All(stringArray2.Contains))

Programs & Examples On #Web development server

Where does flask look for image files?

Should I always use a parallel stream when possible?

How to remove underline from a name on hover

Cloning a private Github repo

Sound effects in JavaScript / HTML5

Fast and Lean PDF Viewer for iPhone / iPad / iOS - tips and hints?

Creating a folder if it does not exists - "Item already exists"

Is it possible to open a Windows Explorer window from PowerShell?

break statement in "if else" - java

Javascript - get array of dates between 2 dates

Split text file into smaller multiple text file using command line

Spring @Transactional read-only propagation

INSTALL_FAILED_USER_RESTRICTED : android studio using redmi 4 device

print call stack in C or C++

How to find third or n?? maximum salary from salary table?

Why do I need to override the equals and hashCode methods in Java?

Oracle - How to generate script from sql developer

How to access a RowDataPacket object

delete map[key] in go?

Copied from Go 1 release notes

How to get a web page's source code from Java

Lint: How to ignore "<key> is not translated in <language>" errors?

File path issues in R using Windows ("Hex digits in character string" error)

How can I get the current directory name in Javascript?

String to HashMap JAVA

Entity Framework Core add unique constraint code-first

Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters

SQL Server 2000: How to exit a stored procedure?

ASP.Net MVC - Read File from HttpPostedFileBase without save

Find object by id in an array of JavaScript objects

Performance

Conclusions for solutions which use precalculations

Conclusions when searched objects ALWAYS exists

Conclusions when searched objects NEVER exists

Details

What is the list of valid @SuppressWarnings warning names in Java?

Mockito - NullpointerException when stubbing Method

2 "style" inline css img tags?

Play infinitely looping video on-load in HTML5

Converts scss to css

error: Libtool library used but 'LIBTOOL' is undefined

How to subtract 30 days from the current datetime in mysql?

How to convert an object to JSON correctly in Angular 2 with TypeScript

How to plot a subset of a data frame in R?

Using jQuery To Get Size of Viewport

Flexbox not giving equal width to elements

If statement in select (ORACLE)

Mobile Safari: Javascript focus() method on inputfield only works with click?

How to access custom attributes from event object in React?

python - checking odd/even numbers and changing outputs on number size

java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonFactory

org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

C++ Passing Pointer to Function (Howto) + C++ Pointer Manipulation

How to debug JavaScript / jQuery event bindings with Firebug or similar tools?

How to hide keyboard in swift on pressing return key?

Replace string within file contents

How to get the index with the key in Python dictionary?

Running shell command and capturing the output

Comparing chars in Java

Can a div have multiple classes (Twitter Bootstrap)

How do I Merge two Arrays in VBA?

Hiding elements in responsive layout?

New visible classes added to Bootstrap

For more information : http://getbootstrap.com/css/#responsive-utilities

React-router: How to manually invoke Link?

Using IF ELSE statement based on Count to execute different Insert statements

How do I add a submodule to a sub-directory?

How to add multiple jar files in classpath in linux

How to style UITextview to like Rounded Rect text field?

How to send email in ASP.NET C#

Why does my sorting loop seem to append an element where it shouldn't?

simulate background-size:cover on <video> or <img>

How to resolve git's "not something we can merge" error

What is the easiest way to clear a database from the CLI with manage.py in Django?

SSRS expression to format two decimal places does not show zeros

AngularJS $location not changing the path

Copy tables from one database to another in SQL Server

Cause of a process being a deadlock victim

"Error 1067: The process terminated unexpectedly" when trying to start MySQL