Programs & Examples On #Com

Component Object Model (COM) is a component technology from Microsoft, featuring remoting, language independence and interface-based programming. For questions about the COM serial port, you should use the [serial-port] tag instead.

How to repair COMException error 80040154?

WORKAROUND:

The possible workaround is modify your project's platform from 'Any CPU' to 'X86' (in Project's Properties, Build/Platform's Target)

ROOTCAUSE

The VSS Interop is a managed assembly using 32-bit Framework and the dll contains a 32-bit COM object. If you run this COM dll in 64 bit environment, you will get the error message.

C# - How to add an Excel Worksheet programmatically - Office XP / 2003

Would like to thank you for some excellent replies. @AR., your a star and it works perfectly. I had noticed last night that the Excel.exe was not closing; so I did some research and found out about how to release the COM objects. Here is my final code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.IO;
using Excel;

namespace testExcelconsoleApp
{
    class Program
    {
        private String fileLoc = @"C:\temp\test.xls";

        static void Main(string[] args)
        {
            Program p = new Program();
            p.createExcel();
        }

        private void createExcel()
        {
            Excel.Application excelApp = null;
            Excel.Workbook workbook = null;
            Excel.Sheets sheets = null;
            Excel.Worksheet newSheet = null;

            try
            {
                FileInfo file = new FileInfo(fileLoc);
                if (file.Exists)
                {
                    excelApp = new Excel.Application();
                    workbook = excelApp.Workbooks.Open(fileLoc, 0, false, 5, "", "",
                                                        false, XlPlatform.xlWindows, "",
                                                        true, false, 0, true, false, false);

                    sheets = workbook.Sheets;

                    //check columns exist
                    foreach (Excel.Worksheet sheet in sheets)
                    {
                        Console.WriteLine(sheet.Name);
                        sheet.Select(Type.Missing);

                        System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
                    }

                    newSheet = (Worksheet)sheets.Add(sheets[1], Type.Missing, Type.Missing, Type.Missing);
                    newSheet.Name = "My New Sheet";
                    newSheet.Cells[1, 1] = "BOO!";

                    workbook.Save();
                    workbook.Close(null, null, null);
                    excelApp.Quit();
                }
            }
            finally
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(newSheet);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(sheets);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
                System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp);

                newSheet = null;
                sheets = null;
                workbook = null;
                excelApp = null;

                GC.Collect();
            }
        }
    }
}

Thank you for all your help.

Register 32 bit COM DLL to 64 bit Windows 7

I believe, things have changed now. On My Win 2008 R2 Box, I was able to register a 32 bit dll with a 64 bit regsvr32 as the 64 bit version can detect the target bitness and spawn a new 32 bit regsvr32 from %SYSWOW% folder.

Refer: Registering a 32 bit DLL with 64 bit regsvr32

Could you explain STA and MTA?

Code that calls COM object dlls (for example, to read proprietary data files), may work fine in a user interface but hang mysteriously from a service. The reason is that as of .Net 2.0 user interfaces assume STA (thread-safe) while services assume MTA ((before that, services assumed STA). Having to create an STA thread for every COM call in a service can add significant overhead.

Error 80040154 (Class not registered exception) when initializing VCProjectEngineObject (Microsoft.VisualStudio.VCProjectEngine.dll)

There are not many good reasons this would fail, especially the regsvr32 step. Run dumpbin /exports on that dll. If you don't see DllRegisterServer then you've got a corrupt install. It should have more side-effects, you wouldn't be able to build C/C++ projects anymore.

One standard failure mode is running this on a 64-bit operating system. This is 32-bit unmanaged code, you would indeed get the 'class not registered' exception. Project + Properties, Build tab, change Platform Target to x86.

How to Enable ActiveX in Chrome?

There is a proprietary plugin called "Neptune" which says that it will allow you to use IE Tab functionality in Chrome on Windows.

Meadroid do this because they have ActiveX controls which they have written and they want them to be able to work in any browser, and they explicitly mention Chrome in the list of supported browsers for enabling ActiveX with this.

There is also a modified version of Chrome, called ChromePlus, which includes IETab, among other extra features.

I've not used either of these personally, but they look like they'll do what you want. I'd be interested to hear if they work out for you, as I know of other people who want to be able to use IEtab in Chrome :)

System.Runtime.InteropServices.COMException (0x800A03EC)

For all of those, who still experiencing this problem, I just spent 2 days tracking down the bloody thing. I was getting the same error when there was no rows in dataset. Seems obvious, but error message is very obscure, hence 2 days.

Is there an embeddable Webkit component for Windows / C# development?

Berkelium is a C++ tool for making chrome embeddable.

AwesomiumDotNet is a wrapper around both Berkelium and Awesomium

BTW, the link here to Awesomium appears to be more current.

The #include<iostream> exists, but I get an error: identifier "cout" is undefined. Why?

cout is in std namespace, you shall use std::cout in your code. And you shall not add using namespace std; in your header file, it's bad to mix your code with std namespace, especially don't add it in header file.

BSTR to std::string (std::wstring) and vice versa

BSTR to std::wstring:

// given BSTR bs
assert(bs != nullptr);
std::wstring ws(bs, SysStringLen(bs));

 
std::wstring to BSTR:

// given std::wstring ws
assert(!ws.empty());
BSTR bs = SysAllocStringLen(ws.data(), ws.size());

Doc refs:

  1. std::basic_string<typename CharT>::basic_string(const CharT*, size_type)
  2. std::basic_string<>::empty() const
  3. std::basic_string<>::data() const
  4. std::basic_string<>::size() const
  5. SysStringLen()
  6. SysAllocStringLen()

Class not registered Error

The problem is that the DLL is registered on the 32 bit version of the windows registry, and the application is using the 64 bit version.

Solution: Go into the Project Properties, Compile tab and click "Advanced Compile Options...". Change "Target CPU" to x86, click OK, save and try again.

Source: http://www.theogray.com/blog/2009/10/comexception-regdbeclassnotreg-on-64-bit-windows

Has worked for me with an VB 6 COM DLL invoked from a .Net 4 Winforms application

HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))

This could also be an issue of building the code using a 64 bit configuration. You can try to select x86 as the build platform which can solve this issue. To do this right-click the solution and select Configuration Manager From there you can change the Platform of the project using the 32-bit .dll to x86

Microsoft.Office.Core Reference Missing

If someone not have reference in .NET . COM (tab) or not have office installed on machine where visual was installed can do :

  1. Download and install: Microsoft Office Developer Tools
  2. Add references from:

    C:\Program Files (x86)\Microsoft Visual Studio 11.0\Visual Studio Tools for Office\PIA\Office15
    

How to handle AccessViolationException

Microsoft: "Corrupted process state exceptions are exceptions that indicate that the state of a process has been corrupted. We do not recommend executing your application in this state.....If you are absolutely sure that you want to maintain your handling of these exceptions, you must apply the HandleProcessCorruptedStateExceptionsAttribute attribute"

Microsoft: "Use application domains to isolate tasks that might bring down a process."

The program below will protect your main application/thread from unrecoverable failures without risks associated with use of HandleProcessCorruptedStateExceptions and <legacyCorruptedStateExceptionsPolicy>

public class BoundaryLessExecHelper : MarshalByRefObject
{
    public void DoSomething(MethodParams parms, Action action)
    {
        if (action != null)
            action();
        parms.BeenThere = true; // example of return value
    }
}

public struct MethodParams
{
    public bool BeenThere { get; set; }
}

class Program
{
    static void InvokeCse()
    {
        IntPtr ptr = new IntPtr(123);
        System.Runtime.InteropServices.Marshal.StructureToPtr(123, ptr, true);
    }

    private static void ExecInThisDomain()
    {
        try
        {
            var o = new BoundaryLessExecHelper();
            var p = new MethodParams() { BeenThere = false };
            Console.WriteLine("Before call");

            o.DoSomething(p, CausesAccessViolation);
            Console.WriteLine("After call. param been there? : " + p.BeenThere.ToString()); //never stops here
        }
        catch (Exception exc)
        {
            Console.WriteLine($"CSE: {exc.ToString()}");
        }
        Console.ReadLine();
    }


    private static void ExecInAnotherDomain()
    {
        AppDomain dom = null;

        try
        {
            dom = AppDomain.CreateDomain("newDomain");
            var p = new MethodParams() { BeenThere = false };
            var o = (BoundaryLessExecHelper)dom.CreateInstanceAndUnwrap(typeof(BoundaryLessExecHelper).Assembly.FullName, typeof(BoundaryLessExecHelper).FullName);         
            Console.WriteLine("Before call");

            o.DoSomething(p, CausesAccessViolation);
            Console.WriteLine("After call. param been there? : " + p.BeenThere.ToString()); // never gets to here
        }
        catch (Exception exc)
        {
            Console.WriteLine($"CSE: {exc.ToString()}");
        }
        finally
        {
            AppDomain.Unload(dom);
        }

        Console.ReadLine();
    }


    static void Main(string[] args)
    {
        ExecInAnotherDomain(); // this will not break app
        ExecInThisDomain();  // this will
    }
}

Retrieving the COM class factory for component failed

I had the same error when I deployed my app. I've got solution from this site: Component with CLSID XXX failed due to the following error: 80070005 Access is denied

Here is this solution:

  1. In DCOMCNFG, right click on the My Computer and select properties.

  2. Choose the COM Securities tab.

  3. In Access Permissions, click Edit Defaults and add Network Service to it and give it Allow local access permission. Do the same for < Machine_name >\Users.

  4. In Launch and Activation Permissions, click Edit Defaults and add Network Service to it and give it Local launch and Local Activation permission. Do the same for < Machine_name >\Users.

*I used forms authentication.

How to find difference between two columns data?

select previous, Present, previous-Present as Difference from tablename

or

select previous, Present, previous-Present as Difference from #TEMP1

How to add favicon.ico in ASP.NET site

Simply:

/favicon.ico

The leading slash is important.

Passing a variable from one php include file to another: global vs. not

Here is a pitfall to avoid. In case you need to access your variable $name within a function, you need to say "global $name;" at the beginning of that function. You need to repeat this for each function in the same file.

include('front.inc');
global $name;

function foo() {
  echo $name;
}

function bar() {
  echo $name;
}

foo();
bar();

will only show errors. The correct way to do that would be:

include('front.inc');

function foo() {
  global $name;
  echo $name;
}

function bar() {
  global $name;
  echo $name;
}

foo();
bar();

Programmatically extract contents of InstallShield setup.exe

There's no supported way to do this, but won't you have to examine the files related to each installer to figure out how to actually install them after extracting them? Assuming you can spend the time to figure out which command-line applies, here are some candidate parameters that normally allow you to extract an installation.

MSI Based (may not result in a usable image for an InstallScript MSI installation):

  • setup.exe /a /s /v"/qn TARGETDIR=\"choose-a-location\""

    or, to also extract prerequisites (for versions where it works),

  • setup.exe /a"choose-another-location" /s /v"/qn TARGETDIR=\"choose-a-location\""

InstallScript based:

  • setup.exe /s /extract_all

Suite based (may not be obvious how to install the resulting files):

  • setup.exe /silent /stage_only ISRootStagePath="choose-a-location"

Ruby, Difference between exec, system and %x() or Backticks

system

The system method calls a system program. You have to provide the command as a string argument to this method. For example:

>> system("date")
Wed Sep 4 22:03:44 CEST 2013
=> true

The invoked program will use the current STDIN, STDOUT and STDERR objects of your Ruby program. In fact, the actual return value is either true, false or nil. In the example the date was printed through the IO object of STDIN. The method will return true if the process exited with a zero status, false if the process exited with a non-zero status and nil if the execution failed.

As of Ruby 2.6, passing exception: true will raise an exception instead of returning false or nil:

>> system('invalid')
=> nil

>> system('invalid', exception: true)
Traceback (most recent call last):
...
Errno::ENOENT (No such file or directory - invalid)

Another side effect is that the global variable $? is set to a Process::Status object. This object will contain information about the call itself, including the process identifier (PID) of the invoked process and the exit status.

>> system("date")
Wed Sep 4 22:11:02 CEST 2013
=> true
>> $?
=> #<Process::Status: pid 15470 exit 0>

Backticks

Backticks (``) call a system program and return its output. As opposed to the first approach, the command is not provided through a string, but by putting it inside a backticks pair.

>> `date`
=> Wed Sep 4 22:22:51 CEST 2013   

The global variable $? is set through the backticks, too. With backticks you can also make use string interpolation.

%x()

Using %x is an alternative to the backticks style. It will return the output, too. Like its relatives %w and %q (among others), any delimiter will suffice as long as bracket-style delimiters match. This means %x(date), %x{date} and %x-date- are all synonyms. Like backticks %x can make use of string interpolation.

exec

By using Kernel#exec the current process (your Ruby script) is replaced with the process invoked through exec. The method can take a string as argument. In this case the string will be subject to shell expansion. When using more than one argument, then the first one is used to execute a program and the following are provided as arguments to the program to be invoked.

Open3.popen3

Sometimes the required information is written to standard input or standard error and you need to get control over those as well. Here Open3.popen3 comes in handy:

require 'open3'

Open3.popen3("curl http://example.com") do |stdin, stdout, stderr, thread|
   pid = thread.pid
   puts stdout.read.chomp
end

Incompatible implicit declaration of built-in function ‘malloc’

The only solution for such warnings is to include stdlib.h in the program.

org.hibernate.exception.SQLGrammarException: could not insert [com.sample.Person]

I solved the error by modifying the following property in hibernate.cfg.xml

<property name="hibernate.hbm2ddl.auto">validate</property>

Earlier, the table was getting deleted each time I ran the program and now it doesnt, as hibernate only validates the schema and does not affect changes to it.

As far as I know you can also change from validate to update e.g.:

<property name="hibernate.hbm2ddl.auto">update</property>

How can I filter a date of a DateTimeField in Django?

Now Django has __date queryset filter to query datetime objects against dates in development version. Thus, it will be available in 1.9 soon.

iPhone Safari Web App opens links in new window

This is working for me on iOS 6.1 and with Bootstrap JS links (i.e dropdown menus etc)

$(document).ready(function(){
    if (("standalone" in window.navigator) && window.navigator.standalone) {
      // For iOS Apps
      $('a').on('click', function(e){
        e.preventDefault();
        var new_location = $(this).attr('href');
        if (new_location != undefined && new_location.substr(0, 1) != '#' && $(this).attr('data-method') == undefined){
          window.location = new_location;
        }
      });
    }
  });

jquery validate check at least one checkbox

The validate plugin will only validate the current/focused element.Therefore you will need to add a custom rule to the validator to validate all the checkboxes. Similar to the answer above.

$.validator.addMethod("roles", function(value, elem, param) {
   return $(".roles:checkbox:checked").length > 0;
},"You must select at least one!");

And on the element:

<input class='{roles: true}' name='roles' type='checkbox' value='1' />

In addition, you will likely find the error message display, not quite sufficient. Only 1 checkbox is highlighted and only 1 message displayed. If you click another separate checkbox, which then returns a valid for the second checkbox, the original one is still marked as invalid, and the error message is still displayed, despite the form being valid. I have always resorted to just displaying and hiding the errors myself in this case.The validator then only takes care of not submitting the form.

The other option you have is to write a function that will change the value of a hidden input to be "valid" on the click of a checkbox and then attach the validation rule to the hidden element. This will only validate in the onSubmit event though, but will display and hide messages at the appropriate times. Those are about the only options that you can use with the validate plugin.

Hope that helps!

PHP foreach with Nested Array?

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

public function parent(){

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


public function children()
{

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

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

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

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

            $subChildren = $child->allChildren();

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

    return $allChildren; 
}

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

Trim leading and trailing spaces from a string in awk

The following seems to work:

awk -F',[[:blank:]]*' '{$2=$2}1' OFS="," input.txt

Executing periodic actions in Python

You can execute your task in a different thread. threading.Timer will let you execute a given callback once after some time has elapsed, if you want to execute your task, for example, as long as the callback returns True (this is actually what glib.timeout_add provides, but you might not have it installed in windows) or until you cancel it, you can use this code:

import logging, threading, functools
import time

logging.basicConfig(level=logging.NOTSET,
                    format='%(threadName)s %(message)s')

class PeriodicTimer(object):
    def __init__(self, interval, callback):
        self.interval = interval

        @functools.wraps(callback)
        def wrapper(*args, **kwargs):
            result = callback(*args, **kwargs)
            if result:
                self.thread = threading.Timer(self.interval,
                                              self.callback)
                self.thread.start()

        self.callback = wrapper

    def start(self):
        self.thread = threading.Timer(self.interval, self.callback)
        self.thread.start()

    def cancel(self):
        self.thread.cancel()


def foo():
    logging.info('Doing some work...')
    return True

timer = PeriodicTimer(1, foo)
timer.start()

for i in range(2):
    time.sleep(2)
    logging.info('Doing some other work...')

timer.cancel()

Example output:

Thread-1 Doing some work...
Thread-2 Doing some work...
MainThread Doing some other work...
Thread-3 Doing some work...
Thread-4 Doing some work...
MainThread Doing some other work...

Note: The callback isn't executed every interval execution. Interval is the time the thread waits between the callback finished the last time and the next time is called.

How do I get the current time zone of MySQL?

If you need the GMT difference as an integer:

SELECT EXTRACT(HOUR FROM (TIMEDIFF(NOW(), UTC_TIMESTAMP))) AS `timezone`

How do I convert a float to an int in Objective C?

In support of unwind, remember that Objective-C is a superset of C, rather than a completely new language.

Anything you can do in regular old ANSI C can be done in Objective-C.

What's the difference between django OneToOneField and ForeignKey?

ForeignKey allows you receive subclasses is it definition of another class but OneToOneFields cannot do this and it is not attachable to multiple variables

Error: EACCES: permission denied, access '/usr/local/lib/node_modules'

I was able to get rid of this issue by installing nvm, then setting node to latest version.

  1. Install nvm using curl (for latest version go to nvm.sh)
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash
  1. List available node versions
nvm ls

v10.12.0
default -> v10.12 (-> v10.12.0)
node -> stable (-> v10.12.0) (default)
stable -> 10.12 (-> v10.12.0)

  1. Choose which version of node to use
nvm use v10.12

nvm is not compatible with the npm config "prefix" option: currently set to ""

  1. Run this to unset the option:
nvm use --delete-prefix v10.12.0

After following the commands above, you will be able to install react/angular in Ubuntu.

Python error: AttributeError: 'module' object has no attribute

More accurately, your mod1 and lib directories are not modules, they are packages. The file mod11.py is a module.

Python does not automatically import subpackages or modules. You have to explicitly do it, or "cheat" by adding import statements in the initializers.

>>> import lib
>>> dir(lib)
['__builtins__', '__doc__', '__file__', '__name__', '__package__', '__path__']
>>> import lib.pkg1
>>> import lib.pkg1.mod11
>>> lib.pkg1.mod11.mod12()
mod12

An alternative is to use the from syntax to "pull" a module from a package into you scripts namespace.

>>> from lib.pkg1 import mod11

Then reference the function as simply mod11.mod12().

getting the reason why websockets closed with close code 1006

It looks like this is the case when Chrome is not compliant with WebSocket standard. When the server initiates close and sends close frame to a client, Chrome considers this to be an error and reports it to JS side with code 1006 and no reason message. In my tests, Chrome never responds to server-initiated close frames (close code 1000) suggesting that code 1006 probably means that Chrome is reporting its own internal error.

P.S. Firefox v57.00 handles this case properly and successfully delivers server's reason message to JS side.

How to fix Warning Illegal string offset in PHP

Please check that your key exists in the array or not, instead of simply trying to access it.

Replace:

$myVar = $someArray['someKey']

With something like:

if (isset($someArray['someKey'])) {
    $myVar = $someArray['someKey']
}

or something like:

if(is_array($someArray['someKey'])) {
    $theme_img = 'recent_works_iso_thumbnail';
}else {
    $theme_img = 'recent_works_iso_thumbnail';
}

Set focus and cursor to end of text input field / string w. Jquery

You can do this using Input.setSelectionRange, part of the Range API for interacting with text selections and the text cursor:

var searchInput = $('#Search');

// Multiply by 2 to ensure the cursor always ends up at the end;
// Opera sometimes sees a carriage return as 2 characters.
var strLength = searchInput.val().length * 2;

searchInput.focus();
searchInput[0].setSelectionRange(strLength, strLength);

Demo: Fiddle

How do I tell whether my IE is 64-bit? (For that matter, Java too?)

In addition to what TaskManager shows, if you use ProcessExplorer from Sysinternals, you can tell when you right-click on the process name and select Properties. In the Image tab, there is a field toward the bottom that says Image. It says 32-bit for a 32 bit application and 64 bit for the 64 bit application.

How to set TLS version on apache HttpClient

Using the HttpClientBuilder in HttpClient 4.5.x with a custom HttpClientConnectionManager with the defaults of HttpClientBuilder :

SSLConnectionSocketFactory sslConnectionSocketFactory = 
    new SSLConnectionSocketFactory(SSLContexts.createDefault(),          
                                   new String[] { "TLSv1.2" },                                            
                                   null, 
           SSLConnectionSocketFactory.getDefaultHostnameVerifier());

PoolingHttpClientConnectionManager poolingHttpClientConnectionManager =
    new PoolingHttpClientConnectionManager(
        RegistryBuilder.<ConnectionSocketFactory> create()
                       .register("http",
                                 PlainConnectionSocketFactory.getSocketFactory())
                       .register("https",
                                 sslConnectionSocketFactory)
                       .build());

// Customize the connection pool

CloseableHttpClient httpClient = HttpClientBuilder.create()
                                                  .setConnectionManager(poolingHttpClientConnectionManager)
                                                  .build()

Without a custom HttpClientConnectionManager :

SSLConnectionSocketFactory sslConnectionSocketFactory = 
    new SSLConnectionSocketFactory(SSLContexts.createDefault(),          
                                   new String[] { "TLSv1.2" },                                            
                                   null, 
           SSLConnectionSocketFactory.getDefaultHostnameVerifier());

CloseableHttpClient httpClient = HttpClientBuilder.create()
                                                  .setSSLSocketFactory(sslConnectionSocketFactory)
                                                  .build()

How to refer to Excel objects in Access VBA?

I dissent from both the answers. Don't create a reference at all, but use late binding:

  Dim objExcelApp As Object
  Dim wb As Object

  Sub Initialize()
    Set objExcelApp = CreateObject("Excel.Application")
  End Sub

  Sub ProcessDataWorkbook()
     Set wb = objExcelApp.Workbooks.Open("path to my workbook")
     Dim ws As Object
     Set ws = wb.Sheets(1)

     ws.Cells(1, 1).Value = "Hello"
     ws.Cells(1, 2).Value = "World"

     'Close the workbook
     wb.Close
     Set wb = Nothing
  End Sub

You will note that the only difference in the code above is that the variables are all declared as objects and you instantiate the Excel instance with CreateObject().

This code will run no matter what version of Excel is installed, while using a reference can easily cause your code to break if there's a different version of Excel installed, or if it's installed in a different location.

Also, the error handling could be added to the code above so that if the initial instantiation of the Excel instance fails (say, because Excel is not installed or not properly registered), your code can continue. With a reference set, your whole Access application will fail if Excel is not installed.

Convert a tensor to numpy array in Tensorflow?

TensorFlow 2.x

Eager Execution is enabled by default, so just call .numpy() on the Tensor object.

import tensorflow as tf

a = tf.constant([[1, 2], [3, 4]])                 
b = tf.add(a, 1)

a.numpy()
# array([[1, 2],
#        [3, 4]], dtype=int32)

b.numpy()
# array([[2, 3],
#        [4, 5]], dtype=int32)

tf.multiply(a, b).numpy()
# array([[ 2,  6],
#        [12, 20]], dtype=int32)

See NumPy Compatibility for more. It is worth noting (from the docs),

Numpy array may share memory with the Tensor object. Any changes to one may be reflected in the other.

Bold emphasis mine. A copy may or may not be returned, and this is an implementation detail based on whether the data is in CPU or GPU (in the latter case, a copy has to be made from GPU to host memory).

But why am I getting AttributeError: 'Tensor' object has no attribute 'numpy'?.
A lot of folks have commented about this issue, there are a couple of possible reasons:

  • TF 2.0 is not correctly installed (in which case, try re-installing), or
  • TF 2.0 is installed, but eager execution is disabled for some reason. In such cases, call tf.compat.v1.enable_eager_execution() to enable it, or see below.

If Eager Execution is disabled, you can build a graph and then run it through tf.compat.v1.Session:

a = tf.constant([[1, 2], [3, 4]])                 
b = tf.add(a, 1)
out = tf.multiply(a, b)

out.eval(session=tf.compat.v1.Session())    
# array([[ 2,  6],
#        [12, 20]], dtype=int32)

See also TF 2.0 Symbols Map for a mapping of the old API to the new one.

How do I escape ampersands in XML so they are rendered as entities in HTML?

Consider if your XML looks like below.

<Employees Id="1" Name="ABC">
  <Query>
    SELECT * FROM EMP WHERE ID=1 AND RES<>'GCF'
  <Query>
</Employees>

You cannot use the <> directly as it throws an error. In that case, you can use &#60;&#62; in replacement of that.

<Employees Id="1" Name="ABC">
  <Query>
    SELECT * FROM EMP WHERE ID=1 AND RES &#60;&#62; 'GCF'
  <Query>
</Employees>

Click here to see all the codes.

Calculate MD5 checksum for a file

And if you need to calculate the MD5 to see whether it matches the MD5 of an Azure blob, then this SO question and answer might be helpful: MD5 hash of blob uploaded on Azure doesnt match with same file on local machine

IIS AppPoolIdentity and file system write access permissions

Each application pool in IIs creates its own secure user folder with FULL read/write permission by default under c:\users. Open up your Users folder and see what application pool folders are there, right click, and check their rights for the application pool virtual account assigned. You should see your application pool account added already with read/write access assigned to its root and subfolders.

So that type of file storage access is automatically done and you should be able to write whatever you like there in the app pools user account folders without changing anything. That's why virtual user accounts for each application pool were created.

Java program to get the current date without timestamp

The accepted answer by Jesper is correct but now outdated. The java.util.Date and .Calendar classes are notoriously troublesome. Avoid them.

java.time

Instead use the java.time framework, built into Java 8 and later, back-ported to Java 6 & 7 and further adapted to Android.

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

If you truly do not care about time-of-day and time zones, use LocalDate in the java.time framework ().

LocalDate localDate = LocalDate.of( 2014 , 5 , 6 );

Today

A time zone is crucial in determining a date. For any given moment, the date varies around the globe by zone. For example, a few minutes after midnight in Paris France is a new day while still “yesterday” in Montréal Québec.

If no time zone is specified, the JVM implicitly applies its current default time zone. That default may change at any moment during runtime(!), so your results may vary. Better to specify your desired/expected time zone explicitly as an argument. If you want to use the JVM’s current default time zone, make your intention clear by calling ZoneId.systemDefault(). If critical, confirm the zone with your user.

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

ZoneId z = ZoneId.of( "America/Montreal" ) ;  
LocalDate today = LocalDate.now( z ) ;

If you want to use the JVM’s current default time zone, ask for it and pass as an argument. If omitted, the code becomes ambiguous to read in that we do not know for certain if you intended to use the default or if you, like so many programmers, were unaware of the issue.

ZoneId z = ZoneId.systemDefault() ;  // Get JVM’s current default time zone.
LocalDate today = LocalDate.now( z ) ;

Moment

If you care about specific moments, specific points on the timeline, do not use LocalDate. If you care about the date as seen through the wall-clock time used by the people of a certain region, do not use LocalDate.

Be aware that if you have any chance of needing to deal with other time zones or UTC, this is the wrong way to go. Naïve programmers tend to think they do not need time zones when in fact they do.

Strings

Call toString to generate a string in standard ISO 8601 format.

String output = localDate.toString();

2014-05-06

For other formats, search Stack Overflow for DateTimeFormatter class.

Joda-Time

Though now supplanted by java.time, you can use the similar LocalDate class in the Joda-Time library (the inspiration for java.time).

LocalDate localDate = new LocalDate( 2014, 5, 6 );

Debugging WebSocket in Google Chrome

You have 3 options: Chrome (via Developer Tools -> Network tab), Wireshark, and Fiddler (via Log tab), however they all very basic. If you have very high volume of traffic or each frame is very large, it becomes very difficult to use them for debugging.

You can however use Fiddler with FiddlerScript to inspect WebSocket traffic in the same way you inpect HTTP traffic. Few advantages of this solution are that you can leverage many other functionalities in Fiddler, such as multiple inspectors (HexView, JSON, SyntaxView), compare packets, and find packets, etc. Inspect WebSocket traffic

Please refer to my recently written article on CodeProject, which show you how to Debug/Inspect WebSocket traffic with Fiddler (with FiddlerScript). http://www.codeproject.com/Articles/718660/Debug-Inspect-WebSocket-traffic-with-Fiddler

How to split a file into equal parts, without breaking individual lines?

split was updated in coreutils release 8.8 (announced 22 Dec 2010) with the --number option to generate a specific number of files. The option --number=l/n generates n files without splitting lines.

http://www.gnu.org/software/coreutils/manual/html_node/split-invocation.html#split-invocation http://savannah.gnu.org/forum/forum.php?forum_id=6662

Section vs Article HTML5

The flowchart below can be of help when choosing one of the various semantic HTML5 elements: enter image description here

sqlalchemy IS NOT NULL select

column_obj != None will produce a IS NOT NULL constraint:

In a column context, produces the clause a != b. If the target is None, produces a IS NOT NULL.

or use isnot() (new in 0.7.9):

Implement the IS NOT operator.

Normally, IS NOT is generated automatically when comparing to a value of None, which resolves to NULL. However, explicit usage of IS NOT may be desirable if comparing to boolean values on certain platforms.

Demo:

>>> from sqlalchemy.sql import column
>>> column('YourColumn') != None
<sqlalchemy.sql.elements.BinaryExpression object at 0x10c8d8b90>
>>> str(column('YourColumn') != None)
'"YourColumn" IS NOT NULL'
>>> column('YourColumn').isnot(None)
<sqlalchemy.sql.elements.BinaryExpression object at 0x104603850>
>>> str(column('YourColumn').isnot(None))
'"YourColumn" IS NOT NULL'

How to detect responsive breakpoints of Twitter Bootstrap 3 using JavaScript?

It's been a while since the OP, but here's my solution for this using Bootstrap 3. In my use case, I was only targeting rows, but the same could be applied to the container, etc.

Just change .row to whatever you want.

jQuery(document).ready(function ($) {

    var alterClass = function () {

        var ww = document.body.clientWidth;

        if (ww < 768) {

            $('.row').addClass('is-xs').removeClass('is-sm').removeClass('is-lg').removeClass('is-md');

        } else if (ww >= 768 && ww < 992) {

            $('.row').addClass('is-sm').removeClass('is-xs').removeClass('is-lg').removeClass('is-md');

        } else if (ww >= 992 && ww < 1200) {

            $('.row').addClass('is-md').removeClass('is-xs').removeClass('is-lg').removeClass('is-sm');

        } else if (ww >= 1200) {

            $('.row').addClass('is-lg').removeClass('is-md').removeClass('is-sm').removeClass('is-xs');

        };
    };

    // Make Changes when the window is resized
    $(window).resize(function () {
        alterClass();
    });

    // Fire when the page first loads
    alterClass();
});

Named colors in matplotlib

To get a full list of colors to use in plots:

import matplotlib.colors as colors
colors_list = list(colors._colors_full_map.values())

So, you can use in that way quickly:

scatter(X,Y, color=colors_list[0])
scatter(X,Y, color=colors_list[1])
scatter(X,Y, color=colors_list[2])
...
scatter(X,Y, color=colors_list[-1])

Sum all values in every column of a data.frame in R

For the sake of completion:

 apply(people[,-1], 2, function(x) sum(x))
#Height Weight 
#   199    425 

Disable activity slide-in animation when launching new activity?

Apply

startActivity(new Intent(FirstActivity.this,SecondActivity.class));

then

overridePendingTransition(0, 0);

This will stop the animation.

T-SQL CASE Clause: How to specify WHEN NULL

When you get frustrated trying this:

CASE WHEN last_name IS NULL THEN '' ELSE ' '+last_name END

Try this one instead:

CASE LEN(ISNULL(last_Name,''))
WHEN 0 THEN '' 
ELSE ' ' + last_name
END AS newlastName

LEN(ISNULL(last_Name,'')) measures the number of characters in that column, which will be zero whether it's empty, or NULL, therefore WHEN 0 THEN will evaluate to true and return the '' as expected.

I hope this is a helpful alternative.

I have included this test case for sql server 2008 and above:

DECLARE @last_Name varchar(50) = NULL

SELECT 
CASE LEN(ISNULL(@last_Name,''))
WHEN 0 THEN '' 
ELSE 'A ' + @last_name
END AS newlastName

SET @last_Name = 'LastName'

SELECT 
CASE LEN(ISNULL(@last_Name,''))
WHEN 0 THEN '' 
ELSE 'A ' + @last_name
END AS newlastName

Sequelize OR condition object

Seems there is another format now

where: {
    LastName: "Doe",
    $or: [
        {
            FirstName: 
            {
                $eq: "John"
            }
        }, 
        {
            FirstName: 
            {
                $eq: "Jane"
            }
        }, 
        {
            Age: 
            {
                $gt: 18
            }
        }
    ]
}

Will generate

WHERE LastName='Doe' AND (FirstName = 'John' OR FirstName = 'Jane' OR Age > 18)

See the doc: http://docs.sequelizejs.com/en/latest/docs/querying/#where

Simplest way to wait some asynchronous tasks complete, in Javascript?

I see you are using mongoose so you are talking about server-side JavaScript. In that case I advice looking at async module and use async.parallel(...). You will find this module really helpful - it was developed to solve the problem you are struggling with. Your code may look like this

var async = require('async');

var calls = [];

['aaa','bbb','ccc'].forEach(function(name){
    calls.push(function(callback) {
        conn.collection(name).drop(function(err) {
            if (err)
                return callback(err);
            console.log('dropped');
            callback(null, name);
        });
    }
)});

async.parallel(calls, function(err, result) {
    /* this code will run after all calls finished the job or
       when any of the calls passes an error */
    if (err)
        return console.log(err);
    console.log(result);
});

How to draw a dotted line with css?

<style>
    .dotted {border: 1px dotted #ff0000; border-style: none none dotted; color: #fff; background-color: #fff; }
</style>
<hr class='dotted' />

How do I get indices of N maximum values in a NumPy array?

bottleneck has a partial sort function, if the expense of sorting the entire array just to get the N largest values is too great.

I know nothing about this module; I just googled numpy partial sort.

TCPDF output without saving file

If You want to open dialogue window in browser to save, not open with PDF browser viewer (I was looking for this solution for a while), You should use 'D':

$pdf->Output('name.pdf', 'D');

How to set a default entity property value with Hibernate

The above suggestion works, but only if the annotation is used on the getter method. If the annotations is used where the member is declared, nothing will happen.

public String getStringValue(){
     return (this.stringValue == null) ? "Default" : stringValue;
}

How to set session variable in jquery?

Use localStorage to store the fact that you opened the page :

$(document).ready(function() {
    var yetVisited = localStorage['visited'];
    if (!yetVisited) {
        // open popup
        localStorage['visited'] = "yes";
    }
});

upgade python version using pip

pip is designed to upgrade python packages and not to upgrade python itself. pip shouldn't try to upgrade python when you ask it to do so.

Don't type pip install python but use an installer instead.

How do I specify row heights in CSS Grid layout?

One of the Related posts gave me the (simple) answer.

Apparently the auto value on the grid-template-rows property does exactly what I was looking for.

.grid {
    display:grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    grid-template-rows: auto auto 1fr 1fr 1fr auto auto;
    grid-gap:10px;
    height: calc(100vh - 10px);
}

How to establish a connection pool in JDBC?

Usually if you need a connection pool you are writing an application that runs in some managed environment, that is you are running inside an application server. If this is the case be sure to check what connection pooling facilities your application server providesbefore trying any other options.

The out-of-the box solution will be the best integrated with the rest of the application servers facilities. If however you are not running inside an application server I would recommend the Apache Commons DBCP Component. It is widely used and provides all the basic pooling functionality most applications require.

bypass invalid SSL certificate in .net core

I solve with this:

Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
        services.AddHttpClient("HttpClientWithSSLUntrusted").ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
        {
            ClientCertificateOptions = ClientCertificateOption.Manual,
            ServerCertificateCustomValidationCallback =
            (httpRequestMessage, cert, cetChain, policyErrors) =>
            {
                return true;
            }
        });

YourService.cs

public UserService(IHttpClientFactory clientFactory, IOptions<AppSettings> appSettings)
    {
        _appSettings = appSettings.Value;
        _clientFactory = clientFactory;
    }

var request = new HttpRequestMessage(...

var client = _clientFactory.CreateClient("HttpClientWithSSLUntrusted");

HttpResponseMessage response = await client.SendAsync(request);

Request format is unrecognized for URL unexpectedly ending in

In my case the error happened when i move from my local PC Windows 10 to a dedicated server with Windows 2012. The solution for was to add to the web.config the following lines

<webServices>
        <protocols>
               <add name="Documentation"/>
        </protocols>
</webServices>

Virtual network interface in Mac OS X

A few others seemed to hint at this, but the following demonstrates using ifconfig to create a vlan and test DNS on the virtual interface (using minidns) on OS X 10.9.5:

$ sw_vers -productVersion
10.9.5
$ sudo ifconfig vlan169 create && echo vlan169 created
vlan169 created
$ sudo ifconfig vlan169 inet 169.254.169.254 netmask 255.255.255.255 && echo vlan169 configured
vlan169 configured
$ sudo ./minidns.py 169.254.169.254 &
[1] 35125
$ miniDNS :: * 60 IN A 169.254.169.254


$ dig @169.254.169.254 +short test.host
Request: test.host. -> 169.254.169.254
Request: test.host. -> 169.254.169.254
169.254.169.254
$ sudo kill 35125
$ 
[1]+  Exit 143                sudo ./minidns.py 169.254.169.254
$ sudo ifconfig vlan169 destroy && echo vlan169 destroyed
vlan169 destroyed

How to use a parameter in ExecStart command line?

Although systemd indeed does not provide way to pass command-line arguments for unit files, there are possibilities to write instances: http://0pointer.de/blog/projects/instances.html

For example: /lib/systemd/system/[email protected] looks something like this:

[Unit]
Description=Serial Getty on %I
BindTo=dev-%i.device
After=dev-%i.device systemd-user-sessions.service

[Service]
ExecStart=-/sbin/agetty -s %I 115200,38400,9600
Restart=always
RestartSec=0

So, you may start it like:

$ systemctl start [email protected]
$ systemctl start [email protected]

For systemd it will different instances:

$ systemctl status [email protected]
[email protected] - Getty on ttyUSB0
      Loaded: loaded (/lib/systemd/system/[email protected]; static)
      Active: active (running) since Mon, 26 Sep 2011 04:20:44 +0200; 2s ago
    Main PID: 5443 (agetty)
      CGroup: name=systemd:/system/[email protected]/ttyUSB0
          + 5443 /sbin/agetty -s ttyUSB0 115200,38400,9600

It also mean great possibility enable and disable it separately.

Off course it lack much power of command line parsing, but in common way it is used as some sort of config files selection. For example you may look at Fedora [email protected]: http://pkgs.fedoraproject.org/cgit/openvpn.git/tree/[email protected]

Spring JPA @Query with LIKE

Another way: instead CONCAT function we can use double pipe: :lastname || '%'

@Query("select c from Customer c where c.lastName LIKE :lastname||'%'")
List<Customer> findCustomByLastName( @Param("lastname") String lastName);

You can put anywhere, prefix, suffix or both

:lastname ||'%'  
'%' || :lastname  
'%' || :lastname || '%'  

Adjusting HttpWebRequest Connection Timeout in C#

I believe that the problem is that the WebRequest measures the time only after the request is actually made. If you submit multiple requests to the same address then the ServicePointManager will throttle your requests and only actually submit as many concurrent connections as the value of the corresponding ServicePoint.ConnectionLimit which by default gets the value from ServicePointManager.DefaultConnectionLimit. Application CLR host sets this to 2, ASP host to 10. So if you have a multithreaded application that submits multiple requests to the same host only two are actually placed on the wire, the rest are queued up.

I have not researched this to a conclusive evidence whether this is what really happens, but on a similar project I had things were horrible until I removed the ServicePoint limitation.

Another factor to consider is the DNS lookup time. Again, is my belief not backed by hard evidence, but I think the WebRequest does not count the DNS lookup time against the request timeout. DNS lookup time can show up as very big time factor on some deployments.

And yes, you must code your app around the WebRequest.BeginGetRequestStream (for POSTs with content) and WebRequest.BeginGetResponse (for GETs and POSTSs). Synchronous calls will not scale (I won't enter into details why, but that I do have hard evidence for). Anyway, the ServicePoint issue is orthogonal to this: the queueing behavior happens with async calls too.

SVN upgrade working copy

After upgrading to the latest version of Tortoise-SVN I needed to do an "Upgrade" first (as opposed to "Update"!).

adding .css file to ejs

In order to serve up a static CSS file in express app (i.e. use a css style file to style ejs "templates" files in express app). Here are the simple 3 steps that need to happen:

  1. Place your css file called "styles.css" in a folder called "assets" and the assets folder in a folder called "public". Thus the relative path to the css file should be "/public/assets/styles.css"

  2. In the head of each of your ejs files you would simply call the css file (like you do in a regular html file) with a <link href=… /> as shown in the code below. Make sure you copy and paste the code below directly into your ejs file <head> section

    <link href= "/public/assets/styles.css" rel="stylesheet" type="text/css" />
    
  3. In your server.js file, you need to use the app.use() middleware. Note that a middleware is nothing but a term that refers to those operations or code that is run between the request and the response operations. By putting a method in middleware, that method will automatically be called everytime between the request and response methods. To serve up static files (such as a css file) in the app.use() middleware there is already a function/method provided by express called express.static(). Lastly, you also need to specify a request route that the program will respond to and serve up the files from the static folder everytime the middleware is called. Since you will be placing the css files in your public folder. In the server.js file, make sure you have the following code:

    // using app.use to serve up static CSS files in public/assets/ folder when /public link is called in ejs files
    // app.use("/route", express.static("foldername"));
    app.use('/public', express.static('public'));
    

After following these simple 3 steps, every time you res.render('ejsfile') in your app.get() methods you will automatically see the css styling being called. You can test by accessing your routes in the browser.

dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib

brew switch openssl 1.0.2t

catalina this is ok.

How to loop through all but the last item of a list?

If you want to get all the elements in the sequence pair wise, use this approach (the pairwise function is from the examples in the itertools module).

from itertools import tee, izip, chain

def pairwise(seq):
    a,b = tee(seq)
    b.next()
    return izip(a,b)

for current_item, next_item in pairwise(y):
    if compare(current_item, next_item):
        # do what you have to do

If you need to compare the last value to some special value, chain that value to the end

for current, next_item in pairwise(chain(y, [None])):

Netbeans - Error: Could not find or load main class

I faced the similar issue with Netbeans 10 and JDK 1.8. I was not able to choose the right class to launch the project When I compile or run the project, it shows me the Class name as "initializing view, please wait ...", I could not select the class name. The issue was resolved with the NetBeans11.3, I am able to choose the correct Class file without any other changes, and the project is launched without any issues.

How to use jQuery to call an ASP.NET web service?

I quite often use ajaxpro along with jQuery. ajaxpro lets me call .NET functions from JavaScript and I use jQuery for the rest.

How to clear the interpreter console?

I'm not sure if Windows' "shell" supports this, but on Linux:

print "\033[2J"

https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_codes

In my opinion calling cls with os is a bad idea generally. Imagine if I manage to change the cls or clear command on your system, and you run your script as admin or root.

[] and {} vs list() and dict(), which is better?

In my opinion [] and {} are the most pythonic and readable ways to create empty lists/dicts.

Be wary of set()'s though, for example:

this_set = {5}
some_other_set = {}

Can be confusing. The first creates a set with one element, the second creates an empty dict and not a set.

Grant SELECT on multiple tables oracle

You can do it with dynamic query, just run the following script in pl-sql or sqlplus:

select 'grant select on user_name_owner.'||table_name|| 'to user_name1 ;' from dba_tables t where t.owner='user_name_owner'

and then execute result.

Find out where MySQL is installed on Mac OS X

It will be found in /usr/local/mysql if you use the mysql binaries or dmg to install it on your system instead of using MAMP

numpy array TypeError: only integer scalar arrays can be converted to a scalar index

this problem arises when we use vectors in place of scalars for example in a for loop the range should be a scalar, in case you have given a vector in that place you get error. So to avoid the problem use the length of the vector you have used

How to restart Postgresql

This should work:

sudo systemctl stop postgresql

sudo systemctl start postgresql

Node.js on multi-core machines

I'm using Node worker to run processes in a simple way from my main process. Seems to be working great while we wait for the official way to come around.

How to get all files under a specific directory in MATLAB?

I don't know a single-function method for this, but you can use genpath to recurse a list of subdirectories only. This list is returned as a semicolon-delimited string of directories, so you'll have to separate it using strread, i.e.

dirlist = strread(genpath('/path/of/directory'),'%s','delimiter',';')

If you don't want to include the given directory, remove the first entry of dirlist, i.e. dirlist(1)=[]; since it is always the first entry.

Then get the list of files in each directory with a looped dir.

filenamelist=[];
for d=1:length(dirlist)
    % keep only filenames
    filelist=dir(dirlist{d});
    filelist={filelist.name};

    % remove '.' and '..' entries
    filelist([strmatch('.',filelist,'exact');strmatch('..',filelist,'exact'))=[];
    % or to ignore all hidden files, use filelist(strmatch('.',filelist))=[];

    % prepend directory name to each filename entry, separated by filesep*
    for f=1:length(filelist)
        filelist{f}=[dirlist{d} filesep filelist{f}];
    end

    filenamelist=[filenamelist filelist];
end

filesep returns the directory separator for the platform on which MATLAB is running.

This gives you a list of filenames with full paths in the cell array filenamelist. Not the neatest solution, I know.

Change Text Color of Selected Option in a Select Box

You could do it like this.

jsFiddle

JS

var select = document.getElementById('mySelect');
select.onchange = function () {
    select.className = this.options[this.selectedIndex].className;
}

CSS

.redText {
    background-color:#F00;
}
.greenText {
    background-color:#0F0;
}
.blueText {
    background-color:#00F;
}

You could use option { background-color: #FFF; } if you want the list to be white.

HTML

<select id="mySelect" class="greenText">
    <option class="greenText" value="apple" >Apple</option>
    <option class="redText"   value="banana" >Banana</option>
    <option class="blueText" value="grape" >Grape</option>
</select>

Since this is a select it doesn't really make sense to use .yellowText as none selected if that's what you were getting at as something must be selected.

Lotus Notes email as an attachment to another email

If you are using Lotus Notes V9.X, it is better to drag the mail to desktop as .eml and then attach it to the mail. Safest way so far.

How to load data to hive from HDFS without removing the source file?

I found that, when you use EXTERNAL TABLE and LOCATION together, Hive creates table and initially no data will present (assuming your data location is different from the Hive 'LOCATION').

When you use 'LOAD DATA INPATH' command, the data get MOVED (instead of copy) from data location to location that you specified while creating Hive table.

If location is not given when you create Hive table, it uses internal Hive warehouse location and data will get moved from your source data location to internal Hive data warehouse location (i.e. /user/hive/warehouse/).

segmentation fault : 11

Run your program with valgrind of linked to efence. That will tell you where the pointer is being dereferenced and most likely fix your problem if you fix all the errors they tell you about.

How do I stretch a background image to cover the entire HTML element?

Not sure that stretching a background image is possible. If you find that it's not possible, or not reliable in all of your target browsers, you could try using a stretched img tag with z-index set lower, and position set to absolute so that other content appears on top of it.

Let us know what you end up doing.

Edit: What I suggested is basically what's in gabriel's link. So try that :)

Angular - res.json() is not a function

You can remove the entire line below:

 .map((res: Response) => res.json());

No need to use the map method at all.

Difference between Amazon EC2 and AWS Elastic Beanstalk

First off, EC2 and Elastic Compute Cloud are the same thing.

Next, AWS encompasses the range of Web Services that includes EC2 and Elastic Beanstalk. It also includes many others such as S3, RDS, DynamoDB, and all the others.

EC2

EC2 is Amazon's service that allows you to create a server (AWS calls these instances) in the AWS cloud. You pay by the hour and only what you use. You can do whatever you want with this instance as well as launch n number of instances.

Elastic Beanstalk

Elastic Beanstalk is one layer of abstraction away from the EC2 layer. Elastic Beanstalk will setup an "environment" for you that can contain a number of EC2 instances, an optional database, as well as a few other AWS components such as a Elastic Load Balancer, Auto-Scaling Group, Security Group. Then Elastic Beanstalk will manage these items for you whenever you want to update your software running in AWS. Elastic Beanstalk doesn't add any cost on top of these resources that it creates for you. If you have 10 hours of EC2 usage, then all you pay is 10 compute hours.

Running Wordpress

For running Wordpress, it is whatever you are most comfortable with. You could run it straight on a single EC2 instance, you could use a solution from the AWS Marketplace, or you could use Elastic Beanstalk.

What to pick?

In the case that you want to reduce system operations and just focus on the website, then Elastic Beanstalk would be the best choice for that. Elastic Beanstalk supports a PHP stack (as well as others). You can keep your site in version control and easily deploy to your environment whenever you make changes. It will also setup an Autoscaling group which can spawn up more EC2 instances if traffic is growing.

Here's the first result off of Google when searching for "elastic beanstalk wordpress": https://www.otreva.com/blog/deploying-wordpress-amazon-web-services-aws-ec2-rds-via-elasticbeanstalk/

working with negative numbers in python

Too hard? Your TA is... well, the phrase would probably get me banned. Anyways, check to see if numb is negative. If it is then multiply numa by -1 and do numb = abs(numb). Then do the loop.

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled

It seems to me that your Hibernate libraries are not found (NoClassDefFoundError: org/hibernate/boot/archive/scan/spi/ScanEnvironment as you can see above).

Try checking to see if Hibernate core is put in as dependency:

<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-core</artifactId>
  <version>5.0.11.Final</version>
  <scope>compile</scope>
</dependency>

Getting the HTTP Referrer in ASP.NET

Request.Headers["Referer"]

Explanation

The Request.UrlReferer property will throw a System.UriFormatException if the referer HTTP header is malformed (which can happen since it is not usually under your control).

Therefore, the Request.UrlReferer property is not 100% reliable - it may contain data that cannot be parsed into a Uri class. To ensure the value is always readable, use Request.Headers["Referrer"] instead.

As for using Request.ServerVariables as others here have suggested, per MSDN:

Request.ServerVariables Collection

The ServerVariables collection retrieves the values of predetermined environment variables and request header information.

Request.Headers Property

Gets a collection of HTTP headers.

Request.Headers is a better choice than Request.ServerVariables, since Request.ServerVariables contains all of the environment variables as well as the headers, where Request.Headers is a much shorter list that only contains the headers.

So the most reliable solution is to use the Request.Headers collection to read the value directly. Do heed Microsoft's warnings about HTML encoding the value if you are going to display it on a form, though.

Syntax error near unexpected token 'fi'

The first problem with your script is that you have to put a space after the [.
Type type [ to see what is really happening. It should tell you that [ is an alias to test command, so [ ] in bash is not some special syntax for conditionals, it is just a command on its own. What you should prefer in bash is [[ ]]. This common pitfall is greatly explained here and here.

Another problem is that you didn't quote "$f" which might become a problem later. This is explained here

You can use arithmetic expressions in if, so you don't have to use [ ] or [[ ]] at all in some cases. More info here

Also there's no need to use \n in every echo, because echo places newlines by default. If you want TWO newlines to appear, then use echo -e 'start\n' or echo $'start\n' . This $'' syntax is explained here

To make it completely perfect you should place -- before arbitrary filenames, otherwise rm might treat it as a parameter if the file name starts with dashes. This is explained here.

So here's your script:

#!/bin/bash
echo "start"
for f in *.jpg
do
    fname="${f##*/}"
    echo "fname is $fname"
    if (( fname % 2 == 1 )); then
        echo "removing $fname"
        rm -- "$f"
    fi
done

Is there a pure CSS way to make an input transparent?

I like to do this

input[type="text"]
{
    background: rgba(0, 0, 0, 0);
    border: none;
    outline: none;
}

Setting the outline property to none stops the browser from highlighting the box when the cursor enters

Cell spacing in UICollectionView

My solution in Swift 3 cell line spacing like in Instagram:

enter image description here

lazy var collectionView: UICollectionView = {
    let layout = UICollectionViewFlowLayout()
    let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
    cv.backgroundColor = UIColor.rgb(red: 227, green: 227, blue: 227)
    cv.showsVerticalScrollIndicator = false
    layout.scrollDirection = .vertical
    layout.minimumLineSpacing = 1
    layout.minimumInteritemSpacing = 1
    return cv
}()

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

    switch UIDevice.current.modelName {
    case "iPhone 4":
        return CGSize(width: 106, height: 106)
    case "iPhone 5":
        return CGSize(width: 106, height: 106)
    case "iPhone 6,7":
        return CGSize(width: 124, height: 124)
    case "iPhone Plus":
        return CGSize(width: 137, height: 137)
    default:
        return CGSize(width: frame.width / 3, height: frame.width / 3)
    }
}

How to detect device programmaticlly: https://stackoverflow.com/a/26962452/6013170

Javascript: console.log to html

You can override the default implementation of console.log()

(function () {
    var old = console.log;
    var logger = document.getElementById('log');
    console.log = function (message) {
        if (typeof message == 'object') {
            logger.innerHTML += (JSON && JSON.stringify ? JSON.stringify(message) : message) + '<br />';
        } else {
            logger.innerHTML += message + '<br />';
        }
    }
})();

Demo: Fiddle

How to remove all white space from the beginning or end of a string?

String.Trim() removes all whitespace from the beginning and end of a string. To remove whitespace inside a string, or normalize whitespace, use a Regular Expression.

How to get the last character of a string in a shell?

That's one of the reasons why you need to quote your variables:

echo "${str:$i:1}"

Otherwise, bash expands the variable and in this case does globbing before printing out. It is also better to quote the parameter to the script (in case you have a matching filename):

sh lash_ch.sh 'abcde*'

Also see the order of expansions in the bash reference manual. Variables are expanded before the filename expansion.

To get the last character you should just use -1 as the index since the negative indices count from the end of the string:

echo "${str: -1}"

The space after the colon (:) is REQUIRED.

This approach will not work without the space.

Reading a cell value in Excel vba and write in another Cell

surely you can do this with worksheet formulas, avoiding VBA entirely:

so for this value in say, column AV S:1 P:0 K:1 Q:1

you put this formula in column BC:

=MID(AV:AV,FIND("S",AV:AV)+2,1)

then these formulas in columns BD, BE...

=MID(AV:AV,FIND("P",AV:AV)+2,1)
=MID(AV:AV,FIND("K",AV:AV)+2,1)
=MID(AV:AV,FIND("Q",AV:AV)+2,1)

so these formulas look for the values S:1, P:1 etc in column AV. If the FIND function returns an error, then 0 is returned by the formula, else 1 (like an IF, THEN, ELSE

Then you would just copy down the formulas for all the rows in column AV.

HTH Philip

Powershell script does not run via Scheduled Tasks

Found successful workaround that is applicable for my scenario:

Don't log off, just lock the session!

Since this script is running on a Domain Controller, I am logging in to the server via the Remote Desktop console and then log off of the server to terminate my session. When setting up the Task in the Task Scheduler, I was using user accounts and local services that did not have access to run in an offline mode, or logon strictly to run a script.

Thanks to some troubleshooting assistance from Cole, I got to thinking about the RunAs function and decided to try and work around the non-functioning logons.

Starting in the Task Scheduler, I deleted my manually created Tasks. Using the new function in Server 2008 R2, I navigated to a 4740 Security Event in the Event Viewer, and used the right-click > Attach Task to this Event... and followed the prompts, pointing to my script on the Action page. After the Task was created, I locked my session and terminated my Remote Desktop Console connection. WIth the profile 'Locked' and not logged off, everything works like it should.

How do you remove the title text from the Android ActionBar?

getSupportActionBar().setDisplayShowTitleEnabled(false);
    getSupportActionBar().hide();

hope this will help

Facebook Android Generate Key Hash

In order to generate key hash you need to follow some easy steps.

1) Download Openssl from: here.

2) Make a openssl folder in C drive

3) Extract Zip files into this openssl folder created in C Drive.

4) Copy the File debug.keystore from .android folder in my case (C:\Users\SYSTEM.android) and paste into JDK bin Folder in my case (C:\Program Files\Java\jdk1.6.0_05\bin)

5) Open command prompt and give the path of JDK Bin folder in my case (C:\Program Files\Java\jdk1.6.0_05\bin).

6) Copy the following code and hit enter

keytool -exportcert -alias androiddebugkey -keystore debug.keystore > c:\openssl\bin\debug.txt

7) Now you need to enter password, Password = android.

8) If you see in openssl Bin folder, you will get a file with the name of debug.txt

9) Now either you can restart command prompt or work with existing command prompt

10) get back to C drive and give the path of openssl Bin folder

11) copy the following code and paste

openssl sha1 -binary debug.txt > debug_sha.txt

12) you will get debug_sha.txt in openssl bin folder

13) Again copy following code and paste

openssl base64 -in debug_sha.txt > debug_base64.txt

14) you will get debug_base64.txt in openssl bin folder

15) open debug_base64.txt file Here is your Key hash.

pip installs packages successfully, but executables not found from command line

I know the question asks about macOS, but here is a solution for Linux users who arrive here via Google.

I was having the issue described in this question, having installed the pdfx package via pip.

When I ran it however, nothing...

pip list | grep pdfx
pdfx (1.3.0)

Yet:

which pdfx
pdfx not found

The problem on Linux is that pip install ... drops scripts into ~/.local/bin and this is not on the default Debian/Ubuntu $PATH.

Here's a GitHub issue going into more detail: https://github.com/pypa/pip/issues/3813

To fix, just add ~/.local/bin to your $PATH, for example by adding the following line to your .bashrc file:

export PATH="$HOME/.local/bin:$PATH"

After that, restart your shell and things should work as expected.

How to get a date in YYYY-MM-DD format from a TSQL datetime field?

If you want to use it as a date instead of a varchar again afterwards, don't forget to convert it back:

select convert(datetime,CONVERT(char(10), GetDate(),126))

failed to load ad : 3

I hadn't published a version of my app with ads yet.

I was seeing error code 3: ERROR_CODE_NO_FILL after I switched from emulators with a debug version to a real device with the release version (installed through adb shell commands).

I waited 12+ hours and I could see ad requests on the AdMob portal, but no matches (match rate of 0%). I went to the Play Console > Store Presence > Pricing & distribution and switched the radio button for Contains ads to Yes, it has ads. I even tried uploading my app bundle (without publishing) to the Play Console. Neither of these worked.

Various AdMob help articles (including the one linked below) mention that if you've been seeing test ads (ads labeled with "Test Ad"), then your code is working and real ads should work as expected (once they build up inventory).

With that in mind, I went ahead and published my app to the Play Store and once the update was live, I downloaded it via the Play Store app on my real phone and the ads loaded no problem and my match rate is now sitting at 66% on AdMob. From the AdMob FAQ article, it sounds like it typically takes a few hours and could have taken up to 24 hours for ads to start showing.

ad mob FAQ re: how long does it take ads to show

Source: https://support.google.com/admob/answer/2993019?hl=en

Reactive forms - disabled attribute

this.form.disable()
this.form.enable()

For one formcontrol makes disable

this.form.get('first').disable()
this.form.get('first').enable()

Or initial set method.

first: new FormControl({disabled: true}, Validators.required)

How to update gradle in android studio?

after release of android studio v 3.0(stable), It will show popup, If gradle update is available

OR

Manually, just change version of gradle in top-level(project-level) build.gradle file to latest,

   buildscript {
      ...
      dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
      }
    }

check below chart

The Android Gradle Plugin and Gradle

 Android Gradle Plugin            Requires Gradle
 1.0.0 - 1.1.3                    2.2.1 - 2.3
 1.2.0 - 1.3.1                    2.2.1 - 2.9
 1.5.0   2.2.1+                   2.2.1 - 2.13
 2.0.0 - 2.1.2                    2.10  - 2.13
 2.1.3 - 2.2.3                    2.14.1+
 2.3.0+                           3.3+
 3.0.0+                           4.1+    
 3.1.0+                           4.4+    
 3.2.0 - 3.2.1                    4.6+    
 3.3.0 - 3.3.1                    4.10.1+ 
 3.4.0 - 3.4.1                    5.1.1+
 3.5.0                            5.4.1+

check gradle revisions

How to hide columns in HTML table?

Kos's answer is almost right, but can have damaging side effects. This is more correct:

#myTable tr td:nth-child(1), #myTable th:nth-child(1) {
    display: none;
}

CSS (Cascading Style Sheets) will cascade attributes to all of its children. This means that *:nth-child(1) will hide the first td of each tr AND hide the first element of all td children. If any of your td have things like buttons, icons, inputs, or selects, the first one will be hidden (woops!).

Even if you don't currently have things that will be hidden, image your frustration down the road if you need to add one. Don't punish your future self like that, that's going to be a pain to debug!

My answer will only hide the first td and th on all tr in #myTable keeping your other elements safe.

MySql Inner Join with WHERE clause

You could only write one where clause.

 SELECT table1.f_id  FROM table1
 INNER JOIN table2
 ON table2.f_id = table1.f_id
 where table1.f_com_id = '430' AND      
 table1.f_status = 'Submitted' AND table2.f_type = 'InProcess'

Moving from position A to position B slowly with animation

I don't understand why other answers are about relative coordinates change, not absolute like OP asked in title.

$("#Friends").animate( {top:
  "-=" + (parseInt($("#Friends").css("top")) - 100) + "px"
} );

Before and After Suite execution hook in jUnit 4.x

If you don't want to create a suite and have to list all your test classes you can use reflection to find the number of test classes dynamically and count down in a base class @AfterClass to do the tearDown only once:

public class BaseTestClass
{
    private static int testClassToRun = 0;

    // Counting the classes to run so that we can do the tear down only once
    static {
        try {
            Field field = ClassLoader.class.getDeclaredField("classes");
            field.setAccessible(true);

            @SuppressWarnings({ "unchecked", "rawtypes" })
            Vector<Class> classes = (Vector<Class>) field.get(BlockJUnit4ClassRunner.class.getClassLoader());
            for (Class<?> clazz : classes) {
                if (clazz.getName().endsWith("Test")) {
                    testClassToRun++;
                }
            }
        } catch (Exception ignore) {
        }
    }

    // Setup that needs to be done only once
    static {
        // one time set up
    }

    @AfterClass
    public static void baseTearDown() throws Exception
    {
        if (--testClassToRun == 0) {
            // one time clean up
        }
    }
}

If you prefer to use @BeforeClass instead of the static blocks, you can also use a boolean flag to do the reflection count and test setup only once at the first call. Hope this helps someone, it took me an afternoon to figure out a better way than enumerating all classes in a suite.

Now all you need to do is extend this class for all your test classes. We already had a base class to provide some common stuff for all our tests so this was the best solution for us.

Inspiration comes from this SO answer https://stackoverflow.com/a/37488620/5930242

If you don't want to extend this class everywhere, this last SO answer might do what you want.

How to request Location Permission at runtime

check this code from MainActivity

 // Check location permission is granted - if it is, start
// the service, otherwise request the permission
fun checkOrAskLocationPermission(callback: () -> Unit) {
    // Check GPS is enabled
    val lm = getSystemService(Context.LOCATION_SERVICE) as LocationManager
    if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        Toast.makeText(this, "Please enable location services", Toast.LENGTH_SHORT).show()
        buildAlertMessageNoGps(this)
        return
    }

    // Check location permission is granted - if it is, start
    // the service, otherwise request the permission
    val permission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
    if (permission == PackageManager.PERMISSION_GRANTED) {
        callback.invoke()
    } else {
        // callback will be inside the activity's onRequestPermissionsResult(
        ActivityCompat.requestPermissions(
            this,
            arrayOf(Manifest.permission.ACCESS_FINE_LOCATION),
            PERMISSIONS_REQUEST
        )
    }
}

plus

   override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    if (requestCode == PERMISSIONS_REQUEST) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED){
              // Permission ok. Do work.
         }
    }
}

plus

 fun buildAlertMessageNoGps(context: Context) {
    val builder = AlertDialog.Builder(context);
    builder.setMessage("Your GPS is disabled. Do you want to enable it?")
        .setCancelable(false)
        .setPositiveButton("Yes") { _, _ -> context.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS)) }
        .setNegativeButton("No") { dialog, _ -> dialog.cancel(); }
    val alert = builder.create();
    alert.show();
}

usage

checkOrAskLocationPermission() {
            // Permission ok. Do work.
        }

Using Java generics for JPA findAll() query with WHERE clause

This will work, and if you need where statement you can add it as parameter.

class GenericDAOWithJPA<T, ID extends Serializable> {

.......

public List<T> findAll() {
            return entityManager.createQuery("Select t from " + persistentClass.getSimpleName() + " t").getResultList();
    }
}

Making an svg image object clickable with onclick, avoiding absolute positioning

When embedding same-origin SVGs using <object>, you can access the internal contents using objectElement.contentDocument.rootElement. From there, you can easily attach event handlers (e.g. via onclick, addEventListener(), etc.)

For example:

var object = /* get DOM node for <object> */;
var svg = object.contentDocument.rootElement;
svg.addEventListener('click', function() {
  console.log('hooray!');
});

Note that this is not possible for cross-origin <object> elements unless you also control the <object> origin server and can set CORS headers there. For cross-origin cases without CORS headers, access to contentDocument is blocked.

Slide a layout up from bottom of screen

My code to make animation slide up, slide down without XML

private static ObjectAnimator createBottomUpAnimation(View view,
        AnimatorListenerAdapter listener, float distance) {
    ObjectAnimator animator = ObjectAnimator.ofFloat(view, "translationY", -distance);
//        animator.setDuration(???)
    animator.removeAllListeners();
    if (listener != null) {
        animator.addListener(listener);
    }
    return animator;
}

public static ObjectAnimator createTopDownAnimation(View view, AnimatorListenerAdapter listener,
        float distance) {
    view.setTranslationY(-distance);
    ObjectAnimator animator = ObjectAnimator.ofFloat(view, "translationY", 0);
    animator.removeAllListeners();
    if (listener != null) {
        animator.addListener(listener);
    }
    return animator;
}

Using For slide down

createTopDownAnimation(myYellowView, null, myYellowView.getHeight()).start();

For slide up

createBottomUpAnimation(myYellowView, null, myYellowView.getHeight()).start();

enter image description here

How to put labels over geom_bar for each bar in R with ggplot2

To add to rcs' answer, if you want to use position_dodge() with geom_bar() when x is a POSIX.ct date, you must multiply the width by 86400, e.g.,

ggplot(data=dat, aes(x=Types, y=Number, fill=sample)) + 
 geom_bar(position = "dodge", stat = 'identity') +
 geom_text(aes(label=Number), position=position_dodge(width=0.9*86400), vjust=-0.25)

Object Required Error in excel VBA

In order to set the value of integer variable we simply assign the value to it. eg g1val = 0 where as set keyword is used to assign value to object.

Sub test()

Dim g1val, g2val As Integer

  g1val = 0
  g2val = 0

    For i = 3 To 18

     If g1val > Cells(33, i).Value Then
        g1val = g1val
    Else
       g1val = Cells(33, i).Value
     End If

    Next i

    For j = 32 To 57
        If g2val > Cells(31, j).Value Then
           g2val = g2val
        Else
          g2val = Cells(31, j).Value
        End If
    Next j

End Sub

How to disable submit button once it has been clicked?

the trick is to delayed the button to be disabled, and submit the form you can use window.setTimeout('this.disabled=true',0); yes even with 0 MS is working

How to Select a substring in Oracle SQL up to a specific character?

SELECT REGEXP_SUBSTR('STRING_EXAMPLE','[^_]+',1,1)  from dual

is the right answer, as posted by user1717270

If you use INSTR, it will give you the position for a string that assumes it contains "_" in it. What if it doesn't? Well the answer will be 0. Therefore, when you want to print the string, it will print a NULL. Example: If you want to remove the domain from a "host.domain". In some cases you will only have the short name, i.e. "host". Most likely you would like to print "host". Well, with INSTR it will give you a NULL because it did not find any ".", i.e. it will print from 0 to 0. With REGEXP_SUBSTR you will get the right answer in all cases:

SELECT REGEXP_SUBSTR('HOST.DOMAIN','[^.]+',1,1)  from dual;

HOST

and

SELECT REGEXP_SUBSTR('HOST','[^.]+',1,1)  from dual;

HOST

how to increase java heap memory permanently?

This worked for me:

export _JAVA_OPTIONS="-Xmx1g"

It's important that you have no spaces because for me it did not work. I would suggest just copying and pasting. Then I ran:

java -XshowSettings:vm

and it will tell you:

Picked up _JAVA_OPTIONS: -Xmx1g

What's the best way to determine the location of the current PowerShell script?

I always use this little snippet which works for PowerShell and ISE the same way:

# Set active path to script-location:
$path = $MyInvocation.MyCommand.Path
if (!$path) {
    $path = $psISE.CurrentFile.Fullpath
}
if ($path) {
    $path = Split-Path $path -Parent
}
Set-Location $path

Angular routerLink does not navigate to the corresponding component

There is also another case which suits this situation. If in your interceptor, you made it return non Boolean value, the end result is like that.

For example, I had tried to return obj && obj[key] stuff. After debugging for a while, then I realize I have to convert this to Boolean type manually like Boolean(obj && obj[key]) in order to let the clicking pass.

What is the best alternative IDE to Visual Studio

Try out this one: "Pao" at http://pao-ide.info . It's still in development and not up to production use but it's quite unique in features. Basically, all the language constructs, such as assemblies, types, members, statements, expressions are treated as objects and are associated with rich operation options. You can enjoy features usually seen in graphical editors, such as multiple selection, multiple copy-paste, tagging, batch operation and very powerful search capability. It takes some getting used to but eventually might increase productivity. Right now, it only supports form applications though.

BeautifulSoup getText from between <p>, not picking up subsequent paragraphs

This works well for specific articles where the text is all wrapped in <p> tags. Since the web is an ugly place, it's not always the case.

Often, websites will have text scattered all over, wrapped in different types of tags (e.g. maybe in a <span> or a <div>, or an <li>).

To find all text nodes in the DOM, you can use soup.find_all(text=True).

This is going to return some undesired text, like the contents of <script> and <style> tags. You'll need to filter out the text contents of elements you don't want.

blacklist = [
  'style',
  'script',
  # other elements,
]

text_elements = [t for t in soup.find_all(text=True) if t.parent.name not in blacklist]

If you are working with a known set of tags, you can tag the opposite approach:

whitelist = [
  'p'
]

text_elements = [t for t in soup.find_all(text=True) if t.parent.name in whitelist]

Which Radio button in the group is checked?

If you want to get the index of the selected radio button inside a control you can use this method:

public static int getCheckedRadioButton(Control c)
{
    int i;
    try
    {
        Control.ControlCollection cc = c.Controls;
        for (i = 0; i < cc.Count; i++)
        {
            RadioButton rb = cc[i] as RadioButton;
            if (rb.Checked)
            {
                return i;
            }
        }
    }
    catch
    {
        i = -1;
    }
    return i;
}

Example use:

int index = getCheckedRadioButton(panel1);

The code isn't that well tested, but it seems the index order is from left to right and from top to bottom, as when reading a text. If no radio button is found, the method returns -1.

Update: It turned out my first attempt didn't work if there's no radio button inside the control. I added a try and catch block to fix that, and the method now seems to work.

Can an Android App connect directly to an online mysql database

Yes you can do that.

Materials you need:

  1. WebServer
  2. A Database Stored in the webserver
  3. And a little bit android knowledge :)
  4. Webservices (json ,Xml...etc) whatever you are comfortable with

1. First set the internet permissions in your manifest file

 <uses-permission android:name="android.permission.INTERNET" />

2. Make a class to make an HTTPRequest from the server (i am using json parisng to get the values)

for eg:

    public class JSONfunctions {

    public static JSONObject getJSONfromURL(String url) {
        InputStream is = null;
        String result = "";
        JSONObject jArray = null;

        // Download JSON data from URL
        try {
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost(url);
            HttpResponse response = httpclient.execute(httppost);
            HttpEntity entity = response.getEntity();
            is = entity.getContent();

        } catch (Exception e) {
            Log.e("log_tag", "Error in http connection " + e.toString());
        }

        // Convert response to string
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            result = sb.toString();
        } catch (Exception e) {
            Log.e("log_tag", "Error converting result " + e.toString());
        }

        try {

            jArray = new JSONObject(result);
        } catch (JSONException e) {
            Log.e("log_tag", "Error parsing data " + e.toString());
        }

        return jArray;
    }
}

3. In your MainActivity Make an object of the class JsonFunctions and pass the url as an argument from where you want to get the data

eg:

JSONObject jsonobject;

jsonobject = JSONfunctions.getJSONfromURL("http://YOUR_DATABASE_URL");

4. And then finally read the jsontags and store the values in an arraylist and later show it in listview if you want

and if you have any problem you can follow this blog he gives excellent android tutorials AndroidHive

Since the above answer i wrote was long back and now HttpClient, HttpPost,HttpEntity have been removed in Api 23. You can use the below code in the build.gradle(app-level) to still continue using org.apache.httpin your project.

android {
    useLibrary 'org.apache.http.legacy'
    signingConfigs {}
    buildTypes {}
}

or You can use HttpURLConnection like below to get your response from server

public String getJSON(String url, int timeout) {
HttpURLConnection c = null;
try {
    URL u = new URL(url);
    c = (HttpURLConnection) u.openConnection();
    c.setRequestMethod("GET");
    c.setRequestProperty("Content-length", "0");
    c.setUseCaches(false);
    c.setAllowUserInteraction(false);
    c.setConnectTimeout(timeout);
    c.setReadTimeout(timeout);
    c.connect();
    int status = c.getResponseCode();

    switch (status) {
        case 200:
        case 201:
            BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream()));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line+"\n");
            }
            br.close();
            return sb.toString();
    }

} catch (MalformedURLException ex) {
    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
    Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
} finally {
   if (c != null) {
      try {
          c.disconnect();
      } catch (Exception ex) {
         Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, ex);
      }
   }
}
return null;

}

or You can use 3rd party Library like Volley, Retrofit to call the webservice api and get the response and later parse it with using FasterXML-jackson, google-gson.

What is the correct way to start a mongod service on linux / OS X?

First Step

install mongodb in your linux machine with

apt install mongodb-client && apt install mongodb-server

second step is

change the database path instead of your system default path if you want.
so do the following steps and change it for yourself.

mongod --directoryperdb --dbpath /var/lib/mongodb/data/db --logpath /var/lib/mongodb/log/mongodb.log --logappend --rest

and in your windows machine do it just like that just put an --install flag. you have to get a successful message.

Best Regards...

How do a LDAP search/authenticate against this LDAP in Java

try {
    LdapContext ctx = new InitialLdapContext(env, null);
    ctx.setRequestControls(null);
    NamingEnumeration<?> namingEnum = ctx.search("ou=people,dc=example,dc=com", "(objectclass=user)", getSimpleSearchControls());
    while (namingEnum.hasMore ()) {
        SearchResult result = (SearchResult) namingEnum.next ();    
        Attributes attrs = result.getAttributes ();
        System.out.println(attrs.get("cn"));

    } 
    namingEnum.close();
} catch (Exception e) {
    e.printStackTrace();
}

private SearchControls getSimpleSearchControls() {
    SearchControls searchControls = new SearchControls();
    searchControls.setSearchScope(SearchControls.SUBTREE_SCOPE);
    searchControls.setTimeLimit(30000);
    //String[] attrIDs = {"objectGUID"};
    //searchControls.setReturningAttributes(attrIDs);
    return searchControls;
}

What's the difference between <b> and <strong>, <i> and <em>?

I use both <strong> and <b>, actually, for exactly the reasons mentioned in this thread of responses. There are times when bold-facing some text simply looks better, but it isn't, necessarily, semantically more important than the rest of the sentence. Here's an example from a page I'm working on right now:

"Retrieves <strong>all</strong> books about <b>lacrosse</b>."

In that sentence, the word "all" is very important, and "lacrosse" less so--I merely wanted it bold because it represents a search term, so I wanted some visual separation. If you're viewing the page with a screen reader, I really don't think it needs to go out of the way to emphasize the word "lacrosse".

I would tend to imagine that most web developers use one of the other, but both are fine--<b> is most definitely not deprecated, as some people have claimed. For me, it's just a fine line between visual appeal and meaning.

What is the 'override' keyword in C++ used for?

The override keyword serves two purposes:

  1. It shows the reader of the code that "this is a virtual method, that is overriding a virtual method of the base class."
  2. The compiler also knows that it's an override, so it can "check" that you are not altering/adding new methods that you think are overrides.

To explain the latter:

class base
{
  public:
    virtual int foo(float x) = 0; 
};


class derived: public base
{
   public:
     int foo(float x) override { ... } // OK
}

class derived2: public base
{
   public:
     int foo(int x) override { ... } // ERROR
};

In derived2 the compiler will issue an error for "changing the type". Without override, at most the compiler would give a warning for "you are hiding virtual method by same name".

How can I convert String[] to ArrayList<String>

You can do the following:

String [] strings = new String [] {"1", "2" };
List<String> stringList = new ArrayList<String>(Arrays.asList(strings)); //new ArrayList is only needed if you absolutely need an ArrayList

Pass Multiple Parameters to jQuery ajax call

Don't use string concatenation to pass parameters, just use a data hash:

$.ajax({
    type: 'POST',
    url: 'popup.aspx/GetJewellerAssets',
    contentType: 'application/json; charset=utf-8',
    data: { jewellerId: filter, locale: 'en-US' },
    dataType: 'json',
    success: AjaxSucceeded,
    error: AjaxFailed
});

UPDATE:

As suggested by @Alex in the comments section, an ASP.NET PageMethod expects parameters to be JSON encoded in the request, so JSON.stringify should be applied on the data hash:

$.ajax({
    type: 'POST',
    url: 'popup.aspx/GetJewellerAssets',
    contentType: 'application/json; charset=utf-8',
    data: JSON.stringify({ jewellerId: filter, locale: 'en-US' }),
    dataType: 'json',
    success: AjaxSucceeded,
    error: AjaxFailed
});

How to open mail app from Swift

Updated answer from Stephen Groom for Swift 3

let email = "[email protected]"
let url = URL(string: "mailto:\(email)")
UIApplication.shared.openURL(url!)

HTML5 : Iframe No scrolling?

In HTML5 there is no scrolling attribute because "its function is better handled by CSS" see http://www.w3.org/TR/html5-diff/ for other changes. Well and the CSS solution:

CSS solution:

HTML4's scrolling="no" is kind of an alias of the CSS's overflow: hidden, to do so it is important to set size attributes width/height:

iframe.noScrolling{
  width: 250px; /*or any other size*/
  height: 300px; /*or any other size*/
  overflow: hidden;
}

Add this class to your iframe and you're done:

<iframe src="http://www.example.com/" class="noScrolling"></iframe>

! IMPORTANT NOTE ! : overflow: hidden for <iframe> is not fully supported by all modern browsers yet(even chrome doesn't support it yet) so for now (2013) it's still better to use Transitional version and use scrolling="no" and overflow:hidden at the same time :)

UPDATE 2020: the above is still true, oveflow for iframes is still not supported by all majors

Quickest way to clear all sheet contents VBA

Try this one:

Sub clear_sht
  Dim sht As Worksheet
  Set sht = Worksheets(GENERATOR_SHT_NAME)
  col_cnt = sht.UsedRange.Columns.count
  If col_cnt = 0 Then
    col_cnt = 1
  End If

  sht.Range(sht.Cells(1, 1), sht.Cells(sht.UsedRange.Rows.count, col_cnt)).Clear
End Sub

Conversion between UTF-8 ArrayBuffer and String

Using TextEncoder and TextDecoder

var uint8array = new TextEncoder("utf-8").encode("Plain Text");
var string = new TextDecoder().decode(uint8array);
console.log(uint8array ,string )

How do I retrieve a textbox value using JQuery?

Just Additional Info which took me long time to find.what if you were using the field name and not id for identifying the form field. You do it like this:

For radio button:

var inp= $('input:radio[name=PatientPreviouslyReceivedDrug]:checked').val();

For textbox:

var txt=$('input:text[name=DrugDurationLength]').val();

How to insert an item at the beginning of an array in PHP?

For an associative array you can just use merge.

$arr = array('item2', 'item3', 'item4');
$arr = array_merge(array('item1'), $arr)

Get file version in PowerShell

Here an alternative method. It uses Get-WmiObject CIM_DATAFILE to select the version.

(Get-WmiObject -Class CIM_DataFile -Filter "Name='C:\\Windows\\explorer.exe'" | Select-Object Version).Version

Sending credentials with cross-domain posts?

You can use the beforeSend callback to set additional parameters (The XMLHTTPRequest object is passed to it as its only parameter).

Just so you know, this type of cross-domain request will not work in a normal site scenario and not with any other browser. I don't even know what security limitations FF 3.5 imposes as well, just so you don't beat your head against the wall for nothing:

$.ajax({
    url: 'http://bar.other',
    data: { whatever:'cool' },
    type: 'GET',
    beforeSend: function(xhr){
       xhr.withCredentials = true;
    }
});

One more thing to beware of, is that jQuery is setup to normalize browser differences. You may find that further limitations are imposed by the jQuery library that prohibit this type of functionality.

Windows 7 - 'make' is not recognized as an internal or external command, operable program or batch file

'make' is a command for UNIX/Linux. Instead of it, use 'nmake' command in MS Windows. Or you'd better use an emulator like CYGWIN.

How to copy a file to another path?

Old Question,but I would like to add complete Console Application example, considering you have files and proper permissions for the given folder, here is the code

 class Program
 {
    static void Main(string[] args)
    {
        //path of file
        string pathToOriginalFile = @"E:\C-sharp-IO\test.txt";

        
        //duplicate file path 
        string PathForDuplicateFile = @"E:\C-sharp-IO\testDuplicate.txt";
         
          //provide source and destination file paths
        File.Copy(pathToOriginalFile, PathForDuplicateFile);

        Console.ReadKey();

    }
}

Source: File I/O in C# (Read, Write, Delete, Copy file using C#)

Render HTML to PDF in Django site

Try wkhtmltopdf with either one of the following wrappers

django-wkhtmltopdf or python-pdfkit

This worked great for me,supports javascript and css or anything for that matter which a webkit browser supports.

For more detailed tutorial please see this blog post

How to set <iframe src="..."> without causing `unsafe value` exception?

constructor(
 public sanitizer: DomSanitizer, ) {

 }

I had been struggling for 4 hours. the problem was in img tag. When you use square bracket to 'src' ex: [src]. you can not use this angular expression {{}}. you just give directly from an object example below. if you give angular expression {{}}. you will get interpolation error.

  1. first i used ngFor to iterate the countries

    *ngFor="let country of countries"
    
  2. second you put this in the img tag. this is it.

    <img [src]="sanitizer.bypassSecurityTrustResourceUrl(country.flag)"
    height="20" width="20" alt=""/>
    

Android YouTube app Play Video Intent

This will work on a device but not the emulator per Lemmy's answer.

startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.youtube.com/watch?v=cxLG2wtE7TM")));

How to check if $_GET is empty?

Just to provide some variation here: You could check for

if ($_SERVER["QUERY_STRING"] == null)

it is completely identical to testing $_GET.

How do I use a file grep comparison inside a bash if/else statement?

From grep --help, but also see man grep:

Exit status is 0 if any line was selected, 1 otherwise; if any error occurs and -q was not given, the exit status is 2.

if grep --quiet MYSQL_ROLE=master /etc/aws/hosts.conf; then
  echo exists
else
  echo not found
fi

You may want to use a more specific regex, such as ^MYSQL_ROLE=master$, to avoid that string in comments, names that merely start with "master", etc.

This works because the if takes a command and runs it, and uses the return value of that command to decide how to proceed, with zero meaning true and non-zero meaning false—the same as how other return codes are interpreted by the shell, and the opposite of a language like C.

Exec : display stdout "live"

I have found it helpful to add a custom exec script to my utilities that do this.

utilities.js

const { exec } = require('child_process')

module.exports.exec = (command) => {
  const process = exec(command)

  process.stdout.on('data', (data) => {
    console.log('stdout: ' + data.toString())
  })

  process.stderr.on('data', (data) => {
    console.log('stderr: ' + data.toString())
  })

  process.on('exit', (code) => {
    console.log('child process exited with code ' + code.toString())
  })
}

app.js

const { exec } = require('./utilities.js')

exec('coffee -cw my_file.coffee')

Prevent Caching in ASP.NET MVC for specific actions using an attribute

You can use the built in cache attribute to prevent caching.

For .net Framework: [OutputCache(NoStore = true, Duration = 0)]

For .net Core: [ResponseCache(NoStore = true, Duration = 0)]

Be aware that it is impossible to force the browser to disable caching. The best you can do is provide suggestions that most browsers will honor, usually in the form of headers or meta tags. This decorator attribute will disable server caching and also add this header: Cache-Control: public, no-store, max-age=0. It does not add meta tags. If desired, those can be added manually in the view.

Additionally, JQuery and other client frameworks will attempt to trick the browser into not using it's cached version of a resource by adding stuff to the url, like a timestamp or GUID. This is effective in making the browser ask for the resource again but doesn't really prevent caching.

On a final note. You should be aware that resources can also be cached in between the server and client. ISP's, proxies, and other network devices also cache resources and they often use internal rules without looking at the actual resource. There isn't much you can do about these. The good news is that they typically cache for shorter time frames, like seconds or minutes.

Disable ONLY_FULL_GROUP_BY

I have noticed that @Eyo Okon Eyo solution works as long as MySQL server is not restarted, then defaults settings are restored. Here is a permanent solution that worked for me:

To remove particular SQL mode (in this case ONLY_FULL_GROUP_BY), find the current SQL mode:

SELECT @@GLOBAL.sql_mode;

copy the result and remove from it what you don't need (ONLY_FULL_GROUP_BY)

e.g.:

ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

to

STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

create and open this file:

/etc/mysql/conf.d/disable_strict_mode.cnf

and write and past into it your new SQL mode:

[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

restart MySQL:

sudo service mysql restart

Or you can use ANY_VALUE() to suppress ONLY_FULL_GROUP_BY value rejection, you can read more about it here

PostgreSQL - SQL state: 42601 syntax error

Your function would work like this:

CREATE OR REPLACE FUNCTION prc_tst_bulk(sql text)
RETURNS TABLE (name text, rowcount integer) AS 
$$
BEGIN

RETURN QUERY EXECUTE '
WITH v_tb_person AS (' || sql || $x$)
SELECT name, count(*)::int FROM v_tb_person WHERE nome LIKE '%a%' GROUP BY name
UNION
SELECT name, count(*)::int FROM v_tb_person WHERE gender = 1 GROUP BY name$x$;

END     
$$ LANGUAGE plpgsql;

Call:

SELECT * FROM prc_tst_bulk($$SELECT a AS name, b AS nome, c AS gender FROM tbl$$)
  • You cannot mix plain and dynamic SQL the way you tried to do it. The whole statement is either all dynamic or all plain SQL. So I am building one dynamic statement to make this work. You may be interested in the chapter about executing dynamic commands in the manual.

  • The aggregate function count() returns bigint, but you had rowcount defined as integer, so you need an explicit cast ::int to make this work

  • I use dollar quoting to avoid quoting hell.

However, is this supposed to be a honeypot for SQL injection attacks or are you seriously going to use it? For your very private and secure use, it might be ok-ish - though I wouldn't even trust myself with a function like that. If there is any possible access for untrusted users, such a function is a loaded footgun. It's impossible to make this secure.

Craig (a sworn enemy of SQL injection!) might get a light stroke, when he sees what you forged from his piece of code in the answer to your preceding question. :)

The query itself seems rather odd, btw. But that's beside the point here.

How to get ELMAH to work with ASP.NET MVC [HandleError] attribute?

A completely alternative solution is to not use the MVC HandleErrorAttribute, and instead rely on ASP.Net error handling, which Elmah is designed to work with.

You need to remove the default global HandleErrorAttribute from App_Start\FilterConfig (or Global.asax), and then set up an error page in your Web.config:

<customErrors mode="RemoteOnly" defaultRedirect="~/error/" />

Note, this can be an MVC routed URL, so the above would redirect to the ErrorController.Index action when an error occurs.

TypeError: '<=' not supported between instances of 'str' and 'int'

input() by default takes the input in form of strings.

if (0<= vote <=24):

vote takes a string input (suppose 4,5,etc) and becomes uncomparable.

The correct way is: vote = int(input("Enter your message")will convert the input to integer (4 to 4 or 5 to 5 depending on the input)

SyntaxError: Non-ASCII character '\xa3' in file when function returns '£'

Adding the following two lines in the script solved the issue for me.

# !/usr/bin/python
# coding=utf-8

Hope it helps !

The type initializer for 'Oracle.DataAccess.Client.OracleConnection' threw an exception

Easiest Way!!!

  1. Right click on project and select "Manage NuGet Packages..."
  2. Search for Oracle.ManagedDataAccess. Install it.

If you are using Entity Framework and your Visual Studio Version is 2012 or higher,then

  1. Again search for Oracle.ManagedDataAccess.EntityFramework. Install it.
  2. Use below name spaces in your .cs file:
    using Oracle.ManagedDataAccess.Client;
    using Oracle.ManagedDataAccess.EntityFramework;

Its done. Now restart your visual studio and build your code.

What do these packages do?
After installing these packages no additional Oracle client software is required to be installed to connect to database.

How to set the height of an input (text) field in CSS?

You use this style code

.heighttext{
 float:right;
 height:30px;
 width:70px;
 }

Split String by delimiter position using oracle SQL

You want to use regexp_substr() for this. This should work for your example:

select regexp_substr(val, '[^/]+/[^/]+', 1, 1) as part1,
       regexp_substr(val, '[^/]+$', 1, 1) as part2
from (select 'F/P/O' as val from dual) t

Here, by the way, is the SQL Fiddle.

Oops. I missed the part of the question where it says the last delimiter. For that, we can use regex_replace() for the first part:

select regexp_replace(val, '/[^/]+$', '', 1, 1) as part1,
       regexp_substr(val, '[^/]+$', 1, 1) as part2
from (select 'F/P/O' as val from dual) t

And here is this corresponding SQL Fiddle.

"use database_name" command in PostgreSQL

Use this commad when first connect to psql

=# psql <databaseName> <usernamePostgresql>

Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted

I researched on the internet and some answers includes enabling the "access for lesser app" and "unlocking gmail captcha" which sadly didn't work for me until I found the 2-step verification.

What I did the following was:

  1. enable the 2-step verification to google HERE

  2. Create App Password to be use by your system HERE

  3. I selected Others (custom name) and clicked generate

  4. Went to my env file in laravel and edited this

    [email protected]

    MAIL_PASSWORD=thepasswordgenerated

  5. Restarted my apache server and boom! It works again.

This was my solution. I created this to atleast make other people not go wasting their time researching for a possible answer.

How to get table list in database, using MS SQL 2008?

Answering the question in your title, you can query sys.tables or sys.objects where type = 'U' to check for the existence of a table. You can also use OBJECT_ID('table_name', 'U'). If it returns a non-null value then the table exists:

IF (OBJECT_ID('dbo.My_Table', 'U') IS NULL)
BEGIN
    CREATE TABLE dbo.My_Table (...)
END

You can do the same for databases with DB_ID():

IF (DB_ID('My_Database') IS NULL)
BEGIN
    CREATE DATABASE My_Database
END

If you want to create the database and then start using it, that needs to be done in separate batches. I don't know the specifics of your case, but there shouldn't be many cases where this isn't possible. In a SQL script you can use GO statements. In an application it's easy enough to send across a new command after the database is created.

The only place that you might have an issue is if you were trying to do this in a stored procedure and creating databases on the fly like that is usually a bad idea.

If you really need to do this in one batch, you can get around the issue by using EXEC to get around the parsing error of the database not existing:

CREATE DATABASE Test_DB2

IF (OBJECT_ID('Test_DB2.dbo.My_Table', 'U') IS NULL)
BEGIN
    EXEC('CREATE TABLE Test_DB2.dbo.My_Table (my_id INT)')
END

EDIT: As others have suggested, the INFORMATION_SCHEMA.TABLES system view is probably preferable since it is supposedly a standard going forward and possibly between RDBMSs.

Which characters are valid/invalid in a JSON key name?

It is worth mentioning that while starting the keys with numbers is valid, it could cause some unintended issues.

Example:

var testObject = {
    "1tile": "test value"
};
console.log(testObject.1tile); // fails, invalid syntax
console.log(testObject["1tile"]; // workaround

What is the difference between Forking and Cloning on GitHub?

In case you did what the questioner hinted at (forgot to fork and just locally cloned a repo, made changes and now need to issue a pull request) you can get back on track:

  1. fork the repo you want to send pull request to
  2. push your local changes to your remote
  3. issue pull request

SUM of grouped COUNT in SQL Query

You can use union to joining rows.

select Name, count(*) as Count from yourTable group by Name
union all
select "SUM" as Name, count(*) as Count from yourTable

how to add jquery in laravel project

To add jquery to laravel you first have to add the Scaffolded javascript file, app.js

This can easily be done adding this tag.

<script src="{{ asset('js/app.js') }}"></script>

There are two main procesess depending on the version but at the end of both you will have to execute:

npm run dev

That adds all the dependencies to the app.js file. But if you want this process to be done automatically for you, you can also run:

npm run watch

Wich will keep watching for changes and add them.

Version 5.*

jQuery is already included in this version of laravel as a dev dependency.

You just have to run:

npm install

This first command will install the dependencies. jquery will be added.

Version 6.* and 7*

jQuery has been taken out of laravel that means you need to import it manually.

I'll import it here as a development dependency:

npm i -D jquery

Then add it to the bootstrap.js file in resources/js/bootstrap.js You may notice that axios and lodash are imported there as well so in the same way we can import jquery.

Just add wherever you want there:

//In resources/js/bootstrap.js
window.$ = require('jquery');

If you follow this process in the 5.* version it won't affect laravel but it will install a more updated version of jquery.

How to determine equality for two JavaScript objects?

Here's a pretty clean CoffeeScript version of how you could do this:

Object::equals = (other) ->
  typeOf = Object::toString

  return false if typeOf.call(this) isnt typeOf.call(other)
  return `this == other` unless typeOf.call(other) is '[object Object]' or
                                typeOf.call(other) is '[object Array]'

  (return false unless this[key].equals other[key]) for key, value of this
  (return false if typeof this[key] is 'undefined') for key of other

  true

Here are the tests:

  describe "equals", ->

    it "should consider two numbers to be equal", ->
      assert 5.equals(5)

    it "should consider two empty objects to be equal", ->
      assert {}.equals({})

    it "should consider two objects with one key to be equal", ->
      assert {a: "banana"}.equals {a: "banana"}

    it "should consider two objects with keys in different orders to be equal", ->
      assert {a: "banana", kendall: "garrus"}.equals {kendall: "garrus", a: "banana"}

    it "should consider two objects with nested objects to be equal", ->
      assert {a: {fruit: "banana"}}.equals {a: {fruit: "banana"}}

    it "should consider two objects with nested objects that are jumbled to be equal", ->
      assert {a: {a: "banana", kendall: "garrus"}}.equals {a: {kendall: "garrus", a: "banana"}}

    it "should consider two objects with arrays as values to be equal", ->
      assert {a: ["apple", "banana"]}.equals {a: ["apple", "banana"]}



    it "should not consider an object to be equal to null", ->
      assert !({a: "banana"}.equals null)

    it "should not consider two objects with different keys to be equal", ->
      assert !({a: "banana"}.equals {})

    it "should not consider two objects with different values to be equal", ->
      assert !({a: "banana"}.equals {a: "grapefruit"})

How to run a function when the page is loaded?

Alternate solution. I prefer this for the brevity and code simplicity.

(function () {
    alert("I am here");
})();

This is an anonymous function, where the name is not specified. What happens here is that, the function is defined and executed together. Add this to the beginning or end of the body, depending on if it is to be executed before loading the page or soon after all the HTML elements are loaded.

How many times does each value appear in a column?

The quickest way would be with a pivot table. Make sure your column of data has a header row, highlight the data and the header, from the insert ribbon select pivot table and then drag your header from the pivot table fields list to the row labels and to the values boxes.

Store output of subprocess.Popen call in a string

I wrote a little function based on the other answers here:

def pexec(*args):
    return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].rstrip()

Usage:

changeset = pexec('hg','id','--id')
branch = pexec('hg','id','--branch')
revnum = pexec('hg','id','--num')
print('%s : %s (%s)' % (revnum, changeset, branch))

Can HTML checkboxes be set to readonly?

If you need the checkbox to be submitted with the form but effectively read-only to the user, I recommend setting them to disabled and using javascript to re-enable them when the form is submitted.

This is for two reasons. First and most important, your users benefit from seeing a visible difference between checkboxes they can change and checkboxes which are read-only. Disabled does this.

Second reason is that the disabled state is built into the browser so you need less code to execute when the user clicks on something. This is probably more of a personal preference than anything else. You'll still need some javascript to un-disable these when submitting the form.

It seems easier to me to use some javascript when the form is submitted to un-disable the checkboxes than to use a hidden input to carry the value.

How do you use the "WITH" clause in MySQL?

Mysql Developers Team announced that version 8.0 will have Common Table Expressions in MySQL (CTEs). So it will be possible to write queries like this:


WITH RECURSIVE my_cte AS
(
  SELECT 1 AS n
  UNION ALL
  SELECT 1+n FROM my_cte WHERE n<10
)
SELECT * FROM my_cte;
+------+
| n    |
+------+
|    1 |
|    2 |
|    3 |
|    4 |
|    5 |
|    6 |
|    7 |
|    8 |
|    9 |
|   10 |
+------+
10 rows in set (0,00 sec)

How to get file size in Java

Did a quick google. Seems that to find the file size you do this,

long size = f.length();

The differences between the three methods you posted can be found here

getFreeSpace() and getTotalSpace() are pretty self explanatory, getUsableSpace() seems to be the space that the JVM can use, which in most cases will be the same as the amount of free space.

Checking out Git tag leads to "detached HEAD state"

Okay, first a few terms slightly oversimplified.

In git, a tag (like many other things) is what's called a treeish. It's a way of referring to a point in in the history of the project. Treeishes can be a tag, a commit, a date specifier, an ordinal specifier or many other things.

Now a branch is just like a tag but is movable. When you are "on" a branch and make a commit, the branch is moved to the new commit you made indicating it's current position.

Your HEAD is pointer to a branch which is considered "current". Usually when you clone a repository, HEAD will point to master which in turn will point to a commit. When you then do something like git checkout experimental, you switch the HEAD to point to the experimental branch which might point to a different commit.

Now the explanation.

When you do a git checkout v2.0, you are switching to a commit that is not pointed to by a branch. The HEAD is now "detached" and not pointing to a branch. If you decide to make a commit now (as you may), there's no branch pointer to update to track this commit. Switching back to another commit will make you lose this new commit you've made. That's what the message is telling you.

Usually, what you can do is to say git checkout -b v2.0-fixes v2.0. This will create a new branch pointer at the commit pointed to by the treeish v2.0 (a tag in this case) and then shift your HEAD to point to that. Now, if you make commits, it will be possible to track them (using the v2.0-fixes branch) and you can work like you usually would. There's nothing "wrong" with what you've done especially if you just want to take a look at the v2.0 code. If however, you want to make any alterations there which you want to track, you'll need a branch.

You should spend some time understanding the whole DAG model of git. It's surprisingly simple and makes all the commands quite clear.

Div 100% height works on Firefox but not in IE

I've been successful in getting this to work when I set the margins of the container to 0:

#container
{
   margin: 0 px;
}

in addition to all your other styles

How to check if the request is an AJAX request with PHP

From PHP 7 with null coalescing operator it will be shorter:

$is_ajax = 'xmlhttprequest' == strtolower( $_SERVER['HTTP_X_REQUESTED_WITH'] ?? '' );

Write a formula in an Excel Cell using VBA

You can try using FormulaLocal property instead of Formula. Then the semicolon should work.

Length of array in function argument

The array decays to a pointer when passed.

Section 6.4 of the C FAQ covers this very well and provides the K&R references etc.


That aside, imagine it were possible for the function to know the size of the memory allocated in a pointer. You could call the function two or more times, each time with different input arrays that were potentially different lengths; the length would therefore have to be passed in as a secret hidden variable somehow. And then consider if you passed in an offset into another array, or an array allocated on the heap (malloc and all being library functions - something the compiler links to, rather than sees and reasons about the body of).

Its getting difficult to imagine how this might work without some behind-the-scenes slice objects and such right?


Symbian did have a AllocSize() function that returned the size of an allocation with malloc(); this only worked for the literal pointer returned by the malloc, and you'd get gobbledygook or a crash if you asked it to know the size of an invalid pointer or a pointer offset from one.

You don't want to believe its not possible, but it genuinely isn't. The only way to know the length of something passed into a function is to track the length yourself and pass it in yourself as a separate explicit parameter.

Python float to int conversion

>>> x = 2.51
>>> x*100
250.99999999999997

the floating point numbers are inaccurate. in this case, it is 250.99999999999999, which is really close to 251, but int() truncates the decimal part, in this case 250.

you should take a look at the Decimal module or maybe if you have to do a lot of calculation at the mpmath library http://code.google.com/p/mpmath/ :),

Sorting options elements alphabetically using jQuery

I know this topic is old but I think my answer can be useful for a lot of people.

Here is jQuery plugin made from Pointy's answer using ES6:

/**
 * Sort values alphabetically in select
 * source: http://stackoverflow.com/questions/12073270/sorting-options-elements-alphabetically-using-jquery
 */
$.fn.extend({
    sortSelect() {
        let options = this.find("option"),
            arr = options.map(function(_, o) { return { t: $(o).text(), v: o.value }; }).get();

        arr.sort((o1, o2) => { // sort select
            let t1 = o1.t.toLowerCase(), 
                t2 = o2.t.toLowerCase();
            return t1 > t2 ? 1 : t1 < t2 ? -1 : 0;
        });

        options.each((i, o) => {
            o.value = arr[i].v;
            $(o).text(arr[i].t);
        });
    }
});

Use is very easy

$("select").sortSelect();

Getting MAC Address

Python 2.5 includes an uuid implementation which (in at least one version) needs the mac address. You can import the mac finding function into your own code easily:

from uuid import getnode as get_mac
mac = get_mac()

The return value is the mac address as 48 bit integer.

Go To Definition: "Cannot navigate to the symbol under the caret."

Most of the paths submitted by others either don't work or are a little backwards.

Empty this folder:

%localappdata%\Temp\TFSTemp

This worked for me.

Deep copy in ES6 using the spread syntax

Instead use this for deep copy

var newObject = JSON.parse(JSON.stringify(oldObject))

_x000D_
_x000D_
var oldObject = {_x000D_
  name: 'A',_x000D_
  address: {_x000D_
    street: 'Station Road',_x000D_
    city: 'Pune'_x000D_
  }_x000D_
}_x000D_
var newObject = JSON.parse(JSON.stringify(oldObject));_x000D_
_x000D_
newObject.address.city = 'Delhi';_x000D_
console.log('newObject');_x000D_
console.log(newObject);_x000D_
console.log('oldObject');_x000D_
console.log(oldObject);
_x000D_
_x000D_
_x000D_

ReactJs: What should the PropTypes be for this.props.children?

The PropTypes documentation has the following

// Anything that can be rendered: numbers, strings, elements or an array
// (or fragment) containing these types.
optionalNode: PropTypes.node,

So, you can use PropTypes.node to check for objects or arrays of objects

static propTypes = {
   children: PropTypes.node.isRequired,
}

How to adjust text font size to fit textview

This should be a simple solution:

public void correctWidth(TextView textView, int desiredWidth)
{
    Paint paint = new Paint();
    Rect bounds = new Rect();

    paint.setTypeface(textView.getTypeface());
    float textSize = textView.getTextSize();
    paint.setTextSize(textSize);
    String text = textView.getText().toString();
    paint.getTextBounds(text, 0, text.length(), bounds);

    while (bounds.width() > desiredWidth)
    {
        textSize--;
        paint.setTextSize(textSize);
        paint.getTextBounds(text, 0, text.length(), bounds);
    }

    textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, textSize);
}

Override default Spring-Boot application.properties settings in Junit Test

If you're using Spring 5.2.5 and Spring Boot 2.2.6 and want to override just a few properties instead of the whole file. You can use the new annotation: @DynamicPropertySource

@SpringBootTest
@Testcontainers
class ExampleIntegrationTests {

    @Container
    static Neo4jContainer<?> neo4j = new Neo4jContainer<>();

    @DynamicPropertySource
    static void neo4jProperties(DynamicPropertyRegistry registry) {
        registry.add("spring.data.neo4j.uri", neo4j::getBoltUrl);
    }
}

How do I setup the dotenv file in Node.js?

If you are facing this problem it could be that the environment variable(s) is added/loaded after the file that requires the specific variable

const express = require('express');

const app = express();
const mongoose = require('mongoose');
const dotenv = require('dotenv');
const morgan = require('morgan');

const passport = require('passport'); //you want to use process.env.JWT_SECRET (you will get undefined)

dotenv.config();

in the above case, you will get undefined for the process.env.JWT_SECRET

So the solution is that you put dotenv.config() before const passport = require('passport');

const express = require('express');

const app = express();
const mongoose = require('mongoose');
const dotenv = require('dotenv');
const morgan = require('morgan');
dotenv.config();   
const passport = require('passport'); //you want to use process.env.JWT_SECRET (you will get the value for the enviroment variable)

How to get margin value of a div in plain JavaScript?

I found something very useful on this site when I was searching for an answer on this question. You can check it out at http://www.codingforums.com/javascript-programming/230503-how-get-margin-left-value.html. The part that helped me was the following:

_x000D_
_x000D_
/***
 * get live runtime value of an element's css style
 *   http://robertnyman.com/2006/04/24/get-the-rendered-style-of-an-element
 *     note: "styleName" is in CSS form (i.e. 'font-size', not 'fontSize').
 ***/
var getStyle = function(e, styleName) {
  var styleValue = "";
  if (document.defaultView && document.defaultView.getComputedStyle) {
    styleValue = document.defaultView.getComputedStyle(e, "").getPropertyValue(styleName);
  } else if (e.currentStyle) {
    styleName = styleName.replace(/\-(\w)/g, function(strMatch, p1) {
      return p1.toUpperCase();
    });
    styleValue = e.currentStyle[styleName];
  }
  return styleValue;
}
////////////////////////////////////
var e = document.getElementById('yourElement');
var marLeft = getStyle(e, 'margin-left');
console.log(marLeft);    // 10px
_x000D_
#yourElement {
  margin-left: 10px;
}
_x000D_
<div id="yourElement"></div>
_x000D_
_x000D_
_x000D_

Angular 4 - get input value

You can use (keyup) or (change) events, see example below:

in HTML:

<input (keyup)="change($event)">

Or

<input (change)="change($event)">

in Component:

change(event) {console.log(event.target.value);}

Activating Anaconda Environment in VsCode

As I was not able to solve my problem by suggested ways, I will share how I fixed it.

First of all, even if I was able to activate an environment, the corresponding environment folder was not present in C:\ProgramData\Anaconda3\envs directory.

So I created a new anaconda environment using Anaconda prompt, a new folder named same as your given environment name will be created in the envs folder.

Next, I activated that environment in Anaconda prompt. Installed python with conda install python command.

Then on anaconda navigator, selected the newly created environment in the 'Applications on' menu. Launched vscode through Anaconda navigator.

Now as suggested by other answers, in vscode, opened command palette with Ctrl + Shift + P keyboard shortcut. Searched and selected Python: Select Interpreter

If the interpreter with newly created environment isn't listed out there, select Enter Interpreter Path and choose the newly created python.exe which is located similar to C:\ProgramData\Anaconda3\envs\<your-new-env>\ . So the total path will look like C:\ProgramData\Anaconda3\envs\<your-nev-env>\python.exe

Next time onwards the interpreter will be automatically listed among other interpreters.

Now you might see your selected conda environment at bottom left side in vscode.

Android : Check whether the phone is dual SIM

Tips:

You can try to use

ctx.getSystemService("phone_msim")

instead of

ctx.getSystemService(Context.TELEPHONY_SERVICE)

If you have already tried Vaibhav's answer and telephony.getClass().getMethod() fails, above is what works for my Qualcomm mobile.

'Class' does not contain a definition for 'Method'

If you are using a class from another project, the project needs to re-build and create re-the dll. Make sure "Build" is checked for that project on Build -> Configuration Manager in Visual Studio. So the reference project will re-build and update the dll.

Python: List vs Dict for look up table

Speed

Lookups in lists are O(n), lookups in dictionaries are amortized O(1), with regard to the number of items in the data structure. If you don't need to associate values, use sets.

Memory

Both dictionaries and sets use hashing and they use much more memory than only for object storage. According to A.M. Kuchling in Beautiful Code, the implementation tries to keep the hash 2/3 full, so you might waste quite some memory.

If you do not add new entries on the fly (which you do, based on your updated question), it might be worthwhile to sort the list and use binary search. This is O(log n), and is likely to be slower for strings, impossible for objects which do not have a natural ordering.

Javascript change date into format of (dd/mm/yyyy)

This will ensure you get a two-digit day and month.

function formattedDate(d = new Date) {
  let month = String(d.getMonth() + 1);
  let day = String(d.getDate());
  const year = String(d.getFullYear());

  if (month.length < 2) month = '0' + month;
  if (day.length < 2) day = '0' + day;

  return `${day}/${month}/${year}`;
}

Or terser:

function formattedDate(d = new Date) {
  return [d.getDate(), d.getMonth()+1, d.getFullYear()]
      .map(n => n < 10 ? `0${n}` : `${n}`).join('/');
}

How to avoid "ConcurrentModificationException" while removing elements from `ArrayList` while iterating it?

You have to use the iterator's remove() method, which means no enhanced for loop:

for (final Iterator iterator = myArrayList.iterator(); iterator.hasNext(); ) {
    iterator.next();
    if (someCondition) {
        iterator.remove();
    }
}

Add a column in a table in HIVE QL

You cannot add a column with a default value in Hive. You have the right syntax for adding the column ALTER TABLE test1 ADD COLUMNS (access_count1 int);, you just need to get rid of default sum(max_count). No changes to that files backing your table will happen as a result of adding the column. Hive handles the "missing" data by interpreting NULL as the value for every cell in that column.

So now your have the problem of needing to populate the column. Unfortunately in Hive you essentially need to rewrite the whole table, this time with the column populated. It may be easier to rerun your original query with the new column. Or you could add the column to the table you have now, then select all of its columns plus value for the new column.

You also have the option to always COALESCE the column to your desired default and leave it NULL for now. This option fails when you want NULL to have a meaning distinct from your desired default. It also requires you to depend on always remembering to COALESCE.

If you are very confident in your abilities to deal with the files backing Hive, you could also directly alter them to add your default. In general I would recommend against this because most of the time it will be slower and more dangerous. There might be some case where it makes sense though, so I've included this option for completeness.

SASS :not selector

I tried re-creating this, and .someclass.notip was being generated for me but .someclass:not(.notip) was not, for as long as I did not have the @mixin tip() defined. Once I had that, it all worked.

http://sassmeister.com/gist/9775949

$dropdown-width: 100px;
$comp-tip: true;

@mixin tip($pos:right) {

}

@mixin dropdown-pos($pos:right) {
  &:not(.notip) {
    @if $comp-tip == true{
      @if $pos == right {
        top:$dropdown-width * -0.6;
        background-color: #f00;
        @include tip($pos:$pos);
      }
    }
  }
  &.notip {
    @if $pos == right {
      top: 0;
      left:$dropdown-width * 0.8;
      background-color: #00f;
    }
  }
}

.someclass { @include dropdown-pos(); }

EDIT: http://sassmeister.com/ is a good place to debug your SASS because it gives you error messages. Undefined mixin 'tip'. it what I get when I remove @mixin tip($pos:right) { }

Delete specific values from column with where condition?

You can also use REPLACE():

UPDATE Table
   SET Column = REPLACE(Column, 'Test123', 'Test')

How to upgrade Angular CLI project?

Remove :

npm uninstall -g angular-cli

Reinstall (with yarn)

# npm install --global yarn
yarn global add @angular/cli@latest
ng set --global packageManager=yarn  # This will help ng-cli to use yarn

Reinstall (with npm)

npm install --global @angular/cli@latest

Another way is to not use global install, and add /node_modules/.bin folder in the PATH, or use npm scripts. It will be softer to upgrade.

NSURLConnection Using iOS Swift

Swift 3.0

AsynchonousRequest

let urlString = "http://heyhttp.org/me.json"
var request = URLRequest(url: URL(string: urlString)!)
let session = URLSession.shared

session.dataTask(with: request) {data, response, error in
  if error != nil {
    print(error!.localizedDescription)
    return
  }

  do {
    let jsonResult: NSDictionary? = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary
    print("Synchronous\(jsonResult)")
  } catch {
    print(error.localizedDescription)
  }
}.resume()

disable all form elements inside div

Use the CSS Class to prevent from Editing the Div Elements

CSS:

.divoverlay
{
position:absolute;
width:100%;
height:100%;
background-color:transparent;
z-index:1;
top:0;
}

JS:

$('#divName').append('<div class=divoverlay></div>');

Or add the class name in HTML Tag. It will prevent from editing the Div Elements.

What are the best practices for using a GUID as a primary key, specifically regarding performance?

Most of the times it should not be used as the primary key for a table because it really hit the performance of the database. useful links regarding GUID impact on performance and as a primary key.

  1. https://www.sqlskills.com/blogs/kimberly/disk-space-is-cheap/
  2. https://www.sqlskills.com/blogs/kimberly/guids-as-primary-keys-andor-the-clustering-key/

Defining lists as global variables in Python

Yes, you need to use global foo if you are going to write to it.

foo = []

def bar():
    global foo
    ...
    foo = [1]

Measuring elapsed time with the Time module

For the best measure of elapsed time (since Python 3.3), use time.perf_counter().

Return the value (in fractional seconds) of a performance counter, i.e. a clock with the highest available resolution to measure a short duration. It does include time elapsed during sleep and is system-wide. The reference point of the returned value is undefined, so that only the difference between the results of consecutive calls is valid.

For measurements on the order of hours/days, you don't care about sub-second resolution so use time.monotonic() instead.

Return the value (in fractional seconds) of a monotonic clock, i.e. a clock that cannot go backwards. The clock is not affected by system clock updates. The reference point of the returned value is undefined, so that only the difference between the results of consecutive calls is valid.

In many implementations, these may actually be the same thing.

Before 3.3, you're stuck with time.clock().

On Unix, return the current processor time as a floating point number expressed in seconds. The precision, and in fact the very definition of the meaning of “processor time”, depends on that of the C function of the same name.

On Windows, this function returns wall-clock seconds elapsed since the first call to this function, as a floating point number, based on the Win32 function QueryPerformanceCounter(). The resolution is typically better than one microsecond.


Update for Python 3.7

New in Python 3.7 is PEP 564 -- Add new time functions with nanosecond resolution.

Use of these can further eliminate rounding and floating-point errors, especially if you're measuring very short periods, or your application (or Windows machine) is long-running.

Resolution starts breaking down on perf_counter() after around 100 days. So for example after a year of uptime, the shortest interval (greater than 0) it can measure will be bigger than when it started.


Update for Python 3.8

time.clock is now gone.

What is Vim recording and how can it be disabled?

You start recording by q<letter> and you can end it by typing q again.

Recording is a really useful feature of Vim.

It records everything you type. You can then replay it simply by typing @<letter>. Record search, movement, replacement...

One of the best feature of Vim IMHO.

How to remove element from array in forEach loop?

I understood that you want to remove from the array using a condition and have another array that has items removed from the array. Is right?

How about this?

_x000D_
_x000D_
var review = ['a', 'b', 'c', 'ab', 'bc'];_x000D_
var filtered = [];_x000D_
for(var i=0; i < review.length;) {_x000D_
  if(review[i].charAt(0) == 'a') {_x000D_
    filtered.push(review.splice(i,1)[0]);_x000D_
  }else{_x000D_
    i++;_x000D_
  }_x000D_
}_x000D_
_x000D_
console.log("review", review);_x000D_
console.log("filtered", filtered);
_x000D_
_x000D_
_x000D_

Hope this help...

By the way, I compared 'for-loop' to 'forEach'.

If remove in case a string contains 'f', a result is different.

_x000D_
_x000D_
var review = ["of", "concat", "copyWithin", "entries", "every", "fill", "filter", "find", "findIndex", "flatMap", "flatten", "forEach", "includes", "indexOf", "join", "keys", "lastIndexOf", "map", "pop", "push", "reduce", "reduceRight", "reverse", "shift", "slice", "some", "sort", "splice", "toLocaleString", "toSource", "toString", "unshift", "values"];_x000D_
var filtered = [];_x000D_
for(var i=0; i < review.length;) {_x000D_
  if( review[i].includes('f')) {_x000D_
    filtered.push(review.splice(i,1)[0]);_x000D_
  }else {_x000D_
    i++;_x000D_
  }_x000D_
}_x000D_
console.log("review", review);_x000D_
console.log("filtered", filtered);_x000D_
/**_x000D_
 * review [  "concat",  "copyWithin",  "entries",  "every",  "includes",  "join",  "keys",  "map",  "pop",  "push",  "reduce",  "reduceRight",  "reverse",  "slice",  "some",  "sort",  "splice",  "toLocaleString",  "toSource",  "toString",  "values"] _x000D_
 */_x000D_
_x000D_
console.log("========================================================");_x000D_
review = ["of", "concat", "copyWithin", "entries", "every", "fill", "filter", "find", "findIndex", "flatMap", "flatten", "forEach", "includes", "indexOf", "join", "keys", "lastIndexOf", "map", "pop", "push", "reduce", "reduceRight", "reverse", "shift", "slice", "some", "sort", "splice", "toLocaleString", "toSource", "toString", "unshift", "values"];_x000D_
filtered = [];_x000D_
_x000D_
review.forEach(function(item,i, object) {_x000D_
  if( item.includes('f')) {_x000D_
    filtered.push(object.splice(i,1)[0]);_x000D_
  }_x000D_
});_x000D_
_x000D_
console.log("-----------------------------------------");_x000D_
console.log("review", review);_x000D_
console.log("filtered", filtered);_x000D_
_x000D_
/**_x000D_
 * review [  "concat",  "copyWithin",  "entries",  "every",  "filter",  "findIndex",  "flatten",  "includes",  "join",  "keys",  "map",  "pop",  "push",  "reduce",  "reduceRight",  "reverse",  "slice",  "some",  "sort",  "splice",  "toLocaleString",  "toSource",  "toString",  "values"]_x000D_
 */
_x000D_
_x000D_
_x000D_

And remove by each iteration, also a result is different.

_x000D_
_x000D_
var review = ["of", "concat", "copyWithin", "entries", "every", "fill", "filter", "find", "findIndex", "flatMap", "flatten", "forEach", "includes", "indexOf", "join", "keys", "lastIndexOf", "map", "pop", "push", "reduce", "reduceRight", "reverse", "shift", "slice", "some", "sort", "splice", "toLocaleString", "toSource", "toString", "unshift", "values"];_x000D_
var filtered = [];_x000D_
for(var i=0; i < review.length;) {_x000D_
  filtered.push(review.splice(i,1)[0]);_x000D_
}_x000D_
console.log("review", review);_x000D_
console.log("filtered", filtered);_x000D_
console.log("========================================================");_x000D_
review = ["of", "concat", "copyWithin", "entries", "every", "fill", "filter", "find", "findIndex", "flatMap", "flatten", "forEach", "includes", "indexOf", "join", "keys", "lastIndexOf", "map", "pop", "push", "reduce", "reduceRight", "reverse", "shift", "slice", "some", "sort", "splice", "toLocaleString", "toSource", "toString", "unshift", "values"];_x000D_
filtered = [];_x000D_
_x000D_
review.forEach(function(item,i, object) {_x000D_
  filtered.push(object.splice(i,1)[0]);_x000D_
});_x000D_
_x000D_
console.log("-----------------------------------------");_x000D_
console.log("review", review);_x000D_
console.log("filtered", filtered);
_x000D_
_x000D_
_x000D_

How do I flush the cin buffer?

The following should work:

cin.flush();

On some systems it's not available and then you can use:

cin.ignore(INT_MAX);

With form validation: why onsubmit="return functionname()" instead of onsubmit="functionname()"?

When onsubmit (or any other event) is supplied as an HTML attribute, the string value of the attribute (e.g. "return validate();") is injected as the body of the actual onsubmit handler function when the DOM object is created for the element.

Here's a brief proof in the browser console:

var p = document.createElement('p');
p.innerHTML = '<form onsubmit="return validate(); // my statement"></form>';
var form = p.childNodes[0];

console.log(typeof form.onsubmit);
// => function

console.log(form.onsubmit.toString());
// => function onsubmit(event) {
//      return validate(); // my statement
//    }

So in case the return keyword is supplied in the injected statement; when the submit handler is triggered the return value received from validate function call will be passed over as the return value of the submit handler and thus take effect on controlling the submit behavior of the form.

Without the supplied return in the string, the generated onsubmit handler would not have an explicit return statement and when triggered it would return undefined (the default function return value) irrespective of whether validate() returns true or false and the form would be submitted in both cases.

How to convert from []byte to int in Go Programming

If []byte is ASCII byte numbers then first convert the []byte to string and use the strconv package Atoi method which convert string to int.

package main
import (
    "fmt"
    "strconv"
)

func main() {
    byteNumber := []byte("14")
    byteToInt, _ := strconv.Atoi(string(byteNumber))
    fmt.Println(byteToInt)
}

go playground - https://play.golang.org/p/gEzxva8-BGP

Checking for empty or null List<string>

Checkout L-Four's answer.

A less-efficient answer:

if(myList.Count == 0){
    // nothing is there. Add here
}

Basically new List<T> will not be null but will have no elements. As is noted in the comments, the above will throw an exception if the list is uninstantiated. But as for the snippet in the question, where it is instantiated, the above will work just fine.

If you need to check for null, then it would be:

if(myList != null && myList.Count == 0){
  // The list is empty. Add something here
}

Even better would be to use !myList.Any() and as is mentioned in the aforementioned L-Four's answer as short circuiting is faster than linear counting of the elements in the list.

Looping over a list in Python

Do this instead:

values = [[1,2,3],[4,5]]
for x in values:
    if len(x) == 3:
       print(x)

What's the best mock framework for Java?

The best solution to mocking is to have the machine do all the work with automated specification-based testing. For Java, see ScalaCheck and the Reductio framework included in the Functional Java library. With automated specification-based testing frameworks, you supply a specification of the method under test (a property about it that should be true) and the framework generates tests as well as mock objects, automatically.

For example, the following property tests the Math.sqrt method to see if the square root of any positive number n squared is equal to n.

val propSqrt = forAll { (n: Int) => (n >= 0) ==> scala.Math.sqrt(n*n) == n }

When you call propSqrt.check(), ScalaCheck generates hundreds of integers and checks your property for each, also automatically making sure that the edge cases are covered well.

Even though ScalaCheck is written in Scala, and requires the Scala Compiler, it's easy to test Java code with it. The Reductio framework in Functional Java is a pure Java implementation of the same concepts.

Calling a function within a Class method?

Try this one:

class test {
     public function newTest(){
          $this->bigTest();
          $this->smallTest();
     }

     private function bigTest(){
          //Big Test Here
     }

     private function smallTest(){
          //Small Test Here
     }

     public function scoreTest(){
          //Scoring code here;
     }
}

$testObject = new test();

$testObject->newTest();

$testObject->scoreTest();